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android_kernel_xiaomi_sm8350/fs/jfs/jfs_imap.c
Dave Kleikamp ac17b8b570 JFS: make special inodes play nicely with page balancing 
This patch fixes up a few problems with jfs's reserved inodes.

1. There is no need for the jfs code setting the I_DIRTY bits in i_state.
   I am ashamed that the code ever did this, and surprised it hasn't been
   noticed until now.

2. Make sure special inodes are on an inode hash list.  If the inodes are
   unhashed, __mark_inode_dirty will fail to put the inode on the
   superblock's dirty list, and the data will not be flushed under memory
   pressure.

3. Force writing journal data to disk when metapage_writepage is unable to
   write a metadata page due to pending journal I/O.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2005-10-03 15:32:11 -05:00

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/*
* Copyright (C) International Business Machines Corp., 2000-2004
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will 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 to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* jfs_imap.c: inode allocation map manager
*
* Serialization:
* Each AG has a simple lock which is used to control the serialization of
* the AG level lists. This lock should be taken first whenever an AG
* level list will be modified or accessed.
*
* Each IAG is locked by obtaining the buffer for the IAG page.
*
* There is also a inode lock for the inode map inode. A read lock needs to
* be taken whenever an IAG is read from the map or the global level
* information is read. A write lock needs to be taken whenever the global
* level information is modified or an atomic operation needs to be used.
*
* If more than one IAG is read at one time, the read lock may not
* be given up until all of the IAG's are read. Otherwise, a deadlock
* may occur when trying to obtain the read lock while another thread
* holding the read lock is waiting on the IAG already being held.
*
* The control page of the inode map is read into memory by diMount().
* Thereafter it should only be modified in memory and then it will be
* written out when the filesystem is unmounted by diUnmount().
*/
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_filsys.h"
#include "jfs_dinode.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_superblock.h"
#include "jfs_debug.h"
/*
* __mark_inode_dirty expects inodes to be hashed. Since we don't want
* special inodes in the fileset inode space, we hash them to a dummy head
*/
static HLIST_HEAD(aggregate_hash);
/*
* imap locks
*/
/* iag free list lock */
#define IAGFREE_LOCK_INIT(imap) init_MUTEX(&imap->im_freelock)
#define IAGFREE_LOCK(imap) down(&imap->im_freelock)
#define IAGFREE_UNLOCK(imap) up(&imap->im_freelock)
/* per ag iag list locks */
#define AG_LOCK_INIT(imap,index) init_MUTEX(&(imap->im_aglock[index]))
#define AG_LOCK(imap,agno) down(&imap->im_aglock[agno])
#define AG_UNLOCK(imap,agno) up(&imap->im_aglock[agno])
/*
* forward references
*/
static int diAllocAG(struct inomap *, int, boolean_t, struct inode *);
static int diAllocAny(struct inomap *, int, boolean_t, struct inode *);
static int diAllocBit(struct inomap *, struct iag *, int);
static int diAllocExt(struct inomap *, int, struct inode *);
static int diAllocIno(struct inomap *, int, struct inode *);
static int diFindFree(u32, int);
static int diNewExt(struct inomap *, struct iag *, int);
static int diNewIAG(struct inomap *, int *, int, struct metapage **);
static void duplicateIXtree(struct super_block *, s64, int, s64 *);
static int diIAGRead(struct inomap * imap, int, struct metapage **);
static int copy_from_dinode(struct dinode *, struct inode *);
static void copy_to_dinode(struct dinode *, struct inode *);
/*
* NAME: diMount()
*
* FUNCTION: initialize the incore inode map control structures for
* a fileset or aggregate init time.
*
* the inode map's control structure (dinomap) is
* brought in from disk and placed in virtual memory.
*
* PARAMETERS:
* ipimap - pointer to inode map inode for the aggregate or fileset.
*
* RETURN VALUES:
* 0 - success
* -ENOMEM - insufficient free virtual memory.
* -EIO - i/o error.
*/
int diMount(struct inode *ipimap)
{
struct inomap *imap;
struct metapage *mp;
int index;
struct dinomap_disk *dinom_le;
/*
* allocate/initialize the in-memory inode map control structure
*/
/* allocate the in-memory inode map control structure. */
imap = (struct inomap *) kmalloc(sizeof(struct inomap), GFP_KERNEL);
if (imap == NULL) {
jfs_err("diMount: kmalloc returned NULL!");
return -ENOMEM;
}
/* read the on-disk inode map control structure. */
mp = read_metapage(ipimap,
IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
PSIZE, 0);
if (mp == NULL) {
kfree(imap);
return -EIO;
}
/* copy the on-disk version to the in-memory version. */
dinom_le = (struct dinomap_disk *) mp->data;
imap->im_freeiag = le32_to_cpu(dinom_le->in_freeiag);
imap->im_nextiag = le32_to_cpu(dinom_le->in_nextiag);
atomic_set(&imap->im_numinos, le32_to_cpu(dinom_le->in_numinos));
atomic_set(&imap->im_numfree, le32_to_cpu(dinom_le->in_numfree));
imap->im_nbperiext = le32_to_cpu(dinom_le->in_nbperiext);
imap->im_l2nbperiext = le32_to_cpu(dinom_le->in_l2nbperiext);
for (index = 0; index < MAXAG; index++) {
imap->im_agctl[index].inofree =
le32_to_cpu(dinom_le->in_agctl[index].inofree);
imap->im_agctl[index].extfree =
le32_to_cpu(dinom_le->in_agctl[index].extfree);
imap->im_agctl[index].numinos =
le32_to_cpu(dinom_le->in_agctl[index].numinos);
imap->im_agctl[index].numfree =
le32_to_cpu(dinom_le->in_agctl[index].numfree);
}
/* release the buffer. */
release_metapage(mp);
/*
* allocate/initialize inode allocation map locks
*/
/* allocate and init iag free list lock */
IAGFREE_LOCK_INIT(imap);
/* allocate and init ag list locks */
for (index = 0; index < MAXAG; index++) {
AG_LOCK_INIT(imap, index);
}
/* bind the inode map inode and inode map control structure
* to each other.
*/
imap->im_ipimap = ipimap;
JFS_IP(ipimap)->i_imap = imap;
return (0);
}
/*
* NAME: diUnmount()
*
* FUNCTION: write to disk the incore inode map control structures for
* a fileset or aggregate at unmount time.
*
* PARAMETERS:
* ipimap - pointer to inode map inode for the aggregate or fileset.
*
* RETURN VALUES:
* 0 - success
* -ENOMEM - insufficient free virtual memory.
* -EIO - i/o error.
*/
int diUnmount(struct inode *ipimap, int mounterror)
{
struct inomap *imap = JFS_IP(ipimap)->i_imap;
/*
* update the on-disk inode map control structure
*/
if (!(mounterror || isReadOnly(ipimap)))
diSync(ipimap);
/*
* Invalidate the page cache buffers
*/
truncate_inode_pages(ipimap->i_mapping, 0);
/*
* free in-memory control structure
*/
kfree(imap);
return (0);
}
/*
* diSync()
*/
int diSync(struct inode *ipimap)
{
struct dinomap_disk *dinom_le;
struct inomap *imp = JFS_IP(ipimap)->i_imap;
struct metapage *mp;
int index;
/*
* write imap global conrol page
*/
/* read the on-disk inode map control structure */
mp = get_metapage(ipimap,
IMAPBLKNO << JFS_SBI(ipimap->i_sb)->l2nbperpage,
PSIZE, 0);
if (mp == NULL) {
jfs_err("diSync: get_metapage failed!");
return -EIO;
}
/* copy the in-memory version to the on-disk version */
dinom_le = (struct dinomap_disk *) mp->data;
dinom_le->in_freeiag = cpu_to_le32(imp->im_freeiag);
dinom_le->in_nextiag = cpu_to_le32(imp->im_nextiag);
dinom_le->in_numinos = cpu_to_le32(atomic_read(&imp->im_numinos));
dinom_le->in_numfree = cpu_to_le32(atomic_read(&imp->im_numfree));
dinom_le->in_nbperiext = cpu_to_le32(imp->im_nbperiext);
dinom_le->in_l2nbperiext = cpu_to_le32(imp->im_l2nbperiext);
for (index = 0; index < MAXAG; index++) {
dinom_le->in_agctl[index].inofree =
cpu_to_le32(imp->im_agctl[index].inofree);
dinom_le->in_agctl[index].extfree =
cpu_to_le32(imp->im_agctl[index].extfree);
dinom_le->in_agctl[index].numinos =
cpu_to_le32(imp->im_agctl[index].numinos);
dinom_le->in_agctl[index].numfree =
cpu_to_le32(imp->im_agctl[index].numfree);
}
/* write out the control structure */
write_metapage(mp);
/*
* write out dirty pages of imap
*/
filemap_fdatawrite(ipimap->i_mapping);
filemap_fdatawait(ipimap->i_mapping);
diWriteSpecial(ipimap, 0);
return (0);
}
/*
* NAME: diRead()
*
* FUNCTION: initialize an incore inode from disk.
*
* on entry, the specifed incore inode should itself
* specify the disk inode number corresponding to the
* incore inode (i.e. i_number should be initialized).
*
* this routine handles incore inode initialization for
* both "special" and "regular" inodes. special inodes
* are those required early in the mount process and
* require special handling since much of the file system
* is not yet initialized. these "special" inodes are
* identified by a NULL inode map inode pointer and are
* actually initialized by a call to diReadSpecial().
*
* for regular inodes, the iag describing the disk inode
* is read from disk to determine the inode extent address
* for the disk inode. with the inode extent address in
* hand, the page of the extent that contains the disk
* inode is read and the disk inode is copied to the
* incore inode.
*
* PARAMETERS:
* ip - pointer to incore inode to be initialized from disk.
*
* RETURN VALUES:
* 0 - success
* -EIO - i/o error.
* -ENOMEM - insufficient memory
*
*/
int diRead(struct inode *ip)
{
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
int iagno, ino, extno, rc;
struct inode *ipimap;
struct dinode *dp;
struct iag *iagp;
struct metapage *mp;
s64 blkno, agstart;
struct inomap *imap;
int block_offset;
int inodes_left;
uint pageno;
int rel_inode;
jfs_info("diRead: ino = %ld", ip->i_ino);
ipimap = sbi->ipimap;
JFS_IP(ip)->ipimap = ipimap;
/* determine the iag number for this inode (number) */
iagno = INOTOIAG(ip->i_ino);
/* read the iag */
imap = JFS_IP(ipimap)->i_imap;
IREAD_LOCK(ipimap);
rc = diIAGRead(imap, iagno, &mp);
IREAD_UNLOCK(ipimap);
if (rc) {
jfs_err("diRead: diIAGRead returned %d", rc);
return (rc);
}
iagp = (struct iag *) mp->data;
/* determine inode extent that holds the disk inode */
ino = ip->i_ino & (INOSPERIAG - 1);
extno = ino >> L2INOSPEREXT;
if ((lengthPXD(&iagp->inoext[extno]) != imap->im_nbperiext) ||
(addressPXD(&iagp->inoext[extno]) == 0)) {
release_metapage(mp);
return -ESTALE;
}
/* get disk block number of the page within the inode extent
* that holds the disk inode.
*/
blkno = INOPBLK(&iagp->inoext[extno], ino, sbi->l2nbperpage);
/* get the ag for the iag */
agstart = le64_to_cpu(iagp->agstart);
release_metapage(mp);
rel_inode = (ino & (INOSPERPAGE - 1));
pageno = blkno >> sbi->l2nbperpage;
if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
/*
* OS/2 didn't always align inode extents on page boundaries
*/
inodes_left =
(sbi->nbperpage - block_offset) << sbi->l2niperblk;
if (rel_inode < inodes_left)
rel_inode += block_offset << sbi->l2niperblk;
else {
pageno += 1;
rel_inode -= inodes_left;
}
}
/* read the page of disk inode */
mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
if (mp == 0) {
jfs_err("diRead: read_metapage failed");
return -EIO;
}
/* locate the the disk inode requested */
dp = (struct dinode *) mp->data;
dp += rel_inode;
if (ip->i_ino != le32_to_cpu(dp->di_number)) {
jfs_error(ip->i_sb, "diRead: i_ino != di_number");
rc = -EIO;
} else if (le32_to_cpu(dp->di_nlink) == 0)
rc = -ESTALE;
else
/* copy the disk inode to the in-memory inode */
rc = copy_from_dinode(dp, ip);
release_metapage(mp);
/* set the ag for the inode */
JFS_IP(ip)->agno = BLKTOAG(agstart, sbi);
JFS_IP(ip)->active_ag = -1;
return (rc);
}
/*
* NAME: diReadSpecial()
*
* FUNCTION: initialize a 'special' inode from disk.
*
* this routines handles aggregate level inodes. The
* inode cache cannot differentiate between the
* aggregate inodes and the filesystem inodes, so we
* handle these here. We don't actually use the aggregate
* inode map, since these inodes are at a fixed location
* and in some cases the aggregate inode map isn't initialized
* yet.
*
* PARAMETERS:
* sb - filesystem superblock
* inum - aggregate inode number
* secondary - 1 if secondary aggregate inode table
*
* RETURN VALUES:
* new inode - success
* NULL - i/o error.
*/
struct inode *diReadSpecial(struct super_block *sb, ino_t inum, int secondary)
{
struct jfs_sb_info *sbi = JFS_SBI(sb);
uint address;
struct dinode *dp;
struct inode *ip;
struct metapage *mp;
ip = new_inode(sb);
if (ip == NULL) {
jfs_err("diReadSpecial: new_inode returned NULL!");
return ip;
}
if (secondary) {
address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
JFS_IP(ip)->ipimap = sbi->ipaimap2;
} else {
address = AITBL_OFF >> L2PSIZE;
JFS_IP(ip)->ipimap = sbi->ipaimap;
}
ASSERT(inum < INOSPEREXT);
ip->i_ino = inum;
address += inum >> 3; /* 8 inodes per 4K page */
/* read the page of fixed disk inode (AIT) in raw mode */
mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
if (mp == NULL) {
ip->i_nlink = 1; /* Don't want iput() deleting it */
iput(ip);
return (NULL);
}
/* get the pointer to the disk inode of interest */
dp = (struct dinode *) (mp->data);
dp += inum % 8; /* 8 inodes per 4K page */
/* copy on-disk inode to in-memory inode */
if ((copy_from_dinode(dp, ip)) != 0) {
/* handle bad return by returning NULL for ip */
ip->i_nlink = 1; /* Don't want iput() deleting it */
iput(ip);
/* release the page */
release_metapage(mp);
return (NULL);
}
ip->i_mapping->a_ops = &jfs_metapage_aops;
mapping_set_gfp_mask(ip->i_mapping, GFP_NOFS);
/* Allocations to metadata inodes should not affect quotas */
ip->i_flags |= S_NOQUOTA;
if ((inum == FILESYSTEM_I) && (JFS_IP(ip)->ipimap == sbi->ipaimap)) {
sbi->gengen = le32_to_cpu(dp->di_gengen);
sbi->inostamp = le32_to_cpu(dp->di_inostamp);
}
/* release the page */
release_metapage(mp);
hlist_add_head(&ip->i_hash, &aggregate_hash);
return (ip);
}
/*
* NAME: diWriteSpecial()
*
* FUNCTION: Write the special inode to disk
*
* PARAMETERS:
* ip - special inode
* secondary - 1 if secondary aggregate inode table
*
* RETURN VALUES: none
*/
void diWriteSpecial(struct inode *ip, int secondary)
{
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
uint address;
struct dinode *dp;
ino_t inum = ip->i_ino;
struct metapage *mp;
if (secondary)
address = addressPXD(&sbi->ait2) >> sbi->l2nbperpage;
else
address = AITBL_OFF >> L2PSIZE;
ASSERT(inum < INOSPEREXT);
address += inum >> 3; /* 8 inodes per 4K page */
/* read the page of fixed disk inode (AIT) in raw mode */
mp = read_metapage(ip, address << sbi->l2nbperpage, PSIZE, 1);
if (mp == NULL) {
jfs_err("diWriteSpecial: failed to read aggregate inode "
"extent!");
return;
}
/* get the pointer to the disk inode of interest */
dp = (struct dinode *) (mp->data);
dp += inum % 8; /* 8 inodes per 4K page */
/* copy on-disk inode to in-memory inode */
copy_to_dinode(dp, ip);
memcpy(&dp->di_xtroot, &JFS_IP(ip)->i_xtroot, 288);
if (inum == FILESYSTEM_I)
dp->di_gengen = cpu_to_le32(sbi->gengen);
/* write the page */
write_metapage(mp);
}
/*
* NAME: diFreeSpecial()
*
* FUNCTION: Free allocated space for special inode
*/
void diFreeSpecial(struct inode *ip)
{
if (ip == NULL) {
jfs_err("diFreeSpecial called with NULL ip!");
return;
}
filemap_fdatawrite(ip->i_mapping);
filemap_fdatawait(ip->i_mapping);
truncate_inode_pages(ip->i_mapping, 0);
iput(ip);
}
/*
* NAME: diWrite()
*
* FUNCTION: write the on-disk inode portion of the in-memory inode
* to its corresponding on-disk inode.
*
* on entry, the specifed incore inode should itself
* specify the disk inode number corresponding to the
* incore inode (i.e. i_number should be initialized).
*
* the inode contains the inode extent address for the disk
* inode. with the inode extent address in hand, the
* page of the extent that contains the disk inode is
* read and the disk inode portion of the incore inode
* is copied to the disk inode.
*
* PARAMETERS:
* tid - transacation id
* ip - pointer to incore inode to be written to the inode extent.
*
* RETURN VALUES:
* 0 - success
* -EIO - i/o error.
*/
int diWrite(tid_t tid, struct inode *ip)
{
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
int rc = 0;
s32 ino;
struct dinode *dp;
s64 blkno;
int block_offset;
int inodes_left;
struct metapage *mp;
uint pageno;
int rel_inode;
int dioffset;
struct inode *ipimap;
uint type;
lid_t lid;
struct tlock *ditlck, *tlck;
struct linelock *dilinelock, *ilinelock;
struct lv *lv;
int n;
ipimap = jfs_ip->ipimap;
ino = ip->i_ino & (INOSPERIAG - 1);
if (!addressPXD(&(jfs_ip->ixpxd)) ||
(lengthPXD(&(jfs_ip->ixpxd)) !=
JFS_IP(ipimap)->i_imap->im_nbperiext)) {
jfs_error(ip->i_sb, "diWrite: ixpxd invalid");
return -EIO;
}
/*
* read the page of disk inode containing the specified inode:
*/
/* compute the block address of the page */
blkno = INOPBLK(&(jfs_ip->ixpxd), ino, sbi->l2nbperpage);
rel_inode = (ino & (INOSPERPAGE - 1));
pageno = blkno >> sbi->l2nbperpage;
if ((block_offset = ((u32) blkno & (sbi->nbperpage - 1)))) {
/*
* OS/2 didn't always align inode extents on page boundaries
*/
inodes_left =
(sbi->nbperpage - block_offset) << sbi->l2niperblk;
if (rel_inode < inodes_left)
rel_inode += block_offset << sbi->l2niperblk;
else {
pageno += 1;
rel_inode -= inodes_left;
}
}
/* read the page of disk inode */
retry:
mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
if (mp == 0)
return -EIO;
/* get the pointer to the disk inode */
dp = (struct dinode *) mp->data;
dp += rel_inode;
dioffset = (ino & (INOSPERPAGE - 1)) << L2DISIZE;
/*
* acquire transaction lock on the on-disk inode;
* N.B. tlock is acquired on ipimap not ip;
*/
if ((ditlck =
txLock(tid, ipimap, mp, tlckINODE | tlckENTRY)) == NULL)
goto retry;
dilinelock = (struct linelock *) & ditlck->lock;
/*
* copy btree root from in-memory inode to on-disk inode
*
* (tlock is taken from inline B+-tree root in in-memory
* inode when the B+-tree root is updated, which is pointed
* by jfs_ip->blid as well as being on tx tlock list)
*
* further processing of btree root is based on the copy
* in in-memory inode, where txLog() will log from, and,
* for xtree root, txUpdateMap() will update map and reset
* XAD_NEW bit;
*/
if (S_ISDIR(ip->i_mode) && (lid = jfs_ip->xtlid)) {
/*
* This is the special xtree inside the directory for storing
* the directory table
*/
xtpage_t *p, *xp;
xad_t *xad;
jfs_ip->xtlid = 0;
tlck = lid_to_tlock(lid);
assert(tlck->type & tlckXTREE);
tlck->type |= tlckBTROOT;
tlck->mp = mp;
ilinelock = (struct linelock *) & tlck->lock;
/*
* copy xtree root from inode to dinode:
*/
p = &jfs_ip->i_xtroot;
xp = (xtpage_t *) &dp->di_dirtable;
lv = ilinelock->lv;
for (n = 0; n < ilinelock->index; n++, lv++) {
memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
lv->length << L2XTSLOTSIZE);
}
/* reset on-disk (metadata page) xtree XAD_NEW bit */
xad = &xp->xad[XTENTRYSTART];
for (n = XTENTRYSTART;
n < le16_to_cpu(xp->header.nextindex); n++, xad++)
if (xad->flag & (XAD_NEW | XAD_EXTENDED))
xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
}
if ((lid = jfs_ip->blid) == 0)
goto inlineData;
jfs_ip->blid = 0;
tlck = lid_to_tlock(lid);
type = tlck->type;
tlck->type |= tlckBTROOT;
tlck->mp = mp;
ilinelock = (struct linelock *) & tlck->lock;
/*
* regular file: 16 byte (XAD slot) granularity
*/
if (type & tlckXTREE) {
xtpage_t *p, *xp;
xad_t *xad;
/*
* copy xtree root from inode to dinode:
*/
p = &jfs_ip->i_xtroot;
xp = &dp->di_xtroot;
lv = ilinelock->lv;
for (n = 0; n < ilinelock->index; n++, lv++) {
memcpy(&xp->xad[lv->offset], &p->xad[lv->offset],
lv->length << L2XTSLOTSIZE);
}
/* reset on-disk (metadata page) xtree XAD_NEW bit */
xad = &xp->xad[XTENTRYSTART];
for (n = XTENTRYSTART;
n < le16_to_cpu(xp->header.nextindex); n++, xad++)
if (xad->flag & (XAD_NEW | XAD_EXTENDED))
xad->flag &= ~(XAD_NEW | XAD_EXTENDED);
}
/*
* directory: 32 byte (directory entry slot) granularity
*/
else if (type & tlckDTREE) {
dtpage_t *p, *xp;
/*
* copy dtree root from inode to dinode:
*/
p = (dtpage_t *) &jfs_ip->i_dtroot;
xp = (dtpage_t *) & dp->di_dtroot;
lv = ilinelock->lv;
for (n = 0; n < ilinelock->index; n++, lv++) {
memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
lv->length << L2DTSLOTSIZE);
}
} else {
jfs_err("diWrite: UFO tlock");
}
inlineData:
/*
* copy inline symlink from in-memory inode to on-disk inode
*/
if (S_ISLNK(ip->i_mode) && ip->i_size < IDATASIZE) {
lv = & dilinelock->lv[dilinelock->index];
lv->offset = (dioffset + 2 * 128) >> L2INODESLOTSIZE;
lv->length = 2;
memcpy(&dp->di_fastsymlink, jfs_ip->i_inline, IDATASIZE);
dilinelock->index++;
}
/*
* copy inline data from in-memory inode to on-disk inode:
* 128 byte slot granularity
*/
if (test_cflag(COMMIT_Inlineea, ip)) {
lv = & dilinelock->lv[dilinelock->index];
lv->offset = (dioffset + 3 * 128) >> L2INODESLOTSIZE;
lv->length = 1;
memcpy(&dp->di_inlineea, jfs_ip->i_inline_ea, INODESLOTSIZE);
dilinelock->index++;
clear_cflag(COMMIT_Inlineea, ip);
}
/*
* lock/copy inode base: 128 byte slot granularity
*/
// baseDinode:
lv = & dilinelock->lv[dilinelock->index];
lv->offset = dioffset >> L2INODESLOTSIZE;
copy_to_dinode(dp, ip);
if (test_and_clear_cflag(COMMIT_Dirtable, ip)) {
lv->length = 2;
memcpy(&dp->di_dirtable, &jfs_ip->i_dirtable, 96);
} else
lv->length = 1;
dilinelock->index++;
#ifdef _JFS_FASTDASD
/*
* We aren't logging changes to the DASD used in directory inodes,
* but we need to write them to disk. If we don't unmount cleanly,
* mount will recalculate the DASD used.
*/
if (S_ISDIR(ip->i_mode)
&& (ip->i_ipmnt->i_mntflag & JFS_DASD_ENABLED))
memcpy(&dp->di_DASD, &ip->i_DASD, sizeof(struct dasd));
#endif /* _JFS_FASTDASD */
/* release the buffer holding the updated on-disk inode.
* the buffer will be later written by commit processing.
*/
write_metapage(mp);
return (rc);
}
/*
* NAME: diFree(ip)
*
* FUNCTION: free a specified inode from the inode working map
* for a fileset or aggregate.
*
* if the inode to be freed represents the first (only)
* free inode within the iag, the iag will be placed on
* the ag free inode list.
*
* freeing the inode will cause the inode extent to be
* freed if the inode is the only allocated inode within
* the extent. in this case all the disk resource backing
* up the inode extent will be freed. in addition, the iag
* will be placed on the ag extent free list if the extent
* is the first free extent in the iag. if freeing the
* extent also means that no free inodes will exist for
* the iag, the iag will also be removed from the ag free
* inode list.
*
* the iag describing the inode will be freed if the extent
* is to be freed and it is the only backed extent within
* the iag. in this case, the iag will be removed from the
* ag free extent list and ag free inode list and placed on
* the inode map's free iag list.
*
* a careful update approach is used to provide consistency
* in the face of updates to multiple buffers. under this
* approach, all required buffers are obtained before making
* any updates and are held until all updates are complete.
*
* PARAMETERS:
* ip - inode to be freed.
*
* RETURN VALUES:
* 0 - success
* -EIO - i/o error.
*/
int diFree(struct inode *ip)
{
int rc;
ino_t inum = ip->i_ino;
struct iag *iagp, *aiagp, *biagp, *ciagp, *diagp;
struct metapage *mp, *amp, *bmp, *cmp, *dmp;
int iagno, ino, extno, bitno, sword, agno;
int back, fwd;
u32 bitmap, mask;
struct inode *ipimap = JFS_SBI(ip->i_sb)->ipimap;
struct inomap *imap = JFS_IP(ipimap)->i_imap;
pxd_t freepxd;
tid_t tid;
struct inode *iplist[3];
struct tlock *tlck;
struct pxd_lock *pxdlock;
/*
* This is just to suppress compiler warnings. The same logic that
* references these variables is used to initialize them.
*/
aiagp = biagp = ciagp = diagp = NULL;
/* get the iag number containing the inode.
*/
iagno = INOTOIAG(inum);
/* make sure that the iag is contained within
* the map.
*/
if (iagno >= imap->im_nextiag) {
dump_mem("imap", imap, 32);
jfs_error(ip->i_sb,
"diFree: inum = %d, iagno = %d, nextiag = %d",
(uint) inum, iagno, imap->im_nextiag);
return -EIO;
}
/* get the allocation group for this ino.
*/
agno = JFS_IP(ip)->agno;
/* Lock the AG specific inode map information
*/
AG_LOCK(imap, agno);
/* Obtain read lock in imap inode. Don't release it until we have
* read all of the IAG's that we are going to.
*/
IREAD_LOCK(ipimap);
/* read the iag.
*/
if ((rc = diIAGRead(imap, iagno, &mp))) {
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
return (rc);
}
iagp = (struct iag *) mp->data;
/* get the inode number and extent number of the inode within
* the iag and the inode number within the extent.
*/
ino = inum & (INOSPERIAG - 1);
extno = ino >> L2INOSPEREXT;
bitno = ino & (INOSPEREXT - 1);
mask = HIGHORDER >> bitno;
if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
jfs_error(ip->i_sb,
"diFree: wmap shows inode already free");
}
if (!addressPXD(&iagp->inoext[extno])) {
release_metapage(mp);
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
jfs_error(ip->i_sb, "diFree: invalid inoext");
return -EIO;
}
/* compute the bitmap for the extent reflecting the freed inode.
*/
bitmap = le32_to_cpu(iagp->wmap[extno]) & ~mask;
if (imap->im_agctl[agno].numfree > imap->im_agctl[agno].numinos) {
release_metapage(mp);
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
jfs_error(ip->i_sb, "diFree: numfree > numinos");
return -EIO;
}
/*
* inode extent still has some inodes or below low water mark:
* keep the inode extent;
*/
if (bitmap ||
imap->im_agctl[agno].numfree < 96 ||
(imap->im_agctl[agno].numfree < 288 &&
(((imap->im_agctl[agno].numfree * 100) /
imap->im_agctl[agno].numinos) <= 25))) {
/* if the iag currently has no free inodes (i.e.,
* the inode being freed is the first free inode of iag),
* insert the iag at head of the inode free list for the ag.
*/
if (iagp->nfreeinos == 0) {
/* check if there are any iags on the ag inode
* free list. if so, read the first one so that
* we can link the current iag onto the list at
* the head.
*/
if ((fwd = imap->im_agctl[agno].inofree) >= 0) {
/* read the iag that currently is the head
* of the list.
*/
if ((rc = diIAGRead(imap, fwd, &amp))) {
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
release_metapage(mp);
return (rc);
}
aiagp = (struct iag *) amp->data;
/* make current head point back to the iag.
*/
aiagp->inofreeback = cpu_to_le32(iagno);
write_metapage(amp);
}
/* iag points forward to current head and iag
* becomes the new head of the list.
*/
iagp->inofreefwd =
cpu_to_le32(imap->im_agctl[agno].inofree);
iagp->inofreeback = cpu_to_le32(-1);
imap->im_agctl[agno].inofree = iagno;
}
IREAD_UNLOCK(ipimap);
/* update the free inode summary map for the extent if
* freeing the inode means the extent will now have free
* inodes (i.e., the inode being freed is the first free
* inode of extent),
*/
if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
sword = extno >> L2EXTSPERSUM;
bitno = extno & (EXTSPERSUM - 1);
iagp->inosmap[sword] &=
cpu_to_le32(~(HIGHORDER >> bitno));
}
/* update the bitmap.
*/
iagp->wmap[extno] = cpu_to_le32(bitmap);
/* update the free inode counts at the iag, ag and
* map level.
*/
iagp->nfreeinos =
cpu_to_le32(le32_to_cpu(iagp->nfreeinos) + 1);
imap->im_agctl[agno].numfree += 1;
atomic_inc(&imap->im_numfree);
/* release the AG inode map lock
*/
AG_UNLOCK(imap, agno);
/* write the iag */
write_metapage(mp);
return (0);
}
/*
* inode extent has become free and above low water mark:
* free the inode extent;
*/
/*
* prepare to update iag list(s) (careful update step 1)
*/
amp = bmp = cmp = dmp = NULL;
fwd = back = -1;
/* check if the iag currently has no free extents. if so,
* it will be placed on the head of the ag extent free list.
*/
if (iagp->nfreeexts == 0) {
/* check if the ag extent free list has any iags.
* if so, read the iag at the head of the list now.
* this (head) iag will be updated later to reflect
* the addition of the current iag at the head of
* the list.
*/
if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
if ((rc = diIAGRead(imap, fwd, &amp)))
goto error_out;
aiagp = (struct iag *) amp->data;
}
} else {
/* iag has free extents. check if the addition of a free
* extent will cause all extents to be free within this
* iag. if so, the iag will be removed from the ag extent
* free list and placed on the inode map's free iag list.
*/
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
/* in preparation for removing the iag from the
* ag extent free list, read the iags preceeding
* and following the iag on the ag extent free
* list.
*/
if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
if ((rc = diIAGRead(imap, fwd, &amp)))
goto error_out;
aiagp = (struct iag *) amp->data;
}
if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
if ((rc = diIAGRead(imap, back, &bmp)))
goto error_out;
biagp = (struct iag *) bmp->data;
}
}
}
/* remove the iag from the ag inode free list if freeing
* this extent cause the iag to have no free inodes.
*/
if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
int inofreeback = le32_to_cpu(iagp->inofreeback);
int inofreefwd = le32_to_cpu(iagp->inofreefwd);
/* in preparation for removing the iag from the
* ag inode free list, read the iags preceeding
* and following the iag on the ag inode free
* list. before reading these iags, we must make
* sure that we already don't have them in hand
* from up above, since re-reading an iag (buffer)
* we are currently holding would cause a deadlock.
*/
if (inofreefwd >= 0) {
if (inofreefwd == fwd)
ciagp = (struct iag *) amp->data;
else if (inofreefwd == back)
ciagp = (struct iag *) bmp->data;
else {
if ((rc =
diIAGRead(imap, inofreefwd, &cmp)))
goto error_out;
ciagp = (struct iag *) cmp->data;
}
assert(ciagp != NULL);
}
if (inofreeback >= 0) {
if (inofreeback == fwd)
diagp = (struct iag *) amp->data;
else if (inofreeback == back)
diagp = (struct iag *) bmp->data;
else {
if ((rc =
diIAGRead(imap, inofreeback, &dmp)))
goto error_out;
diagp = (struct iag *) dmp->data;
}
assert(diagp != NULL);
}
}
IREAD_UNLOCK(ipimap);
/*
* invalidate any page of the inode extent freed from buffer cache;
*/
freepxd = iagp->inoext[extno];
invalidate_pxd_metapages(ip, freepxd);
/*
* update iag list(s) (careful update step 2)
*/
/* add the iag to the ag extent free list if this is the
* first free extent for the iag.
*/
if (iagp->nfreeexts == 0) {
if (fwd >= 0)
aiagp->extfreeback = cpu_to_le32(iagno);
iagp->extfreefwd =
cpu_to_le32(imap->im_agctl[agno].extfree);
iagp->extfreeback = cpu_to_le32(-1);
imap->im_agctl[agno].extfree = iagno;
} else {
/* remove the iag from the ag extent list if all extents
* are now free and place it on the inode map iag free list.
*/
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG - 1)) {
if (fwd >= 0)
aiagp->extfreeback = iagp->extfreeback;
if (back >= 0)
biagp->extfreefwd = iagp->extfreefwd;
else
imap->im_agctl[agno].extfree =
le32_to_cpu(iagp->extfreefwd);
iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
IAGFREE_LOCK(imap);
iagp->iagfree = cpu_to_le32(imap->im_freeiag);
imap->im_freeiag = iagno;
IAGFREE_UNLOCK(imap);
}
}
/* remove the iag from the ag inode free list if freeing
* this extent causes the iag to have no free inodes.
*/
if (iagp->nfreeinos == cpu_to_le32(INOSPEREXT - 1)) {
if ((int) le32_to_cpu(iagp->inofreefwd) >= 0)
ciagp->inofreeback = iagp->inofreeback;
if ((int) le32_to_cpu(iagp->inofreeback) >= 0)
diagp->inofreefwd = iagp->inofreefwd;
else
imap->im_agctl[agno].inofree =
le32_to_cpu(iagp->inofreefwd);
iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
}
/* update the inode extent address and working map
* to reflect the free extent.
* the permanent map should have been updated already
* for the inode being freed.
*/
if (iagp->pmap[extno] != 0) {
jfs_error(ip->i_sb, "diFree: the pmap does not show inode free");
}
iagp->wmap[extno] = 0;
PXDlength(&iagp->inoext[extno], 0);
PXDaddress(&iagp->inoext[extno], 0);
/* update the free extent and free inode summary maps
* to reflect the freed extent.
* the inode summary map is marked to indicate no inodes
* available for the freed extent.
*/
sword = extno >> L2EXTSPERSUM;
bitno = extno & (EXTSPERSUM - 1);
mask = HIGHORDER >> bitno;
iagp->inosmap[sword] |= cpu_to_le32(mask);
iagp->extsmap[sword] &= cpu_to_le32(~mask);
/* update the number of free inodes and number of free extents
* for the iag.
*/
iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) -
(INOSPEREXT - 1));
iagp->nfreeexts = cpu_to_le32(le32_to_cpu(iagp->nfreeexts) + 1);
/* update the number of free inodes and backed inodes
* at the ag and inode map level.
*/
imap->im_agctl[agno].numfree -= (INOSPEREXT - 1);
imap->im_agctl[agno].numinos -= INOSPEREXT;
atomic_sub(INOSPEREXT - 1, &imap->im_numfree);
atomic_sub(INOSPEREXT, &imap->im_numinos);
if (amp)
write_metapage(amp);
if (bmp)
write_metapage(bmp);
if (cmp)
write_metapage(cmp);
if (dmp)
write_metapage(dmp);
/*
* start transaction to update block allocation map
* for the inode extent freed;
*
* N.B. AG_LOCK is released and iag will be released below, and
* other thread may allocate inode from/reusing the ixad freed
* BUT with new/different backing inode extent from the extent
* to be freed by the transaction;
*/
tid = txBegin(ipimap->i_sb, COMMIT_FORCE);
down(&JFS_IP(ipimap)->commit_sem);
/* acquire tlock of the iag page of the freed ixad
* to force the page NOHOMEOK (even though no data is
* logged from the iag page) until NOREDOPAGE|FREEXTENT log
* for the free of the extent is committed;
* write FREEXTENT|NOREDOPAGE log record
* N.B. linelock is overlaid as freed extent descriptor;
*/
tlck = txLock(tid, ipimap, mp, tlckINODE | tlckFREE);
pxdlock = (struct pxd_lock *) & tlck->lock;
pxdlock->flag = mlckFREEPXD;
pxdlock->pxd = freepxd;
pxdlock->index = 1;
write_metapage(mp);
iplist[0] = ipimap;
/*
* logredo needs the IAG number and IAG extent index in order
* to ensure that the IMap is consistent. The least disruptive
* way to pass these values through to the transaction manager
* is in the iplist array.
*
* It's not pretty, but it works.
*/
iplist[1] = (struct inode *) (size_t)iagno;
iplist[2] = (struct inode *) (size_t)extno;
rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
txEnd(tid);
up(&JFS_IP(ipimap)->commit_sem);
/* unlock the AG inode map information */
AG_UNLOCK(imap, agno);
return (0);
error_out:
IREAD_UNLOCK(ipimap);
if (amp)
release_metapage(amp);
if (bmp)
release_metapage(bmp);
if (cmp)
release_metapage(cmp);
if (dmp)
release_metapage(dmp);
AG_UNLOCK(imap, agno);
release_metapage(mp);
return (rc);
}
/*
* There are several places in the diAlloc* routines where we initialize
* the inode.
*/
static inline void
diInitInode(struct inode *ip, int iagno, int ino, int extno, struct iag * iagp)
{
struct jfs_sb_info *sbi = JFS_SBI(ip->i_sb);
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
ip->i_ino = (iagno << L2INOSPERIAG) + ino;
jfs_ip->ixpxd = iagp->inoext[extno];
jfs_ip->agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
jfs_ip->active_ag = -1;
}
/*
* NAME: diAlloc(pip,dir,ip)
*
* FUNCTION: allocate a disk inode from the inode working map
* for a fileset or aggregate.
*
* PARAMETERS:
* pip - pointer to incore inode for the parent inode.
* dir - TRUE if the new disk inode is for a directory.
* ip - pointer to a new inode
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
int diAlloc(struct inode *pip, boolean_t dir, struct inode *ip)
{
int rc, ino, iagno, addext, extno, bitno, sword;
int nwords, rem, i, agno;
u32 mask, inosmap, extsmap;
struct inode *ipimap;
struct metapage *mp;
ino_t inum;
struct iag *iagp;
struct inomap *imap;
/* get the pointers to the inode map inode and the
* corresponding imap control structure.
*/
ipimap = JFS_SBI(pip->i_sb)->ipimap;
imap = JFS_IP(ipimap)->i_imap;
JFS_IP(ip)->ipimap = ipimap;
JFS_IP(ip)->fileset = FILESYSTEM_I;
/* for a directory, the allocation policy is to start
* at the ag level using the preferred ag.
*/
if (dir == TRUE) {
agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
AG_LOCK(imap, agno);
goto tryag;
}
/* for files, the policy starts off by trying to allocate from
* the same iag containing the parent disk inode:
* try to allocate the new disk inode close to the parent disk
* inode, using parent disk inode number + 1 as the allocation
* hint. (we use a left-to-right policy to attempt to avoid
* moving backward on the disk.) compute the hint within the
* file system and the iag.
*/
/* get the ag number of this iag */
agno = JFS_IP(pip)->agno;
if (atomic_read(&JFS_SBI(pip->i_sb)->bmap->db_active[agno])) {
/*
* There is an open file actively growing. We want to
* allocate new inodes from a different ag to avoid
* fragmentation problems.
*/
agno = dbNextAG(JFS_SBI(pip->i_sb)->ipbmap);
AG_LOCK(imap, agno);
goto tryag;
}
inum = pip->i_ino + 1;
ino = inum & (INOSPERIAG - 1);
/* back off the the hint if it is outside of the iag */
if (ino == 0)
inum = pip->i_ino;
/* lock the AG inode map information */
AG_LOCK(imap, agno);
/* Get read lock on imap inode */
IREAD_LOCK(ipimap);
/* get the iag number and read the iag */
iagno = INOTOIAG(inum);
if ((rc = diIAGRead(imap, iagno, &mp))) {
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
return (rc);
}
iagp = (struct iag *) mp->data;
/* determine if new inode extent is allowed to be added to the iag.
* new inode extent can be added to the iag if the ag
* has less than 32 free disk inodes and the iag has free extents.
*/
addext = (imap->im_agctl[agno].numfree < 32 && iagp->nfreeexts);
/*
* try to allocate from the IAG
*/
/* check if the inode may be allocated from the iag
* (i.e. the inode has free inodes or new extent can be added).
*/
if (iagp->nfreeinos || addext) {
/* determine the extent number of the hint.
*/
extno = ino >> L2INOSPEREXT;
/* check if the extent containing the hint has backed
* inodes. if so, try to allocate within this extent.
*/
if (addressPXD(&iagp->inoext[extno])) {
bitno = ino & (INOSPEREXT - 1);
if ((bitno =
diFindFree(le32_to_cpu(iagp->wmap[extno]),
bitno))
< INOSPEREXT) {
ino = (extno << L2INOSPEREXT) + bitno;
/* a free inode (bit) was found within this
* extent, so allocate it.
*/
rc = diAllocBit(imap, iagp, ino);
IREAD_UNLOCK(ipimap);
if (rc) {
assert(rc == -EIO);
} else {
/* set the results of the allocation
* and write the iag.
*/
diInitInode(ip, iagno, ino, extno,
iagp);
mark_metapage_dirty(mp);
}
release_metapage(mp);
/* free the AG lock and return.
*/
AG_UNLOCK(imap, agno);
return (rc);
}
if (!addext)
extno =
(extno ==
EXTSPERIAG - 1) ? 0 : extno + 1;
}
/*
* no free inodes within the extent containing the hint.
*
* try to allocate from the backed extents following
* hint or, if appropriate (i.e. addext is true), allocate
* an extent of free inodes at or following the extent
* containing the hint.
*
* the free inode and free extent summary maps are used
* here, so determine the starting summary map position
* and the number of words we'll have to examine. again,
* the approach is to allocate following the hint, so we
* might have to initially ignore prior bits of the summary
* map that represent extents prior to the extent containing
* the hint and later revisit these bits.
*/
bitno = extno & (EXTSPERSUM - 1);
nwords = (bitno == 0) ? SMAPSZ : SMAPSZ + 1;
sword = extno >> L2EXTSPERSUM;
/* mask any prior bits for the starting words of the
* summary map.
*/
mask = ONES << (EXTSPERSUM - bitno);
inosmap = le32_to_cpu(iagp->inosmap[sword]) | mask;
extsmap = le32_to_cpu(iagp->extsmap[sword]) | mask;
/* scan the free inode and free extent summary maps for
* free resources.
*/
for (i = 0; i < nwords; i++) {
/* check if this word of the free inode summary
* map describes an extent with free inodes.
*/
if (~inosmap) {
/* an extent with free inodes has been
* found. determine the extent number
* and the inode number within the extent.
*/
rem = diFindFree(inosmap, 0);
extno = (sword << L2EXTSPERSUM) + rem;
rem = diFindFree(le32_to_cpu(iagp->wmap[extno]),
0);
if (rem >= INOSPEREXT) {
IREAD_UNLOCK(ipimap);
release_metapage(mp);
AG_UNLOCK(imap, agno);
jfs_error(ip->i_sb,
"diAlloc: can't find free bit "
"in wmap");
return EIO;
}
/* determine the inode number within the
* iag and allocate the inode from the
* map.
*/
ino = (extno << L2INOSPEREXT) + rem;
rc = diAllocBit(imap, iagp, ino);
IREAD_UNLOCK(ipimap);
if (rc)
assert(rc == -EIO);
else {
/* set the results of the allocation
* and write the iag.
*/
diInitInode(ip, iagno, ino, extno,
iagp);
mark_metapage_dirty(mp);
}
release_metapage(mp);
/* free the AG lock and return.
*/
AG_UNLOCK(imap, agno);
return (rc);
}
/* check if we may allocate an extent of free
* inodes and whether this word of the free
* extents summary map describes a free extent.
*/
if (addext && ~extsmap) {
/* a free extent has been found. determine
* the extent number.
*/
rem = diFindFree(extsmap, 0);
extno = (sword << L2EXTSPERSUM) + rem;
/* allocate an extent of free inodes.
*/
if ((rc = diNewExt(imap, iagp, extno))) {
/* if there is no disk space for a
* new extent, try to allocate the
* disk inode from somewhere else.
*/
if (rc == -ENOSPC)
break;
assert(rc == -EIO);
} else {
/* set the results of the allocation
* and write the iag.
*/
diInitInode(ip, iagno,
extno << L2INOSPEREXT,
extno, iagp);
mark_metapage_dirty(mp);
}
release_metapage(mp);
/* free the imap inode & the AG lock & return.
*/
IREAD_UNLOCK(ipimap);
AG_UNLOCK(imap, agno);
return (rc);
}
/* move on to the next set of summary map words.
*/
sword = (sword == SMAPSZ - 1) ? 0 : sword + 1;
inosmap = le32_to_cpu(iagp->inosmap[sword]);
extsmap = le32_to_cpu(iagp->extsmap[sword]);
}
}
/* unlock imap inode */
IREAD_UNLOCK(ipimap);
/* nothing doing in this iag, so release it. */
release_metapage(mp);
tryag:
/*
* try to allocate anywhere within the same AG as the parent inode.
*/
rc = diAllocAG(imap, agno, dir, ip);
AG_UNLOCK(imap, agno);
if (rc != -ENOSPC)
return (rc);
/*
* try to allocate in any AG.
*/
return (diAllocAny(imap, agno, dir, ip));
}
/*
* NAME: diAllocAG(imap,agno,dir,ip)
*
* FUNCTION: allocate a disk inode from the allocation group.
*
* this routine first determines if a new extent of free
* inodes should be added for the allocation group, with
* the current request satisfied from this extent. if this
* is the case, an attempt will be made to do just that. if
* this attempt fails or it has been determined that a new
* extent should not be added, an attempt is made to satisfy
* the request by allocating an existing (backed) free inode
* from the allocation group.
*
* PRE CONDITION: Already have the AG lock for this AG.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* agno - allocation group to allocate from.
* dir - TRUE if the new disk inode is for a directory.
* ip - pointer to the new inode to be filled in on successful return
* with the disk inode number allocated, its extent address
* and the start of the ag.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int
diAllocAG(struct inomap * imap, int agno, boolean_t dir, struct inode *ip)
{
int rc, addext, numfree, numinos;
/* get the number of free and the number of backed disk
* inodes currently within the ag.
*/
numfree = imap->im_agctl[agno].numfree;
numinos = imap->im_agctl[agno].numinos;
if (numfree > numinos) {
jfs_error(ip->i_sb, "diAllocAG: numfree > numinos");
return -EIO;
}
/* determine if we should allocate a new extent of free inodes
* within the ag: for directory inodes, add a new extent
* if there are a small number of free inodes or number of free
* inodes is a small percentage of the number of backed inodes.
*/
if (dir == TRUE)
addext = (numfree < 64 ||
(numfree < 256
&& ((numfree * 100) / numinos) <= 20));
else
addext = (numfree == 0);
/*
* try to allocate a new extent of free inodes.
*/
if (addext) {
/* if free space is not avaliable for this new extent, try
* below to allocate a free and existing (already backed)
* inode from the ag.
*/
if ((rc = diAllocExt(imap, agno, ip)) != -ENOSPC)
return (rc);
}
/*
* try to allocate an existing free inode from the ag.
*/
return (diAllocIno(imap, agno, ip));
}
/*
* NAME: diAllocAny(imap,agno,dir,iap)
*
* FUNCTION: allocate a disk inode from any other allocation group.
*
* this routine is called when an allocation attempt within
* the primary allocation group has failed. if attempts to
* allocate an inode from any allocation group other than the
* specified primary group.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* agno - primary allocation group (to avoid).
* dir - TRUE if the new disk inode is for a directory.
* ip - pointer to a new inode to be filled in on successful return
* with the disk inode number allocated, its extent address
* and the start of the ag.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int
diAllocAny(struct inomap * imap, int agno, boolean_t dir, struct inode *ip)
{
int ag, rc;
int maxag = JFS_SBI(imap->im_ipimap->i_sb)->bmap->db_maxag;
/* try to allocate from the ags following agno up to
* the maximum ag number.
*/
for (ag = agno + 1; ag <= maxag; ag++) {
AG_LOCK(imap, ag);
rc = diAllocAG(imap, ag, dir, ip);
AG_UNLOCK(imap, ag);
if (rc != -ENOSPC)
return (rc);
}
/* try to allocate from the ags in front of agno.
*/
for (ag = 0; ag < agno; ag++) {
AG_LOCK(imap, ag);
rc = diAllocAG(imap, ag, dir, ip);
AG_UNLOCK(imap, ag);
if (rc != -ENOSPC)
return (rc);
}
/* no free disk inodes.
*/
return -ENOSPC;
}
/*
* NAME: diAllocIno(imap,agno,ip)
*
* FUNCTION: allocate a disk inode from the allocation group's free
* inode list, returning an error if this free list is
* empty (i.e. no iags on the list).
*
* allocation occurs from the first iag on the list using
* the iag's free inode summary map to find the leftmost
* free inode in the iag.
*
* PRE CONDITION: Already have AG lock for this AG.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* agno - allocation group.
* ip - pointer to new inode to be filled in on successful return
* with the disk inode number allocated, its extent address
* and the start of the ag.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int diAllocIno(struct inomap * imap, int agno, struct inode *ip)
{
int iagno, ino, rc, rem, extno, sword;
struct metapage *mp;
struct iag *iagp;
/* check if there are iags on the ag's free inode list.
*/
if ((iagno = imap->im_agctl[agno].inofree) < 0)
return -ENOSPC;
/* obtain read lock on imap inode */
IREAD_LOCK(imap->im_ipimap);
/* read the iag at the head of the list.
*/
if ((rc = diIAGRead(imap, iagno, &mp))) {
IREAD_UNLOCK(imap->im_ipimap);
return (rc);
}
iagp = (struct iag *) mp->data;
/* better be free inodes in this iag if it is on the
* list.
*/
if (!iagp->nfreeinos) {
IREAD_UNLOCK(imap->im_ipimap);
release_metapage(mp);
jfs_error(ip->i_sb,
"diAllocIno: nfreeinos = 0, but iag on freelist");
return -EIO;
}
/* scan the free inode summary map to find an extent
* with free inodes.
*/
for (sword = 0;; sword++) {
if (sword >= SMAPSZ) {
IREAD_UNLOCK(imap->im_ipimap);
release_metapage(mp);
jfs_error(ip->i_sb,
"diAllocIno: free inode not found in summary map");
return -EIO;
}
if (~iagp->inosmap[sword])
break;
}
/* found a extent with free inodes. determine
* the extent number.
*/
rem = diFindFree(le32_to_cpu(iagp->inosmap[sword]), 0);
if (rem >= EXTSPERSUM) {
IREAD_UNLOCK(imap->im_ipimap);
release_metapage(mp);
jfs_error(ip->i_sb, "diAllocIno: no free extent found");
return -EIO;
}
extno = (sword << L2EXTSPERSUM) + rem;
/* find the first free inode in the extent.
*/
rem = diFindFree(le32_to_cpu(iagp->wmap[extno]), 0);
if (rem >= INOSPEREXT) {
IREAD_UNLOCK(imap->im_ipimap);
release_metapage(mp);
jfs_error(ip->i_sb, "diAllocIno: free inode not found");
return -EIO;
}
/* compute the inode number within the iag.
*/
ino = (extno << L2INOSPEREXT) + rem;
/* allocate the inode.
*/
rc = diAllocBit(imap, iagp, ino);
IREAD_UNLOCK(imap->im_ipimap);
if (rc) {
release_metapage(mp);
return (rc);
}
/* set the results of the allocation and write the iag.
*/
diInitInode(ip, iagno, ino, extno, iagp);
write_metapage(mp);
return (0);
}
/*
* NAME: diAllocExt(imap,agno,ip)
*
* FUNCTION: add a new extent of free inodes to an iag, allocating
* an inode from this extent to satisfy the current allocation
* request.
*
* this routine first tries to find an existing iag with free
* extents through the ag free extent list. if list is not
* empty, the head of the list will be selected as the home
* of the new extent of free inodes. otherwise (the list is
* empty), a new iag will be allocated for the ag to contain
* the extent.
*
* once an iag has been selected, the free extent summary map
* is used to locate a free extent within the iag and diNewExt()
* is called to initialize the extent, with initialization
* including the allocation of the first inode of the extent
* for the purpose of satisfying this request.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* agno - allocation group number.
* ip - pointer to new inode to be filled in on successful return
* with the disk inode number allocated, its extent address
* and the start of the ag.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int diAllocExt(struct inomap * imap, int agno, struct inode *ip)
{
int rem, iagno, sword, extno, rc;
struct metapage *mp;
struct iag *iagp;
/* check if the ag has any iags with free extents. if not,
* allocate a new iag for the ag.
*/
if ((iagno = imap->im_agctl[agno].extfree) < 0) {
/* If successful, diNewIAG will obtain the read lock on the
* imap inode.
*/
if ((rc = diNewIAG(imap, &iagno, agno, &mp))) {
return (rc);
}
iagp = (struct iag *) mp->data;
/* set the ag number if this a brand new iag
*/
iagp->agstart =
cpu_to_le64(AGTOBLK(agno, imap->im_ipimap));
} else {
/* read the iag.
*/
IREAD_LOCK(imap->im_ipimap);
if ((rc = diIAGRead(imap, iagno, &mp))) {
IREAD_UNLOCK(imap->im_ipimap);
jfs_error(ip->i_sb, "diAllocExt: error reading iag");
return rc;
}
iagp = (struct iag *) mp->data;
}
/* using the free extent summary map, find a free extent.
*/
for (sword = 0;; sword++) {
if (sword >= SMAPSZ) {
release_metapage(mp);
IREAD_UNLOCK(imap->im_ipimap);
jfs_error(ip->i_sb,
"diAllocExt: free ext summary map not found");
return -EIO;
}
if (~iagp->extsmap[sword])
break;
}
/* determine the extent number of the free extent.
*/
rem = diFindFree(le32_to_cpu(iagp->extsmap[sword]), 0);
if (rem >= EXTSPERSUM) {
release_metapage(mp);
IREAD_UNLOCK(imap->im_ipimap);
jfs_error(ip->i_sb, "diAllocExt: free extent not found");
return -EIO;
}
extno = (sword << L2EXTSPERSUM) + rem;
/* initialize the new extent.
*/
rc = diNewExt(imap, iagp, extno);
IREAD_UNLOCK(imap->im_ipimap);
if (rc) {
/* something bad happened. if a new iag was allocated,
* place it back on the inode map's iag free list, and
* clear the ag number information.
*/
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
IAGFREE_LOCK(imap);
iagp->iagfree = cpu_to_le32(imap->im_freeiag);
imap->im_freeiag = iagno;
IAGFREE_UNLOCK(imap);
}
write_metapage(mp);
return (rc);
}
/* set the results of the allocation and write the iag.
*/
diInitInode(ip, iagno, extno << L2INOSPEREXT, extno, iagp);
write_metapage(mp);
return (0);
}
/*
* NAME: diAllocBit(imap,iagp,ino)
*
* FUNCTION: allocate a backed inode from an iag.
*
* this routine performs the mechanics of allocating a
* specified inode from a backed extent.
*
* if the inode to be allocated represents the last free
* inode within the iag, the iag will be removed from the
* ag free inode list.
*
* a careful update approach is used to provide consistency
* in the face of updates to multiple buffers. under this
* approach, all required buffers are obtained before making
* any updates and are held all are updates are complete.
*
* PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
* this AG. Must have read lock on imap inode.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* iagp - pointer to iag.
* ino - inode number to be allocated within the iag.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int diAllocBit(struct inomap * imap, struct iag * iagp, int ino)
{
int extno, bitno, agno, sword, rc;
struct metapage *amp = NULL, *bmp = NULL;
struct iag *aiagp = NULL, *biagp = NULL;
u32 mask;
/* check if this is the last free inode within the iag.
* if so, it will have to be removed from the ag free
* inode list, so get the iags preceeding and following
* it on the list.
*/
if (iagp->nfreeinos == cpu_to_le32(1)) {
if ((int) le32_to_cpu(iagp->inofreefwd) >= 0) {
if ((rc =
diIAGRead(imap, le32_to_cpu(iagp->inofreefwd),
&amp)))
return (rc);
aiagp = (struct iag *) amp->data;
}
if ((int) le32_to_cpu(iagp->inofreeback) >= 0) {
if ((rc =
diIAGRead(imap,
le32_to_cpu(iagp->inofreeback),
&bmp))) {
if (amp)
release_metapage(amp);
return (rc);
}
biagp = (struct iag *) bmp->data;
}
}
/* get the ag number, extent number, inode number within
* the extent.
*/
agno = BLKTOAG(le64_to_cpu(iagp->agstart), JFS_SBI(imap->im_ipimap->i_sb));
extno = ino >> L2INOSPEREXT;
bitno = ino & (INOSPEREXT - 1);
/* compute the mask for setting the map.
*/
mask = HIGHORDER >> bitno;
/* the inode should be free and backed.
*/
if (((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) ||
((le32_to_cpu(iagp->wmap[extno]) & mask) != 0) ||
(addressPXD(&iagp->inoext[extno]) == 0)) {
if (amp)
release_metapage(amp);
if (bmp)
release_metapage(bmp);
jfs_error(imap->im_ipimap->i_sb,
"diAllocBit: iag inconsistent");
return -EIO;
}
/* mark the inode as allocated in the working map.
*/
iagp->wmap[extno] |= cpu_to_le32(mask);
/* check if all inodes within the extent are now
* allocated. if so, update the free inode summary
* map to reflect this.
*/
if (iagp->wmap[extno] == cpu_to_le32(ONES)) {
sword = extno >> L2EXTSPERSUM;
bitno = extno & (EXTSPERSUM - 1);
iagp->inosmap[sword] |= cpu_to_le32(HIGHORDER >> bitno);
}
/* if this was the last free inode in the iag, remove the
* iag from the ag free inode list.
*/
if (iagp->nfreeinos == cpu_to_le32(1)) {
if (amp) {
aiagp->inofreeback = iagp->inofreeback;
write_metapage(amp);
}
if (bmp) {
biagp->inofreefwd = iagp->inofreefwd;
write_metapage(bmp);
} else {
imap->im_agctl[agno].inofree =
le32_to_cpu(iagp->inofreefwd);
}
iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
}
/* update the free inode count at the iag, ag, inode
* map levels.
*/
iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) - 1);
imap->im_agctl[agno].numfree -= 1;
atomic_dec(&imap->im_numfree);
return (0);
}
/*
* NAME: diNewExt(imap,iagp,extno)
*
* FUNCTION: initialize a new extent of inodes for an iag, allocating
* the first inode of the extent for use for the current
* allocation request.
*
* disk resources are allocated for the new extent of inodes
* and the inodes themselves are initialized to reflect their
* existence within the extent (i.e. their inode numbers and
* inode extent addresses are set) and their initial state
* (mode and link count are set to zero).
*
* if the iag is new, it is not yet on an ag extent free list
* but will now be placed on this list.
*
* if the allocation of the new extent causes the iag to
* have no free extent, the iag will be removed from the
* ag extent free list.
*
* if the iag has no free backed inodes, it will be placed
* on the ag free inode list, since the addition of the new
* extent will now cause it to have free inodes.
*
* a careful update approach is used to provide consistency
* (i.e. list consistency) in the face of updates to multiple
* buffers. under this approach, all required buffers are
* obtained before making any updates and are held until all
* updates are complete.
*
* PRE CONDITION: Already have buffer lock on iagp. Already have AG lock on
* this AG. Must have read lock on imap inode.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* iagp - pointer to iag.
* extno - extent number.
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*/
static int diNewExt(struct inomap * imap, struct iag * iagp, int extno)
{
int agno, iagno, fwd, back, freei = 0, sword, rc;
struct iag *aiagp = NULL, *biagp = NULL, *ciagp = NULL;
struct metapage *amp, *bmp, *cmp, *dmp;
struct inode *ipimap;
s64 blkno, hint;
int i, j;
u32 mask;
ino_t ino;
struct dinode *dp;
struct jfs_sb_info *sbi;
/* better have free extents.
*/
if (!iagp->nfreeexts) {
jfs_error(imap->im_ipimap->i_sb, "diNewExt: no free extents");
return -EIO;
}
/* get the inode map inode.
*/
ipimap = imap->im_ipimap;
sbi = JFS_SBI(ipimap->i_sb);
amp = bmp = cmp = NULL;
/* get the ag and iag numbers for this iag.
*/
agno = BLKTOAG(le64_to_cpu(iagp->agstart), sbi);
iagno = le32_to_cpu(iagp->iagnum);
/* check if this is the last free extent within the
* iag. if so, the iag must be removed from the ag
* free extent list, so get the iags preceeding and
* following the iag on this list.
*/
if (iagp->nfreeexts == cpu_to_le32(1)) {
if ((fwd = le32_to_cpu(iagp->extfreefwd)) >= 0) {
if ((rc = diIAGRead(imap, fwd, &amp)))
return (rc);
aiagp = (struct iag *) amp->data;
}
if ((back = le32_to_cpu(iagp->extfreeback)) >= 0) {
if ((rc = diIAGRead(imap, back, &bmp)))
goto error_out;
biagp = (struct iag *) bmp->data;
}
} else {
/* the iag has free extents. if all extents are free
* (as is the case for a newly allocated iag), the iag
* must be added to the ag free extent list, so get
* the iag at the head of the list in preparation for
* adding this iag to this list.
*/
fwd = back = -1;
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
if ((fwd = imap->im_agctl[agno].extfree) >= 0) {
if ((rc = diIAGRead(imap, fwd, &amp)))
goto error_out;
aiagp = (struct iag *) amp->data;
}
}
}
/* check if the iag has no free inodes. if so, the iag
* will have to be added to the ag free inode list, so get
* the iag at the head of the list in preparation for
* adding this iag to this list. in doing this, we must
* check if we already have the iag at the head of
* the list in hand.
*/
if (iagp->nfreeinos == 0) {
freei = imap->im_agctl[agno].inofree;
if (freei >= 0) {
if (freei == fwd) {
ciagp = aiagp;
} else if (freei == back) {
ciagp = biagp;
} else {
if ((rc = diIAGRead(imap, freei, &cmp)))
goto error_out;
ciagp = (struct iag *) cmp->data;
}
if (ciagp == NULL) {
jfs_error(imap->im_ipimap->i_sb,
"diNewExt: ciagp == NULL");
rc = -EIO;
goto error_out;
}
}
}
/* allocate disk space for the inode extent.
*/
if ((extno == 0) || (addressPXD(&iagp->inoext[extno - 1]) == 0))
hint = ((s64) agno << sbi->bmap->db_agl2size) - 1;
else
hint = addressPXD(&iagp->inoext[extno - 1]) +
lengthPXD(&iagp->inoext[extno - 1]) - 1;
if ((rc = dbAlloc(ipimap, hint, (s64) imap->im_nbperiext, &blkno)))
goto error_out;
/* compute the inode number of the first inode within the
* extent.
*/
ino = (iagno << L2INOSPERIAG) + (extno << L2INOSPEREXT);
/* initialize the inodes within the newly allocated extent a
* page at a time.
*/
for (i = 0; i < imap->im_nbperiext; i += sbi->nbperpage) {
/* get a buffer for this page of disk inodes.
*/
dmp = get_metapage(ipimap, blkno + i, PSIZE, 1);
if (dmp == NULL) {
rc = -EIO;
goto error_out;
}
dp = (struct dinode *) dmp->data;
/* initialize the inode number, mode, link count and
* inode extent address.
*/
for (j = 0; j < INOSPERPAGE; j++, dp++, ino++) {
dp->di_inostamp = cpu_to_le32(sbi->inostamp);
dp->di_number = cpu_to_le32(ino);
dp->di_fileset = cpu_to_le32(FILESYSTEM_I);
dp->di_mode = 0;
dp->di_nlink = 0;
PXDaddress(&(dp->di_ixpxd), blkno);
PXDlength(&(dp->di_ixpxd), imap->im_nbperiext);
}
write_metapage(dmp);
}
/* if this is the last free extent within the iag, remove the
* iag from the ag free extent list.
*/
if (iagp->nfreeexts == cpu_to_le32(1)) {
if (fwd >= 0)
aiagp->extfreeback = iagp->extfreeback;
if (back >= 0)
biagp->extfreefwd = iagp->extfreefwd;
else
imap->im_agctl[agno].extfree =
le32_to_cpu(iagp->extfreefwd);
iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
} else {
/* if the iag has all free extents (newly allocated iag),
* add the iag to the ag free extent list.
*/
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
if (fwd >= 0)
aiagp->extfreeback = cpu_to_le32(iagno);
iagp->extfreefwd = cpu_to_le32(fwd);
iagp->extfreeback = cpu_to_le32(-1);
imap->im_agctl[agno].extfree = iagno;
}
}
/* if the iag has no free inodes, add the iag to the
* ag free inode list.
*/
if (iagp->nfreeinos == 0) {
if (freei >= 0)
ciagp->inofreeback = cpu_to_le32(iagno);
iagp->inofreefwd =
cpu_to_le32(imap->im_agctl[agno].inofree);
iagp->inofreeback = cpu_to_le32(-1);
imap->im_agctl[agno].inofree = iagno;
}
/* initialize the extent descriptor of the extent. */
PXDlength(&iagp->inoext[extno], imap->im_nbperiext);
PXDaddress(&iagp->inoext[extno], blkno);
/* initialize the working and persistent map of the extent.
* the working map will be initialized such that
* it indicates the first inode of the extent is allocated.
*/
iagp->wmap[extno] = cpu_to_le32(HIGHORDER);
iagp->pmap[extno] = 0;
/* update the free inode and free extent summary maps
* for the extent to indicate the extent has free inodes
* and no longer represents a free extent.
*/
sword = extno >> L2EXTSPERSUM;
mask = HIGHORDER >> (extno & (EXTSPERSUM - 1));
iagp->extsmap[sword] |= cpu_to_le32(mask);
iagp->inosmap[sword] &= cpu_to_le32(~mask);
/* update the free inode and free extent counts for the
* iag.
*/
iagp->nfreeinos = cpu_to_le32(le32_to_cpu(iagp->nfreeinos) +
(INOSPEREXT - 1));
iagp->nfreeexts = cpu_to_le32(le32_to_cpu(iagp->nfreeexts) - 1);
/* update the free and backed inode counts for the ag.
*/
imap->im_agctl[agno].numfree += (INOSPEREXT - 1);
imap->im_agctl[agno].numinos += INOSPEREXT;
/* update the free and backed inode counts for the inode map.
*/
atomic_add(INOSPEREXT - 1, &imap->im_numfree);
atomic_add(INOSPEREXT, &imap->im_numinos);
/* write the iags.
*/
if (amp)
write_metapage(amp);
if (bmp)
write_metapage(bmp);
if (cmp)
write_metapage(cmp);
return (0);
error_out:
/* release the iags.
*/
if (amp)
release_metapage(amp);
if (bmp)
release_metapage(bmp);
if (cmp)
release_metapage(cmp);
return (rc);
}
/*
* NAME: diNewIAG(imap,iagnop,agno)
*
* FUNCTION: allocate a new iag for an allocation group.
*
* first tries to allocate the iag from the inode map
* iagfree list:
* if the list has free iags, the head of the list is removed
* and returned to satisfy the request.
* if the inode map's iag free list is empty, the inode map
* is extended to hold a new iag. this new iag is initialized
* and returned to satisfy the request.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* iagnop - pointer to an iag number set with the number of the
* newly allocated iag upon successful return.
* agno - allocation group number.
* bpp - Buffer pointer to be filled in with new IAG's buffer
*
* RETURN VALUES:
* 0 - success.
* -ENOSPC - insufficient disk resources.
* -EIO - i/o error.
*
* serialization:
* AG lock held on entry/exit;
* write lock on the map is held inside;
* read lock on the map is held on successful completion;
*
* note: new iag transaction:
* . synchronously write iag;
* . write log of xtree and inode of imap;
* . commit;
* . synchronous write of xtree (right to left, bottom to top);
* . at start of logredo(): init in-memory imap with one additional iag page;
* . at end of logredo(): re-read imap inode to determine
* new imap size;
*/
static int
diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp)
{
int rc;
int iagno, i, xlen;
struct inode *ipimap;
struct super_block *sb;
struct jfs_sb_info *sbi;
struct metapage *mp;
struct iag *iagp;
s64 xaddr = 0;
s64 blkno;
tid_t tid;
#ifdef _STILL_TO_PORT
xad_t xad;
#endif /* _STILL_TO_PORT */
struct inode *iplist[1];
/* pick up pointers to the inode map and mount inodes */
ipimap = imap->im_ipimap;
sb = ipimap->i_sb;
sbi = JFS_SBI(sb);
/* acquire the free iag lock */
IAGFREE_LOCK(imap);
/* if there are any iags on the inode map free iag list,
* allocate the iag from the head of the list.
*/
if (imap->im_freeiag >= 0) {
/* pick up the iag number at the head of the list */
iagno = imap->im_freeiag;
/* determine the logical block number of the iag */
blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
} else {
/* no free iags. the inode map will have to be extented
* to include a new iag.
*/
/* acquire inode map lock */
IWRITE_LOCK(ipimap);
if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) {
IWRITE_UNLOCK(ipimap);
IAGFREE_UNLOCK(imap);
jfs_error(imap->im_ipimap->i_sb,
"diNewIAG: ipimap->i_size is wrong");
return -EIO;
}
/* get the next avaliable iag number */
iagno = imap->im_nextiag;
/* make sure that we have not exceeded the maximum inode
* number limit.
*/
if (iagno > (MAXIAGS - 1)) {
/* release the inode map lock */
IWRITE_UNLOCK(ipimap);
rc = -ENOSPC;
goto out;
}
/*
* synchronously append new iag page.
*/
/* determine the logical address of iag page to append */
blkno = IAGTOLBLK(iagno, sbi->l2nbperpage);
/* Allocate extent for new iag page */
xlen = sbi->nbperpage;
if ((rc = dbAlloc(ipimap, 0, (s64) xlen, &xaddr))) {
/* release the inode map lock */
IWRITE_UNLOCK(ipimap);
goto out;
}
/*
* start transaction of update of the inode map
* addressing structure pointing to the new iag page;
*/
tid = txBegin(sb, COMMIT_FORCE);
down(&JFS_IP(ipimap)->commit_sem);
/* update the inode map addressing structure to point to it */
if ((rc =
xtInsert(tid, ipimap, 0, blkno, xlen, &xaddr, 0))) {
txEnd(tid);
up(&JFS_IP(ipimap)->commit_sem);
/* Free the blocks allocated for the iag since it was
* not successfully added to the inode map
*/
dbFree(ipimap, xaddr, (s64) xlen);
/* release the inode map lock */
IWRITE_UNLOCK(ipimap);
goto out;
}
/* update the inode map's inode to reflect the extension */
ipimap->i_size += PSIZE;
inode_add_bytes(ipimap, PSIZE);
/* assign a buffer for the page */
mp = get_metapage(ipimap, blkno, PSIZE, 0);
if (!mp) {
/*
* This is very unlikely since we just created the
* extent, but let's try to handle it correctly
*/
xtTruncate(tid, ipimap, ipimap->i_size - PSIZE,
COMMIT_PWMAP);
txAbort(tid, 0);
txEnd(tid);
/* release the inode map lock */
IWRITE_UNLOCK(ipimap);
rc = -EIO;
goto out;
}
iagp = (struct iag *) mp->data;
/* init the iag */
memset(iagp, 0, sizeof(struct iag));
iagp->iagnum = cpu_to_le32(iagno);
iagp->inofreefwd = iagp->inofreeback = cpu_to_le32(-1);
iagp->extfreefwd = iagp->extfreeback = cpu_to_le32(-1);
iagp->iagfree = cpu_to_le32(-1);
iagp->nfreeinos = 0;
iagp->nfreeexts = cpu_to_le32(EXTSPERIAG);
/* initialize the free inode summary map (free extent
* summary map initialization handled by bzero).
*/
for (i = 0; i < SMAPSZ; i++)
iagp->inosmap[i] = cpu_to_le32(ONES);
/*
* Write and sync the metapage
*/
flush_metapage(mp);
/*
* txCommit(COMMIT_FORCE) will synchronously write address
* index pages and inode after commit in careful update order
* of address index pages (right to left, bottom up);
*/
iplist[0] = ipimap;
rc = txCommit(tid, 1, &iplist[0], COMMIT_FORCE);
txEnd(tid);
up(&JFS_IP(ipimap)->commit_sem);
duplicateIXtree(sb, blkno, xlen, &xaddr);
/* update the next avaliable iag number */
imap->im_nextiag += 1;
/* Add the iag to the iag free list so we don't lose the iag
* if a failure happens now.
*/
imap->im_freeiag = iagno;
/* Until we have logredo working, we want the imap inode &
* control page to be up to date.
*/
diSync(ipimap);
/* release the inode map lock */
IWRITE_UNLOCK(ipimap);
}
/* obtain read lock on map */
IREAD_LOCK(ipimap);
/* read the iag */
if ((rc = diIAGRead(imap, iagno, &mp))) {
IREAD_UNLOCK(ipimap);
rc = -EIO;
goto out;
}
iagp = (struct iag *) mp->data;
/* remove the iag from the iag free list */
imap->im_freeiag = le32_to_cpu(iagp->iagfree);
iagp->iagfree = cpu_to_le32(-1);
/* set the return iag number and buffer pointer */
*iagnop = iagno;
*mpp = mp;
out:
/* release the iag free lock */
IAGFREE_UNLOCK(imap);
return (rc);
}
/*
* NAME: diIAGRead()
*
* FUNCTION: get the buffer for the specified iag within a fileset
* or aggregate inode map.
*
* PARAMETERS:
* imap - pointer to inode map control structure.
* iagno - iag number.
* bpp - point to buffer pointer to be filled in on successful
* exit.
*
* SERIALIZATION:
* must have read lock on imap inode
* (When called by diExtendFS, the filesystem is quiesced, therefore
* the read lock is unnecessary.)
*
* RETURN VALUES:
* 0 - success.
* -EIO - i/o error.
*/
static int diIAGRead(struct inomap * imap, int iagno, struct metapage ** mpp)
{
struct inode *ipimap = imap->im_ipimap;
s64 blkno;
/* compute the logical block number of the iag. */
blkno = IAGTOLBLK(iagno, JFS_SBI(ipimap->i_sb)->l2nbperpage);
/* read the iag. */
*mpp = read_metapage(ipimap, blkno, PSIZE, 0);
if (*mpp == NULL) {
return -EIO;
}
return (0);
}
/*
* NAME: diFindFree()
*
* FUNCTION: find the first free bit in a word starting at
* the specified bit position.
*
* PARAMETERS:
* word - word to be examined.
* start - starting bit position.
*
* RETURN VALUES:
* bit position of first free bit in the word or 32 if
* no free bits were found.
*/
static int diFindFree(u32 word, int start)
{
int bitno;
assert(start < 32);
/* scan the word for the first free bit. */
for (word <<= start, bitno = start; bitno < 32;
bitno++, word <<= 1) {
if ((word & HIGHORDER) == 0)
break;
}
return (bitno);
}
/*
* NAME: diUpdatePMap()
*
* FUNCTION: Update the persistent map in an IAG for the allocation or
* freeing of the specified inode.
*
* PRE CONDITIONS: Working map has already been updated for allocate.
*
* PARAMETERS:
* ipimap - Incore inode map inode
* inum - Number of inode to mark in permanent map
* is_free - If TRUE indicates inode should be marked freed, otherwise
* indicates inode should be marked allocated.
*
* RETURN VALUES:
* 0 for success
*/
int
diUpdatePMap(struct inode *ipimap,
unsigned long inum, boolean_t is_free, struct tblock * tblk)
{
int rc;
struct iag *iagp;
struct metapage *mp;
int iagno, ino, extno, bitno;
struct inomap *imap;
u32 mask;
struct jfs_log *log;
int lsn, difft, diffp;
unsigned long flags;
imap = JFS_IP(ipimap)->i_imap;
/* get the iag number containing the inode */
iagno = INOTOIAG(inum);
/* make sure that the iag is contained within the map */
if (iagno >= imap->im_nextiag) {
jfs_error(ipimap->i_sb,
"diUpdatePMap: the iag is outside the map");
return -EIO;
}
/* read the iag */
IREAD_LOCK(ipimap);
rc = diIAGRead(imap, iagno, &mp);
IREAD_UNLOCK(ipimap);
if (rc)
return (rc);
metapage_wait_for_io(mp);
iagp = (struct iag *) mp->data;
/* get the inode number and extent number of the inode within
* the iag and the inode number within the extent.
*/
ino = inum & (INOSPERIAG - 1);
extno = ino >> L2INOSPEREXT;
bitno = ino & (INOSPEREXT - 1);
mask = HIGHORDER >> bitno;
/*
* mark the inode free in persistent map:
*/
if (is_free == TRUE) {
/* The inode should have been allocated both in working
* map and in persistent map;
* the inode will be freed from working map at the release
* of last reference release;
*/
if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
jfs_error(ipimap->i_sb,
"diUpdatePMap: inode %ld not marked as "
"allocated in wmap!", inum);
}
if (!(le32_to_cpu(iagp->pmap[extno]) & mask)) {
jfs_error(ipimap->i_sb,
"diUpdatePMap: inode %ld not marked as "
"allocated in pmap!", inum);
}
/* update the bitmap for the extent of the freed inode */
iagp->pmap[extno] &= cpu_to_le32(~mask);
}
/*
* mark the inode allocated in persistent map:
*/
else {
/* The inode should be already allocated in the working map
* and should be free in persistent map;
*/
if (!(le32_to_cpu(iagp->wmap[extno]) & mask)) {
release_metapage(mp);
jfs_error(ipimap->i_sb,
"diUpdatePMap: the inode is not allocated in "
"the working map");
return -EIO;
}
if ((le32_to_cpu(iagp->pmap[extno]) & mask) != 0) {
release_metapage(mp);
jfs_error(ipimap->i_sb,
"diUpdatePMap: the inode is not free in the "
"persistent map");
return -EIO;
}
/* update the bitmap for the extent of the allocated inode */
iagp->pmap[extno] |= cpu_to_le32(mask);
}
/*
* update iag lsn
*/
lsn = tblk->lsn;
log = JFS_SBI(tblk->sb)->log;
if (mp->lsn != 0) {
/* inherit older/smaller lsn */
logdiff(difft, lsn, log);
logdiff(diffp, mp->lsn, log);
LOGSYNC_LOCK(log, flags);
if (difft < diffp) {
mp->lsn = lsn;
/* move mp after tblock in logsync list */
list_move(&mp->synclist, &tblk->synclist);
}
/* inherit younger/larger clsn */
assert(mp->clsn);
logdiff(difft, tblk->clsn, log);
logdiff(diffp, mp->clsn, log);
if (difft > diffp)
mp->clsn = tblk->clsn;
LOGSYNC_UNLOCK(log, flags);
} else {
mp->log = log;
mp->lsn = lsn;
/* insert mp after tblock in logsync list */
LOGSYNC_LOCK(log, flags);
log->count++;
list_add(&mp->synclist, &tblk->synclist);
mp->clsn = tblk->clsn;
LOGSYNC_UNLOCK(log, flags);
}
write_metapage(mp);
return (0);
}
/*
* diExtendFS()
*
* function: update imap for extendfs();
*
* note: AG size has been increased s.t. each k old contiguous AGs are
* coalesced into a new AG;
*/
int diExtendFS(struct inode *ipimap, struct inode *ipbmap)
{
int rc, rcx = 0;
struct inomap *imap = JFS_IP(ipimap)->i_imap;
struct iag *iagp = NULL, *hiagp = NULL;
struct bmap *mp = JFS_SBI(ipbmap->i_sb)->bmap;
struct metapage *bp, *hbp;
int i, n, head;
int numinos, xnuminos = 0, xnumfree = 0;
s64 agstart;
jfs_info("diExtendFS: nextiag:%d numinos:%d numfree:%d",
imap->im_nextiag, atomic_read(&imap->im_numinos),
atomic_read(&imap->im_numfree));
/*
* reconstruct imap
*
* coalesce contiguous k (newAGSize/oldAGSize) AGs;
* i.e., (AGi, ..., AGj) where i = k*n and j = k*(n+1) - 1 to AGn;
* note: new AG size = old AG size * (2**x).
*/
/* init per AG control information im_agctl[] */
for (i = 0; i < MAXAG; i++) {
imap->im_agctl[i].inofree = -1;
imap->im_agctl[i].extfree = -1;
imap->im_agctl[i].numinos = 0; /* number of backed inodes */
imap->im_agctl[i].numfree = 0; /* number of free backed inodes */
}
/*
* process each iag page of the map.
*
* rebuild AG Free Inode List, AG Free Inode Extent List;
*/
for (i = 0; i < imap->im_nextiag; i++) {
if ((rc = diIAGRead(imap, i, &bp))) {
rcx = rc;
continue;
}
iagp = (struct iag *) bp->data;
if (le32_to_cpu(iagp->iagnum) != i) {
release_metapage(bp);
jfs_error(ipimap->i_sb,
"diExtendFs: unexpected value of iagnum");
return -EIO;
}
/* leave free iag in the free iag list */
if (iagp->nfreeexts == cpu_to_le32(EXTSPERIAG)) {
release_metapage(bp);
continue;
}
/* agstart that computes to the same ag is treated as same; */
agstart = le64_to_cpu(iagp->agstart);
/* iagp->agstart = agstart & ~(mp->db_agsize - 1); */
n = agstart >> mp->db_agl2size;
/* compute backed inodes */
numinos = (EXTSPERIAG - le32_to_cpu(iagp->nfreeexts))
<< L2INOSPEREXT;
if (numinos > 0) {
/* merge AG backed inodes */
imap->im_agctl[n].numinos += numinos;
xnuminos += numinos;
}
/* if any backed free inodes, insert at AG free inode list */
if ((int) le32_to_cpu(iagp->nfreeinos) > 0) {
if ((head = imap->im_agctl[n].inofree) == -1) {
iagp->inofreefwd = cpu_to_le32(-1);
iagp->inofreeback = cpu_to_le32(-1);
} else {
if ((rc = diIAGRead(imap, head, &hbp))) {
rcx = rc;
goto nextiag;
}
hiagp = (struct iag *) hbp->data;
hiagp->inofreeback = iagp->iagnum;
iagp->inofreefwd = cpu_to_le32(head);
iagp->inofreeback = cpu_to_le32(-1);
write_metapage(hbp);
}
imap->im_agctl[n].inofree =
le32_to_cpu(iagp->iagnum);
/* merge AG backed free inodes */
imap->im_agctl[n].numfree +=
le32_to_cpu(iagp->nfreeinos);
xnumfree += le32_to_cpu(iagp->nfreeinos);
}
/* if any free extents, insert at AG free extent list */
if (le32_to_cpu(iagp->nfreeexts) > 0) {
if ((head = imap->im_agctl[n].extfree) == -1) {
iagp->extfreefwd = cpu_to_le32(-1);
iagp->extfreeback = cpu_to_le32(-1);
} else {
if ((rc = diIAGRead(imap, head, &hbp))) {
rcx = rc;
goto nextiag;
}
hiagp = (struct iag *) hbp->data;
hiagp->extfreeback = iagp->iagnum;
iagp->extfreefwd = cpu_to_le32(head);
iagp->extfreeback = cpu_to_le32(-1);
write_metapage(hbp);
}
imap->im_agctl[n].extfree =
le32_to_cpu(iagp->iagnum);
}
nextiag:
write_metapage(bp);
}
if (xnuminos != atomic_read(&imap->im_numinos) ||
xnumfree != atomic_read(&imap->im_numfree)) {
jfs_error(ipimap->i_sb,
"diExtendFs: numinos or numfree incorrect");
return -EIO;
}
return rcx;
}
/*
* duplicateIXtree()
*
* serialization: IWRITE_LOCK held on entry/exit
*
* note: shadow page with regular inode (rel.2);
*/
static void duplicateIXtree(struct super_block *sb, s64 blkno,
int xlen, s64 *xaddr)
{
struct jfs_superblock *j_sb;
struct buffer_head *bh;
struct inode *ip;
tid_t tid;
/* if AIT2 ipmap2 is bad, do not try to update it */
if (JFS_SBI(sb)->mntflag & JFS_BAD_SAIT) /* s_flag */
return;
ip = diReadSpecial(sb, FILESYSTEM_I, 1);
if (ip == NULL) {
JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
if (readSuper(sb, &bh))
return;
j_sb = (struct jfs_superblock *)bh->b_data;
j_sb->s_flag |= cpu_to_le32(JFS_BAD_SAIT);
mark_buffer_dirty(bh);
sync_dirty_buffer(bh);
brelse(bh);
return;
}
/* start transaction */
tid = txBegin(sb, COMMIT_FORCE);
/* update the inode map addressing structure to point to it */
if (xtInsert(tid, ip, 0, blkno, xlen, xaddr, 0)) {
JFS_SBI(sb)->mntflag |= JFS_BAD_SAIT;
txAbort(tid, 1);
goto cleanup;
}
/* update the inode map's inode to reflect the extension */
ip->i_size += PSIZE;
inode_add_bytes(ip, PSIZE);
txCommit(tid, 1, &ip, COMMIT_FORCE);
cleanup:
txEnd(tid);
diFreeSpecial(ip);
}
/*
* NAME: copy_from_dinode()
*
* FUNCTION: Copies inode info from disk inode to in-memory inode
*
* RETURN VALUES:
* 0 - success
* -ENOMEM - insufficient memory
*/
static int copy_from_dinode(struct dinode * dip, struct inode *ip)
{
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
jfs_ip->fileset = le32_to_cpu(dip->di_fileset);
jfs_ip->mode2 = le32_to_cpu(dip->di_mode);
ip->i_mode = le32_to_cpu(dip->di_mode) & 0xffff;
ip->i_nlink = le32_to_cpu(dip->di_nlink);
ip->i_uid = le32_to_cpu(dip->di_uid);
ip->i_gid = le32_to_cpu(dip->di_gid);
ip->i_size = le64_to_cpu(dip->di_size);
ip->i_atime.tv_sec = le32_to_cpu(dip->di_atime.tv_sec);
ip->i_atime.tv_nsec = le32_to_cpu(dip->di_atime.tv_nsec);
ip->i_mtime.tv_sec = le32_to_cpu(dip->di_mtime.tv_sec);
ip->i_mtime.tv_nsec = le32_to_cpu(dip->di_mtime.tv_nsec);
ip->i_ctime.tv_sec = le32_to_cpu(dip->di_ctime.tv_sec);
ip->i_ctime.tv_nsec = le32_to_cpu(dip->di_ctime.tv_nsec);
ip->i_blksize = ip->i_sb->s_blocksize;
ip->i_blocks = LBLK2PBLK(ip->i_sb, le64_to_cpu(dip->di_nblocks));
ip->i_generation = le32_to_cpu(dip->di_gen);
jfs_ip->ixpxd = dip->di_ixpxd; /* in-memory pxd's are little-endian */
jfs_ip->acl = dip->di_acl; /* as are dxd's */
jfs_ip->ea = dip->di_ea;
jfs_ip->next_index = le32_to_cpu(dip->di_next_index);
jfs_ip->otime = le32_to_cpu(dip->di_otime.tv_sec);
jfs_ip->acltype = le32_to_cpu(dip->di_acltype);
if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode)) {
jfs_ip->dev = le32_to_cpu(dip->di_rdev);
ip->i_rdev = new_decode_dev(jfs_ip->dev);
}
if (S_ISDIR(ip->i_mode)) {
memcpy(&jfs_ip->i_dirtable, &dip->di_dirtable, 384);
} else if (S_ISREG(ip->i_mode) || S_ISLNK(ip->i_mode)) {
memcpy(&jfs_ip->i_xtroot, &dip->di_xtroot, 288);
} else
memcpy(&jfs_ip->i_inline_ea, &dip->di_inlineea, 128);
/* Zero the in-memory-only stuff */
jfs_ip->cflag = 0;
jfs_ip->btindex = 0;
jfs_ip->btorder = 0;
jfs_ip->bxflag = 0;
jfs_ip->blid = 0;
jfs_ip->atlhead = 0;
jfs_ip->atltail = 0;
jfs_ip->xtlid = 0;
return (0);
}
/*
* NAME: copy_to_dinode()
*
* FUNCTION: Copies inode info from in-memory inode to disk inode
*/
static void copy_to_dinode(struct dinode * dip, struct inode *ip)
{
struct jfs_inode_info *jfs_ip = JFS_IP(ip);
dip->di_fileset = cpu_to_le32(jfs_ip->fileset);
dip->di_inostamp = cpu_to_le32(JFS_SBI(ip->i_sb)->inostamp);
dip->di_number = cpu_to_le32(ip->i_ino);
dip->di_gen = cpu_to_le32(ip->i_generation);
dip->di_size = cpu_to_le64(ip->i_size);
dip->di_nblocks = cpu_to_le64(PBLK2LBLK(ip->i_sb, ip->i_blocks));
dip->di_nlink = cpu_to_le32(ip->i_nlink);
dip->di_uid = cpu_to_le32(ip->i_uid);
dip->di_gid = cpu_to_le32(ip->i_gid);
/*
* mode2 is only needed for storing the higher order bits.
* Trust i_mode for the lower order ones
*/
dip->di_mode = cpu_to_le32((jfs_ip->mode2 & 0xffff0000) | ip->i_mode);
dip->di_atime.tv_sec = cpu_to_le32(ip->i_atime.tv_sec);
dip->di_atime.tv_nsec = cpu_to_le32(ip->i_atime.tv_nsec);
dip->di_ctime.tv_sec = cpu_to_le32(ip->i_ctime.tv_sec);
dip->di_ctime.tv_nsec = cpu_to_le32(ip->i_ctime.tv_nsec);
dip->di_mtime.tv_sec = cpu_to_le32(ip->i_mtime.tv_sec);
dip->di_mtime.tv_nsec = cpu_to_le32(ip->i_mtime.tv_nsec);
dip->di_ixpxd = jfs_ip->ixpxd; /* in-memory pxd's are little-endian */
dip->di_acl = jfs_ip->acl; /* as are dxd's */
dip->di_ea = jfs_ip->ea;
dip->di_next_index = cpu_to_le32(jfs_ip->next_index);
dip->di_otime.tv_sec = cpu_to_le32(jfs_ip->otime);
dip->di_otime.tv_nsec = 0;
dip->di_acltype = cpu_to_le32(jfs_ip->acltype);
if (S_ISCHR(ip->i_mode) || S_ISBLK(ip->i_mode))
dip->di_rdev = cpu_to_le32(jfs_ip->dev);
}
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