mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
134 lines
4.0 KiB
134 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (c) 2013 Jie Liu. |
|
* All Rights Reserved. |
|
*/ |
|
#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_da_format.h" |
|
#include "xfs_trans_space.h" |
|
#include "xfs_da_btree.h" |
|
#include "xfs_bmap_btree.h" |
|
|
|
/* |
|
* Calculate the maximum length in bytes that would be required for a local |
|
* attribute value as large attributes out of line are not logged. |
|
*/ |
|
STATIC int |
|
xfs_log_calc_max_attrsetm_res( |
|
struct xfs_mount *mp) |
|
{ |
|
int size; |
|
int nblks; |
|
|
|
size = xfs_attr_leaf_entsize_local_max(mp->m_attr_geo->blksize) - |
|
MAXNAMELEN - 1; |
|
nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK); |
|
nblks += XFS_B_TO_FSB(mp, size); |
|
nblks += XFS_NEXTENTADD_SPACE_RES(mp, size, XFS_ATTR_FORK); |
|
|
|
return M_RES(mp)->tr_attrsetm.tr_logres + |
|
M_RES(mp)->tr_attrsetrt.tr_logres * nblks; |
|
} |
|
|
|
/* |
|
* 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( |
|
struct xfs_mount *mp, |
|
struct xfs_trans_res *max_resp) |
|
{ |
|
struct xfs_trans_res *resp; |
|
struct xfs_trans_res *end_resp; |
|
int log_space = 0; |
|
int attr_space; |
|
|
|
attr_space = xfs_log_calc_max_attrsetm_res(mp); |
|
|
|
resp = (struct xfs_trans_res *)M_RES(mp); |
|
end_resp = (struct xfs_trans_res *)(M_RES(mp) + 1); |
|
for (; resp < end_resp; resp++) { |
|
int tmp = resp->tr_logcount > 1 ? |
|
resp->tr_logres * resp->tr_logcount : |
|
resp->tr_logres; |
|
if (log_space < tmp) { |
|
log_space = tmp; |
|
*max_resp = *resp; /* struct copy */ |
|
} |
|
} |
|
|
|
if (attr_space > log_space) { |
|
*max_resp = M_RES(mp)->tr_attrsetm; /* struct copy */ |
|
max_resp->tr_logres = attr_space; |
|
} |
|
} |
|
|
|
/* |
|
* 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_logres; |
|
int min_logblks = 0; |
|
int lsunit = 0; |
|
|
|
xfs_log_get_max_trans_res(mp, &tres); |
|
|
|
max_logres = xfs_log_calc_unit_res(mp, tres.tr_logres); |
|
if (tres.tr_logcount > 1) |
|
max_logres *= tres.tr_logcount; |
|
|
|
if (xfs_sb_version_haslogv2(&mp->m_sb) && mp->m_sb.sb_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) { |
|
min_logblks = roundup_64(BTOBB(max_logres), lsunit) + |
|
2 * lsunit; |
|
} else |
|
min_logblks = BTOBB(max_logres) + 2 * BBSIZE; |
|
min_logblks *= XFS_MIN_LOG_FACTOR; |
|
|
|
return XFS_BB_TO_FSB(mp, min_logblks); |
|
}
|
|
|