This contains a couple of fixes:
- fid refcounting was incorrect in some corner cases and would
leak resources, only freed at umount time. The first three commits
fix three such cases
- cache=loose or fscache was broken when trying to write a partial
page to a file with no read permission since the rework a few releases
ago. The fix taken here is just to restore old behavior of using the
special 'writeback_fid' for such reads, which is open as root/RDWR
and such not get complains that we try to read on a WRONLY fid.
Long-term it'd be nice to get rid of this and not issue the read at
all (skip cache?) in such cases, but that direction hasn't progressed
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Merge tag '9p-for-5.19-rc4' of https://github.com/martinetd/linux
Pull 9pfs fixes from Dominique Martinet:
"A couple of fid refcount and fscache fixes:
- fid refcounting was incorrect in some corner cases and would leak
resources, only freed at umount time. The first three commits fix
three such cases
- 'cache=loose' or fscache was broken when trying to write a partial
page to a file with no read permission since the rework a few
releases ago.
The fix taken here is just to restore old behavior of using the
special 'writeback_fid' for such reads, which is open as root/RDWR
and such not get complains that we try to read on a WRONLY fid.
Long-term it'd be nice to get rid of this and not issue the read at
all (skip cache?) in such cases, but that direction hasn't
progressed"
* tag '9p-for-5.19-rc4' of https://github.com/martinetd/linux:
9p: fix EBADF errors in cached mode
9p: Fix refcounting during full path walks for fid lookups
9p: fix fid refcount leak in v9fs_vfs_get_link
9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl
3abc3ae553