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| author | Harshad Shirwadkar <harshadshirwadkar@gmail.com> | 2020-11-06 06:58:50 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-11-07 07:01:01 +0300 |
| commit | a44ad6835da52fdf4df2e482f45a167336555121 (patch) | |
| tree | 176af5bf4223b6e1a47b1817fa06fa439c3d0613 /fs/ext4/ext4.h | |
| parent | 7067b2619017d51e71686ca9756b454de0e5826a (diff) | |
| download | linux-a44ad6835da52fdf4df2e482f45a167336555121.tar.xz | |
ext4: describe fast_commit feature flags
Fast commit feature has flags in the file system as well in JBD2. The
meaning of fast commit feature flags can get confusing. Update docs
and code to add more documentation about it.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20201106035911.1942128-2-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 45fcdbf538d1..d513553ceafa 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1863,6 +1863,13 @@ static inline bool ext4_verity_in_progress(struct inode *inode) #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200 +/* + * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes + * incompatible only if fast commit blocks are present in the FS. Since we + * clear the journal (and thus the fast commit blocks), we don't mark FS as + * incompatible. We also have a JBD2 incompat feature, which gets set when + * there are fast commit blocks present in the journal. + */ #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800 |