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  1. 05 7月, 2017 19 次提交
  3. 28 6月, 2017 2 次提交
  5. 05 6月, 2017 2 次提交
  7. 29 5月, 2017 2 次提交
    • M
      ovl: filter trusted xattr for non-admin · a082c6f6
      由 Miklos Szeredi 提交于 
      Filesystems filter out extended attributes in the "trusted." domain for
unprivlieged callers.

Overlay calls underlying filesystem's method with elevated privs, so need
to do the filtering in overlayfs too.
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      a082c6f6
    • A
      ovl: mark upper merge dir with type origin entries "impure" · f3a15685
      由 Amir Goldstein 提交于 
      An upper dir is marked "impure" to let ovl_iterate() know that this
directory may contain non pure upper entries whose d_ino may need to be
read from the origin inode.

We already mark a non-merge dir "impure" when moving a non-pure child
entry inside it, to let ovl_iterate() know not to iterate the non-merge
dir directly.

Mark also a merge dir "impure" when moving a non-pure child entry inside
it and when copying up a child entry inside it.

This can be used to optimize ovl_iterate() to perform a "pure merge" of
upper and lower directories, merging the content of the directories,
without having to read d_ino from origin inodes.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      f3a15685
  9. 19 5月, 2017 3 次提交
  11. 18 5月, 2017 3 次提交
  13. 15 5月, 2017 1 次提交
    • A
      ovl: select EXPORTFS · 72d42504
      由 Arnd Bergmann 提交于 
      We get a link error when EXPORTFS is not enabled:

ERROR: "exportfs_encode_fh" [fs/overlayfs/overlay.ko] undefined!
ERROR: "exportfs_decode_fh" [fs/overlayfs/overlay.ko] undefined!

This adds a Kconfig 'select' statement for overlayfs, the same way that
it is done for the other users of exportfs.

Fixes: 3a1e819b ("ovl: store file handle of lower inode on copy up")
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      72d42504
  15. 05 5月, 2017 8 次提交
    • A
      ovl: persistent inode numbers for upper hardlinks · 5b6c9053
      由 Amir Goldstein 提交于 
      An upper type non directory dentry that is a copy up target
should have a reference to its lower copy up origin.

There are three ways for an upper type dentry to be instantiated:
1. A lower type dentry that is being copied up
2. An entry that is found in upper dir by ovl_lookup()
3. A negative dentry is hardlinked to an upper type dentry

In the first case, the lower reference is set before copy up.
In the second case, the lower reference is found by ovl_lookup().
In the last case of hardlinked upper dentry, it is not easy to
update the lower reference of the negative dentry.  Instead,
drop the newly hardlinked negative dentry from dcache and let
the next access call ovl_lookup() to find its lower reference.

This makes sure that the inode number reported by stat(2) after
the hardlink is created is the same inode number that will be
reported by stat(2) after mount cycle, which is the inode number
of the lower copy up origin of the hardlink source.

NOTE that this does not fix breaking of lower hardlinks on copy
up, but only fixes the case of lower nlink == 1, whose upper copy
up inode is hardlinked in upper dir.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      5b6c9053
    • M
      ovl: merge getattr for dir and nondir · 5b712091
      由 Miklos Szeredi 提交于 
      Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      5b712091
    • A
      ovl: constant st_ino/st_dev across copy up · 72b608f0
      由 Amir Goldstein 提交于 
      When all layers are on the same underlying filesystem, let stat(2) return
st_dev/st_ino values of the copy up origin inode if it is known.

This results in constant st_ino/st_dev representation of files in an
overlay mount before and after copy up.

When the underlying filesystem support NFS exportfs, the result is also
persistent st_ino/st_dev representation before and after mount cycle.

Lower hardlinks are broken on copy up to different upper files, so we
cannot use the lower origin st_ino for those different files, even for the
same fs case.

When all overlay layers are on the same fs, use overlay st_dev for non-dirs
to get the correct result from du -x.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      72b608f0
    • A
      ovl: persistent inode number for directories · b7a807dc
      由 Amir Goldstein 提交于 
      stat(2) on overlay directories reports the overlay temp inode
number, which is constant across copy up, but is not persistent.

When all layers are on the same fs, report the copy up origin inode
number for directories.

This inode number is persistent, unique across the overlay mount and
constant across copy up.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      b7a807dc
    • A
      ovl: set the ORIGIN type flag · 59548503
      由 Amir Goldstein 提交于 
      For directory entries, non zero oe->numlower implies OVL_TYPE_MERGE.
Define a new type flag OVL_TYPE_ORIGIN to indicate that an entry holds a
reference to its lower copy up origin.

For directory entries ORIGIN := MERGE && UPPER. For non-dir entries ORIGIN
means that a lower type dentry has been recently copied up or that we were
able to find the copy up origin from overlay.origin xattr.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      59548503
    • A
      ovl: lookup non-dir copy-up-origin by file handle · a9d01957
      由 Amir Goldstein 提交于 
      If overlay.origin xattr is found on a non-dir upper inode try to get lower
dentry by calling exportfs_decode_fh().

On failure to lookup by file handle to lower layer, do not lookup the copy
up origin by name, because the lower found by name could be another file in
case the upper file was renamed.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      a9d01957
    • A
      ovl: use an auxiliary var for overlay root entry · c22205d0
      由 Amir Goldstein 提交于 
      Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      c22205d0
    • A
      ovl: store file handle of lower inode on copy up · 3a1e819b
      由 Amir Goldstein 提交于 
      Sometimes it is interesting to know if an upper file is pure upper or a
copy up target, and if it is a copy up target, it may be interesting to
find the copy up origin.

This will be used to preserve lower inode numbers across copy up.

Store the lower inode file handle in upper inode extended attribute
overlay.origin on copy up to use it later for these cases.  Store the lower
filesystem uuid along side the file handle, so we can validate that we are
looking for the origin file in the original fs.

If lower fs does not support NFS export ops store a zero sized xattr so we
can always use the overlay.origin xattr to distinguish between a copy up
and a pure upper inode.
Signed-off-by: NAmir Goldstein <amir73il@gmail.com>
Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
      3a1e819b