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authorChristoph Hellwig <hch@lst.de>2008-11-28 14:23:40 +1100
committerNiv Sardi <xaiki@sgi.com>2008-12-01 11:37:52 +1100
commit76d8b277f7b715f78ee3cb09ee112563639693a5 (patch)
tree49d4e3ae1d579e4fa353cfd32150c11512df7a78 /fs/xfs/xfs_inode.c
parent23fac50f959a87febf7ce4ae9d47525121f10c7a (diff)
downloadop-kernel-dev-76d8b277f7b715f78ee3cb09ee112563639693a5.zip
op-kernel-dev-76d8b277f7b715f78ee3cb09ee112563639693a5.tar.gz
[XFS] stop using xfs_itobp in xfs_iread
The only caller of xfs_itobp that doesn't have i_blkno setup is now the initial inode read. It needs access to the whole xfs_imap so using xfs_inotobp is not an option. Instead opencode the buffer lookup in xfs_iread and kill all the functionality for the initial map from xfs_itobp. (First sent on October 21st) Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Niv Sardi <xaiki@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c80
1 files changed, 34 insertions, 46 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 083395c..1d5c28b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -262,15 +262,11 @@ xfs_inotobp(
* If a non-zero error is returned, then the contents of bpp and
* dipp are undefined.
*
- * If the inode is new and has not yet been initialized, use xfs_imap()
- * to determine the size and location of the buffer to read from disk.
- * If the inode has already been mapped to its buffer and read in once,
- * then 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()).
- * We can tell whether the inode has been mapped in before by comparing
- * its disk block address to 0. Only uninitialized inodes will have
- * 0 for the disk block address.
+ * The inode is expected to already been mapped to its buffer and read
+ * 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()).
*/
int
xfs_itobp(
@@ -279,40 +275,19 @@ xfs_itobp(
xfs_inode_t *ip,
xfs_dinode_t **dipp,
xfs_buf_t **bpp,
- xfs_daddr_t bno,
- uint imap_flags,
uint buf_flags)
{
xfs_imap_t imap;
xfs_buf_t *bp;
int error;
- if (ip->i_blkno == (xfs_daddr_t)0) {
- imap.im_blkno = bno;
- error = xfs_imap(mp, tp, ip->i_ino, &imap,
- XFS_IMAP_LOOKUP | imap_flags);
- if (error)
- return error;
+ ASSERT(ip->i_blkno != 0);
- /*
- * Fill in the fields in the inode that will be used to
- * map the inode to its buffer from now on.
- */
- ip->i_blkno = imap.im_blkno;
- ip->i_len = imap.im_len;
- ip->i_boffset = imap.im_boffset;
- } else {
- /*
- * We've already mapped the inode once, so just use the
- * mapping that we saved the first time.
- */
- imap.im_blkno = ip->i_blkno;
- imap.im_len = ip->i_len;
- imap.im_boffset = ip->i_boffset;
- }
- ASSERT(bno == 0 || bno == imap.im_blkno);
+ imap.im_blkno = ip->i_blkno;
+ imap.im_len = ip->i_len;
+ imap.im_boffset = ip->i_boffset;
- error = xfs_imap_to_bp(mp, tp, &imap, &bp, buf_flags, imap_flags);
+ error = xfs_imap_to_bp(mp, tp, &imap, &bp, buf_flags, 0);
if (error)
return error;
@@ -882,6 +857,7 @@ xfs_iread(
xfs_buf_t *bp;
xfs_dinode_t *dip;
xfs_inode_t *ip;
+ xfs_imap_t imap;
int error;
ip = xfs_inode_alloc(mp, ino);
@@ -889,15 +865,27 @@ xfs_iread(
return ENOMEM;
/*
- * Get pointer's to the on-disk inode and the buffer containing it.
- * If the inode number refers to a block outside the file system
- * then xfs_itobp() will return NULL. In this case we should
- * return NULL as well. Set i_blkno to 0 so that xfs_itobp() will
- * know that this is a new incore inode.
+ * Get pointers to the on-disk inode and the buffer containing it.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &bp, bno, imap_flags, XFS_BUF_LOCK);
+ imap.im_blkno = bno;
+ error = xfs_imap(mp, tp, ip->i_ino, &imap,
+ XFS_IMAP_LOOKUP | imap_flags);
+ if (error)
+ goto out_destroy_inode;
+
+ /*
+ * Fill in the fields in the inode that will be used to
+ * map the inode to its buffer from now on.
+ */
+ ip->i_blkno = imap.im_blkno;
+ ip->i_len = imap.im_len;
+ ip->i_boffset = imap.im_boffset;
+ ASSERT(bno == 0 || bno == imap.im_blkno);
+
+ error = xfs_imap_to_bp(mp, tp, &imap, &bp, XFS_BUF_LOCK, imap_flags);
if (error)
goto out_destroy_inode;
+ dip = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset);
/*
* If we got something that isn't an inode it means someone
@@ -1878,7 +1866,7 @@ xfs_iunlink(
* Here we put the head pointer into our next pointer,
* and then we fall through to point the head at us.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0, XFS_BUF_LOCK);
+ error = xfs_itobp(mp, tp, ip, &dip, &ibp, XFS_BUF_LOCK);
if (error)
return error;
@@ -1960,7 +1948,7 @@ xfs_iunlink_remove(
* of dealing with the buffer when there is no need to
* change it.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0, XFS_BUF_LOCK);
+ error = xfs_itobp(mp, tp, ip, &dip, &ibp, XFS_BUF_LOCK);
if (error) {
cmn_err(CE_WARN,
"xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.",
@@ -2022,7 +2010,7 @@ xfs_iunlink_remove(
* Now last_ibp points to the buffer previous to us on
* the unlinked list. Pull us from the list.
*/
- error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0, XFS_BUF_LOCK);
+ error = xfs_itobp(mp, tp, ip, &dip, &ibp, XFS_BUF_LOCK);
if (error) {
cmn_err(CE_WARN,
"xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.",
@@ -2277,7 +2265,7 @@ xfs_ifree(
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, 0, 0, XFS_BUF_LOCK);
+ error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, XFS_BUF_LOCK);
if (error)
return error;
@@ -3191,7 +3179,7 @@ xfs_iflush(
/*
* Get the buffer containing the on-disk inode.
*/
- error = xfs_itobp(mp, NULL, ip, &dip, &bp, 0, 0,
+ error = xfs_itobp(mp, NULL, ip, &dip, &bp,
noblock ? XFS_BUF_TRYLOCK : XFS_BUF_LOCK);
if (error || !bp) {
xfs_ifunlock(ip);
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