diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ext4/super.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ext4/super.c | 4980 |
1 files changed, 0 insertions, 4980 deletions
diff --git a/ANDROID_3.4.5/fs/ext4/super.c b/ANDROID_3.4.5/fs/ext4/super.c deleted file mode 100644 index a68703a5..00000000 --- a/ANDROID_3.4.5/fs/ext4/super.c +++ /dev/null @@ -1,4980 +0,0 @@ -/* - * linux/fs/ext4/super.c - * - * Copyright (C) 1992, 1993, 1994, 1995 - * Remy Card (card@masi.ibp.fr) - * Laboratoire MASI - Institut Blaise Pascal - * Universite Pierre et Marie Curie (Paris VI) - * - * from - * - * linux/fs/minix/inode.c - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * Big-endian to little-endian byte-swapping/bitmaps by - * David S. Miller (davem@caip.rutgers.edu), 1995 - */ - -#include <linux/module.h> -#include <linux/string.h> -#include <linux/fs.h> -#include <linux/time.h> -#include <linux/vmalloc.h> -#include <linux/jbd2.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/blkdev.h> -#include <linux/parser.h> -#include <linux/buffer_head.h> -#include <linux/exportfs.h> -#include <linux/vfs.h> -#include <linux/random.h> -#include <linux/mount.h> -#include <linux/namei.h> -#include <linux/quotaops.h> -#include <linux/seq_file.h> -#include <linux/proc_fs.h> -#include <linux/ctype.h> -#include <linux/log2.h> -#include <linux/crc16.h> -#include <linux/cleancache.h> -#include <asm/uaccess.h> - -#include <linux/kthread.h> -#include <linux/freezer.h> - -#include "ext4.h" -#include "ext4_extents.h" -#include "ext4_jbd2.h" -#include "xattr.h" -#include "acl.h" -#include "mballoc.h" - -#define CREATE_TRACE_POINTS -#include <trace/events/ext4.h> - -static struct proc_dir_entry *ext4_proc_root; -static struct kset *ext4_kset; -static struct ext4_lazy_init *ext4_li_info; -static struct mutex ext4_li_mtx; -static struct ext4_features *ext4_feat; - -static int ext4_load_journal(struct super_block *, struct ext4_super_block *, - unsigned long journal_devnum); -static int ext4_show_options(struct seq_file *seq, struct dentry *root); -static int ext4_commit_super(struct super_block *sb, int sync); -static void ext4_mark_recovery_complete(struct super_block *sb, - struct ext4_super_block *es); -static void ext4_clear_journal_err(struct super_block *sb, - struct ext4_super_block *es); -static int ext4_sync_fs(struct super_block *sb, int wait); -static const char *ext4_decode_error(struct super_block *sb, int errno, - char nbuf[16]); -static int ext4_remount(struct super_block *sb, int *flags, char *data); -static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); -static int ext4_unfreeze(struct super_block *sb); -static void ext4_write_super(struct super_block *sb); -static int ext4_freeze(struct super_block *sb); -static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data); -static inline int ext2_feature_set_ok(struct super_block *sb); -static inline int ext3_feature_set_ok(struct super_block *sb); -static int ext4_feature_set_ok(struct super_block *sb, int readonly); -static void ext4_destroy_lazyinit_thread(void); -static void ext4_unregister_li_request(struct super_block *sb); -static void ext4_clear_request_list(void); - -#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) -static struct file_system_type ext2_fs_type = { - .owner = THIS_MODULE, - .name = "ext2", - .mount = ext4_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; -#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) -#else -#define IS_EXT2_SB(sb) (0) -#endif - - -#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) -static struct file_system_type ext3_fs_type = { - .owner = THIS_MODULE, - .name = "ext3", - .mount = ext4_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; -#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) -#else -#define IS_EXT3_SB(sb) (0) -#endif - -void *ext4_kvmalloc(size_t size, gfp_t flags) -{ - void *ret; - - ret = kmalloc(size, flags); - if (!ret) - ret = __vmalloc(size, flags, PAGE_KERNEL); - return ret; -} - -void *ext4_kvzalloc(size_t size, gfp_t flags) -{ - void *ret; - - ret = kzalloc(size, flags); - if (!ret) - ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); - return ret; -} - -void ext4_kvfree(void *ptr) -{ - if (is_vmalloc_addr(ptr)) - vfree(ptr); - else - kfree(ptr); - -} - -ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le32_to_cpu(bg->bg_block_bitmap_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); -} - -ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le32_to_cpu(bg->bg_inode_bitmap_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); -} - -ext4_fsblk_t ext4_inode_table(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le32_to_cpu(bg->bg_inode_table_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); -} - -__u32 ext4_free_group_clusters(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le16_to_cpu(bg->bg_free_blocks_count_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); -} - -__u32 ext4_free_inodes_count(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le16_to_cpu(bg->bg_free_inodes_count_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); -} - -__u32 ext4_used_dirs_count(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le16_to_cpu(bg->bg_used_dirs_count_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); -} - -__u32 ext4_itable_unused_count(struct super_block *sb, - struct ext4_group_desc *bg) -{ - return le16_to_cpu(bg->bg_itable_unused_lo) | - (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? - (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); -} - -void ext4_block_bitmap_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk) -{ - bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); -} - -void ext4_inode_bitmap_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk) -{ - bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); -} - -void ext4_inode_table_set(struct super_block *sb, - struct ext4_group_desc *bg, ext4_fsblk_t blk) -{ - bg->bg_inode_table_lo = cpu_to_le32((u32)blk); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); -} - -void ext4_free_group_clusters_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count) -{ - bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); -} - -void ext4_free_inodes_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count) -{ - bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); -} - -void ext4_used_dirs_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count) -{ - bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); -} - -void ext4_itable_unused_set(struct super_block *sb, - struct ext4_group_desc *bg, __u32 count) -{ - bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); - if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) - bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); -} - - -/* Just increment the non-pointer handle value */ -static handle_t *ext4_get_nojournal(void) -{ - handle_t *handle = current->journal_info; - unsigned long ref_cnt = (unsigned long)handle; - - BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); - - ref_cnt++; - handle = (handle_t *)ref_cnt; - - current->journal_info = handle; - return handle; -} - - -/* Decrement the non-pointer handle value */ -static void ext4_put_nojournal(handle_t *handle) -{ - unsigned long ref_cnt = (unsigned long)handle; - - BUG_ON(ref_cnt == 0); - - ref_cnt--; - handle = (handle_t *)ref_cnt; - - current->journal_info = handle; -} - -/* - * Wrappers for jbd2_journal_start/end. - * - * The only special thing we need to do here is to make sure that all - * journal_end calls result in the superblock being marked dirty, so - * that sync() will call the filesystem's write_super callback if - * appropriate. - * - * To avoid j_barrier hold in userspace when a user calls freeze(), - * ext4 prevents a new handle from being started by s_frozen, which - * is in an upper layer. - */ -handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) -{ - journal_t *journal; - handle_t *handle; - - trace_ext4_journal_start(sb, nblocks, _RET_IP_); - if (sb->s_flags & MS_RDONLY) - return ERR_PTR(-EROFS); - - journal = EXT4_SB(sb)->s_journal; - handle = ext4_journal_current_handle(); - - /* - * If a handle has been started, it should be allowed to - * finish, otherwise deadlock could happen between freeze - * and others(e.g. truncate) due to the restart of the - * journal handle if the filesystem is forzen and active - * handles are not stopped. - */ - if (!handle) - vfs_check_frozen(sb, SB_FREEZE_TRANS); - - if (!journal) - return ext4_get_nojournal(); - /* - * Special case here: if the journal has aborted behind our - * backs (eg. EIO in the commit thread), then we still need to - * take the FS itself readonly cleanly. - */ - if (is_journal_aborted(journal)) { - ext4_abort(sb, "Detected aborted journal"); - return ERR_PTR(-EROFS); - } - return jbd2_journal_start(journal, nblocks); -} - -/* - * The only special thing we need to do here is to make sure that all - * jbd2_journal_stop calls result in the superblock being marked dirty, so - * that sync() will call the filesystem's write_super callback if - * appropriate. - */ -int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) -{ - struct super_block *sb; - int err; - int rc; - - if (!ext4_handle_valid(handle)) { - ext4_put_nojournal(handle); - return 0; - } - sb = handle->h_transaction->t_journal->j_private; - err = handle->h_err; - rc = jbd2_journal_stop(handle); - - if (!err) - err = rc; - if (err) - __ext4_std_error(sb, where, line, err); - return err; -} - -void ext4_journal_abort_handle(const char *caller, unsigned int line, - const char *err_fn, struct buffer_head *bh, - handle_t *handle, int err) -{ - char nbuf[16]; - const char *errstr = ext4_decode_error(NULL, err, nbuf); - - BUG_ON(!ext4_handle_valid(handle)); - - if (bh) - BUFFER_TRACE(bh, "abort"); - - if (!handle->h_err) - handle->h_err = err; - - if (is_handle_aborted(handle)) - return; - - printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n", - caller, line, errstr, err_fn); - - jbd2_journal_abort_handle(handle); -} - -static void __save_error_info(struct super_block *sb, const char *func, - unsigned int line) -{ - struct ext4_super_block *es = EXT4_SB(sb)->s_es; - - EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; - es->s_state |= cpu_to_le16(EXT4_ERROR_FS); - es->s_last_error_time = cpu_to_le32(get_seconds()); - strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); - es->s_last_error_line = cpu_to_le32(line); - if (!es->s_first_error_time) { - es->s_first_error_time = es->s_last_error_time; - strncpy(es->s_first_error_func, func, - sizeof(es->s_first_error_func)); - es->s_first_error_line = cpu_to_le32(line); - es->s_first_error_ino = es->s_last_error_ino; - es->s_first_error_block = es->s_last_error_block; - } - /* - * Start the daily error reporting function if it hasn't been - * started already - */ - if (!es->s_error_count) - mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); - es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); -} - -static void save_error_info(struct super_block *sb, const char *func, - unsigned int line) -{ - __save_error_info(sb, func, line); - ext4_commit_super(sb, 1); -} - -/* - * The del_gendisk() function uninitializes the disk-specific data - * structures, including the bdi structure, without telling anyone - * else. Once this happens, any attempt to call mark_buffer_dirty() - * (for example, by ext4_commit_super), will cause a kernel OOPS. - * This is a kludge to prevent these oops until we can put in a proper - * hook in del_gendisk() to inform the VFS and file system layers. - */ -static int block_device_ejected(struct super_block *sb) -{ - struct inode *bd_inode = sb->s_bdev->bd_inode; - struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; - - return bdi->dev == NULL; -} - -static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) -{ - struct super_block *sb = journal->j_private; - struct ext4_sb_info *sbi = EXT4_SB(sb); - int error = is_journal_aborted(journal); - struct ext4_journal_cb_entry *jce, *tmp; - - spin_lock(&sbi->s_md_lock); - list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) { - list_del_init(&jce->jce_list); - spin_unlock(&sbi->s_md_lock); - jce->jce_func(sb, jce, error); - spin_lock(&sbi->s_md_lock); - } - spin_unlock(&sbi->s_md_lock); -} - -/* Deal with the reporting of failure conditions on a filesystem such as - * inconsistencies detected or read IO failures. - * - * On ext2, we can store the error state of the filesystem in the - * superblock. That is not possible on ext4, because we may have other - * write ordering constraints on the superblock which prevent us from - * writing it out straight away; and given that the journal is about to - * be aborted, we can't rely on the current, or future, transactions to - * write out the superblock safely. - * - * We'll just use the jbd2_journal_abort() error code to record an error in - * the journal instead. On recovery, the journal will complain about - * that error until we've noted it down and cleared it. - */ - -static void ext4_handle_error(struct super_block *sb) -{ - if (sb->s_flags & MS_RDONLY) - return; - - if (!test_opt(sb, ERRORS_CONT)) { - journal_t *journal = EXT4_SB(sb)->s_journal; - - EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; - if (journal) - jbd2_journal_abort(journal, -EIO); - } - if (test_opt(sb, ERRORS_RO)) { - ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); - sb->s_flags |= MS_RDONLY; - } - if (test_opt(sb, ERRORS_PANIC)) - panic("EXT4-fs (device %s): panic forced after error\n", - sb->s_id); -} - -void __ext4_error(struct super_block *sb, const char *function, - unsigned int line, const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", - sb->s_id, function, line, current->comm, &vaf); - va_end(args); - save_error_info(sb, function, line); - - ext4_handle_error(sb); -} - -void ext4_error_inode(struct inode *inode, const char *function, - unsigned int line, ext4_fsblk_t block, - const char *fmt, ...) -{ - va_list args; - struct va_format vaf; - struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; - - es->s_last_error_ino = cpu_to_le32(inode->i_ino); - es->s_last_error_block = cpu_to_le64(block); - save_error_info(inode->i_sb, function, line); - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - if (block) - printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " - "inode #%lu: block %llu: comm %s: %pV\n", - inode->i_sb->s_id, function, line, inode->i_ino, - block, current->comm, &vaf); - else - printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " - "inode #%lu: comm %s: %pV\n", - inode->i_sb->s_id, function, line, inode->i_ino, - current->comm, &vaf); - va_end(args); - - ext4_handle_error(inode->i_sb); -} - -void ext4_error_file(struct file *file, const char *function, - unsigned int line, ext4_fsblk_t block, - const char *fmt, ...) -{ - va_list args; - struct va_format vaf; - struct ext4_super_block *es; - struct inode *inode = file->f_dentry->d_inode; - char pathname[80], *path; - - es = EXT4_SB(inode->i_sb)->s_es; - es->s_last_error_ino = cpu_to_le32(inode->i_ino); - save_error_info(inode->i_sb, function, line); - path = d_path(&(file->f_path), pathname, sizeof(pathname)); - if (IS_ERR(path)) - path = "(unknown)"; - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - if (block) - printk(KERN_CRIT - "EXT4-fs error (device %s): %s:%d: inode #%lu: " - "block %llu: comm %s: path %s: %pV\n", - inode->i_sb->s_id, function, line, inode->i_ino, - block, current->comm, path, &vaf); - else - printk(KERN_CRIT - "EXT4-fs error (device %s): %s:%d: inode #%lu: " - "comm %s: path %s: %pV\n", - inode->i_sb->s_id, function, line, inode->i_ino, - current->comm, path, &vaf); - va_end(args); - - ext4_handle_error(inode->i_sb); -} - -static const char *ext4_decode_error(struct super_block *sb, int errno, - char nbuf[16]) -{ - char *errstr = NULL; - - switch (errno) { - case -EIO: - errstr = "IO failure"; - break; - case -ENOMEM: - errstr = "Out of memory"; - break; - case -EROFS: - if (!sb || (EXT4_SB(sb)->s_journal && - EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) - errstr = "Journal has aborted"; - else - errstr = "Readonly filesystem"; - break; - default: - /* If the caller passed in an extra buffer for unknown - * errors, textualise them now. Else we just return - * NULL. */ - if (nbuf) { - /* Check for truncated error codes... */ - if (snprintf(nbuf, 16, "error %d", -errno) >= 0) - errstr = nbuf; - } - break; - } - - return errstr; -} - -/* __ext4_std_error decodes expected errors from journaling functions - * automatically and invokes the appropriate error response. */ - -void __ext4_std_error(struct super_block *sb, const char *function, - unsigned int line, int errno) -{ - char nbuf[16]; - const char *errstr; - - /* Special case: if the error is EROFS, and we're not already - * inside a transaction, then there's really no point in logging - * an error. */ - if (errno == -EROFS && journal_current_handle() == NULL && - (sb->s_flags & MS_RDONLY)) - return; - - errstr = ext4_decode_error(sb, errno, nbuf); - printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", - sb->s_id, function, line, errstr); - save_error_info(sb, function, line); - - ext4_handle_error(sb); -} - -/* - * ext4_abort is a much stronger failure handler than ext4_error. The - * abort function may be used to deal with unrecoverable failures such - * as journal IO errors or ENOMEM at a critical moment in log management. - * - * We unconditionally force the filesystem into an ABORT|READONLY state, - * unless the error response on the fs has been set to panic in which - * case we take the easy way out and panic immediately. - */ - -void __ext4_abort(struct super_block *sb, const char *function, - unsigned int line, const char *fmt, ...) -{ - va_list args; - - save_error_info(sb, function, line); - va_start(args, fmt); - printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, - function, line); - vprintk(fmt, args); - printk("\n"); - va_end(args); - - if ((sb->s_flags & MS_RDONLY) == 0) { - ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); - sb->s_flags |= MS_RDONLY; - EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; - if (EXT4_SB(sb)->s_journal) - jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); - save_error_info(sb, function, line); - } - if (test_opt(sb, ERRORS_PANIC)) - panic("EXT4-fs panic from previous error\n"); -} - -void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); - va_end(args); -} - -void __ext4_warning(struct super_block *sb, const char *function, - unsigned int line, const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", - sb->s_id, function, line, &vaf); - va_end(args); -} - -void __ext4_grp_locked_error(const char *function, unsigned int line, - struct super_block *sb, ext4_group_t grp, - unsigned long ino, ext4_fsblk_t block, - const char *fmt, ...) -__releases(bitlock) -__acquires(bitlock) -{ - struct va_format vaf; - va_list args; - struct ext4_super_block *es = EXT4_SB(sb)->s_es; - - es->s_last_error_ino = cpu_to_le32(ino); - es->s_last_error_block = cpu_to_le64(block); - __save_error_info(sb, function, line); - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", - sb->s_id, function, line, grp); - if (ino) - printk(KERN_CONT "inode %lu: ", ino); - if (block) - printk(KERN_CONT "block %llu:", (unsigned long long) block); - printk(KERN_CONT "%pV\n", &vaf); - va_end(args); - - if (test_opt(sb, ERRORS_CONT)) { - ext4_commit_super(sb, 0); - return; - } - - ext4_unlock_group(sb, grp); - ext4_handle_error(sb); - /* - * We only get here in the ERRORS_RO case; relocking the group - * may be dangerous, but nothing bad will happen since the - * filesystem will have already been marked read/only and the - * journal has been aborted. We return 1 as a hint to callers - * who might what to use the return value from - * ext4_grp_locked_error() to distinguish between the - * ERRORS_CONT and ERRORS_RO case, and perhaps return more - * aggressively from the ext4 function in question, with a - * more appropriate error code. - */ - ext4_lock_group(sb, grp); - return; -} - -void ext4_update_dynamic_rev(struct super_block *sb) -{ - struct ext4_super_block *es = EXT4_SB(sb)->s_es; - - if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) - return; - - ext4_warning(sb, - "updating to rev %d because of new feature flag, " - "running e2fsck is recommended", - EXT4_DYNAMIC_REV); - - es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); - es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); - es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); - /* leave es->s_feature_*compat flags alone */ - /* es->s_uuid will be set by e2fsck if empty */ - - /* - * The rest of the superblock fields should be zero, and if not it - * means they are likely already in use, so leave them alone. We - * can leave it up to e2fsck to clean up any inconsistencies there. - */ -} - -/* - * Open the external journal device - */ -static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) -{ - struct block_device *bdev; - char b[BDEVNAME_SIZE]; - - bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); - if (IS_ERR(bdev)) - goto fail; - return bdev; - -fail: - ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", - __bdevname(dev, b), PTR_ERR(bdev)); - return NULL; -} - -/* - * Release the journal device - */ -static int ext4_blkdev_put(struct block_device *bdev) -{ - return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); -} - -static int ext4_blkdev_remove(struct ext4_sb_info *sbi) -{ - struct block_device *bdev; - int ret = -ENODEV; - - bdev = sbi->journal_bdev; - if (bdev) { - ret = ext4_blkdev_put(bdev); - sbi->journal_bdev = NULL; - } - return ret; -} - -static inline struct inode *orphan_list_entry(struct list_head *l) -{ - return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; -} - -static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) -{ - struct list_head *l; - - ext4_msg(sb, KERN_ERR, "sb orphan head is %d", - le32_to_cpu(sbi->s_es->s_last_orphan)); - - printk(KERN_ERR "sb_info orphan list:\n"); - list_for_each(l, &sbi->s_orphan) { - struct inode *inode = orphan_list_entry(l); - printk(KERN_ERR " " - "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", - inode->i_sb->s_id, inode->i_ino, inode, - inode->i_mode, inode->i_nlink, - NEXT_ORPHAN(inode)); - } -} - -static void ext4_put_super(struct super_block *sb) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_super_block *es = sbi->s_es; - int i, err; - - ext4_unregister_li_request(sb); - dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); - - flush_workqueue(sbi->dio_unwritten_wq); - destroy_workqueue(sbi->dio_unwritten_wq); - - lock_super(sb); - if (sbi->s_journal) { - err = jbd2_journal_destroy(sbi->s_journal); - sbi->s_journal = NULL; - if (err < 0) - ext4_abort(sb, "Couldn't clean up the journal"); - } - - del_timer(&sbi->s_err_report); - ext4_release_system_zone(sb); - ext4_mb_release(sb); - ext4_ext_release(sb); - ext4_xattr_put_super(sb); - - if (!(sb->s_flags & MS_RDONLY)) { - EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); - es->s_state = cpu_to_le16(sbi->s_mount_state); - } - if (sb->s_dirt || !(sb->s_flags & MS_RDONLY)) - ext4_commit_super(sb, 1); - - if (sbi->s_proc) { - remove_proc_entry("options", sbi->s_proc); - remove_proc_entry(sb->s_id, ext4_proc_root); - } - kobject_del(&sbi->s_kobj); - - for (i = 0; i < sbi->s_gdb_count; i++) - brelse(sbi->s_group_desc[i]); - ext4_kvfree(sbi->s_group_desc); - ext4_kvfree(sbi->s_flex_groups); - percpu_counter_destroy(&sbi->s_freeclusters_counter); - percpu_counter_destroy(&sbi->s_freeinodes_counter); - percpu_counter_destroy(&sbi->s_dirs_counter); - percpu_counter_destroy(&sbi->s_dirtyclusters_counter); - brelse(sbi->s_sbh); -#ifdef CONFIG_QUOTA - for (i = 0; i < MAXQUOTAS; i++) - kfree(sbi->s_qf_names[i]); -#endif - - /* Debugging code just in case the in-memory inode orphan list - * isn't empty. The on-disk one can be non-empty if we've - * detected an error and taken the fs readonly, but the - * in-memory list had better be clean by this point. */ - if (!list_empty(&sbi->s_orphan)) - dump_orphan_list(sb, sbi); - J_ASSERT(list_empty(&sbi->s_orphan)); - - invalidate_bdev(sb->s_bdev); - if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { - /* - * Invalidate the journal device's buffers. We don't want them - * floating about in memory - the physical journal device may - * hotswapped, and it breaks the `ro-after' testing code. - */ - sync_blockdev(sbi->journal_bdev); - invalidate_bdev(sbi->journal_bdev); - ext4_blkdev_remove(sbi); - } - if (sbi->s_mmp_tsk) - kthread_stop(sbi->s_mmp_tsk); - sb->s_fs_info = NULL; - /* - * Now that we are completely done shutting down the - * superblock, we need to actually destroy the kobject. - */ - unlock_super(sb); - kobject_put(&sbi->s_kobj); - wait_for_completion(&sbi->s_kobj_unregister); - kfree(sbi->s_blockgroup_lock); - kfree(sbi); -} - -static struct kmem_cache *ext4_inode_cachep; - -/* - * Called inside transaction, so use GFP_NOFS - */ -static struct inode *ext4_alloc_inode(struct super_block *sb) -{ - struct ext4_inode_info *ei; - - ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); - if (!ei) - return NULL; - - ei->vfs_inode.i_version = 1; - ei->vfs_inode.i_data.writeback_index = 0; - memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); - INIT_LIST_HEAD(&ei->i_prealloc_list); - spin_lock_init(&ei->i_prealloc_lock); - ei->i_reserved_data_blocks = 0; - ei->i_reserved_meta_blocks = 0; - ei->i_allocated_meta_blocks = 0; - ei->i_da_metadata_calc_len = 0; - spin_lock_init(&(ei->i_block_reservation_lock)); -#ifdef CONFIG_QUOTA - ei->i_reserved_quota = 0; -#endif - ei->jinode = NULL; - INIT_LIST_HEAD(&ei->i_completed_io_list); - spin_lock_init(&ei->i_completed_io_lock); - ei->cur_aio_dio = NULL; - ei->i_sync_tid = 0; - ei->i_datasync_tid = 0; - atomic_set(&ei->i_ioend_count, 0); - atomic_set(&ei->i_aiodio_unwritten, 0); - - return &ei->vfs_inode; -} - -static int ext4_drop_inode(struct inode *inode) -{ - int drop = generic_drop_inode(inode); - - trace_ext4_drop_inode(inode, drop); - return drop; -} - -static void ext4_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); -} - -static void ext4_destroy_inode(struct inode *inode) -{ - if (!list_empty(&(EXT4_I(inode)->i_orphan))) { - ext4_msg(inode->i_sb, KERN_ERR, - "Inode %lu (%p): orphan list check failed!", - inode->i_ino, EXT4_I(inode)); - print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, - EXT4_I(inode), sizeof(struct ext4_inode_info), - true); - dump_stack(); - } - call_rcu(&inode->i_rcu, ext4_i_callback); -} - -static void init_once(void *foo) -{ - struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; - - INIT_LIST_HEAD(&ei->i_orphan); -#ifdef CONFIG_EXT4_FS_XATTR - init_rwsem(&ei->xattr_sem); -#endif - init_rwsem(&ei->i_data_sem); - inode_init_once(&ei->vfs_inode); -} - -static int init_inodecache(void) -{ - ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", - sizeof(struct ext4_inode_info), - 0, (SLAB_RECLAIM_ACCOUNT| - SLAB_MEM_SPREAD), - init_once); - if (ext4_inode_cachep == NULL) - return -ENOMEM; - return 0; -} - -static void destroy_inodecache(void) -{ - kmem_cache_destroy(ext4_inode_cachep); -} - -void ext4_clear_inode(struct inode *inode) -{ - invalidate_inode_buffers(inode); - end_writeback(inode); - dquot_drop(inode); - ext4_discard_preallocations(inode); - if (EXT4_I(inode)->jinode) { - jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), - EXT4_I(inode)->jinode); - jbd2_free_inode(EXT4_I(inode)->jinode); - EXT4_I(inode)->jinode = NULL; - } -} - -static struct inode *ext4_nfs_get_inode(struct super_block *sb, - u64 ino, u32 generation) -{ - struct inode *inode; - - if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) - return ERR_PTR(-ESTALE); - if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) - return ERR_PTR(-ESTALE); - - /* iget isn't really right if the inode is currently unallocated!! - * - * ext4_read_inode will return a bad_inode if the inode had been - * deleted, so we should be safe. - * - * Currently we don't know the generation for parent directory, so - * a generation of 0 means "accept any" - */ - inode = ext4_iget(sb, ino); - if (IS_ERR(inode)) - return ERR_CAST(inode); - if (generation && inode->i_generation != generation) { - iput(inode); - return ERR_PTR(-ESTALE); - } - - return inode; -} - -static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type) -{ - return generic_fh_to_dentry(sb, fid, fh_len, fh_type, - ext4_nfs_get_inode); -} - -static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type) -{ - return generic_fh_to_parent(sb, fid, fh_len, fh_type, - ext4_nfs_get_inode); -} - -/* - * Try to release metadata pages (indirect blocks, directories) which are - * mapped via the block device. Since these pages could have journal heads - * which would prevent try_to_free_buffers() from freeing them, we must use - * jbd2 layer's try_to_free_buffers() function to release them. - */ -static int bdev_try_to_free_page(struct super_block *sb, struct page *page, - gfp_t wait) -{ - journal_t *journal = EXT4_SB(sb)->s_journal; - - WARN_ON(PageChecked(page)); - if (!page_has_buffers(page)) - return 0; - if (journal) - return jbd2_journal_try_to_free_buffers(journal, page, - wait & ~__GFP_WAIT); - return try_to_free_buffers(page); -} - -#ifdef CONFIG_QUOTA -#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") -#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) - -static int ext4_write_dquot(struct dquot *dquot); -static int ext4_acquire_dquot(struct dquot *dquot); -static int ext4_release_dquot(struct dquot *dquot); -static int ext4_mark_dquot_dirty(struct dquot *dquot); -static int ext4_write_info(struct super_block *sb, int type); -static int ext4_quota_on(struct super_block *sb, int type, int format_id, - struct path *path); -static int ext4_quota_off(struct super_block *sb, int type); -static int ext4_quota_on_mount(struct super_block *sb, int type); -static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, - size_t len, loff_t off); -static ssize_t ext4_quota_write(struct super_block *sb, int type, - const char *data, size_t len, loff_t off); - -static const struct dquot_operations ext4_quota_operations = { - .get_reserved_space = ext4_get_reserved_space, - .write_dquot = ext4_write_dquot, - .acquire_dquot = ext4_acquire_dquot, - .release_dquot = ext4_release_dquot, - .mark_dirty = ext4_mark_dquot_dirty, - .write_info = ext4_write_info, - .alloc_dquot = dquot_alloc, - .destroy_dquot = dquot_destroy, -}; - -static const struct quotactl_ops ext4_qctl_operations = { - .quota_on = ext4_quota_on, - .quota_off = ext4_quota_off, - .quota_sync = dquot_quota_sync, - .get_info = dquot_get_dqinfo, - .set_info = dquot_set_dqinfo, - .get_dqblk = dquot_get_dqblk, - .set_dqblk = dquot_set_dqblk -}; -#endif - -static const struct super_operations ext4_sops = { - .alloc_inode = ext4_alloc_inode, - .destroy_inode = ext4_destroy_inode, - .write_inode = ext4_write_inode, - .dirty_inode = ext4_dirty_inode, - .drop_inode = ext4_drop_inode, - .evict_inode = ext4_evict_inode, - .put_super = ext4_put_super, - .sync_fs = ext4_sync_fs, - .freeze_fs = ext4_freeze, - .unfreeze_fs = ext4_unfreeze, - .statfs = ext4_statfs, - .remount_fs = ext4_remount, - .show_options = ext4_show_options, -#ifdef CONFIG_QUOTA - .quota_read = ext4_quota_read, - .quota_write = ext4_quota_write, -#endif - .bdev_try_to_free_page = bdev_try_to_free_page, -}; - -static const struct super_operations ext4_nojournal_sops = { - .alloc_inode = ext4_alloc_inode, - .destroy_inode = ext4_destroy_inode, - .write_inode = ext4_write_inode, - .dirty_inode = ext4_dirty_inode, - .drop_inode = ext4_drop_inode, - .evict_inode = ext4_evict_inode, - .write_super = ext4_write_super, - .put_super = ext4_put_super, - .statfs = ext4_statfs, - .remount_fs = ext4_remount, - .show_options = ext4_show_options, -#ifdef CONFIG_QUOTA - .quota_read = ext4_quota_read, - .quota_write = ext4_quota_write, -#endif - .bdev_try_to_free_page = bdev_try_to_free_page, -}; - -static const struct export_operations ext4_export_ops = { - .fh_to_dentry = ext4_fh_to_dentry, - .fh_to_parent = ext4_fh_to_parent, - .get_parent = ext4_get_parent, -}; - -enum { - Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, - Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, - Opt_nouid32, Opt_debug, Opt_removed, - Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, - Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, - Opt_commit, Opt_min_batch_time, Opt_max_batch_time, - Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit, - Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, - Opt_data_err_abort, Opt_data_err_ignore, - Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, - Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, - Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, - Opt_usrquota, Opt_grpquota, Opt_i_version, - Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, - Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, - Opt_inode_readahead_blks, Opt_journal_ioprio, - Opt_dioread_nolock, Opt_dioread_lock, - Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, -}; - -static const match_table_t tokens = { - {Opt_bsd_df, "bsddf"}, - {Opt_minix_df, "minixdf"}, - {Opt_grpid, "grpid"}, - {Opt_grpid, "bsdgroups"}, - {Opt_nogrpid, "nogrpid"}, - {Opt_nogrpid, "sysvgroups"}, - {Opt_resgid, "resgid=%u"}, - {Opt_resuid, "resuid=%u"}, - {Opt_sb, "sb=%u"}, - {Opt_err_cont, "errors=continue"}, - {Opt_err_panic, "errors=panic"}, - {Opt_err_ro, "errors=remount-ro"}, - {Opt_nouid32, "nouid32"}, - {Opt_debug, "debug"}, - {Opt_removed, "oldalloc"}, - {Opt_removed, "orlov"}, - {Opt_user_xattr, "user_xattr"}, - {Opt_nouser_xattr, "nouser_xattr"}, - {Opt_acl, "acl"}, - {Opt_noacl, "noacl"}, - {Opt_noload, "norecovery"}, - {Opt_noload, "noload"}, - {Opt_removed, "nobh"}, - {Opt_removed, "bh"}, - {Opt_commit, "commit=%u"}, - {Opt_min_batch_time, "min_batch_time=%u"}, - {Opt_max_batch_time, "max_batch_time=%u"}, - {Opt_journal_dev, "journal_dev=%u"}, - {Opt_journal_checksum, "journal_checksum"}, - {Opt_journal_async_commit, "journal_async_commit"}, - {Opt_abort, "abort"}, - {Opt_data_journal, "data=journal"}, - {Opt_data_ordered, "data=ordered"}, - {Opt_data_writeback, "data=writeback"}, - {Opt_data_err_abort, "data_err=abort"}, - {Opt_data_err_ignore, "data_err=ignore"}, - {Opt_offusrjquota, "usrjquota="}, - {Opt_usrjquota, "usrjquota=%s"}, - {Opt_offgrpjquota, "grpjquota="}, - {Opt_grpjquota, "grpjquota=%s"}, - {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, - {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, - {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, - {Opt_grpquota, "grpquota"}, - {Opt_noquota, "noquota"}, - {Opt_quota, "quota"}, - {Opt_usrquota, "usrquota"}, - {Opt_barrier, "barrier=%u"}, - {Opt_barrier, "barrier"}, - {Opt_nobarrier, "nobarrier"}, - {Opt_i_version, "i_version"}, - {Opt_stripe, "stripe=%u"}, - {Opt_delalloc, "delalloc"}, - {Opt_nodelalloc, "nodelalloc"}, - {Opt_mblk_io_submit, "mblk_io_submit"}, - {Opt_nomblk_io_submit, "nomblk_io_submit"}, - {Opt_block_validity, "block_validity"}, - {Opt_noblock_validity, "noblock_validity"}, - {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, - {Opt_journal_ioprio, "journal_ioprio=%u"}, - {Opt_auto_da_alloc, "auto_da_alloc=%u"}, - {Opt_auto_da_alloc, "auto_da_alloc"}, - {Opt_noauto_da_alloc, "noauto_da_alloc"}, - {Opt_dioread_nolock, "dioread_nolock"}, - {Opt_dioread_lock, "dioread_lock"}, - {Opt_discard, "discard"}, - {Opt_nodiscard, "nodiscard"}, - {Opt_init_itable, "init_itable=%u"}, - {Opt_init_itable, "init_itable"}, - {Opt_noinit_itable, "noinit_itable"}, - {Opt_removed, "check=none"}, /* mount option from ext2/3 */ - {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ - {Opt_removed, "reservation"}, /* mount option from ext2/3 */ - {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ - {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ - {Opt_err, NULL}, -}; - -static ext4_fsblk_t get_sb_block(void **data) -{ - ext4_fsblk_t sb_block; - char *options = (char *) *data; - - if (!options || strncmp(options, "sb=", 3) != 0) - return 1; /* Default location */ - - options += 3; - /* TODO: use simple_strtoll with >32bit ext4 */ - sb_block = simple_strtoul(options, &options, 0); - if (*options && *options != ',') { - printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", - (char *) *data); - return 1; - } - if (*options == ',') - options++; - *data = (void *) options; - - return sb_block; -} - -#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) -static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" - "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; - -#ifdef CONFIG_QUOTA -static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - char *qname; - - if (sb_any_quota_loaded(sb) && - !sbi->s_qf_names[qtype]) { - ext4_msg(sb, KERN_ERR, - "Cannot change journaled " - "quota options when quota turned on"); - return -1; - } - qname = match_strdup(args); - if (!qname) { - ext4_msg(sb, KERN_ERR, - "Not enough memory for storing quotafile name"); - return -1; - } - if (sbi->s_qf_names[qtype] && - strcmp(sbi->s_qf_names[qtype], qname)) { - ext4_msg(sb, KERN_ERR, - "%s quota file already specified", QTYPE2NAME(qtype)); - kfree(qname); - return -1; - } - sbi->s_qf_names[qtype] = qname; - if (strchr(sbi->s_qf_names[qtype], '/')) { - ext4_msg(sb, KERN_ERR, - "quotafile must be on filesystem root"); - kfree(sbi->s_qf_names[qtype]); - sbi->s_qf_names[qtype] = NULL; - return -1; - } - set_opt(sb, QUOTA); - return 1; -} - -static int clear_qf_name(struct super_block *sb, int qtype) -{ - - struct ext4_sb_info *sbi = EXT4_SB(sb); - - if (sb_any_quota_loaded(sb) && - sbi->s_qf_names[qtype]) { - ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" - " when quota turned on"); - return -1; - } - /* - * The space will be released later when all options are confirmed - * to be correct - */ - sbi->s_qf_names[qtype] = NULL; - return 1; -} -#endif - -#define MOPT_SET 0x0001 -#define MOPT_CLEAR 0x0002 -#define MOPT_NOSUPPORT 0x0004 -#define MOPT_EXPLICIT 0x0008 -#define MOPT_CLEAR_ERR 0x0010 -#define MOPT_GTE0 0x0020 -#ifdef CONFIG_QUOTA -#define MOPT_Q 0 -#define MOPT_QFMT 0x0040 -#else -#define MOPT_Q MOPT_NOSUPPORT -#define MOPT_QFMT MOPT_NOSUPPORT -#endif -#define MOPT_DATAJ 0x0080 - -static const struct mount_opts { - int token; - int mount_opt; - int flags; -} ext4_mount_opts[] = { - {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, - {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, - {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, - {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, - {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET}, - {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR}, - {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, - {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, - {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET}, - {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR}, - {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, - {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, - {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT}, - {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT}, - {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET}, - {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | - EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET}, - {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET}, - {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, - {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, - {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, - {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET}, - {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR}, - {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, - {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, - {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, - {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, - {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, - {Opt_commit, 0, MOPT_GTE0}, - {Opt_max_batch_time, 0, MOPT_GTE0}, - {Opt_min_batch_time, 0, MOPT_GTE0}, - {Opt_inode_readahead_blks, 0, MOPT_GTE0}, - {Opt_init_itable, 0, MOPT_GTE0}, - {Opt_stripe, 0, MOPT_GTE0}, - {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ}, - {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ}, - {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ}, -#ifdef CONFIG_EXT4_FS_XATTR - {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, - {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, -#else - {Opt_user_xattr, 0, MOPT_NOSUPPORT}, - {Opt_nouser_xattr, 0, MOPT_NOSUPPORT}, -#endif -#ifdef CONFIG_EXT4_FS_POSIX_ACL - {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, - {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, -#else - {Opt_acl, 0, MOPT_NOSUPPORT}, - {Opt_noacl, 0, MOPT_NOSUPPORT}, -#endif - {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, - {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, - {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, - {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, - MOPT_SET | MOPT_Q}, - {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, - MOPT_SET | MOPT_Q}, - {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | - EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, - {Opt_usrjquota, 0, MOPT_Q}, - {Opt_grpjquota, 0, MOPT_Q}, - {Opt_offusrjquota, 0, MOPT_Q}, - {Opt_offgrpjquota, 0, MOPT_Q}, - {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, - {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, - {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, - {Opt_err, 0, 0} -}; - -static int handle_mount_opt(struct super_block *sb, char *opt, int token, - substring_t *args, unsigned long *journal_devnum, - unsigned int *journal_ioprio, int is_remount) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - const struct mount_opts *m; - int arg = 0; - -#ifdef CONFIG_QUOTA - if (token == Opt_usrjquota) - return set_qf_name(sb, USRQUOTA, &args[0]); - else if (token == Opt_grpjquota) - return set_qf_name(sb, GRPQUOTA, &args[0]); - else if (token == Opt_offusrjquota) - return clear_qf_name(sb, USRQUOTA); - else if (token == Opt_offgrpjquota) - return clear_qf_name(sb, GRPQUOTA); -#endif - if (args->from && match_int(args, &arg)) - return -1; - switch (token) { - case Opt_noacl: - case Opt_nouser_xattr: - ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); - break; - case Opt_sb: - return 1; /* handled by get_sb_block() */ - case Opt_removed: - ext4_msg(sb, KERN_WARNING, - "Ignoring removed %s option", opt); - return 1; - case Opt_resuid: - sbi->s_resuid = arg; - return 1; - case Opt_resgid: - sbi->s_resgid = arg; - return 1; - case Opt_abort: - sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; - return 1; - case Opt_i_version: - sb->s_flags |= MS_I_VERSION; - return 1; - case Opt_journal_dev: - if (is_remount) { - ext4_msg(sb, KERN_ERR, - "Cannot specify journal on remount"); - return -1; - } - *journal_devnum = arg; - return 1; - case Opt_journal_ioprio: - if (arg < 0 || arg > 7) - return -1; - *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); - return 1; - } - - for (m = ext4_mount_opts; m->token != Opt_err; m++) { - if (token != m->token) - continue; - if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) - return -1; - if (m->flags & MOPT_EXPLICIT) - set_opt2(sb, EXPLICIT_DELALLOC); - if (m->flags & MOPT_CLEAR_ERR) - clear_opt(sb, ERRORS_MASK); - if (token == Opt_noquota && sb_any_quota_loaded(sb)) { - ext4_msg(sb, KERN_ERR, "Cannot change quota " - "options when quota turned on"); - return -1; - } - - if (m->flags & MOPT_NOSUPPORT) { - ext4_msg(sb, KERN_ERR, "%s option not supported", opt); - } else if (token == Opt_commit) { - if (arg == 0) - arg = JBD2_DEFAULT_MAX_COMMIT_AGE; - sbi->s_commit_interval = HZ * arg; - } else if (token == Opt_max_batch_time) { - if (arg == 0) - arg = EXT4_DEF_MAX_BATCH_TIME; - sbi->s_max_batch_time = arg; - } else if (token == Opt_min_batch_time) { - sbi->s_min_batch_time = arg; - } else if (token == Opt_inode_readahead_blks) { - if (arg > (1 << 30)) - return -1; - if (arg && !is_power_of_2(arg)) { - ext4_msg(sb, KERN_ERR, - "EXT4-fs: inode_readahead_blks" - " must be a power of 2"); - return -1; - } - sbi->s_inode_readahead_blks = arg; - } else if (token == Opt_init_itable) { - set_opt(sb, INIT_INODE_TABLE); - if (!args->from) - arg = EXT4_DEF_LI_WAIT_MULT; - sbi->s_li_wait_mult = arg; - } else if (token == Opt_stripe) { - sbi->s_stripe = arg; - } else if (m->flags & MOPT_DATAJ) { - if (is_remount) { - if (!sbi->s_journal) - ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); - else if (test_opt(sb, DATA_FLAGS) != - m->mount_opt) { - ext4_msg(sb, KERN_ERR, - "Cannot change data mode on remount"); - return -1; - } - } else { - clear_opt(sb, DATA_FLAGS); - sbi->s_mount_opt |= m->mount_opt; - } -#ifdef CONFIG_QUOTA - } else if (m->flags & MOPT_QFMT) { - if (sb_any_quota_loaded(sb) && - sbi->s_jquota_fmt != m->mount_opt) { - ext4_msg(sb, KERN_ERR, "Cannot " - "change journaled quota options " - "when quota turned on"); - return -1; - } - sbi->s_jquota_fmt = m->mount_opt; -#endif - } else { - if (!args->from) - arg = 1; - if (m->flags & MOPT_CLEAR) - arg = !arg; - else if (unlikely(!(m->flags & MOPT_SET))) { - ext4_msg(sb, KERN_WARNING, - "buggy handling of option %s", opt); - WARN_ON(1); - return -1; - } - if (arg != 0) - sbi->s_mount_opt |= m->mount_opt; - else - sbi->s_mount_opt &= ~m->mount_opt; - } - return 1; - } - ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " - "or missing value", opt); - return -1; -} - -static int parse_options(char *options, struct super_block *sb, - unsigned long *journal_devnum, - unsigned int *journal_ioprio, - int is_remount) -{ -#ifdef CONFIG_QUOTA - struct ext4_sb_info *sbi = EXT4_SB(sb); -#endif - char *p; - substring_t args[MAX_OPT_ARGS]; - int token; - - if (!options) - return 1; - - while ((p = strsep(&options, ",")) != NULL) { - if (!*p) - continue; - /* - * Initialize args struct so we know whether arg was - * found; some options take optional arguments. - */ - args[0].to = args[0].from = 0; - token = match_token(p, tokens, args); - if (handle_mount_opt(sb, p, token, args, journal_devnum, - journal_ioprio, is_remount) < 0) - return 0; - } -#ifdef CONFIG_QUOTA - if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { - if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) - clear_opt(sb, USRQUOTA); - - if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) - clear_opt(sb, GRPQUOTA); - - if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { - ext4_msg(sb, KERN_ERR, "old and new quota " - "format mixing"); - return 0; - } - - if (!sbi->s_jquota_fmt) { - ext4_msg(sb, KERN_ERR, "journaled quota format " - "not specified"); - return 0; - } - } else { - if (sbi->s_jquota_fmt) { - ext4_msg(sb, KERN_ERR, "journaled quota format " - "specified with no journaling " - "enabled"); - return 0; - } - } -#endif - return 1; -} - -static inline void ext4_show_quota_options(struct seq_file *seq, - struct super_block *sb) -{ -#if defined(CONFIG_QUOTA) - struct ext4_sb_info *sbi = EXT4_SB(sb); - - if (sbi->s_jquota_fmt) { - char *fmtname = ""; - - switch (sbi->s_jquota_fmt) { - case QFMT_VFS_OLD: - fmtname = "vfsold"; - break; - case QFMT_VFS_V0: - fmtname = "vfsv0"; - break; - case QFMT_VFS_V1: - fmtname = "vfsv1"; - break; - } - seq_printf(seq, ",jqfmt=%s", fmtname); - } - - if (sbi->s_qf_names[USRQUOTA]) - seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); - - if (sbi->s_qf_names[GRPQUOTA]) - seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); - - if (test_opt(sb, USRQUOTA)) - seq_puts(seq, ",usrquota"); - - if (test_opt(sb, GRPQUOTA)) - seq_puts(seq, ",grpquota"); -#endif -} - -static const char *token2str(int token) -{ - static const struct match_token *t; - - for (t = tokens; t->token != Opt_err; t++) - if (t->token == token && !strchr(t->pattern, '=')) - break; - return t->pattern; -} - -/* - * Show an option if - * - it's set to a non-default value OR - * - if the per-sb default is different from the global default - */ -static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, - int nodefs) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_super_block *es = sbi->s_es; - int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; - const struct mount_opts *m; - char sep = nodefs ? '\n' : ','; - -#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) -#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) - - if (sbi->s_sb_block != 1) - SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); - - for (m = ext4_mount_opts; m->token != Opt_err; m++) { - int want_set = m->flags & MOPT_SET; - if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || - (m->flags & MOPT_CLEAR_ERR)) - continue; - if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) - continue; /* skip if same as the default */ - if ((want_set && - (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || - (!want_set && (sbi->s_mount_opt & m->mount_opt))) - continue; /* select Opt_noFoo vs Opt_Foo */ - SEQ_OPTS_PRINT("%s", token2str(m->token)); - } - - if (nodefs || sbi->s_resuid != EXT4_DEF_RESUID || - le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) - SEQ_OPTS_PRINT("resuid=%u", sbi->s_resuid); - if (nodefs || sbi->s_resgid != EXT4_DEF_RESGID || - le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) - SEQ_OPTS_PRINT("resgid=%u", sbi->s_resgid); - def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); - if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) - SEQ_OPTS_PUTS("errors=remount-ro"); - if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) - SEQ_OPTS_PUTS("errors=continue"); - if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) - SEQ_OPTS_PUTS("errors=panic"); - if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) - SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); - if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) - SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); - if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) - SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); - if (sb->s_flags & MS_I_VERSION) - SEQ_OPTS_PUTS("i_version"); - if (nodefs || sbi->s_stripe) - SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); - if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { - if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) - SEQ_OPTS_PUTS("data=journal"); - else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) - SEQ_OPTS_PUTS("data=ordered"); - else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) - SEQ_OPTS_PUTS("data=writeback"); - } - if (nodefs || - sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) - SEQ_OPTS_PRINT("inode_readahead_blks=%u", - sbi->s_inode_readahead_blks); - - if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && - (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) - SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); - - ext4_show_quota_options(seq, sb); - return 0; -} - -static int ext4_show_options(struct seq_file *seq, struct dentry *root) -{ - return _ext4_show_options(seq, root->d_sb, 0); -} - -static int options_seq_show(struct seq_file *seq, void *offset) -{ - struct super_block *sb = seq->private; - int rc; - - seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); - rc = _ext4_show_options(seq, sb, 1); - seq_puts(seq, "\n"); - return rc; -} - -static int options_open_fs(struct inode *inode, struct file *file) -{ - return single_open(file, options_seq_show, PDE(inode)->data); -} - -static const struct file_operations ext4_seq_options_fops = { - .owner = THIS_MODULE, - .open = options_open_fs, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, - int read_only) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - int res = 0; - - if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { - ext4_msg(sb, KERN_ERR, "revision level too high, " - "forcing read-only mode"); - res = MS_RDONLY; - } - if (read_only) - goto done; - if (!(sbi->s_mount_state & EXT4_VALID_FS)) - ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " - "running e2fsck is recommended"); - else if ((sbi->s_mount_state & EXT4_ERROR_FS)) - ext4_msg(sb, KERN_WARNING, - "warning: mounting fs with errors, " - "running e2fsck is recommended"); - else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && - le16_to_cpu(es->s_mnt_count) >= - (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) - ext4_msg(sb, KERN_WARNING, - "warning: maximal mount count reached, " - "running e2fsck is recommended"); - else if (le32_to_cpu(es->s_checkinterval) && - (le32_to_cpu(es->s_lastcheck) + - le32_to_cpu(es->s_checkinterval) <= get_seconds())) - ext4_msg(sb, KERN_WARNING, - "warning: checktime reached, " - "running e2fsck is recommended"); - if (!sbi->s_journal) - es->s_state &= cpu_to_le16(~EXT4_VALID_FS); - if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) - es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); - le16_add_cpu(&es->s_mnt_count, 1); - es->s_mtime = cpu_to_le32(get_seconds()); - ext4_update_dynamic_rev(sb); - if (sbi->s_journal) - EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); - - ext4_commit_super(sb, 1); -done: - if (test_opt(sb, DEBUG)) - printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " - "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", - sb->s_blocksize, - sbi->s_groups_count, - EXT4_BLOCKS_PER_GROUP(sb), - EXT4_INODES_PER_GROUP(sb), - sbi->s_mount_opt, sbi->s_mount_opt2); - - cleancache_init_fs(sb); - return res; -} - -static int ext4_fill_flex_info(struct super_block *sb) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_group_desc *gdp = NULL; - ext4_group_t flex_group_count; - ext4_group_t flex_group; - unsigned int groups_per_flex = 0; - size_t size; - int i; - - sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; - if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { - sbi->s_log_groups_per_flex = 0; - return 1; - } - groups_per_flex = 1 << sbi->s_log_groups_per_flex; - - /* We allocate both existing and potentially added groups */ - flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + - ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << - EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; - size = flex_group_count * sizeof(struct flex_groups); - sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL); - if (sbi->s_flex_groups == NULL) { - ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups", - flex_group_count); - goto failed; - } - - for (i = 0; i < sbi->s_groups_count; i++) { - gdp = ext4_get_group_desc(sb, i, NULL); - - flex_group = ext4_flex_group(sbi, i); - atomic_add(ext4_free_inodes_count(sb, gdp), - &sbi->s_flex_groups[flex_group].free_inodes); - atomic_add(ext4_free_group_clusters(sb, gdp), - &sbi->s_flex_groups[flex_group].free_clusters); - atomic_add(ext4_used_dirs_count(sb, gdp), - &sbi->s_flex_groups[flex_group].used_dirs); - } - - return 1; -failed: - return 0; -} - -__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, - struct ext4_group_desc *gdp) -{ - __u16 crc = 0; - - if (sbi->s_es->s_feature_ro_compat & - cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { - int offset = offsetof(struct ext4_group_desc, bg_checksum); - __le32 le_group = cpu_to_le32(block_group); - - crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); - crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); - crc = crc16(crc, (__u8 *)gdp, offset); - offset += sizeof(gdp->bg_checksum); /* skip checksum */ - /* for checksum of struct ext4_group_desc do the rest...*/ - if ((sbi->s_es->s_feature_incompat & - cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && - offset < le16_to_cpu(sbi->s_es->s_desc_size)) - crc = crc16(crc, (__u8 *)gdp + offset, - le16_to_cpu(sbi->s_es->s_desc_size) - - offset); - } - - return cpu_to_le16(crc); -} - -int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, - struct ext4_group_desc *gdp) -{ - if ((sbi->s_es->s_feature_ro_compat & - cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && - (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) - return 0; - - return 1; -} - -/* Called at mount-time, super-block is locked */ -static int ext4_check_descriptors(struct super_block *sb, - ext4_group_t *first_not_zeroed) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); - ext4_fsblk_t last_block; - ext4_fsblk_t block_bitmap; - ext4_fsblk_t inode_bitmap; - ext4_fsblk_t inode_table; - int flexbg_flag = 0; - ext4_group_t i, grp = sbi->s_groups_count; - - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) - flexbg_flag = 1; - - ext4_debug("Checking group descriptors"); - - for (i = 0; i < sbi->s_groups_count; i++) { - struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); - - if (i == sbi->s_groups_count - 1 || flexbg_flag) - last_block = ext4_blocks_count(sbi->s_es) - 1; - else - last_block = first_block + - (EXT4_BLOCKS_PER_GROUP(sb) - 1); - - if ((grp == sbi->s_groups_count) && - !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) - grp = i; - - block_bitmap = ext4_block_bitmap(sb, gdp); - if (block_bitmap < first_block || block_bitmap > last_block) { - ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " - "Block bitmap for group %u not in group " - "(block %llu)!", i, block_bitmap); - return 0; - } - inode_bitmap = ext4_inode_bitmap(sb, gdp); - if (inode_bitmap < first_block || inode_bitmap > last_block) { - ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " - "Inode bitmap for group %u not in group " - "(block %llu)!", i, inode_bitmap); - return 0; - } - inode_table = ext4_inode_table(sb, gdp); - if (inode_table < first_block || - inode_table + sbi->s_itb_per_group - 1 > last_block) { - ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " - "Inode table for group %u not in group " - "(block %llu)!", i, inode_table); - return 0; - } - ext4_lock_group(sb, i); - if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { - ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " - "Checksum for group %u failed (%u!=%u)", - i, le16_to_cpu(ext4_group_desc_csum(sbi, i, - gdp)), le16_to_cpu(gdp->bg_checksum)); - if (!(sb->s_flags & MS_RDONLY)) { - ext4_unlock_group(sb, i); - return 0; - } - } - ext4_unlock_group(sb, i); - if (!flexbg_flag) - first_block += EXT4_BLOCKS_PER_GROUP(sb); - } - if (NULL != first_not_zeroed) - *first_not_zeroed = grp; - - ext4_free_blocks_count_set(sbi->s_es, - EXT4_C2B(sbi, ext4_count_free_clusters(sb))); - sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); - return 1; -} - -/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at - * the superblock) which were deleted from all directories, but held open by - * a process at the time of a crash. We walk the list and try to delete these - * inodes at recovery time (only with a read-write filesystem). - * - * In order to keep the orphan inode chain consistent during traversal (in - * case of crash during recovery), we link each inode into the superblock - * orphan list_head and handle it the same way as an inode deletion during - * normal operation (which journals the operations for us). - * - * We only do an iget() and an iput() on each inode, which is very safe if we - * accidentally point at an in-use or already deleted inode. The worst that - * can happen in this case is that we get a "bit already cleared" message from - * ext4_free_inode(). The only reason we would point at a wrong inode is if - * e2fsck was run on this filesystem, and it must have already done the orphan - * inode cleanup for us, so we can safely abort without any further action. - */ -static void ext4_orphan_cleanup(struct super_block *sb, - struct ext4_super_block *es) -{ - unsigned int s_flags = sb->s_flags; - int nr_orphans = 0, nr_truncates = 0; -#ifdef CONFIG_QUOTA - int i; -#endif - if (!es->s_last_orphan) { - jbd_debug(4, "no orphan inodes to clean up\n"); - return; - } - - if (bdev_read_only(sb->s_bdev)) { - ext4_msg(sb, KERN_ERR, "write access " - "unavailable, skipping orphan cleanup"); - return; - } - - /* Check if feature set would not allow a r/w mount */ - if (!ext4_feature_set_ok(sb, 0)) { - ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " - "unknown ROCOMPAT features"); - return; - } - - if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { - if (es->s_last_orphan) - jbd_debug(1, "Errors on filesystem, " - "clearing orphan list.\n"); - es->s_last_orphan = 0; - jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); - return; - } - - if (s_flags & MS_RDONLY) { - ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); - sb->s_flags &= ~MS_RDONLY; - } -#ifdef CONFIG_QUOTA - /* Needed for iput() to work correctly and not trash data */ - sb->s_flags |= MS_ACTIVE; - /* Turn on quotas so that they are updated correctly */ - for (i = 0; i < MAXQUOTAS; i++) { - if (EXT4_SB(sb)->s_qf_names[i]) { - int ret = ext4_quota_on_mount(sb, i); - if (ret < 0) - ext4_msg(sb, KERN_ERR, - "Cannot turn on journaled " - "quota: error %d", ret); - } - } -#endif - - while (es->s_last_orphan) { - struct inode *inode; - - inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); - if (IS_ERR(inode)) { - es->s_last_orphan = 0; - break; - } - - list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); - dquot_initialize(inode); - if (inode->i_nlink) { - ext4_msg(sb, KERN_DEBUG, - "%s: truncating inode %lu to %lld bytes", - __func__, inode->i_ino, inode->i_size); - jbd_debug(2, "truncating inode %lu to %lld bytes\n", - inode->i_ino, inode->i_size); - ext4_truncate(inode); - nr_truncates++; - } else { - ext4_msg(sb, KERN_DEBUG, - "%s: deleting unreferenced inode %lu", - __func__, inode->i_ino); - jbd_debug(2, "deleting unreferenced inode %lu\n", - inode->i_ino); - nr_orphans++; - } - iput(inode); /* The delete magic happens here! */ - } - -#define PLURAL(x) (x), ((x) == 1) ? "" : "s" - - if (nr_orphans) - ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", - PLURAL(nr_orphans)); - if (nr_truncates) - ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", - PLURAL(nr_truncates)); -#ifdef CONFIG_QUOTA - /* Turn quotas off */ - for (i = 0; i < MAXQUOTAS; i++) { - if (sb_dqopt(sb)->files[i]) - dquot_quota_off(sb, i); - } -#endif - sb->s_flags = s_flags; /* Restore MS_RDONLY status */ -} - -/* - * Maximal extent format file size. - * Resulting logical blkno at s_maxbytes must fit in our on-disk - * extent format containers, within a sector_t, and within i_blocks - * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, - * so that won't be a limiting factor. - * - * However there is other limiting factor. We do store extents in the form - * of starting block and length, hence the resulting length of the extent - * covering maximum file size must fit into on-disk format containers as - * well. Given that length is always by 1 unit bigger than max unit (because - * we count 0 as well) we have to lower the s_maxbytes by one fs block. - * - * Note, this does *not* consider any metadata overhead for vfs i_blocks. - */ -static loff_t ext4_max_size(int blkbits, int has_huge_files) -{ - loff_t res; - loff_t upper_limit = MAX_LFS_FILESIZE; - - /* small i_blocks in vfs inode? */ - if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { - /* - * CONFIG_LBDAF is not enabled implies the inode - * i_block represent total blocks in 512 bytes - * 32 == size of vfs inode i_blocks * 8 - */ - upper_limit = (1LL << 32) - 1; - - /* total blocks in file system block size */ - upper_limit >>= (blkbits - 9); - upper_limit <<= blkbits; - } - - /* - * 32-bit extent-start container, ee_block. We lower the maxbytes - * by one fs block, so ee_len can cover the extent of maximum file - * size - */ - res = (1LL << 32) - 1; - res <<= blkbits; - - /* Sanity check against vm- & vfs- imposed limits */ - if (res > upper_limit) - res = upper_limit; - - return res; -} - -/* - * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect - * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. - * We need to be 1 filesystem block less than the 2^48 sector limit. - */ -static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) -{ - loff_t res = EXT4_NDIR_BLOCKS; - int meta_blocks; - loff_t upper_limit; - /* This is calculated to be the largest file size for a dense, block - * mapped file such that the file's total number of 512-byte sectors, - * including data and all indirect blocks, does not exceed (2^48 - 1). - * - * __u32 i_blocks_lo and _u16 i_blocks_high represent the total - * number of 512-byte sectors of the file. - */ - - if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { - /* - * !has_huge_files or CONFIG_LBDAF not enabled implies that - * the inode i_block field represents total file blocks in - * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 - */ - upper_limit = (1LL << 32) - 1; - - /* total blocks in file system block size */ - upper_limit >>= (bits - 9); - - } else { - /* - * We use 48 bit ext4_inode i_blocks - * With EXT4_HUGE_FILE_FL set the i_blocks - * represent total number of blocks in - * file system block size - */ - upper_limit = (1LL << 48) - 1; - - } - - /* indirect blocks */ - meta_blocks = 1; - /* double indirect blocks */ - meta_blocks += 1 + (1LL << (bits-2)); - /* tripple indirect blocks */ - meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); - - upper_limit -= meta_blocks; - upper_limit <<= bits; - - res += 1LL << (bits-2); - res += 1LL << (2*(bits-2)); - res += 1LL << (3*(bits-2)); - res <<= bits; - if (res > upper_limit) - res = upper_limit; - - if (res > MAX_LFS_FILESIZE) - res = MAX_LFS_FILESIZE; - - return res; -} - -static ext4_fsblk_t descriptor_loc(struct super_block *sb, - ext4_fsblk_t logical_sb_block, int nr) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - ext4_group_t bg, first_meta_bg; - int has_super = 0; - - first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); - - if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || - nr < first_meta_bg) - return logical_sb_block + nr + 1; - bg = sbi->s_desc_per_block * nr; - if (ext4_bg_has_super(sb, bg)) - has_super = 1; - - return (has_super + ext4_group_first_block_no(sb, bg)); -} - -/** - * ext4_get_stripe_size: Get the stripe size. - * @sbi: In memory super block info - * - * If we have specified it via mount option, then - * use the mount option value. If the value specified at mount time is - * greater than the blocks per group use the super block value. - * If the super block value is greater than blocks per group return 0. - * Allocator needs it be less than blocks per group. - * - */ -static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) -{ - unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); - unsigned long stripe_width = - le32_to_cpu(sbi->s_es->s_raid_stripe_width); - int ret; - - if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) - ret = sbi->s_stripe; - else if (stripe_width <= sbi->s_blocks_per_group) - ret = stripe_width; - else if (stride <= sbi->s_blocks_per_group) - ret = stride; - else - ret = 0; - - /* - * If the stripe width is 1, this makes no sense and - * we set it to 0 to turn off stripe handling code. - */ - if (ret <= 1) - ret = 0; - - return ret; -} - -/* sysfs supprt */ - -struct ext4_attr { - struct attribute attr; - ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); - ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, - const char *, size_t); - int offset; -}; - -static int parse_strtoul(const char *buf, - unsigned long max, unsigned long *value) -{ - char *endp; - - *value = simple_strtoul(skip_spaces(buf), &endp, 0); - endp = skip_spaces(endp); - if (*endp || *value > max) - return -EINVAL; - - return 0; -} - -static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, - struct ext4_sb_info *sbi, - char *buf) -{ - return snprintf(buf, PAGE_SIZE, "%llu\n", - (s64) EXT4_C2B(sbi, - percpu_counter_sum(&sbi->s_dirtyclusters_counter))); -} - -static ssize_t session_write_kbytes_show(struct ext4_attr *a, - struct ext4_sb_info *sbi, char *buf) -{ - struct super_block *sb = sbi->s_buddy_cache->i_sb; - - if (!sb->s_bdev->bd_part) - return snprintf(buf, PAGE_SIZE, "0\n"); - return snprintf(buf, PAGE_SIZE, "%lu\n", - (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - - sbi->s_sectors_written_start) >> 1); -} - -static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, - struct ext4_sb_info *sbi, char *buf) -{ - struct super_block *sb = sbi->s_buddy_cache->i_sb; - - if (!sb->s_bdev->bd_part) - return snprintf(buf, PAGE_SIZE, "0\n"); - return snprintf(buf, PAGE_SIZE, "%llu\n", - (unsigned long long)(sbi->s_kbytes_written + - ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - - EXT4_SB(sb)->s_sectors_written_start) >> 1))); -} - -static ssize_t inode_readahead_blks_store(struct ext4_attr *a, - struct ext4_sb_info *sbi, - const char *buf, size_t count) -{ - unsigned long t; - - if (parse_strtoul(buf, 0x40000000, &t)) - return -EINVAL; - - if (t && !is_power_of_2(t)) - return -EINVAL; - - sbi->s_inode_readahead_blks = t; - return count; -} - -static ssize_t sbi_ui_show(struct ext4_attr *a, - struct ext4_sb_info *sbi, char *buf) -{ - unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); - - return snprintf(buf, PAGE_SIZE, "%u\n", *ui); -} - -static ssize_t sbi_ui_store(struct ext4_attr *a, - struct ext4_sb_info *sbi, - const char *buf, size_t count) -{ - unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); - unsigned long t; - - if (parse_strtoul(buf, 0xffffffff, &t)) - return -EINVAL; - *ui = t; - return count; -} - -#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ -static struct ext4_attr ext4_attr_##_name = { \ - .attr = {.name = __stringify(_name), .mode = _mode }, \ - .show = _show, \ - .store = _store, \ - .offset = offsetof(struct ext4_sb_info, _elname), \ -} -#define EXT4_ATTR(name, mode, show, store) \ -static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) - -#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) -#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) -#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) -#define EXT4_RW_ATTR_SBI_UI(name, elname) \ - EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) -#define ATTR_LIST(name) &ext4_attr_##name.attr - -EXT4_RO_ATTR(delayed_allocation_blocks); -EXT4_RO_ATTR(session_write_kbytes); -EXT4_RO_ATTR(lifetime_write_kbytes); -EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, - inode_readahead_blks_store, s_inode_readahead_blks); -EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); -EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); -EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); -EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); -EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); -EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); -EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); -EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); - -static struct attribute *ext4_attrs[] = { - ATTR_LIST(delayed_allocation_blocks), - ATTR_LIST(session_write_kbytes), - ATTR_LIST(lifetime_write_kbytes), - ATTR_LIST(inode_readahead_blks), - ATTR_LIST(inode_goal), - ATTR_LIST(mb_stats), - ATTR_LIST(mb_max_to_scan), - ATTR_LIST(mb_min_to_scan), - ATTR_LIST(mb_order2_req), - ATTR_LIST(mb_stream_req), - ATTR_LIST(mb_group_prealloc), - ATTR_LIST(max_writeback_mb_bump), - NULL, -}; - -/* Features this copy of ext4 supports */ -EXT4_INFO_ATTR(lazy_itable_init); -EXT4_INFO_ATTR(batched_discard); - -static struct attribute *ext4_feat_attrs[] = { - ATTR_LIST(lazy_itable_init), - ATTR_LIST(batched_discard), - NULL, -}; - -static ssize_t ext4_attr_show(struct kobject *kobj, - struct attribute *attr, char *buf) -{ - struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, - s_kobj); - struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); - - return a->show ? a->show(a, sbi, buf) : 0; -} - -static ssize_t ext4_attr_store(struct kobject *kobj, - struct attribute *attr, - const char *buf, size_t len) -{ - struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, - s_kobj); - struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); - - return a->store ? a->store(a, sbi, buf, len) : 0; -} - -static void ext4_sb_release(struct kobject *kobj) -{ - struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, - s_kobj); - complete(&sbi->s_kobj_unregister); -} - -static const struct sysfs_ops ext4_attr_ops = { - .show = ext4_attr_show, - .store = ext4_attr_store, -}; - -static struct kobj_type ext4_ktype = { - .default_attrs = ext4_attrs, - .sysfs_ops = &ext4_attr_ops, - .release = ext4_sb_release, -}; - -static void ext4_feat_release(struct kobject *kobj) -{ - complete(&ext4_feat->f_kobj_unregister); -} - -static struct kobj_type ext4_feat_ktype = { - .default_attrs = ext4_feat_attrs, - .sysfs_ops = &ext4_attr_ops, - .release = ext4_feat_release, -}; - -/* - * Check whether this filesystem can be mounted based on - * the features present and the RDONLY/RDWR mount requested. - * Returns 1 if this filesystem can be mounted as requested, - * 0 if it cannot be. - */ -static int ext4_feature_set_ok(struct super_block *sb, int readonly) -{ - if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { - ext4_msg(sb, KERN_ERR, - "Couldn't mount because of " - "unsupported optional features (%x)", - (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & - ~EXT4_FEATURE_INCOMPAT_SUPP)); - return 0; - } - - if (readonly) - return 1; - - /* Check that feature set is OK for a read-write mount */ - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { - ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " - "unsupported optional features (%x)", - (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & - ~EXT4_FEATURE_RO_COMPAT_SUPP)); - return 0; - } - /* - * Large file size enabled file system can only be mounted - * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF - */ - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { - if (sizeof(blkcnt_t) < sizeof(u64)) { - ext4_msg(sb, KERN_ERR, "Filesystem with huge files " - "cannot be mounted RDWR without " - "CONFIG_LBDAF"); - return 0; - } - } - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && - !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { - ext4_msg(sb, KERN_ERR, - "Can't support bigalloc feature without " - "extents feature\n"); - return 0; - } - return 1; -} - -/* - * This function is called once a day if we have errors logged - * on the file system - */ -static void print_daily_error_info(unsigned long arg) -{ - struct super_block *sb = (struct super_block *) arg; - struct ext4_sb_info *sbi; - struct ext4_super_block *es; - - sbi = EXT4_SB(sb); - es = sbi->s_es; - - if (es->s_error_count) - ext4_msg(sb, KERN_NOTICE, "error count: %u", - le32_to_cpu(es->s_error_count)); - if (es->s_first_error_time) { - printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", - sb->s_id, le32_to_cpu(es->s_first_error_time), - (int) sizeof(es->s_first_error_func), - es->s_first_error_func, - le32_to_cpu(es->s_first_error_line)); - if (es->s_first_error_ino) - printk(": inode %u", - le32_to_cpu(es->s_first_error_ino)); - if (es->s_first_error_block) - printk(": block %llu", (unsigned long long) - le64_to_cpu(es->s_first_error_block)); - printk("\n"); - } - if (es->s_last_error_time) { - printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", - sb->s_id, le32_to_cpu(es->s_last_error_time), - (int) sizeof(es->s_last_error_func), - es->s_last_error_func, - le32_to_cpu(es->s_last_error_line)); - if (es->s_last_error_ino) - printk(": inode %u", - le32_to_cpu(es->s_last_error_ino)); - if (es->s_last_error_block) - printk(": block %llu", (unsigned long long) - le64_to_cpu(es->s_last_error_block)); - printk("\n"); - } - mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ -} - -/* Find next suitable group and run ext4_init_inode_table */ -static int ext4_run_li_request(struct ext4_li_request *elr) -{ - struct ext4_group_desc *gdp = NULL; - ext4_group_t group, ngroups; - struct super_block *sb; - unsigned long timeout = 0; - int ret = 0; - - sb = elr->lr_super; - ngroups = EXT4_SB(sb)->s_groups_count; - - for (group = elr->lr_next_group; group < ngroups; group++) { - gdp = ext4_get_group_desc(sb, group, NULL); - if (!gdp) { - ret = 1; - break; - } - - if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) - break; - } - - if (group == ngroups) - ret = 1; - - if (!ret) { - timeout = jiffies; - ret = ext4_init_inode_table(sb, group, - elr->lr_timeout ? 0 : 1); - if (elr->lr_timeout == 0) { - timeout = (jiffies - timeout) * - elr->lr_sbi->s_li_wait_mult; - elr->lr_timeout = timeout; - } - elr->lr_next_sched = jiffies + elr->lr_timeout; - elr->lr_next_group = group + 1; - } - - return ret; -} - -/* - * Remove lr_request from the list_request and free the - * request structure. Should be called with li_list_mtx held - */ -static void ext4_remove_li_request(struct ext4_li_request *elr) -{ - struct ext4_sb_info *sbi; - - if (!elr) - return; - - sbi = elr->lr_sbi; - - list_del(&elr->lr_request); - sbi->s_li_request = NULL; - kfree(elr); -} - -static void ext4_unregister_li_request(struct super_block *sb) -{ - mutex_lock(&ext4_li_mtx); - if (!ext4_li_info) { - mutex_unlock(&ext4_li_mtx); - return; - } - - mutex_lock(&ext4_li_info->li_list_mtx); - ext4_remove_li_request(EXT4_SB(sb)->s_li_request); - mutex_unlock(&ext4_li_info->li_list_mtx); - mutex_unlock(&ext4_li_mtx); -} - -static struct task_struct *ext4_lazyinit_task; - -/* - * This is the function where ext4lazyinit thread lives. It walks - * through the request list searching for next scheduled filesystem. - * When such a fs is found, run the lazy initialization request - * (ext4_rn_li_request) and keep track of the time spend in this - * function. Based on that time we compute next schedule time of - * the request. When walking through the list is complete, compute - * next waking time and put itself into sleep. - */ -static int ext4_lazyinit_thread(void *arg) -{ - struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; - struct list_head *pos, *n; - struct ext4_li_request *elr; - unsigned long next_wakeup, cur; - - BUG_ON(NULL == eli); - -cont_thread: - while (true) { - next_wakeup = MAX_JIFFY_OFFSET; - - mutex_lock(&eli->li_list_mtx); - if (list_empty(&eli->li_request_list)) { - mutex_unlock(&eli->li_list_mtx); - goto exit_thread; - } - - list_for_each_safe(pos, n, &eli->li_request_list) { - elr = list_entry(pos, struct ext4_li_request, - lr_request); - - if (time_after_eq(jiffies, elr->lr_next_sched)) { - if (ext4_run_li_request(elr) != 0) { - /* error, remove the lazy_init job */ - ext4_remove_li_request(elr); - continue; - } - } - - if (time_before(elr->lr_next_sched, next_wakeup)) - next_wakeup = elr->lr_next_sched; - } - mutex_unlock(&eli->li_list_mtx); - - try_to_freeze(); - - cur = jiffies; - if ((time_after_eq(cur, next_wakeup)) || - (MAX_JIFFY_OFFSET == next_wakeup)) { - cond_resched(); - continue; - } - - schedule_timeout_interruptible(next_wakeup - cur); - - if (kthread_should_stop()) { - ext4_clear_request_list(); - goto exit_thread; - } - } - -exit_thread: - /* - * It looks like the request list is empty, but we need - * to check it under the li_list_mtx lock, to prevent any - * additions into it, and of course we should lock ext4_li_mtx - * to atomically free the list and ext4_li_info, because at - * this point another ext4 filesystem could be registering - * new one. - */ - mutex_lock(&ext4_li_mtx); - mutex_lock(&eli->li_list_mtx); - if (!list_empty(&eli->li_request_list)) { - mutex_unlock(&eli->li_list_mtx); - mutex_unlock(&ext4_li_mtx); - goto cont_thread; - } - mutex_unlock(&eli->li_list_mtx); - kfree(ext4_li_info); - ext4_li_info = NULL; - mutex_unlock(&ext4_li_mtx); - - return 0; -} - -static void ext4_clear_request_list(void) -{ - struct list_head *pos, *n; - struct ext4_li_request *elr; - - mutex_lock(&ext4_li_info->li_list_mtx); - list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { - elr = list_entry(pos, struct ext4_li_request, - lr_request); - ext4_remove_li_request(elr); - } - mutex_unlock(&ext4_li_info->li_list_mtx); -} - -static int ext4_run_lazyinit_thread(void) -{ - ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, - ext4_li_info, "ext4lazyinit"); - if (IS_ERR(ext4_lazyinit_task)) { - int err = PTR_ERR(ext4_lazyinit_task); - ext4_clear_request_list(); - kfree(ext4_li_info); - ext4_li_info = NULL; - printk(KERN_CRIT "EXT4-fs: error %d creating inode table " - "initialization thread\n", - err); - return err; - } - ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; - return 0; -} - -/* - * Check whether it make sense to run itable init. thread or not. - * If there is at least one uninitialized inode table, return - * corresponding group number, else the loop goes through all - * groups and return total number of groups. - */ -static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) -{ - ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; - struct ext4_group_desc *gdp = NULL; - - for (group = 0; group < ngroups; group++) { - gdp = ext4_get_group_desc(sb, group, NULL); - if (!gdp) - continue; - - if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) - break; - } - - return group; -} - -static int ext4_li_info_new(void) -{ - struct ext4_lazy_init *eli = NULL; - - eli = kzalloc(sizeof(*eli), GFP_KERNEL); - if (!eli) - return -ENOMEM; - - INIT_LIST_HEAD(&eli->li_request_list); - mutex_init(&eli->li_list_mtx); - - eli->li_state |= EXT4_LAZYINIT_QUIT; - - ext4_li_info = eli; - - return 0; -} - -static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, - ext4_group_t start) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_li_request *elr; - unsigned long rnd; - - elr = kzalloc(sizeof(*elr), GFP_KERNEL); - if (!elr) - return NULL; - - elr->lr_super = sb; - elr->lr_sbi = sbi; - elr->lr_next_group = start; - - /* - * Randomize first schedule time of the request to - * spread the inode table initialization requests - * better. - */ - get_random_bytes(&rnd, sizeof(rnd)); - elr->lr_next_sched = jiffies + (unsigned long)rnd % - (EXT4_DEF_LI_MAX_START_DELAY * HZ); - - return elr; -} - -static int ext4_register_li_request(struct super_block *sb, - ext4_group_t first_not_zeroed) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_li_request *elr; - ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; - int ret = 0; - - if (sbi->s_li_request != NULL) { - /* - * Reset timeout so it can be computed again, because - * s_li_wait_mult might have changed. - */ - sbi->s_li_request->lr_timeout = 0; - return 0; - } - - if (first_not_zeroed == ngroups || - (sb->s_flags & MS_RDONLY) || - !test_opt(sb, INIT_INODE_TABLE)) - return 0; - - elr = ext4_li_request_new(sb, first_not_zeroed); - if (!elr) - return -ENOMEM; - - mutex_lock(&ext4_li_mtx); - - if (NULL == ext4_li_info) { - ret = ext4_li_info_new(); - if (ret) - goto out; - } - - mutex_lock(&ext4_li_info->li_list_mtx); - list_add(&elr->lr_request, &ext4_li_info->li_request_list); - mutex_unlock(&ext4_li_info->li_list_mtx); - - sbi->s_li_request = elr; - /* - * set elr to NULL here since it has been inserted to - * the request_list and the removal and free of it is - * handled by ext4_clear_request_list from now on. - */ - elr = NULL; - - if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { - ret = ext4_run_lazyinit_thread(); - if (ret) - goto out; - } -out: - mutex_unlock(&ext4_li_mtx); - if (ret) - kfree(elr); - return ret; -} - -/* - * We do not need to lock anything since this is called on - * module unload. - */ -static void ext4_destroy_lazyinit_thread(void) -{ - /* - * If thread exited earlier - * there's nothing to be done. - */ - if (!ext4_li_info || !ext4_lazyinit_task) - return; - - kthread_stop(ext4_lazyinit_task); -} - -static int ext4_fill_super(struct super_block *sb, void *data, int silent) -{ - char *orig_data = kstrdup(data, GFP_KERNEL); - struct buffer_head *bh; - struct ext4_super_block *es = NULL; - struct ext4_sb_info *sbi; - ext4_fsblk_t block; - ext4_fsblk_t sb_block = get_sb_block(&data); - ext4_fsblk_t logical_sb_block; - unsigned long offset = 0; - unsigned long journal_devnum = 0; - unsigned long def_mount_opts; - struct inode *root; - char *cp; - const char *descr; - int ret = -ENOMEM; - int blocksize, clustersize; - unsigned int db_count; - unsigned int i; - int needs_recovery, has_huge_files, has_bigalloc; - __u64 blocks_count; - int err; - unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; - ext4_group_t first_not_zeroed; - - sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); - if (!sbi) - goto out_free_orig; - - sbi->s_blockgroup_lock = - kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); - if (!sbi->s_blockgroup_lock) { - kfree(sbi); - goto out_free_orig; - } - sb->s_fs_info = sbi; - sbi->s_mount_opt = 0; - sbi->s_resuid = EXT4_DEF_RESUID; - sbi->s_resgid = EXT4_DEF_RESGID; - sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; - sbi->s_sb_block = sb_block; - if (sb->s_bdev->bd_part) - sbi->s_sectors_written_start = - part_stat_read(sb->s_bdev->bd_part, sectors[1]); - - /* Cleanup superblock name */ - for (cp = sb->s_id; (cp = strchr(cp, '/'));) - *cp = '!'; - - ret = -EINVAL; - blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); - if (!blocksize) { - ext4_msg(sb, KERN_ERR, "unable to set blocksize"); - goto out_fail; - } - - /* - * The ext4 superblock will not be buffer aligned for other than 1kB - * block sizes. We need to calculate the offset from buffer start. - */ - if (blocksize != EXT4_MIN_BLOCK_SIZE) { - logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; - offset = do_div(logical_sb_block, blocksize); - } else { - logical_sb_block = sb_block; - } - - if (!(bh = sb_bread(sb, logical_sb_block))) { - ext4_msg(sb, KERN_ERR, "unable to read superblock"); - goto out_fail; - } - /* - * Note: s_es must be initialized as soon as possible because - * some ext4 macro-instructions depend on its value - */ - es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); - sbi->s_es = es; - sb->s_magic = le16_to_cpu(es->s_magic); - if (sb->s_magic != EXT4_SUPER_MAGIC) - goto cantfind_ext4; - sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); - - /* Set defaults before we parse the mount options */ - def_mount_opts = le32_to_cpu(es->s_default_mount_opts); - set_opt(sb, INIT_INODE_TABLE); - if (def_mount_opts & EXT4_DEFM_DEBUG) - set_opt(sb, DEBUG); - if (def_mount_opts & EXT4_DEFM_BSDGROUPS) - set_opt(sb, GRPID); - if (def_mount_opts & EXT4_DEFM_UID16) - set_opt(sb, NO_UID32); - /* xattr user namespace & acls are now defaulted on */ -#ifdef CONFIG_EXT4_FS_XATTR - set_opt(sb, XATTR_USER); -#endif -#ifdef CONFIG_EXT4_FS_POSIX_ACL - set_opt(sb, POSIX_ACL); -#endif - set_opt(sb, MBLK_IO_SUBMIT); - if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) - set_opt(sb, JOURNAL_DATA); - else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) - set_opt(sb, ORDERED_DATA); - else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) - set_opt(sb, WRITEBACK_DATA); - - if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) - set_opt(sb, ERRORS_PANIC); - else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) - set_opt(sb, ERRORS_CONT); - else - set_opt(sb, ERRORS_RO); - if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) - set_opt(sb, BLOCK_VALIDITY); - if (def_mount_opts & EXT4_DEFM_DISCARD) - set_opt(sb, DISCARD); - - sbi->s_resuid = le16_to_cpu(es->s_def_resuid); - sbi->s_resgid = le16_to_cpu(es->s_def_resgid); - sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; - sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; - sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; - - if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) - set_opt(sb, BARRIER); - - /* - * enable delayed allocation by default - * Use -o nodelalloc to turn it off - */ - if (!IS_EXT3_SB(sb) && - ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) - set_opt(sb, DELALLOC); - - /* - * set default s_li_wait_mult for lazyinit, for the case there is - * no mount option specified. - */ - sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; - - if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, - &journal_devnum, &journal_ioprio, 0)) { - ext4_msg(sb, KERN_WARNING, - "failed to parse options in superblock: %s", - sbi->s_es->s_mount_opts); - } - sbi->s_def_mount_opt = sbi->s_mount_opt; - if (!parse_options((char *) data, sb, &journal_devnum, - &journal_ioprio, 0)) - goto failed_mount; - - if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { - printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " - "with data=journal disables delayed " - "allocation and O_DIRECT support!\n"); - if (test_opt2(sb, EXPLICIT_DELALLOC)) { - ext4_msg(sb, KERN_ERR, "can't mount with " - "both data=journal and delalloc"); - goto failed_mount; - } - if (test_opt(sb, DIOREAD_NOLOCK)) { - ext4_msg(sb, KERN_ERR, "can't mount with " - "both data=journal and delalloc"); - goto failed_mount; - } - if (test_opt(sb, DELALLOC)) - clear_opt(sb, DELALLOC); - } - - blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); - if (test_opt(sb, DIOREAD_NOLOCK)) { - if (blocksize < PAGE_SIZE) { - ext4_msg(sb, KERN_ERR, "can't mount with " - "dioread_nolock if block size != PAGE_SIZE"); - goto failed_mount; - } - } - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); - - if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && - (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || - EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || - EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) - ext4_msg(sb, KERN_WARNING, - "feature flags set on rev 0 fs, " - "running e2fsck is recommended"); - - if (IS_EXT2_SB(sb)) { - if (ext2_feature_set_ok(sb)) - ext4_msg(sb, KERN_INFO, "mounting ext2 file system " - "using the ext4 subsystem"); - else { - ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " - "to feature incompatibilities"); - goto failed_mount; - } - } - - if (IS_EXT3_SB(sb)) { - if (ext3_feature_set_ok(sb)) - ext4_msg(sb, KERN_INFO, "mounting ext3 file system " - "using the ext4 subsystem"); - else { - ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " - "to feature incompatibilities"); - goto failed_mount; - } - } - - /* - * Check feature flags regardless of the revision level, since we - * previously didn't change the revision level when setting the flags, - * so there is a chance incompat flags are set on a rev 0 filesystem. - */ - if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) - goto failed_mount; - - if (blocksize < EXT4_MIN_BLOCK_SIZE || - blocksize > EXT4_MAX_BLOCK_SIZE) { - ext4_msg(sb, KERN_ERR, - "Unsupported filesystem blocksize %d", blocksize); - goto failed_mount; - } - - if (sb->s_blocksize != blocksize) { - /* Validate the filesystem blocksize */ - if (!sb_set_blocksize(sb, blocksize)) { - ext4_msg(sb, KERN_ERR, "bad block size %d", - blocksize); - goto failed_mount; - } - - brelse(bh); - logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; - offset = do_div(logical_sb_block, blocksize); - bh = sb_bread(sb, logical_sb_block); - if (!bh) { - ext4_msg(sb, KERN_ERR, - "Can't read superblock on 2nd try"); - goto failed_mount; - } - es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); - sbi->s_es = es; - if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { - ext4_msg(sb, KERN_ERR, - "Magic mismatch, very weird!"); - goto failed_mount; - } - } - - has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, - EXT4_FEATURE_RO_COMPAT_HUGE_FILE); - sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, - has_huge_files); - sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); - - if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { - sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; - sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; - } else { - sbi->s_inode_size = le16_to_cpu(es->s_inode_size); - sbi->s_first_ino = le32_to_cpu(es->s_first_ino); - if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || - (!is_power_of_2(sbi->s_inode_size)) || - (sbi->s_inode_size > blocksize)) { - ext4_msg(sb, KERN_ERR, - "unsupported inode size: %d", - sbi->s_inode_size); - goto failed_mount; - } - if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) - sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); - } - - sbi->s_desc_size = le16_to_cpu(es->s_desc_size); - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { - if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || - sbi->s_desc_size > EXT4_MAX_DESC_SIZE || - !is_power_of_2(sbi->s_desc_size)) { - ext4_msg(sb, KERN_ERR, - "unsupported descriptor size %lu", - sbi->s_desc_size); - goto failed_mount; - } - } else - sbi->s_desc_size = EXT4_MIN_DESC_SIZE; - - sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); - sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); - if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) - goto cantfind_ext4; - - sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); - if (sbi->s_inodes_per_block == 0) - goto cantfind_ext4; - sbi->s_itb_per_group = sbi->s_inodes_per_group / - sbi->s_inodes_per_block; - sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); - sbi->s_sbh = bh; - sbi->s_mount_state = le16_to_cpu(es->s_state); - sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); - sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); - - for (i = 0; i < 4; i++) - sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); - sbi->s_def_hash_version = es->s_def_hash_version; - i = le32_to_cpu(es->s_flags); - if (i & EXT2_FLAGS_UNSIGNED_HASH) - sbi->s_hash_unsigned = 3; - else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { -#ifdef __CHAR_UNSIGNED__ - es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); - sbi->s_hash_unsigned = 3; -#else - es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); -#endif - } - - /* Handle clustersize */ - clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); - has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb, - EXT4_FEATURE_RO_COMPAT_BIGALLOC); - if (has_bigalloc) { - if (clustersize < blocksize) { - ext4_msg(sb, KERN_ERR, - "cluster size (%d) smaller than " - "block size (%d)", clustersize, blocksize); - goto failed_mount; - } - sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - - le32_to_cpu(es->s_log_block_size); - sbi->s_clusters_per_group = - le32_to_cpu(es->s_clusters_per_group); - if (sbi->s_clusters_per_group > blocksize * 8) { - ext4_msg(sb, KERN_ERR, - "#clusters per group too big: %lu", - sbi->s_clusters_per_group); - goto failed_mount; - } - if (sbi->s_blocks_per_group != - (sbi->s_clusters_per_group * (clustersize / blocksize))) { - ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " - "clusters per group (%lu) inconsistent", - sbi->s_blocks_per_group, - sbi->s_clusters_per_group); - goto failed_mount; - } - } else { - if (clustersize != blocksize) { - ext4_warning(sb, "fragment/cluster size (%d) != " - "block size (%d)", clustersize, - blocksize); - clustersize = blocksize; - } - if (sbi->s_blocks_per_group > blocksize * 8) { - ext4_msg(sb, KERN_ERR, - "#blocks per group too big: %lu", - sbi->s_blocks_per_group); - goto failed_mount; - } - sbi->s_clusters_per_group = sbi->s_blocks_per_group; - sbi->s_cluster_bits = 0; - } - sbi->s_cluster_ratio = clustersize / blocksize; - - if (sbi->s_inodes_per_group > blocksize * 8) { - ext4_msg(sb, KERN_ERR, - "#inodes per group too big: %lu", - sbi->s_inodes_per_group); - goto failed_mount; - } - - /* - * Test whether we have more sectors than will fit in sector_t, - * and whether the max offset is addressable by the page cache. - */ - err = generic_check_addressable(sb->s_blocksize_bits, - ext4_blocks_count(es)); - if (err) { - ext4_msg(sb, KERN_ERR, "filesystem" - " too large to mount safely on this system"); - if (sizeof(sector_t) < 8) - ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); - ret = err; - goto failed_mount; - } - - if (EXT4_BLOCKS_PER_GROUP(sb) == 0) - goto cantfind_ext4; - - /* check blocks count against device size */ - blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; - if (blocks_count && ext4_blocks_count(es) > blocks_count) { - ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " - "exceeds size of device (%llu blocks)", - ext4_blocks_count(es), blocks_count); - goto failed_mount; - } - - /* - * It makes no sense for the first data block to be beyond the end - * of the filesystem. - */ - if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { - ext4_msg(sb, KERN_WARNING, "bad geometry: first data " - "block %u is beyond end of filesystem (%llu)", - le32_to_cpu(es->s_first_data_block), - ext4_blocks_count(es)); - goto failed_mount; - } - blocks_count = (ext4_blocks_count(es) - - le32_to_cpu(es->s_first_data_block) + - EXT4_BLOCKS_PER_GROUP(sb) - 1); - do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); - if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { - ext4_msg(sb, KERN_WARNING, "groups count too large: %u " - "(block count %llu, first data block %u, " - "blocks per group %lu)", sbi->s_groups_count, - ext4_blocks_count(es), - le32_to_cpu(es->s_first_data_block), - EXT4_BLOCKS_PER_GROUP(sb)); - goto failed_mount; - } - sbi->s_groups_count = blocks_count; - sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, - (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); - db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / - EXT4_DESC_PER_BLOCK(sb); - sbi->s_group_desc = ext4_kvmalloc(db_count * - sizeof(struct buffer_head *), - GFP_KERNEL); - if (sbi->s_group_desc == NULL) { - ext4_msg(sb, KERN_ERR, "not enough memory"); - goto failed_mount; - } - - if (ext4_proc_root) - sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); - - if (sbi->s_proc) - proc_create_data("options", S_IRUGO, sbi->s_proc, - &ext4_seq_options_fops, sb); - - bgl_lock_init(sbi->s_blockgroup_lock); - - for (i = 0; i < db_count; i++) { - block = descriptor_loc(sb, logical_sb_block, i); - sbi->s_group_desc[i] = sb_bread(sb, block); - if (!sbi->s_group_desc[i]) { - ext4_msg(sb, KERN_ERR, - "can't read group descriptor %d", i); - db_count = i; - goto failed_mount2; - } - } - if (!ext4_check_descriptors(sb, &first_not_zeroed)) { - ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); - goto failed_mount2; - } - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) - if (!ext4_fill_flex_info(sb)) { - ext4_msg(sb, KERN_ERR, - "unable to initialize " - "flex_bg meta info!"); - goto failed_mount2; - } - - sbi->s_gdb_count = db_count; - get_random_bytes(&sbi->s_next_generation, sizeof(u32)); - spin_lock_init(&sbi->s_next_gen_lock); - - init_timer(&sbi->s_err_report); - sbi->s_err_report.function = print_daily_error_info; - sbi->s_err_report.data = (unsigned long) sb; - - err = percpu_counter_init(&sbi->s_freeclusters_counter, - ext4_count_free_clusters(sb)); - if (!err) { - err = percpu_counter_init(&sbi->s_freeinodes_counter, - ext4_count_free_inodes(sb)); - } - if (!err) { - err = percpu_counter_init(&sbi->s_dirs_counter, - ext4_count_dirs(sb)); - } - if (!err) { - err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0); - } - if (err) { - ext4_msg(sb, KERN_ERR, "insufficient memory"); - goto failed_mount3; - } - - sbi->s_stripe = ext4_get_stripe_size(sbi); - sbi->s_max_writeback_mb_bump = 128; - - /* - * set up enough so that it can read an inode - */ - if (!test_opt(sb, NOLOAD) && - EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) - sb->s_op = &ext4_sops; - else - sb->s_op = &ext4_nojournal_sops; - sb->s_export_op = &ext4_export_ops; - sb->s_xattr = ext4_xattr_handlers; -#ifdef CONFIG_QUOTA - sb->s_qcop = &ext4_qctl_operations; - sb->dq_op = &ext4_quota_operations; -#endif - memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); - - INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ - mutex_init(&sbi->s_orphan_lock); - sbi->s_resize_flags = 0; - - sb->s_root = NULL; - - needs_recovery = (es->s_last_orphan != 0 || - EXT4_HAS_INCOMPAT_FEATURE(sb, - EXT4_FEATURE_INCOMPAT_RECOVER)); - - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && - !(sb->s_flags & MS_RDONLY)) - if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) - goto failed_mount3; - - /* - * The first inode we look at is the journal inode. Don't try - * root first: it may be modified in the journal! - */ - if (!test_opt(sb, NOLOAD) && - EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { - if (ext4_load_journal(sb, es, journal_devnum)) - goto failed_mount3; - } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && - EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { - ext4_msg(sb, KERN_ERR, "required journal recovery " - "suppressed and not mounted read-only"); - goto failed_mount_wq; - } else { - clear_opt(sb, DATA_FLAGS); - sbi->s_journal = NULL; - needs_recovery = 0; - goto no_journal; - } - - if (ext4_blocks_count(es) > 0xffffffffULL && - !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, - JBD2_FEATURE_INCOMPAT_64BIT)) { - ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); - goto failed_mount_wq; - } - - if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { - jbd2_journal_set_features(sbi->s_journal, - JBD2_FEATURE_COMPAT_CHECKSUM, 0, - JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); - } else if (test_opt(sb, JOURNAL_CHECKSUM)) { - jbd2_journal_set_features(sbi->s_journal, - JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); - jbd2_journal_clear_features(sbi->s_journal, 0, 0, - JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); - } else { - jbd2_journal_clear_features(sbi->s_journal, - JBD2_FEATURE_COMPAT_CHECKSUM, 0, - JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); - } - - /* We have now updated the journal if required, so we can - * validate the data journaling mode. */ - switch (test_opt(sb, DATA_FLAGS)) { - case 0: - /* No mode set, assume a default based on the journal - * capabilities: ORDERED_DATA if the journal can - * cope, else JOURNAL_DATA - */ - if (jbd2_journal_check_available_features - (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) - set_opt(sb, ORDERED_DATA); - else - set_opt(sb, JOURNAL_DATA); - break; - - case EXT4_MOUNT_ORDERED_DATA: - case EXT4_MOUNT_WRITEBACK_DATA: - if (!jbd2_journal_check_available_features - (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { - ext4_msg(sb, KERN_ERR, "Journal does not support " - "requested data journaling mode"); - goto failed_mount_wq; - } - default: - break; - } - set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); - - sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; - - /* - * The journal may have updated the bg summary counts, so we - * need to update the global counters. - */ - percpu_counter_set(&sbi->s_freeclusters_counter, - ext4_count_free_clusters(sb)); - percpu_counter_set(&sbi->s_freeinodes_counter, - ext4_count_free_inodes(sb)); - percpu_counter_set(&sbi->s_dirs_counter, - ext4_count_dirs(sb)); - percpu_counter_set(&sbi->s_dirtyclusters_counter, 0); - -no_journal: - /* - * The maximum number of concurrent works can be high and - * concurrency isn't really necessary. Limit it to 1. - */ - EXT4_SB(sb)->dio_unwritten_wq = - alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); - if (!EXT4_SB(sb)->dio_unwritten_wq) { - printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); - goto failed_mount_wq; - } - - /* - * The jbd2_journal_load will have done any necessary log recovery, - * so we can safely mount the rest of the filesystem now. - */ - - root = ext4_iget(sb, EXT4_ROOT_INO); - if (IS_ERR(root)) { - ext4_msg(sb, KERN_ERR, "get root inode failed"); - ret = PTR_ERR(root); - root = NULL; - goto failed_mount4; - } - if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { - ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); - iput(root); - goto failed_mount4; - } - sb->s_root = d_make_root(root); - if (!sb->s_root) { - ext4_msg(sb, KERN_ERR, "get root dentry failed"); - ret = -ENOMEM; - goto failed_mount4; - } - - if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) - sb->s_flags |= MS_RDONLY; - - /* determine the minimum size of new large inodes, if present */ - if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { - sbi->s_want_extra_isize = sizeof(struct ext4_inode) - - EXT4_GOOD_OLD_INODE_SIZE; - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, - EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { - if (sbi->s_want_extra_isize < - le16_to_cpu(es->s_want_extra_isize)) - sbi->s_want_extra_isize = - le16_to_cpu(es->s_want_extra_isize); - if (sbi->s_want_extra_isize < - le16_to_cpu(es->s_min_extra_isize)) - sbi->s_want_extra_isize = - le16_to_cpu(es->s_min_extra_isize); - } - } - /* Check if enough inode space is available */ - if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > - sbi->s_inode_size) { - sbi->s_want_extra_isize = sizeof(struct ext4_inode) - - EXT4_GOOD_OLD_INODE_SIZE; - ext4_msg(sb, KERN_INFO, "required extra inode space not" - "available"); - } - - err = ext4_setup_system_zone(sb); - if (err) { - ext4_msg(sb, KERN_ERR, "failed to initialize system " - "zone (%d)", err); - goto failed_mount4a; - } - - ext4_ext_init(sb); - err = ext4_mb_init(sb, needs_recovery); - if (err) { - ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", - err); - goto failed_mount5; - } - - err = ext4_register_li_request(sb, first_not_zeroed); - if (err) - goto failed_mount6; - - sbi->s_kobj.kset = ext4_kset; - init_completion(&sbi->s_kobj_unregister); - err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, - "%s", sb->s_id); - if (err) - goto failed_mount7; - - EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; - ext4_orphan_cleanup(sb, es); - EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; - if (needs_recovery) { - ext4_msg(sb, KERN_INFO, "recovery complete"); - ext4_mark_recovery_complete(sb, es); - } - if (EXT4_SB(sb)->s_journal) { - if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) - descr = " journalled data mode"; - else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) - descr = " ordered data mode"; - else - descr = " writeback data mode"; - } else - descr = "out journal"; - - ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " - "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, - *sbi->s_es->s_mount_opts ? "; " : "", orig_data); - - if (es->s_error_count) - mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ - - kfree(orig_data); - return 0; - -cantfind_ext4: - if (!silent) - ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); - goto failed_mount; - -failed_mount7: - ext4_unregister_li_request(sb); -failed_mount6: - ext4_mb_release(sb); -failed_mount5: - ext4_ext_release(sb); - ext4_release_system_zone(sb); -failed_mount4a: - dput(sb->s_root); - sb->s_root = NULL; -failed_mount4: - ext4_msg(sb, KERN_ERR, "mount failed"); - destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); -failed_mount_wq: - if (sbi->s_journal) { - jbd2_journal_destroy(sbi->s_journal); - sbi->s_journal = NULL; - } -failed_mount3: - del_timer(&sbi->s_err_report); - if (sbi->s_flex_groups) - ext4_kvfree(sbi->s_flex_groups); - percpu_counter_destroy(&sbi->s_freeclusters_counter); - percpu_counter_destroy(&sbi->s_freeinodes_counter); - percpu_counter_destroy(&sbi->s_dirs_counter); - percpu_counter_destroy(&sbi->s_dirtyclusters_counter); - if (sbi->s_mmp_tsk) - kthread_stop(sbi->s_mmp_tsk); -failed_mount2: - for (i = 0; i < db_count; i++) - brelse(sbi->s_group_desc[i]); - ext4_kvfree(sbi->s_group_desc); -failed_mount: - if (sbi->s_proc) { - remove_proc_entry("options", sbi->s_proc); - remove_proc_entry(sb->s_id, ext4_proc_root); - } -#ifdef CONFIG_QUOTA - for (i = 0; i < MAXQUOTAS; i++) - kfree(sbi->s_qf_names[i]); -#endif - ext4_blkdev_remove(sbi); - brelse(bh); -out_fail: - sb->s_fs_info = NULL; - kfree(sbi->s_blockgroup_lock); - kfree(sbi); -out_free_orig: - kfree(orig_data); - return ret; -} - -/* - * Setup any per-fs journal parameters now. We'll do this both on - * initial mount, once the journal has been initialised but before we've - * done any recovery; and again on any subsequent remount. - */ -static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - - journal->j_commit_interval = sbi->s_commit_interval; - journal->j_min_batch_time = sbi->s_min_batch_time; - journal->j_max_batch_time = sbi->s_max_batch_time; - - write_lock(&journal->j_state_lock); - if (test_opt(sb, BARRIER)) - journal->j_flags |= JBD2_BARRIER; - else - journal->j_flags &= ~JBD2_BARRIER; - if (test_opt(sb, DATA_ERR_ABORT)) - journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; - else - journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; - write_unlock(&journal->j_state_lock); -} - -static journal_t *ext4_get_journal(struct super_block *sb, - unsigned int journal_inum) -{ - struct inode *journal_inode; - journal_t *journal; - - BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); - - /* First, test for the existence of a valid inode on disk. Bad - * things happen if we iget() an unused inode, as the subsequent - * iput() will try to delete it. */ - - journal_inode = ext4_iget(sb, journal_inum); - if (IS_ERR(journal_inode)) { - ext4_msg(sb, KERN_ERR, "no journal found"); - return NULL; - } - if (!journal_inode->i_nlink) { - make_bad_inode(journal_inode); - iput(journal_inode); - ext4_msg(sb, KERN_ERR, "journal inode is deleted"); - return NULL; - } - - jbd_debug(2, "Journal inode found at %p: %lld bytes\n", - journal_inode, journal_inode->i_size); - if (!S_ISREG(journal_inode->i_mode)) { - ext4_msg(sb, KERN_ERR, "invalid journal inode"); - iput(journal_inode); - return NULL; - } - - journal = jbd2_journal_init_inode(journal_inode); - if (!journal) { - ext4_msg(sb, KERN_ERR, "Could not load journal inode"); - iput(journal_inode); - return NULL; - } - journal->j_private = sb; - ext4_init_journal_params(sb, journal); - return journal; -} - -static journal_t *ext4_get_dev_journal(struct super_block *sb, - dev_t j_dev) -{ - struct buffer_head *bh; - journal_t *journal; - ext4_fsblk_t start; - ext4_fsblk_t len; - int hblock, blocksize; - ext4_fsblk_t sb_block; - unsigned long offset; - struct ext4_super_block *es; - struct block_device *bdev; - - BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); - - bdev = ext4_blkdev_get(j_dev, sb); - if (bdev == NULL) - return NULL; - - blocksize = sb->s_blocksize; - hblock = bdev_logical_block_size(bdev); - if (blocksize < hblock) { - ext4_msg(sb, KERN_ERR, - "blocksize too small for journal device"); - goto out_bdev; - } - - sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; - offset = EXT4_MIN_BLOCK_SIZE % blocksize; - set_blocksize(bdev, blocksize); - if (!(bh = __bread(bdev, sb_block, blocksize))) { - ext4_msg(sb, KERN_ERR, "couldn't read superblock of " - "external journal"); - goto out_bdev; - } - - es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); - if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || - !(le32_to_cpu(es->s_feature_incompat) & - EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { - ext4_msg(sb, KERN_ERR, "external journal has " - "bad superblock"); - brelse(bh); - goto out_bdev; - } - - if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { - ext4_msg(sb, KERN_ERR, "journal UUID does not match"); - brelse(bh); - goto out_bdev; - } - - len = ext4_blocks_count(es); - start = sb_block + 1; - brelse(bh); /* we're done with the superblock */ - - journal = jbd2_journal_init_dev(bdev, sb->s_bdev, - start, len, blocksize); - if (!journal) { - ext4_msg(sb, KERN_ERR, "failed to create device journal"); - goto out_bdev; - } - journal->j_private = sb; - ll_rw_block(READ, 1, &journal->j_sb_buffer); - wait_on_buffer(journal->j_sb_buffer); - if (!buffer_uptodate(journal->j_sb_buffer)) { - ext4_msg(sb, KERN_ERR, "I/O error on journal device"); - goto out_journal; - } - if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { - ext4_msg(sb, KERN_ERR, "External journal has more than one " - "user (unsupported) - %d", - be32_to_cpu(journal->j_superblock->s_nr_users)); - goto out_journal; - } - EXT4_SB(sb)->journal_bdev = bdev; - ext4_init_journal_params(sb, journal); - return journal; - -out_journal: - jbd2_journal_destroy(journal); -out_bdev: - ext4_blkdev_put(bdev); - return NULL; -} - -static int ext4_load_journal(struct super_block *sb, - struct ext4_super_block *es, - unsigned long journal_devnum) -{ - journal_t *journal; - unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); - dev_t journal_dev; - int err = 0; - int really_read_only; - - BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); - - if (journal_devnum && - journal_devnum != le32_to_cpu(es->s_journal_dev)) { - ext4_msg(sb, KERN_INFO, "external journal device major/minor " - "numbers have changed"); - journal_dev = new_decode_dev(journal_devnum); - } else - journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); - - really_read_only = bdev_read_only(sb->s_bdev); - - /* - * Are we loading a blank journal or performing recovery after a - * crash? For recovery, we need to check in advance whether we - * can get read-write access to the device. - */ - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { - if (sb->s_flags & MS_RDONLY) { - ext4_msg(sb, KERN_INFO, "INFO: recovery " - "required on readonly filesystem"); - if (really_read_only) { - ext4_msg(sb, KERN_ERR, "write access " - "unavailable, cannot proceed"); - return -EROFS; - } - ext4_msg(sb, KERN_INFO, "write access will " - "be enabled during recovery"); - } - } - - if (journal_inum && journal_dev) { - ext4_msg(sb, KERN_ERR, "filesystem has both journal " - "and inode journals!"); - return -EINVAL; - } - - if (journal_inum) { - if (!(journal = ext4_get_journal(sb, journal_inum))) - return -EINVAL; - } else { - if (!(journal = ext4_get_dev_journal(sb, journal_dev))) - return -EINVAL; - } - - if (!(journal->j_flags & JBD2_BARRIER)) - ext4_msg(sb, KERN_INFO, "barriers disabled"); - - if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) - err = jbd2_journal_wipe(journal, !really_read_only); - if (!err) { - char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); - if (save) - memcpy(save, ((char *) es) + - EXT4_S_ERR_START, EXT4_S_ERR_LEN); - err = jbd2_journal_load(journal); - if (save) - memcpy(((char *) es) + EXT4_S_ERR_START, - save, EXT4_S_ERR_LEN); - kfree(save); - } - - if (err) { - ext4_msg(sb, KERN_ERR, "error loading journal"); - jbd2_journal_destroy(journal); - return err; - } - - EXT4_SB(sb)->s_journal = journal; - ext4_clear_journal_err(sb, es); - - if (!really_read_only && journal_devnum && - journal_devnum != le32_to_cpu(es->s_journal_dev)) { - es->s_journal_dev = cpu_to_le32(journal_devnum); - - /* Make sure we flush the recovery flag to disk. */ - ext4_commit_super(sb, 1); - } - - return 0; -} - -static int ext4_commit_super(struct super_block *sb, int sync) -{ - struct ext4_super_block *es = EXT4_SB(sb)->s_es; - struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; - int error = 0; - - if (!sbh || block_device_ejected(sb)) - return error; - if (buffer_write_io_error(sbh)) { - /* - * Oh, dear. A previous attempt to write the - * superblock failed. This could happen because the - * USB device was yanked out. Or it could happen to - * be a transient write error and maybe the block will - * be remapped. Nothing we can do but to retry the - * write and hope for the best. - */ - ext4_msg(sb, KERN_ERR, "previous I/O error to " - "superblock detected"); - clear_buffer_write_io_error(sbh); - set_buffer_uptodate(sbh); - } - /* - * If the file system is mounted read-only, don't update the - * superblock write time. This avoids updating the superblock - * write time when we are mounting the root file system - * read/only but we need to replay the journal; at that point, - * for people who are east of GMT and who make their clock - * tick in localtime for Windows bug-for-bug compatibility, - * the clock is set in the future, and this will cause e2fsck - * to complain and force a full file system check. - */ - if (!(sb->s_flags & MS_RDONLY)) - es->s_wtime = cpu_to_le32(get_seconds()); - if (sb->s_bdev->bd_part) - es->s_kbytes_written = - cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + - ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - - EXT4_SB(sb)->s_sectors_written_start) >> 1)); - else - es->s_kbytes_written = - cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); - ext4_free_blocks_count_set(es, - EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( - &EXT4_SB(sb)->s_freeclusters_counter))); - es->s_free_inodes_count = - cpu_to_le32(percpu_counter_sum_positive( - &EXT4_SB(sb)->s_freeinodes_counter)); - sb->s_dirt = 0; - BUFFER_TRACE(sbh, "marking dirty"); - mark_buffer_dirty(sbh); - if (sync) { - error = sync_dirty_buffer(sbh); - if (error) - return error; - - error = buffer_write_io_error(sbh); - if (error) { - ext4_msg(sb, KERN_ERR, "I/O error while writing " - "superblock"); - clear_buffer_write_io_error(sbh); - set_buffer_uptodate(sbh); - } - } - return error; -} - -/* - * Have we just finished recovery? If so, and if we are mounting (or - * remounting) the filesystem readonly, then we will end up with a - * consistent fs on disk. Record that fact. - */ -static void ext4_mark_recovery_complete(struct super_block *sb, - struct ext4_super_block *es) -{ - journal_t *journal = EXT4_SB(sb)->s_journal; - - if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { - BUG_ON(journal != NULL); - return; - } - jbd2_journal_lock_updates(journal); - if (jbd2_journal_flush(journal) < 0) - goto out; - - if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && - sb->s_flags & MS_RDONLY) { - EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); - ext4_commit_super(sb, 1); - } - -out: - jbd2_journal_unlock_updates(journal); -} - -/* - * If we are mounting (or read-write remounting) a filesystem whose journal - * has recorded an error from a previous lifetime, move that error to the - * main filesystem now. - */ -static void ext4_clear_journal_err(struct super_block *sb, - struct ext4_super_block *es) -{ - journal_t *journal; - int j_errno; - const char *errstr; - - BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); - - journal = EXT4_SB(sb)->s_journal; - - /* - * Now check for any error status which may have been recorded in the - * journal by a prior ext4_error() or ext4_abort() - */ - - j_errno = jbd2_journal_errno(journal); - if (j_errno) { - char nbuf[16]; - - errstr = ext4_decode_error(sb, j_errno, nbuf); - ext4_warning(sb, "Filesystem error recorded " - "from previous mount: %s", errstr); - ext4_warning(sb, "Marking fs in need of filesystem check."); - - EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; - es->s_state |= cpu_to_le16(EXT4_ERROR_FS); - ext4_commit_super(sb, 1); - - jbd2_journal_clear_err(journal); - } -} - -/* - * Force the running and committing transactions to commit, - * and wait on the commit. - */ -int ext4_force_commit(struct super_block *sb) -{ - journal_t *journal; - int ret = 0; - - if (sb->s_flags & MS_RDONLY) - return 0; - - journal = EXT4_SB(sb)->s_journal; - if (journal) { - vfs_check_frozen(sb, SB_FREEZE_TRANS); - ret = ext4_journal_force_commit(journal); - } - - return ret; -} - -static void ext4_write_super(struct super_block *sb) -{ - lock_super(sb); - ext4_commit_super(sb, 1); - unlock_super(sb); -} - -static int ext4_sync_fs(struct super_block *sb, int wait) -{ - int ret = 0; - tid_t target; - struct ext4_sb_info *sbi = EXT4_SB(sb); - - trace_ext4_sync_fs(sb, wait); - flush_workqueue(sbi->dio_unwritten_wq); - if (jbd2_journal_start_commit(sbi->s_journal, &target)) { - if (wait) - jbd2_log_wait_commit(sbi->s_journal, target); - } - return ret; -} - -/* - * LVM calls this function before a (read-only) snapshot is created. This - * gives us a chance to flush the journal completely and mark the fs clean. - * - * Note that only this function cannot bring a filesystem to be in a clean - * state independently, because ext4 prevents a new handle from being started - * by @sb->s_frozen, which stays in an upper layer. It thus needs help from - * the upper layer. - */ -static int ext4_freeze(struct super_block *sb) -{ - int error = 0; - journal_t *journal; - - if (sb->s_flags & MS_RDONLY) - return 0; - - journal = EXT4_SB(sb)->s_journal; - - /* Now we set up the journal barrier. */ - jbd2_journal_lock_updates(journal); - - /* - * Don't clear the needs_recovery flag if we failed to flush - * the journal. - */ - error = jbd2_journal_flush(journal); - if (error < 0) - goto out; - - /* Journal blocked and flushed, clear needs_recovery flag. */ - EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); - error = ext4_commit_super(sb, 1); -out: - /* we rely on s_frozen to stop further updates */ - jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); - return error; -} - -/* - * Called by LVM after the snapshot is done. We need to reset the RECOVER - * flag here, even though the filesystem is not technically dirty yet. - */ -static int ext4_unfreeze(struct super_block *sb) -{ - if (sb->s_flags & MS_RDONLY) - return 0; - - lock_super(sb); - /* Reset the needs_recovery flag before the fs is unlocked. */ - EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); - ext4_commit_super(sb, 1); - unlock_super(sb); - return 0; -} - -/* - * Structure to save mount options for ext4_remount's benefit - */ -struct ext4_mount_options { - unsigned long s_mount_opt; - unsigned long s_mount_opt2; - uid_t s_resuid; - gid_t s_resgid; - unsigned long s_commit_interval; - u32 s_min_batch_time, s_max_batch_time; -#ifdef CONFIG_QUOTA - int s_jquota_fmt; - char *s_qf_names[MAXQUOTAS]; -#endif -}; - -static int ext4_remount(struct super_block *sb, int *flags, char *data) -{ - struct ext4_super_block *es; - struct ext4_sb_info *sbi = EXT4_SB(sb); - unsigned long old_sb_flags; - struct ext4_mount_options old_opts; - int enable_quota = 0; - ext4_group_t g; - unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; - int err = 0; -#ifdef CONFIG_QUOTA - int i; -#endif - char *orig_data = kstrdup(data, GFP_KERNEL); - - /* Store the original options */ - lock_super(sb); - old_sb_flags = sb->s_flags; - old_opts.s_mount_opt = sbi->s_mount_opt; - old_opts.s_mount_opt2 = sbi->s_mount_opt2; - old_opts.s_resuid = sbi->s_resuid; - old_opts.s_resgid = sbi->s_resgid; - old_opts.s_commit_interval = sbi->s_commit_interval; - old_opts.s_min_batch_time = sbi->s_min_batch_time; - old_opts.s_max_batch_time = sbi->s_max_batch_time; -#ifdef CONFIG_QUOTA - old_opts.s_jquota_fmt = sbi->s_jquota_fmt; - for (i = 0; i < MAXQUOTAS; i++) - old_opts.s_qf_names[i] = sbi->s_qf_names[i]; -#endif - if (sbi->s_journal && sbi->s_journal->j_task->io_context) - journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; - - /* - * Allow the "check" option to be passed as a remount option. - */ - if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { - err = -EINVAL; - goto restore_opts; - } - - if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) - ext4_abort(sb, "Abort forced by user"); - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); - - es = sbi->s_es; - - if (sbi->s_journal) { - ext4_init_journal_params(sb, sbi->s_journal); - set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); - } - - if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { - if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { - err = -EROFS; - goto restore_opts; - } - - if (*flags & MS_RDONLY) { - err = dquot_suspend(sb, -1); - if (err < 0) - goto restore_opts; - - /* - * First of all, the unconditional stuff we have to do - * to disable replay of the journal when we next remount - */ - sb->s_flags |= MS_RDONLY; - - /* - * OK, test if we are remounting a valid rw partition - * readonly, and if so set the rdonly flag and then - * mark the partition as valid again. - */ - if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && - (sbi->s_mount_state & EXT4_VALID_FS)) - es->s_state = cpu_to_le16(sbi->s_mount_state); - - if (sbi->s_journal) - ext4_mark_recovery_complete(sb, es); - } else { - /* Make sure we can mount this feature set readwrite */ - if (!ext4_feature_set_ok(sb, 0)) { - err = -EROFS; - goto restore_opts; - } - /* - * Make sure the group descriptor checksums - * are sane. If they aren't, refuse to remount r/w. - */ - for (g = 0; g < sbi->s_groups_count; g++) { - struct ext4_group_desc *gdp = - ext4_get_group_desc(sb, g, NULL); - - if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { - ext4_msg(sb, KERN_ERR, - "ext4_remount: Checksum for group %u failed (%u!=%u)", - g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), - le16_to_cpu(gdp->bg_checksum)); - err = -EINVAL; - goto restore_opts; - } - } - - /* - * If we have an unprocessed orphan list hanging - * around from a previously readonly bdev mount, - * require a full umount/remount for now. - */ - if (es->s_last_orphan) { - ext4_msg(sb, KERN_WARNING, "Couldn't " - "remount RDWR because of unprocessed " - "orphan inode list. Please " - "umount/remount instead"); - err = -EINVAL; - goto restore_opts; - } - - /* - * Mounting a RDONLY partition read-write, so reread - * and store the current valid flag. (It may have - * been changed by e2fsck since we originally mounted - * the partition.) - */ - if (sbi->s_journal) - ext4_clear_journal_err(sb, es); - sbi->s_mount_state = le16_to_cpu(es->s_state); - if (!ext4_setup_super(sb, es, 0)) - sb->s_flags &= ~MS_RDONLY; - if (EXT4_HAS_INCOMPAT_FEATURE(sb, - EXT4_FEATURE_INCOMPAT_MMP)) - if (ext4_multi_mount_protect(sb, - le64_to_cpu(es->s_mmp_block))) { - err = -EROFS; - goto restore_opts; - } - enable_quota = 1; - } - } - - /* - * Reinitialize lazy itable initialization thread based on - * current settings - */ - if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) - ext4_unregister_li_request(sb); - else { - ext4_group_t first_not_zeroed; - first_not_zeroed = ext4_has_uninit_itable(sb); - ext4_register_li_request(sb, first_not_zeroed); - } - - ext4_setup_system_zone(sb); - if (sbi->s_journal == NULL) - ext4_commit_super(sb, 1); - -#ifdef CONFIG_QUOTA - /* Release old quota file names */ - for (i = 0; i < MAXQUOTAS; i++) - if (old_opts.s_qf_names[i] && - old_opts.s_qf_names[i] != sbi->s_qf_names[i]) - kfree(old_opts.s_qf_names[i]); -#endif - unlock_super(sb); - if (enable_quota) - dquot_resume(sb, -1); - - ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); - kfree(orig_data); - return 0; - -restore_opts: - sb->s_flags = old_sb_flags; - sbi->s_mount_opt = old_opts.s_mount_opt; - sbi->s_mount_opt2 = old_opts.s_mount_opt2; - sbi->s_resuid = old_opts.s_resuid; - sbi->s_resgid = old_opts.s_resgid; - sbi->s_commit_interval = old_opts.s_commit_interval; - sbi->s_min_batch_time = old_opts.s_min_batch_time; - sbi->s_max_batch_time = old_opts.s_max_batch_time; -#ifdef CONFIG_QUOTA - sbi->s_jquota_fmt = old_opts.s_jquota_fmt; - for (i = 0; i < MAXQUOTAS; i++) { - if (sbi->s_qf_names[i] && - old_opts.s_qf_names[i] != sbi->s_qf_names[i]) - kfree(sbi->s_qf_names[i]); - sbi->s_qf_names[i] = old_opts.s_qf_names[i]; - } -#endif - unlock_super(sb); - kfree(orig_data); - return err; -} - -/* - * Note: calculating the overhead so we can be compatible with - * historical BSD practice is quite difficult in the face of - * clusters/bigalloc. This is because multiple metadata blocks from - * different block group can end up in the same allocation cluster. - * Calculating the exact overhead in the face of clustered allocation - * requires either O(all block bitmaps) in memory or O(number of block - * groups**2) in time. We will still calculate the superblock for - * older file systems --- and if we come across with a bigalloc file - * system with zero in s_overhead_clusters the estimate will be close to - * correct especially for very large cluster sizes --- but for newer - * file systems, it's better to calculate this figure once at mkfs - * time, and store it in the superblock. If the superblock value is - * present (even for non-bigalloc file systems), we will use it. - */ -static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct ext4_super_block *es = sbi->s_es; - struct ext4_group_desc *gdp; - u64 fsid; - s64 bfree; - - if (test_opt(sb, MINIX_DF)) { - sbi->s_overhead_last = 0; - } else if (es->s_overhead_clusters) { - sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters); - } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { - ext4_group_t i, ngroups = ext4_get_groups_count(sb); - ext4_fsblk_t overhead = 0; - - /* - * Compute the overhead (FS structures). This is constant - * for a given filesystem unless the number of block groups - * changes so we cache the previous value until it does. - */ - - /* - * All of the blocks before first_data_block are - * overhead - */ - overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); - - /* - * Add the overhead found in each block group - */ - for (i = 0; i < ngroups; i++) { - gdp = ext4_get_group_desc(sb, i, NULL); - overhead += ext4_num_overhead_clusters(sb, i, gdp); - cond_resched(); - } - sbi->s_overhead_last = overhead; - smp_wmb(); - sbi->s_blocks_last = ext4_blocks_count(es); - } - - buf->f_type = EXT4_SUPER_MAGIC; - buf->f_bsize = sb->s_blocksize; - buf->f_blocks = (ext4_blocks_count(es) - - EXT4_C2B(sbi, sbi->s_overhead_last)); - bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - - percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); - /* prevent underflow in case that few free space is available */ - buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); - buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); - if (buf->f_bfree < ext4_r_blocks_count(es)) - buf->f_bavail = 0; - buf->f_files = le32_to_cpu(es->s_inodes_count); - buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); - buf->f_namelen = EXT4_NAME_LEN; - fsid = le64_to_cpup((void *)es->s_uuid) ^ - le64_to_cpup((void *)es->s_uuid + sizeof(u64)); - buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; - buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; - - return 0; -} - -/* Helper function for writing quotas on sync - we need to start transaction - * before quota file is locked for write. Otherwise the are possible deadlocks: - * Process 1 Process 2 - * ext4_create() quota_sync() - * jbd2_journal_start() write_dquot() - * dquot_initialize() down(dqio_mutex) - * down(dqio_mutex) jbd2_journal_start() - * - */ - -#ifdef CONFIG_QUOTA - -static inline struct inode *dquot_to_inode(struct dquot *dquot) -{ - return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; -} - -static int ext4_write_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - struct inode *inode; - - inode = dquot_to_inode(dquot); - handle = ext4_journal_start(inode, - EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_commit(dquot); - err = ext4_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext4_acquire_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - - handle = ext4_journal_start(dquot_to_inode(dquot), - EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_acquire(dquot); - err = ext4_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext4_release_dquot(struct dquot *dquot) -{ - int ret, err; - handle_t *handle; - - handle = ext4_journal_start(dquot_to_inode(dquot), - EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); - if (IS_ERR(handle)) { - /* Release dquot anyway to avoid endless cycle in dqput() */ - dquot_release(dquot); - return PTR_ERR(handle); - } - ret = dquot_release(dquot); - err = ext4_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -static int ext4_mark_dquot_dirty(struct dquot *dquot) -{ - /* Are we journaling quotas? */ - if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || - EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { - dquot_mark_dquot_dirty(dquot); - return ext4_write_dquot(dquot); - } else { - return dquot_mark_dquot_dirty(dquot); - } -} - -static int ext4_write_info(struct super_block *sb, int type) -{ - int ret, err; - handle_t *handle; - - /* Data block + inode block */ - handle = ext4_journal_start(sb->s_root->d_inode, 2); - if (IS_ERR(handle)) - return PTR_ERR(handle); - ret = dquot_commit_info(sb, type); - err = ext4_journal_stop(handle); - if (!ret) - ret = err; - return ret; -} - -/* - * Turn on quotas during mount time - we need to find - * the quota file and such... - */ -static int ext4_quota_on_mount(struct super_block *sb, int type) -{ - return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], - EXT4_SB(sb)->s_jquota_fmt, type); -} - -/* - * Standard function to be called on quota_on - */ -static int ext4_quota_on(struct super_block *sb, int type, int format_id, - struct path *path) -{ - int err; - - if (!test_opt(sb, QUOTA)) - return -EINVAL; - - /* Quotafile not on the same filesystem? */ - if (path->dentry->d_sb != sb) - return -EXDEV; - /* Journaling quota? */ - if (EXT4_SB(sb)->s_qf_names[type]) { - /* Quotafile not in fs root? */ - if (path->dentry->d_parent != sb->s_root) - ext4_msg(sb, KERN_WARNING, - "Quota file not on filesystem root. " - "Journaled quota will not work"); - } - - /* - * When we journal data on quota file, we have to flush journal to see - * all updates to the file when we bypass pagecache... - */ - if (EXT4_SB(sb)->s_journal && - ext4_should_journal_data(path->dentry->d_inode)) { - /* - * We don't need to lock updates but journal_flush() could - * otherwise be livelocked... - */ - jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); - err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); - jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); - if (err) - return err; - } - - return dquot_quota_on(sb, type, format_id, path); -} - -static int ext4_quota_off(struct super_block *sb, int type) -{ - struct inode *inode = sb_dqopt(sb)->files[type]; - handle_t *handle; - - /* Force all delayed allocation blocks to be allocated. - * Caller already holds s_umount sem */ - if (test_opt(sb, DELALLOC)) - sync_filesystem(sb); - - if (!inode) - goto out; - - /* Update modification times of quota files when userspace can - * start looking at them */ - handle = ext4_journal_start(inode, 1); - if (IS_ERR(handle)) - goto out; - inode->i_mtime = inode->i_ctime = CURRENT_TIME; - ext4_mark_inode_dirty(handle, inode); - ext4_journal_stop(handle); - -out: - return dquot_quota_off(sb, type); -} - -/* Read data from quotafile - avoid pagecache and such because we cannot afford - * acquiring the locks... As quota files are never truncated and quota code - * itself serializes the operations (and no one else should touch the files) - * we don't have to be afraid of races */ -static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, - size_t len, loff_t off) -{ - struct inode *inode = sb_dqopt(sb)->files[type]; - ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - int tocopy; - size_t toread; - struct buffer_head *bh; - loff_t i_size = i_size_read(inode); - - if (off > i_size) - return 0; - if (off+len > i_size) - len = i_size-off; - toread = len; - while (toread > 0) { - tocopy = sb->s_blocksize - offset < toread ? - sb->s_blocksize - offset : toread; - bh = ext4_bread(NULL, inode, blk, 0, &err); - if (err) - return err; - if (!bh) /* A hole? */ - memset(data, 0, tocopy); - else - memcpy(data, bh->b_data+offset, tocopy); - brelse(bh); - offset = 0; - toread -= tocopy; - data += tocopy; - blk++; - } - return len; -} - -/* Write to quotafile (we know the transaction is already started and has - * enough credits) */ -static ssize_t ext4_quota_write(struct super_block *sb, int type, - const char *data, size_t len, loff_t off) -{ - struct inode *inode = sb_dqopt(sb)->files[type]; - ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - struct buffer_head *bh; - handle_t *handle = journal_current_handle(); - - if (EXT4_SB(sb)->s_journal && !handle) { - ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" - " cancelled because transaction is not started", - (unsigned long long)off, (unsigned long long)len); - return -EIO; - } - /* - * Since we account only one data block in transaction credits, - * then it is impossible to cross a block boundary. - */ - if (sb->s_blocksize - offset < len) { - ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" - " cancelled because not block aligned", - (unsigned long long)off, (unsigned long long)len); - return -EIO; - } - - mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); - bh = ext4_bread(handle, inode, blk, 1, &err); - if (!bh) - goto out; - err = ext4_journal_get_write_access(handle, bh); - if (err) { - brelse(bh); - goto out; - } - lock_buffer(bh); - memcpy(bh->b_data+offset, data, len); - flush_dcache_page(bh->b_page); - unlock_buffer(bh); - err = ext4_handle_dirty_metadata(handle, NULL, bh); - brelse(bh); -out: - if (err) { - mutex_unlock(&inode->i_mutex); - return err; - } - if (inode->i_size < off + len) { - i_size_write(inode, off + len); - EXT4_I(inode)->i_disksize = inode->i_size; - ext4_mark_inode_dirty(handle, inode); - } - mutex_unlock(&inode->i_mutex); - return len; -} - -#endif - -static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); -} - -#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) -static inline void register_as_ext2(void) -{ - int err = register_filesystem(&ext2_fs_type); - if (err) - printk(KERN_WARNING - "EXT4-fs: Unable to register as ext2 (%d)\n", err); -} - -static inline void unregister_as_ext2(void) -{ - unregister_filesystem(&ext2_fs_type); -} - -static inline int ext2_feature_set_ok(struct super_block *sb) -{ - if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) - return 0; - if (sb->s_flags & MS_RDONLY) - return 1; - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) - return 0; - return 1; -} -MODULE_ALIAS("ext2"); -#else -static inline void register_as_ext2(void) { } -static inline void unregister_as_ext2(void) { } -static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } -#endif - -#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) -static inline void register_as_ext3(void) -{ - int err = register_filesystem(&ext3_fs_type); - if (err) - printk(KERN_WARNING - "EXT4-fs: Unable to register as ext3 (%d)\n", err); -} - -static inline void unregister_as_ext3(void) -{ - unregister_filesystem(&ext3_fs_type); -} - -static inline int ext3_feature_set_ok(struct super_block *sb) -{ - if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) - return 0; - if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) - return 0; - if (sb->s_flags & MS_RDONLY) - return 1; - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) - return 0; - return 1; -} -MODULE_ALIAS("ext3"); -#else -static inline void register_as_ext3(void) { } -static inline void unregister_as_ext3(void) { } -static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } -#endif - -static struct file_system_type ext4_fs_type = { - .owner = THIS_MODULE, - .name = "ext4", - .mount = ext4_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; - -static int __init ext4_init_feat_adverts(void) -{ - struct ext4_features *ef; - int ret = -ENOMEM; - - ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); - if (!ef) - goto out; - - ef->f_kobj.kset = ext4_kset; - init_completion(&ef->f_kobj_unregister); - ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, - "features"); - if (ret) { - kfree(ef); - goto out; - } - - ext4_feat = ef; - ret = 0; -out: - return ret; -} - -static void ext4_exit_feat_adverts(void) -{ - kobject_put(&ext4_feat->f_kobj); - wait_for_completion(&ext4_feat->f_kobj_unregister); - kfree(ext4_feat); -} - -/* Shared across all ext4 file systems */ -wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; -struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; - -static int __init ext4_init_fs(void) -{ - int i, err; - - ext4_li_info = NULL; - mutex_init(&ext4_li_mtx); - - ext4_check_flag_values(); - - for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { - mutex_init(&ext4__aio_mutex[i]); - init_waitqueue_head(&ext4__ioend_wq[i]); - } - - err = ext4_init_pageio(); - if (err) - return err; - err = ext4_init_system_zone(); - if (err) - goto out6; - ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); - if (!ext4_kset) - goto out5; - ext4_proc_root = proc_mkdir("fs/ext4", NULL); - - err = ext4_init_feat_adverts(); - if (err) - goto out4; - - err = ext4_init_mballoc(); - if (err) - goto out3; - - err = ext4_init_xattr(); - if (err) - goto out2; - err = init_inodecache(); - if (err) - goto out1; - register_as_ext3(); - register_as_ext2(); - err = register_filesystem(&ext4_fs_type); - if (err) - goto out; - - return 0; -out: - unregister_as_ext2(); - unregister_as_ext3(); - destroy_inodecache(); -out1: - ext4_exit_xattr(); -out2: - ext4_exit_mballoc(); -out3: - ext4_exit_feat_adverts(); -out4: - if (ext4_proc_root) - remove_proc_entry("fs/ext4", NULL); - kset_unregister(ext4_kset); -out5: - ext4_exit_system_zone(); -out6: - ext4_exit_pageio(); - return err; -} - -static void __exit ext4_exit_fs(void) -{ - ext4_destroy_lazyinit_thread(); - unregister_as_ext2(); - unregister_as_ext3(); - unregister_filesystem(&ext4_fs_type); - destroy_inodecache(); - ext4_exit_xattr(); - ext4_exit_mballoc(); - ext4_exit_feat_adverts(); - remove_proc_entry("fs/ext4", NULL); - kset_unregister(ext4_kset); - ext4_exit_system_zone(); - ext4_exit_pageio(); -} - -MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); -MODULE_DESCRIPTION("Fourth Extended Filesystem"); -MODULE_LICENSE("GPL"); -module_init(ext4_init_fs) -module_exit(ext4_exit_fs) |