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xfs: stop using xfs_trans_iget in the RT allocator 

During mount we establish references to the RT inodes, which we keep for
the lifetime of the filesystem.  Instead of using xfs_trans_iget to grab
additional references when adding RT inodes to transactions use the
combination of xfs_ilock and xfs_trans_ijoin_ref, which archives the same
end result with less overhead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-02-13 13:25:31 +00:00 коммит произвёл Alex Elder
Родитель 5d15765594
Коммит 1050c71e29
2 изменённых файлов: 23 добавлений и 39 удалений
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8
fs/xfs/xfs_bmap.c
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@ -2333,7 +2333,6 @@ xfs_bmap_rtalloc(
xfs_extlen_t prod = 0; /* product factor for allocators */
xfs_extlen_t ralen = 0; /* realtime allocation length */
xfs_extlen_t align; /* minimum allocation alignment */
xfs_inode_t *ip; /* bitmap incore inode */
xfs_rtblock_t rtb;
mp = ap->ip->i_mount;
@ -2370,11 +2369,8 @@ xfs_bmap_rtalloc(
/*
* Lock out other modifications to the RT bitmap inode.
*/
error = xfs_trans_iget(mp, ap->tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP, &ip);
if (error)
return error;
ASSERT(ip == mp->m_rbmip);
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
/*
* If it's an allocation to an empty file at offset 0,

54
fs/xfs/xfs_rtalloc.c
Просмотреть файл

@ -76,7 +76,7 @@ xfs_growfs_rt_alloc(
xfs_mount_t *mp, /* file system mount point */
xfs_extlen_t oblocks, /* old count of blocks */
xfs_extlen_t nblocks, /* new count of blocks */
xfs_ino_t ino) /* inode number (bitmap/summary) */
xfs_inode_t *ip) /* inode (bitmap/summary) */
{
xfs_fileoff_t bno; /* block number in file */
xfs_buf_t *bp; /* temporary buffer for zeroing */
@ -86,7 +86,6 @@ xfs_growfs_rt_alloc(
xfs_fsblock_t firstblock; /* first block allocated in xaction */
xfs_bmap_free_t flist; /* list of freed blocks */
xfs_fsblock_t fsbno; /* filesystem block for bno */
xfs_inode_t *ip; /* pointer to incore inode */
xfs_bmbt_irec_t map; /* block map output */
int nmap; /* number of block maps */
int resblks; /* space reservation */
@ -112,9 +111,9 @@ xfs_growfs_rt_alloc(
/*
* Lock the inode.
*/
if ((error = xfs_trans_iget(mp, tp, ino, 0,
XFS_ILOCK_EXCL, &ip)))
goto error_cancel;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
xfs_bmap_init(&flist, &firstblock);
/*
* Allocate blocks to the bitmap file.
@ -155,9 +154,8 @@ xfs_growfs_rt_alloc(
/*
* Lock the bitmap inode.
*/
if ((error = xfs_trans_iget(mp, tp, ino, 0,
XFS_ILOCK_EXCL, &ip)))
goto error_cancel;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
/*
* Get a buffer for the block.
*/
@ -1854,7 +1852,6 @@ xfs_growfs_rt(
xfs_rtblock_t bmbno; /* bitmap block number */
xfs_buf_t *bp; /* temporary buffer */
int error; /* error return value */
xfs_inode_t *ip; /* bitmap inode, used as lock */
xfs_mount_t *nmp; /* new (fake) mount structure */
xfs_drfsbno_t nrblocks; /* new number of realtime blocks */
xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
@ -1918,11 +1915,11 @@ xfs_growfs_rt(
/*
* Allocate space to the bitmap and summary files, as necessary.
*/
if ((error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks,
mp->m_sb.sb_rbmino)))
error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
if (error)
return error;
if ((error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks,
mp->m_sb.sb_rsumino)))
error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
if (error)
return error;
/*
* Allocate a new (fake) mount/sb.
@ -1972,12 +1969,8 @@ xfs_growfs_rt(
/*
* Lock out other callers by grabbing the bitmap inode lock.
*/
error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP,
&ip);
if (error)
goto error_cancel;
ASSERT(ip == mp->m_rbmip);
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
/*
* Update the bitmap inode's size.
*/
@ -1988,11 +1981,8 @@ xfs_growfs_rt(
/*
* Get the summary inode into the transaction.
*/
error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0,
XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM, &ip);
if (error)
goto error_cancel;
ASSERT(ip == mp->m_rsumip);
xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
/*
* Update the summary inode's size.
*/
@ -2154,7 +2144,6 @@ xfs_rtfree_extent(
xfs_extlen_t len) /* length of extent freed */
{
int error; /* error value */
xfs_inode_t *ip; /* bitmap file inode */
xfs_mount_t *mp; /* file system mount structure */
xfs_fsblock_t sb; /* summary file block number */
xfs_buf_t *sumbp; /* summary file block buffer */
@ -2163,10 +2152,9 @@ xfs_rtfree_extent(
/*
* Synchronize by locking the bitmap inode.
*/
error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0,
XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP, &ip);
if (error)
return error;
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_trans_ijoin_ref(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
#if defined(__KERNEL__) && defined(DEBUG)
/*
* Check to see that this whole range is currently allocated.
@ -2199,10 +2187,10 @@ xfs_rtfree_extent(
*/
if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
mp->m_sb.sb_rextents) {
if (!(ip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
ip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
*(__uint64_t *)&ip->i_d.di_atime = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
*(__uint64_t *)&mp->m_rbmip->i_d.di_atime = 0;
xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
}
return 0;
}