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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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4
fs/ext4/file.c
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@@ -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