xfs: Add xfs_log_rlimit.c (5a96a945) · Commits · 戴 / test

fs/xfs/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -79,6 +79,7 @@ xfs-y += xfs_alloc.o \
		xfs_inode_fork.o \
		xfs_inode_buf.o \
		xfs_log_recover.o \
		xfs_log_rlimit.o \
		xfs_sb.o \
		xfs_symlink_remote.o \
		xfs_trans_resv.o

fs/xfs/xfs_log_format.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		#define __XFS_LOG_FORMAT_H__

		struct xfs_mount;
		struct xfs_trans_res;

		/*
		* On-disk Log Format definitions.
		@@ -51,6 +52,9 @@ typedef __uint32_t xlog_tid_t;

		#define XLOG_HEADER_SIZE 512

		/* Minimum number of transactions that must fit in the log (defined by mkfs) */
		#define XFS_MIN_LOG_FACTOR 3

		#define XLOG_REC_SHIFT(log) \
		BTOBB(1 << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \
		XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
		@@ -135,7 +139,6 @@ typedef struct xlog_op_header {
		__u16 oh_res2; /* 32 bit align : 2 b */
		} xlog_op_header_t;


		/* valid values for h_fmt */
		#define XLOG_FMT_UNKNOWN 0
		#define XLOG_FMT_LINUX_LE 1
		@@ -837,5 +840,7 @@ struct xfs_icreate_log {
		};

		int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
		int xfs_log_calc_minimum_size(struct xfs_mount *);


		#endif /* __XFS_LOG_FORMAT_H__ */

fs/xfs/xfs_log_rlimit.c

0 → 100644

+145 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2013 Jie Liu.
		* 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_log.h"
		#include "xfs_trans.h"
		#include "xfs_ag.h"
		#include "xfs_sb.h"
		#include "xfs_mount.h"
		#include "xfs_trans_space.h"
		#include "xfs_bmap_btree.h"
		#include "xfs_inode.h"
		#include "xfs_da_btree.h"
		#include "xfs_attr_leaf.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_sb.sb_blocksize) -
		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.
		*/
		STATIC 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(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);
		}

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