summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_fsops.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_fsops.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/xfs/xfs_fsops.c')
-rw-r--r--fs/xfs/xfs_fsops.c616
1 files changed, 616 insertions, 0 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
new file mode 100644
index 000000000000..21213057c27f
--- /dev/null
+++ b/fs/xfs/xfs_fsops.c
@@ -0,0 +1,616 @@
+/*
+ * 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_dir.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_ag.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_error.h"
+#include "xfs_alloc.h"
+#include "xfs_ialloc.h"
+#include "xfs_fsops.h"
+#include "xfs_itable.h"
+#include "xfs_rw.h"
+#include "xfs_refcache.h"
+#include "xfs_trans_space.h"
+#include "xfs_rtalloc.h"
+#include "xfs_dir2.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_inode_item.h"
+
+/*
+ * File system operations
+ */
+
+int
+xfs_fs_geometry(
+ xfs_mount_t *mp,
+ xfs_fsop_geom_t *geo,
+ int new_version)
+{
+ geo->blocksize = mp->m_sb.sb_blocksize;
+ geo->rtextsize = mp->m_sb.sb_rextsize;
+ geo->agblocks = mp->m_sb.sb_agblocks;
+ geo->agcount = mp->m_sb.sb_agcount;
+ geo->logblocks = mp->m_sb.sb_logblocks;
+ geo->sectsize = mp->m_sb.sb_sectsize;
+ geo->inodesize = mp->m_sb.sb_inodesize;
+ geo->imaxpct = mp->m_sb.sb_imax_pct;
+ geo->datablocks = mp->m_sb.sb_dblocks;
+ geo->rtblocks = mp->m_sb.sb_rblocks;
+ geo->rtextents = mp->m_sb.sb_rextents;
+ geo->logstart = mp->m_sb.sb_logstart;
+ ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
+ memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
+ if (new_version >= 2) {
+ geo->sunit = mp->m_sb.sb_unit;
+ geo->swidth = mp->m_sb.sb_width;
+ }
+ if (new_version >= 3) {
+ geo->version = XFS_FSOP_GEOM_VERSION;
+ geo->flags =
+ (XFS_SB_VERSION_HASATTR(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
+ (XFS_SB_VERSION_HASNLINK(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
+ (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
+ (XFS_SB_VERSION_HASALIGN(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
+ (XFS_SB_VERSION_HASDALIGN(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
+ (XFS_SB_VERSION_HASSHARED(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
+ (XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
+ (XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
+ (XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_SECTOR : 0);
+ geo->logsectsize = XFS_SB_VERSION_HASSECTOR(&mp->m_sb) ?
+ mp->m_sb.sb_logsectsize : BBSIZE;
+ geo->rtsectsize = mp->m_sb.sb_blocksize;
+ geo->dirblocksize = mp->m_dirblksize;
+ }
+ if (new_version >= 4) {
+ geo->flags |=
+ (XFS_SB_VERSION_HASLOGV2(&mp->m_sb) ?
+ XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
+ geo->logsunit = mp->m_sb.sb_logsunit;
+ }
+ return 0;
+}
+
+static int
+xfs_growfs_data_private(
+ xfs_mount_t *mp, /* mount point for filesystem */
+ xfs_growfs_data_t *in) /* growfs data input struct */
+{
+ xfs_agf_t *agf;
+ xfs_agi_t *agi;
+ xfs_agnumber_t agno;
+ xfs_extlen_t agsize;
+ xfs_extlen_t tmpsize;
+ xfs_alloc_rec_t *arec;
+ xfs_btree_sblock_t *block;
+ xfs_buf_t *bp;
+ int bucket;
+ int dpct;
+ int error;
+ xfs_agnumber_t nagcount;
+ xfs_agnumber_t nagimax = 0;
+ xfs_rfsblock_t nb, nb_mod;
+ xfs_rfsblock_t new;
+ xfs_rfsblock_t nfree;
+ xfs_agnumber_t oagcount;
+ int pct;
+ xfs_sb_t *sbp;
+ xfs_trans_t *tp;
+
+ nb = in->newblocks;
+ pct = in->imaxpct;
+ if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
+ return XFS_ERROR(EINVAL);
+ dpct = pct - mp->m_sb.sb_imax_pct;
+ error = xfs_read_buf(mp, mp->m_ddev_targp,
+ XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
+ XFS_FSS_TO_BB(mp, 1), 0, &bp);
+ if (error)
+ return error;
+ ASSERT(bp);
+ xfs_buf_relse(bp);
+
+ new = nb; /* use new as a temporary here */
+ nb_mod = do_div(new, mp->m_sb.sb_agblocks);
+ nagcount = new + (nb_mod != 0);
+ if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
+ nagcount--;
+ nb = nagcount * mp->m_sb.sb_agblocks;
+ if (nb < mp->m_sb.sb_dblocks)
+ return XFS_ERROR(EINVAL);
+ }
+ new = nb - mp->m_sb.sb_dblocks;
+ oagcount = mp->m_sb.sb_agcount;
+ if (nagcount > oagcount) {
+ down_write(&mp->m_peraglock);
+ mp->m_perag = kmem_realloc(mp->m_perag,
+ sizeof(xfs_perag_t) * nagcount,
+ sizeof(xfs_perag_t) * oagcount,
+ KM_SLEEP);
+ memset(&mp->m_perag[oagcount], 0,
+ (nagcount - oagcount) * sizeof(xfs_perag_t));
+ mp->m_flags |= XFS_MOUNT_32BITINODES;
+ nagimax = xfs_initialize_perag(mp, nagcount);
+ up_write(&mp->m_peraglock);
+ }
+ tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
+ if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
+ XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+
+ nfree = 0;
+ for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
+ /*
+ * AG freelist header block
+ */
+ bp = xfs_buf_get(mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0);
+ agf = XFS_BUF_TO_AGF(bp);
+ memset(agf, 0, mp->m_sb.sb_sectsize);
+ INT_SET(agf->agf_magicnum, ARCH_CONVERT, XFS_AGF_MAGIC);
+ INT_SET(agf->agf_versionnum, ARCH_CONVERT, XFS_AGF_VERSION);
+ INT_SET(agf->agf_seqno, ARCH_CONVERT, agno);
+ if (agno == nagcount - 1)
+ agsize =
+ nb -
+ (agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
+ else
+ agsize = mp->m_sb.sb_agblocks;
+ INT_SET(agf->agf_length, ARCH_CONVERT, agsize);
+ INT_SET(agf->agf_roots[XFS_BTNUM_BNOi], ARCH_CONVERT,
+ XFS_BNO_BLOCK(mp));
+ INT_SET(agf->agf_roots[XFS_BTNUM_CNTi], ARCH_CONVERT,
+ XFS_CNT_BLOCK(mp));
+ INT_SET(agf->agf_levels[XFS_BTNUM_BNOi], ARCH_CONVERT, 1);
+ INT_SET(agf->agf_levels[XFS_BTNUM_CNTi], ARCH_CONVERT, 1);
+ agf->agf_flfirst = 0;
+ INT_SET(agf->agf_fllast, ARCH_CONVERT, XFS_AGFL_SIZE(mp) - 1);
+ agf->agf_flcount = 0;
+ tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
+ INT_SET(agf->agf_freeblks, ARCH_CONVERT, tmpsize);
+ INT_SET(agf->agf_longest, ARCH_CONVERT, tmpsize);
+ error = xfs_bwrite(mp, bp);
+ if (error) {
+ goto error0;
+ }
+ /*
+ * AG inode header block
+ */
+ bp = xfs_buf_get(mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0);
+ agi = XFS_BUF_TO_AGI(bp);
+ memset(agi, 0, mp->m_sb.sb_sectsize);
+ INT_SET(agi->agi_magicnum, ARCH_CONVERT, XFS_AGI_MAGIC);
+ INT_SET(agi->agi_versionnum, ARCH_CONVERT, XFS_AGI_VERSION);
+ INT_SET(agi->agi_seqno, ARCH_CONVERT, agno);
+ INT_SET(agi->agi_length, ARCH_CONVERT, agsize);
+ agi->agi_count = 0;
+ INT_SET(agi->agi_root, ARCH_CONVERT, XFS_IBT_BLOCK(mp));
+ INT_SET(agi->agi_level, ARCH_CONVERT, 1);
+ agi->agi_freecount = 0;
+ INT_SET(agi->agi_newino, ARCH_CONVERT, NULLAGINO);
+ INT_SET(agi->agi_dirino, ARCH_CONVERT, NULLAGINO);
+ for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
+ INT_SET(agi->agi_unlinked[bucket], ARCH_CONVERT,
+ NULLAGINO);
+ error = xfs_bwrite(mp, bp);
+ if (error) {
+ goto error0;
+ }
+ /*
+ * BNO btree root block
+ */
+ bp = xfs_buf_get(mp->m_ddev_targp,
+ XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
+ BTOBB(mp->m_sb.sb_blocksize), 0);
+ block = XFS_BUF_TO_SBLOCK(bp);
+ memset(block, 0, mp->m_sb.sb_blocksize);
+ INT_SET(block->bb_magic, ARCH_CONVERT, XFS_ABTB_MAGIC);
+ block->bb_level = 0;
+ INT_SET(block->bb_numrecs, ARCH_CONVERT, 1);
+ INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLAGBLOCK);
+ INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLAGBLOCK);
+ arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
+ block, 1, mp->m_alloc_mxr[0]);
+ INT_SET(arec->ar_startblock, ARCH_CONVERT,
+ XFS_PREALLOC_BLOCKS(mp));
+ INT_SET(arec->ar_blockcount, ARCH_CONVERT,
+ agsize - INT_GET(arec->ar_startblock, ARCH_CONVERT));
+ error = xfs_bwrite(mp, bp);
+ if (error) {
+ goto error0;
+ }
+ /*
+ * CNT btree root block
+ */
+ bp = xfs_buf_get(mp->m_ddev_targp,
+ XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
+ BTOBB(mp->m_sb.sb_blocksize), 0);
+ block = XFS_BUF_TO_SBLOCK(bp);
+ memset(block, 0, mp->m_sb.sb_blocksize);
+ INT_SET(block->bb_magic, ARCH_CONVERT, XFS_ABTC_MAGIC);
+ block->bb_level = 0;
+ INT_SET(block->bb_numrecs, ARCH_CONVERT, 1);
+ INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLAGBLOCK);
+ INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLAGBLOCK);
+ arec = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_alloc,
+ block, 1, mp->m_alloc_mxr[0]);
+ INT_SET(arec->ar_startblock, ARCH_CONVERT,
+ XFS_PREALLOC_BLOCKS(mp));
+ INT_SET(arec->ar_blockcount, ARCH_CONVERT,
+ agsize - INT_GET(arec->ar_startblock, ARCH_CONVERT));
+ nfree += INT_GET(arec->ar_blockcount, ARCH_CONVERT);
+ error = xfs_bwrite(mp, bp);
+ if (error) {
+ goto error0;
+ }
+ /*
+ * INO btree root block
+ */
+ bp = xfs_buf_get(mp->m_ddev_targp,
+ XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
+ BTOBB(mp->m_sb.sb_blocksize), 0);
+ block = XFS_BUF_TO_SBLOCK(bp);
+ memset(block, 0, mp->m_sb.sb_blocksize);
+ INT_SET(block->bb_magic, ARCH_CONVERT, XFS_IBT_MAGIC);
+ block->bb_level = 0;
+ block->bb_numrecs = 0;
+ INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLAGBLOCK);
+ INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLAGBLOCK);
+ error = xfs_bwrite(mp, bp);
+ if (error) {
+ goto error0;
+ }
+ }
+ xfs_trans_agblocks_delta(tp, nfree);
+ /*
+ * There are new blocks in the old last a.g.
+ */
+ if (new) {
+ /*
+ * Change the agi length.
+ */
+ error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
+ if (error) {
+ goto error0;
+ }
+ ASSERT(bp);
+ agi = XFS_BUF_TO_AGI(bp);
+ INT_MOD(agi->agi_length, ARCH_CONVERT, new);
+ ASSERT(nagcount == oagcount ||
+ INT_GET(agi->agi_length, ARCH_CONVERT) ==
+ mp->m_sb.sb_agblocks);
+ xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
+ /*
+ * Change agf length.
+ */
+ error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
+ if (error) {
+ goto error0;
+ }
+ ASSERT(bp);
+ agf = XFS_BUF_TO_AGF(bp);
+ INT_MOD(agf->agf_length, ARCH_CONVERT, new);
+ ASSERT(INT_GET(agf->agf_length, ARCH_CONVERT) ==
+ INT_GET(agi->agi_length, ARCH_CONVERT));
+ /*
+ * Free the new space.
+ */
+ error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
+ INT_GET(agf->agf_length, ARCH_CONVERT) - new), new);
+ if (error) {
+ goto error0;
+ }
+ }
+ if (nagcount > oagcount)
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
+ if (nb > mp->m_sb.sb_dblocks)
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
+ nb - mp->m_sb.sb_dblocks);
+ if (nfree)
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
+ if (dpct)
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
+ error = xfs_trans_commit(tp, 0, NULL);
+ if (error) {
+ return error;
+ }
+ /* New allocation groups fully initialized, so update mount struct */
+ if (nagimax)
+ mp->m_maxagi = nagimax;
+ if (mp->m_sb.sb_imax_pct) {
+ __uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
+ do_div(icount, 100);
+ mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
+ } else
+ mp->m_maxicount = 0;
+ for (agno = 1; agno < nagcount; agno++) {
+ error = xfs_read_buf(mp, mp->m_ddev_targp,
+ XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &bp);
+ if (error) {
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "error %d reading secondary superblock for ag %d",
+ error, agno);
+ break;
+ }
+ sbp = XFS_BUF_TO_SBP(bp);
+ xfs_xlatesb(sbp, &mp->m_sb, -1, XFS_SB_ALL_BITS);
+ /*
+ * If we get an error writing out the alternate superblocks,
+ * just issue a warning and continue. The real work is
+ * already done and committed.
+ */
+ if (!(error = xfs_bwrite(mp, bp))) {
+ continue;
+ } else {
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "write error %d updating secondary superblock for ag %d",
+ error, agno);
+ break; /* no point in continuing */
+ }
+ }
+ return 0;
+
+ error0:
+ xfs_trans_cancel(tp, XFS_TRANS_ABORT);
+ return error;
+}
+
+static int
+xfs_growfs_log_private(
+ xfs_mount_t *mp, /* mount point for filesystem */
+ xfs_growfs_log_t *in) /* growfs log input struct */
+{
+ xfs_extlen_t nb;
+
+ nb = in->newblocks;
+ if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
+ return XFS_ERROR(EINVAL);
+ if (nb == mp->m_sb.sb_logblocks &&
+ in->isint == (mp->m_sb.sb_logstart != 0))
+ return XFS_ERROR(EINVAL);
+ /*
+ * Moving the log is hard, need new interfaces to sync
+ * the log first, hold off all activity while moving it.
+ * Can have shorter or longer log in the same space,
+ * or transform internal to external log or vice versa.
+ */
+ return XFS_ERROR(ENOSYS);
+}
+
+/*
+ * protected versions of growfs function acquire and release locks on the mount
+ * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
+ * XFS_IOC_FSGROWFSRT
+ */
+
+
+int
+xfs_growfs_data(
+ xfs_mount_t *mp,
+ xfs_growfs_data_t *in)
+{
+ int error;
+ if (!cpsema(&mp->m_growlock))
+ return XFS_ERROR(EWOULDBLOCK);
+ error = xfs_growfs_data_private(mp, in);
+ vsema(&mp->m_growlock);
+ return error;
+}
+
+int
+xfs_growfs_log(
+ xfs_mount_t *mp,
+ xfs_growfs_log_t *in)
+{
+ int error;
+ if (!cpsema(&mp->m_growlock))
+ return XFS_ERROR(EWOULDBLOCK);
+ error = xfs_growfs_log_private(mp, in);
+ vsema(&mp->m_growlock);
+ return error;
+}
+
+/*
+ * exported through ioctl XFS_IOC_FSCOUNTS
+ */
+
+int
+xfs_fs_counts(
+ xfs_mount_t *mp,
+ xfs_fsop_counts_t *cnt)
+{
+ unsigned long s;
+
+ s = XFS_SB_LOCK(mp);
+ cnt->freedata = mp->m_sb.sb_fdblocks;
+ cnt->freertx = mp->m_sb.sb_frextents;
+ cnt->freeino = mp->m_sb.sb_ifree;
+ cnt->allocino = mp->m_sb.sb_icount;
+ XFS_SB_UNLOCK(mp, s);
+ return 0;
+}
+
+/*
+ * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
+ *
+ * xfs_reserve_blocks is called to set m_resblks
+ * in the in-core mount table. The number of unused reserved blocks
+ * is kept in m_resbls_avail.
+ *
+ * Reserve the requested number of blocks if available. Otherwise return
+ * as many as possible to satisfy the request. The actual number
+ * reserved are returned in outval
+ *
+ * A null inval pointer indicates that only the current reserved blocks
+ * available should be returned no settings are changed.
+ */
+
+int
+xfs_reserve_blocks(
+ xfs_mount_t *mp,
+ __uint64_t *inval,
+ xfs_fsop_resblks_t *outval)
+{
+ __int64_t lcounter, delta;
+ __uint64_t request;
+ unsigned long s;
+
+ /* If inval is null, report current values and return */
+
+ if (inval == (__uint64_t *)NULL) {
+ outval->resblks = mp->m_resblks;
+ outval->resblks_avail = mp->m_resblks_avail;
+ return(0);
+ }
+
+ request = *inval;
+ s = XFS_SB_LOCK(mp);
+
+ /*
+ * If our previous reservation was larger than the current value,
+ * then move any unused blocks back to the free pool.
+ */
+
+ if (mp->m_resblks > request) {
+ lcounter = mp->m_resblks_avail - request;
+ if (lcounter > 0) { /* release unused blocks */
+ mp->m_sb.sb_fdblocks += lcounter;
+ mp->m_resblks_avail -= lcounter;
+ }
+ mp->m_resblks = request;
+ } else {
+ delta = request - mp->m_resblks;
+ lcounter = mp->m_sb.sb_fdblocks - delta;
+ if (lcounter < 0) {
+ /* We can't satisfy the request, just get what we can */
+ mp->m_resblks += mp->m_sb.sb_fdblocks;
+ mp->m_resblks_avail += mp->m_sb.sb_fdblocks;
+ mp->m_sb.sb_fdblocks = 0;
+ } else {
+ mp->m_sb.sb_fdblocks = lcounter;
+ mp->m_resblks = request;
+ mp->m_resblks_avail += delta;
+ }
+ }
+
+ outval->resblks = mp->m_resblks;
+ outval->resblks_avail = mp->m_resblks_avail;
+ XFS_SB_UNLOCK(mp, s);
+ return(0);
+}
+
+void
+xfs_fs_log_dummy(xfs_mount_t *mp)
+{
+ xfs_trans_t *tp;
+ xfs_inode_t *ip;
+
+
+ tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
+ atomic_inc(&mp->m_active_trans);
+ if (xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0)) {
+ xfs_trans_cancel(tp, 0);
+ return;
+ }
+
+ ip = mp->m_rootip;
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_ihold(tp, ip);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ xfs_trans_set_sync(tp);
+ xfs_trans_commit(tp, 0, NULL);
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+}
+
+int
+xfs_fs_goingdown(
+ xfs_mount_t *mp,
+ __uint32_t inflags)
+{
+ switch (inflags) {
+ case XFS_FSOP_GOING_FLAGS_DEFAULT: {
+ struct vfs *vfsp = XFS_MTOVFS(mp);
+ struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
+
+ if (sb) {
+ xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
+ thaw_bdev(sb->s_bdev, sb);
+ }
+
+ break;
+ }
+ case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
+ xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
+ break;
+ case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
+ xfs_force_shutdown(mp, XFS_FORCE_UMOUNT|XFS_LOG_IO_ERROR);
+ break;
+ default:
+ return XFS_ERROR(EINVAL);
+ }
+
+ return 0;
+}