From: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
This patch changes the '__ext4_handle_dirty_super()' function which is used
by ext4 to update the super-block via the journal in the following cases:
1. When creating the first large file on a file
system without EXT4_FEATURE_RO_COMPAT_LARGE_FILE feature.
2. When re-sizing the file-system
3. When creating an xattr on a file-system without the
EXT4_FEATURE_COMPAT_EXT_ATTR feature.
This function, however, falls back to just marking the superblock as dirty
if the file-system has no journal. But it is user really rarely and it does not
give any benefit to use the delayed superblock write (via the VFS's
'sync_supers()' kernel thread) in these cases. We can just write out the
superblock asynchronously instead.
This patch also removes 's_dirt' condition on the unmount path because we never
set it anymore, so we should not test it.
Tested using xfstests for both journalled and non-journalled ext4.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@xxxxxxxxxxxxxxx>
---
fs/ext4/ext4.h | 1 +
fs/ext4/ext4_jbd2.c | 2 +-
fs/ext4/super.c | 5 ++---
3 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 0c4042e..b2439d5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2041,6 +2041,7 @@ extern int ext4_superblock_csum_verify(struct super_block *sb,
struct ext4_super_block *es);
extern void ext4_superblock_csum_set(struct super_block *sb,
struct ext4_super_block *es);
+extern int ext4_commit_super(struct super_block *sb, int sync);
extern void *ext4_kvmalloc(size_t size, gfp_t flags);
extern void *ext4_kvzalloc(size_t size, gfp_t flags);
extern void ext4_kvfree(void *ptr);
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index 90f7c2e..27354df 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -156,6 +156,6 @@ int __ext4_handle_dirty_super(const char *where, unsigned int line,
(struct ext4_super_block *)bh->b_data);
mark_buffer_dirty(bh);
} else
- sb->s_dirt = 1;
+ err = ext4_commit_super(sb, 0);
return err;
}
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index eb7aa3e..9b26ba0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -63,7 +63,6 @@ static struct ext4_features *ext4_feat;
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
unsigned long journal_devnum);
static int ext4_show_options(struct seq_file *seq, struct dentry *root);
-static int ext4_commit_super(struct super_block *sb, int sync);
static void ext4_mark_recovery_complete(struct super_block *sb,
struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
@@ -896,7 +895,7 @@ static void ext4_put_super(struct super_block *sb)
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
es->s_state = cpu_to_le16(sbi->s_mount_state);
}
- if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
+ if (!(sb->s_flags & MS_RDONLY))
ext4_commit_super(sb, 1);
if (sbi->s_proc) {
@@ -4155,7 +4154,7 @@ static int ext4_load_journal(struct super_block *sb,
return 0;
}
-static int ext4_commit_super(struct super_block *sb, int sync)
+int ext4_commit_super(struct super_block *sb, int sync)
{
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
--
1.7.7.6
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