From: Baokun Li Date: Wed, 22 Jan 2025 11:41:25 +0000 (+0800) Subject: ext4: add EXT4_FLAGS_EMERGENCY_RO bit X-Git-Tag: v6.15-rc1~145^2~38 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f3054e53c2f367bd3cf6535afe9ab13198d2d739;p=thirdparty%2Fkernel%2Flinux.git ext4: add EXT4_FLAGS_EMERGENCY_RO bit 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 Reviewed-by: Jan Kara Reviewed-by: Zhang Yi Link: https://patch.msgid.link/20250122114130.229709-3-libaokun@huaweicloud.com Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 8f6bfa25fa6f9..81cb16b5f8dac 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2239,6 +2239,7 @@ 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) @@ -2246,6 +2247,11 @@ 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 */