[RFC][PATCH 1/5] create fs flag to mark c/r supported fs's

Dave Hansen
2009-02-19T18:21:28Z

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 make the "normal" filesystems
which are currently supported. This is also safe if any
new code gets added. We assume that a fs is non-supported
unless someone takes explicit action to the contrary.

I bet there are some more filesystems that are OK, but
these probably cover 99% of the users for now.

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

linux-2.6.git-dave/fs/ext2/super.c | 2 +-
linux-2.6.git-dave/fs/ext3/super.c | 2 +-
linux-2.6.git-dave/fs/ext4/super.c | 4 ++--
linux-2.6.git-dave/fs/fat/namei_msdos.c | 2 +-
linux-2.6.git-dave/fs/fat/namei_vfat.c | 2 +-
linux-2.6.git-dave/fs/jfs/super.c | 2 +-
linux-2.6.git-dave/fs/minix/inode.c | 2 +-
linux-2.6.git-dave/fs/reiserfs/super.c | 2 +-
linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_super.c | 2 +-
linux-2.6.git-dave/include/linux/fs.h | 1 +
10 files changed, 11 insertions(+), 10 deletions(-)

diff -puN fs/ext2/super.c~sb_op-for-checkpointable-files fs/ext2/super.c
--- linux-2.6.git/fs/ext2/super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/ext2/super.c 2009-02-19 10:17:23.000000000 -0800
@@ -1401,7 +1401,7 @@ static struct file_system_type ext2_fs_t
.name = "ext2",
.get_sb = ext2_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static int __init init_ext2_fs(void)
diff -puN fs/ext3/super.c~sb_op-for-checkpointable-files fs/ext3/super.c
--- linux-2.6.git/fs/ext3/super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/ext3/super.c 2009-02-19 10:17:23.000000000 -0800
@@ -2969,7 +2969,7 @@ static struct file_system_type ext3_fs_t
.name = "ext3",
.get_sb = ext3_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static int __init init_ext3_fs(void)
diff -puN fs/ext4/super.c~sb_op-for-checkpointable-files fs/ext4/super.c
--- linux-2.6.git/fs/ext4/super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/ext4/super.c 2009-02-19 10:17:23.000000000 -0800
@@ -3543,7 +3543,7 @@ static struct file_system_type ext4_fs_t
.name = "ext4",
.get_sb = ext4_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

#ifdef CONFIG_EXT4DEV_COMPAT
@@ -3562,7 +3562,7 @@ static struct file_system_type ext4dev_f
.name = "ext4dev",
.get_sb = ext4dev_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};
MODULE_ALIAS("ext4dev");
#endif
diff -puN fs/fat/namei_msdos.c~sb_op-for-checkpointable-files fs/fat/namei_msdos.c
--- linux-2.6.git/fs/fat/namei_msdos.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/fat/namei_msdos.c 2009-02-19 10:17:23.000000000 -0800
@@ -685,7 +685,7 @@ static struct file_system_type msdos_fs_
.name = "msdos",
.get_sb = msdos_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static int __init init_msdos_fs(void)
diff -puN fs/fat/namei_vfat.c~sb_op-for-checkpointable-files fs/fat/namei_vfat.c
--- linux-2.6.git/fs/fat/namei_vfat.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/fat/namei_vfat.c 2009-02-19 10:17:23.000000000 -0800
@@ -1077,7 +1077,7 @@ static struct file_system_type vfat_fs_t
.name = "vfat",
.get_sb = vfat_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static int __init init_vfat_fs(void)
diff -puN fs/jfs/super.c~sb_op-for-checkpointable-files fs/jfs/super.c
--- linux-2.6.git/fs/jfs/super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/jfs/super.c 2009-02-19 10:17:23.000000000 -0800
@@ -757,7 +757,7 @@ static struct file_system_type jfs_fs_ty
.name = "jfs",
.get_sb = jfs_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static void init_once(void *foo)
diff -puN fs/minix/inode.c~sb_op-for-checkpointable-files fs/minix/inode.c
--- linux-2.6.git/fs/minix/inode.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/minix/inode.c 2009-02-19 10:17:23.000000000 -0800
@@ -623,7 +623,7 @@ static struct file_system_type minix_fs_
.name = "minix",
.get_sb = minix_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

static int __init init_minix_fs(void)
diff -puN fs/reiserfs/super.c~sb_op-for-checkpointable-files fs/reiserfs/super.c
--- linux-2.6.git/fs/reiserfs/super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/reiserfs/super.c 2009-02-19 10:17:23.000000000 -0800
@@ -2284,7 +2284,7 @@ struct file_system_type reiserfs_fs_type
.name = "reiserfs",
.get_sb = get_super_block,
.kill_sb = reiserfs_kill_sb,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

MODULE_DESCRIPTION("ReiserFS journaled filesystem");
diff -puN fs/xfs/linux-2.6/xfs_super.c~sb_op-for-checkpointable-files fs/xfs/linux-2.6/xfs_super.c
--- linux-2.6.git/fs/xfs/linux-2.6/xfs_super.c~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/fs/xfs/linux-2.6/xfs_super.c 2009-02-19 10:17:23.000000000 -0800
@@ -1866,7 +1866,7 @@ static struct file_system_type xfs_fs_ty
.name = "xfs",
.get_sb = xfs_fs_get_sb,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_CHECKPOINTABLE,
};

STATIC int __init
diff -puN include/linux/fs.h~sb_op-for-checkpointable-files include/linux/fs.h
--- linux-2.6.git/include/linux/fs.h~sb_op-for-checkpointable-files 2009-02-19 10:17:23.000000000 -0800
+++ linux-2.6.git-dave/include/linux/fs.h 2009-02-19 10:17:23.000000000 -0800
@@ -104,6 +104,7 @@ extern int dir_notify_enable;
#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.
_