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xfs: more reserved blocks fixups

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This mangles the reserved blocks counts a little more.

1) add a helper function for the default reserved count
2) add helper functions to save/restore counts on ro/rw
3) save/restore reserved blocks on freeze/thaw
4) disallow changing reserved count while readonly

V2: changed field name to match Dave's changes

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Eric Sandeen
2010-02-05 22:59:53 +00:00
committed by Alex Elder
parent 388f1f0c34
commit d5db0f97fb
4 changed files with 64 additions and 25 deletions
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3
fs/xfs/linux-2.6/xfs_ioctl.c
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@ -1431,6 +1431,9 @@ xfs_file_ioctl(
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (mp->m_flags & XFS_MOUNT_RDONLY)
return -XFS_ERROR(EROFS);
if (copy_from_user(&inout, arg, sizeof(inout)))
return -XFS_ERROR(EFAULT);