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fuse: allow control of adaptive readdirplus use

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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>
This commit is contained in:
Eric Wong 2013-02-06 22:29:01 +00:00 committed by Miklos Szeredi
parent 7e98d53086
commit 634734b63a
4 changed files with 12 additions and 2 deletions
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2
fs/fuse/dir.c
View File

@ -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)

5
fs/fuse/fuse_i.h
View File

@ -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;

4
fs/fuse/inode.c
View File

@ -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);

3
include/uapi/linux/fuse.h
View File

@ -218,6 +218,8 @@ struct fuse_file_lock {
* FUSE_FLOCK_LOCKS: remote locking for BSD style file locks
* FUSE_HAS_IOCTL_DIR: kernel supports ioctl on directories
* FUSE_AUTO_INVAL_DATA: automatically invalidate cached pages
* FUSE_DO_READDIRPLUS: do READDIRPLUS (READDIR+LOOKUP in one)
* FUSE_READDIRPLUS_AUTO: adaptive readdirplus
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -233,6 +235,7 @@ struct fuse_file_lock {
#define FUSE_HAS_IOCTL_DIR (1 << 11)
#define FUSE_AUTO_INVAL_DATA (1 << 12)
#define FUSE_DO_READDIRPLUS (1 << 13)
#define FUSE_READDIRPLUS_AUTO (1 << 14)
/**
* CUSE INIT request/reply flags