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| author | Christian Brauner <brauner@kernel.org> | 2025-11-11 12:38:44 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-12 14:19:08 +0300 |
| commit | 04f0955b603cb49eeb752fc8cceca9e9b2f99e14 (patch) | |
| tree | bb2f97126c4e96f55c69c9c6b320e3dac8262429 /include | |
| parent | 854e8df2ce6b02c8be40d6f26bd8aa700b375bb2 (diff) | |
| parent | a0a28c4e41251a85b4b6db987a72ffbc8613e497 (diff) | |
| download | linux-04f0955b603cb49eeb752fc8cceca9e9b2f99e14.tar.xz | |
Merge patch series "cheaper MAY_EXEC handling for path lookup"
Mateusz Guzik <mjguzik@gmail.com> says:
In short, MAY_WRITE checks are elided.
This obsoletes the idea of pre-computing if perm checks are necessary as
that turned out to be too hairy. The new code has 2 more branches per
path component compared to that idea, but the perf difference for
typical paths (< 6 components) was basically within noise. To be
revisited if someone(tm) removes other slowdowns.
Instead of the pre-computing thing I added IOP_FASTPERM_MAY_EXEC so that
filesystems like btrfs can still avoid the hard work.
* patches from https://patch.msgid.link/20251107142149.989998-1-mjguzik@gmail.com:
fs: retire now stale MAY_WRITE predicts in inode_permission()
btrfs: utilize IOP_FASTPERM_MAY_EXEC
fs: speed up path lookup with cheaper handling of MAY_EXEC
Link: https://patch.msgid.link/20251107142149.989998-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index c895146c1444..ff69734b9fde 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -659,13 +659,14 @@ is_uncached_acl(struct posix_acl *acl) return (long)acl & 1; } -#define IOP_FASTPERM 0x0001 -#define IOP_LOOKUP 0x0002 -#define IOP_NOFOLLOW 0x0004 -#define IOP_XATTR 0x0008 +#define IOP_FASTPERM 0x0001 +#define IOP_LOOKUP 0x0002 +#define IOP_NOFOLLOW 0x0004 +#define IOP_XATTR 0x0008 #define IOP_DEFAULT_READLINK 0x0010 -#define IOP_MGTIME 0x0020 -#define IOP_CACHED_LINK 0x0040 +#define IOP_MGTIME 0x0020 +#define IOP_CACHED_LINK 0x0040 +#define IOP_FASTPERM_MAY_EXEC 0x0080 /* * Inode state bits. Protected by inode->i_lock |