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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2015-02-12 22:31:21 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-02-12 22:31:21 -0500 |
| commit | 2cb5cc8b09c939c77826635956c35995b15c9331 (patch) | |
| tree | a172f96f3dca8c8432786eef7d103138ef859370 /fs/ext4/ext4.h | |
| parent | 04ecddb73dd83d1094a904b8d03c57880998daee (diff) | |
| download | lwn-2cb5cc8b09c939c77826635956c35995b15c9331.tar.gz lwn-2cb5cc8b09c939c77826635956c35995b15c9331.zip | |
ext4: support read-only images
Add a rocompat feature, "readonly" to mark a FS image as read-only.
The feature prevents the kernel and e2fsprogs from changing the image;
the flag can be toggled by tune2fs.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b7f393df2e4c..7fec2efd8635 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1530,6 +1530,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei) * GDT_CSUM bits are mutually exclusive. */ #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400 +#define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 |