[PATCH] man: document XFS_XFLAG_APPEND behavior for directories

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

For directories, the APPEND flag means that files cannot be unlinked
from the directory.  Files can be linked in or created, just not
unlinked.  Document this behavior, since it's been in the VFS for years
though not explicitly mentioned.  This patch is in preparation for
trying to hoist the fsgetxattr ioctl documentation to the man-pages
project.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 man/man2/ioctl_xfs_fsgetxattr.2 |    1 +
 1 file changed, 1 insertion(+)

diff --git a/man/man2/ioctl_xfs_fsgetxattr.2 b/man/man2/ioctl_xfs_fsgetxattr.2
index e2cbfca3..2c626a7e 100644
--- a/man/man2/ioctl_xfs_fsgetxattr.2
+++ b/man/man2/ioctl_xfs_fsgetxattr.2
@@ -104,6 +104,7 @@ will be returned.
 .B XFS_XFLAG_APPEND
 The file is append-only - it can only be opened in append mode for
 writing.
+For directories, this means that files cannot be unlinked from this directory.
 Only the superuser or a process possessing the CAP_LINUX_IMMUTABLE
 capability can set or clear this flag.
 .TP