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fuse fixes for 5.0-rc6

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Merge tag 'fuse-fixes-5.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:
 "A fix for a CUSE regression introduced in v4.20, as well as fixes for
  a couple of old bugs"

* tag 'fuse-fixes-5.0-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: decrement NR_WRITEBACK_TEMP on the right page
  fuse: call pipe_buf_release() under pipe lock
  cuse: fix ioctl
  fuse: handle zero sized retrieve correctly
This commit is contained in:
Linus Torvalds 2019-02-07 07:52:08 +00:00
commit 076a3f5537
3 changed files with 5 additions and 3 deletions
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4
fs/fuse/dev.c
View File

@ -1742,7 +1742,6 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
req->in.h.nodeid = outarg->nodeid;
req->in.numargs = 2;
req->in.argpages = 1;
req->page_descs[0].offset = offset;
req->end = fuse_retrieve_end;
index = outarg->offset >> PAGE_SHIFT;
@ -1757,6 +1756,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
this_num = min_t(unsigned, num, PAGE_SIZE - offset);
req->pages[req->num_pages] = page;
req->page_descs[req->num_pages].offset = offset;
req->page_descs[req->num_pages].length = this_num;
req->num_pages++;
@ -2077,8 +2077,10 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
ret = fuse_dev_do_write(fud, &cs, len);
pipe_lock(pipe);
for (idx = 0; idx < nbuf; idx++)
pipe_buf_release(pipe, &bufs[idx]);
pipe_unlock(pipe);
out:
kvfree(bufs);

2
fs/fuse/file.c
View File

@ -1782,7 +1782,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
spin_unlock(&fc->lock);
dec_wb_stat(&bdi->wb, WB_WRITEBACK);
dec_node_page_state(page, NR_WRITEBACK_TEMP);
dec_node_page_state(new_req->pages[0], NR_WRITEBACK_TEMP);
wb_writeout_inc(&bdi->wb);
fuse_writepage_free(fc, new_req);
fuse_request_free(new_req);

2
fs/fuse/inode.c
View File

@ -628,6 +628,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns)
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
fc->user_ns = get_user_ns(user_ns);
fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
}
EXPORT_SYMBOL_GPL(fuse_conn_init);
@ -1162,7 +1163,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc->user_id = d.user_id;
fc->group_id = d.group_id;
fc->max_read = max_t(unsigned, 4096, d.max_read);
fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
/* Used by get_root_inode() */
sb->s_fs_info = fc;