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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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2
fs/ext4/fsync.c
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@@ -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;
}