diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nilfs2/super.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nilfs2/super.c | 1460 |
1 files changed, 0 insertions, 1460 deletions
diff --git a/ANDROID_3.4.5/fs/nilfs2/super.c b/ANDROID_3.4.5/fs/nilfs2/super.c deleted file mode 100644 index 1099a76c..00000000 --- a/ANDROID_3.4.5/fs/nilfs2/super.c +++ /dev/null @@ -1,1460 +0,0 @@ -/* - * super.c - NILFS module and super block management. - * - * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - * Written by Ryusuke Konishi <ryusuke@osrg.net> - */ -/* - * 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/slab.h> -#include <linux/init.h> -#include <linux/blkdev.h> -#include <linux/parser.h> -#include <linux/crc32.h> -#include <linux/vfs.h> -#include <linux/writeback.h> -#include <linux/seq_file.h> -#include <linux/mount.h> -#include "nilfs.h" -#include "export.h" -#include "mdt.h" -#include "alloc.h" -#include "btree.h" -#include "btnode.h" -#include "page.h" -#include "cpfile.h" -#include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ -#include "ifile.h" -#include "dat.h" -#include "segment.h" -#include "segbuf.h" - -MODULE_AUTHOR("NTT Corp."); -MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " - "(NILFS)"); -MODULE_LICENSE("GPL"); - -static struct kmem_cache *nilfs_inode_cachep; -struct kmem_cache *nilfs_transaction_cachep; -struct kmem_cache *nilfs_segbuf_cachep; -struct kmem_cache *nilfs_btree_path_cache; - -static int nilfs_setup_super(struct super_block *sb, int is_mount); -static int nilfs_remount(struct super_block *sb, int *flags, char *data); - -static void nilfs_set_error(struct super_block *sb) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp; - - down_write(&nilfs->ns_sem); - if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { - nilfs->ns_mount_state |= NILFS_ERROR_FS; - sbp = nilfs_prepare_super(sb, 0); - if (likely(sbp)) { - sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); - if (sbp[1]) - sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); - nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); - } - } - up_write(&nilfs->ns_sem); -} - -/** - * nilfs_error() - report failure condition on a filesystem - * - * nilfs_error() sets an ERROR_FS flag on the superblock as well as - * reporting an error message. It should be called when NILFS detects - * incoherences or defects of meta data on disk. As for sustainable - * errors such as a single-shot I/O error, nilfs_warning() or the printk() - * function should be used instead. - * - * The segment constructor must not call this function because it can - * kill itself. - */ -void nilfs_error(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct va_format vaf; - va_list args; - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); - - if (!(sb->s_flags & MS_RDONLY)) { - nilfs_set_error(sb); - - if (nilfs_test_opt(nilfs, ERRORS_RO)) { - printk(KERN_CRIT "Remounting filesystem read-only\n"); - sb->s_flags |= MS_RDONLY; - } - } - - if (nilfs_test_opt(nilfs, ERRORS_PANIC)) - panic("NILFS (device %s): panic forced after error\n", - sb->s_id); -} - -void nilfs_warning(struct super_block *sb, const char *function, - const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - - vaf.fmt = fmt; - vaf.va = &args; - - printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", - sb->s_id, function, &vaf); - - va_end(args); -} - - -struct inode *nilfs_alloc_inode(struct super_block *sb) -{ - struct nilfs_inode_info *ii; - - ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); - if (!ii) - return NULL; - ii->i_bh = NULL; - ii->i_state = 0; - ii->i_cno = 0; - ii->vfs_inode.i_version = 1; - nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode, sb->s_bdi); - return &ii->vfs_inode; -} - -static void nilfs_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - struct nilfs_mdt_info *mdi = NILFS_MDT(inode); - - if (mdi) { - kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ - kfree(mdi); - } - kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); -} - -void nilfs_destroy_inode(struct inode *inode) -{ - call_rcu(&inode->i_rcu, nilfs_i_callback); -} - -static int nilfs_sync_super(struct super_block *sb, int flag) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - int err; - - retry: - set_buffer_dirty(nilfs->ns_sbh[0]); - if (nilfs_test_opt(nilfs, BARRIER)) { - err = __sync_dirty_buffer(nilfs->ns_sbh[0], - WRITE_SYNC | WRITE_FLUSH_FUA); - } else { - err = sync_dirty_buffer(nilfs->ns_sbh[0]); - } - - if (unlikely(err)) { - printk(KERN_ERR - "NILFS: unable to write superblock (err=%d)\n", err); - if (err == -EIO && nilfs->ns_sbh[1]) { - /* - * sbp[0] points to newer log than sbp[1], - * so copy sbp[0] to sbp[1] to take over sbp[0]. - */ - memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], - nilfs->ns_sbsize); - nilfs_fall_back_super_block(nilfs); - goto retry; - } - } else { - struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; - - nilfs->ns_sbwcount++; - - /* - * The latest segment becomes trailable from the position - * written in superblock. - */ - clear_nilfs_discontinued(nilfs); - - /* update GC protection for recent segments */ - if (nilfs->ns_sbh[1]) { - if (flag == NILFS_SB_COMMIT_ALL) { - set_buffer_dirty(nilfs->ns_sbh[1]); - if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) - goto out; - } - if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < - le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) - sbp = nilfs->ns_sbp[1]; - } - - spin_lock(&nilfs->ns_last_segment_lock); - nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); - spin_unlock(&nilfs->ns_last_segment_lock); - } - out: - return err; -} - -void nilfs_set_log_cursor(struct nilfs_super_block *sbp, - struct the_nilfs *nilfs) -{ - sector_t nfreeblocks; - - /* nilfs->ns_sem must be locked by the caller. */ - nilfs_count_free_blocks(nilfs, &nfreeblocks); - sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); - - spin_lock(&nilfs->ns_last_segment_lock); - sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); - sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); - sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); - spin_unlock(&nilfs->ns_last_segment_lock); -} - -struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, - int flip) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp = nilfs->ns_sbp; - - /* nilfs->ns_sem must be locked by the caller. */ - if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { - if (sbp[1] && - sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { - memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); - } else { - printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", - sb->s_id); - return NULL; - } - } else if (sbp[1] && - sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { - memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); - } - - if (flip && sbp[1]) - nilfs_swap_super_block(nilfs); - - return sbp; -} - -int nilfs_commit_super(struct super_block *sb, int flag) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp = nilfs->ns_sbp; - time_t t; - - /* nilfs->ns_sem must be locked by the caller. */ - t = get_seconds(); - nilfs->ns_sbwtime = t; - sbp[0]->s_wtime = cpu_to_le64(t); - sbp[0]->s_sum = 0; - sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, - (unsigned char *)sbp[0], - nilfs->ns_sbsize)); - if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { - sbp[1]->s_wtime = sbp[0]->s_wtime; - sbp[1]->s_sum = 0; - sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, - (unsigned char *)sbp[1], - nilfs->ns_sbsize)); - } - clear_nilfs_sb_dirty(nilfs); - return nilfs_sync_super(sb, flag); -} - -/** - * nilfs_cleanup_super() - write filesystem state for cleanup - * @sb: super block instance to be unmounted or degraded to read-only - * - * This function restores state flags in the on-disk super block. - * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the - * filesystem was not clean previously. - */ -int nilfs_cleanup_super(struct super_block *sb) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp; - int flag = NILFS_SB_COMMIT; - int ret = -EIO; - - sbp = nilfs_prepare_super(sb, 0); - if (sbp) { - sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); - nilfs_set_log_cursor(sbp[0], nilfs); - if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { - /* - * make the "clean" flag also to the opposite - * super block if both super blocks point to - * the same checkpoint. - */ - sbp[1]->s_state = sbp[0]->s_state; - flag = NILFS_SB_COMMIT_ALL; - } - ret = nilfs_commit_super(sb, flag); - } - return ret; -} - -/** - * nilfs_move_2nd_super - relocate secondary super block - * @sb: super block instance - * @sb2off: new offset of the secondary super block (in bytes) - */ -static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct buffer_head *nsbh; - struct nilfs_super_block *nsbp; - sector_t blocknr, newblocknr; - unsigned long offset; - int sb2i = -1; /* array index of the secondary superblock */ - int ret = 0; - - /* nilfs->ns_sem must be locked by the caller. */ - if (nilfs->ns_sbh[1] && - nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { - sb2i = 1; - blocknr = nilfs->ns_sbh[1]->b_blocknr; - } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { - sb2i = 0; - blocknr = nilfs->ns_sbh[0]->b_blocknr; - } - if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) - goto out; /* super block location is unchanged */ - - /* Get new super block buffer */ - newblocknr = sb2off >> nilfs->ns_blocksize_bits; - offset = sb2off & (nilfs->ns_blocksize - 1); - nsbh = sb_getblk(sb, newblocknr); - if (!nsbh) { - printk(KERN_WARNING - "NILFS warning: unable to move secondary superblock " - "to block %llu\n", (unsigned long long)newblocknr); - ret = -EIO; - goto out; - } - nsbp = (void *)nsbh->b_data + offset; - memset(nsbp, 0, nilfs->ns_blocksize); - - if (sb2i >= 0) { - memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); - brelse(nilfs->ns_sbh[sb2i]); - nilfs->ns_sbh[sb2i] = nsbh; - nilfs->ns_sbp[sb2i] = nsbp; - } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { - /* secondary super block will be restored to index 1 */ - nilfs->ns_sbh[1] = nsbh; - nilfs->ns_sbp[1] = nsbp; - } else { - brelse(nsbh); - } -out: - return ret; -} - -/** - * nilfs_resize_fs - resize the filesystem - * @sb: super block instance - * @newsize: new size of the filesystem (in bytes) - */ -int nilfs_resize_fs(struct super_block *sb, __u64 newsize) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp; - __u64 devsize, newnsegs; - loff_t sb2off; - int ret; - - ret = -ERANGE; - devsize = i_size_read(sb->s_bdev->bd_inode); - if (newsize > devsize) - goto out; - - /* - * Write lock is required to protect some functions depending - * on the number of segments, the number of reserved segments, - * and so forth. - */ - down_write(&nilfs->ns_segctor_sem); - - sb2off = NILFS_SB2_OFFSET_BYTES(newsize); - newnsegs = sb2off >> nilfs->ns_blocksize_bits; - do_div(newnsegs, nilfs->ns_blocks_per_segment); - - ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); - up_write(&nilfs->ns_segctor_sem); - if (ret < 0) - goto out; - - ret = nilfs_construct_segment(sb); - if (ret < 0) - goto out; - - down_write(&nilfs->ns_sem); - nilfs_move_2nd_super(sb, sb2off); - ret = -EIO; - sbp = nilfs_prepare_super(sb, 0); - if (likely(sbp)) { - nilfs_set_log_cursor(sbp[0], nilfs); - /* - * Drop NILFS_RESIZE_FS flag for compatibility with - * mount-time resize which may be implemented in a - * future release. - */ - sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & - ~NILFS_RESIZE_FS); - sbp[0]->s_dev_size = cpu_to_le64(newsize); - sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); - if (sbp[1]) - memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); - ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); - } - up_write(&nilfs->ns_sem); - - /* - * Reset the range of allocatable segments last. This order - * is important in the case of expansion because the secondary - * superblock must be protected from log write until migration - * completes. - */ - if (!ret) - nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); -out: - return ret; -} - -static void nilfs_put_super(struct super_block *sb) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - - nilfs_detach_log_writer(sb); - - if (!(sb->s_flags & MS_RDONLY)) { - down_write(&nilfs->ns_sem); - nilfs_cleanup_super(sb); - up_write(&nilfs->ns_sem); - } - - iput(nilfs->ns_sufile); - iput(nilfs->ns_cpfile); - iput(nilfs->ns_dat); - - destroy_nilfs(nilfs); - sb->s_fs_info = NULL; -} - -static int nilfs_sync_fs(struct super_block *sb, int wait) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp; - int err = 0; - - /* This function is called when super block should be written back */ - if (wait) - err = nilfs_construct_segment(sb); - - down_write(&nilfs->ns_sem); - if (nilfs_sb_dirty(nilfs)) { - sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); - if (likely(sbp)) { - nilfs_set_log_cursor(sbp[0], nilfs); - nilfs_commit_super(sb, NILFS_SB_COMMIT); - } - } - up_write(&nilfs->ns_sem); - - return err; -} - -int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, - struct nilfs_root **rootp) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_root *root; - struct nilfs_checkpoint *raw_cp; - struct buffer_head *bh_cp; - int err = -ENOMEM; - - root = nilfs_find_or_create_root( - nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); - if (!root) - return err; - - if (root->ifile) - goto reuse; /* already attached checkpoint */ - - down_read(&nilfs->ns_segctor_sem); - err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, - &bh_cp); - up_read(&nilfs->ns_segctor_sem); - if (unlikely(err)) { - if (err == -ENOENT || err == -EINVAL) { - printk(KERN_ERR - "NILFS: Invalid checkpoint " - "(checkpoint number=%llu)\n", - (unsigned long long)cno); - err = -EINVAL; - } - goto failed; - } - - err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size, - &raw_cp->cp_ifile_inode, &root->ifile); - if (err) - goto failed_bh; - - atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); - atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); - - nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); - - reuse: - *rootp = root; - return 0; - - failed_bh: - nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); - failed: - nilfs_put_root(root); - - return err; -} - -static int nilfs_freeze(struct super_block *sb) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - int err; - - if (sb->s_flags & MS_RDONLY) - return 0; - - /* Mark super block clean */ - down_write(&nilfs->ns_sem); - err = nilfs_cleanup_super(sb); - up_write(&nilfs->ns_sem); - return err; -} - -static int nilfs_unfreeze(struct super_block *sb) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - - if (sb->s_flags & MS_RDONLY) - return 0; - - down_write(&nilfs->ns_sem); - nilfs_setup_super(sb, false); - up_write(&nilfs->ns_sem); - return 0; -} - -static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; - struct the_nilfs *nilfs = root->nilfs; - u64 id = huge_encode_dev(sb->s_bdev->bd_dev); - unsigned long long blocks; - unsigned long overhead; - unsigned long nrsvblocks; - sector_t nfreeblocks; - int err; - - /* - * Compute all of the segment blocks - * - * The blocks before first segment and after last segment - * are excluded. - */ - blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments - - nilfs->ns_first_data_block; - nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; - - /* - * Compute the overhead - * - * When distributing meta data blocks outside segment structure, - * We must count them as the overhead. - */ - overhead = 0; - - err = nilfs_count_free_blocks(nilfs, &nfreeblocks); - if (unlikely(err)) - return err; - - buf->f_type = NILFS_SUPER_MAGIC; - buf->f_bsize = sb->s_blocksize; - buf->f_blocks = blocks - overhead; - buf->f_bfree = nfreeblocks; - buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? - (buf->f_bfree - nrsvblocks) : 0; - buf->f_files = atomic_read(&root->inodes_count); - buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ - buf->f_namelen = NILFS_NAME_LEN; - buf->f_fsid.val[0] = (u32)id; - buf->f_fsid.val[1] = (u32)(id >> 32); - - return 0; -} - -static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) -{ - struct super_block *sb = dentry->d_sb; - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; - - if (!nilfs_test_opt(nilfs, BARRIER)) - seq_puts(seq, ",nobarrier"); - if (root->cno != NILFS_CPTREE_CURRENT_CNO) - seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); - if (nilfs_test_opt(nilfs, ERRORS_PANIC)) - seq_puts(seq, ",errors=panic"); - if (nilfs_test_opt(nilfs, ERRORS_CONT)) - seq_puts(seq, ",errors=continue"); - if (nilfs_test_opt(nilfs, STRICT_ORDER)) - seq_puts(seq, ",order=strict"); - if (nilfs_test_opt(nilfs, NORECOVERY)) - seq_puts(seq, ",norecovery"); - if (nilfs_test_opt(nilfs, DISCARD)) - seq_puts(seq, ",discard"); - - return 0; -} - -static const struct super_operations nilfs_sops = { - .alloc_inode = nilfs_alloc_inode, - .destroy_inode = nilfs_destroy_inode, - .dirty_inode = nilfs_dirty_inode, - /* .write_inode = nilfs_write_inode, */ - /* .put_inode = nilfs_put_inode, */ - /* .drop_inode = nilfs_drop_inode, */ - .evict_inode = nilfs_evict_inode, - .put_super = nilfs_put_super, - /* .write_super = nilfs_write_super, */ - .sync_fs = nilfs_sync_fs, - .freeze_fs = nilfs_freeze, - .unfreeze_fs = nilfs_unfreeze, - /* .write_super_lockfs */ - /* .unlockfs */ - .statfs = nilfs_statfs, - .remount_fs = nilfs_remount, - /* .umount_begin */ - .show_options = nilfs_show_options -}; - -enum { - Opt_err_cont, Opt_err_panic, Opt_err_ro, - Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, - Opt_discard, Opt_nodiscard, Opt_err, -}; - -static match_table_t tokens = { - {Opt_err_cont, "errors=continue"}, - {Opt_err_panic, "errors=panic"}, - {Opt_err_ro, "errors=remount-ro"}, - {Opt_barrier, "barrier"}, - {Opt_nobarrier, "nobarrier"}, - {Opt_snapshot, "cp=%u"}, - {Opt_order, "order=%s"}, - {Opt_norecovery, "norecovery"}, - {Opt_discard, "discard"}, - {Opt_nodiscard, "nodiscard"}, - {Opt_err, NULL} -}; - -static int parse_options(char *options, struct super_block *sb, int is_remount) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - char *p; - substring_t args[MAX_OPT_ARGS]; - - if (!options) - return 1; - - while ((p = strsep(&options, ",")) != NULL) { - int token; - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - case Opt_barrier: - nilfs_set_opt(nilfs, BARRIER); - break; - case Opt_nobarrier: - nilfs_clear_opt(nilfs, BARRIER); - break; - case Opt_order: - if (strcmp(args[0].from, "relaxed") == 0) - /* Ordered data semantics */ - nilfs_clear_opt(nilfs, STRICT_ORDER); - else if (strcmp(args[0].from, "strict") == 0) - /* Strict in-order semantics */ - nilfs_set_opt(nilfs, STRICT_ORDER); - else - return 0; - break; - case Opt_err_panic: - nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC); - break; - case Opt_err_ro: - nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO); - break; - case Opt_err_cont: - nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT); - break; - case Opt_snapshot: - if (is_remount) { - printk(KERN_ERR - "NILFS: \"%s\" option is invalid " - "for remount.\n", p); - return 0; - } - break; - case Opt_norecovery: - nilfs_set_opt(nilfs, NORECOVERY); - break; - case Opt_discard: - nilfs_set_opt(nilfs, DISCARD); - break; - case Opt_nodiscard: - nilfs_clear_opt(nilfs, DISCARD); - break; - default: - printk(KERN_ERR - "NILFS: Unrecognized mount option \"%s\"\n", p); - return 0; - } - } - return 1; -} - -static inline void -nilfs_set_default_options(struct super_block *sb, - struct nilfs_super_block *sbp) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - - nilfs->ns_mount_opt = - NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; -} - -static int nilfs_setup_super(struct super_block *sb, int is_mount) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_super_block **sbp; - int max_mnt_count; - int mnt_count; - - /* nilfs->ns_sem must be locked by the caller. */ - sbp = nilfs_prepare_super(sb, 0); - if (!sbp) - return -EIO; - - if (!is_mount) - goto skip_mount_setup; - - max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); - mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); - - if (nilfs->ns_mount_state & NILFS_ERROR_FS) { - printk(KERN_WARNING - "NILFS warning: mounting fs with errors\n"); -#if 0 - } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { - printk(KERN_WARNING - "NILFS warning: maximal mount count reached\n"); -#endif - } - if (!max_mnt_count) - sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); - - sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); - sbp[0]->s_mtime = cpu_to_le64(get_seconds()); - -skip_mount_setup: - sbp[0]->s_state = - cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); - /* synchronize sbp[1] with sbp[0] */ - if (sbp[1]) - memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); - return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); -} - -struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, - u64 pos, int blocksize, - struct buffer_head **pbh) -{ - unsigned long long sb_index = pos; - unsigned long offset; - - offset = do_div(sb_index, blocksize); - *pbh = sb_bread(sb, sb_index); - if (!*pbh) - return NULL; - return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); -} - -int nilfs_store_magic_and_option(struct super_block *sb, - struct nilfs_super_block *sbp, - char *data) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - - sb->s_magic = le16_to_cpu(sbp->s_magic); - - /* FS independent flags */ -#ifdef NILFS_ATIME_DISABLE - sb->s_flags |= MS_NOATIME; -#endif - - nilfs_set_default_options(sb, sbp); - - nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); - nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); - nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); - nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); - - return !parse_options(data, sb, 0) ? -EINVAL : 0 ; -} - -int nilfs_check_feature_compatibility(struct super_block *sb, - struct nilfs_super_block *sbp) -{ - __u64 features; - - features = le64_to_cpu(sbp->s_feature_incompat) & - ~NILFS_FEATURE_INCOMPAT_SUPP; - if (features) { - printk(KERN_ERR "NILFS: couldn't mount because of unsupported " - "optional features (%llx)\n", - (unsigned long long)features); - return -EINVAL; - } - features = le64_to_cpu(sbp->s_feature_compat_ro) & - ~NILFS_FEATURE_COMPAT_RO_SUPP; - if (!(sb->s_flags & MS_RDONLY) && features) { - printk(KERN_ERR "NILFS: couldn't mount RDWR because of " - "unsupported optional features (%llx)\n", - (unsigned long long)features); - return -EINVAL; - } - return 0; -} - -static int nilfs_get_root_dentry(struct super_block *sb, - struct nilfs_root *root, - struct dentry **root_dentry) -{ - struct inode *inode; - struct dentry *dentry; - int ret = 0; - - inode = nilfs_iget(sb, root, NILFS_ROOT_INO); - if (IS_ERR(inode)) { - printk(KERN_ERR "NILFS: get root inode failed\n"); - ret = PTR_ERR(inode); - goto out; - } - if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { - iput(inode); - printk(KERN_ERR "NILFS: corrupt root inode.\n"); - ret = -EINVAL; - goto out; - } - - if (root->cno == NILFS_CPTREE_CURRENT_CNO) { - dentry = d_find_alias(inode); - if (!dentry) { - dentry = d_make_root(inode); - if (!dentry) { - ret = -ENOMEM; - goto failed_dentry; - } - } else { - iput(inode); - } - } else { - dentry = d_obtain_alias(inode); - if (IS_ERR(dentry)) { - ret = PTR_ERR(dentry); - goto failed_dentry; - } - } - *root_dentry = dentry; - out: - return ret; - - failed_dentry: - printk(KERN_ERR "NILFS: get root dentry failed\n"); - goto out; -} - -static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, - struct dentry **root_dentry) -{ - struct the_nilfs *nilfs = s->s_fs_info; - struct nilfs_root *root; - int ret; - - down_read(&nilfs->ns_segctor_sem); - ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); - up_read(&nilfs->ns_segctor_sem); - if (ret < 0) { - ret = (ret == -ENOENT) ? -EINVAL : ret; - goto out; - } else if (!ret) { - printk(KERN_ERR "NILFS: The specified checkpoint is " - "not a snapshot (checkpoint number=%llu).\n", - (unsigned long long)cno); - ret = -EINVAL; - goto out; - } - - ret = nilfs_attach_checkpoint(s, cno, false, &root); - if (ret) { - printk(KERN_ERR "NILFS: error loading snapshot " - "(checkpoint number=%llu).\n", - (unsigned long long)cno); - goto out; - } - ret = nilfs_get_root_dentry(s, root, root_dentry); - nilfs_put_root(root); - out: - return ret; -} - -static int nilfs_tree_was_touched(struct dentry *root_dentry) -{ - return root_dentry->d_count > 1; -} - -/** - * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint - * @root_dentry: root dentry of the tree to be shrunk - * - * This function returns true if the tree was in-use. - */ -static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) -{ - if (have_submounts(root_dentry)) - return true; - shrink_dcache_parent(root_dentry); - return nilfs_tree_was_touched(root_dentry); -} - -int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - struct nilfs_root *root; - struct inode *inode; - struct dentry *dentry; - int ret; - - if (cno < 0 || cno > nilfs->ns_cno) - return false; - - if (cno >= nilfs_last_cno(nilfs)) - return true; /* protect recent checkpoints */ - - ret = false; - root = nilfs_lookup_root(nilfs, cno); - if (root) { - inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); - if (inode) { - dentry = d_find_alias(inode); - if (dentry) { - if (nilfs_tree_was_touched(dentry)) - ret = nilfs_try_to_shrink_tree(dentry); - dput(dentry); - } - iput(inode); - } - nilfs_put_root(root); - } - return ret; -} - -/** - * nilfs_fill_super() - initialize a super block instance - * @sb: super_block - * @data: mount options - * @silent: silent mode flag - * - * This function is called exclusively by nilfs->ns_mount_mutex. - * So, the recovery process is protected from other simultaneous mounts. - */ -static int -nilfs_fill_super(struct super_block *sb, void *data, int silent) -{ - struct the_nilfs *nilfs; - struct nilfs_root *fsroot; - struct backing_dev_info *bdi; - __u64 cno; - int err; - - nilfs = alloc_nilfs(sb->s_bdev); - if (!nilfs) - return -ENOMEM; - - sb->s_fs_info = nilfs; - - err = init_nilfs(nilfs, sb, (char *)data); - if (err) - goto failed_nilfs; - - sb->s_op = &nilfs_sops; - sb->s_export_op = &nilfs_export_ops; - sb->s_root = NULL; - sb->s_time_gran = 1; - sb->s_max_links = NILFS_LINK_MAX; - - bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; - sb->s_bdi = bdi ? : &default_backing_dev_info; - - err = load_nilfs(nilfs, sb); - if (err) - goto failed_nilfs; - - cno = nilfs_last_cno(nilfs); - err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); - if (err) { - printk(KERN_ERR "NILFS: error loading last checkpoint " - "(checkpoint number=%llu).\n", (unsigned long long)cno); - goto failed_unload; - } - - if (!(sb->s_flags & MS_RDONLY)) { - err = nilfs_attach_log_writer(sb, fsroot); - if (err) - goto failed_checkpoint; - } - - err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); - if (err) - goto failed_segctor; - - nilfs_put_root(fsroot); - - if (!(sb->s_flags & MS_RDONLY)) { - down_write(&nilfs->ns_sem); - nilfs_setup_super(sb, true); - up_write(&nilfs->ns_sem); - } - - return 0; - - failed_segctor: - nilfs_detach_log_writer(sb); - - failed_checkpoint: - nilfs_put_root(fsroot); - - failed_unload: - iput(nilfs->ns_sufile); - iput(nilfs->ns_cpfile); - iput(nilfs->ns_dat); - - failed_nilfs: - destroy_nilfs(nilfs); - return err; -} - -static int nilfs_remount(struct super_block *sb, int *flags, char *data) -{ - struct the_nilfs *nilfs = sb->s_fs_info; - unsigned long old_sb_flags; - unsigned long old_mount_opt; - int err; - - old_sb_flags = sb->s_flags; - old_mount_opt = nilfs->ns_mount_opt; - - if (!parse_options(data, sb, 1)) { - err = -EINVAL; - goto restore_opts; - } - sb->s_flags = (sb->s_flags & ~MS_POSIXACL); - - err = -EINVAL; - - if (!nilfs_valid_fs(nilfs)) { - printk(KERN_WARNING "NILFS (device %s): couldn't " - "remount because the filesystem is in an " - "incomplete recovery state.\n", sb->s_id); - goto restore_opts; - } - - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) - goto out; - if (*flags & MS_RDONLY) { - /* Shutting down log writer */ - nilfs_detach_log_writer(sb); - sb->s_flags |= MS_RDONLY; - - /* - * Remounting a valid RW partition RDONLY, so set - * the RDONLY flag and then mark the partition as valid again. - */ - down_write(&nilfs->ns_sem); - nilfs_cleanup_super(sb); - up_write(&nilfs->ns_sem); - } else { - __u64 features; - struct nilfs_root *root; - - /* - * Mounting a RDONLY partition read-write, so reread and - * store the current valid flag. (It may have been changed - * by fsck since we originally mounted the partition.) - */ - down_read(&nilfs->ns_sem); - features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & - ~NILFS_FEATURE_COMPAT_RO_SUPP; - up_read(&nilfs->ns_sem); - if (features) { - printk(KERN_WARNING "NILFS (device %s): couldn't " - "remount RDWR because of unsupported optional " - "features (%llx)\n", - sb->s_id, (unsigned long long)features); - err = -EROFS; - goto restore_opts; - } - - sb->s_flags &= ~MS_RDONLY; - - root = NILFS_I(sb->s_root->d_inode)->i_root; - err = nilfs_attach_log_writer(sb, root); - if (err) - goto restore_opts; - - down_write(&nilfs->ns_sem); - nilfs_setup_super(sb, true); - up_write(&nilfs->ns_sem); - } - out: - return 0; - - restore_opts: - sb->s_flags = old_sb_flags; - nilfs->ns_mount_opt = old_mount_opt; - return err; -} - -struct nilfs_super_data { - struct block_device *bdev; - __u64 cno; - int flags; -}; - -/** - * nilfs_identify - pre-read mount options needed to identify mount instance - * @data: mount options - * @sd: nilfs_super_data - */ -static int nilfs_identify(char *data, struct nilfs_super_data *sd) -{ - char *p, *options = data; - substring_t args[MAX_OPT_ARGS]; - int token; - int ret = 0; - - do { - p = strsep(&options, ","); - if (p != NULL && *p) { - token = match_token(p, tokens, args); - if (token == Opt_snapshot) { - if (!(sd->flags & MS_RDONLY)) { - ret++; - } else { - sd->cno = simple_strtoull(args[0].from, - NULL, 0); - /* - * No need to see the end pointer; - * match_token() has done syntax - * checking. - */ - if (sd->cno == 0) - ret++; - } - } - if (ret) - printk(KERN_ERR - "NILFS: invalid mount option: %s\n", p); - } - if (!options) - break; - BUG_ON(options == data); - *(options - 1) = ','; - } while (!ret); - return ret; -} - -static int nilfs_set_bdev_super(struct super_block *s, void *data) -{ - s->s_bdev = data; - s->s_dev = s->s_bdev->bd_dev; - return 0; -} - -static int nilfs_test_bdev_super(struct super_block *s, void *data) -{ - return (void *)s->s_bdev == data; -} - -static struct dentry * -nilfs_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data) -{ - struct nilfs_super_data sd; - struct super_block *s; - fmode_t mode = FMODE_READ | FMODE_EXCL; - struct dentry *root_dentry; - int err, s_new = false; - - if (!(flags & MS_RDONLY)) - mode |= FMODE_WRITE; - - sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); - if (IS_ERR(sd.bdev)) - return ERR_CAST(sd.bdev); - - sd.cno = 0; - sd.flags = flags; - if (nilfs_identify((char *)data, &sd)) { - err = -EINVAL; - goto failed; - } - - /* - * once the super is inserted into the list by sget, s_umount - * will protect the lockfs code from trying to start a snapshot - * while we are mounting - */ - mutex_lock(&sd.bdev->bd_fsfreeze_mutex); - if (sd.bdev->bd_fsfreeze_count > 0) { - mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); - err = -EBUSY; - goto failed; - } - s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); - mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); - if (IS_ERR(s)) { - err = PTR_ERR(s); - goto failed; - } - - if (!s->s_root) { - char b[BDEVNAME_SIZE]; - - s_new = true; - - /* New superblock instance created */ - s->s_flags = flags; - s->s_mode = mode; - strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); - sb_set_blocksize(s, block_size(sd.bdev)); - - err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); - if (err) - goto failed_super; - - s->s_flags |= MS_ACTIVE; - } else if (!sd.cno) { - int busy = false; - - if (nilfs_tree_was_touched(s->s_root)) { - busy = nilfs_try_to_shrink_tree(s->s_root); - if (busy && (flags ^ s->s_flags) & MS_RDONLY) { - printk(KERN_ERR "NILFS: the device already " - "has a %s mount.\n", - (s->s_flags & MS_RDONLY) ? - "read-only" : "read/write"); - err = -EBUSY; - goto failed_super; - } - } - if (!busy) { - /* - * Try remount to setup mount states if the current - * tree is not mounted and only snapshots use this sb. - */ - err = nilfs_remount(s, &flags, data); - if (err) - goto failed_super; - } - } - - if (sd.cno) { - err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); - if (err) - goto failed_super; - } else { - root_dentry = dget(s->s_root); - } - - if (!s_new) - blkdev_put(sd.bdev, mode); - - return root_dentry; - - failed_super: - deactivate_locked_super(s); - - failed: - if (!s_new) - blkdev_put(sd.bdev, mode); - return ERR_PTR(err); -} - -struct file_system_type nilfs_fs_type = { - .owner = THIS_MODULE, - .name = "nilfs2", - .mount = nilfs_mount, - .kill_sb = kill_block_super, - .fs_flags = FS_REQUIRES_DEV, -}; - -static void nilfs_inode_init_once(void *obj) -{ - struct nilfs_inode_info *ii = obj; - - INIT_LIST_HEAD(&ii->i_dirty); -#ifdef CONFIG_NILFS_XATTR - init_rwsem(&ii->xattr_sem); -#endif - address_space_init_once(&ii->i_btnode_cache); - ii->i_bmap = &ii->i_bmap_data; - inode_init_once(&ii->vfs_inode); -} - -static void nilfs_segbuf_init_once(void *obj) -{ - memset(obj, 0, sizeof(struct nilfs_segment_buffer)); -} - -static void nilfs_destroy_cachep(void) -{ - if (nilfs_inode_cachep) - kmem_cache_destroy(nilfs_inode_cachep); - if (nilfs_transaction_cachep) - kmem_cache_destroy(nilfs_transaction_cachep); - if (nilfs_segbuf_cachep) - kmem_cache_destroy(nilfs_segbuf_cachep); - if (nilfs_btree_path_cache) - kmem_cache_destroy(nilfs_btree_path_cache); -} - -static int __init nilfs_init_cachep(void) -{ - nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", - sizeof(struct nilfs_inode_info), 0, - SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); - if (!nilfs_inode_cachep) - goto fail; - - nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", - sizeof(struct nilfs_transaction_info), 0, - SLAB_RECLAIM_ACCOUNT, NULL); - if (!nilfs_transaction_cachep) - goto fail; - - nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", - sizeof(struct nilfs_segment_buffer), 0, - SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); - if (!nilfs_segbuf_cachep) - goto fail; - - nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", - sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, - 0, 0, NULL); - if (!nilfs_btree_path_cache) - goto fail; - - return 0; - -fail: - nilfs_destroy_cachep(); - return -ENOMEM; -} - -static int __init init_nilfs_fs(void) -{ - int err; - - err = nilfs_init_cachep(); - if (err) - goto fail; - - err = register_filesystem(&nilfs_fs_type); - if (err) - goto free_cachep; - - printk(KERN_INFO "NILFS version 2 loaded\n"); - return 0; - -free_cachep: - nilfs_destroy_cachep(); -fail: - return err; -} - -static void __exit exit_nilfs_fs(void) -{ - nilfs_destroy_cachep(); - unregister_filesystem(&nilfs_fs_type); -} - -module_init(init_nilfs_fs) -module_exit(exit_nilfs_fs) |