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[XFS] merge xfs_imap into xfs_dilocate

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xfs_imap is the only caller of xfs_dilocate and doesn't add any significant
value.  Merge the two functions and document the various cases we have for
inode cluster lookup in the new xfs_imap.

Also remove the unused im_agblkno and im_ioffset fields from struct xfs_imap
while we're at it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
This commit is contained in:
Christoph Hellwig 2008-11-28 14:23:41 +11:00 • committed by Niv Sardi
parent a194189503
commit 94e1b69d1a
5 changed files with 88 additions and 120 deletions
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60
fs/xfs/xfs_inode.c
View file

@ -266,7 +266,7 @@ xfs_inotobp(
* in once, thus we can use the mapping information stored in the inode
* rather than calling xfs_imap(). This allows us to avoid the overhead
* of looking at the inode btree for small block file systems
* (see xfs_dilocate()).
* (see xfs_imap()).
*/
int
xfs_itobp(
@ -2508,64 +2508,6 @@ xfs_idata_realloc(
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
}
/*
* Map inode to disk block and offset.
*
* mp -- the mount point structure for the current file system
* tp -- the current transaction
* ino -- the inode number of the inode to be located
* imap -- this structure is filled in with the information necessary
* to retrieve the given inode from disk
* flags -- flags to pass to xfs_dilocate indicating whether or not
* lookups in the inode btree were OK or not
*/
int
xfs_imap(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_ino_t ino,
xfs_imap_t *imap,
uint flags)
{
xfs_fsblock_t fsbno;
int len;
int off;
int error;
fsbno = imap->im_blkno ?
XFS_DADDR_TO_FSB(mp, imap->im_blkno) : NULLFSBLOCK;
error = xfs_dilocate(mp, tp, ino, &fsbno, &len, &off, flags);
if (error)
return error;
imap->im_blkno = XFS_FSB_TO_DADDR(mp, fsbno);
imap->im_len = XFS_FSB_TO_BB(mp, len);
imap->im_agblkno = XFS_FSB_TO_AGBNO(mp, fsbno);
imap->im_ioffset = (ushort)off;
imap->im_boffset = (ushort)(off << mp->m_sb.sb_inodelog);
/*
* If the inode number maps to a block outside the bounds
* of the file system then return NULL rather than calling
* read_buf and panicing when we get an error from the
* driver.
*/
if ((imap->im_blkno + imap->im_len) >
XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
"(imap->im_blkno (0x%llx) + imap->im_len (0x%llx)) > "
" XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) (0x%llx)",
(unsigned long long) imap->im_blkno,
(unsigned long long) imap->im_len,
XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
return EINVAL;
}
return 0;
}
void
xfs_idestroy_fork(
xfs_inode_t *ip,