btrfs: add support for RENAME_EXCHANGE and RENAME_WHITEOUT

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Two new flags, RENAME_EXCHANGE and RENAME_WHITEOUT, provide for new
behavior in the renameat2() syscall. This behavior is primarily used by
overlayfs. This patch adds support for these flags to btrfs, enabling it to
be used as a fully functional upper layer for overlayfs.

RENAME_EXCHANGE support was written by Davide Italiano originally
submitted on 2 April 2015.

Signed-off-by: Davide Italiano <dccitaliano@gmail.com>
Signed-off-by: Dan Fuhry <dfuhry@datto.com>
[ remove unlikely ]
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>

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This commit is contained in:

Dan Fuhry 2016-03-17 15:23:38 +01:00 • committed by Filipe Manana

parent c4aba95454

commit cdd1fedf82

1 changed files with 257 additions and 7 deletions

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264

fs/btrfs/inode.c

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