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Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/mszeredi/fuse

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* 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/mszeredi/fuse:
  [fuse] Direct I/O  should not use fuse_reset_request
  [fuse] Don't init request twice
  [fuse] Fix accounting the number of waiting requests
  [fuse] fix deadlock between fuse_put_super() and request_end()
This commit is contained in:
Linus Torvalds 2006-04-14 09:11:34 -07:00
commit 9a7e9f1c60
4 changed files with 65 additions and 41 deletions
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54
fs/fuse/dev.c
View File

@ -92,48 +92,50 @@ struct fuse_req *fuse_get_req(struct fuse_conn *fc)
{
struct fuse_req *req;
sigset_t oldset;
int intr;
int err;
atomic_inc(&fc->num_waiting);
block_sigs(&oldset);
err = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
restore_sigs(&oldset);
if (err)
return ERR_PTR(-EINTR);
err = -EINTR;
if (intr)
goto out;
req = fuse_request_alloc();
err = -ENOMEM;
if (!req)
return ERR_PTR(-ENOMEM);
goto out;
atomic_inc(&fc->num_waiting);
fuse_request_init(req);
req->in.h.uid = current->fsuid;
req->in.h.gid = current->fsgid;
req->in.h.pid = current->pid;
req->waiting = 1;
return req;
out:
atomic_dec(&fc->num_waiting);
return ERR_PTR(err);
}
void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
{
if (atomic_dec_and_test(&req->count)) {
atomic_dec(&fc->num_waiting);
if (req->waiting)
atomic_dec(&fc->num_waiting);
fuse_request_free(req);
}
}
void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req)
void fuse_remove_background(struct fuse_conn *fc, struct fuse_req *req)
{
iput(req->inode);
iput(req->inode2);
if (req->file)
fput(req->file);
spin_lock(&fc->lock);
list_del(&req->bg_entry);
list_del_init(&req->bg_entry);
if (fc->num_background == FUSE_MAX_BACKGROUND) {
fc->blocked = 0;
wake_up_all(&fc->blocked_waitq);
}
fc->num_background--;
spin_unlock(&fc->lock);
}
/*
@ -163,17 +165,27 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
wake_up(&req->waitq);
fuse_put_request(fc, req);
} else {
struct inode *inode = req->inode;
struct inode *inode2 = req->inode2;
struct file *file = req->file;
void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
req->end = NULL;
req->inode = NULL;
req->inode2 = NULL;
req->file = NULL;
if (!list_empty(&req->bg_entry))
fuse_remove_background(fc, req);
spin_unlock(&fc->lock);
down_read(&fc->sbput_sem);
if (fc->mounted)
fuse_release_background(fc, req);
up_read(&fc->sbput_sem);
if (end)
end(fc, req);
else
fuse_put_request(fc, req);
if (file)
fput(file);
iput(inode);
iput(inode2);
}
}
@ -277,6 +289,10 @@ static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
list_add_tail(&req->list, &fc->pending);
req->state = FUSE_REQ_PENDING;
if (!req->waiting) {
req->waiting = 1;
atomic_inc(&fc->num_waiting);
}
wake_up(&fc->waitq);
kill_fasync(&fc->fasync, SIGIO, POLL_IN);
}

10
fs/fuse/file.c
View File

@ -1,6 +1,6 @@
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
@ -565,8 +565,12 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
buf += nres;
if (nres != nbytes)
break;
if (count)
fuse_reset_request(req);
if (count) {
fuse_put_request(fc, req);
req = fuse_get_req(fc);
if (IS_ERR(req))
break;
}
}
fuse_put_request(fc, req);
if (res > 0) {

15
fs/fuse/fuse_i.h
View File

@ -159,6 +159,9 @@ struct fuse_req {
/** Data is being copied to/from the request */
unsigned locked:1;
/** Request is counted as "waiting" */
unsigned waiting:1;
/** State of the request */
enum fuse_req_state state;
@ -255,15 +258,9 @@ struct fuse_conn {
/** waitq for blocked connection */
wait_queue_head_t blocked_waitq;
/** RW semaphore for exclusion with fuse_put_super() */
struct rw_semaphore sbput_sem;
/** The next unique request id */
u64 reqctr;
/** Mount is active */
unsigned mounted;
/** Connection established, cleared on umount, connection
abort and device release */
unsigned connected;
@ -474,11 +471,11 @@ void request_send_noreply(struct fuse_conn *fc, struct fuse_req *req);
void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
/**
* Release inodes and file associated with background request
* Remove request from the the background list
*/
void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req);
void fuse_remove_background(struct fuse_conn *fc, struct fuse_req *req);
/* Abort all requests */
/** Abort all requests */
void fuse_abort_conn(struct fuse_conn *fc);
/**

27
fs/fuse/inode.c
View File

@ -204,17 +204,26 @@ static void fuse_put_super(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
down_write(&fc->sbput_sem);
while (!list_empty(&fc->background))
fuse_release_background(fc,
list_entry(fc->background.next,
struct fuse_req, bg_entry));
spin_lock(&fc->lock);
fc->mounted = 0;
fc->connected = 0;
while (!list_empty(&fc->background)) {
struct fuse_req *req = list_entry(fc->background.next,
struct fuse_req, bg_entry);
struct inode *inode = req->inode;
struct inode *inode2 = req->inode2;
/* File would hold a reference to vfsmount */
BUG_ON(req->file);
req->inode = NULL;
req->inode2 = NULL;
fuse_remove_background(fc, req);
spin_unlock(&fc->lock);
iput(inode);
iput(inode2);
spin_lock(&fc->lock);
}
spin_unlock(&fc->lock);
up_write(&fc->sbput_sem);
/* Flush all readers on this fs */
kill_fasync(&fc->fasync, SIGIO, POLL_IN);
wake_up_all(&fc->waitq);
@ -386,7 +395,6 @@ static struct fuse_conn *new_conn(void)
INIT_LIST_HEAD(&fc->processing);
INIT_LIST_HEAD(&fc->io);
INIT_LIST_HEAD(&fc->background);
init_rwsem(&fc->sbput_sem);
kobj_set_kset_s(fc, connections_subsys);
kobject_init(&fc->kobj);
atomic_set(&fc->num_waiting, 0);
@ -541,7 +549,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
goto err_free_req;
sb->s_root = root_dentry;
fc->mounted = 1;
fc->connected = 1;
kobject_get(&fc->kobj);
file->private_data = fc;