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fuse fixes for 6.11-rc7

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Merge tag 'fuse-fixes-6.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:

 - Fix EIO if splice and page stealing are enabled on the fuse device

 - Disable problematic combination of passthrough and writeback-cache

 - Other bug fixes found by code review

* tag 'fuse-fixes-6.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: disable the combination of passthrough and writeback cache
  fuse: update stats for pages in dropped aux writeback list
  fuse: clear PG_uptodate when using a stolen page
  fuse: fix memory leak in fuse_create_open
  fuse: check aborted connection before adding requests to pending list for resending
  fuse: use unsigned type for getxattr/listxattr size truncation
This commit is contained in:
Linus Torvalds 2024-09-03 12:32:00 -07:00
commit 88fac17500
5 changed files with 26 additions and 9 deletions
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14
fs/fuse/dev.c
View File

@ -31,6 +31,8 @@ MODULE_ALIAS("devname:fuse");
static struct kmem_cache *fuse_req_cachep;
static void end_requests(struct list_head *head);
static struct fuse_dev *fuse_get_dev(struct file *file)
{
/*
@ -773,7 +775,6 @@ static int fuse_check_folio(struct folio *folio)
(folio->flags & PAGE_FLAGS_CHECK_AT_PREP &
~(1 << PG_locked |
1 << PG_referenced |
1 << PG_uptodate |
1 << PG_lru |
1 << PG_active |
1 << PG_workingset |
@ -818,9 +819,7 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
newfolio = page_folio(buf->page);
if (!folio_test_uptodate(newfolio))
folio_mark_uptodate(newfolio);
folio_clear_uptodate(newfolio);
folio_clear_mappedtodisk(newfolio);
if (fuse_check_folio(newfolio) != 0)
@ -1822,6 +1821,13 @@ static void fuse_resend(struct fuse_conn *fc)
}
spin_lock(&fiq->lock);
if (!fiq->connected) {
spin_unlock(&fiq->lock);
list_for_each_entry(req, &to_queue, list)
clear_bit(FR_PENDING, &req->flags);
end_requests(&to_queue);
return;
}
/* iq and pq requests are both oldest to newest */
list_splice(&to_queue, &fiq->pending);
fiq->ops->wake_pending_and_unlock(fiq);

2
fs/fuse/dir.c
View File

@ -670,7 +670,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
err = get_create_ext(&args, dir, entry, mode);
if (err)
goto out_put_forget_req;
goto out_free_ff;
err = fuse_simple_request(fm, &args);
free_ext_value(&args);

8
fs/fuse/file.c
View File

@ -1832,10 +1832,16 @@ __acquires(fi->lock)
fuse_writepage_finish(fm, wpa);
spin_unlock(&fi->lock);
/* After fuse_writepage_finish() aux request list is private */
/* After rb_erase() aux request list is private */
for (aux = wpa->next; aux; aux = next) {
struct backing_dev_info *bdi = inode_to_bdi(aux->inode);
next = aux->next;
aux->next = NULL;
dec_wb_stat(&bdi->wb, WB_WRITEBACK);
dec_node_page_state(aux->ia.ap.pages[0], NR_WRITEBACK_TEMP);
wb_writeout_inc(&bdi->wb);
fuse_writepage_free(aux);
}

7
fs/fuse/inode.c
View File

@ -1332,11 +1332,16 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
* on a stacked fs (e.g. overlayfs) themselves and with
* max_stack_depth == 1, FUSE fs can be stacked as the
* underlying fs of a stacked fs (e.g. overlayfs).
*
* Also don't allow the combination of FUSE_PASSTHROUGH
* and FUSE_WRITEBACK_CACHE, current design doesn't handle
* them together.
*/
if (IS_ENABLED(CONFIG_FUSE_PASSTHROUGH) &&
(flags & FUSE_PASSTHROUGH) &&
arg->max_stack_depth > 0 &&
arg->max_stack_depth <= FILESYSTEM_MAX_STACK_DEPTH) {
arg->max_stack_depth <= FILESYSTEM_MAX_STACK_DEPTH &&
!(flags & FUSE_WRITEBACK_CACHE)) {
fc->passthrough = 1;
fc->max_stack_depth = arg->max_stack_depth;
fm->sb->s_stack_depth = arg->max_stack_depth;

4
fs/fuse/xattr.c
View File

@ -81,7 +81,7 @@ ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
}
ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX);
ret = min_t(size_t, outarg.size, XATTR_SIZE_MAX);
if (ret == -ENOSYS) {
fm->fc->no_getxattr = 1;
ret = -EOPNOTSUPP;
@ -143,7 +143,7 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
}
ret = fuse_simple_request(fm, &args);
if (!ret && !size)
ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX);
ret = min_t(size_t, outarg.size, XATTR_LIST_MAX);
if (ret > 0 && size)
ret = fuse_verify_xattr_list(list, ret);
if (ret == -ENOSYS) {