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Subject[RFC][PATCH 3/8] create fs flags to mark c/r supported fs's
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Date

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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