diff options
Diffstat (limited to 'fs/xfs/xfs_ialloc.c')
-rw-r--r-- | fs/xfs/xfs_ialloc.c | 83 |
1 files changed, 58 insertions, 25 deletions
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c index c5c4ef4f2bdb..a815412eab80 100644 --- a/fs/xfs/xfs_ialloc.c +++ b/fs/xfs/xfs_ialloc.c @@ -200,7 +200,8 @@ xfs_ialloc_inode_init( */ d = XFS_AGB_TO_DADDR(mp, agno, agbno + (j * blks_per_cluster)); fbuf = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, - mp->m_bsize * blks_per_cluster, 0); + mp->m_bsize * blks_per_cluster, + XBF_UNMAPPED); if (!fbuf) return ENOMEM; /* @@ -210,6 +211,7 @@ xfs_ialloc_inode_init( * to log a whole cluster of inodes instead of all the * individual transactions causing a lot of log traffic. */ + fbuf->b_ops = &xfs_inode_buf_ops; xfs_buf_zero(fbuf, 0, ninodes << mp->m_sb.sb_inodelog); for (i = 0; i < ninodes; i++) { int ioffset = i << mp->m_sb.sb_inodelog; @@ -877,9 +879,9 @@ error0: * This function is designed to be called twice if it has to do an allocation * to make more free inodes. On the first call, *IO_agbp should be set to NULL. * If an inode is available without having to performn an allocation, an inode - * number is returned. In this case, *IO_agbp would be NULL. If an allocation - * needes to be done, xfs_dialloc would return the current AGI buffer in - * *IO_agbp. The caller should then commit the current transaction, allocate a + * number is returned. In this case, *IO_agbp is set to NULL. If an allocation + * needs to be done, xfs_dialloc returns the current AGI buffer in *IO_agbp. + * The caller should then commit the current transaction, allocate a * new transaction, and call xfs_dialloc() again, passing in the previous value * of *IO_agbp. IO_agbp should be held across the transactions. Since the AGI * buffer is locked across the two calls, the second call is guaranteed to have @@ -1472,6 +1474,57 @@ xfs_check_agi_unlinked( #define xfs_check_agi_unlinked(agi) #endif +static void +xfs_agi_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_target->bt_mount; + struct xfs_agi *agi = XFS_BUF_TO_AGI(bp); + int agi_ok; + + /* + * Validate the magic number of the agi block. + */ + agi_ok = agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC) && + XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)); + + /* + * during growfs operations, the perag is not fully initialised, + * so we can't use it for any useful checking. growfs ensures we can't + * use it by using uncached buffers that don't have the perag attached + * so we can detect and avoid this problem. + */ + if (bp->b_pag) + agi_ok = agi_ok && be32_to_cpu(agi->agi_seqno) == + bp->b_pag->pag_agno; + + if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI, + XFS_RANDOM_IALLOC_READ_AGI))) { + XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, agi); + xfs_buf_ioerror(bp, EFSCORRUPTED); + } + xfs_check_agi_unlinked(agi); +} + +static void +xfs_agi_read_verify( + struct xfs_buf *bp) +{ + xfs_agi_verify(bp); +} + +static void +xfs_agi_write_verify( + struct xfs_buf *bp) +{ + xfs_agi_verify(bp); +} + +const struct xfs_buf_ops xfs_agi_buf_ops = { + .verify_read = xfs_agi_read_verify, + .verify_write = xfs_agi_write_verify, +}; + /* * Read in the allocation group header (inode allocation section) */ @@ -1482,38 +1535,18 @@ xfs_read_agi( xfs_agnumber_t agno, /* allocation group number */ struct xfs_buf **bpp) /* allocation group hdr buf */ { - struct xfs_agi *agi; /* allocation group header */ - int agi_ok; /* agi is consistent */ int error; ASSERT(agno != NULLAGNUMBER); error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)), - XFS_FSS_TO_BB(mp, 1), 0, bpp); + XFS_FSS_TO_BB(mp, 1), 0, bpp, &xfs_agi_buf_ops); if (error) return error; ASSERT(!xfs_buf_geterror(*bpp)); - agi = XFS_BUF_TO_AGI(*bpp); - - /* - * Validate the magic number of the agi block. - */ - agi_ok = agi->agi_magicnum == cpu_to_be32(XFS_AGI_MAGIC) && - XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)) && - be32_to_cpu(agi->agi_seqno) == agno; - if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI, - XFS_RANDOM_IALLOC_READ_AGI))) { - XFS_CORRUPTION_ERROR("xfs_read_agi", XFS_ERRLEVEL_LOW, - mp, agi); - xfs_trans_brelse(tp, *bpp); - return XFS_ERROR(EFSCORRUPTED); - } - xfs_buf_set_ref(*bpp, XFS_AGI_REF); - - xfs_check_agi_unlinked(agi); return 0; } |