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325 lines
8.0 KiB
325 lines
8.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2000-2006 Silicon Graphics, Inc. |
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* Copyright (c) 2013 Red Hat, Inc. |
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* All Rights Reserved. |
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*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.h" |
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#include "xfs_format.h" |
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#include "xfs_log_format.h" |
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#include "xfs_trans_resv.h" |
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#include "xfs_mount.h" |
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#include "xfs_inode.h" |
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#include "xfs_quota.h" |
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#include "xfs_trans.h" |
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#include "xfs_qm.h" |
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#include "xfs_error.h" |
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int |
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xfs_calc_dquots_per_chunk( |
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unsigned int nbblks) /* basic block units */ |
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{ |
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ASSERT(nbblks > 0); |
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return BBTOB(nbblks) / sizeof(xfs_dqblk_t); |
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} |
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/* |
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* Do some primitive error checking on ondisk dquot data structures. |
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* |
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* The xfs_dqblk structure /contains/ the xfs_disk_dquot structure; |
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* we verify them separately because at some points we have only the |
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* smaller xfs_disk_dquot structure available. |
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*/ |
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xfs_failaddr_t |
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xfs_dquot_verify( |
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struct xfs_mount *mp, |
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struct xfs_disk_dquot *ddq, |
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xfs_dqid_t id) /* used only during quotacheck */ |
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{ |
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__u8 ddq_type; |
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|
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/* |
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* We can encounter an uninitialized dquot buffer for 2 reasons: |
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* 1. If we crash while deleting the quotainode(s), and those blks got |
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* used for user data. This is because we take the path of regular |
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* file deletion; however, the size field of quotainodes is never |
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* updated, so all the tricks that we play in itruncate_finish |
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* don't quite matter. |
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* |
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* 2. We don't play the quota buffers when there's a quotaoff logitem. |
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* But the allocation will be replayed so we'll end up with an |
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* uninitialized quota block. |
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* |
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* This is all fine; things are still consistent, and we haven't lost |
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* any quota information. Just don't complain about bad dquot blks. |
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*/ |
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if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC)) |
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return __this_address; |
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if (ddq->d_version != XFS_DQUOT_VERSION) |
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return __this_address; |
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if (ddq->d_type & ~XFS_DQTYPE_ANY) |
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return __this_address; |
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ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK; |
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if (ddq_type != XFS_DQTYPE_USER && |
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ddq_type != XFS_DQTYPE_PROJ && |
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ddq_type != XFS_DQTYPE_GROUP) |
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return __this_address; |
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if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && |
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!xfs_has_bigtime(mp)) |
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return __this_address; |
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if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id) |
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return __this_address; |
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if (id != -1 && id != be32_to_cpu(ddq->d_id)) |
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return __this_address; |
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if (!ddq->d_id) |
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return NULL; |
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if (ddq->d_blk_softlimit && |
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be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) && |
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!ddq->d_btimer) |
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return __this_address; |
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if (ddq->d_ino_softlimit && |
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be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) && |
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!ddq->d_itimer) |
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return __this_address; |
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if (ddq->d_rtb_softlimit && |
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be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) && |
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!ddq->d_rtbtimer) |
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return __this_address; |
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return NULL; |
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} |
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xfs_failaddr_t |
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xfs_dqblk_verify( |
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struct xfs_mount *mp, |
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struct xfs_dqblk *dqb, |
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xfs_dqid_t id) /* used only during quotacheck */ |
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{ |
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if (xfs_has_crc(mp) && |
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!uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid)) |
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return __this_address; |
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return xfs_dquot_verify(mp, &dqb->dd_diskdq, id); |
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} |
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/* |
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* Do some primitive error checking on ondisk dquot data structures. |
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*/ |
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void |
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xfs_dqblk_repair( |
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struct xfs_mount *mp, |
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struct xfs_dqblk *dqb, |
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xfs_dqid_t id, |
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xfs_dqtype_t type) |
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{ |
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/* |
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* Typically, a repair is only requested by quotacheck. |
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*/ |
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ASSERT(id != -1); |
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memset(dqb, 0, sizeof(xfs_dqblk_t)); |
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dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC); |
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dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION; |
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dqb->dd_diskdq.d_type = type; |
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dqb->dd_diskdq.d_id = cpu_to_be32(id); |
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if (xfs_has_crc(mp)) { |
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uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid); |
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xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk), |
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XFS_DQUOT_CRC_OFF); |
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} |
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} |
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STATIC bool |
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xfs_dquot_buf_verify_crc( |
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struct xfs_mount *mp, |
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struct xfs_buf *bp, |
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bool readahead) |
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{ |
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struct xfs_dqblk *d = (struct xfs_dqblk *)bp->b_addr; |
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int ndquots; |
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int i; |
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if (!xfs_has_crc(mp)) |
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return true; |
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/* |
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* if we are in log recovery, the quota subsystem has not been |
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* initialised so we have no quotainfo structure. In that case, we need |
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* to manually calculate the number of dquots in the buffer. |
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*/ |
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if (mp->m_quotainfo) |
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ndquots = mp->m_quotainfo->qi_dqperchunk; |
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else |
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
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for (i = 0; i < ndquots; i++, d++) { |
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if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk), |
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XFS_DQUOT_CRC_OFF)) { |
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if (!readahead) |
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xfs_buf_verifier_error(bp, -EFSBADCRC, __func__, |
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d, sizeof(*d), __this_address); |
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return false; |
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} |
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} |
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return true; |
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} |
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STATIC xfs_failaddr_t |
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xfs_dquot_buf_verify( |
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struct xfs_mount *mp, |
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struct xfs_buf *bp, |
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bool readahead) |
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{ |
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struct xfs_dqblk *dqb = bp->b_addr; |
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xfs_failaddr_t fa; |
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xfs_dqid_t id = 0; |
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int ndquots; |
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int i; |
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/* |
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* if we are in log recovery, the quota subsystem has not been |
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* initialised so we have no quotainfo structure. In that case, we need |
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* to manually calculate the number of dquots in the buffer. |
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*/ |
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if (mp->m_quotainfo) |
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ndquots = mp->m_quotainfo->qi_dqperchunk; |
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else |
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ndquots = xfs_calc_dquots_per_chunk(bp->b_length); |
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/* |
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* On the first read of the buffer, verify that each dquot is valid. |
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* We don't know what the id of the dquot is supposed to be, just that |
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* they should be increasing monotonically within the buffer. If the |
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* first id is corrupt, then it will fail on the second dquot in the |
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* buffer so corruptions could point to the wrong dquot in this case. |
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*/ |
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for (i = 0; i < ndquots; i++) { |
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struct xfs_disk_dquot *ddq; |
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ddq = &dqb[i].dd_diskdq; |
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if (i == 0) |
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id = be32_to_cpu(ddq->d_id); |
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fa = xfs_dqblk_verify(mp, &dqb[i], id + i); |
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if (fa) { |
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if (!readahead) |
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xfs_buf_verifier_error(bp, -EFSCORRUPTED, |
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__func__, &dqb[i], |
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sizeof(struct xfs_dqblk), fa); |
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return fa; |
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} |
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} |
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return NULL; |
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} |
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static xfs_failaddr_t |
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xfs_dquot_buf_verify_struct( |
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struct xfs_buf *bp) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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return xfs_dquot_buf_verify(mp, bp, false); |
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} |
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static void |
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xfs_dquot_buf_read_verify( |
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struct xfs_buf *bp) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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if (!xfs_dquot_buf_verify_crc(mp, bp, false)) |
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return; |
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xfs_dquot_buf_verify(mp, bp, false); |
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} |
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/* |
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* readahead errors are silent and simply leave the buffer as !done so a real |
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* read will then be run with the xfs_dquot_buf_ops verifier. See |
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* xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than |
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* reporting the failure. |
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*/ |
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static void |
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xfs_dquot_buf_readahead_verify( |
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struct xfs_buf *bp) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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if (!xfs_dquot_buf_verify_crc(mp, bp, true) || |
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xfs_dquot_buf_verify(mp, bp, true) != NULL) { |
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xfs_buf_ioerror(bp, -EIO); |
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bp->b_flags &= ~XBF_DONE; |
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} |
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} |
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/* |
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* we don't calculate the CRC here as that is done when the dquot is flushed to |
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* the buffer after the update is done. This ensures that the dquot in the |
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* buffer always has an up-to-date CRC value. |
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*/ |
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static void |
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xfs_dquot_buf_write_verify( |
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struct xfs_buf *bp) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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xfs_dquot_buf_verify(mp, bp, false); |
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} |
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const struct xfs_buf_ops xfs_dquot_buf_ops = { |
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.name = "xfs_dquot", |
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.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC), |
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cpu_to_be16(XFS_DQUOT_MAGIC) }, |
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.verify_read = xfs_dquot_buf_read_verify, |
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.verify_write = xfs_dquot_buf_write_verify, |
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.verify_struct = xfs_dquot_buf_verify_struct, |
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}; |
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const struct xfs_buf_ops xfs_dquot_buf_ra_ops = { |
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.name = "xfs_dquot_ra", |
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.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC), |
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cpu_to_be16(XFS_DQUOT_MAGIC) }, |
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.verify_read = xfs_dquot_buf_readahead_verify, |
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.verify_write = xfs_dquot_buf_write_verify, |
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}; |
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/* Convert an on-disk timer value into an incore timer value. */ |
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time64_t |
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xfs_dquot_from_disk_ts( |
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struct xfs_disk_dquot *ddq, |
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__be32 dtimer) |
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{ |
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uint32_t t = be32_to_cpu(dtimer); |
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if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME)) |
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return xfs_dq_bigtime_to_unix(t); |
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return t; |
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} |
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/* Convert an incore timer value into an on-disk timer value. */ |
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__be32 |
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xfs_dquot_to_disk_ts( |
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struct xfs_dquot *dqp, |
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time64_t timer) |
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{ |
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uint32_t t = timer; |
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if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME)) |
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t = xfs_dq_unix_to_bigtime(timer); |
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return cpu_to_be32(t); |
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}
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