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authorLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 10:27:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 10:27:28 -0800
commitb2034d474b7e1e8578bd5c2977024b51693269d9 (patch)
treee43969bf7c2ba89884c2580f56978826f1014520 /Documentation/filesystems
parent27d189c02ba25851973c8582e419c0bded9f7e5b (diff)
parent924241575a85249b9d410e38f5b2fcad9035e45c (diff)
downloadlinux-b2034d474b7e1e8578bd5c2977024b51693269d9.tar.bz2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (41 commits) fs: add documentation on fallocate hole punching Gfs2: fail if we try to use hole punch Btrfs: fail if we try to use hole punch Ext4: fail if we try to use hole punch Ocfs2: handle hole punching via fallocate properly XFS: handle hole punching via fallocate properly fs: add hole punching to fallocate vfs: pass struct file to do_truncate on O_TRUNC opens (try #2) fix signedness mess in rw_verify_area() on 64bit architectures fs: fix kernel-doc for dcache::prepend_path fs: fix kernel-doc for dcache::d_validate sanitize ecryptfs ->mount() switch afs move internal-only parts of ncpfs headers to fs/ncpfs switch ncpfs switch 9p pass default dentry_operations to mount_pseudo() switch hostfs switch affs switch configfs ...
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/porting9
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 07a32b42cf9c..266d2059b9b8 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -385,3 +385,12 @@ Documentation/filesystems/vfs.txt for more details.
on many or all directory inodes on the way down a path walk (to check for
exec permission). These must now be rcu-walk aware (flags & IPERM_RCU). See
Documentation/filesystems/vfs.txt for more details.
+
+--
+[mandatory]
+ In ->fallocate() you must check the mode option passed in. If your
+filesystem does not support hole punching (deallocating space in the middle of a
+file) you must return -EOPNOTSUPP if FALLOC_FL_PUNCH_HOLE is set in mode.
+Currently you can only have FALLOC_FL_PUNCH_HOLE with FALLOC_FL_KEEP_SIZE set,
+so the i_size should not change when hole punching, even when puching the end of
+a file off.