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    Subject[PATCH 1/2] 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>
    ---
    fs/namespace.c | 6 +++++-
    include/linux/fs.h | 1 +
    include/linux/mount.h | 1 +
    3 files changed, 7 insertions(+), 1 deletions(-)

    diff --git a/fs/namespace.c b/fs/namespace.c
    index 06f8e63..d0659ec 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 92734c0..5bc81c4 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 cab2a85..51f55f9 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 */
    --
    Matthew Garrett | mjg59@srcf.ucam.org

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      Last update: 2009-03-26 18:53    [W:0.024 / U:91.544 seconds]
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