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7d6a13f023
When we do dquot readahead in log recovery, we do not use a verifier
as the underlying buffer may not have dquots in it. e.g. the
allocation operation hasn't yet been replayed. Hence we do not want
to fail recovery because we detect an operation to be replayed has
not been run yet. This problem was addressed for inodes in commit
d891400 ("xfs: inode buffers may not be valid during recovery
readahead") but the problem was not recognised to exist for dquots
and their buffers as the dquot readahead did not have a verifier.
The result of not using a verifier is that when the buffer is then
next read to replay a dquot modification, the dquot buffer verifier
will only be attached to the buffer if *readahead is not complete*.
Hence we can read the buffer, replay the dquot changes and then add
it to the delwri submission list without it having a verifier
attached to it. This then generates warnings in xfs_buf_ioapply(),
which catches and warns about this case.
Fix this and make it handle the same readahead verifier error cases
as for inode buffers by adding a new readahead verifier that has a
write operation as well as a read operation that marks the buffer as
not done if any corruption is detected. Also make sure we don't run
readahead if the dquot buffer has been marked as cancelled by
recovery.
This will result in readahead either succeeding and the buffer
having a valid write verifier, or readahead failing and the buffer
state requiring the subsequent read to resubmit the IO with the new
verifier. In either case, this will result in the buffer always
ending up with a valid write verifier on it.
Note: we also need to fix the inode buffer readahead error handling
to mark the buffer with EIO. Brian noticed the code I copied from
there wrong during review, so fix it at the same time. Add comments
linking the two functions that handle readahead verifier errors
together so we don't forget this behavioural link in future.
cc: <stable@vger.kernel.org> # 3.12 - current
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
160 lines
6.4 KiB
C
160 lines
6.4 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_QUOTA_DEFS_H__
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#define __XFS_QUOTA_DEFS_H__
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/*
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* Quota definitions shared between user and kernel source trees.
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*/
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/*
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* Even though users may not have quota limits occupying all 64-bits,
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* they may need 64-bit accounting. Hence, 64-bit quota-counters,
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* and quota-limits. This is a waste in the common case, but hey ...
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*/
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typedef __uint64_t xfs_qcnt_t;
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typedef __uint16_t xfs_qwarncnt_t;
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/*
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* flags for q_flags field in the dquot.
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*/
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#define XFS_DQ_USER 0x0001 /* a user quota */
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#define XFS_DQ_PROJ 0x0002 /* project quota */
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#define XFS_DQ_GROUP 0x0004 /* a group quota */
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#define XFS_DQ_DIRTY 0x0008 /* dquot is dirty */
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#define XFS_DQ_FREEING 0x0010 /* dquot is beeing torn down */
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#define XFS_DQ_ALLTYPES (XFS_DQ_USER|XFS_DQ_PROJ|XFS_DQ_GROUP)
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#define XFS_DQ_FLAGS \
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{ XFS_DQ_USER, "USER" }, \
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{ XFS_DQ_PROJ, "PROJ" }, \
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{ XFS_DQ_GROUP, "GROUP" }, \
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{ XFS_DQ_DIRTY, "DIRTY" }, \
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{ XFS_DQ_FREEING, "FREEING" }
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/*
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* We have the possibility of all three quota types being active at once, and
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* hence free space modification requires modification of all three current
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* dquots in a single transaction. For this case we need to have a reservation
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* of at least 3 dquots.
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*
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* However, a chmod operation can change both UID and GID in a single
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* transaction, resulting in requiring {old, new} x {uid, gid} dquots to be
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* modified. Hence for this case we need to reserve space for at least 4 dquots.
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*
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* And in the worst case, there's a rename operation that can be modifying up to
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* 4 inodes with dquots attached to them. In reality, the only inodes that can
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* have their dquots modified are the source and destination directory inodes
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* due to directory name creation and removal. That can require space allocation
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* and/or freeing on both directory inodes, and hence all three dquots on each
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* inode can be modified. And if the directories are world writeable, all the
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* dquots can be unique and so 6 dquots can be modified....
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*
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* And, of course, we also need to take into account the dquot log format item
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* used to describe each dquot.
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*/
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#define XFS_DQUOT_LOGRES(mp) \
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((sizeof(struct xfs_dq_logformat) + sizeof(struct xfs_disk_dquot)) * 6)
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#define XFS_IS_QUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_ALL_QUOTA_ACCT)
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#define XFS_IS_UQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_UQUOTA_ACCT)
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#define XFS_IS_PQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_PQUOTA_ACCT)
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#define XFS_IS_GQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_GQUOTA_ACCT)
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#define XFS_IS_UQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_UQUOTA_ENFD)
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#define XFS_IS_GQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_GQUOTA_ENFD)
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#define XFS_IS_PQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_PQUOTA_ENFD)
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/*
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* Incore only flags for quotaoff - these bits get cleared when quota(s)
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* are in the process of getting turned off. These flags are in m_qflags but
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* never in sb_qflags.
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*/
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#define XFS_UQUOTA_ACTIVE 0x1000 /* uquotas are being turned off */
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#define XFS_GQUOTA_ACTIVE 0x2000 /* gquotas are being turned off */
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#define XFS_PQUOTA_ACTIVE 0x4000 /* pquotas are being turned off */
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#define XFS_ALL_QUOTA_ACTIVE \
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(XFS_UQUOTA_ACTIVE | XFS_GQUOTA_ACTIVE | XFS_PQUOTA_ACTIVE)
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/*
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* Checking XFS_IS_*QUOTA_ON() while holding any inode lock guarantees
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* quota will be not be switched off as long as that inode lock is held.
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*/
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#define XFS_IS_QUOTA_ON(mp) ((mp)->m_qflags & (XFS_UQUOTA_ACTIVE | \
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XFS_GQUOTA_ACTIVE | \
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XFS_PQUOTA_ACTIVE))
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#define XFS_IS_UQUOTA_ON(mp) ((mp)->m_qflags & XFS_UQUOTA_ACTIVE)
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#define XFS_IS_GQUOTA_ON(mp) ((mp)->m_qflags & XFS_GQUOTA_ACTIVE)
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#define XFS_IS_PQUOTA_ON(mp) ((mp)->m_qflags & XFS_PQUOTA_ACTIVE)
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/*
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* Flags to tell various functions what to do. Not all of these are meaningful
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* to a single function. None of these XFS_QMOPT_* flags are meant to have
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* persistent values (ie. their values can and will change between versions)
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*/
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#define XFS_QMOPT_DQALLOC 0x0000002 /* alloc dquot ondisk if needed */
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#define XFS_QMOPT_UQUOTA 0x0000004 /* user dquot requested */
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#define XFS_QMOPT_PQUOTA 0x0000008 /* project dquot requested */
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#define XFS_QMOPT_FORCE_RES 0x0000010 /* ignore quota limits */
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#define XFS_QMOPT_SBVERSION 0x0000040 /* change superblock version num */
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#define XFS_QMOPT_DOWARN 0x0000400 /* increase warning cnt if needed */
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#define XFS_QMOPT_DQREPAIR 0x0001000 /* repair dquot if damaged */
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#define XFS_QMOPT_GQUOTA 0x0002000 /* group dquot requested */
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#define XFS_QMOPT_ENOSPC 0x0004000 /* enospc instead of edquot (prj) */
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/*
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* flags to xfs_trans_mod_dquot to indicate which field needs to be
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* modified.
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*/
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#define XFS_QMOPT_RES_REGBLKS 0x0010000
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#define XFS_QMOPT_RES_RTBLKS 0x0020000
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#define XFS_QMOPT_BCOUNT 0x0040000
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#define XFS_QMOPT_ICOUNT 0x0080000
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#define XFS_QMOPT_RTBCOUNT 0x0100000
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#define XFS_QMOPT_DELBCOUNT 0x0200000
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#define XFS_QMOPT_DELRTBCOUNT 0x0400000
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#define XFS_QMOPT_RES_INOS 0x0800000
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/*
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* flags for dqalloc.
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*/
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#define XFS_QMOPT_INHERIT 0x1000000
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/*
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* flags to xfs_trans_mod_dquot.
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*/
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#define XFS_TRANS_DQ_RES_BLKS XFS_QMOPT_RES_REGBLKS
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#define XFS_TRANS_DQ_RES_RTBLKS XFS_QMOPT_RES_RTBLKS
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#define XFS_TRANS_DQ_RES_INOS XFS_QMOPT_RES_INOS
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#define XFS_TRANS_DQ_BCOUNT XFS_QMOPT_BCOUNT
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#define XFS_TRANS_DQ_DELBCOUNT XFS_QMOPT_DELBCOUNT
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#define XFS_TRANS_DQ_ICOUNT XFS_QMOPT_ICOUNT
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#define XFS_TRANS_DQ_RTBCOUNT XFS_QMOPT_RTBCOUNT
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#define XFS_TRANS_DQ_DELRTBCOUNT XFS_QMOPT_DELRTBCOUNT
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#define XFS_QMOPT_QUOTALL \
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(XFS_QMOPT_UQUOTA | XFS_QMOPT_PQUOTA | XFS_QMOPT_GQUOTA)
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#define XFS_QMOPT_RESBLK_MASK (XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_RES_RTBLKS)
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extern int xfs_dqcheck(struct xfs_mount *mp, xfs_disk_dquot_t *ddq,
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xfs_dqid_t id, uint type, uint flags, const char *str);
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extern int xfs_calc_dquots_per_chunk(unsigned int nbblks);
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#endif /* __XFS_QUOTA_H__ */
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