luck/tmp_suning_uos_patched
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fs/sysv: stop using write_super and s_dirt

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It does not look like sysv FS needs 'write_super()' at all, because all it
does is a timestamp update. I cannot test this patch, because this
file-system is so old and probably has not been used by anyone for years,
so there are no tools to create it in Linux. But from the code I see that
marking the superblock as dirty is basically marking the superblock buffers as
drity and then setting the s_dirt flag. And when 'write_super()' is executed to
handle the s_dirt flag, we just update the timestamp and again mark the
superblock buffer as dirty. Seems pointless.

It looks like we can update the timestamp more opprtunistically - on unmount
or remount of sync, and nothing should change.

Thus, this patch removes 'sysv_write_super()' and 's_dirt'.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Artem Bityutskiy 2012-07-03 16:43:28 +03:00 committed by Al Viro
parent eee458936b
commit 9d46be294d
2 changed files with 0 additions and 11 deletions
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10
fs/sysv/inode.c
View File

@ -43,7 +43,6 @@ static int sysv_sync_fs(struct super_block *sb, int wait)
* then attach current time stamp.
* But if the filesystem was marked clean, keep it clean.
*/
sb->s_dirt = 0;
old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
if (sbi->s_type == FSTYPE_SYSV4) {
if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
@ -57,14 +56,6 @@ static int sysv_sync_fs(struct super_block *sb, int wait)
return 0;
}
static void sysv_write_super(struct super_block *sb)
{
if (!(sb->s_flags & MS_RDONLY))
sysv_sync_fs(sb, 1);
else
sb->s_dirt = 0;
}
static int sysv_remount(struct super_block *sb, int *flags, char *data)
{
struct sysv_sb_info *sbi = SYSV_SB(sb);
@ -351,7 +342,6 @@ const struct super_operations sysv_sops = {
.write_inode = sysv_write_inode,
.evict_inode = sysv_evict_inode,
.put_super = sysv_put_super,
.write_super = sysv_write_super,
.sync_fs = sysv_sync_fs,
.remount_fs = sysv_remount,
.statfs = sysv_statfs,

1
fs/sysv/sysv.h
View File

@ -117,7 +117,6 @@ static inline void dirty_sb(struct super_block *sb)
mark_buffer_dirty(sbi->s_bh1);
if (sbi->s_bh1 != sbi->s_bh2)
mark_buffer_dirty(sbi->s_bh2);
sb->s_dirt = 1;
}