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authorMiklos Szeredi <mszeredi@suse.cz>2014-04-28 14:19:23 +0200
committerMiklos Szeredi <mszeredi@suse.cz>2014-04-28 14:19:23 +0200
commite27c9d3877a0d0479711a55f5cdd7ee91442da53 (patch)
tree5313ae3779a436d92b042c7584986c1f6f06afd4 /fs/fuse
parent1e18bda86e2dcc4ecb176213ee34649c93ad1396 (diff)
downloadlinux-e27c9d3877a0d0479711a55f5cdd7ee91442da53.tar.bz2
fuse: fuse: add time_gran to INIT_OUT
Allow userspace fs to specify time granularity. This is needed because with writeback_cache mode the kernel is responsible for generating mtime and ctime, but if the underlying filesystem doesn't support nanosecond granularity then the cache will contain a different value from the one stored on the filesystem resulting in a change of times after a cache flush. Make the default granularity 1s. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/inode.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 5997e4940512..560eafcdd6a7 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -891,6 +891,11 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->async_dio = 1;
if (arg->flags & FUSE_WRITEBACK_CACHE)
fc->writeback_cache = 1;
+ if (arg->time_gran && arg->time_gran <= 1000000000)
+ fc->sb->s_time_gran = arg->time_gran;
+ else
+ fc->sb->s_time_gran = 1000000000;
+
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;