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| author | Jan Kara <jack@suse.cz> | 2021-08-16 11:57:07 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2021-08-30 23:36:51 -0400 |
| commit | 3a6541e97c035dba90cdf37169d73b2d8057e55d (patch) | |
| tree | 7a98a31422d7d5dcc9bd16ac7ff422be13a000ae /Documentation/filesystems/ext4/super.rst | |
| parent | 02f310fcf47fa9311d6ba2946a8d19e7d7d11f37 (diff) | |
| download | linux-3a6541e97c035dba90cdf37169d73b2d8057e55d.tar.gz | |
ext4: Orphan file documentation
Add documentation about the orphan file feature.
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210816095713.16537-4-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems/ext4/super.rst')
| -rw-r--r-- | Documentation/filesystems/ext4/super.rst | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/filesystems/ext4/super.rst b/Documentation/filesystems/ext4/super.rst index 2eb1ab20498d..f6a548e957bb 100644 --- a/Documentation/filesystems/ext4/super.rst +++ b/Documentation/filesystems/ext4/super.rst @@ -479,7 +479,11 @@ The ext4 superblock is laid out as follows in - Filename charset encoding flags. * - 0x280 - \_\_le32 - - s\_reserved[95] + - s\_orphan\_file\_inum + - Orphan file inode number. + * - 0x284 + - \_\_le32 + - s\_reserved[94] - Padding to the end of the block. * - 0x3FC - \_\_le32 @@ -603,6 +607,11 @@ following: the journal, JBD2 incompat feature (JBD2\_FEATURE\_INCOMPAT\_FAST\_COMMIT) gets set (COMPAT\_FAST\_COMMIT). + * - 0x1000 + - Orphan file allocated. This is the special file for more efficient + tracking of unlinked but still open inodes. When there may be any + entries in the file, we additionally set proper rocompat feature + (RO\_COMPAT\_ORPHAN\_PRESENT). .. _super_incompat: @@ -713,6 +722,10 @@ the following: - Filesystem tracks project quotas. (RO\_COMPAT\_PROJECT) * - 0x8000 - Verity inodes may be present on the filesystem. (RO\_COMPAT\_VERITY) + * - 0x10000 + - Indicates orphan file may have valid orphan entries and thus we need + to clean them up when mounting the filesystem + (RO\_COMPAT\_ORPHAN\_PRESENT). .. _super_def_hash: |