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ext4: add EXT4_FLAGS_EMERGENCY_RO bit

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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>
This commit is contained in:
Baokun Li 2025-01-22 19:41:25 +08:00 • committed by Theodore Ts'o
parent 99708f8a9d
commit f3054e53c2
1 changed files with 6 additions and 0 deletions
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6
fs/ext4/ext4.h
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@ -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
*/