linux/fs/9p
Dominique Martinet 22e424feb6 Revert "fs/9p: search open fids first"
This reverts commit 478ba09edc.

That commit was meant as a fix for setattrs with by fd (e.g. ftruncate)
to use an open fid instead of the first fid it found on lookup.
The proper fix for that is to use the fid associated with the open file
struct, available in iattr->ia_file for such operations, and was
actually done just before in 6624664160 ("9p: retrieve fid from file
when file instance exist.")
As such, this commit is no longer required.

Furthermore, changing lookup to return open fids first had unwanted side
effects, as it turns out the protocol forbids the use of open fids for
further walks (e.g. clone_fid) and we broke mounts for some servers
enforcing this rule.

Note this only reverts to the old working behaviour, but it's still
possible for lookup to return open fids if dentry->d_fsdata is not set,
so more work is needed to make sure we respect this rule in the future,
for example by adding a flag to the lookup functions to only match
certain fid open modes depending on caller requirements.

Link: https://lkml.kernel.org/r/20220130130651.712293-1-asmadeus@codewreck.org
Fixes: 478ba09edc ("fs/9p: search open fids first")
Cc: stable@vger.kernel.org # v5.11+
Reported-by: ron minnich <rminnich@gmail.com>
Reported-by: ng@0x80.stream
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2022-01-30 22:13:37 +09:00
..
acl.c 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
acl.h 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
cache.c 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
cache.h 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
fid.c Revert "fs/9p: search open fids first" 2022-01-30 22:13:37 +09:00
fid.h 9p: apply review requests for fid refcounting 2020-11-19 17:21:34 +01:00
Kconfig 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
v9fs_vfs.h 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
v9fs.c 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
v9fs.h 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
vfs_addr.c 9p-for-5.17-rc1: fixes, split 9p_net_fd, new reviewer 2022-01-16 07:36:49 +02:00
vfs_dentry.c 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00
vfs_dir.c 9p: Use fscache indexing rewrite and reenable caching 2022-01-10 11:53:06 +00:00
vfs_file.c 9p-for-5.17-rc1: fixes, split 9p_net_fd, new reviewer 2022-01-16 07:36:49 +02:00
vfs_inode_dotl.c 9p-for-5.17-rc1: fixes, split 9p_net_fd, new reviewer 2022-01-16 07:36:49 +02:00
vfs_inode.c 9p: Copy local writes to the cache when writing to the server 2022-01-10 11:53:25 +00:00
vfs_super.c 9p: Copy local writes to the cache when writing to the server 2022-01-10 11:53:25 +00:00
xattr.c 9p: fix file headers 2021-11-03 17:45:04 +09:00
xattr.h 9p: fix a bunch of checkpatch warnings 2021-11-04 21:04:25 +09:00