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-rw-r--r--fs/jfs/jfs_imap.c3270
1 files changed, 3270 insertions, 0 deletions
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
new file mode 100644
index 000000000000..783831301625
--- /dev/null
+++ b/fs/jfs/jfs_imap.c
@@ -0,0 +1,3270 @@
+/*
+ * 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_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"
+
+/*
+ * 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])
+
+/*
+ * external references
+ */
+extern struct address_space_operations jfs_aops;
+
+/*
+ * 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 *);
+
+/*
+ * debug code for double-checking inode map
+ */
+/* #define _JFS_DEBUG_IMAP 1 */
+
+#ifdef _JFS_DEBUG_IMAP
+#define DBG_DIINIT(imap) DBGdiInit(imap)
+#define DBG_DIALLOC(imap, ino) DBGdiAlloc(imap, ino)
+#define DBG_DIFREE(imap, ino) DBGdiFree(imap, ino)
+
+static void *DBGdiInit(struct inomap * imap);
+static void DBGdiAlloc(struct inomap * imap, ino_t ino);
+static void DBGdiFree(struct inomap * imap, ino_t ino);
+#else
+#define DBG_DIINIT(imap)
+#define DBG_DIALLOC(imap, ino)
+#define DBG_DIFREE(imap, ino)
+#endif /* _JFS_DEBUG_IMAP */
+
+/*
+ * 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;
+
+// DBG_DIINIT(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_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);
+
+ 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;
+
+ ip->i_state &= ~I_DIRTY;
+
+ 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);
+ DBG_DIFREE(imap, inum);
+
+ /* 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;
+ DBG_DIFREE(imap, inum);
+ 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;
+ DBG_DIALLOC(JFS_IP(ipimap)->i_imap, ip->i_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;
+ }
+
+ /* assign a buffer for the page */
+ mp = get_metapage(ipimap, xaddr, PSIZE, 1);
+ if (!mp) {
+ /* 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);
+
+ 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);
+
+ /*
+ * Invalidate the page after writing and syncing it.
+ * After it's initialized, we access it in a different
+ * address space
+ */
+ set_bit(META_discard, &mp->flag);
+ flush_metapage(mp);
+
+ /*
+ * start tyransaction 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);
+
+ /*
+ * 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;
+
+ 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);
+ 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);
+ if (difft < diffp) {
+ mp->lsn = lsn;
+ /* move mp after tblock in logsync list */
+ LOGSYNC_LOCK(log);
+ list_move(&mp->synclist, &tblk->synclist);
+ LOGSYNC_UNLOCK(log);
+ }
+ /* inherit younger/larger clsn */
+ LOGSYNC_LOCK(log);
+ assert(mp->clsn);
+ logdiff(difft, tblk->clsn, log);
+ logdiff(diffp, mp->clsn, log);
+ if (difft > diffp)
+ mp->clsn = tblk->clsn;
+ LOGSYNC_UNLOCK(log);
+ } else {
+ mp->log = log;
+ mp->lsn = lsn;
+ /* insert mp after tblock in logsync list */
+ LOGSYNC_LOCK(log);
+ log->count++;
+ list_add(&mp->synclist, &tblk->synclist);
+ mp->clsn = tblk->clsn;
+ LOGSYNC_UNLOCK(log);
+ }
+ 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);
+}
+
+#ifdef _JFS_DEBUG_IMAP
+/*
+ * DBGdiInit()
+ */
+static void *DBGdiInit(struct inomap * imap)
+{
+ u32 *dimap;
+ int size;
+ size = 64 * 1024;
+ if ((dimap = (u32 *) xmalloc(size, L2PSIZE, kernel_heap)) == NULL)
+ assert(0);
+ bzero((void *) dimap, size);
+ imap->im_DBGdimap = dimap;
+}
+
+/*
+ * DBGdiAlloc()
+ */
+static void DBGdiAlloc(struct inomap * imap, ino_t ino)
+{
+ u32 *dimap = imap->im_DBGdimap;
+ int w, b;
+ u32 m;
+ w = ino >> 5;
+ b = ino & 31;
+ m = 0x80000000 >> b;
+ assert(w < 64 * 256);
+ if (dimap[w] & m) {
+ printk("DEBUG diAlloc: duplicate alloc ino:0x%x\n", ino);
+ }
+ dimap[w] |= m;
+}
+
+/*
+ * DBGdiFree()
+ */
+static void DBGdiFree(struct inomap * imap, ino_t ino)
+{
+ u32 *dimap = imap->im_DBGdimap;
+ int w, b;
+ u32 m;
+ w = ino >> 5;
+ b = ino & 31;
+ m = 0x80000000 >> b;
+ assert(w < 64 * 256);
+ if ((dimap[w] & m) == 0) {
+ printk("DEBUG diFree: duplicate free ino:0x%x\n", ino);
+ }
+ dimap[w] &= ~m;
+}
+
+static void dump_cp(struct inomap * ipimap, char *function, int line)
+{
+ printk("\n* ********* *\nControl Page %s %d\n", function, line);
+ printk("FreeIAG %d\tNextIAG %d\n", ipimap->im_freeiag,
+ ipimap->im_nextiag);
+ printk("NumInos %d\tNumFree %d\n",
+ atomic_read(&ipimap->im_numinos),
+ atomic_read(&ipimap->im_numfree));
+ printk("AG InoFree %d\tAG ExtFree %d\n",
+ ipimap->im_agctl[0].inofree, ipimap->im_agctl[0].extfree);
+ printk("AG NumInos %d\tAG NumFree %d\n",
+ ipimap->im_agctl[0].numinos, ipimap->im_agctl[0].numfree);
+}
+
+static void dump_iag(struct iag * iag, char *function, int line)
+{
+ printk("\n* ********* *\nIAG %s %d\n", function, line);
+ printk("IagNum %d\tIAG Free %d\n", le32_to_cpu(iag->iagnum),
+ le32_to_cpu(iag->iagfree));
+ printk("InoFreeFwd %d\tInoFreeBack %d\n",
+ le32_to_cpu(iag->inofreefwd),
+ le32_to_cpu(iag->inofreeback));
+ printk("ExtFreeFwd %d\tExtFreeBack %d\n",
+ le32_to_cpu(iag->extfreefwd),
+ le32_to_cpu(iag->extfreeback));
+ printk("NFreeInos %d\tNFreeExts %d\n", le32_to_cpu(iag->nfreeinos),
+ le32_to_cpu(iag->nfreeexts));
+}
+#endif /* _JFS_DEBUG_IMAP */