Commit f3054e53 authored by Baokun Li's avatar Baokun Li Committed by Theodore Ts'o
Browse files

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: default avatarBaokun Li <libaokun1@huawei.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarZhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20250122114130.229709-3-libaokun@huaweicloud.com


Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 99708f8a

fs/ext4/ext4.h

+6 −0
Original line number Diff line number Diff line
@@ -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

 */