linux/fs/fuse
Miklos Szeredi 21f621741a fuse: fix LOOKUP vs INIT compat handling
Analysis from Marc:

 "Commit 7078187a79 ("fuse: introduce fuse_simple_request() helper")
  from the above pull request triggers some EIO errors for me in some tests
  that rely on fuse

  Looking at the code changes and a bit of debugging info I think there's a
  general problem here that fuse_get_req checks and possibly waits for
  fc->initialized, and this was always called first.  But this commit
  changes the ordering and in many places fc->minor is now possibly used
  before fuse_get_req, and we can't be sure that fc has been initialized.
  In my case fuse_lookup_init sets req->out.args[0].size to the wrong size
  because fc->minor at that point is still 0, leading to the EIO error."

Fix by moving the compat adjustments into fuse_simple_request() to after
fuse_get_req().

This is also more readable than the original, since now compatibility is
handled in a single function instead of cluttering each operation.

Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Fixes: 7078187a79 ("fuse: introduce fuse_simple_request() helper")
2015-01-06 10:45:35 +01:00
..
control.c fuse: add __exit to fuse_ctl_cleanup 2014-04-28 14:19:21 +02:00
cuse.c fuse: flush requests on umount 2014-12-12 09:49:04 +01:00
dev.c fuse: fix LOOKUP vs INIT compat handling 2015-01-06 10:45:35 +01:00
dir.c fuse: fix LOOKUP vs INIT compat handling 2015-01-06 10:45:35 +01:00
file.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2014-12-17 09:41:32 -08:00
fuse_i.h fuse: introduce fuse_simple_request() helper 2014-12-12 09:49:05 +01:00
inode.c fuse: fix LOOKUP vs INIT compat handling 2015-01-06 10:45:35 +01:00
Kconfig fuse: Move CUSE Kconfig entry from fs/Kconfig into fs/fuse/Kconfig 2013-01-17 13:08:45 +01:00
Makefile CUSE: implement CUSE - Character device in Userspace 2009-06-09 11:24:11 +02:00