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    Subject[RFC][PATCH 3/8] create fs flags to mark c/r supported fs's
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    There are plenty of filesystems that are not supported for
    c/r at this point. Think of things like hugetlbfs which
    are externally visible or pipefs which are kernel-internal.

    This provides a quick way to mark the filesystems as they
    get supported. We won't mark wery many filesystems
    explicitly for now. That's because we will assume that
    FS_REQUIRES_DEV implies FS_CHECKPOINTABLE for now. This
    assumption may need to get overridden in the future, but
    it should be OK for now.

    Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
    ---

    linux-2.6.git-dave/fs/nfs/super.c | 13 ++++++++-----
    linux-2.6.git-dave/include/linux/fs.h | 1 +
    2 files changed, 9 insertions(+), 5 deletions(-)

    diff -puN fs/nfs/super.c~FS_CHECKPOINTABLE-flag fs/nfs/super.c
    --- linux-2.6.git/fs/nfs/super.c~FS_CHECKPOINTABLE-flag 2009-02-27 12:07:38.000000000 -0800
    +++ linux-2.6.git-dave/fs/nfs/super.c 2009-02-27 12:07:38.000000000 -0800
    @@ -233,12 +233,15 @@ static int nfs_xdev_get_sb(struct file_s
    static void nfs_kill_super(struct super_block *);
    static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);

    +#define NFS_FS_FLAGS FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|\
    + FS_BINARY_MOUNTDATA|FS_CHECKPOINTABLE
    +
    static struct file_system_type nfs_fs_type = {
    .owner = THIS_MODULE,
    .name = "nfs",
    .get_sb = nfs_get_sb,
    .kill_sb = nfs_kill_super,
    - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
    + .fs_flags = NFS_FS_FLAGS,
    };

    struct file_system_type nfs_xdev_fs_type = {
    @@ -246,7 +249,7 @@ struct file_system_type nfs_xdev_fs_type
    .name = "nfs",
    .get_sb = nfs_xdev_get_sb,
    .kill_sb = nfs_kill_super,
    - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
    + .fs_flags = NFS_FS_FLAGS,
    };

    static const struct super_operations nfs_sops = {
    @@ -275,7 +278,7 @@ static struct file_system_type nfs4_fs_t
    .name = "nfs4",
    .get_sb = nfs4_get_sb,
    .kill_sb = nfs4_kill_super,
    - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
    + .fs_flags = NFS_FS_FLAGS,
    };

    struct file_system_type nfs4_xdev_fs_type = {
    @@ -283,7 +286,7 @@ struct file_system_type nfs4_xdev_fs_typ
    .name = "nfs4",
    .get_sb = nfs4_xdev_get_sb,
    .kill_sb = nfs4_kill_super,
    - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
    + .fs_flags = NFS_FS_FLAGS,
    };

    struct file_system_type nfs4_referral_fs_type = {
    @@ -291,7 +294,7 @@ struct file_system_type nfs4_referral_fs
    .name = "nfs4",
    .get_sb = nfs4_referral_get_sb,
    .kill_sb = nfs4_kill_super,
    - .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
    + .fs_flags = NFS_FS_FLAGS,
    };

    static const struct super_operations nfs4_sops = {
    diff -puN include/linux/fs.h~FS_CHECKPOINTABLE-flag include/linux/fs.h
    --- linux-2.6.git/include/linux/fs.h~FS_CHECKPOINTABLE-flag 2009-02-27 12:07:38.000000000 -0800
    +++ linux-2.6.git-dave/include/linux/fs.h 2009-02-27 12:07:38.000000000 -0800
    @@ -109,6 +109,7 @@ struct inodes_stat_t {
    #define FS_REQUIRES_DEV 1
    #define FS_BINARY_MOUNTDATA 2
    #define FS_HAS_SUBTYPE 4
    +#define FS_CHECKPOINTABLE 8
    #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
    #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move()
    * during rename() internally.
    _

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      Last update: 2009-02-27 21:39    [W:0.024 / U:0.656 seconds]
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