linux.git/fs/overlayfs, branch v3.19

Merge branch 'iov_iter' into for-next

2014-12-09T01:39:29+00:00

ovl: ovl_dir_fsync() cleanup

2014-11-20T15:40:02+00:00

Check against !OVL_PATH_LOWER instead of OVL_PATH_MERGE.  For a copied up
directory the two are currently equivalent.

Signed-off-by: Miklos Szeredi

ovl: pass dentry into ovl_dir_read_merged()

2014-11-20T15:40:01+00:00

Pass dentry into ovl_dir_read_merged() insted of upperpath and lowerpath.
This cleans up callers and paves the way for multi-layer directory reads.

Signed-off-by: Miklos Szeredi

ovl: use lockless_dereference() for upperdentry

2014-11-20T15:40:01+00:00

Don't open code lockless_dereference() in ovl_upperdentry_dereference().

Signed-off-by: Miklos Szeredi

ovl: allow filenames with comma

2014-11-20T15:40:00+00:00

Allow option separator (comma) to be escaped with backslash.

Signed-off-by: Miklos Szeredi

ovl: fix race in private xattr checks

2014-11-20T15:40:00+00:00

Xattr operations can race with copy up.  This does not matter as long as
we consistently fiter out "trunsted.overlay.opaque" attribute on upper
directories.

Previously we checked parent against OVL_PATH_MERGE.  This is too general,
and prone to race with copy-up.  I.e. we found the parent to be on the
lower layer but ovl_dentry_real() would return the copied-up dentry,
possibly with the "opaque" attribute.

So instead use ovl_path_real() and decide to filter the attributes based on
the actual type of the dentry we'll use.

Signed-off-by: Miklos Szeredi

ovl: fix remove/copy-up race

2014-11-20T15:39:59+00:00

ovl_remove_and_whiteout() needs to check if upper dentry exists or not
after having locked upper parent directory.

Previously we used a "type" value computed before locking the upper parent
directory, which is susceptible to racing with copy-up.

There's a similar check in ovl_check_empty_and_clear().  This one is not
actually racy, since copy-up doesn't change the "emptyness" property of a
directory.  Add a comment to this effect, and check the existence of upper
dentry locally to make the code cleaner.

Signed-off-by: Miklos Szeredi

ovl: rename filesystem type to "overlay"

2014-11-20T15:39:59+00:00

Some distributions carry an "old" format of overlayfs while mainline has a
"new" format.

The distros will possibly want to keep the old overlayfs alongside the new
for compatibility reasons.

To make it possible to differentiate the two versions change the name of
the new one from "overlayfs" to "overlay".

Signed-off-by: Miklos Szeredi 
Reported-by: Serge Hallyn 
Cc: Andy Whitcroft

ovl: don't poison cursor

2014-11-05T13:49:38+00:00

ovl_cache_put() can be called from ovl_dir_reset() if the cache needs to be
rebuilt.  We did list_del() on the cursor, which results in an Oops on the
poisoned pointer in ovl_seek_cursor().

Reported-by: Jordi Pujol Palomer 
Signed-off-by: Miklos Szeredi 
Tested-by: Jordi Pujol Palomer 
Signed-off-by: Al Viro

vfs: make first argument of dir_context.actor typed

2014-10-31T21:48:54+00:00

Signed-off-by: Miklos Szeredi 
Signed-off-by: Al Viro