diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ext2/super.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ext2/super.c | 1527 |
1 files changed, 0 insertions, 1527 deletions
diff --git a/ANDROID_3.4.5/fs/ext2/super.c b/ANDROID_3.4.5/fs/ext2/super.c deleted file mode 100644 index e1025c7a..00000000 --- a/ANDROID_3.4.5/fs/ext2/super.c +++ /dev/null @@ -1,1527 +0,0 @@ -/* - * linux/fs/ext2/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/slab.h> -#include <linux/init.h> -#include <linux/blkdev.h> -#include <linux/parser.h> -#include <linux/random.h> -#include <linux/buffer_head.h> -#include <linux/exportfs.h> -#include <linux/vfs.h> -#include <linux/seq_file.h> -#include <linux/mount.h> -#include <linux/log2.h> -#include <linux/quotaops.h> -#include <asm/uaccess.h> -#include "ext2.h" -#include "xattr.h" -#include "acl.h" -#include "xip.h" - -static void ext2_sync_super(struct super_block *sb, - struct ext2_super_block *es, int wait); -static int ext2_remount (struct super_block * sb, int * flags, char * data); -static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); -static int ext2_sync_fs(struct super_block *sb, int wait); - -void ext2_error(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - struct ext2_sb_info *sbi = EXT2_SB(sb); - struct ext2_super_block *es = sbi->s_es; - - if (!(sb->s_flags & MS_RDONLY)) { - spin_lock(&sbi->s_lock); - sbi->s_mount_state |= EXT2_ERROR_FS; - es->s_state |= cpu_to_le16(EXT2_ERROR_FS); - spin_unlock(&sbi->s_lock); - ext2_sync_super(sb, es, 1); - } - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); - - if (test_opt(sb, ERRORS_PANIC)) - panic("EXT2-fs: panic from previous error\n"); - if (test_opt(sb, ERRORS_RO)) { - ext2_msg(sb, KERN_CRIT, - "error: remounting filesystem read-only"); - sb->s_flags |= MS_RDONLY; - } -} - -void ext2_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("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); - - va_end(args); -} - -/* - * This must be called with sbi->s_lock held. - */ -void ext2_update_dynamic_rev(struct super_block *sb) -{ - struct ext2_super_block *es = EXT2_SB(sb)->s_es; - - if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) - return; - - ext2_msg(sb, KERN_WARNING, - "warning: updating to rev %d because of " - "new feature flag, running e2fsck is recommended", - EXT2_DYNAMIC_REV); - - es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); - es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); - es->s_rev_level = cpu_to_le32(EXT2_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. - */ -} - -static void ext2_put_super (struct super_block * sb) -{ - int db_count; - int i; - struct ext2_sb_info *sbi = EXT2_SB(sb); - - dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); - - if (sb->s_dirt) - ext2_write_super(sb); - - ext2_xattr_put_super(sb); - if (!(sb->s_flags & MS_RDONLY)) { - struct ext2_super_block *es = sbi->s_es; - - spin_lock(&sbi->s_lock); - es->s_state = cpu_to_le16(sbi->s_mount_state); - spin_unlock(&sbi->s_lock); - ext2_sync_super(sb, es, 1); - } - db_count = sbi->s_gdb_count; - for (i = 0; i < db_count; i++) - if (sbi->s_group_desc[i]) - brelse (sbi->s_group_desc[i]); - kfree(sbi->s_group_desc); - kfree(sbi->s_debts); - percpu_counter_destroy(&sbi->s_freeblocks_counter); - percpu_counter_destroy(&sbi->s_freeinodes_counter); - percpu_counter_destroy(&sbi->s_dirs_counter); - brelse (sbi->s_sbh); - sb->s_fs_info = NULL; - kfree(sbi->s_blockgroup_lock); - kfree(sbi); -} - -static struct kmem_cache * ext2_inode_cachep; - -static struct inode *ext2_alloc_inode(struct super_block *sb) -{ - struct ext2_inode_info *ei; - ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); - if (!ei) - return NULL; - ei->i_block_alloc_info = NULL; - ei->vfs_inode.i_version = 1; - return &ei->vfs_inode; -} - -static void ext2_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); -} - -static void ext2_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, ext2_i_callback); -} - -static void init_once(void *foo) -{ - struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; - - rwlock_init(&ei->i_meta_lock); -#ifdef CONFIG_EXT2_FS_XATTR - init_rwsem(&ei->xattr_sem); -#endif - mutex_init(&ei->truncate_mutex); - inode_init_once(&ei->vfs_inode); -} - -static int init_inodecache(void) -{ - ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", - sizeof(struct ext2_inode_info), - 0, (SLAB_RECLAIM_ACCOUNT| - SLAB_MEM_SPREAD), - init_once); - if (ext2_inode_cachep == NULL) - return -ENOMEM; - return 0; -} - -static void destroy_inodecache(void) -{ - kmem_cache_destroy(ext2_inode_cachep); -} - -static int ext2_show_options(struct seq_file *seq, struct dentry *root) -{ - struct super_block *sb = root->d_sb; - struct ext2_sb_info *sbi = EXT2_SB(sb); - struct ext2_super_block *es = sbi->s_es; - unsigned long def_mount_opts; - - spin_lock(&sbi->s_lock); - def_mount_opts = le32_to_cpu(es->s_default_mount_opts); - - if (sbi->s_sb_block != 1) - seq_printf(seq, ",sb=%lu", sbi->s_sb_block); - if (test_opt(sb, MINIX_DF)) - seq_puts(seq, ",minixdf"); - if (test_opt(sb, GRPID)) - seq_puts(seq, ",grpid"); - if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) - seq_puts(seq, ",nogrpid"); - if (sbi->s_resuid != EXT2_DEF_RESUID || - le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { - seq_printf(seq, ",resuid=%u", sbi->s_resuid); - } - if (sbi->s_resgid != EXT2_DEF_RESGID || - le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { - seq_printf(seq, ",resgid=%u", sbi->s_resgid); - } - if (test_opt(sb, ERRORS_RO)) { - int def_errors = le16_to_cpu(es->s_errors); - - if (def_errors == EXT2_ERRORS_PANIC || - def_errors == EXT2_ERRORS_CONTINUE) { - seq_puts(seq, ",errors=remount-ro"); - } - } - if (test_opt(sb, ERRORS_CONT)) - seq_puts(seq, ",errors=continue"); - if (test_opt(sb, ERRORS_PANIC)) - seq_puts(seq, ",errors=panic"); - if (test_opt(sb, NO_UID32)) - seq_puts(seq, ",nouid32"); - if (test_opt(sb, DEBUG)) - seq_puts(seq, ",debug"); - if (test_opt(sb, OLDALLOC)) - seq_puts(seq, ",oldalloc"); - -#ifdef CONFIG_EXT2_FS_XATTR - if (test_opt(sb, XATTR_USER)) - seq_puts(seq, ",user_xattr"); - if (!test_opt(sb, XATTR_USER) && - (def_mount_opts & EXT2_DEFM_XATTR_USER)) { - seq_puts(seq, ",nouser_xattr"); - } -#endif - -#ifdef CONFIG_EXT2_FS_POSIX_ACL - if (test_opt(sb, POSIX_ACL)) - seq_puts(seq, ",acl"); - if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) - seq_puts(seq, ",noacl"); -#endif - - if (test_opt(sb, NOBH)) - seq_puts(seq, ",nobh"); - -#if defined(CONFIG_QUOTA) - if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) - seq_puts(seq, ",usrquota"); - - if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) - seq_puts(seq, ",grpquota"); -#endif - -#if defined(CONFIG_EXT2_FS_XIP) - if (sbi->s_mount_opt & EXT2_MOUNT_XIP) - seq_puts(seq, ",xip"); -#endif - - if (!test_opt(sb, RESERVATION)) - seq_puts(seq, ",noreservation"); - - spin_unlock(&sbi->s_lock); - return 0; -} - -#ifdef CONFIG_QUOTA -static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); -static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); -#endif - -static const struct super_operations ext2_sops = { - .alloc_inode = ext2_alloc_inode, - .destroy_inode = ext2_destroy_inode, - .write_inode = ext2_write_inode, - .evict_inode = ext2_evict_inode, - .put_super = ext2_put_super, - .write_super = ext2_write_super, - .sync_fs = ext2_sync_fs, - .statfs = ext2_statfs, - .remount_fs = ext2_remount, - .show_options = ext2_show_options, -#ifdef CONFIG_QUOTA - .quota_read = ext2_quota_read, - .quota_write = ext2_quota_write, -#endif -}; - -static struct inode *ext2_nfs_get_inode(struct super_block *sb, - u64 ino, u32 generation) -{ - struct inode *inode; - - if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) - return ERR_PTR(-ESTALE); - if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) - return ERR_PTR(-ESTALE); - - /* - * ext2_iget isn't quite right if the inode is currently unallocated! - * However ext2_iget currently does appropriate checks to handle stale - * inodes so everything is OK. - */ - inode = ext2_iget(sb, ino); - if (IS_ERR(inode)) - return ERR_CAST(inode); - if (generation && inode->i_generation != generation) { - /* we didn't find the right inode.. */ - iput(inode); - return ERR_PTR(-ESTALE); - } - return inode; -} - -static struct dentry *ext2_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, - ext2_nfs_get_inode); -} - -static struct dentry *ext2_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, - ext2_nfs_get_inode); -} - -/* Yes, most of these are left as NULL!! - * A NULL value implies the default, which works with ext2-like file - * systems, but can be improved upon. - * Currently only get_parent is required. - */ -static const struct export_operations ext2_export_ops = { - .fh_to_dentry = ext2_fh_to_dentry, - .fh_to_parent = ext2_fh_to_parent, - .get_parent = ext2_get_parent, -}; - -static unsigned long get_sb_block(void **data) -{ - unsigned long sb_block; - char *options = (char *) *data; - - if (!options || strncmp(options, "sb=", 3) != 0) - return 1; /* Default location */ - options += 3; - sb_block = simple_strtoul(options, &options, 0); - if (*options && *options != ',') { - printk("EXT2-fs: Invalid sb specification: %s\n", - (char *) *data); - return 1; - } - if (*options == ',') - options++; - *data = (void *) options; - return sb_block; -} - -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_nocheck, Opt_debug, - Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, - Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, - Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation -}; - -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_nocheck, "check=none"}, - {Opt_nocheck, "nocheck"}, - {Opt_debug, "debug"}, - {Opt_oldalloc, "oldalloc"}, - {Opt_orlov, "orlov"}, - {Opt_nobh, "nobh"}, - {Opt_user_xattr, "user_xattr"}, - {Opt_nouser_xattr, "nouser_xattr"}, - {Opt_acl, "acl"}, - {Opt_noacl, "noacl"}, - {Opt_xip, "xip"}, - {Opt_grpquota, "grpquota"}, - {Opt_ignore, "noquota"}, - {Opt_quota, "quota"}, - {Opt_usrquota, "usrquota"}, - {Opt_reservation, "reservation"}, - {Opt_noreservation, "noreservation"}, - {Opt_err, NULL} -}; - -static int parse_options(char *options, struct super_block *sb) -{ - char *p; - struct ext2_sb_info *sbi = EXT2_SB(sb); - substring_t args[MAX_OPT_ARGS]; - int option; - - if (!options) - return 1; - - while ((p = strsep (&options, ",")) != NULL) { - int token; - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - case Opt_bsd_df: - clear_opt (sbi->s_mount_opt, MINIX_DF); - break; - case Opt_minix_df: - set_opt (sbi->s_mount_opt, MINIX_DF); - break; - case Opt_grpid: - set_opt (sbi->s_mount_opt, GRPID); - break; - case Opt_nogrpid: - clear_opt (sbi->s_mount_opt, GRPID); - break; - case Opt_resuid: - if (match_int(&args[0], &option)) - return 0; - sbi->s_resuid = option; - break; - case Opt_resgid: - if (match_int(&args[0], &option)) - return 0; - sbi->s_resgid = option; - break; - case Opt_sb: - /* handled by get_sb_block() instead of here */ - /* *sb_block = match_int(&args[0]); */ - break; - case Opt_err_panic: - clear_opt (sbi->s_mount_opt, ERRORS_CONT); - clear_opt (sbi->s_mount_opt, ERRORS_RO); - set_opt (sbi->s_mount_opt, ERRORS_PANIC); - break; - case Opt_err_ro: - clear_opt (sbi->s_mount_opt, ERRORS_CONT); - clear_opt (sbi->s_mount_opt, ERRORS_PANIC); - set_opt (sbi->s_mount_opt, ERRORS_RO); - break; - case Opt_err_cont: - clear_opt (sbi->s_mount_opt, ERRORS_RO); - clear_opt (sbi->s_mount_opt, ERRORS_PANIC); - set_opt (sbi->s_mount_opt, ERRORS_CONT); - break; - case Opt_nouid32: - set_opt (sbi->s_mount_opt, NO_UID32); - break; - case Opt_nocheck: - clear_opt (sbi->s_mount_opt, CHECK); - break; - case Opt_debug: - set_opt (sbi->s_mount_opt, DEBUG); - break; - case Opt_oldalloc: - set_opt (sbi->s_mount_opt, OLDALLOC); - break; - case Opt_orlov: - clear_opt (sbi->s_mount_opt, OLDALLOC); - break; - case Opt_nobh: - set_opt (sbi->s_mount_opt, NOBH); - break; -#ifdef CONFIG_EXT2_FS_XATTR - case Opt_user_xattr: - set_opt (sbi->s_mount_opt, XATTR_USER); - break; - case Opt_nouser_xattr: - clear_opt (sbi->s_mount_opt, XATTR_USER); - break; -#else - case Opt_user_xattr: - case Opt_nouser_xattr: - ext2_msg(sb, KERN_INFO, "(no)user_xattr options" - "not supported"); - break; -#endif -#ifdef CONFIG_EXT2_FS_POSIX_ACL - case Opt_acl: - set_opt(sbi->s_mount_opt, POSIX_ACL); - break; - case Opt_noacl: - clear_opt(sbi->s_mount_opt, POSIX_ACL); - break; -#else - case Opt_acl: - case Opt_noacl: - ext2_msg(sb, KERN_INFO, - "(no)acl options not supported"); - break; -#endif - case Opt_xip: -#ifdef CONFIG_EXT2_FS_XIP - set_opt (sbi->s_mount_opt, XIP); -#else - ext2_msg(sb, KERN_INFO, "xip option not supported"); -#endif - break; - -#if defined(CONFIG_QUOTA) - case Opt_quota: - case Opt_usrquota: - set_opt(sbi->s_mount_opt, USRQUOTA); - break; - - case Opt_grpquota: - set_opt(sbi->s_mount_opt, GRPQUOTA); - break; -#else - case Opt_quota: - case Opt_usrquota: - case Opt_grpquota: - ext2_msg(sb, KERN_INFO, - "quota operations not supported"); - break; -#endif - - case Opt_reservation: - set_opt(sbi->s_mount_opt, RESERVATION); - ext2_msg(sb, KERN_INFO, "reservations ON"); - break; - case Opt_noreservation: - clear_opt(sbi->s_mount_opt, RESERVATION); - ext2_msg(sb, KERN_INFO, "reservations OFF"); - break; - case Opt_ignore: - break; - default: - return 0; - } - } - return 1; -} - -static int ext2_setup_super (struct super_block * sb, - struct ext2_super_block * es, - int read_only) -{ - int res = 0; - struct ext2_sb_info *sbi = EXT2_SB(sb); - - if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { - ext2_msg(sb, KERN_ERR, - "error: revision level too high, " - "forcing read-only mode"); - res = MS_RDONLY; - } - if (read_only) - return res; - if (!(sbi->s_mount_state & EXT2_VALID_FS)) - ext2_msg(sb, KERN_WARNING, - "warning: mounting unchecked fs, " - "running e2fsck is recommended"); - else if ((sbi->s_mount_state & EXT2_ERROR_FS)) - ext2_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)) - ext2_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())) - ext2_msg(sb, KERN_WARNING, - "warning: checktime reached, " - "running e2fsck is recommended"); - if (!le16_to_cpu(es->s_max_mnt_count)) - es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); - le16_add_cpu(&es->s_mnt_count, 1); - if (test_opt (sb, DEBUG)) - ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " - "bpg=%lu, ipg=%lu, mo=%04lx]", - EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, - sbi->s_frag_size, - sbi->s_groups_count, - EXT2_BLOCKS_PER_GROUP(sb), - EXT2_INODES_PER_GROUP(sb), - sbi->s_mount_opt); - return res; -} - -static int ext2_check_descriptors(struct super_block *sb) -{ - int i; - struct ext2_sb_info *sbi = EXT2_SB(sb); - - ext2_debug ("Checking group descriptors"); - - for (i = 0; i < sbi->s_groups_count; i++) { - struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); - ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); - ext2_fsblk_t last_block; - - if (i == sbi->s_groups_count - 1) - last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; - else - last_block = first_block + - (EXT2_BLOCKS_PER_GROUP(sb) - 1); - - if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || - le32_to_cpu(gdp->bg_block_bitmap) > last_block) - { - ext2_error (sb, "ext2_check_descriptors", - "Block bitmap for group %d" - " not in group (block %lu)!", - i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); - return 0; - } - if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || - le32_to_cpu(gdp->bg_inode_bitmap) > last_block) - { - ext2_error (sb, "ext2_check_descriptors", - "Inode bitmap for group %d" - " not in group (block %lu)!", - i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); - return 0; - } - if (le32_to_cpu(gdp->bg_inode_table) < first_block || - le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > - last_block) - { - ext2_error (sb, "ext2_check_descriptors", - "Inode table for group %d" - " not in group (block %lu)!", - i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); - return 0; - } - } - return 1; -} - -/* - * Maximal file size. There is a direct, and {,double-,triple-}indirect - * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. - * We need to be 1 filesystem block less than the 2^32 sector limit. - */ -static loff_t ext2_max_size(int bits) -{ - loff_t res = EXT2_NDIR_BLOCKS; - int meta_blocks; - loff_t upper_limit; - - /* This is calculated to be the largest file size for a - * dense, file such that the total number of - * sectors in the file, including data and all indirect blocks, - * does not exceed 2^32 -1 - * __u32 i_blocks representing the total number of - * 512 bytes blocks of the file - */ - upper_limit = (1LL << 32) - 1; - - /* total blocks in file system block size */ - upper_limit >>= (bits - 9); - - - /* 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 unsigned long descriptor_loc(struct super_block *sb, - unsigned long logic_sb_block, - int nr) -{ - struct ext2_sb_info *sbi = EXT2_SB(sb); - unsigned long bg, first_meta_bg; - int has_super = 0; - - first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); - - if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || - nr < first_meta_bg) - return (logic_sb_block + nr + 1); - bg = sbi->s_desc_per_block * nr; - if (ext2_bg_has_super(sb, bg)) - has_super = 1; - - return ext2_group_first_block_no(sb, bg) + has_super; -} - -static int ext2_fill_super(struct super_block *sb, void *data, int silent) -{ - struct buffer_head * bh; - struct ext2_sb_info * sbi; - struct ext2_super_block * es; - struct inode *root; - unsigned long block; - unsigned long sb_block = get_sb_block(&data); - unsigned long logic_sb_block; - unsigned long offset = 0; - unsigned long def_mount_opts; - long ret = -EINVAL; - int blocksize = BLOCK_SIZE; - int db_count; - int i, j; - __le32 features; - int err; - - err = -ENOMEM; - sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); - if (!sbi) - goto failed_unlock; - - sbi->s_blockgroup_lock = - kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); - if (!sbi->s_blockgroup_lock) { - kfree(sbi); - goto failed_unlock; - } - sb->s_fs_info = sbi; - sbi->s_sb_block = sb_block; - - spin_lock_init(&sbi->s_lock); - - /* - * See what the current blocksize for the device is, and - * use that as the blocksize. Otherwise (or if the blocksize - * is smaller than the default) use the default. - * This is important for devices that have a hardware - * sectorsize that is larger than the default. - */ - blocksize = sb_min_blocksize(sb, BLOCK_SIZE); - if (!blocksize) { - ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); - goto failed_sbi; - } - - /* - * If the superblock doesn't start on a hardware sector boundary, - * calculate the offset. - */ - if (blocksize != BLOCK_SIZE) { - logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; - offset = (sb_block*BLOCK_SIZE) % blocksize; - } else { - logic_sb_block = sb_block; - } - - if (!(bh = sb_bread(sb, logic_sb_block))) { - ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); - goto failed_sbi; - } - /* - * Note: s_es must be initialized as soon as possible because - * some ext2 macro-instructions depend on its value - */ - es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); - sbi->s_es = es; - sb->s_magic = le16_to_cpu(es->s_magic); - - if (sb->s_magic != EXT2_SUPER_MAGIC) - goto cantfind_ext2; - - /* Set defaults before we parse the mount options */ - def_mount_opts = le32_to_cpu(es->s_default_mount_opts); - if (def_mount_opts & EXT2_DEFM_DEBUG) - set_opt(sbi->s_mount_opt, DEBUG); - if (def_mount_opts & EXT2_DEFM_BSDGROUPS) - set_opt(sbi->s_mount_opt, GRPID); - if (def_mount_opts & EXT2_DEFM_UID16) - set_opt(sbi->s_mount_opt, NO_UID32); -#ifdef CONFIG_EXT2_FS_XATTR - if (def_mount_opts & EXT2_DEFM_XATTR_USER) - set_opt(sbi->s_mount_opt, XATTR_USER); -#endif -#ifdef CONFIG_EXT2_FS_POSIX_ACL - if (def_mount_opts & EXT2_DEFM_ACL) - set_opt(sbi->s_mount_opt, POSIX_ACL); -#endif - - if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) - set_opt(sbi->s_mount_opt, ERRORS_PANIC); - else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) - set_opt(sbi->s_mount_opt, ERRORS_CONT); - else - set_opt(sbi->s_mount_opt, ERRORS_RO); - - sbi->s_resuid = le16_to_cpu(es->s_def_resuid); - sbi->s_resgid = le16_to_cpu(es->s_def_resgid); - - set_opt(sbi->s_mount_opt, RESERVATION); - - if (!parse_options((char *) data, sb)) - goto failed_mount; - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? - MS_POSIXACL : 0); - - ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset - EXT2_MOUNT_XIP if not */ - - if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && - (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || - EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || - EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) - ext2_msg(sb, KERN_WARNING, - "warning: feature flags set on rev 0 fs, " - "running e2fsck is recommended"); - /* - * 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. - */ - features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); - if (features) { - ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " - "unsupported optional features (%x)", - le32_to_cpu(features)); - goto failed_mount; - } - if (!(sb->s_flags & MS_RDONLY) && - (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ - ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " - "unsupported optional features (%x)", - le32_to_cpu(features)); - goto failed_mount; - } - - blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); - - if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { - if (!silent) - ext2_msg(sb, KERN_ERR, - "error: unsupported blocksize for xip"); - goto failed_mount; - } - - /* If the blocksize doesn't match, re-read the thing.. */ - if (sb->s_blocksize != blocksize) { - brelse(bh); - - if (!sb_set_blocksize(sb, blocksize)) { - ext2_msg(sb, KERN_ERR, - "error: bad blocksize %d", blocksize); - goto failed_sbi; - } - - logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; - offset = (sb_block*BLOCK_SIZE) % blocksize; - bh = sb_bread(sb, logic_sb_block); - if(!bh) { - ext2_msg(sb, KERN_ERR, "error: couldn't read" - "superblock on 2nd try"); - goto failed_sbi; - } - es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); - sbi->s_es = es; - if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { - ext2_msg(sb, KERN_ERR, "error: magic mismatch"); - goto failed_mount; - } - } - - sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); - sb->s_max_links = EXT2_LINK_MAX; - - if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { - sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; - sbi->s_first_ino = EXT2_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 < EXT2_GOOD_OLD_INODE_SIZE) || - !is_power_of_2(sbi->s_inode_size) || - (sbi->s_inode_size > blocksize)) { - ext2_msg(sb, KERN_ERR, - "error: unsupported inode size: %d", - sbi->s_inode_size); - goto failed_mount; - } - } - - sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << - le32_to_cpu(es->s_log_frag_size); - if (sbi->s_frag_size == 0) - goto cantfind_ext2; - sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; - - sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); - sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); - sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); - - if (EXT2_INODE_SIZE(sb) == 0) - goto cantfind_ext2; - sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); - if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) - goto cantfind_ext2; - sbi->s_itb_per_group = sbi->s_inodes_per_group / - sbi->s_inodes_per_block; - sbi->s_desc_per_block = sb->s_blocksize / - sizeof (struct ext2_group_desc); - sbi->s_sbh = bh; - sbi->s_mount_state = le16_to_cpu(es->s_state); - sbi->s_addr_per_block_bits = - ilog2 (EXT2_ADDR_PER_BLOCK(sb)); - sbi->s_desc_per_block_bits = - ilog2 (EXT2_DESC_PER_BLOCK(sb)); - - if (sb->s_magic != EXT2_SUPER_MAGIC) - goto cantfind_ext2; - - if (sb->s_blocksize != bh->b_size) { - if (!silent) - ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); - goto failed_mount; - } - - if (sb->s_blocksize != sbi->s_frag_size) { - ext2_msg(sb, KERN_ERR, - "error: fragsize %lu != blocksize %lu" - "(not supported yet)", - sbi->s_frag_size, sb->s_blocksize); - goto failed_mount; - } - - if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { - ext2_msg(sb, KERN_ERR, - "error: #blocks per group too big: %lu", - sbi->s_blocks_per_group); - goto failed_mount; - } - if (sbi->s_frags_per_group > sb->s_blocksize * 8) { - ext2_msg(sb, KERN_ERR, - "error: #fragments per group too big: %lu", - sbi->s_frags_per_group); - goto failed_mount; - } - if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { - ext2_msg(sb, KERN_ERR, - "error: #inodes per group too big: %lu", - sbi->s_inodes_per_group); - goto failed_mount; - } - - if (EXT2_BLOCKS_PER_GROUP(sb) == 0) - goto cantfind_ext2; - sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - - le32_to_cpu(es->s_first_data_block) - 1) - / EXT2_BLOCKS_PER_GROUP(sb)) + 1; - db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / - EXT2_DESC_PER_BLOCK(sb); - sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); - if (sbi->s_group_desc == NULL) { - ext2_msg(sb, KERN_ERR, "error: not enough memory"); - goto failed_mount; - } - bgl_lock_init(sbi->s_blockgroup_lock); - sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); - if (!sbi->s_debts) { - ext2_msg(sb, KERN_ERR, "error: not enough memory"); - goto failed_mount_group_desc; - } - for (i = 0; i < db_count; i++) { - block = descriptor_loc(sb, logic_sb_block, i); - sbi->s_group_desc[i] = sb_bread(sb, block); - if (!sbi->s_group_desc[i]) { - for (j = 0; j < i; j++) - brelse (sbi->s_group_desc[j]); - ext2_msg(sb, KERN_ERR, - "error: unable to read group descriptors"); - goto failed_mount_group_desc; - } - } - if (!ext2_check_descriptors (sb)) { - ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); - 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); - - /* per fileystem reservation list head & lock */ - spin_lock_init(&sbi->s_rsv_window_lock); - sbi->s_rsv_window_root = RB_ROOT; - /* - * Add a single, static dummy reservation to the start of the - * reservation window list --- it gives us a placeholder for - * append-at-start-of-list which makes the allocation logic - * _much_ simpler. - */ - sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; - sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; - sbi->s_rsv_window_head.rsv_alloc_hit = 0; - sbi->s_rsv_window_head.rsv_goal_size = 0; - ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); - - err = percpu_counter_init(&sbi->s_freeblocks_counter, - ext2_count_free_blocks(sb)); - if (!err) { - err = percpu_counter_init(&sbi->s_freeinodes_counter, - ext2_count_free_inodes(sb)); - } - if (!err) { - err = percpu_counter_init(&sbi->s_dirs_counter, - ext2_count_dirs(sb)); - } - if (err) { - ext2_msg(sb, KERN_ERR, "error: insufficient memory"); - goto failed_mount3; - } - /* - * set up enough so that it can read an inode - */ - sb->s_op = &ext2_sops; - sb->s_export_op = &ext2_export_ops; - sb->s_xattr = ext2_xattr_handlers; - -#ifdef CONFIG_QUOTA - sb->dq_op = &dquot_operations; - sb->s_qcop = &dquot_quotactl_ops; -#endif - - root = ext2_iget(sb, EXT2_ROOT_INO); - if (IS_ERR(root)) { - ret = PTR_ERR(root); - goto failed_mount3; - } - if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { - iput(root); - ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); - goto failed_mount3; - } - - sb->s_root = d_make_root(root); - if (!sb->s_root) { - ext2_msg(sb, KERN_ERR, "error: get root inode failed"); - ret = -ENOMEM; - goto failed_mount3; - } - if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) - ext2_msg(sb, KERN_WARNING, - "warning: mounting ext3 filesystem as ext2"); - if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) - sb->s_flags |= MS_RDONLY; - ext2_write_super(sb); - return 0; - -cantfind_ext2: - if (!silent) - ext2_msg(sb, KERN_ERR, - "error: can't find an ext2 filesystem on dev %s.", - sb->s_id); - goto failed_mount; -failed_mount3: - percpu_counter_destroy(&sbi->s_freeblocks_counter); - percpu_counter_destroy(&sbi->s_freeinodes_counter); - percpu_counter_destroy(&sbi->s_dirs_counter); -failed_mount2: - for (i = 0; i < db_count; i++) - brelse(sbi->s_group_desc[i]); -failed_mount_group_desc: - kfree(sbi->s_group_desc); - kfree(sbi->s_debts); -failed_mount: - brelse(bh); -failed_sbi: - sb->s_fs_info = NULL; - kfree(sbi->s_blockgroup_lock); - kfree(sbi); -failed_unlock: - return ret; -} - -static void ext2_clear_super_error(struct super_block *sb) -{ - struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; - - 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. - */ - ext2_msg(sb, KERN_ERR, - "previous I/O error to superblock detected\n"); - clear_buffer_write_io_error(sbh); - set_buffer_uptodate(sbh); - } -} - -static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, - int wait) -{ - ext2_clear_super_error(sb); - spin_lock(&EXT2_SB(sb)->s_lock); - es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); - es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); - es->s_wtime = cpu_to_le32(get_seconds()); - /* unlock before we do IO */ - spin_unlock(&EXT2_SB(sb)->s_lock); - mark_buffer_dirty(EXT2_SB(sb)->s_sbh); - if (wait) - sync_dirty_buffer(EXT2_SB(sb)->s_sbh); - sb->s_dirt = 0; -} - -/* - * In the second extended file system, it is not necessary to - * write the super block since we use a mapping of the - * disk super block in a buffer. - * - * However, this function is still used to set the fs valid - * flags to 0. We need to set this flag to 0 since the fs - * may have been checked while mounted and e2fsck may have - * set s_state to EXT2_VALID_FS after some corrections. - */ -static int ext2_sync_fs(struct super_block *sb, int wait) -{ - struct ext2_sb_info *sbi = EXT2_SB(sb); - struct ext2_super_block *es = EXT2_SB(sb)->s_es; - - spin_lock(&sbi->s_lock); - if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { - ext2_debug("setting valid to 0\n"); - es->s_state &= cpu_to_le16(~EXT2_VALID_FS); - } - spin_unlock(&sbi->s_lock); - ext2_sync_super(sb, es, wait); - return 0; -} - - -void ext2_write_super(struct super_block *sb) -{ - if (!(sb->s_flags & MS_RDONLY)) - ext2_sync_fs(sb, 1); - else - sb->s_dirt = 0; -} - -static int ext2_remount (struct super_block * sb, int * flags, char * data) -{ - struct ext2_sb_info * sbi = EXT2_SB(sb); - struct ext2_super_block * es; - unsigned long old_mount_opt = sbi->s_mount_opt; - struct ext2_mount_options old_opts; - unsigned long old_sb_flags; - int err; - - spin_lock(&sbi->s_lock); - - /* Store the old options */ - old_sb_flags = sb->s_flags; - old_opts.s_mount_opt = sbi->s_mount_opt; - old_opts.s_resuid = sbi->s_resuid; - old_opts.s_resgid = sbi->s_resgid; - - /* - * Allow the "check" option to be passed as a remount option. - */ - if (!parse_options(data, sb)) { - err = -EINVAL; - goto restore_opts; - } - - sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | - ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); - - ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset - EXT2_MOUNT_XIP if not */ - - if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { - ext2_msg(sb, KERN_WARNING, - "warning: unsupported blocksize for xip"); - err = -EINVAL; - goto restore_opts; - } - - es = sbi->s_es; - if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) { - ext2_msg(sb, KERN_WARNING, "warning: refusing change of " - "xip flag with busy inodes while remounting"); - sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; - sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; - } - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { - spin_unlock(&sbi->s_lock); - return 0; - } - if (*flags & MS_RDONLY) { - if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || - !(sbi->s_mount_state & EXT2_VALID_FS)) { - spin_unlock(&sbi->s_lock); - return 0; - } - - /* - * OK, we are remounting a valid rw partition rdonly, so set - * the rdonly flag and then mark the partition as valid again. - */ - es->s_state = cpu_to_le16(sbi->s_mount_state); - es->s_mtime = cpu_to_le32(get_seconds()); - spin_unlock(&sbi->s_lock); - - err = dquot_suspend(sb, -1); - if (err < 0) { - spin_lock(&sbi->s_lock); - goto restore_opts; - } - - ext2_sync_super(sb, es, 1); - } else { - __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, - ~EXT2_FEATURE_RO_COMPAT_SUPP); - if (ret) { - ext2_msg(sb, KERN_WARNING, - "warning: couldn't remount RDWR because of " - "unsupported optional features (%x).", - le32_to_cpu(ret)); - err = -EROFS; - 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.) - */ - sbi->s_mount_state = le16_to_cpu(es->s_state); - if (!ext2_setup_super (sb, es, 0)) - sb->s_flags &= ~MS_RDONLY; - spin_unlock(&sbi->s_lock); - - ext2_write_super(sb); - - dquot_resume(sb, -1); - } - - return 0; -restore_opts: - sbi->s_mount_opt = old_opts.s_mount_opt; - sbi->s_resuid = old_opts.s_resuid; - sbi->s_resgid = old_opts.s_resgid; - sb->s_flags = old_sb_flags; - spin_unlock(&sbi->s_lock); - return err; -} - -static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) -{ - struct super_block *sb = dentry->d_sb; - struct ext2_sb_info *sbi = EXT2_SB(sb); - struct ext2_super_block *es = sbi->s_es; - u64 fsid; - - spin_lock(&sbi->s_lock); - - if (test_opt (sb, MINIX_DF)) - sbi->s_overhead_last = 0; - else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { - unsigned long i, overhead = 0; - smp_rmb(); - - /* - * 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 = le32_to_cpu(es->s_first_data_block); - - /* - * Add the overhead attributed to the superblock and - * block group descriptors. If the sparse superblocks - * feature is turned on, then not all groups have this. - */ - for (i = 0; i < sbi->s_groups_count; i++) - overhead += ext2_bg_has_super(sb, i) + - ext2_bg_num_gdb(sb, i); - - /* - * Every block group has an inode bitmap, a block - * bitmap, and an inode table. - */ - overhead += (sbi->s_groups_count * - (2 + sbi->s_itb_per_group)); - sbi->s_overhead_last = overhead; - smp_wmb(); - sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); - } - - buf->f_type = EXT2_SUPER_MAGIC; - buf->f_bsize = sb->s_blocksize; - buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; - buf->f_bfree = ext2_count_free_blocks(sb); - es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); - buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); - if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) - buf->f_bavail = 0; - buf->f_files = le32_to_cpu(es->s_inodes_count); - buf->f_ffree = ext2_count_free_inodes(sb); - es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); - buf->f_namelen = EXT2_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; - spin_unlock(&sbi->s_lock); - return 0; -} - -static struct dentry *ext2_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); -} - -#ifdef CONFIG_QUOTA - -/* 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 ext2_quota_read(struct super_block *sb, int type, char *data, - size_t len, loff_t off) -{ - struct inode *inode = sb_dqopt(sb)->files[type]; - sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - int tocopy; - size_t toread; - struct buffer_head tmp_bh; - 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; - - tmp_bh.b_state = 0; - tmp_bh.b_size = sb->s_blocksize; - err = ext2_get_block(inode, blk, &tmp_bh, 0); - if (err < 0) - return err; - if (!buffer_mapped(&tmp_bh)) /* A hole? */ - memset(data, 0, tocopy); - else { - bh = sb_bread(sb, tmp_bh.b_blocknr); - if (!bh) - return -EIO; - memcpy(data, bh->b_data+offset, tocopy); - brelse(bh); - } - offset = 0; - toread -= tocopy; - data += tocopy; - blk++; - } - return len; -} - -/* Write to quotafile */ -static ssize_t ext2_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]; - sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); - int err = 0; - int offset = off & (sb->s_blocksize - 1); - int tocopy; - size_t towrite = len; - struct buffer_head tmp_bh; - struct buffer_head *bh; - - mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); - while (towrite > 0) { - tocopy = sb->s_blocksize - offset < towrite ? - sb->s_blocksize - offset : towrite; - - tmp_bh.b_state = 0; - err = ext2_get_block(inode, blk, &tmp_bh, 1); - if (err < 0) - goto out; - if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) - bh = sb_bread(sb, tmp_bh.b_blocknr); - else - bh = sb_getblk(sb, tmp_bh.b_blocknr); - if (!bh) { - err = -EIO; - goto out; - } - lock_buffer(bh); - memcpy(bh->b_data+offset, data, tocopy); - flush_dcache_page(bh->b_page); - set_buffer_uptodate(bh); - mark_buffer_dirty(bh); - unlock_buffer(bh); - brelse(bh); - offset = 0; - towrite -= tocopy; - data += tocopy; - blk++; - } -out: - if (len == towrite) { - mutex_unlock(&inode->i_mutex); - return err; - } - if (inode->i_size < off+len-towrite) - i_size_write(inode, off+len-towrite); - inode->i_version++; - inode->i_mtime = inode->i_ctime = CURRENT_TIME; - mark_inode_dirty(inode); - mutex_unlock(&inode->i_mutex); - return len - towrite; -} - -#endif - -static struct file_system_type ext2_fs_type = { - .owner = THIS_MODULE, - .name = "ext2", - .mount = ext2_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; - -static int __init init_ext2_fs(void) -{ - int err = init_ext2_xattr(); - if (err) - return err; - err = init_inodecache(); - if (err) - goto out1; - err = register_filesystem(&ext2_fs_type); - if (err) - goto out; - return 0; -out: - destroy_inodecache(); -out1: - exit_ext2_xattr(); - return err; -} - -static void __exit exit_ext2_fs(void) -{ - unregister_filesystem(&ext2_fs_type); - destroy_inodecache(); - exit_ext2_xattr(); -} - -MODULE_AUTHOR("Remy Card and others"); -MODULE_DESCRIPTION("Second Extended Filesystem"); -MODULE_LICENSE("GPL"); -module_init(init_ext2_fs) -module_exit(exit_ext2_fs) |