From: Christoph Hellwig Date: Mon, 6 Sep 2010 01:44:45 +0000 (+0000) Subject: xfs: stop using xfs_qm_dqtobp in xfs_qm_dqflush X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=acecf1b5d8a846bf818bf74df454330f0b444b0a;p=linux-beck.git xfs: stop using xfs_qm_dqtobp in xfs_qm_dqflush In xfs_qm_dqflush we know that q_blkno must be initialized already from a previous xfs_qm_dqread. So instead of calling xfs_qm_dqtobp we can simply read the quota buffer directly. This also saves us from a duplicate xfs_qm_dqcheck call check and allows xfs_qm_dqtobp to be simplified now that it is always called for a newly initialized inode. In addition to that properly unwind all locks in xfs_qm_dqflush when xfs_qm_dqcheck fails. This mirrors a similar cleanup in the inode lookup done earlier. Signed-off-by: Christoph Hellwig Signed-off-by: Alex Elder --- diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c index e1a2f6800e01..faf8e1a83a12 100644 --- a/fs/xfs/quota/xfs_dquot.c +++ b/fs/xfs/quota/xfs_dquot.c @@ -463,87 +463,68 @@ xfs_qm_dqtobp( uint flags) { xfs_bmbt_irec_t map; - int nmaps, error; + int nmaps = 1, error; xfs_buf_t *bp; - xfs_inode_t *quotip; - xfs_mount_t *mp; + xfs_inode_t *quotip = XFS_DQ_TO_QIP(dqp); + xfs_mount_t *mp = dqp->q_mount; xfs_disk_dquot_t *ddq; - xfs_dqid_t id; - boolean_t newdquot; + xfs_dqid_t id = be32_to_cpu(dqp->q_core.d_id); xfs_trans_t *tp = (tpp ? *tpp : NULL); - mp = dqp->q_mount; - id = be32_to_cpu(dqp->q_core.d_id); - nmaps = 1; - newdquot = B_FALSE; + dqp->q_fileoffset = (xfs_fileoff_t)id / mp->m_quotainfo->qi_dqperchunk; - /* - * If we don't know where the dquot lives, find out. - */ - if (dqp->q_blkno == (xfs_daddr_t) 0) { - /* We use the id as an index */ - dqp->q_fileoffset = (xfs_fileoff_t)id / - mp->m_quotainfo->qi_dqperchunk; - nmaps = 1; - quotip = XFS_DQ_TO_QIP(dqp); - xfs_ilock(quotip, XFS_ILOCK_SHARED); + xfs_ilock(quotip, XFS_ILOCK_SHARED); + if (XFS_IS_THIS_QUOTA_OFF(dqp)) { /* - * Return if this type of quotas is turned off while we didn't - * have an inode lock + * Return if this type of quotas is turned off while we + * didn't have the quota inode lock. */ - if (XFS_IS_THIS_QUOTA_OFF(dqp)) { - xfs_iunlock(quotip, XFS_ILOCK_SHARED); - return (ESRCH); - } + xfs_iunlock(quotip, XFS_ILOCK_SHARED); + return ESRCH; + } + + /* + * Find the block map; no allocations yet + */ + error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset, + XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA, + NULL, 0, &map, &nmaps, NULL); + + xfs_iunlock(quotip, XFS_ILOCK_SHARED); + if (error) + return error; + + ASSERT(nmaps == 1); + ASSERT(map.br_blockcount == 1); + + /* + * Offset of dquot in the (fixed sized) dquot chunk. + */ + dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * + sizeof(xfs_dqblk_t); + + ASSERT(map.br_startblock != DELAYSTARTBLOCK); + if (map.br_startblock == HOLESTARTBLOCK) { /* - * Find the block map; no allocations yet + * We don't allocate unless we're asked to */ - error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset, - XFS_DQUOT_CLUSTER_SIZE_FSB, - XFS_BMAPI_METADATA, - NULL, 0, &map, &nmaps, NULL); + if (!(flags & XFS_QMOPT_DQALLOC)) + return ENOENT; - xfs_iunlock(quotip, XFS_ILOCK_SHARED); + ASSERT(tp); + error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, + dqp->q_fileoffset, &bp); if (error) - return (error); - ASSERT(nmaps == 1); - ASSERT(map.br_blockcount == 1); + return error; + tp = *tpp; + } else { + trace_xfs_dqtobp_read(dqp); /* - * offset of dquot in the (fixed sized) dquot chunk. + * store the blkno etc so that we don't have to do the + * mapping all the time */ - dqp->q_bufoffset = (id % mp->m_quotainfo->qi_dqperchunk) * - sizeof(xfs_dqblk_t); - if (map.br_startblock == HOLESTARTBLOCK) { - /* - * We don't allocate unless we're asked to - */ - if (!(flags & XFS_QMOPT_DQALLOC)) - return (ENOENT); - - ASSERT(tp); - if ((error = xfs_qm_dqalloc(tpp, mp, dqp, quotip, - dqp->q_fileoffset, &bp))) - return (error); - tp = *tpp; - newdquot = B_TRUE; - } else { - /* - * store the blkno etc so that we don't have to do the - * mapping all the time - */ - dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); - } - } - ASSERT(dqp->q_blkno != DELAYSTARTBLOCK); - ASSERT(dqp->q_blkno != HOLESTARTBLOCK); - - /* - * Read in the buffer, unless we've just done the allocation - * (in which case we already have the buf). - */ - if (!newdquot) { - trace_xfs_dqtobp_read(dqp); + dqp->q_blkno = XFS_FSB_TO_DADDR(mp, map.br_startblock); error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, dqp->q_blkno, @@ -552,13 +533,14 @@ xfs_qm_dqtobp( if (error || !bp) return XFS_ERROR(error); } + ASSERT(XFS_BUF_ISBUSY(bp)); ASSERT(XFS_BUF_VALUSEMA(bp) <= 0); /* * calculate the location of the dquot inside the buffer. */ - ddq = (xfs_disk_dquot_t *)((char *)XFS_BUF_PTR(bp) + dqp->q_bufoffset); + ddq = (struct xfs_disk_dquot *)(XFS_BUF_PTR(bp) + dqp->q_bufoffset); /* * A simple sanity check in case we got a corrupted dquot... @@ -1176,18 +1158,18 @@ xfs_qm_dqflush( xfs_dquot_t *dqp, uint flags) { - xfs_mount_t *mp; - xfs_buf_t *bp; - xfs_disk_dquot_t *ddqp; + struct xfs_mount *mp = dqp->q_mount; + struct xfs_buf *bp; + struct xfs_disk_dquot *ddqp; int error; ASSERT(XFS_DQ_IS_LOCKED(dqp)); ASSERT(!completion_done(&dqp->q_flush)); + trace_xfs_dqflush(dqp); /* - * If not dirty, or it's pinned and we are not supposed to - * block, nada. + * If not dirty, or it's pinned and we are not supposed to block, nada. */ if (!XFS_DQ_IS_DIRTY(dqp) || (!(flags & SYNC_WAIT) && atomic_read(&dqp->q_pincount) > 0)) { @@ -1201,40 +1183,46 @@ xfs_qm_dqflush( * down forcibly. If that's the case we must not write this dquot * to disk, because the log record didn't make it to disk! */ - if (XFS_FORCED_SHUTDOWN(dqp->q_mount)) { - dqp->dq_flags &= ~(XFS_DQ_DIRTY); + if (XFS_FORCED_SHUTDOWN(mp)) { + dqp->dq_flags &= ~XFS_DQ_DIRTY; xfs_dqfunlock(dqp); return XFS_ERROR(EIO); } /* * Get the buffer containing the on-disk dquot - * We don't need a transaction envelope because we know that the - * the ondisk-dquot has already been allocated for. */ - if ((error = xfs_qm_dqtobp(NULL, dqp, &ddqp, &bp, XFS_QMOPT_DOWARN))) { + error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp, dqp->q_blkno, + mp->m_quotainfo->qi_dqchunklen, 0, &bp); + if (error) { ASSERT(error != ENOENT); - /* - * Quotas could have gotten turned off (ESRCH) - */ xfs_dqfunlock(dqp); - return (error); + return error; } - if (xfs_qm_dqcheck(&dqp->q_core, be32_to_cpu(ddqp->d_id), - 0, XFS_QMOPT_DOWARN, "dqflush (incore copy)")) { - xfs_force_shutdown(dqp->q_mount, SHUTDOWN_CORRUPT_INCORE); + /* + * Calculate the location of the dquot inside the buffer. + */ + ddqp = (struct xfs_disk_dquot *)(XFS_BUF_PTR(bp) + dqp->q_bufoffset); + + /* + * A simple sanity check in case we got a corrupted dquot.. + */ + if (xfs_qm_dqcheck(&dqp->q_core, be32_to_cpu(ddqp->d_id), 0, + XFS_QMOPT_DOWARN, "dqflush (incore copy)")) { + xfs_buf_relse(bp); + xfs_dqfunlock(dqp); + xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); return XFS_ERROR(EIO); } /* This is the only portion of data that needs to persist */ - memcpy(ddqp, &(dqp->q_core), sizeof(xfs_disk_dquot_t)); + memcpy(ddqp, &dqp->q_core, sizeof(xfs_disk_dquot_t)); /* * Clear the dirty field and remember the flush lsn for later use. */ - dqp->dq_flags &= ~(XFS_DQ_DIRTY); - mp = dqp->q_mount; + dqp->dq_flags &= ~XFS_DQ_DIRTY; xfs_trans_ail_copy_lsn(mp->m_ail, &dqp->q_logitem.qli_flush_lsn, &dqp->q_logitem.qli_item.li_lsn);