Messages in this thread Patch in this message | | | Subject | [RFC][PATCH 3/8] create fs flags to mark c/r supported fs's | From | Dave Hansen <> | Date | Fri, 27 Feb 2009 12:34:28 -0800 |
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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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