patch-2.4.25 linux-2.4.25/fs/xfs/xfs_ialloc.c
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- Lines: 1403
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_ialloc.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_ialloc.c linux-2.4.25/fs/xfs/xfs_ialloc.c
@@ -0,0 +1,1402 @@
+/*
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_alloc.h"
+#include "xfs_bit.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_bmap.h"
+
+/*
+ * Log specified fields for the inode given by bp and off.
+ */
+STATIC void
+xfs_ialloc_log_di(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_buf_t *bp, /* inode buffer */
+ int off, /* index of inode in buffer */
+ int fields) /* bitmask of fields to log */
+{
+ int first; /* first byte number */
+ int ioffset; /* off in bytes */
+ int last; /* last byte number */
+ xfs_mount_t *mp; /* mount point structure */
+ static const short offsets[] = { /* field offsets */
+ /* keep in sync with bits */
+ offsetof(xfs_dinode_core_t, di_magic),
+ offsetof(xfs_dinode_core_t, di_mode),
+ offsetof(xfs_dinode_core_t, di_version),
+ offsetof(xfs_dinode_core_t, di_format),
+ offsetof(xfs_dinode_core_t, di_onlink),
+ offsetof(xfs_dinode_core_t, di_uid),
+ offsetof(xfs_dinode_core_t, di_gid),
+ offsetof(xfs_dinode_core_t, di_nlink),
+ offsetof(xfs_dinode_core_t, di_projid),
+ offsetof(xfs_dinode_core_t, di_pad),
+ offsetof(xfs_dinode_core_t, di_atime),
+ offsetof(xfs_dinode_core_t, di_mtime),
+ offsetof(xfs_dinode_core_t, di_ctime),
+ offsetof(xfs_dinode_core_t, di_size),
+ offsetof(xfs_dinode_core_t, di_nblocks),
+ offsetof(xfs_dinode_core_t, di_extsize),
+ offsetof(xfs_dinode_core_t, di_nextents),
+ offsetof(xfs_dinode_core_t, di_anextents),
+ offsetof(xfs_dinode_core_t, di_forkoff),
+ offsetof(xfs_dinode_core_t, di_aformat),
+ offsetof(xfs_dinode_core_t, di_dmevmask),
+ offsetof(xfs_dinode_core_t, di_dmstate),
+ offsetof(xfs_dinode_core_t, di_flags),
+ offsetof(xfs_dinode_core_t, di_gen),
+ offsetof(xfs_dinode_t, di_next_unlinked),
+ offsetof(xfs_dinode_t, di_u),
+ offsetof(xfs_dinode_t, di_a),
+ sizeof(xfs_dinode_t)
+ };
+
+
+ ASSERT(offsetof(xfs_dinode_t, di_core) == 0);
+ ASSERT((fields & (XFS_DI_U|XFS_DI_A)) == 0);
+ mp = tp->t_mountp;
+ /*
+ * Get the inode-relative first and last bytes for these fields
+ */
+ xfs_btree_offsets(fields, offsets, XFS_DI_NUM_BITS, &first, &last);
+ /*
+ * Convert to buffer offsets and log it.
+ */
+ ioffset = off << mp->m_sb.sb_inodelog;
+ first += ioffset;
+ last += ioffset;
+ xfs_trans_log_buf(tp, bp, first, last);
+}
+
+/*
+ * Allocation group level functions.
+ */
+
+/*
+ * Allocate new inodes in the allocation group specified by agbp.
+ * Return 0 for success, else error code.
+ */
+STATIC int /* error code or 0 */
+xfs_ialloc_ag_alloc(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_buf_t *agbp, /* alloc group buffer */
+ int *alloc)
+{
+ xfs_agi_t *agi; /* allocation group header */
+ xfs_alloc_arg_t args; /* allocation argument structure */
+ int blks_per_cluster; /* fs blocks per inode cluster */
+ xfs_btree_cur_t *cur; /* inode btree cursor */
+ xfs_daddr_t d; /* disk addr of buffer */
+ int error;
+ xfs_buf_t *fbuf; /* new free inodes' buffer */
+ xfs_dinode_t *free; /* new free inode structure */
+ int i; /* inode counter */
+ int j; /* block counter */
+ int nbufs; /* num bufs of new inodes */
+ xfs_agino_t newino; /* new first inode's number */
+ xfs_agino_t newlen; /* new number of inodes */
+ int ninodes; /* num inodes per buf */
+ xfs_agino_t thisino; /* current inode number, for loop */
+ int version; /* inode version number to use */
+ int isaligned; /* inode allocation at stripe unit */
+ /* boundary */
+ xfs_dinode_core_t dic; /* a dinode_core to copy to new */
+ /* inodes */
+
+ args.tp = tp;
+ args.mp = tp->t_mountp;
+
+ /*
+ * Locking will ensure that we don't have two callers in here
+ * at one time.
+ */
+ newlen = XFS_IALLOC_INODES(args.mp);
+ if (args.mp->m_maxicount &&
+ args.mp->m_sb.sb_icount + newlen > args.mp->m_maxicount)
+ return XFS_ERROR(ENOSPC);
+ args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp);
+ /*
+ * Set the alignment for the allocation.
+ * If stripe alignment is turned on then align at stripe unit
+ * boundary.
+ * If the cluster size is smaller than a filesystem block
+ * then we're doing I/O for inodes in filesystem block size pieces,
+ * so don't need alignment anyway.
+ */
+ isaligned = 0;
+ if (args.mp->m_sinoalign) {
+ ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
+ args.alignment = args.mp->m_dalign;
+ isaligned = 1;
+ } else if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
+ args.mp->m_sb.sb_inoalignmt >=
+ XFS_B_TO_FSBT(args.mp, XFS_INODE_CLUSTER_SIZE(args.mp)))
+ args.alignment = args.mp->m_sb.sb_inoalignmt;
+ else
+ args.alignment = 1;
+ agi = XFS_BUF_TO_AGI(agbp);
+ /*
+ * Need to figure out where to allocate the inode blocks.
+ * Ideally they should be spaced out through the a.g.
+ * For now, just allocate blocks up front.
+ */
+ args.agbno = INT_GET(agi->agi_root, ARCH_CONVERT);
+ args.fsbno = XFS_AGB_TO_FSB(args.mp, INT_GET(agi->agi_seqno, ARCH_CONVERT),
+ args.agbno);
+ /*
+ * Allocate a fixed-size extent of inodes.
+ */
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.mod = args.total = args.wasdel = args.isfl = args.userdata =
+ args.minalignslop = 0;
+ args.prod = 1;
+ /*
+ * Allow space for the inode btree to split.
+ */
+ args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+
+ /*
+ * If stripe alignment is turned on, then try again with cluster
+ * alignment.
+ */
+ if (isaligned && args.fsbno == NULLFSBLOCK) {
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.agbno = INT_GET(agi->agi_root, ARCH_CONVERT);
+ args.fsbno = XFS_AGB_TO_FSB(args.mp,
+ INT_GET(agi->agi_seqno, ARCH_CONVERT), args.agbno);
+ if (XFS_SB_VERSION_HASALIGN(&args.mp->m_sb) &&
+ args.mp->m_sb.sb_inoalignmt >=
+ XFS_B_TO_FSBT(args.mp, XFS_INODE_CLUSTER_SIZE(args.mp)))
+ args.alignment = args.mp->m_sb.sb_inoalignmt;
+ else
+ args.alignment = 1;
+ if ((error = xfs_alloc_vextent(&args)))
+ return error;
+ }
+
+ if (args.fsbno == NULLFSBLOCK) {
+ *alloc = 0;
+ return 0;
+ }
+ ASSERT(args.len == args.minlen);
+ /*
+ * Convert the results.
+ */
+ newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
+ /*
+ * Loop over the new block(s), filling in the inodes.
+ * For small block sizes, manipulate the inodes in buffers
+ * which are multiples of the blocks size.
+ */
+ if (args.mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(args.mp)) {
+ blks_per_cluster = 1;
+ nbufs = (int)args.len;
+ ninodes = args.mp->m_sb.sb_inopblock;
+ } else {
+ blks_per_cluster = XFS_INODE_CLUSTER_SIZE(args.mp) /
+ args.mp->m_sb.sb_blocksize;
+ nbufs = (int)args.len / blks_per_cluster;
+ ninodes = blks_per_cluster * args.mp->m_sb.sb_inopblock;
+ }
+ /*
+ * Figure out what version number to use in the inodes we create.
+ * If the superblock version has caught up to the one that supports
+ * the new inode format, then use the new inode version. Otherwise
+ * use the old version so that old kernels will continue to be
+ * able to use the file system.
+ */
+ if (XFS_SB_VERSION_HASNLINK(&args.mp->m_sb))
+ version = XFS_DINODE_VERSION_2;
+ else
+ version = XFS_DINODE_VERSION_1;
+
+ memset(&dic, 0, sizeof(xfs_dinode_core_t));
+ INT_SET(dic.di_magic, ARCH_CONVERT, XFS_DINODE_MAGIC);
+ INT_SET(dic.di_version, ARCH_CONVERT, version);
+
+ for (j = 0; j < nbufs; j++) {
+ /*
+ * Get the block.
+ */
+ d = XFS_AGB_TO_DADDR(args.mp, INT_GET(agi->agi_seqno, ARCH_CONVERT),
+ args.agbno + (j * blks_per_cluster));
+ fbuf = xfs_trans_get_buf(tp, args.mp->m_ddev_targp, d,
+ args.mp->m_bsize * blks_per_cluster,
+ XFS_BUF_LOCK);
+ ASSERT(fbuf);
+ ASSERT(!XFS_BUF_GETERROR(fbuf));
+ /*
+ * Loop over the inodes in this buffer.
+ */
+
+ for (i = 0; i < ninodes; i++) {
+ free = XFS_MAKE_IPTR(args.mp, fbuf, i);
+ memcpy(&(free->di_core), &dic, sizeof(xfs_dinode_core_t));
+ INT_SET(free->di_next_unlinked, ARCH_CONVERT, NULLAGINO);
+ xfs_ialloc_log_di(tp, fbuf, i,
+ XFS_DI_CORE_BITS | XFS_DI_NEXT_UNLINKED);
+ }
+ xfs_trans_inode_alloc_buf(tp, fbuf);
+ }
+ INT_MOD(agi->agi_count, ARCH_CONVERT, newlen);
+ INT_MOD(agi->agi_freecount, ARCH_CONVERT, newlen);
+ down_read(&args.mp->m_peraglock);
+ args.mp->m_perag[INT_GET(agi->agi_seqno, ARCH_CONVERT)].pagi_freecount += newlen;
+ up_read(&args.mp->m_peraglock);
+ INT_SET(agi->agi_newino, ARCH_CONVERT, newino);
+ /*
+ * Insert records describing the new inode chunk into the btree.
+ */
+ cur = xfs_btree_init_cursor(args.mp, tp, agbp,
+ INT_GET(agi->agi_seqno, ARCH_CONVERT),
+ XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
+ for (thisino = newino;
+ thisino < newino + newlen;
+ thisino += XFS_INODES_PER_CHUNK) {
+ if ((error = xfs_inobt_lookup_eq(cur, thisino,
+ XFS_INODES_PER_CHUNK, XFS_INOBT_ALL_FREE, &i))) {
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+ }
+ ASSERT(i == 0);
+ if ((error = xfs_inobt_insert(cur, &i))) {
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+ }
+ ASSERT(i == 1);
+ }
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ /*
+ * Log allocation group header fields
+ */
+ xfs_ialloc_log_agi(tp, agbp,
+ XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO);
+ /*
+ * Modify/log superblock values for inode count and inode free count.
+ */
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, (long)newlen);
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, (long)newlen);
+ *alloc = 1;
+ return 0;
+}
+
+STATIC __inline xfs_agnumber_t
+xfs_ialloc_next_ag(
+ xfs_mount_t *mp)
+{
+ xfs_agnumber_t agno;
+
+ spin_lock(&mp->m_agirotor_lock);
+ agno = mp->m_agirotor;
+ if (++mp->m_agirotor == mp->m_maxagi)
+ mp->m_agirotor = 0;
+ spin_unlock(&mp->m_agirotor_lock);
+
+ return agno;
+}
+
+/*
+ * Select an allocation group to look for a free inode in, based on the parent
+ * inode and then mode. Return the allocation group buffer.
+ */
+STATIC xfs_buf_t * /* allocation group buffer */
+xfs_ialloc_ag_select(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_ino_t parent, /* parent directory inode number */
+ mode_t mode, /* bits set to indicate file type */
+ int okalloc) /* ok to allocate more space */
+{
+ xfs_buf_t *agbp; /* allocation group header buffer */
+ xfs_agnumber_t agcount; /* number of ag's in the filesystem */
+ xfs_agnumber_t agno; /* current ag number */
+ int flags; /* alloc buffer locking flags */
+ xfs_extlen_t ineed; /* blocks needed for inode allocation */
+ xfs_extlen_t longest = 0; /* longest extent available */
+ xfs_mount_t *mp; /* mount point structure */
+ int needspace; /* file mode implies space allocated */
+ xfs_perag_t *pag; /* per allocation group data */
+ xfs_agnumber_t pagno; /* parent (starting) ag number */
+
+ /*
+ * Files of these types need at least one block if length > 0
+ * (and they won't fit in the inode, but that's hard to figure out).
+ */
+ needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode);
+ mp = tp->t_mountp;
+ agcount = mp->m_maxagi;
+ if (S_ISDIR(mode))
+ pagno = xfs_ialloc_next_ag(mp);
+ else {
+ pagno = XFS_INO_TO_AGNO(mp, parent);
+ if (pagno >= agcount)
+ pagno = 0;
+ }
+ ASSERT(pagno < agcount);
+ /*
+ * Loop through allocation groups, looking for one with a little
+ * free space in it. Note we don't look for free inodes, exactly.
+ * Instead, we include whether there is a need to allocate inodes
+ * to mean that blocks must be allocated for them,
+ * if none are currently free.
+ */
+ agno = pagno;
+ flags = XFS_ALLOC_FLAG_TRYLOCK;
+ down_read(&mp->m_peraglock);
+ for (;;) {
+ pag = &mp->m_perag[agno];
+ if (!pag->pagi_init) {
+ if (xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
+ agbp = NULL;
+ goto nextag;
+ }
+ } else
+ agbp = NULL;
+
+ if (!pag->pagi_inodeok) {
+ xfs_ialloc_next_ag(mp);
+ goto unlock_nextag;
+ }
+
+ /*
+ * Is there enough free space for the file plus a block
+ * of inodes (if we need to allocate some)?
+ */
+ ineed = pag->pagi_freecount ? 0 : XFS_IALLOC_BLOCKS(mp);
+ if (ineed && !pag->pagf_init) {
+ if (agbp == NULL &&
+ xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
+ agbp = NULL;
+ goto nextag;
+ }
+ (void)xfs_alloc_pagf_init(mp, tp, agno, flags);
+ }
+ if (!ineed || pag->pagf_init) {
+ if (ineed && !(longest = pag->pagf_longest))
+ longest = pag->pagf_flcount > 0;
+ if (!ineed ||
+ (pag->pagf_freeblks >= needspace + ineed &&
+ longest >= ineed &&
+ okalloc)) {
+ if (agbp == NULL &&
+ xfs_ialloc_read_agi(mp, tp, agno, &agbp)) {
+ agbp = NULL;
+ goto nextag;
+ }
+ up_read(&mp->m_peraglock);
+ return agbp;
+ }
+ }
+unlock_nextag:
+ if (agbp)
+ xfs_trans_brelse(tp, agbp);
+nextag:
+ /*
+ * No point in iterating over the rest, if we're shutting
+ * down.
+ */
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ up_read(&mp->m_peraglock);
+ return (xfs_buf_t *)0;
+ }
+ agno++;
+ if (agno >= agcount)
+ agno = 0;
+ if (agno == pagno) {
+ if (flags == 0) {
+ up_read(&mp->m_peraglock);
+ return (xfs_buf_t *)0;
+ }
+ flags = 0;
+ }
+ }
+}
+
+/*
+ * Visible inode allocation functions.
+ */
+
+/*
+ * Allocate an inode on disk.
+ * Mode is used to tell whether the new inode will need space, and whether
+ * it is a directory.
+ *
+ * The arguments IO_agbp and alloc_done are defined to work within
+ * the constraint of one allocation per transaction.
+ * xfs_dialloc() is designed to be called twice if it has to do an
+ * allocation to make more free inodes. On the first call,
+ * IO_agbp should be set to NULL. If an inode is available,
+ * i.e., xfs_dialloc() did not need to do an allocation, an inode
+ * number is returned. In this case, IO_agbp would be set to the
+ * current ag_buf and alloc_done set to false.
+ * If an allocation needed to be done, xfs_dialloc would return
+ * the current ag_buf in IO_agbp and set alloc_done to true.
+ * The caller should then commit the current transaction, allocate a new
+ * transaction, and call xfs_dialloc() again, passing in the previous
+ * value of IO_agbp. IO_agbp should be held across the transactions.
+ * Since the agbp is locked across the two calls, the second call is
+ * guaranteed to have a free inode available.
+ *
+ * Once we successfully pick an inode its number is returned and the
+ * on-disk data structures are updated. The inode itself is not read
+ * in, since doing so would break ordering constraints with xfs_reclaim.
+ */
+int
+xfs_dialloc(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_ino_t parent, /* parent inode (directory) */
+ mode_t mode, /* mode bits for new inode */
+ int okalloc, /* ok to allocate more space */
+ xfs_buf_t **IO_agbp, /* in/out ag header's buffer */
+ boolean_t *alloc_done, /* true if we needed to replenish
+ inode freelist */
+ xfs_ino_t *inop) /* inode number allocated */
+{
+ xfs_agnumber_t agcount; /* number of allocation groups */
+ xfs_buf_t *agbp; /* allocation group header's buffer */
+ xfs_agnumber_t agno; /* allocation group number */
+ xfs_agi_t *agi; /* allocation group header structure */
+ xfs_btree_cur_t *cur; /* inode allocation btree cursor */
+ int error; /* error return value */
+ int i; /* result code */
+ int ialloced; /* inode allocation status */
+ int noroom = 0; /* no space for inode blk allocation */
+ xfs_ino_t ino; /* fs-relative inode to be returned */
+ /* REFERENCED */
+ int j; /* result code */
+ xfs_mount_t *mp; /* file system mount structure */
+ int offset; /* index of inode in chunk */
+ xfs_agino_t pagino; /* parent's a.g. relative inode # */
+ xfs_agnumber_t pagno; /* parent's allocation group number */
+ xfs_inobt_rec_t rec; /* inode allocation record */
+ xfs_agnumber_t tagno; /* testing allocation group number */
+ xfs_btree_cur_t *tcur; /* temp cursor */
+ xfs_inobt_rec_t trec; /* temp inode allocation record */
+
+
+ if (*IO_agbp == NULL) {
+ /*
+ * We do not have an agbp, so select an initial allocation
+ * group for inode allocation.
+ */
+ agbp = xfs_ialloc_ag_select(tp, parent, mode, okalloc);
+ /*
+ * Couldn't find an allocation group satisfying the
+ * criteria, give up.
+ */
+ if (!agbp) {
+ *inop = NULLFSINO;
+ return 0;
+ }
+ agi = XFS_BUF_TO_AGI(agbp);
+ ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC);
+ } else {
+ /*
+ * Continue where we left off before. In this case, we
+ * know that the allocation group has free inodes.
+ */
+ agbp = *IO_agbp;
+ agi = XFS_BUF_TO_AGI(agbp);
+ ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC);
+ ASSERT(INT_GET(agi->agi_freecount, ARCH_CONVERT) > 0);
+ }
+ mp = tp->t_mountp;
+ agcount = mp->m_sb.sb_agcount;
+ agno = INT_GET(agi->agi_seqno, ARCH_CONVERT);
+ tagno = agno;
+ pagno = XFS_INO_TO_AGNO(mp, parent);
+ pagino = XFS_INO_TO_AGINO(mp, parent);
+
+ /*
+ * If we have already hit the ceiling of inode blocks then clear
+ * okalloc so we scan all available agi structures for a free
+ * inode.
+ */
+
+ if (mp->m_maxicount &&
+ mp->m_sb.sb_icount + XFS_IALLOC_INODES(mp) > mp->m_maxicount) {
+ noroom = 1;
+ okalloc = 0;
+ }
+
+ /*
+ * Loop until we find an allocation group that either has free inodes
+ * or in which we can allocate some inodes. Iterate through the
+ * allocation groups upward, wrapping at the end.
+ */
+ *alloc_done = B_FALSE;
+ while (INT_ISZERO(agi->agi_freecount, ARCH_CONVERT)) {
+ /*
+ * Don't do anything if we're not supposed to allocate
+ * any blocks, just go on to the next ag.
+ */
+ if (okalloc) {
+ /*
+ * Try to allocate some new inodes in the allocation
+ * group.
+ */
+ if ((error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced))) {
+ xfs_trans_brelse(tp, agbp);
+ if (error == ENOSPC) {
+ *inop = NULLFSINO;
+ return 0;
+ } else
+ return error;
+ }
+ if (ialloced) {
+ /*
+ * We successfully allocated some inodes, return
+ * the current context to the caller so that it
+ * can commit the current transaction and call
+ * us again where we left off.
+ */
+ ASSERT(INT_GET(agi->agi_freecount, ARCH_CONVERT) > 0);
+ *alloc_done = B_TRUE;
+ *IO_agbp = agbp;
+ *inop = NULLFSINO;
+ return 0;
+ }
+ }
+ /*
+ * If it failed, give up on this ag.
+ */
+ xfs_trans_brelse(tp, agbp);
+ /*
+ * Go on to the next ag: get its ag header.
+ */
+nextag:
+ if (++tagno == agcount)
+ tagno = 0;
+ if (tagno == agno) {
+ *inop = NULLFSINO;
+ return noroom ? ENOSPC : 0;
+ }
+ down_read(&mp->m_peraglock);
+ if (mp->m_perag[tagno].pagi_inodeok == 0) {
+ up_read(&mp->m_peraglock);
+ goto nextag;
+ }
+ error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp);
+ up_read(&mp->m_peraglock);
+ if (error)
+ goto nextag;
+ agi = XFS_BUF_TO_AGI(agbp);
+ ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC);
+ }
+ /*
+ * Here with an allocation group that has a free inode.
+ * Reset agno since we may have chosen a new ag in the
+ * loop above.
+ */
+ agno = tagno;
+ *IO_agbp = NULL;
+ cur = xfs_btree_init_cursor(mp, tp, agbp, INT_GET(agi->agi_seqno, ARCH_CONVERT),
+ XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
+ /*
+ * If pagino is 0 (this is the root inode allocation) use newino.
+ * This must work because we've just allocated some.
+ */
+ if (!pagino)
+ pagino = INT_GET(agi->agi_newino, ARCH_CONVERT);
+#ifdef DEBUG
+ if (cur->bc_nlevels == 1) {
+ int freecount = 0;
+
+ if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
+ goto error0;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ do {
+ if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error0;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ freecount += rec.ir_freecount;
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error0;
+ } while (i == 1);
+
+ ASSERT(freecount == INT_GET(agi->agi_freecount, ARCH_CONVERT) ||
+ XFS_FORCED_SHUTDOWN(mp));
+ }
+#endif
+ /*
+ * If in the same a.g. as the parent, try to get near the parent.
+ */
+ if (pagno == agno) {
+ if ((error = xfs_inobt_lookup_le(cur, pagino, 0, 0, &i)))
+ goto error0;
+ if (i != 0 &&
+ (error = xfs_inobt_get_rec(cur, &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free, &j, ARCH_NOCONVERT)) == 0 &&
+ j == 1 &&
+ rec.ir_freecount > 0) {
+ /*
+ * Found a free inode in the same chunk
+ * as parent, done.
+ */
+ }
+ /*
+ * In the same a.g. as parent, but parent's chunk is full.
+ */
+ else {
+ int doneleft; /* done, to the left */
+ int doneright; /* done, to the right */
+
+ if (error)
+ goto error0;
+ ASSERT(i == 1);
+ ASSERT(j == 1);
+ /*
+ * Duplicate the cursor, search left & right
+ * simultaneously.
+ */
+ if ((error = xfs_btree_dup_cursor(cur, &tcur)))
+ goto error0;
+ /*
+ * Search left with tcur, back up 1 record.
+ */
+ if ((error = xfs_inobt_decrement(tcur, 0, &i)))
+ goto error1;
+ doneleft = !i;
+ if (!doneleft) {
+ if ((error = xfs_inobt_get_rec(tcur,
+ &trec.ir_startino,
+ &trec.ir_freecount,
+ &trec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error1;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error1);
+ }
+ /*
+ * Search right with cur, go forward 1 record.
+ */
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error1;
+ doneright = !i;
+ if (!doneright) {
+ if ((error = xfs_inobt_get_rec(cur,
+ &rec.ir_startino,
+ &rec.ir_freecount,
+ &rec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error1;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error1);
+ }
+ /*
+ * Loop until we find the closest inode chunk
+ * with a free one.
+ */
+ while (!doneleft || !doneright) {
+ int useleft; /* using left inode
+ chunk this time */
+
+ /*
+ * Figure out which block is closer,
+ * if both are valid.
+ */
+ if (!doneleft && !doneright)
+ useleft =
+ pagino -
+ (trec.ir_startino +
+ XFS_INODES_PER_CHUNK - 1) <
+ rec.ir_startino - pagino;
+ else
+ useleft = !doneleft;
+ /*
+ * If checking the left, does it have
+ * free inodes?
+ */
+ if (useleft && trec.ir_freecount) {
+ /*
+ * Yes, set it up as the chunk to use.
+ */
+ rec = trec;
+ xfs_btree_del_cursor(cur,
+ XFS_BTREE_NOERROR);
+ cur = tcur;
+ break;
+ }
+ /*
+ * If checking the right, does it have
+ * free inodes?
+ */
+ if (!useleft && rec.ir_freecount) {
+ /*
+ * Yes, it's already set up.
+ */
+ xfs_btree_del_cursor(tcur,
+ XFS_BTREE_NOERROR);
+ break;
+ }
+ /*
+ * If used the left, get another one
+ * further left.
+ */
+ if (useleft) {
+ if ((error = xfs_inobt_decrement(tcur, 0,
+ &i)))
+ goto error1;
+ doneleft = !i;
+ if (!doneleft) {
+ if ((error = xfs_inobt_get_rec(
+ tcur,
+ &trec.ir_startino,
+ &trec.ir_freecount,
+ &trec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error1;
+ XFS_WANT_CORRUPTED_GOTO(i == 1,
+ error1);
+ }
+ }
+ /*
+ * If used the right, get another one
+ * further right.
+ */
+ else {
+ if ((error = xfs_inobt_increment(cur, 0,
+ &i)))
+ goto error1;
+ doneright = !i;
+ if (!doneright) {
+ if ((error = xfs_inobt_get_rec(
+ cur,
+ &rec.ir_startino,
+ &rec.ir_freecount,
+ &rec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error1;
+ XFS_WANT_CORRUPTED_GOTO(i == 1,
+ error1);
+ }
+ }
+ }
+ ASSERT(!doneleft || !doneright);
+ }
+ }
+ /*
+ * In a different a.g. from the parent.
+ * See if the most recently allocated block has any free.
+ */
+ else if (INT_GET(agi->agi_newino, ARCH_CONVERT) != NULLAGINO) {
+ if ((error = xfs_inobt_lookup_eq(cur,
+ INT_GET(agi->agi_newino, ARCH_CONVERT), 0, 0, &i)))
+ goto error0;
+ if (i == 1 &&
+ (error = xfs_inobt_get_rec(cur, &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free, &j, ARCH_NOCONVERT)) == 0 &&
+ j == 1 &&
+ rec.ir_freecount > 0) {
+ /*
+ * The last chunk allocated in the group still has
+ * a free inode.
+ */
+ }
+ /*
+ * None left in the last group, search the whole a.g.
+ */
+ else {
+ if (error)
+ goto error0;
+ if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
+ goto error0;
+ ASSERT(i == 1);
+ for (;;) {
+ if ((error = xfs_inobt_get_rec(cur,
+ &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free,
+ &i, ARCH_NOCONVERT)))
+ goto error0;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ if (rec.ir_freecount > 0)
+ break;
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error0;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ }
+ }
+ }
+ offset = XFS_IALLOC_FIND_FREE(&rec.ir_free);
+ ASSERT(offset >= 0);
+ ASSERT(offset < XFS_INODES_PER_CHUNK);
+ ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
+ XFS_INODES_PER_CHUNK) == 0);
+ ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
+ XFS_INOBT_CLR_FREE(&rec, offset, ARCH_NOCONVERT);
+ rec.ir_freecount--;
+ if ((error = xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount,
+ rec.ir_free)))
+ goto error0;
+ INT_MOD(agi->agi_freecount, ARCH_CONVERT, -1);
+ xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
+ down_read(&mp->m_peraglock);
+ mp->m_perag[tagno].pagi_freecount--;
+ up_read(&mp->m_peraglock);
+#ifdef DEBUG
+ if (cur->bc_nlevels == 1) {
+ int freecount = 0;
+
+ if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
+ goto error0;
+ do {
+ if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error0;
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ freecount += rec.ir_freecount;
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error0;
+ } while (i == 1);
+ ASSERT(freecount == INT_GET(agi->agi_freecount, ARCH_CONVERT) ||
+ XFS_FORCED_SHUTDOWN(mp));
+ }
+#endif
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
+ *inop = ino;
+ return 0;
+error1:
+ xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
+error0:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Free disk inode. Carefully avoids touching the incore inode, all
+ * manipulations incore are the caller's responsibility.
+ * The on-disk inode is not changed by this operation, only the
+ * btree (free inode mask) is changed.
+ */
+int
+xfs_difree(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_ino_t inode, /* inode to be freed */
+ xfs_bmap_free_t *flist, /* extents to free */
+ int *delete, /* set if inode cluster was deleted */
+ xfs_ino_t *first_ino) /* first inode in deleted cluster */
+{
+ /* REFERENCED */
+ xfs_agblock_t agbno; /* block number containing inode */
+ xfs_buf_t *agbp; /* buffer containing allocation group header */
+ xfs_agino_t agino; /* inode number relative to allocation group */
+ xfs_agnumber_t agno; /* allocation group number */
+ xfs_agi_t *agi; /* allocation group header */
+ xfs_btree_cur_t *cur; /* inode btree cursor */
+ int error; /* error return value */
+ int i; /* result code */
+ int ilen; /* inodes in an inode cluster */
+ xfs_mount_t *mp; /* mount structure for filesystem */
+ int off; /* offset of inode in inode chunk */
+ xfs_inobt_rec_t rec; /* btree record */
+
+ mp = tp->t_mountp;
+
+ /*
+ * Break up inode number into its components.
+ */
+ agno = XFS_INO_TO_AGNO(mp, inode);
+ if (agno >= mp->m_sb.sb_agcount) {
+ cmn_err(CE_WARN,
+ "xfs_difree: agno >= mp->m_sb.sb_agcount (%d >= %d) on %s. Returning EINVAL.",
+ agno, mp->m_sb.sb_agcount, mp->m_fsname);
+ ASSERT(0);
+ return XFS_ERROR(EINVAL);
+ }
+ agino = XFS_INO_TO_AGINO(mp, inode);
+ if (inode != XFS_AGINO_TO_INO(mp, agno, agino)) {
+ cmn_err(CE_WARN,
+ "xfs_difree: inode != XFS_AGINO_TO_INO() (%d != %d) on %s. Returning EINVAL.",
+ inode, XFS_AGINO_TO_INO(mp, agno, agino), mp->m_fsname);
+ ASSERT(0);
+ return XFS_ERROR(EINVAL);
+ }
+ agbno = XFS_AGINO_TO_AGBNO(mp, agino);
+ if (agbno >= mp->m_sb.sb_agblocks) {
+ cmn_err(CE_WARN,
+ "xfs_difree: agbno >= mp->m_sb.sb_agblocks (%d >= %d) on %s. Returning EINVAL.",
+ agbno, mp->m_sb.sb_agblocks, mp->m_fsname);
+ ASSERT(0);
+ return XFS_ERROR(EINVAL);
+ }
+ /*
+ * Get the allocation group header.
+ */
+ down_read(&mp->m_peraglock);
+ error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
+ up_read(&mp->m_peraglock);
+ if (error) {
+ cmn_err(CE_WARN,
+ "xfs_difree: xfs_ialloc_read_agi() returned an error %d on %s. Returning error.",
+ error, mp->m_fsname);
+ return error;
+ }
+ agi = XFS_BUF_TO_AGI(agbp);
+ ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC);
+ ASSERT(agbno < INT_GET(agi->agi_length, ARCH_CONVERT));
+ /*
+ * Initialize the cursor.
+ */
+ cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
+ (xfs_inode_t *)0, 0);
+#ifdef DEBUG
+ if (cur->bc_nlevels == 1) {
+ int freecount = 0;
+
+ if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
+ goto error0;
+ do {
+ if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino,
+ &rec.ir_freecount, &rec.ir_free, &i, ARCH_NOCONVERT)))
+ goto error0;
+ if (i) {
+ freecount += rec.ir_freecount;
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error0;
+ }
+ } while (i == 1);
+ ASSERT(freecount == INT_GET(agi->agi_freecount, ARCH_CONVERT) ||
+ XFS_FORCED_SHUTDOWN(mp));
+ }
+#endif
+ /*
+ * Look for the entry describing this inode.
+ */
+ if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
+ cmn_err(CE_WARN,
+ "xfs_difree: xfs_inobt_lookup_le returned() an error %d on %s. Returning error.",
+ error, mp->m_fsname);
+ goto error0;
+ }
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ if ((error = xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount,
+ &rec.ir_free, &i, ARCH_NOCONVERT))) {
+ cmn_err(CE_WARN,
+ "xfs_difree: xfs_inobt_get_rec() returned an error %d on %s. Returning error.",
+ error, mp->m_fsname);
+ goto error0;
+ }
+ XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+ /*
+ * Get the offset in the inode chunk.
+ */
+ off = agino - rec.ir_startino;
+ ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK);
+ ASSERT(!XFS_INOBT_IS_FREE(&rec, off, ARCH_NOCONVERT));
+ /*
+ * Mark the inode free & increment the count.
+ */
+ XFS_INOBT_SET_FREE(&rec, off, ARCH_NOCONVERT);
+ rec.ir_freecount++;
+
+ /*
+ * When an inode cluster is free, it becomes elgible for removal
+ */
+ if ((mp->m_flags & XFS_MOUNT_IDELETE) &&
+ (rec.ir_freecount == XFS_IALLOC_INODES(mp))) {
+
+ *delete = 1;
+ *first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
+
+ /*
+ * Remove the inode cluster from the AGI B+Tree, adjust the
+ * AGI and Superblock inode counts, and mark the disk space
+ * to be freed when the transaction is committed.
+ */
+ ilen = XFS_IALLOC_INODES(mp);
+ INT_MOD(agi->agi_count, ARCH_CONVERT, -ilen);
+ INT_MOD(agi->agi_freecount, ARCH_CONVERT, -(ilen - 1));
+ xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
+ down_read(&mp->m_peraglock);
+ mp->m_perag[agno].pagi_freecount -= ilen - 1;
+ up_read(&mp->m_peraglock);
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
+
+ if ((error = xfs_inobt_delete(cur, &i))) {
+ cmn_err(CE_WARN, "xfs_difree: xfs_inobt_delete returned an error %d on %s.\n",
+ error, mp->m_fsname);
+ goto error0;
+ }
+
+ xfs_bmap_add_free(XFS_AGB_TO_FSB(mp,
+ agno, XFS_INO_TO_AGBNO(mp,rec.ir_startino)),
+ XFS_IALLOC_BLOCKS(mp), flist, mp);
+ } else {
+ *delete = 0;
+
+ if ((error = xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount, rec.ir_free))) {
+ cmn_err(CE_WARN,
+ "xfs_difree: xfs_inobt_update() returned an error %d on %s. Returning error.",
+ error, mp->m_fsname);
+ goto error0;
+ }
+ /*
+ * Change the inode free counts and log the ag/sb changes.
+ */
+ INT_MOD(agi->agi_freecount, ARCH_CONVERT, 1);
+ xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
+ down_read(&mp->m_peraglock);
+ mp->m_perag[agno].pagi_freecount++;
+ up_read(&mp->m_peraglock);
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
+ }
+
+#ifdef DEBUG
+ if (cur->bc_nlevels == 1) {
+ int freecount = 0;
+
+ if ((error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i)))
+ goto error0;
+ do {
+ if ((error = xfs_inobt_get_rec(cur,
+ &rec.ir_startino,
+ &rec.ir_freecount,
+ &rec.ir_free, &i,
+ ARCH_NOCONVERT)))
+ goto error0;
+ if (i) {
+ freecount += rec.ir_freecount;
+ if ((error = xfs_inobt_increment(cur, 0, &i)))
+ goto error0;
+ }
+ } while (i == 1);
+ ASSERT(freecount == INT_GET(agi->agi_freecount, ARCH_CONVERT) ||
+ XFS_FORCED_SHUTDOWN(mp));
+ }
+#endif
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ return 0;
+
+error0:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Return the location of the inode in bno/off, for mapping it into a buffer.
+ */
+/*ARGSUSED*/
+int
+xfs_dilocate(
+ xfs_mount_t *mp, /* file system mount structure */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_ino_t ino, /* inode to locate */
+ xfs_fsblock_t *bno, /* output: block containing inode */
+ int *len, /* output: num blocks in inode cluster */
+ int *off, /* output: index in block of inode */
+ uint flags) /* flags concerning inode lookup */
+{
+ xfs_agblock_t agbno; /* block number of inode in the alloc group */
+ xfs_buf_t *agbp; /* agi buffer */
+ xfs_agino_t agino; /* inode number within alloc group */
+ xfs_agnumber_t agno; /* allocation group number */
+ int blks_per_cluster; /* num blocks per inode cluster */
+ xfs_agblock_t chunk_agbno; /* first block in inode chunk */
+ xfs_agino_t chunk_agino; /* first agino in inode chunk */
+ __int32_t chunk_cnt; /* count of free inodes in chunk */
+ xfs_inofree_t chunk_free; /* mask of free inodes in chunk */
+ xfs_agblock_t cluster_agbno; /* first block in inode cluster */
+ xfs_btree_cur_t *cur; /* inode btree cursor */
+ int error; /* error code */
+ int i; /* temp state */
+ int offset; /* index of inode in its buffer */
+ int offset_agbno; /* blks from chunk start to inode */
+
+ ASSERT(ino != NULLFSINO);
+ /*
+ * Split up the inode number into its parts.
+ */
+ agno = XFS_INO_TO_AGNO(mp, ino);
+ agino = XFS_INO_TO_AGINO(mp, ino);
+ agbno = XFS_AGINO_TO_AGBNO(mp, agino);
+ if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
+ ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
+#ifdef DEBUG
+ if (agno >= mp->m_sb.sb_agcount) {
+ xfs_fs_cmn_err(CE_ALERT, mp,
+ "xfs_dilocate: agno (%d) >= "
+ "mp->m_sb.sb_agcount (%d)",
+ agno, mp->m_sb.sb_agcount);
+ }
+ if (agbno >= mp->m_sb.sb_agblocks) {
+ xfs_fs_cmn_err(CE_ALERT, mp,
+ "xfs_dilocate: agbno (0x%llx) >= "
+ "mp->m_sb.sb_agblocks (0x%lx)",
+ (unsigned long long) agbno,
+ (unsigned long) mp->m_sb.sb_agblocks);
+ }
+ if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
+ xfs_fs_cmn_err(CE_ALERT, mp,
+ "xfs_dilocate: ino (0x%llx) != "
+ "XFS_AGINO_TO_INO(mp, agno, agino) "
+ "(0x%llx)",
+ ino, XFS_AGINO_TO_INO(mp, agno, agino));
+ }
+#endif /* DEBUG */
+ return XFS_ERROR(EINVAL);
+ }
+ if ((mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) ||
+ !(flags & XFS_IMAP_LOOKUP)) {
+ offset = XFS_INO_TO_OFFSET(mp, ino);
+ ASSERT(offset < mp->m_sb.sb_inopblock);
+ *bno = XFS_AGB_TO_FSB(mp, agno, agbno);
+ *off = offset;
+ *len = 1;
+ return 0;
+ }
+ blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog;
+ if (*bno != NULLFSBLOCK) {
+ offset = XFS_INO_TO_OFFSET(mp, ino);
+ ASSERT(offset < mp->m_sb.sb_inopblock);
+ cluster_agbno = XFS_FSB_TO_AGBNO(mp, *bno);
+ *off = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
+ offset;
+ *len = blks_per_cluster;
+ return 0;
+ }
+ if (mp->m_inoalign_mask) {
+ offset_agbno = agbno & mp->m_inoalign_mask;
+ chunk_agbno = agbno - offset_agbno;
+ } else {
+ down_read(&mp->m_peraglock);
+ error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
+ up_read(&mp->m_peraglock);
+ if (error) {
+#ifdef DEBUG
+ xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
+ "xfs_ialloc_read_agi() returned "
+ "error %d, agno %d",
+ error, agno);
+#endif /* DEBUG */
+ return error;
+ }
+ cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
+ (xfs_inode_t *)0, 0);
+ if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
+#ifdef DEBUG
+ xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
+ "xfs_inobt_lookup_le() failed");
+#endif /* DEBUG */
+ goto error0;
+ }
+ if ((error = xfs_inobt_get_rec(cur, &chunk_agino, &chunk_cnt,
+ &chunk_free, &i, ARCH_NOCONVERT))) {
+#ifdef DEBUG
+ xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
+ "xfs_inobt_get_rec() failed");
+#endif /* DEBUG */
+ goto error0;
+ }
+ if (i == 0) {
+#ifdef DEBUG
+ xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
+ "xfs_inobt_get_rec() failed");
+#endif /* DEBUG */
+ error = XFS_ERROR(EINVAL);
+ }
+ xfs_trans_brelse(tp, agbp);
+ xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+ if (error)
+ return error;
+ chunk_agbno = XFS_AGINO_TO_AGBNO(mp, chunk_agino);
+ offset_agbno = agbno - chunk_agbno;
+ }
+ ASSERT(agbno >= chunk_agbno);
+ cluster_agbno = chunk_agbno +
+ ((offset_agbno / blks_per_cluster) * blks_per_cluster);
+ offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
+ XFS_INO_TO_OFFSET(mp, ino);
+ *bno = XFS_AGB_TO_FSB(mp, agno, cluster_agbno);
+ *off = offset;
+ *len = blks_per_cluster;
+ return 0;
+error0:
+ xfs_trans_brelse(tp, agbp);
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ return error;
+}
+
+/*
+ * Compute and fill in value of m_in_maxlevels.
+ */
+void
+xfs_ialloc_compute_maxlevels(
+ xfs_mount_t *mp) /* file system mount structure */
+{
+ int level;
+ uint maxblocks;
+ uint maxleafents;
+ int minleafrecs;
+ int minnoderecs;
+
+ maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >>
+ XFS_INODES_PER_CHUNK_LOG;
+ minleafrecs = mp->m_alloc_mnr[0];
+ minnoderecs = mp->m_alloc_mnr[1];
+ maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
+ for (level = 1; maxblocks > 1; level++)
+ maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
+ mp->m_in_maxlevels = level;
+}
+
+/*
+ * Log specified fields for the ag hdr (inode section)
+ */
+void
+xfs_ialloc_log_agi(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_buf_t *bp, /* allocation group header buffer */
+ int fields) /* bitmask of fields to log */
+{
+ int first; /* first byte number */
+ int last; /* last byte number */
+ static const short offsets[] = { /* field starting offsets */
+ /* keep in sync with bit definitions */
+ offsetof(xfs_agi_t, agi_magicnum),
+ offsetof(xfs_agi_t, agi_versionnum),
+ offsetof(xfs_agi_t, agi_seqno),
+ offsetof(xfs_agi_t, agi_length),
+ offsetof(xfs_agi_t, agi_count),
+ offsetof(xfs_agi_t, agi_root),
+ offsetof(xfs_agi_t, agi_level),
+ offsetof(xfs_agi_t, agi_freecount),
+ offsetof(xfs_agi_t, agi_newino),
+ offsetof(xfs_agi_t, agi_dirino),
+ offsetof(xfs_agi_t, agi_unlinked),
+ sizeof(xfs_agi_t)
+ };
+#ifdef DEBUG
+ xfs_agi_t *agi; /* allocation group header */
+
+ agi = XFS_BUF_TO_AGI(bp);
+ ASSERT(INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC);
+#endif
+ /*
+ * Compute byte offsets for the first and last fields.
+ */
+ xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS, &first, &last);
+ /*
+ * Log the allocation group inode header buffer.
+ */
+ xfs_trans_log_buf(tp, bp, first, last);
+}
+
+/*
+ * Read in the allocation group header (inode allocation section)
+ */
+int
+xfs_ialloc_read_agi(
+ xfs_mount_t *mp, /* file system mount structure */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_agnumber_t agno, /* allocation group number */
+ xfs_buf_t **bpp) /* allocation group hdr buf */
+{
+ xfs_agi_t *agi; /* allocation group header */
+ int agi_ok; /* agi is consistent */
+ xfs_buf_t *bp; /* allocation group hdr buf */
+ xfs_perag_t *pag; /* per allocation group data */
+ int error;
+
+ ASSERT(agno != NULLAGNUMBER);
+ error = xfs_trans_read_buf(
+ mp, tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &bp);
+ if (error)
+ return error;
+ ASSERT(bp && !XFS_BUF_GETERROR(bp));
+
+ /*
+ * Validate the magic number of the agi block.
+ */
+ agi = XFS_BUF_TO_AGI(bp);
+ agi_ok =
+ INT_GET(agi->agi_magicnum, ARCH_CONVERT) == XFS_AGI_MAGIC &&
+ XFS_AGI_GOOD_VERSION(
+ INT_GET(agi->agi_versionnum, ARCH_CONVERT));
+ if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IALLOC_READ_AGI,
+ XFS_RANDOM_IALLOC_READ_AGI))) {
+ XFS_CORRUPTION_ERROR("xfs_ialloc_read_agi", XFS_ERRLEVEL_LOW,
+ mp, agi);
+ xfs_trans_brelse(tp, bp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ pag = &mp->m_perag[agno];
+ if (!pag->pagi_init) {
+ pag->pagi_freecount = INT_GET(agi->agi_freecount, ARCH_CONVERT);
+ pag->pagi_init = 1;
+ } else {
+ /*
+ * It's possible for these to be out of sync if
+ * we are in the middle of a forced shutdown.
+ */
+ ASSERT(pag->pagi_freecount ==
+ INT_GET(agi->agi_freecount, ARCH_CONVERT)
+ || XFS_FORCED_SHUTDOWN(mp));
+ }
+
+#ifdef DEBUG
+ {
+ int i;
+
+ for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++)
+ ASSERT(!INT_ISZERO(agi->agi_unlinked[i], ARCH_CONVERT));
+ }
+#endif
+
+ XFS_BUF_SET_VTYPE_REF(bp, B_FS_AGI, XFS_AGI_REF);
+ *bpp = bp;
+ return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)