minix/sys/ufs/ffs/ffs_wapbl.c
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

884 lines
24 KiB
C

/* $NetBSD: ffs_wapbl.c,v 1.25 2013/10/25 11:35:55 martin Exp $ */
/*-
* Copyright (c) 2003,2006,2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_wapbl.c,v 1.25 2013/10/25 11:35:55 martin Exp $");
#define WAPBL_INTERNAL
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/kauth.h>
#include <sys/wapbl.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_wapbl.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#undef WAPBL_DEBUG
#ifdef WAPBL_DEBUG
int ffs_wapbl_debug = 1;
#define DPRINTF(fmt, args...) \
do { \
if (ffs_wapbl_debug) \
printf("%s:%d "fmt, __func__ , __LINE__, ##args); \
} while (/* CONSTCOND */0)
#else
#define DPRINTF(fmt, args...) \
do { \
/* nothing */ \
} while (/* CONSTCOND */0)
#endif
static int ffs_superblock_layout(struct fs *);
static int wapbl_log_position(struct mount *, struct fs *, struct vnode *,
daddr_t *, size_t *, size_t *, uint64_t *);
static int wapbl_create_infs_log(struct mount *, struct fs *, struct vnode *,
daddr_t *, size_t *, uint64_t *);
static void wapbl_find_log_start(struct mount *, struct vnode *, off_t,
daddr_t *, daddr_t *, size_t *);
static int wapbl_remove_log(struct mount *);
static int wapbl_allocate_log_file(struct mount *, struct vnode *,
daddr_t *, size_t *, uint64_t *);
/*
* Return the super block layout format - UFS1 or UFS2.
* WAPBL only works with UFS2 layout (which is still available
* with FFSv1).
*
* XXX Should this be in ufs/ffs/fs.h? Same style of check is
* also used in ffs_alloc.c in a few places.
*/
static int
ffs_superblock_layout(struct fs *fs)
{
if ((fs->fs_magic == FS_UFS1_MAGIC) &&
((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0))
return 1;
else
return 2;
}
/*
* This function is invoked after a log is replayed to
* disk to perform logical cleanup actions as described by
* the log
*/
void
ffs_wapbl_replay_finish(struct mount *mp)
{
struct wapbl_replay *wr = mp->mnt_wapbl_replay;
int i;
int error;
if (!wr)
return;
KDASSERT((mp->mnt_flag & MNT_RDONLY) == 0);
for (i = 0; i < wr->wr_inodescnt; i++) {
struct vnode *vp;
struct inode *ip;
error = VFS_VGET(mp, wr->wr_inodes[i].wr_inumber, &vp);
if (error) {
printf("ffs_wapbl_replay_finish: "
"unable to cleanup inode %" PRIu32 "\n",
wr->wr_inodes[i].wr_inumber);
continue;
}
ip = VTOI(vp);
KDASSERT(wr->wr_inodes[i].wr_inumber == ip->i_number);
#ifdef WAPBL_DEBUG
printf("ffs_wapbl_replay_finish: "
"cleaning inode %" PRIu64 " size=%" PRIu64 " mode=%o nlink=%d\n",
ip->i_number, ip->i_size, ip->i_mode, ip->i_nlink);
#endif
KASSERT(ip->i_nlink == 0);
/*
* The journal may have left partially allocated inodes in mode
* zero. This may occur if a crash occurs betweeen the node
* allocation in ffs_nodeallocg and when the node is properly
* initialized in ufs_makeinode. If so, just dallocate them.
*/
if (ip->i_mode == 0) {
UFS_WAPBL_BEGIN(mp);
ffs_vfree(vp, ip->i_number, wr->wr_inodes[i].wr_imode);
UFS_WAPBL_END(mp);
}
vput(vp);
}
wapbl_replay_stop(wr);
wapbl_replay_free(wr);
mp->mnt_wapbl_replay = NULL;
}
/* Callback for wapbl */
void
ffs_wapbl_sync_metadata(struct mount *mp, daddr_t *deallocblks,
int *dealloclens, int dealloccnt)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
int i, error __diagused;
#ifdef WAPBL_DEBUG_INODES
ufs_wapbl_verify_inodes(mp, "ffs_wapbl_sync_metadata");
#endif
for (i = 0; i< dealloccnt; i++) {
/*
* blkfree errors are unreported, might silently fail
* if it cannot read the cylinder group block
*/
ffs_blkfree(fs, ump->um_devvp,
FFS_DBTOFSB(fs, deallocblks[i]), dealloclens[i], -1);
}
fs->fs_fmod = 0;
fs->fs_time = time_second;
error = ffs_cgupdate(ump, 0);
KASSERT(error == 0);
}
void
ffs_wapbl_abort_sync_metadata(struct mount *mp, daddr_t *deallocblks,
int *dealloclens, int dealloccnt)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
int i;
for (i = 0; i < dealloccnt; i++) {
/*
* Since the above blkfree may have failed, this blkalloc might
* fail as well, so don't check its error. Note that if the
* blkfree succeeded above, then this shouldn't fail because
* the buffer will be locked in the current transaction.
*/
ffs_blkalloc_ump(ump, FFS_DBTOFSB(fs, deallocblks[i]),
dealloclens[i]);
}
}
static int
wapbl_remove_log(struct mount *mp)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
struct vnode *vp;
struct inode *ip;
ino_t log_ino;
int error;
/* If super block layout is too old to support WAPBL, return */
if (ffs_superblock_layout(fs) < 2)
return 0;
/* If all the log locators are 0, just clean up */
if (fs->fs_journallocs[0] == 0 &&
fs->fs_journallocs[1] == 0 &&
fs->fs_journallocs[2] == 0 &&
fs->fs_journallocs[3] == 0) {
DPRINTF("empty locators, just clear\n");
goto done;
}
switch (fs->fs_journal_location) {
case UFS_WAPBL_JOURNALLOC_NONE:
/* nothing! */
DPRINTF("no log\n");
break;
case UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM:
log_ino = fs->fs_journallocs[UFS_WAPBL_INFS_INO];
DPRINTF("in-fs log, ino = %" PRId64 "\n",log_ino);
/* if no existing log inode, just clear all fields and bail */
if (log_ino == 0)
goto done;
error = VFS_VGET(mp, log_ino, &vp);
if (error != 0) {
printf("ffs_wapbl: vget failed %d\n",
error);
/* clear out log info on error */
goto done;
}
ip = VTOI(vp);
KASSERT(log_ino == ip->i_number);
if ((ip->i_flags & SF_LOG) == 0) {
printf("ffs_wapbl: try to clear non-log inode "
"%" PRId64 "\n", log_ino);
vput(vp);
/* clear out log info on error */
goto done;
}
/*
* remove the log inode by setting its link count back
* to zero and bail.
*/
ip->i_nlink = 0;
DIP_ASSIGN(ip, nlink, 0);
vput(vp);
case UFS_WAPBL_JOURNALLOC_END_PARTITION:
DPRINTF("end-of-partition log\n");
/* no extra work required */
break;
default:
printf("ffs_wapbl: unknown journal type %d\n",
fs->fs_journal_location);
break;
}
done:
/* Clear out all previous knowledge of journal */
fs->fs_journal_version = 0;
fs->fs_journal_location = 0;
fs->fs_journal_flags = 0;
fs->fs_journallocs[0] = 0;
fs->fs_journallocs[1] = 0;
fs->fs_journallocs[2] = 0;
fs->fs_journallocs[3] = 0;
(void) ffs_sbupdate(ump, MNT_WAIT);
return 0;
}
int
ffs_wapbl_start(struct mount *mp)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
struct vnode *devvp = ump->um_devvp;
daddr_t off;
size_t count;
size_t blksize;
uint64_t extradata;
int error;
if (mp->mnt_wapbl == NULL) {
if (fs->fs_journal_flags & UFS_WAPBL_FLAGS_CLEAR_LOG) {
/* Clear out any existing journal file */
error = wapbl_remove_log(mp);
if (error != 0)
return error;
}
if (mp->mnt_flag & MNT_LOG) {
KDASSERT(fs->fs_ronly == 0);
/* WAPBL needs UFS2 format super block */
if (ffs_superblock_layout(fs) < 2) {
printf("%s fs superblock in old format, "
"not journaling\n",
VFSTOUFS(mp)->um_fs->fs_fsmnt);
mp->mnt_flag &= ~MNT_LOG;
return EINVAL;
}
error = wapbl_log_position(mp, fs, devvp, &off,
&count, &blksize, &extradata);
if (error)
return error;
error = wapbl_start(&mp->mnt_wapbl, mp, devvp, off,
count, blksize, mp->mnt_wapbl_replay,
ffs_wapbl_sync_metadata,
ffs_wapbl_abort_sync_metadata);
if (error)
return error;
mp->mnt_wapbl_op = &wapbl_ops;
#ifdef WAPBL_DEBUG
printf("%s: enabling logging\n", fs->fs_fsmnt);
#endif
if ((fs->fs_flags & FS_DOWAPBL) == 0) {
UFS_WAPBL_BEGIN(mp);
fs->fs_flags |= FS_DOWAPBL;
error = ffs_sbupdate(ump, MNT_WAIT);
if (error) {
UFS_WAPBL_END(mp);
ffs_wapbl_stop(mp, MNT_FORCE);
return error;
}
UFS_WAPBL_END(mp);
error = wapbl_flush(mp->mnt_wapbl, 1);
if (error) {
ffs_wapbl_stop(mp, MNT_FORCE);
return error;
}
}
} else if (fs->fs_flags & FS_DOWAPBL) {
fs->fs_fmod = 1;
fs->fs_flags &= ~FS_DOWAPBL;
}
}
/*
* It is recommended that you finish replay with logging enabled.
* However, even if logging is not enabled, the remaining log
* replay should be safely recoverable with an fsck, so perform
* it anyway.
*/
if ((fs->fs_ronly == 0) && mp->mnt_wapbl_replay) {
int saveflag = mp->mnt_flag & MNT_RDONLY;
/*
* Make sure MNT_RDONLY is not set so that the inode
* cleanup in ufs_inactive will actually do its work.
*/
mp->mnt_flag &= ~MNT_RDONLY;
ffs_wapbl_replay_finish(mp);
mp->mnt_flag |= saveflag;
KASSERT(fs->fs_ronly == 0);
}
return 0;
}
int
ffs_wapbl_stop(struct mount *mp, int force)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
int error;
if (mp->mnt_wapbl) {
KDASSERT(fs->fs_ronly == 0);
/*
* Make sure turning off FS_DOWAPBL is only removed
* as the only change in the final flush since otherwise
* a transaction may reorder writes.
*/
error = wapbl_flush(mp->mnt_wapbl, 1);
if (error && !force)
return error;
if (error && force)
goto forceout;
error = UFS_WAPBL_BEGIN(mp);
if (error && !force)
return error;
if (error && force)
goto forceout;
KASSERT(fs->fs_flags & FS_DOWAPBL);
fs->fs_flags &= ~FS_DOWAPBL;
error = ffs_sbupdate(ump, MNT_WAIT);
KASSERT(error == 0); /* XXX a bit drastic! */
UFS_WAPBL_END(mp);
forceout:
error = wapbl_stop(mp->mnt_wapbl, force);
if (error) {
KASSERT(!force);
fs->fs_flags |= FS_DOWAPBL;
return error;
}
fs->fs_flags &= ~FS_DOWAPBL; /* Repeat in case of forced error */
mp->mnt_wapbl = NULL;
#ifdef WAPBL_DEBUG
printf("%s: disabled logging\n", fs->fs_fsmnt);
#endif
}
return 0;
}
int
ffs_wapbl_replay_start(struct mount *mp, struct fs *fs, struct vnode *devvp)
{
int error;
daddr_t off;
size_t count;
size_t blksize;
uint64_t extradata;
/*
* WAPBL needs UFS2 format super block, if we got here with a
* UFS1 format super block something is amiss...
*/
if (ffs_superblock_layout(fs) < 2)
return EINVAL;
error = wapbl_log_position(mp, fs, devvp, &off, &count, &blksize,
&extradata);
if (error)
return error;
error = wapbl_replay_start(&mp->mnt_wapbl_replay, devvp, off,
count, blksize);
if (error)
return error;
mp->mnt_wapbl_op = &wapbl_ops;
return 0;
}
/*
* If the superblock doesn't already have a recorded journal location
* then we allocate the journal in one of two positions:
*
* - At the end of the partition after the filesystem if there's
* enough space. "Enough space" is defined as >= 1MB of journal
* per 1GB of filesystem or 64MB, whichever is smaller.
*
* - Inside the filesystem. We try to allocate a contiguous journal
* based on the total filesystem size - the target is 1MB of journal
* per 1GB of filesystem, up to a maximum journal size of 64MB. As
* a worst case allowing for fragmentation, we'll allocate a journal
* 1/4 of the desired size but never smaller than 1MB.
*
* XXX In the future if we allow for non-contiguous journal files we
* can tighten the above restrictions.
*
* XXX
* These seems like a lot of duplication both here and in some of
* the userland tools (fsck_ffs, dumpfs, tunefs) with similar
* "switch (fs_journal_location)" constructs. Can we centralise
* this sort of code somehow/somewhere?
*/
static int
wapbl_log_position(struct mount *mp, struct fs *fs, struct vnode *devvp,
daddr_t *startp, size_t *countp, size_t *blksizep, uint64_t *extradatap)
{
struct ufsmount *ump = VFSTOUFS(mp);
daddr_t logstart, logend, desired_logsize;
uint64_t numsecs;
unsigned secsize;
int error, location;
if (fs->fs_journal_version == UFS_WAPBL_VERSION) {
switch (fs->fs_journal_location) {
case UFS_WAPBL_JOURNALLOC_END_PARTITION:
DPRINTF("found existing end-of-partition log\n");
*startp = fs->fs_journallocs[UFS_WAPBL_EPART_ADDR];
*countp = fs->fs_journallocs[UFS_WAPBL_EPART_COUNT];
*blksizep = fs->fs_journallocs[UFS_WAPBL_EPART_BLKSZ];
DPRINTF(" start = %" PRId64 ", size = %zu, "
"blksize = %zu\n", *startp, *countp, *blksizep);
return 0;
case UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM:
DPRINTF("found existing in-filesystem log\n");
*startp = fs->fs_journallocs[UFS_WAPBL_INFS_ADDR];
*countp = fs->fs_journallocs[UFS_WAPBL_INFS_COUNT];
*blksizep = fs->fs_journallocs[UFS_WAPBL_INFS_BLKSZ];
DPRINTF(" start = %" PRId64 ", size = %zu, "
"blksize = %zu\n", *startp, *countp, *blksizep);
return 0;
default:
printf("ffs_wapbl: unknown journal type %d\n",
fs->fs_journal_location);
return EINVAL;
}
}
desired_logsize =
ffs_lfragtosize(fs, fs->fs_size) / UFS_WAPBL_JOURNAL_SCALE;
DPRINTF("desired log size = %" PRId64 " kB\n", desired_logsize / 1024);
desired_logsize = max(desired_logsize, UFS_WAPBL_MIN_JOURNAL_SIZE);
desired_logsize = min(desired_logsize, UFS_WAPBL_MAX_JOURNAL_SIZE);
DPRINTF("adjusted desired log size = %" PRId64 " kB\n",
desired_logsize / 1024);
/* Is there space after after filesystem on partition for log? */
logstart = FFS_FSBTODB(fs, fs->fs_size);
error = getdisksize(devvp, &numsecs, &secsize);
if (error)
return error;
KDASSERT(secsize != 0);
logend = btodb(numsecs * secsize);
if (dbtob(logend - logstart) >= desired_logsize) {
DPRINTF("enough space, use end-of-partition log\n");
location = UFS_WAPBL_JOURNALLOC_END_PARTITION;
*blksizep = secsize;
*startp = logstart;
*countp = (logend - logstart);
*extradatap = 0;
/* convert to physical block numbers */
*startp = dbtob(*startp) / secsize;
*countp = dbtob(*countp) / secsize;
fs->fs_journallocs[UFS_WAPBL_EPART_ADDR] = *startp;
fs->fs_journallocs[UFS_WAPBL_EPART_COUNT] = *countp;
fs->fs_journallocs[UFS_WAPBL_EPART_BLKSZ] = *blksizep;
fs->fs_journallocs[UFS_WAPBL_EPART_UNUSED] = *extradatap;
} else {
DPRINTF("end-of-partition has only %" PRId64 " free\n",
logend - logstart);
location = UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM;
*blksizep = secsize;
error = wapbl_create_infs_log(mp, fs, devvp,
startp, countp, extradatap);
ffs_sync(mp, MNT_WAIT, FSCRED);
/* convert to physical block numbers */
*startp = dbtob(*startp) / secsize;
*countp = dbtob(*countp) / secsize;
fs->fs_journallocs[UFS_WAPBL_INFS_ADDR] = *startp;
fs->fs_journallocs[UFS_WAPBL_INFS_COUNT] = *countp;
fs->fs_journallocs[UFS_WAPBL_INFS_BLKSZ] = *blksizep;
fs->fs_journallocs[UFS_WAPBL_INFS_INO] = *extradatap;
}
if (error == 0) {
/* update superblock with log location */
fs->fs_journal_version = UFS_WAPBL_VERSION;
fs->fs_journal_location = location;
fs->fs_journal_flags = 0;
error = ffs_sbupdate(ump, MNT_WAIT);
}
return error;
}
/*
* Try to create a journal log inside the filesystem.
*/
static int
wapbl_create_infs_log(struct mount *mp, struct fs *fs, struct vnode *devvp,
daddr_t *startp, size_t *countp, uint64_t *extradatap)
{
struct vnode *vp, *rvp;
struct inode *ip;
int error;
if ((error = VFS_ROOT(mp, &rvp)) != 0)
return error;
error = UFS_VALLOC(rvp, 0 | S_IFREG, NOCRED, &vp);
if (mp->mnt_flag & MNT_UPDATE) {
vput(rvp);
} else {
VOP_UNLOCK(rvp);
vgone(rvp);
}
if (error != 0)
return error;
vp->v_type = VREG;
ip = VTOI(vp);
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = 0 | IFREG;
DIP_ASSIGN(ip, mode, ip->i_mode);
ip->i_flags = SF_LOG;
DIP_ASSIGN(ip, flags, ip->i_flags);
ip->i_nlink = 1;
DIP_ASSIGN(ip, nlink, 1);
ffs_update(vp, NULL, NULL, UPDATE_WAIT);
if ((error = wapbl_allocate_log_file(mp, vp,
startp, countp, extradatap)) != 0) {
/*
* If we couldn't allocate the space for the log file,
* remove the inode by setting its link count back to
* zero and bail.
*/
ip->i_nlink = 0;
DIP_ASSIGN(ip, nlink, 0);
VOP_UNLOCK(vp);
vgone(vp);
return error;
}
/*
* Now that we have the place-holder inode for the journal,
* we don't need the vnode ever again.
*/
VOP_UNLOCK(vp);
vgone(vp);
return 0;
}
int
wapbl_allocate_log_file(struct mount *mp, struct vnode *vp,
daddr_t *startp, size_t *countp, uint64_t *extradatap)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
daddr_t addr, indir_addr;
off_t logsize;
size_t size;
int error;
logsize = 0;
/* check if there's a suggested log size */
if (fs->fs_journal_flags & UFS_WAPBL_FLAGS_CREATE_LOG &&
fs->fs_journal_location == UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM)
logsize = fs->fs_journallocs[UFS_WAPBL_INFS_COUNT];
if (vp->v_size > 0) {
printf("%s: file size (%" PRId64 ") non zero\n", __func__,
vp->v_size);
return EEXIST;
}
wapbl_find_log_start(mp, vp, logsize, &addr, &indir_addr, &size);
if (addr == 0) {
printf("%s: log not allocated, largest extent is "
"%" PRId64 "MB\n", __func__,
ffs_lblktosize(fs, size) / (1024 * 1024));
return ENOSPC;
}
logsize = ffs_lblktosize(fs, size); /* final log size */
VTOI(vp)->i_ffs_first_data_blk = addr;
VTOI(vp)->i_ffs_first_indir_blk = indir_addr;
error = GOP_ALLOC(vp, 0, logsize, B_CONTIG, FSCRED);
if (error) {
printf("%s: GOP_ALLOC error %d\n", __func__, error);
return error;
}
*startp = FFS_FSBTODB(fs, addr);
*countp = btodb(logsize);
*extradatap = VTOI(vp)->i_number;
return 0;
}
/*
* Find a suitable location for the journal in the filesystem.
*
* Our strategy here is to look for a contiguous block of free space
* at least "logfile" MB in size (plus room for any indirect blocks).
* We start at the middle of the filesystem and check each cylinder
* group working outwards. If "logfile" MB is not available as a
* single contigous chunk, then return the address and size of the
* largest chunk found.
*
* XXX
* At what stage does the search fail? Is if the largest space we could
* find is less than a quarter the requested space reasonable? If the
* search fails entirely, return a block address if "0" it indicate this.
*/
static void
wapbl_find_log_start(struct mount *mp, struct vnode *vp, off_t logsize,
daddr_t *addr, daddr_t *indir_addr, size_t *size)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs = ump->um_fs;
struct vnode *devvp = ump->um_devvp;
struct cg *cgp;
struct buf *bp;
uint8_t *blksfree;
daddr_t blkno, best_addr, start_addr;
daddr_t desired_blks, min_desired_blks;
daddr_t freeblks, best_blks;
int bpcg, cg, error, fixedsize, indir_blks, n, s;
const int needswap = UFS_FSNEEDSWAP(fs);
if (logsize == 0) {
fixedsize = 0; /* We can adjust the size if tight */
logsize = ffs_lfragtosize(fs, fs->fs_dsize) /
UFS_WAPBL_JOURNAL_SCALE;
DPRINTF("suggested log size = %" PRId64 "\n", logsize);
logsize = max(logsize, UFS_WAPBL_MIN_JOURNAL_SIZE);
logsize = min(logsize, UFS_WAPBL_MAX_JOURNAL_SIZE);
DPRINTF("adjusted log size = %" PRId64 "\n", logsize);
} else {
fixedsize = 1;
DPRINTF("fixed log size = %" PRId64 "\n", logsize);
}
desired_blks = logsize / fs->fs_bsize;
DPRINTF("desired blocks = %" PRId64 "\n", desired_blks);
/* add in number of indirect blocks needed */
indir_blks = 0;
if (desired_blks >= UFS_NDADDR) {
struct indir indirs[UFS_NIADDR + 2];
int num;
error = ufs_getlbns(vp, desired_blks, indirs, &num);
if (error) {
printf("%s: ufs_getlbns failed, error %d!\n",
__func__, error);
goto bad;
}
switch (num) {
case 2:
indir_blks = 1; /* 1st level indirect */
break;
case 3:
indir_blks = 1 + /* 1st level indirect */
1 + /* 2nd level indirect */
indirs[1].in_off + 1; /* extra 1st level indirect */
break;
default:
printf("%s: unexpected numlevels %d from ufs_getlbns\n",
__func__, num);
*size = 0;
goto bad;
}
desired_blks += indir_blks;
}
DPRINTF("desired blocks = %" PRId64 " (including indirect)\n",
desired_blks);
/*
* If a specific size wasn't requested, allow for a smaller log
* if we're really tight for space...
*/
min_desired_blks = desired_blks;
if (!fixedsize)
min_desired_blks = desired_blks / 4;
/* Look at number of blocks per CG. If it's too small, bail early. */
bpcg = ffs_fragstoblks(fs, fs->fs_fpg);
if (min_desired_blks > bpcg) {
printf("ffs_wapbl: cylinder group size of %" PRId64 " MB "
" is not big enough for journal\n",
ffs_lblktosize(fs, bpcg) / (1024 * 1024));
goto bad;
}
/*
* Start with the middle cylinder group, and search outwards in
* both directions until we either find the requested log size
* or reach the start/end of the file system. If we reach the
* start/end without finding enough space for the full requested
* log size, use the largest extent found if it is large enough
* to satisfy the our minimum size.
*
* XXX
* Can we just use the cluster contigsum stuff (esp on UFS2)
* here to simplify this search code?
*/
best_addr = 0;
best_blks = 0;
for (cg = fs->fs_ncg / 2, s = 0, n = 1;
best_blks < desired_blks && cg >= 0 && cg < fs->fs_ncg;
s++, n = -n, cg += n * s) {
DPRINTF("check cg %d of %d\n", cg, fs->fs_ncg);
error = bread(devvp, FFS_FSBTODB(fs, cgtod(fs, cg)),
fs->fs_cgsize, FSCRED, 0, &bp);
if (error) {
continue;
}
cgp = (struct cg *)bp->b_data;
if (!cg_chkmagic(cgp, UFS_FSNEEDSWAP(fs))) {
brelse(bp, 0);
continue;
}
blksfree = cg_blksfree(cgp, needswap);
for (blkno = 0; blkno < bpcg;) {
/* look for next free block */
/* XXX use scanc() and fragtbl[] here? */
for (; blkno < bpcg - min_desired_blks; blkno++)
if (ffs_isblock(fs, blksfree, blkno))
break;
/* past end of search space in this CG? */
if (blkno >= bpcg - min_desired_blks)
break;
/* count how many free blocks in this extent */
start_addr = blkno;
for (freeblks = 0; blkno < bpcg; blkno++, freeblks++)
if (!ffs_isblock(fs, blksfree, blkno))
break;
if (freeblks > best_blks) {
best_blks = freeblks;
best_addr = ffs_blkstofrags(fs, start_addr) +
cgbase(fs, cg);
if (freeblks >= desired_blks) {
DPRINTF("found len %" PRId64
" at offset %" PRId64 " in gc\n",
freeblks, start_addr);
break;
}
}
}
brelse(bp, 0);
}
DPRINTF("best found len = %" PRId64 ", wanted %" PRId64
" at addr %" PRId64 "\n", best_blks, desired_blks, best_addr);
if (best_blks < min_desired_blks) {
*addr = 0;
*indir_addr = 0;
} else {
/* put indirect blocks at start, and data blocks after */
*addr = best_addr + ffs_blkstofrags(fs, indir_blks);
*indir_addr = best_addr;
}
*size = min(desired_blks, best_blks) - indir_blks;
return;
bad:
*addr = 0;
*indir_addr = 0;
*size = 0;
return;
}