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fuse: use per req lock for lock/unlock_request() 

Reuse req->waitq.lock for protecting FR_ABORTED and FR_LOCKED flags.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
This commit is contained in:
Miklos Szeredi 2015-07-01 16:25:58 +02:00
parent 825d6d3395
commit dc00809a53
2 changed files with 24 additions and 22 deletions
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42
fs/fuse/dev.c
View File

@ -656,16 +656,16 @@ void fuse_force_forget(struct file *file, u64 nodeid)
* anything that could cause a page-fault. If the request was already
* aborted bail out.
*/
static int lock_request(struct fuse_conn *fc, struct fuse_req *req)
static int lock_request(struct fuse_req *req)
{
int err = 0;
if (req) {
spin_lock(&fc->lock);
spin_lock(&req->waitq.lock);
if (test_bit(FR_ABORTED, &req->flags))
err = -ENOENT;
else
set_bit(FR_LOCKED, &req->flags);
spin_unlock(&fc->lock);
spin_unlock(&req->waitq.lock);
}
return err;
}
@ -674,22 +674,21 @@ static int lock_request(struct fuse_conn *fc, struct fuse_req *req)
* Unlock request. If it was aborted while locked, caller is responsible
* for unlocking and ending the request.
*/
static int unlock_request(struct fuse_conn *fc, struct fuse_req *req)
static int unlock_request(struct fuse_req *req)
{
int err = 0;
if (req) {
spin_lock(&fc->lock);
spin_lock(&req->waitq.lock);
if (test_bit(FR_ABORTED, &req->flags))
err = -ENOENT;
else
clear_bit(FR_LOCKED, &req->flags);
spin_unlock(&fc->lock);
spin_unlock(&req->waitq.lock);
}
return err;
}
struct fuse_copy_state {
struct fuse_conn *fc;
int write;
struct fuse_req *req;
struct iov_iter *iter;
@ -703,13 +702,10 @@ struct fuse_copy_state {
unsigned move_pages:1;
};
static void fuse_copy_init(struct fuse_copy_state *cs,
struct fuse_conn *fc,
int write,
static void fuse_copy_init(struct fuse_copy_state *cs, int write,
struct iov_iter *iter)
{
memset(cs, 0, sizeof(*cs));
cs->fc = fc;
cs->write = write;
cs->iter = iter;
}
@ -742,7 +738,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
struct page *page;
int err;
err = unlock_request(cs->fc, cs->req);
err = unlock_request(cs->req);
if (err)
return err;
@ -794,7 +790,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
iov_iter_advance(cs->iter, err);
}
return lock_request(cs->fc, cs->req);
return lock_request(cs->req);
}
/* Do as much copy to/from userspace buffer as we can */
@ -845,7 +841,7 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
struct page *newpage;
struct pipe_buffer *buf = cs->pipebufs;
err = unlock_request(cs->fc, cs->req);
err = unlock_request(cs->req);
if (err)
return err;
@ -902,12 +898,12 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
lru_cache_add_file(newpage);
err = 0;
spin_lock(&cs->fc->lock);
spin_lock(&cs->req->waitq.lock);
if (test_bit(FR_ABORTED, &cs->req->flags))
err = -ENOENT;
else
*pagep = newpage;
spin_unlock(&cs->fc->lock);
spin_unlock(&cs->req->waitq.lock);
if (err) {
unlock_page(newpage);
@ -927,7 +923,7 @@ out_fallback:
cs->pg = buf->page;
cs->offset = buf->offset;
err = lock_request(cs->fc, cs->req);
err = lock_request(cs->req);
if (err)
return err;
@ -943,7 +939,7 @@ static int fuse_ref_page(struct fuse_copy_state *cs, struct page *page,
if (cs->nr_segs == cs->pipe->buffers)
return -EIO;
err = unlock_request(cs->fc, cs->req);
err = unlock_request(cs->req);
if (err)
return err;
@ -1358,7 +1354,7 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to)
if (!iter_is_iovec(to))
return -EINVAL;
fuse_copy_init(&cs, fc, 1, to);
fuse_copy_init(&cs, 1, to);
return fuse_dev_do_read(fc, file, &cs, iov_iter_count(to));
}
@ -1380,7 +1376,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
if (!bufs)
return -ENOMEM;
fuse_copy_init(&cs, fc, 1, NULL);
fuse_copy_init(&cs, 1, NULL);
cs.pipebufs = bufs;
cs.pipe = pipe;
ret = fuse_dev_do_read(fc, in, &cs, len);
@ -1958,7 +1954,7 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from)
if (!iter_is_iovec(from))
return -EINVAL;
fuse_copy_init(&cs, fc, 0, from);
fuse_copy_init(&cs, 0, from);
return fuse_dev_do_write(fc, &cs, iov_iter_count(from));
}
@ -2023,7 +2019,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
}
pipe_unlock(pipe);
fuse_copy_init(&cs, fc, 0, NULL);
fuse_copy_init(&cs, 0, NULL);
cs.pipebufs = bufs;
cs.nr_segs = nbuf;
cs.pipe = pipe;
@ -2098,9 +2094,11 @@ __acquires(fc->lock)
list_for_each_entry_safe(req, next, &fc->io, list) {
req->out.h.error = -ECONNABORTED;
spin_lock(&req->waitq.lock);
set_bit(FR_ABORTED, &req->flags);
if (!test_bit(FR_LOCKED, &req->flags))
list_move(&req->list, &to_end);
spin_unlock(&req->waitq.lock);
}
while (!list_empty(&to_end)) {
req = list_first_entry(&to_end, struct fuse_req, list);

4
fs/fuse/fuse_i.h
View File

@ -289,6 +289,10 @@ enum fuse_req_flag {
/**
* A request to the client
*
* .waitq.lock protects the following fields:
* - FR_ABORTED
* - FR_LOCKED (may also be modified under fc->lock, tested under both)
*/
struct fuse_req {
/** This can be on either pending processing or io lists in