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Code Issues Releases Wiki Activity

fuse: Protect ff->reserved_req via corresponding fi->lock

Browse source 
This is rather natural action after previous patches, and it just decreases
load of fc->lock.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Kirill Tkhai 2018-11-09 13:33:32 +03:00 committed by Miklos Szeredi
parent c9d8f5f069
commit 6b675738ce
2 changed files with 10 additions and 5 deletions
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10
fs/fuse/dev.c
View file

@ -251,17 +251,18 @@ static struct fuse_req *get_reserved_req(struct fuse_conn *fc,
struct file *file)
{
struct fuse_req *req = NULL;
struct fuse_inode *fi = get_fuse_inode(file_inode(file));
struct fuse_file *ff = file->private_data;
do {
wait_event(fc->reserved_req_waitq, ff->reserved_req);
spin_lock(&fc->lock);
spin_lock(&fi->lock);
if (ff->reserved_req) {
req = ff->reserved_req;
ff->reserved_req = NULL;
req->stolen_file = get_file(file);
}
spin_unlock(&fc->lock);
spin_unlock(&fi->lock);
} while (!req);
return req;
@ -273,16 +274,17 @@ static struct fuse_req *get_reserved_req(struct fuse_conn *fc,
static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
{
struct file *file = req->stolen_file;
struct fuse_inode *fi = get_fuse_inode(file_inode(file));
struct fuse_file *ff = file->private_data;
WARN_ON(req->max_pages);
spin_lock(&fc->lock);
spin_lock(&fi->lock);
memset(req, 0, sizeof(*req));
fuse_request_init(req, NULL, NULL, 0);
BUG_ON(ff->reserved_req);
ff->reserved_req = req;
wake_up_all(&fc->reserved_req_waitq);
spin_unlock(&fc->lock);
spin_unlock(&fi->lock);
fput(file);
}

5
fs/fuse/fuse_i.h
View file

@ -166,7 +166,10 @@ struct fuse_file {
/** Fuse connection for this file */
struct fuse_conn *fc;
/** Request reserved for flush and release */
/*
* Request reserved for flush and release.
* Modified under relative fuse_inode::lock.
*/
struct fuse_req *reserved_req;
/** Kernel file handle guaranteed to be unique */