From 5a5fb1ea74d8b82ca1461b885a1334fb21e037be Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Wed, 26 Apr 2006 10:48:55 +0200 Subject: Revert "[fuse] fix deadlock between fuse_put_super() and request_end()" This reverts 73ce8355c243a434524a34c05cc417dd0467996e commit. It was wrong, because it didn't take into account the requirement, that iput() for background requests must be performed synchronously with ->put_super(), otherwise active inodes may remain after unmount. The right solution is to keep the sbput_sem and perform iput() within the locked region, but move fput() outside sbput_sem. Signed-off-by: Miklos Szeredi --- fs/fuse/dev.c | 28 ++++++++++++---------------- 1 file changed, 12 insertions(+), 16 deletions(-) (limited to 'fs/fuse/dev.c') diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index cc750c68fe70..4967bd40b953 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -128,14 +128,20 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) } } -void fuse_remove_background(struct fuse_conn *fc, struct fuse_req *req) +void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req) { - list_del_init(&req->bg_entry); + iput(req->inode); + iput(req->inode2); + if (req->file) + fput(req->file); + spin_lock(&fc->lock); + list_del(&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); } /* @@ -165,27 +171,17 @@ 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); } } -- cgit v1.2.3