6.14-stable review patch. If anyone has any objections, please let me know.
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From: Baokun Li libaokun1@huawei.com
[ Upstream commit f3054e53c2f367bd3cf6535afe9ab13198d2d739 ]
EXT4_FLAGS_EMERGENCY_RO Indicates that the current file system has become read-only due to some error. Compared to SB_RDONLY, setting it does not require a lock because we won't clear it, which avoids over-coupling with vfs freeze. Also, add a helper function ext4_emergency_ro() to check if the bit is set.
Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Reviewed-by: Zhang Yi yi.zhang@huawei.com Link: https://patch.msgid.link/20250122114130.229709-3-libaokun@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu Stable-dep-of: 8f984530c242 ("ext4: correct behavior under errors=remount-ro mode") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/ext4.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b3528e4eba180..7f5fd1a433662 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2236,6 +2236,7 @@ enum { EXT4_FLAGS_RESIZING, /* Avoid superblock update and resize race */ EXT4_FLAGS_SHUTDOWN, /* Prevent access to the file system */ EXT4_FLAGS_BDEV_IS_DAX, /* Current block device support DAX */ + EXT4_FLAGS_EMERGENCY_RO,/* Emergency read-only due to fs errors */ };
static inline int ext4_forced_shutdown(struct super_block *sb) @@ -2243,6 +2244,11 @@ static inline int ext4_forced_shutdown(struct super_block *sb) return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags); }
+static inline int ext4_emergency_ro(struct super_block *sb) +{ + return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags); +} + /* * Default values for user and/or group using reserved blocks */