| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * Copyright (c) 2013 Red Hat, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_mount.h" |
| #include "xfs_inode.h" |
| #include "xfs_quota.h" |
| #include "xfs_trans.h" |
| #include "xfs_qm.h" |
| #include "xfs_error.h" |
| #include "xfs_cksum.h" |
| #include "xfs_trace.h" |
| |
| int |
| xfs_calc_dquots_per_chunk( |
| unsigned int nbblks) /* basic block units */ |
| { |
| ASSERT(nbblks > 0); |
| return BBTOB(nbblks) / sizeof(xfs_dqblk_t); |
| } |
| |
| /* |
| * Do some primitive error checking on ondisk dquot data structures. |
| * |
| * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure; |
| * we verify them separately because at some points we have only the |
| * smaller xfs_disk_dquot structure available. |
| */ |
| |
| xfs_failaddr_t |
| xfs_dquot_verify( |
| struct xfs_mount *mp, |
| xfs_disk_dquot_t *ddq, |
| xfs_dqid_t id, |
| uint type) /* used only during quotacheck */ |
| { |
| /* |
| * We can encounter an uninitialized dquot buffer for 2 reasons: |
| * 1. If we crash while deleting the quotainode(s), and those blks got |
| * used for user data. This is because we take the path of regular |
| * file deletion; however, the size field of quotainodes is never |
| * updated, so all the tricks that we play in itruncate_finish |
| * don't quite matter. |
| * |
| * 2. We don't play the quota buffers when there's a quotaoff logitem. |
| * But the allocation will be replayed so we'll end up with an |
| * uninitialized quota block. |
| * |
| * This is all fine; things are still consistent, and we haven't lost |
| * any quota information. Just don't complain about bad dquot blks. |
| */ |
| if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) |
| return __this_address; |
| if (ddq->d_version != XFS_DQUOT_VERSION) |
| return __this_address; |
| |
| if (type && ddq->d_flags != type) |
| return __this_address; |
| if (ddq->d_flags != XFS_DQ_USER && |
| ddq->d_flags != XFS_DQ_PROJ && |
| ddq->d_flags != XFS_DQ_GROUP) |
| return __this_address; |
| |
| if (id != -1 && id != be32_to_cpu(ddq->d_id)) |
| return __this_address; |
| |
| if (!ddq->d_id) |
| return NULL; |
| |
| if (ddq->d_blk_softlimit && |
| be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) && |
| !ddq->d_btimer) |
| return __this_address; |
| |
| if (ddq->d_ino_softlimit && |
| be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) && |
| !ddq->d_itimer) |
| return __this_address; |
| |
| if (ddq->d_rtb_softlimit && |
| be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) && |
| !ddq->d_rtbtimer) |
| return __this_address; |
| |
| return NULL; |
| } |
| |
| xfs_failaddr_t |
| xfs_dqblk_verify( |
| struct xfs_mount *mp, |
| struct xfs_dqblk *dqb, |
| xfs_dqid_t id, |
| uint type) /* used only during quotacheck */ |
| { |
| if (xfs_sb_version_hascrc(&mp->m_sb) && |
| !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid)) |
| return __this_address; |
| |
| return xfs_dquot_verify(mp, &dqb->dd_diskdq, id, type); |
| } |
| |
| /* |
| * Do some primitive error checking on ondisk dquot data structures. |
| */ |
| int |
| xfs_dqblk_repair( |
| struct xfs_mount *mp, |
| struct xfs_dqblk *dqb, |
| xfs_dqid_t id, |
| uint type) |
| { |
| /* |
| * Typically, a repair is only requested by quotacheck. |
| */ |
| ASSERT(id != -1); |
| memset(dqb, 0, sizeof(xfs_dqblk_t)); |
| |
| dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); |
| dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION; |
| dqb->dd_diskdq.d_flags = type; |
| dqb->dd_diskdq.d_id = cpu_to_be32(id); |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid); |
| xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk), |
| XFS_DQUOT_CRC_OFF); |
| } |
| |
| return 0; |
| } |
| |
| STATIC bool |
| xfs_dquot_buf_verify_crc( |
| struct xfs_mount *mp, |
| struct xfs_buf *bp, |
| bool readahead) |
| { |
| struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; |
| int ndquots; |
| int i; |
| |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return true; |
| |
| /* |
| * if we are in log recovery, the quota subsystem has not been |
| * initialised so we have no quotainfo structure. In that case, we need |
| * to manually calculate the number of dquots in the buffer. |
| */ |
| if (mp->m_quotainfo) |
| ndquots = mp->m_quotainfo->qi_dqperchunk; |
| else |
| ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
| |
| for (i = 0; i < ndquots; i++, d++) { |
| if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), |
| XFS_DQUOT_CRC_OFF)) { |
| if (!readahead) |
| xfs_buf_verifier_error(bp, -EFSBADCRC, __func__, |
| d, sizeof(*d), __this_address); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| STATIC xfs_failaddr_t |
| xfs_dquot_buf_verify( |
| struct xfs_mount *mp, |
| struct xfs_buf *bp, |
| bool readahead) |
| { |
| struct xfs_dqblk *dqb = bp->b_addr; |
| xfs_failaddr_t fa; |
| xfs_dqid_t id = 0; |
| int ndquots; |
| int i; |
| |
| /* |
| * if we are in log recovery, the quota subsystem has not been |
| * initialised so we have no quotainfo structure. In that case, we need |
| * to manually calculate the number of dquots in the buffer. |
| */ |
| if (mp->m_quotainfo) |
| ndquots = mp->m_quotainfo->qi_dqperchunk; |
| else |
| ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
| |
| /* |
| * On the first read of the buffer, verify that each dquot is valid. |
| * We don't know what the id of the dquot is supposed to be, just that |
| * they should be increasing monotonically within the buffer. If the |
| * first id is corrupt, then it will fail on the second dquot in the |
| * buffer so corruptions could point to the wrong dquot in this case. |
| */ |
| for (i = 0; i < ndquots; i++) { |
| struct xfs_disk_dquot *ddq; |
| |
| ddq = &dqb[i].dd_diskdq; |
| |
| if (i == 0) |
| id = be32_to_cpu(ddq->d_id); |
| |
| fa = xfs_dqblk_verify(mp, &dqb[i], id + i, 0); |
| if (fa) { |
| if (!readahead) |
| xfs_buf_verifier_error(bp, -EFSCORRUPTED, |
| __func__, &dqb[i], |
| sizeof(struct xfs_dqblk), fa); |
| return fa; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static xfs_failaddr_t |
| xfs_dquot_buf_verify_struct( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| return xfs_dquot_buf_verify(mp, bp, false); |
| } |
| |
| static void |
| xfs_dquot_buf_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| if (!xfs_dquot_buf_verify_crc(mp, bp, false)) |
| return; |
| xfs_dquot_buf_verify(mp, bp, false); |
| } |
| |
| /* |
| * readahead errors are silent and simply leave the buffer as !done so a real |
| * read will then be run with the xfs_dquot_buf_ops verifier. See |
| * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than |
| * reporting the failure. |
| */ |
| static void |
| xfs_dquot_buf_readahead_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| if (!xfs_dquot_buf_verify_crc(mp, bp, true) || |
| xfs_dquot_buf_verify(mp, bp, true) != NULL) { |
| xfs_buf_ioerror(bp, -EIO); |
| bp->b_flags &= ~XBF_DONE; |
| } |
| } |
| |
| /* |
| * we don't calculate the CRC here as that is done when the dquot is flushed to |
| * the buffer after the update is done. This ensures that the dquot in the |
| * buffer always has an up-to-date CRC value. |
| */ |
| static void |
| xfs_dquot_buf_write_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| |
| xfs_dquot_buf_verify(mp, bp, false); |
| } |
| |
| const struct xfs_buf_ops xfs_dquot_buf_ops = { |
| .name = "xfs_dquot", |
| .verify_read = xfs_dquot_buf_read_verify, |
| .verify_write = xfs_dquot_buf_write_verify, |
| .verify_struct = xfs_dquot_buf_verify_struct, |
| }; |
| |
| const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { |
| .name = "xfs_dquot_ra", |
| .verify_read = xfs_dquot_buf_readahead_verify, |
| .verify_write = xfs_dquot_buf_write_verify, |
| }; |