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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 

Pull ext2, ext3 and quota fixes from Jan Kara:
 "Interesting bits are:
   - removal of a special i_mutex locking subclass (I_MUTEX_QUOTA) since
     quota code does not need i_mutex anymore in any unusual way.
   - backport (from ext4) of a fix of a checkpointing bug (missing cache
     flush) that could lead to fs corruption on power failure

  The rest are just random small fixes & cleanups."

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ext2: trivial fix to comment for ext2_free_blocks
  ext2: remove the redundant comment for ext2_export_ops
  ext3: return 32/64-bit dir name hash according to usage type
  quota: Get rid of nested I_MUTEX_QUOTA locking subclass
  quota: Use precomputed value of sb_dqopt in dquot_quota_sync
  ext2: Remove i_mutex use from ext2_quota_write()
  reiserfs: Remove i_mutex use from reiserfs_quota_write()
  ext4: Remove i_mutex use from ext4_quota_write()
  ext3: Remove i_mutex use from ext3_quota_write()
  quota: Fix double lock in add_dquot_ref() with CONFIG_QUOTA_DEBUG
  jbd: Write journal superblock with WRITE_FUA after checkpointing
  jbd: protect all log tail updates with j_checkpoint_mutex
  jbd: Split updating of journal superblock and marking journal empty
  ext2: do not register write_super within VFS
  ext2: Remove s_dirt handling
  ext2: write superblock only once on unmount
  ext3: update documentation with barrier=1 default
  ext3: remove max_debt in find_group_orlov()
  jbd: Refine commit writeout logic
This commit is contained in:
Linus Torvalds 2012-05-25 08:14:59 -07:00
parent 07acfc2a93 0324876628
commit ece78b7df7
19 changed files with 343 additions and 246 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/filesystems/ext3.txt
View File

@ -59,9 +59,9 @@ commit=nrsec (*) Ext3 can be told to sync all its data and metadata
Setting it to very large values will improve
performance.
barrier=<0(*)|1> This enables/disables the use of write barriers in
barrier the jbd code. barrier=0 disables, barrier=1 enables.
nobarrier (*) This also requires an IO stack which can support
barrier=<0|1(*)> This enables/disables the use of write barriers in
barrier (*) the jbd code. barrier=0 disables, barrier=1 enables.
nobarrier This also requires an IO stack which can support
barriers, and if jbd gets an error on a barrier
write, it will disable again with a warning.
Write barriers enforce proper on-disk ordering

4
fs/ext2/balloc.c
View File

@ -165,7 +165,6 @@ static void release_blocks(struct super_block *sb, int count)
struct ext2_sb_info *sbi = EXT2_SB(sb);
percpu_counter_add(&sbi->s_freeblocks_counter, count);
sb->s_dirt = 1;
}
}
@ -180,7 +179,6 @@ static void group_adjust_blocks(struct super_block *sb, int group_no,
free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
desc->bg_free_blocks_count = cpu_to_le16(free_blocks + count);
spin_unlock(sb_bgl_lock(sbi, group_no));
sb->s_dirt = 1;
mark_buffer_dirty(bh);
}
}
@ -479,7 +477,7 @@ void ext2_discard_reservation(struct inode *inode)
}
/**
* ext2_free_blocks_sb() -- Free given blocks and update quota and i_blocks
* ext2_free_blocks() -- Free given blocks and update quota and i_blocks
* @inode: inode
* @block: start physcial block to free
* @count: number of blocks to free

2
fs/ext2/ialloc.c
View File

@ -81,7 +81,6 @@ static void ext2_release_inode(struct super_block *sb, int group, int dir)
spin_unlock(sb_bgl_lock(EXT2_SB(sb), group));
if (dir)
percpu_counter_dec(&EXT2_SB(sb)->s_dirs_counter);
sb->s_dirt = 1;
mark_buffer_dirty(bh);
}
@ -543,7 +542,6 @@ got:
}
spin_unlock(sb_bgl_lock(sbi, group));
sb->s_dirt = 1;
mark_buffer_dirty(bh2);
if (test_opt(sb, GRPID)) {
inode->i_mode = mode;

18
fs/ext2/super.c
View File

@ -130,9 +130,6 @@ static void ext2_put_super (struct super_block * 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;
@ -307,7 +304,6 @@ static const struct super_operations ext2_sops = {
.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,
@ -358,11 +354,6 @@ static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
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,
@ -1176,7 +1167,6 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
if (wait)
sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
sb->s_dirt = 0;
}
/*
@ -1209,8 +1199,6 @@ 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)
@ -1456,7 +1444,6 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
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;
@ -1486,16 +1473,13 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
blk++;
}
out:
if (len == towrite) {
mutex_unlock(&inode->i_mutex);
if (len == towrite)
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;
}

1
fs/ext2/xattr.c
View File

@ -339,7 +339,6 @@ static void ext2_xattr_update_super_block(struct super_block *sb)
spin_lock(&EXT2_SB(sb)->s_lock);
EXT2_SET_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR);
spin_unlock(&EXT2_SB(sb)->s_lock);
sb->s_dirt = 1;
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
}

167
fs/ext3/dir.c
View File

@ -21,30 +21,15 @@
*
*/
#include <linux/compat.h>
#include "ext3.h"
static unsigned char ext3_filetype_table[] = {
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};
static int ext3_readdir(struct file *, void *, filldir_t);
static int ext3_dx_readdir(struct file * filp,
void * dirent, filldir_t filldir);
static int ext3_release_dir (struct inode * inode,
struct file * filp);
const struct file_operations ext3_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext3_readdir, /* we take BKL. needed?*/
.unlocked_ioctl = ext3_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
.fsync = ext3_sync_file, /* BKL held */
.release = ext3_release_dir,
};
static unsigned char get_dtype(struct super_block *sb, int filetype)
{
@ -55,6 +40,25 @@ static unsigned char get_dtype(struct super_block *sb, int filetype)
return (ext3_filetype_table[filetype]);
}
/**
* Check if the given dir-inode refers to an htree-indexed directory
* (or a directory which chould potentially get coverted to use htree
* indexing).
*
* Return 1 if it is a dx dir, 0 if not
*/
static int is_dx_dir(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
EXT3_FEATURE_COMPAT_DIR_INDEX) &&
((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) ||
((inode->i_size >> sb->s_blocksize_bits) == 1)))
return 1;
return 0;
}
int ext3_check_dir_entry (const char * function, struct inode * dir,
struct ext3_dir_entry_2 * de,
@ -94,18 +98,13 @@ static int ext3_readdir(struct file * filp,
unsigned long offset;
int i, stored;
struct ext3_dir_entry_2 *de;
struct super_block *sb;
int err;
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
int ret = 0;
int dir_has_error = 0;
sb = inode->i_sb;
if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
EXT3_FEATURE_COMPAT_DIR_INDEX) &&
((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) ||
((inode->i_size >> sb->s_blocksize_bits) == 1))) {
if (is_dx_dir(inode)) {
err = ext3_dx_readdir(filp, dirent, filldir);
if (err != ERR_BAD_DX_DIR) {
ret = err;
@ -227,22 +226,87 @@ out:
return ret;
}
static inline int is_32bit_api(void)
{
#ifdef CONFIG_COMPAT
return is_compat_task();
#else
return (BITS_PER_LONG == 32);
#endif
}
/*
* These functions convert from the major/minor hash to an f_pos
* value.
* value for dx directories
*
* Currently we only use major hash numer. This is unfortunate, but
* on 32-bit machines, the same VFS interface is used for lseek and
* llseek, so if we use the 64 bit offset, then the 32-bit versions of
* lseek/telldir/seekdir will blow out spectacularly, and from within
* the ext2 low-level routine, we don't know if we're being called by
* a 64-bit version of the system call or the 32-bit version of the
* system call. Worse yet, NFSv2 only allows for a 32-bit readdir
* cookie. Sigh.
* Upper layer (for example NFS) should specify FMODE_32BITHASH or
* FMODE_64BITHASH explicitly. On the other hand, we allow ext3 to be mounted
* directly on both 32-bit and 64-bit nodes, under such case, neither
* FMODE_32BITHASH nor FMODE_64BITHASH is specified.
*/
#define hash2pos(major, minor) (major >> 1)
#define pos2maj_hash(pos) ((pos << 1) & 0xffffffff)
#define pos2min_hash(pos) (0)
static inline loff_t hash2pos(struct file *filp, __u32 major, __u32 minor)
{
if ((filp->f_mode & FMODE_32BITHASH) ||
(!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api()))
return major >> 1;
else
return ((__u64)(major >> 1) << 32) | (__u64)minor;
}
static inline __u32 pos2maj_hash(struct file *filp, loff_t pos)
{
if ((filp->f_mode & FMODE_32BITHASH) ||
(!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api()))
return (pos << 1) & 0xffffffff;
else
return ((pos >> 32) << 1) & 0xffffffff;
}
static inline __u32 pos2min_hash(struct file *filp, loff_t pos)
{
if ((filp->f_mode & FMODE_32BITHASH) ||
(!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api()))
return 0;
else
return pos & 0xffffffff;
}
/*
* Return 32- or 64-bit end-of-file for dx directories
*/
static inline loff_t ext3_get_htree_eof(struct file *filp)
{
if ((filp->f_mode & FMODE_32BITHASH) ||
(!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api()))
return EXT3_HTREE_EOF_32BIT;
else
return EXT3_HTREE_EOF_64BIT;
}
/*
* ext3_dir_llseek() calls generic_file_llseek[_size]() to handle both
* non-htree and htree directories, where the "offset" is in terms
* of the filename hash value instead of the byte offset.
*
* Because we may return a 64-bit hash that is well beyond s_maxbytes,
* we need to pass the max hash as the maximum allowable offset in
* the htree directory case.
*
* NOTE: offsets obtained *before* ext3_set_inode_flag(dir, EXT3_INODE_INDEX)
* will be invalid once the directory was converted into a dx directory
*/
loff_t ext3_dir_llseek(struct file *file, loff_t offset, int origin)
{
struct inode *inode = file->f_mapping->host;
int dx_dir = is_dx_dir(inode);
if (likely(dx_dir))
return generic_file_llseek_size(file, offset, origin,
ext3_get_htree_eof(file));
else
return generic_file_llseek(file, offset, origin);
}
/*
* This structure holds the nodes of the red-black tree used to store
@ -303,15 +367,16 @@ static void free_rb_tree_fname(struct rb_root *root)
}
static struct dir_private_info *ext3_htree_create_dir_info(loff_t pos)
static struct dir_private_info *ext3_htree_create_dir_info(struct file *filp,
loff_t pos)
{
struct dir_private_info *p;
p = kzalloc(sizeof(struct dir_private_info), GFP_KERNEL);
if (!p)
return NULL;
p->curr_hash = pos2maj_hash(pos);
p->curr_minor_hash = pos2min_hash(pos);
p->curr_hash = pos2maj_hash(filp, pos);
p->curr_minor_hash = pos2min_hash(filp, pos);
return p;
}
@ -401,7 +466,7 @@ static int call_filldir(struct file * filp, void * dirent,
printk("call_filldir: called with null fname?!?\n");
return 0;
}
curr_pos = hash2pos(fname->hash, fname->minor_hash);
curr_pos = hash2pos(filp, fname->hash, fname->minor_hash);
while (fname) {
error = filldir(dirent, fname->name,
fname->name_len, curr_pos,
@ -426,13 +491,13 @@ static int ext3_dx_readdir(struct file * filp,
int ret;
if (!info) {
info = ext3_htree_create_dir_info(filp->f_pos);
info = ext3_htree_create_dir_info(filp, filp->f_pos);
if (!info)
return -ENOMEM;
filp->private_data = info;
}
if (filp->f_pos == EXT3_HTREE_EOF)
if (filp->f_pos == ext3_get_htree_eof(filp))
return 0; /* EOF */
/* Some one has messed with f_pos; reset the world */
@ -440,8 +505,8 @@ static int ext3_dx_readdir(struct file * filp,
free_rb_tree_fname(&info->root);
info->curr_node = NULL;
info->extra_fname = NULL;
info->curr_hash = pos2maj_hash(filp->f_pos);
info->curr_minor_hash = pos2min_hash(filp->f_pos);
info->curr_hash = pos2maj_hash(filp, filp->f_pos);
info->curr_minor_hash = pos2min_hash(filp, filp->f_pos);
}
/*
@ -473,7 +538,7 @@ static int ext3_dx_readdir(struct file * filp,
if (ret < 0)
return ret;
if (ret == 0) {
filp->f_pos = EXT3_HTREE_EOF;
filp->f_pos = ext3_get_htree_eof(filp);
break;
}
info->curr_node = rb_first(&info->root);
@ -493,7 +558,7 @@ static int ext3_dx_readdir(struct file * filp,
info->curr_minor_hash = fname->minor_hash;
} else {
if (info->next_hash == ~0) {
filp->f_pos = EXT3_HTREE_EOF;
filp->f_pos = ext3_get_htree_eof(filp);
break;
}
info->curr_hash = info->next_hash;
@ -512,3 +577,15 @@ static int ext3_release_dir (struct inode * inode, struct file * filp)
return 0;
}
const struct file_operations ext3_dir_operations = {
.llseek = ext3_dir_llseek,
.read = generic_read_dir,
.readdir = ext3_readdir,
.unlocked_ioctl = ext3_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext3_compat_ioctl,
#endif
.fsync = ext3_sync_file,
.release = ext3_release_dir,
};

6
fs/ext3/ext3.h
View File

@ -920,7 +920,11 @@ struct dx_hash_info
u32 *seed;
};
#define EXT3_HTREE_EOF 0x7fffffff
/* 32 and 64 bit signed EOF for dx directories */
#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
/*
* Control parameters used by ext3_htree_next_block

4
fs/ext3/hash.c
View File

@ -198,8 +198,8 @@ int ext3fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo)
return -1;
}
hash = hash & ~1;
if (hash == (EXT3_HTREE_EOF << 1))
hash = (EXT3_HTREE_EOF-1) << 1;
if (hash == (EXT3_HTREE_EOF_32BIT << 1))
hash = (EXT3_HTREE_EOF_32BIT - 1) << 1;
hinfo->hash = hash;
hinfo->minor_hash = minor_hash;
return 0;

20
fs/ext3/ialloc.c
View File

@ -180,8 +180,7 @@ error_return:
* It's OK to put directory into a group unless
* it has too many directories already (max_dirs) or
* it has too few free inodes left (min_inodes) or
* it has too few free blocks left (min_blocks) or
* it's already running too large debt (max_debt).
* it has too few free blocks left (min_blocks).
* Parent's group is preferred, if it doesn't satisfy these
* conditions we search cyclically through the rest. If none
* of the groups look good we just look for a group with more
@ -191,21 +190,16 @@ error_return:
* when we allocate an inode, within 0--255.
*/
#define INODE_COST 64
#define BLOCK_COST 256
static int find_group_orlov(struct super_block *sb, struct inode *parent)
{
int parent_group = EXT3_I(parent)->i_block_group;
struct ext3_sb_info *sbi = EXT3_SB(sb);
struct ext3_super_block *es = sbi->s_es;
int ngroups = sbi->s_groups_count;
int inodes_per_group = EXT3_INODES_PER_GROUP(sb);
unsigned int freei, avefreei;
ext3_fsblk_t freeb, avefreeb;
ext3_fsblk_t blocks_per_dir;
unsigned int ndirs;
int max_debt, max_dirs, min_inodes;
int max_dirs, min_inodes;
ext3_grpblk_t min_blocks;
int group = -1, i;
struct ext3_group_desc *desc;
@ -242,20 +236,10 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
goto fallback;
}
blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;
max_dirs = ndirs / ngroups + inodes_per_group / 16;
min_inodes = avefreei - inodes_per_group / 4;
min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;
max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext3_fsblk_t)BLOCK_COST);
if (max_debt * INODE_COST > inodes_per_group)
max_debt = inodes_per_group / INODE_COST;
if (max_debt > 255)
max_debt = 255;
if (max_debt == 0)
max_debt = 1;
for (i = 0; i < ngroups; i++) {
group = (parent_group + i) % ngroups;
desc = ext3_get_group_desc (sb, group, NULL);

6
fs/ext3/super.c
View File

@ -3015,7 +3015,6 @@ static ssize_t ext3_quota_write(struct super_block *sb, int type,
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
bh = ext3_bread(handle, inode, blk, 1, &err);
if (!bh)
goto out;
@ -3039,10 +3038,8 @@ static ssize_t ext3_quota_write(struct super_block *sb, int type,
}
brelse(bh);
out:
if (err) {
mutex_unlock(&inode->i_mutex);
if (err)
return err;
}
if (inode->i_size < off + len) {
i_size_write(inode, off + len);
EXT3_I(inode)->i_disksize = inode->i_size;
@ -3050,7 +3047,6 @@ out:
inode->i_version++;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
ext3_mark_inode_dirty(handle, inode);
mutex_unlock(&inode->i_mutex);
return len;
}

6
fs/ext4/super.c
View File

@ -4758,7 +4758,6 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
return -EIO;
}
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
bh = ext4_bread(handle, inode, blk, 1, &err);
if (!bh)
goto out;
@ -4774,16 +4773,13 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
err = ext4_handle_dirty_metadata(handle, NULL, bh);
brelse(bh);
out:
if (err) {
mutex_unlock(&inode->i_mutex);
if (err)
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;
}

23
fs/jbd/checkpoint.c
View File

@ -508,20 +508,19 @@ int cleanup_journal_tail(journal_t *journal)
/*
* We need to make sure that any blocks that were recently written out
* --- perhaps by log_do_checkpoint() --- are flushed out before we
* drop the transactions from the journal. It's unlikely this will be
* necessary, especially with an appropriately sized journal, but we
* need this to guarantee correctness. Fortunately
* cleanup_journal_tail() doesn't get called all that often.
* drop the transactions from the journal. Similarly we need to be sure
* superblock makes it to disk before next transaction starts reusing
* freed space (otherwise we could replay some blocks of the new
* transaction thinking they belong to the old one). So we use
* WRITE_FLUSH_FUA. It's unlikely this will be necessary, especially
* with an appropriately sized journal, but we need this to guarantee
* correctness. Fortunately cleanup_journal_tail() doesn't get called
* all that often.
*/
if (journal->j_flags & JFS_BARRIER)
blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL);
journal_update_sb_log_tail(journal, first_tid, blocknr,
WRITE_FLUSH_FUA);
spin_lock(&journal->j_state_lock);
if (!tid_gt(first_tid, journal->j_tail_sequence)) {
spin_unlock(&journal->j_state_lock);
/* Someone else cleaned up journal so return 0 */
return 0;
}
/* OK, update the superblock to recover the freed space.
* Physical blocks come first: have we wrapped beyond the end of
* the log? */
@ -539,8 +538,6 @@ int cleanup_journal_tail(journal_t *journal)
journal->j_tail_sequence = first_tid;
journal->j_tail = blocknr;
spin_unlock(&journal->j_state_lock);
if (!(journal->j_flags & JFS_ABORT))
journal_update_superblock(journal, 1);
return 0;
}

21
fs/jbd/commit.c
View File

@ -298,6 +298,7 @@ void journal_commit_transaction(journal_t *journal)
int tag_flag;
int i;
struct blk_plug plug;
int write_op = WRITE;
/*
* First job: lock down the current transaction and wait for
@ -307,7 +308,16 @@ void journal_commit_transaction(journal_t *journal)
/* Do we need to erase the effects of a prior journal_flush? */
if (journal->j_flags & JFS_FLUSHED) {
jbd_debug(3, "super block updated\n");
journal_update_superblock(journal, 1);
mutex_lock(&journal->j_checkpoint_mutex);
/*
* We hold j_checkpoint_mutex so tail cannot change under us.
* We don't need any special data guarantees for writing sb
* since journal is empty and it is ok for write to be
* flushed only with transaction commit.
*/
journal_update_sb_log_tail(journal, journal->j_tail_sequence,
journal->j_tail, WRITE_SYNC);
mutex_unlock(&journal->j_checkpoint_mutex);
} else {
jbd_debug(3, "superblock not updated\n");
}
@ -413,13 +423,16 @@ void journal_commit_transaction(journal_t *journal)
jbd_debug (3, "JBD: commit phase 2\n");
if (tid_geq(journal->j_commit_waited, commit_transaction->t_tid))
write_op = WRITE_SYNC;
/*
* Now start flushing things to disk, in the order they appear
* on the transaction lists. Data blocks go first.
*/
blk_start_plug(&plug);
err = journal_submit_data_buffers(journal, commit_transaction,
WRITE_SYNC);
write_op);
blk_finish_plug(&plug);
/*
@ -478,7 +491,7 @@ void journal_commit_transaction(journal_t *journal)
blk_start_plug(&plug);
journal_write_revoke_records(journal, commit_transaction, WRITE_SYNC);
journal_write_revoke_records(journal, commit_transaction, write_op);
/*
* If we found any dirty or locked buffers, then we should have
@ -649,7 +662,7 @@ start_journal_io:
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
bh->b_end_io = journal_end_buffer_io_sync;
submit_bh(WRITE_SYNC, bh);
submit_bh(write_op, bh);
}
cond_resched();

208
fs/jbd/journal.c
View File

@ -563,6 +563,8 @@ int log_wait_commit(journal_t *journal, tid_t tid)
spin_unlock(&journal->j_state_lock);
#endif
spin_lock(&journal->j_state_lock);
if (!tid_geq(journal->j_commit_waited, tid))
journal->j_commit_waited = tid;
while (tid_gt(tid, journal->j_commit_sequence)) {
jbd_debug(1, "JBD: want %d, j_commit_sequence=%d\n",
tid, journal->j_commit_sequence);
@ -921,8 +923,33 @@ static int journal_reset(journal_t *journal)
journal->j_max_transaction_buffers = journal->j_maxlen / 4;
/* Add the dynamic fields and write it to disk. */
journal_update_superblock(journal, 1);
/*
* As a special case, if the on-disk copy is already marked as needing
* no recovery (s_start == 0), then we can safely defer the superblock
* update until the next commit by setting JFS_FLUSHED. This avoids
* attempting a write to a potential-readonly device.
*/
if (sb->s_start == 0) {
jbd_debug(1,"JBD: Skipping superblock update on recovered sb "
"(start %u, seq %d, errno %d)\n",
journal->j_tail, journal->j_tail_sequence,
journal->j_errno);
journal->j_flags |= JFS_FLUSHED;
} else {
/* Lock here to make assertions happy... */
mutex_lock(&journal->j_checkpoint_mutex);
/*
* Update log tail information. We use WRITE_FUA since new
* transaction will start reusing journal space and so we
* must make sure information about current log tail is on
* disk before that.
*/
journal_update_sb_log_tail(journal,
journal->j_tail_sequence,
journal->j_tail,
WRITE_FUA);
mutex_unlock(&journal->j_checkpoint_mutex);
}
return journal_start_thread(journal);
}
@ -999,35 +1026,15 @@ int journal_create(journal_t *journal)
return journal_reset(journal);
}
/**
* void journal_update_superblock() - Update journal sb on disk.
* @journal: The journal to update.
* @wait: Set to '0' if you don't want to wait for IO completion.
*
* Update a journal's dynamic superblock fields and write it to disk,
* optionally waiting for the IO to complete.
*/
void journal_update_superblock(journal_t *journal, int wait)
static void journal_write_superblock(journal_t *journal, int write_op)
{
journal_superblock_t *sb = journal->j_superblock;
struct buffer_head *bh = journal->j_sb_buffer;
int ret;
/*
* As a special case, if the on-disk copy is already marked as needing
* no recovery (s_start == 0) and there are no outstanding transactions
* in the filesystem, then we can safely defer the superblock update
* until the next commit by setting JFS_FLUSHED. This avoids
* attempting a write to a potential-readonly device.
*/
if (sb->s_start == 0 && journal->j_tail_sequence ==
journal->j_transaction_sequence) {
jbd_debug(1,"JBD: Skipping superblock update on recovered sb "
"(start %u, seq %d, errno %d)\n",
journal->j_tail, journal->j_tail_sequence,
journal->j_errno);
goto out;
}
trace_journal_write_superblock(journal, write_op);
if (!(journal->j_flags & JFS_BARRIER))
write_op &= ~(REQ_FUA | REQ_FLUSH);
lock_buffer(bh);
if (buffer_write_io_error(bh)) {
char b[BDEVNAME_SIZE];
/*
@ -1045,44 +1052,102 @@ void journal_update_superblock(journal_t *journal, int wait)
set_buffer_uptodate(bh);
}
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
ret = submit_bh(write_op, bh);
wait_on_buffer(bh);
if (buffer_write_io_error(bh)) {
clear_buffer_write_io_error(bh);
set_buffer_uptodate(bh);
ret = -EIO;
}
if (ret) {
char b[BDEVNAME_SIZE];
printk(KERN_ERR "JBD: Error %d detected "
"when updating journal superblock for %s.\n",
ret, journal_dev_name(journal, b));
}
}
/**
* journal_update_sb_log_tail() - Update log tail in journal sb on disk.
* @journal: The journal to update.
* @tail_tid: TID of the new transaction at the tail of the log
* @tail_block: The first block of the transaction at the tail of the log
* @write_op: With which operation should we write the journal sb
*
* Update a journal's superblock information about log tail and write it to
* disk, waiting for the IO to complete.
*/
void journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid,
unsigned int tail_block, int write_op)
{
journal_superblock_t *sb = journal->j_superblock;
BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex));
jbd_debug(1,"JBD: updating superblock (start %u, seq %u)\n",
tail_block, tail_tid);
sb->s_sequence = cpu_to_be32(tail_tid);
sb->s_start = cpu_to_be32(tail_block);
journal_write_superblock(journal, write_op);
/* Log is no longer empty */
spin_lock(&journal->j_state_lock);
jbd_debug(1,"JBD: updating superblock (start %u, seq %d, errno %d)\n",
journal->j_tail, journal->j_tail_sequence, journal->j_errno);
WARN_ON(!sb->s_sequence);
journal->j_flags &= ~JFS_FLUSHED;
spin_unlock(&journal->j_state_lock);
}
/**
* mark_journal_empty() - Mark on disk journal as empty.
* @journal: The journal to update.
*
* Update a journal's dynamic superblock fields to show that journal is empty.
* Write updated superblock to disk waiting for IO to complete.
*/
static void mark_journal_empty(journal_t *journal)
{
journal_superblock_t *sb = journal->j_superblock;
BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex));
spin_lock(&journal->j_state_lock);
jbd_debug(1, "JBD: Marking journal as empty (seq %d)\n",
journal->j_tail_sequence);
sb->s_sequence = cpu_to_be32(journal->j_tail_sequence);
sb->s_start = cpu_to_be32(journal->j_tail);
sb->s_errno = cpu_to_be32(journal->j_errno);
sb->s_start = cpu_to_be32(0);
spin_unlock(&journal->j_state_lock);
BUFFER_TRACE(bh, "marking dirty");
mark_buffer_dirty(bh);
if (wait) {
sync_dirty_buffer(bh);
if (buffer_write_io_error(bh)) {
char b[BDEVNAME_SIZE];
printk(KERN_ERR "JBD: I/O error detected "
"when updating journal superblock for %s.\n",
journal_dev_name(journal, b));
clear_buffer_write_io_error(bh);
set_buffer_uptodate(bh);
}
} else
write_dirty_buffer(bh, WRITE);
trace_jbd_update_superblock_end(journal, wait);
out:
/* If we have just flushed the log (by marking s_start==0), then
* any future commit will have to be careful to update the
* superblock again to re-record the true start of the log. */
journal_write_superblock(journal, WRITE_FUA);
spin_lock(&journal->j_state_lock);
if (sb->s_start)
journal->j_flags &= ~JFS_FLUSHED;
else
journal->j_flags |= JFS_FLUSHED;
/* Log is empty */
journal->j_flags |= JFS_FLUSHED;
spin_unlock(&journal->j_state_lock);
}
/**
* journal_update_sb_errno() - Update error in the journal.
* @journal: The journal to update.
*
* Update a journal's errno. Write updated superblock to disk waiting for IO
* to complete.
*/
static void journal_update_sb_errno(journal_t *journal)
{
journal_superblock_t *sb = journal->j_superblock;
spin_lock(&journal->j_state_lock);
jbd_debug(1, "JBD: updating superblock error (errno %d)\n",
journal->j_errno);
sb->s_errno = cpu_to_be32(journal->j_errno);
spin_unlock(&journal->j_state_lock);
journal_write_superblock(journal, WRITE_SYNC);
}
/*
* Read the superblock for a given journal, performing initial
* validation of the format.
@ -1251,6 +1316,8 @@ int journal_destroy(journal_t *journal)
/* Force any old transactions to disk */
/* We cannot race with anybody but must keep assertions happy */
mutex_lock(&journal->j_checkpoint_mutex);
/* Totally anal locking here... */
spin_lock(&journal->j_list_lock);
while (journal->j_checkpoint_transactions != NULL) {
@ -1266,16 +1333,14 @@ int journal_destroy(journal_t *journal)
if (journal->j_sb_buffer) {
if (!is_journal_aborted(journal)) {
/* We can now mark the journal as empty. */
journal->j_tail = 0;
journal->j_tail_sequence =
++journal->j_transaction_sequence;
journal_update_superblock(journal, 1);
} else {
mark_journal_empty(journal);
} else
err = -EIO;
}
brelse(journal->j_sb_buffer);
}
mutex_unlock(&journal->j_checkpoint_mutex);
if (journal->j_inode)
iput(journal->j_inode);
@ -1455,7 +1520,6 @@ int journal_flush(journal_t *journal)
{
int err = 0;
transaction_t *transaction = NULL;
unsigned int old_tail;
spin_lock(&journal->j_state_lock);
@ -1490,6 +1554,7 @@ int journal_flush(journal_t *journal)
if (is_journal_aborted(journal))
return -EIO;
mutex_lock(&journal->j_checkpoint_mutex);
cleanup_journal_tail(journal);
/* Finally, mark the journal as really needing no recovery.
@ -1497,14 +1562,9 @@ int journal_flush(journal_t *journal)
* the magic code for a fully-recovered superblock. Any future
* commits of data to the journal will restore the current
* s_start value. */
mark_journal_empty(journal);
mutex_unlock(&journal->j_checkpoint_mutex);
spin_lock(&journal->j_state_lock);
old_tail = journal->j_tail;
journal->j_tail = 0;
spin_unlock(&journal->j_state_lock);
journal_update_superblock(journal, 1);
spin_lock(&journal->j_state_lock);
journal->j_tail = old_tail;
J_ASSERT(!journal->j_running_transaction);
J_ASSERT(!journal->j_committing_transaction);
J_ASSERT(!journal->j_checkpoint_transactions);
@ -1544,8 +1604,12 @@ int journal_wipe(journal_t *journal, int write)
write ? "Clearing" : "Ignoring");
err = journal_skip_recovery(journal);
if (write)
journal_update_superblock(journal, 1);
if (write) {
/* Lock to make assertions happy... */
mutex_lock(&journal->j_checkpoint_mutex);
mark_journal_empty(journal);
mutex_unlock(&journal->j_checkpoint_mutex);
}
no_recovery:
return err;
@ -1613,7 +1677,7 @@ static void __journal_abort_soft (journal_t *journal, int errno)
__journal_abort_hard(journal);
if (errno)
journal_update_superblock(journal, 1);
journal_update_sb_errno(journal);
}
/**

2
fs/jbd/transaction.c
View File

@ -1433,8 +1433,6 @@ int journal_stop(handle_t *handle)
}
}
if (handle->h_sync)
transaction->t_synchronous_commit = 1;
current->journal_info = NULL;
spin_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);

32
fs/quota/dquot.c
View File

@ -116,15 +116,15 @@
* spinlock to internal buffers before writing.
*
* Lock ordering (including related VFS locks) is the following:
* i_mutex > dqonoff_sem > journal_lock > dqptr_sem > dquot->dq_lock >
* dqonoff_mutex > i_mutex > journal_lock > dqptr_sem > dquot->dq_lock >
* dqio_mutex
* dqonoff_mutex > i_mutex comes from dquot_quota_sync, dquot_enable, etc.
* The lock ordering of dqptr_sem imposed by quota code is only dqonoff_sem >
* dqptr_sem. But filesystem has to count with the fact that functions such as
* dquot_alloc_space() acquire dqptr_sem and they usually have to be called
* from inside a transaction to keep filesystem consistency after a crash. Also
* filesystems usually want to do some IO on dquot from ->mark_dirty which is
* called with dqptr_sem held.
* i_mutex on quota files is special (it's below dqio_mutex)
*/
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(dq_list_lock);
@ -638,7 +638,7 @@ int dquot_quota_sync(struct super_block *sb, int type, int wait)
dqstats_inc(DQST_SYNCS);
mutex_unlock(&dqopt->dqonoff_mutex);
if (!wait || (sb_dqopt(sb)->flags & DQUOT_QUOTA_SYS_FILE))
if (!wait || (dqopt->flags & DQUOT_QUOTA_SYS_FILE))
return 0;
/* This is not very clever (and fast) but currently I don't know about
@ -652,18 +652,17 @@ int dquot_quota_sync(struct super_block *sb, int type, int wait)
* Now when everything is written we can discard the pagecache so
* that userspace sees the changes.
*/
mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
mutex_lock(&dqopt->dqonoff_mutex);
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_active(sb, cnt))
continue;
mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex,
I_MUTEX_QUOTA);
truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0);
mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex);
mutex_lock(&dqopt->files[cnt]->i_mutex);
truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
mutex_unlock(&dqopt->files[cnt]->i_mutex);
}
mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
mutex_unlock(&dqopt->dqonoff_mutex);
return 0;
}
@ -907,14 +906,14 @@ static void add_dquot_ref(struct super_block *sb, int type)
spin_unlock(&inode->i_lock);
continue;
}
#ifdef CONFIG_QUOTA_DEBUG
if (unlikely(inode_get_rsv_space(inode) > 0))
reserved = 1;
#endif
__iget(inode);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_sb_list_lock);
#ifdef CONFIG_QUOTA_DEBUG
if (unlikely(inode_get_rsv_space(inode) > 0))
reserved = 1;
#endif
iput(old_inode);
__dquot_initialize(inode, type);
@ -2037,8 +2036,7 @@ int dquot_disable(struct super_block *sb, int type, unsigned int flags)
/* If quota was reenabled in the meantime, we have
* nothing to do */
if (!sb_has_quota_loaded(sb, cnt)) {
mutex_lock_nested(&toputinode[cnt]->i_mutex,
I_MUTEX_QUOTA);
mutex_lock(&toputinode[cnt]->i_mutex);
toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
S_NOATIME | S_NOQUOTA);
truncate_inode_pages(&toputinode[cnt]->i_data,
@ -2133,7 +2131,7 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
/* We don't want quota and atime on quota files (deadlocks
* possible) Also nobody should write to the file - we use
* special IO operations which ignore the immutable bit. */
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
mutex_lock(&inode->i_mutex);
oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE |
S_NOQUOTA);
inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
@ -2180,7 +2178,7 @@ out_file_init:
iput(inode);
out_lock:
if (oldflags != -1) {
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
mutex_lock(&inode->i_mutex);
/* Set the flags back (in the case of accidental quotaon()
* on a wrong file we don't want to mess up the flags) */
inode->i_flags &= ~(S_NOATIME | S_NOQUOTA | S_IMMUTABLE);

6
fs/reiserfs/super.c
View File

@ -2270,7 +2270,6 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
while (towrite > 0) {
tocopy = sb->s_blocksize - offset < towrite ?
sb->s_blocksize - offset : towrite;
@ -2302,16 +2301,13 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
blk++;
}
out:
if (len == towrite) {
mutex_unlock(&inode->i_mutex);
if (len == towrite)
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;
}

18
include/linux/jbd.h
View File

@ -479,12 +479,6 @@ struct transaction_s
* How many handles used this transaction? [t_handle_lock]
*/
int t_handle_count;
/*
* This transaction is being forced and some process is
* waiting for it to finish.
*/
unsigned int t_synchronous_commit:1;
};
/**
@ -531,6 +525,8 @@ struct transaction_s
* transaction
* @j_commit_request: Sequence number of the most recent transaction wanting
* commit
* @j_commit_waited: Sequence number of the most recent transaction someone
* is waiting for to commit.
* @j_uuid: Uuid of client object.
* @j_task: Pointer to the current commit thread for this journal
* @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a
@ -695,6 +691,13 @@ struct journal_s
*/
tid_t j_commit_request;
/*
* Sequence number of the most recent transaction someone is waiting
* for to commit.
* [j_state_lock]
*/
tid_t j_commit_waited;
/*
* Journal uuid: identifies the object (filesystem, LVM volume etc)
* backed by this journal. This will eventually be replaced by an array
@ -861,7 +864,8 @@ extern int journal_destroy (journal_t *);
extern int journal_recover (journal_t *journal);
extern int journal_wipe (journal_t *, int);
extern int journal_skip_recovery (journal_t *);
extern void journal_update_superblock (journal_t *, int);
extern void journal_update_sb_log_tail (journal_t *, tid_t, unsigned int,
int);
extern void journal_abort (journal_t *, int);
extern int journal_errno (journal_t *);
extern void journal_ack_err (journal_t *);

39
include/trace/events/jbd.h
View File

@ -36,19 +36,17 @@ DECLARE_EVENT_CLASS(jbd_commit,
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
TP_printk("dev %d,%d transaction %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
__entry->transaction)
);
DEFINE_EVENT(jbd_commit, jbd_start_commit,
@ -87,19 +85,17 @@ TRACE_EVENT(jbd_drop_transaction,
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
TP_printk("dev %d,%d transaction %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
__entry->transaction)
);
TRACE_EVENT(jbd_end_commit,
@ -109,21 +105,19 @@ TRACE_EVENT(jbd_end_commit,
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
__field( int, head )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
__entry->head = journal->j_tail_sequence;
),
TP_printk("dev %d,%d transaction %d sync %d head %d",
TP_printk("dev %d,%d transaction %d head %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit, __entry->head)
__entry->transaction, __entry->head)
);
TRACE_EVENT(jbd_do_submit_data,
@ -133,19 +127,17 @@ TRACE_EVENT(jbd_do_submit_data,
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
TP_printk("dev %d,%d transaction %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
__entry->transaction)
);
TRACE_EVENT(jbd_cleanup_journal_tail,
@ -177,24 +169,23 @@ TRACE_EVENT(jbd_cleanup_journal_tail,
__entry->block_nr, __entry->freed)
);
TRACE_EVENT(jbd_update_superblock_end,
TP_PROTO(journal_t *journal, int wait),
TRACE_EVENT(journal_write_superblock,
TP_PROTO(journal_t *journal, int write_op),
TP_ARGS(journal, wait),
TP_ARGS(journal, write_op),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, wait )
__field( int, write_op )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->wait = wait;
__entry->write_op = write_op;
),
TP_printk("dev %d,%d wait %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->wait)
TP_printk("dev %d,%d write_op %x", MAJOR(__entry->dev),
MINOR(__entry->dev), __entry->write_op)
);
#endif /* _TRACE_JBD_H */