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ocfs2: Support xfs style space reservation ioctls

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We re-use the RESVSP/UNRESVSP ioctls from xfs which allow the user to
allocate and deallocate regions to a file without zeroing data or changing
i_size.

Though renamed, the structure passed in from user is identical to struct
xfs_flock64. The three fields that are actually used right now are l_whence,
l_start and l_len.

This should get ocfs2 immediate compatibility with userspace software using
the pre-existing xfs ioctls.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh
2007-03-09 16:53:21 -08:00
parent 063c4561f5
commit b25801038d
6 changed files with 216 additions and 16 deletions
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4
fs/ocfs2/super.c
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@@ -115,8 +115,6 @@ static void ocfs2_write_super(struct super_block *sb);
static struct inode *ocfs2_alloc_inode(struct super_block *sb);
static void ocfs2_destroy_inode(struct inode *inode);
static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);
static const struct super_operations ocfs2_sops = {
.statfs = ocfs2_statfs,
.alloc_inode = ocfs2_alloc_inode,
@@ -321,7 +319,7 @@ static void ocfs2_destroy_inode(struct inode *inode)
/* From xfs_super.c:xfs_max_file_offset
* Copyright (c) 2000-2004 Silicon Graphics, Inc.
*/
static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
{
unsigned int pagefactor = 1;
unsigned int bitshift = BITS_PER_LONG - 1;