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ext4: make s_mount_flags modifications atomic

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Fast commit file system states are recorded in
sbi->s_mount_flags. Fast commit expects these bit manipulations to be
atomic. This patch adds helpers to make those modifications atomic.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201106035911.1942128-21-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2020-11-05 19:59:09 -08:00 committed by Theodore Ts'o
parent da0c5d2695
commit 9b5f6c9b83
7 changed files with 52 additions and 34 deletions
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40
fs/ext4/ext4.h
View file

@ -1419,16 +1419,6 @@ struct ext4_super_block {
#ifdef __KERNEL__
/*
* run-time mount flags
*/
#define EXT4_MF_MNTDIR_SAMPLED 0x0001
#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
#define EXT4_MF_FC_INELIGIBLE 0x0004 /* Fast commit ineligible */
#define EXT4_MF_FC_COMMITTING 0x0008 /* File system underoing a fast
* commit.
*/
#ifdef CONFIG_FS_ENCRYPTION
#define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
#else
@ -1463,7 +1453,7 @@ struct ext4_sb_info {
struct buffer_head * __rcu *s_group_desc;
unsigned int s_mount_opt;
unsigned int s_mount_opt2;
unsigned int s_mount_flags;
unsigned long s_mount_flags;
unsigned int s_def_mount_opt;
ext4_fsblk_t s_sb_block;
atomic64_t s_resv_clusters;
@ -1691,6 +1681,34 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
_v; \
})
/*
* run-time mount flags
*/
enum {
EXT4_MF_MNTDIR_SAMPLED,
EXT4_MF_FS_ABORTED, /* Fatal error detected */
EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
EXT4_MF_FC_COMMITTING /* File system underoing a fast
* commit.
*/
};
static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
{
set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
}
static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
{
clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
}
static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
{
return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
}
/*
* Simulate_fail codes
*/

18
fs/ext4/fast_commit.c
View file

@ -261,7 +261,7 @@ void ext4_fc_mark_ineligible(struct super_block *sb, int reason)
(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
return;
sbi->s_mount_flags |= EXT4_MF_FC_INELIGIBLE;
ext4_set_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
WARN_ON(reason >= EXT4_FC_REASON_MAX);
sbi->s_fc_stats.fc_ineligible_reason_count[reason]++;
}
@ -294,14 +294,14 @@ void ext4_fc_stop_ineligible(struct super_block *sb)
(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
return;
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FC_INELIGIBLE;
ext4_set_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
atomic_dec(&EXT4_SB(sb)->s_fc_ineligible_updates);
}
static inline int ext4_fc_is_ineligible(struct super_block *sb)
{
return (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FC_INELIGIBLE) ||
atomic_read(&EXT4_SB(sb)->s_fc_ineligible_updates);
return (ext4_test_mount_flag(sb, EXT4_MF_FC_INELIGIBLE) ||
atomic_read(&EXT4_SB(sb)->s_fc_ineligible_updates));
}
/*
@ -349,7 +349,7 @@ static int ext4_fc_track_template(
spin_lock(&sbi->s_fc_lock);
if (list_empty(&EXT4_I(inode)->i_fc_list))
list_add_tail(&EXT4_I(inode)->i_fc_list,
(sbi->s_mount_flags & EXT4_MF_FC_COMMITTING) ?
(ext4_test_mount_flag(inode->i_sb, EXT4_MF_FC_COMMITTING)) ?
&sbi->s_fc_q[FC_Q_STAGING] :
&sbi->s_fc_q[FC_Q_MAIN]);
spin_unlock(&sbi->s_fc_lock);
@ -402,7 +402,7 @@ static int __track_dentry_update(struct inode *inode, void *arg, bool update)
node->fcd_name.len = dentry->d_name.len;
spin_lock(&sbi->s_fc_lock);
if (sbi->s_mount_flags & EXT4_MF_FC_COMMITTING)
if (ext4_test_mount_flag(inode->i_sb, EXT4_MF_FC_COMMITTING))
list_add_tail(&node->fcd_list,
&sbi->s_fc_dentry_q[FC_Q_STAGING]);
else
@ -857,7 +857,7 @@ static int ext4_fc_submit_inode_data_all(journal_t *journal)
int ret = 0;
spin_lock(&sbi->s_fc_lock);
sbi->s_mount_flags |= EXT4_MF_FC_COMMITTING;
ext4_set_mount_flag(sb, EXT4_MF_FC_COMMITTING);
list_for_each(pos, &sbi->s_fc_q[FC_Q_MAIN]) {
ei = list_entry(pos, struct ext4_inode_info, i_fc_list);
ext4_set_inode_state(&ei->vfs_inode, EXT4_STATE_FC_COMMITTING);
@ -1206,8 +1206,8 @@ static void ext4_fc_cleanup(journal_t *journal, int full)
list_splice_init(&sbi->s_fc_q[FC_Q_STAGING],
&sbi->s_fc_q[FC_Q_STAGING]);
sbi->s_mount_flags &= ~EXT4_MF_FC_COMMITTING;
sbi->s_mount_flags &= ~EXT4_MF_FC_INELIGIBLE;
ext4_clear_mount_flag(sb, EXT4_MF_FC_COMMITTING);
ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
if (full)
sbi->s_fc_bytes = 0;

4
fs/ext4/file.c
View file

@ -780,13 +780,13 @@ static int ext4_sample_last_mounted(struct super_block *sb,
handle_t *handle;
int err;
if (likely(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED))
if (likely(ext4_test_mount_flag(sb, EXT4_MF_MNTDIR_SAMPLED)))
return 0;
if (sb_rdonly(sb) || !sb_start_intwrite_trylock(sb))
return 0;
sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
ext4_set_mount_flag(sb, EXT4_MF_MNTDIR_SAMPLED);
/*
* Sample where the filesystem has been mounted and
* store it in the superblock for sysadmin convenience

2
fs/ext4/fsync.c
View file

@ -143,7 +143,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
if (sb_rdonly(inode->i_sb)) {
/* Make sure that we read updated s_mount_flags value */
smp_rmb();
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
if (ext4_test_mount_flag(inode->i_sb, EXT4_MF_FS_ABORTED))
ret = -EROFS;
goto out;
}

4
fs/ext4/inode.c
View file

@ -2442,7 +2442,7 @@ static int mpage_map_and_submit_extent(handle_t *handle,
struct super_block *sb = inode->i_sb;
if (ext4_forced_shutdown(EXT4_SB(sb)) ||
EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
goto invalidate_dirty_pages;
/*
* Let the uper layers retry transient errors.
@ -2676,7 +2676,7 @@ static int ext4_writepages(struct address_space *mapping,
* the stack trace.
*/
if (unlikely(ext4_forced_shutdown(EXT4_SB(mapping->host->i_sb)) ||
sbi->s_mount_flags & EXT4_MF_FS_ABORTED)) {
ext4_test_mount_flag(inode->i_sb, EXT4_MF_FS_ABORTED))) {
ret = -EROFS;
goto out_writepages;
}

4
fs/ext4/mballoc.c
View file

@ -4477,7 +4477,7 @@ static inline void ext4_mb_show_pa(struct super_block *sb)
{
ext4_group_t i, ngroups;
if (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
return;
ngroups = ext4_get_groups_count(sb);
@ -4508,7 +4508,7 @@ static void ext4_mb_show_ac(struct ext4_allocation_context *ac)
{
struct super_block *sb = ac->ac_sb;
if (EXT4_SB(sb)->s_mount_flags & EXT4_MF_FS_ABORTED)
if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
return;
mb_debug(sb, "Can't allocate:"

14
fs/ext4/super.c
View file

@ -686,7 +686,7 @@ static void ext4_handle_error(struct super_block *sb)
if (!test_opt(sb, ERRORS_CONT)) {
journal_t *journal = EXT4_SB(sb)->s_journal;
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
if (journal)
jbd2_journal_abort(journal, -EIO);
}
@ -904,7 +904,7 @@ void __ext4_abort(struct super_block *sb, const char *function,
va_end(args);
if (sb_rdonly(sb) == 0) {
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
if (EXT4_SB(sb)->s_journal)
jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
@ -2153,7 +2153,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
return 1;
case Opt_abort:
sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
return 1;
case Opt_i_version:
sb->s_flags |= SB_I_VERSION;
@ -4778,8 +4778,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
sbi->s_fc_bytes = 0;
sbi->s_mount_flags &= ~EXT4_MF_FC_INELIGIBLE;
sbi->s_mount_flags &= ~EXT4_MF_FC_COMMITTING;
ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
ext4_clear_mount_flag(sb, EXT4_MF_FC_COMMITTING);
spin_lock_init(&sbi->s_fc_lock);
memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
sbi->s_fc_replay_state.fc_regions = NULL;
@ -5881,7 +5881,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
goto restore_opts;
}
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
@ -5895,7 +5895,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
}
if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
err = -EROFS;
goto restore_opts;
}