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authorMiklos Szeredi <miklos@szeredi.hu>2006-06-25 05:48:52 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:19 -0700
commit7142125937e1482ad3ae4366594c6586153dfc86 (patch)
tree8d85908a36485df0c80de2032e7fcfa493621fe4 /fs/fuse/inode.c
parentbafa96541b250a7051e3fbc5de6e8369daf8ffec (diff)
[PATCH] fuse: add POSIX file locking support
This patch adds POSIX file locking support to the fuse interface. This implementation doesn't keep any locking state in kernel. Unlocking on close() is handled by the FLUSH message, which now contains the lock owner id. Mandatory locking is not supported. The filesystem may enfoce mandatory locking in userspace if needed. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r--fs/fuse/inode.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 13a7e8ab7a78..412892905838 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -98,6 +98,14 @@ static void fuse_clear_inode(struct inode *inode)
}
}
+static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ if (*flags & MS_MANDLOCK)
+ return -EINVAL;
+
+ return 0;
+}
+
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
@@ -409,6 +417,7 @@ static struct super_operations fuse_super_operations = {
.destroy_inode = fuse_destroy_inode,
.read_inode = fuse_read_inode,
.clear_inode = fuse_clear_inode,
+ .remount_fs = fuse_remount_fs,
.put_super = fuse_put_super,
.umount_begin = fuse_umount_begin,
.statfs = fuse_statfs,
@@ -428,8 +437,12 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
if (arg->flags & FUSE_ASYNC_READ)
fc->async_read = 1;
- } else
+ if (!(arg->flags & FUSE_POSIX_LOCKS))
+ fc->no_lock = 1;
+ } else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
+ fc->no_lock = 1;
+ }
fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
fc->minor = arg->minor;
@@ -447,7 +460,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
- arg->flags |= FUSE_ASYNC_READ;
+ arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
@@ -479,6 +492,9 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
struct fuse_req *init_req;
int err;
+ if (sb->s_flags & MS_MANDLOCK)
+ return -EINVAL;
+
if (!parse_fuse_opt((char *) data, &d))
return -EINVAL;