linux-stable/fs/fuse
Miklos Szeredi 5c791fe1e2 fuse: make sure reclaim doesn't write the inode
In writeback cache mode mtime/ctime updates are cached, and flushed to the
server using the ->write_inode() callback.

Closing the file will result in a dirty inode being immediately written,
but in other cases the inode can remain dirty after all references are
dropped.  This result in the inode being written back from reclaim, which
can deadlock on a regular allocation while the request is being served.

The usual mechanisms (GFP_NOFS/PF_MEMALLOC*) don't work for FUSE, because
serving a request involves unrelated userspace process(es).

Instead do the same as for dirty pages: make sure the inode is written
before the last reference is gone.

 - fallocate(2)/copy_file_range(2): these call file_update_time() or
   file_modified(), so flush the inode before returning from the call

 - unlink(2), link(2) and rename(2): these call fuse_update_ctime(), so
   flush the ctime directly from this helper

Reported-by: chenguanyou <chenguanyou@xiaomi.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2021-10-22 17:03:01 +02:00
..
acl.c vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
control.c fuse: name fs_context consistently 2021-08-04 13:22:58 +02:00
cuse.c cuse: simplify refcount 2021-04-14 10:40:58 +02:00
dax.c \n 2021-08-30 10:24:50 -07:00
dev.c fuse: fix use after free in fuse_read_interrupt() 2021-08-04 13:22:58 +02:00
dir.c fuse: make sure reclaim doesn't write the inode 2021-10-22 17:03:01 +02:00
file.c fuse: make sure reclaim doesn't write the inode 2021-10-22 17:03:01 +02:00
fuse_i.h fuse: make sure reclaim doesn't write the inode 2021-10-22 17:03:01 +02:00
inode.c fuse: make sure reclaim doesn't write the inode 2021-10-22 17:03:01 +02:00
ioctl.c fuse: convert to fileattr 2021-04-12 15:04:30 +02:00
Kconfig
Makefile fuse: move ioctl to separate source file 2021-04-12 15:04:30 +02:00
readdir.c fuse: fix illegal access to inode with reused nodeid 2021-06-22 09:15:36 +02:00
virtio_fs.c fuse: clean up fuse_mount destruction 2021-10-21 10:01:39 +02:00
xattr.c fuse: extend FUSE_SETXATTR request 2021-04-14 10:40:57 +02:00