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authorMiklos Szeredi <mszeredi@suse.cz>2015-01-06 12:45:35 +0300
committerMiklos Szeredi <mszeredi@suse.cz>2015-01-06 12:45:35 +0300
commit21f621741a770c119e7529a3f5c0e6b7c91383a3 (patch)
tree4393194807e351d0c2922673d44409a656a87259 /fs/fuse/inode.c
parentb1940cd21c0f4abdce101253e860feff547291b0 (diff)
downloadlinux-21f621741a770c119e7529a3f5c0e6b7c91383a3.tar.xz
fuse: fix LOOKUP vs INIT compat handling
Analysis from Marc: "Commit 7078187a795f ("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: 7078187a795f ("fuse: introduce fuse_simple_request() helper")
Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r--fs/fuse/inode.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 6749109f255d..6a20f2ff2c2e 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -424,8 +424,7 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
args.in.h.opcode = FUSE_STATFS;
args.in.h.nodeid = get_node_id(dentry->d_inode);
args.out.numargs = 1;
- args.out.args[0].size =
- fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
+ args.out.args[0].size = sizeof(outarg);
args.out.args[0].value = &outarg;
err = fuse_simple_request(fc, &args);
if (!err)