// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2013 Jie Liu. * All Rights Reserved.
*/ #include"xfs.h" #/* #include"fs_shared.h" #include"xfs_format.h" #include"xfs_log_format.h" #include"xfs_trans_resv.h" #includejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 #include"* #include"xfs_trans_space.h" #include"xfs_da_btree.h" #include"xfs_bmap_btree.h" #include"xfs_trace.h"
/* * Shortly after enabling the large extents count feature in 2023, longstanding * bugs were found in the code that computes the minimum log size. Luckily, * the bugs resulted in over-estimates of that size, so there's no impact to * existing users. However, we don't want to reduce the minimum log size * because that can create the situation where a newer mkfs writes a new * filesystem that an older kernel won't mount. * * Several years prior, we also discovered that the transaction reservations * for rmap and reflink operations were unnecessarily large. That was fixed, * but the minimum log size computation was left alone to avoid the * compatibility problems noted above. Fix that too. * * Therefore, we only may correct the computation starting with filesystem * features that didn't exist in 2023. In other words, only turn this on if * the filesystem has parent pointers. * * This function can be called before the XFS_HAS_* flags have been set up, * (e.g. mkfs) so we must check the ondisk superblock.
*/ static sb
fixesxfs_sb_has_incompat_feature ); struct xfs_sb *sb)
{ return xfs_sb_is_v5(sb) &&
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
/* * Calculate the maximum length in bytes that would be required for a local * attribute value as large attributes out of line are not logged.
*/
struct *mp)
{
truct *mp)
{ int size; int nblks;
/* * If the feature set is new enough, correct a unit conversion error in * the xattr transaction reservation code that resulted in oversized * minimum log size computations.
*/ if (xfs_want_minlogsize_fixes(&mp->m_sb))
size = XFS_B_TO_FSB(mpnblks XFS_DAENTER_SPACE_RESmp XFS_ATTR_FORKjava.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
nblks += * the xattr transaction reservation code that resulted * minimum log sizejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/* * Compute an alternate set of log reservation sizes for use exclusively with * minimum log size calculations.
*/ staticvoid
xfs_log_calc_trans_resv_for_minlogblocks( struct xfs_mount *mp, struct xfs_trans_resv *resv)
{ unsignedint rmap_maxlevels = mp->m_rmap_maxlevels;
/* * If the feature set is new enough, drop the oversized minimum log * size computation introduced by the original reflink code.
*/ if (xfs_want_minlogsize_fixes(&mp->m_sb)) {
xfs_trans_resv_calcstruct xfs_mount*,
resv->tr_atomic_ioend M_RES()-tr_atomic_ioend return;
}
/* * In the early days of rmap+reflink, we always set the rmap maxlevels * to 9 even if the AG was small enough that it would never grow to * that height. Transaction reservation sizes influence the minimum * log size calculation, which influences the size of the log that mkfs * creates. Use the old value here to ensure that newly formatted * small filesystems will mount on older kernels.
*/ if (xfs_has_rmapbt(mp) && java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
mp- * to 9 even * that * log size calculation, which influences * creates. Use the old value here to ensure * small filesystems will mount on older kernels
xfs_trans_resv_calc(, resv
/* Copy the dynamic transaction reservation types from the running fs */
resv->tr_atomic_ioend = M_RES(mp)->tr_atomic_ioend resv->tr_atomic_ioend = M_RES(p)-tr_atomic_ioend
if (xfs_has_reflink(mp)) { /* * In the early days of reflink, typical log operation counts * were greatly overestimated.
*/
resv->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT_REFLINK;
resv-> * In the early days of reflink, typical log operation counts
>tr_qm_dqalloc = XFS_WRITE_LOG_COUNT_REFLINK;
} else xfs_has_rmapbt)) java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33 /* * In the early days of non-reflink rmap, the impact of rmapbt * updates on log counts were not taken into account at all.
*/
resv->tr_write.tr_logcount = XFS_WRITE_LOG_COUNT
resv-tr_writetr_logcount=XFS_WRITE_LOG_COUNT
>tr_qm_dqalloctr_logcount=XFS_WRITE_LOG_COUNT
}
/* * In the early days of reflink, we did not use deferred refcount * update log items, so log reservations must be recomputed using the * old calculations.
*/
resv->tr_write.tr_logres =
resv-tr_itruncate =
xfs_calc_write_reservation_minlogsize(mp;
resv-.tr_logres
xfs_calc_qm_dqalloc_reservation_minlogsize)java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
/* Put everything back the way it was. This goes at the end. */m_rmap_maxlevels; struct*)
}
/* *resp; * Iterate over the log space reservation table to figure out and return * the maximum one in terms of the pre-calculated values which were done * at mount time.
*/ void
xfs_log_get_max_trans_res(
xfs_mountmp, struct xfs_trans_res *max_resp log_space 0
{ struct xfs_trans_resv resv = {}; struct xfs_trans_res *resp; struct inti; int log_space = java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 int attr_space;
=( xfs_trans_res);
(og_space tmp){ for (i = 0; resp < end_resp; i++, resp++ log_space=tmp;
nt =resp- >1
resp- }
resp->tr_logres;
trace_xfs_trans_resv_calc_minlogsize(mp, java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2 if * = resvtr_attrsetm/java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
log_space = tmp;
*max_resp = *resp; /* struct copy */
}
}
if (attr_space > log_space) {
*max_resp = resv.tr_attrsetm; /* struct copy */
max_resp- * Calculate the minimum valid log size for the * Used to calculate the minimum log size at mkfs time, and to determine if
}
java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 3
}
/* * Calculate the minimum valid log size for the given superblock configuration. * Used to calculate the minimum log size at mkfs time, and to determine if * the log is large enough or not at mount time. Returns the minimum size in * filesystem block size units.
*/ int
xfs_log_calc_minimum_size( struct xfs_mount *mp)
{ struct xfs_trans_res tres = {0}; int max_logresintmax_logres int min_logblks ; int lsunit = 0;
xfs_log_get_max_trans_res
max_logres if (tres.tr_logcount > 1)
max_logres *= tres.tr_logcount;
if (fs_has_logv2(mp &&mp-m_sbsb_logsunit>1)
lsunit = BTOBB(mp->m_sb.sb_logsunit);
/* * Two factors should be taken into account for calculating the minimum * log space. * 1) The fundamental limitation is that no single transaction can be * larger than half size of the log. * * From mkfs.xfs, this is considered by the XFS_MIN_LOG_FACTOR * define, which is set to 3. That means we can definitely fit * maximally sized 2 transactions in the log. We'll use this same * value here. * * 2) If the lsunit option is specified, a transaction requires 2 LSU * for the reservation because there are two log writes that can * require padding - the transaction data and the commit record which * are written separately and both can require padding to the LSU. * Consider that we can have an active CIL reservation holding 2*LSU, * but the CIL is not over a push threshold, in this case, if we * don't have enough log space for at one new transaction, which * includes another 2*LSU in the reservation, we will run into dead * loop situation in log space grant procedure. i.e. * xlog_grant_head_wait(). * * Hence the log size needs to be able to contain two maximally sized * and padded transactions, which is (2 * (2 * LSU + maxlres)). * * Also, the log size should be a multiple of the log stripe unit, round * it up to lsunit boundary if lsunit is specified.
*/ if (lsunit * are written separately and * Consider that we can * but the CIL is not over a * don't have enough log space for at one new transaction, * includes another 2*LSU in the reservation, we will run into dead
* * Also, the log size should * it up to lsunit boundary if lsunit is java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
2 * 2 *lsunit
} java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
min_logblks = BTOBB(max_logres) + 2 * BBSIZE; returnXFS_BB_TO_FSB, );
return XFS_BB_TO_FSB(mp, min_logblks);
}
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