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authorEric Wong <normalperson@yhbt.net>2013-02-06 22:29:01 +0000
committerMiklos Szeredi <mszeredi@suse.cz>2013-02-07 14:25:44 +0100
commit634734b63ac39e137a1c623ba74f3e062b6577db (patch)
tree65e2414fb7d31005d473719f7158f29bc9ca48d0 /fs/fuse
parent7e98d53086d18c877cb44e9065219335184024de (diff)
downloadlinux-634734b63ac39e137a1c623ba74f3e062b6577db.tar.bz2
fuse: allow control of adaptive readdirplus use
For some filesystems (e.g. GlusterFS), the cost of performing a normal readdir and readdirplus are identical. Since adaptively using readdirplus has no benefit for those systems, give users/filesystems the option to control adaptive readdirplus use. v2 of this patch incorporates Miklos's suggestion to simplify the code, as well as improving consistency of macro names and documentation. Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dir.c2
-rw-r--r--fs/fuse/fuse_i.h5
-rw-r--r--fs/fuse/inode.c4
3 files changed, 9 insertions, 2 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 2b112d978e9f..85065221a58a 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -21,6 +21,8 @@ static bool fuse_use_readdirplus(struct inode *dir, struct file *filp)
if (!fc->do_readdirplus)
return false;
+ if (!fc->readdirplus_auto)
+ return true;
if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
return true;
if (filp->f_pos == 0)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index fc55dd33c1e2..6aeba864f070 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -514,9 +514,12 @@ struct fuse_conn {
/** Use enhanced/automatic page cache invalidation. */
unsigned auto_inval_data:1;
- /** Does the filesystem support readdir-plus? */
+ /** Does the filesystem support readdirplus? */
unsigned do_readdirplus:1;
+ /** Does the filesystem want adaptive readdirplus? */
+ unsigned readdirplus_auto:1;
+
/** The number of requests waiting for completion */
atomic_t num_waiting;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 9876a87255fe..01353ed75750 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -866,6 +866,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->auto_inval_data = 1;
if (arg->flags & FUSE_DO_READDIRPLUS)
fc->do_readdirplus = 1;
+ if (arg->flags & FUSE_READDIRPLUS_AUTO)
+ fc->readdirplus_auto = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@@ -893,7 +895,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
- FUSE_DO_READDIRPLUS;
+ FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);