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| author | Matthew Garrett <mjg@redhat.com> | 2009-03-26 17:49:56 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-26 10:56:35 -0700 |
| commit | d0adde574b8487ef30f69e2d08bba769e4be513f (patch) | |
| tree | fa8b98978bc9ebe607cbdf78c4ed13eeb545ba80 | |
| parent | 11ff6f05f1e836a6a02369a4c4b64757e484adc1 (diff) | |
| download | lwn-d0adde574b8487ef30f69e2d08bba769e4be513f.tar.gz lwn-d0adde574b8487ef30f69e2d08bba769e4be513f.zip | |
Add a strictatime mount option
Add support for explicitly requesting full atime updates. This makes it
possible for kernels to default to relatime but still allow userspace to
override it.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/namespace.c | 6 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 | ||||
| -rw-r--r-- | include/linux/mount.h | 1 |
3 files changed, 7 insertions, 1 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 06f8e63f6cb1..d0659ec291c9 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -780,6 +780,7 @@ static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt) { MNT_NOATIME, ",noatime" }, { MNT_NODIRATIME, ",nodiratime" }, { MNT_RELATIME, ",relatime" }, + { MNT_STRICTATIME, ",strictatime" }, { 0, NULL } }; const struct proc_fs_info *fs_infop; @@ -1932,11 +1933,14 @@ long do_mount(char *dev_name, char *dir_name, char *type_page, mnt_flags |= MNT_NODIRATIME; if (flags & MS_RELATIME) mnt_flags |= MNT_RELATIME; + if (flags & MS_STRICTATIME) + mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME); if (flags & MS_RDONLY) mnt_flags |= MNT_READONLY; flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE | - MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT); + MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT | + MS_STRICTATIME); /* ... and get the mountpoint */ retval = kern_path(dir_name, LOOKUP_FOLLOW, &path); diff --git a/include/linux/fs.h b/include/linux/fs.h index 92734c0012e6..5bc81c4a98c1 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -141,6 +141,7 @@ struct inodes_stat_t { #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ #define MS_I_VERSION (1<<23) /* Update inode I_version field */ +#define MS_STRICTATIME (1<<24) /* Always perform atime updates */ #define MS_ACTIVE (1<<30) #define MS_NOUSER (1<<31) diff --git a/include/linux/mount.h b/include/linux/mount.h index cab2a85e2ee8..51f55f903aff 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -27,6 +27,7 @@ struct mnt_namespace; #define MNT_NODIRATIME 0x10 #define MNT_RELATIME 0x20 #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ +#define MNT_STRICTATIME 0x80 #define MNT_SHRINKABLE 0x100 #define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */ |