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-rw-r--r--fs/xfs/xfs_mount.c1586
1 files changed, 1586 insertions, 0 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
new file mode 100644
index 000000000000..b57423caef9b
--- /dev/null
+++ b/fs/xfs/xfs_mount.c
@@ -0,0 +1,1586 @@
+/*
+ * Copyright (c) 2000-2004 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_rtalloc.h"
+#include "xfs_bmap.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+#include "xfs_rw.h"
+#include "xfs_quota.h"
+#include "xfs_fsops.h"
+
+STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
+STATIC int xfs_uuid_mount(xfs_mount_t *);
+STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
+
+static struct {
+ short offset;
+ short type; /* 0 = integer
+ * 1 = binary / string (no translation)
+ */
+} xfs_sb_info[] = {
+ { offsetof(xfs_sb_t, sb_magicnum), 0 },
+ { offsetof(xfs_sb_t, sb_blocksize), 0 },
+ { offsetof(xfs_sb_t, sb_dblocks), 0 },
+ { offsetof(xfs_sb_t, sb_rblocks), 0 },
+ { offsetof(xfs_sb_t, sb_rextents), 0 },
+ { offsetof(xfs_sb_t, sb_uuid), 1 },
+ { offsetof(xfs_sb_t, sb_logstart), 0 },
+ { offsetof(xfs_sb_t, sb_rootino), 0 },
+ { offsetof(xfs_sb_t, sb_rbmino), 0 },
+ { offsetof(xfs_sb_t, sb_rsumino), 0 },
+ { offsetof(xfs_sb_t, sb_rextsize), 0 },
+ { offsetof(xfs_sb_t, sb_agblocks), 0 },
+ { offsetof(xfs_sb_t, sb_agcount), 0 },
+ { offsetof(xfs_sb_t, sb_rbmblocks), 0 },
+ { offsetof(xfs_sb_t, sb_logblocks), 0 },
+ { offsetof(xfs_sb_t, sb_versionnum), 0 },
+ { offsetof(xfs_sb_t, sb_sectsize), 0 },
+ { offsetof(xfs_sb_t, sb_inodesize), 0 },
+ { offsetof(xfs_sb_t, sb_inopblock), 0 },
+ { offsetof(xfs_sb_t, sb_fname[0]), 1 },
+ { offsetof(xfs_sb_t, sb_blocklog), 0 },
+ { offsetof(xfs_sb_t, sb_sectlog), 0 },
+ { offsetof(xfs_sb_t, sb_inodelog), 0 },
+ { offsetof(xfs_sb_t, sb_inopblog), 0 },
+ { offsetof(xfs_sb_t, sb_agblklog), 0 },
+ { offsetof(xfs_sb_t, sb_rextslog), 0 },
+ { offsetof(xfs_sb_t, sb_inprogress), 0 },
+ { offsetof(xfs_sb_t, sb_imax_pct), 0 },
+ { offsetof(xfs_sb_t, sb_icount), 0 },
+ { offsetof(xfs_sb_t, sb_ifree), 0 },
+ { offsetof(xfs_sb_t, sb_fdblocks), 0 },
+ { offsetof(xfs_sb_t, sb_frextents), 0 },
+ { offsetof(xfs_sb_t, sb_uquotino), 0 },
+ { offsetof(xfs_sb_t, sb_gquotino), 0 },
+ { offsetof(xfs_sb_t, sb_qflags), 0 },
+ { offsetof(xfs_sb_t, sb_flags), 0 },
+ { offsetof(xfs_sb_t, sb_shared_vn), 0 },
+ { offsetof(xfs_sb_t, sb_inoalignmt), 0 },
+ { offsetof(xfs_sb_t, sb_unit), 0 },
+ { offsetof(xfs_sb_t, sb_width), 0 },
+ { offsetof(xfs_sb_t, sb_dirblklog), 0 },
+ { offsetof(xfs_sb_t, sb_logsectlog), 0 },
+ { offsetof(xfs_sb_t, sb_logsectsize),0 },
+ { offsetof(xfs_sb_t, sb_logsunit), 0 },
+ { offsetof(xfs_sb_t, sb_features2), 0 },
+ { sizeof(xfs_sb_t), 0 }
+};
+
+/*
+ * Return a pointer to an initialized xfs_mount structure.
+ */
+xfs_mount_t *
+xfs_mount_init(void)
+{
+ xfs_mount_t *mp;
+
+ mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
+
+ AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
+ spinlock_init(&mp->m_sb_lock, "xfs_sb");
+ mutex_init(&mp->m_ilock, MUTEX_DEFAULT, "xfs_ilock");
+ initnsema(&mp->m_growlock, 1, "xfs_grow");
+ /*
+ * Initialize the AIL.
+ */
+ xfs_trans_ail_init(mp);
+
+ atomic_set(&mp->m_active_trans, 0);
+
+ return mp;
+}
+
+/*
+ * Free up the resources associated with a mount structure. Assume that
+ * the structure was initially zeroed, so we can tell which fields got
+ * initialized.
+ */
+void
+xfs_mount_free(
+ xfs_mount_t *mp,
+ int remove_bhv)
+{
+ if (mp->m_ihash)
+ xfs_ihash_free(mp);
+ if (mp->m_chash)
+ xfs_chash_free(mp);
+
+ if (mp->m_perag) {
+ int agno;
+
+ for (agno = 0; agno < mp->m_maxagi; agno++)
+ if (mp->m_perag[agno].pagb_list)
+ kmem_free(mp->m_perag[agno].pagb_list,
+ sizeof(xfs_perag_busy_t) *
+ XFS_PAGB_NUM_SLOTS);
+ kmem_free(mp->m_perag,
+ sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
+ }
+
+ AIL_LOCK_DESTROY(&mp->m_ail_lock);
+ spinlock_destroy(&mp->m_sb_lock);
+ mutex_destroy(&mp->m_ilock);
+ freesema(&mp->m_growlock);
+ if (mp->m_quotainfo)
+ XFS_QM_DONE(mp);
+
+ if (mp->m_fsname != NULL)
+ kmem_free(mp->m_fsname, mp->m_fsname_len);
+
+ if (remove_bhv) {
+ struct vfs *vfsp = XFS_MTOVFS(mp);
+
+ bhv_remove_all_vfsops(vfsp, 0);
+ VFS_REMOVEBHV(vfsp, &mp->m_bhv);
+ }
+
+ kmem_free(mp, sizeof(xfs_mount_t));
+}
+
+
+/*
+ * Check the validity of the SB found.
+ */
+STATIC int
+xfs_mount_validate_sb(
+ xfs_mount_t *mp,
+ xfs_sb_t *sbp)
+{
+ /*
+ * If the log device and data device have the
+ * same device number, the log is internal.
+ * Consequently, the sb_logstart should be non-zero. If
+ * we have a zero sb_logstart in this case, we may be trying to mount
+ * a volume filesystem in a non-volume manner.
+ */
+ if (sbp->sb_magicnum != XFS_SB_MAGIC) {
+ cmn_err(CE_WARN, "XFS: bad magic number");
+ return XFS_ERROR(EWRONGFS);
+ }
+
+ if (!XFS_SB_GOOD_VERSION(sbp)) {
+ cmn_err(CE_WARN, "XFS: bad version");
+ return XFS_ERROR(EWRONGFS);
+ }
+
+ if (unlikely(
+ sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) {
+ cmn_err(CE_WARN,
+ "XFS: filesystem is marked as having an external log; "
+ "specify logdev on the\nmount command line.");
+ XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(1)",
+ XFS_ERRLEVEL_HIGH, mp, sbp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ if (unlikely(
+ sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) {
+ cmn_err(CE_WARN,
+ "XFS: filesystem is marked as having an internal log; "
+ "don't specify logdev on\nthe mount command line.");
+ XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(2)",
+ XFS_ERRLEVEL_HIGH, mp, sbp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ /*
+ * More sanity checking. These were stolen directly from
+ * xfs_repair.
+ */
+ if (unlikely(
+ sbp->sb_agcount <= 0 ||
+ sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
+ sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
+ sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
+ sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
+ sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
+ sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
+ sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
+ sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
+ sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
+ sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
+ (sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
+ (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
+ sbp->sb_imax_pct > 100)) {
+ cmn_err(CE_WARN, "XFS: SB sanity check 1 failed");
+ XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(3)",
+ XFS_ERRLEVEL_LOW, mp, sbp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ /*
+ * Sanity check AG count, size fields against data size field
+ */
+ if (unlikely(
+ sbp->sb_dblocks == 0 ||
+ sbp->sb_dblocks >
+ (xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
+ sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
+ sbp->sb_agblocks + XFS_MIN_AG_BLOCKS)) {
+ cmn_err(CE_WARN, "XFS: SB sanity check 2 failed");
+ XFS_ERROR_REPORT("xfs_mount_validate_sb(4)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
+ ASSERT(sbp->sb_blocklog >= BBSHIFT);
+
+#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
+ if (unlikely(
+ (sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
+ (sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
+#else /* Limited by UINT_MAX of sectors */
+ if (unlikely(
+ (sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
+ (sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
+#endif
+ cmn_err(CE_WARN,
+ "XFS: File system is too large to be mounted on this system.");
+ return XFS_ERROR(E2BIG);
+ }
+
+ if (unlikely(sbp->sb_inprogress)) {
+ cmn_err(CE_WARN, "XFS: file system busy");
+ XFS_ERROR_REPORT("xfs_mount_validate_sb(5)",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ /*
+ * Until this is fixed only page-sized or smaller data blocks work.
+ */
+ if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
+ cmn_err(CE_WARN,
+ "XFS: Attempted to mount file system with blocksize %d bytes",
+ sbp->sb_blocksize);
+ cmn_err(CE_WARN,
+ "XFS: Only page-sized (%d) or less blocksizes currently work.",
+ PAGE_SIZE);
+ return XFS_ERROR(ENOSYS);
+ }
+
+ return 0;
+}
+
+xfs_agnumber_t
+xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
+{
+ xfs_agnumber_t index, max_metadata;
+ xfs_perag_t *pag;
+ xfs_agino_t agino;
+ xfs_ino_t ino;
+ xfs_sb_t *sbp = &mp->m_sb;
+ xfs_ino_t max_inum = XFS_MAXINUMBER_32;
+
+ /* Check to see if the filesystem can overflow 32 bit inodes */
+ agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
+ ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
+
+ /* Clear the mount flag if no inode can overflow 32 bits
+ * on this filesystem, or if specifically requested..
+ */
+ if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
+ mp->m_flags |= XFS_MOUNT_32BITINODES;
+ } else {
+ mp->m_flags &= ~XFS_MOUNT_32BITINODES;
+ }
+
+ /* If we can overflow then setup the ag headers accordingly */
+ if (mp->m_flags & XFS_MOUNT_32BITINODES) {
+ /* Calculate how much should be reserved for inodes to
+ * meet the max inode percentage.
+ */
+ if (mp->m_maxicount) {
+ __uint64_t icount;
+
+ icount = sbp->sb_dblocks * sbp->sb_imax_pct;
+ do_div(icount, 100);
+ icount += sbp->sb_agblocks - 1;
+ do_div(icount, mp->m_ialloc_blks);
+ max_metadata = icount;
+ } else {
+ max_metadata = agcount;
+ }
+ for (index = 0; index < agcount; index++) {
+ ino = XFS_AGINO_TO_INO(mp, index, agino);
+ if (ino > max_inum) {
+ index++;
+ break;
+ }
+
+ /* This ag is prefered for inodes */
+ pag = &mp->m_perag[index];
+ pag->pagi_inodeok = 1;
+ if (index < max_metadata)
+ pag->pagf_metadata = 1;
+ }
+ } else {
+ /* Setup default behavior for smaller filesystems */
+ for (index = 0; index < agcount; index++) {
+ pag = &mp->m_perag[index];
+ pag->pagi_inodeok = 1;
+ }
+ }
+ return index;
+}
+
+/*
+ * xfs_xlatesb
+ *
+ * data - on disk version of sb
+ * sb - a superblock
+ * dir - conversion direction: <0 - convert sb to buf
+ * >0 - convert buf to sb
+ * fields - which fields to copy (bitmask)
+ */
+void
+xfs_xlatesb(
+ void *data,
+ xfs_sb_t *sb,
+ int dir,
+ __int64_t fields)
+{
+ xfs_caddr_t buf_ptr;
+ xfs_caddr_t mem_ptr;
+ xfs_sb_field_t f;
+ int first;
+ int size;
+
+ ASSERT(dir);
+ ASSERT(fields);
+
+ if (!fields)
+ return;
+
+ buf_ptr = (xfs_caddr_t)data;
+ mem_ptr = (xfs_caddr_t)sb;
+
+ while (fields) {
+ f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
+ first = xfs_sb_info[f].offset;
+ size = xfs_sb_info[f + 1].offset - first;
+
+ ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
+
+ if (size == 1 || xfs_sb_info[f].type == 1) {
+ if (dir > 0) {
+ memcpy(mem_ptr + first, buf_ptr + first, size);
+ } else {
+ memcpy(buf_ptr + first, mem_ptr + first, size);
+ }
+ } else {
+ switch (size) {
+ case 2:
+ INT_XLATE(*(__uint16_t*)(buf_ptr+first),
+ *(__uint16_t*)(mem_ptr+first),
+ dir, ARCH_CONVERT);
+ break;
+ case 4:
+ INT_XLATE(*(__uint32_t*)(buf_ptr+first),
+ *(__uint32_t*)(mem_ptr+first),
+ dir, ARCH_CONVERT);
+ break;
+ case 8:
+ INT_XLATE(*(__uint64_t*)(buf_ptr+first),
+ *(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
+ break;
+ default:
+ ASSERT(0);
+ }
+ }
+
+ fields &= ~(1LL << f);
+ }
+}
+
+/*
+ * xfs_readsb
+ *
+ * Does the initial read of the superblock.
+ */
+int
+xfs_readsb(xfs_mount_t *mp)
+{
+ unsigned int sector_size;
+ unsigned int extra_flags;
+ xfs_buf_t *bp;
+ xfs_sb_t *sbp;
+ int error;
+
+ ASSERT(mp->m_sb_bp == NULL);
+ ASSERT(mp->m_ddev_targp != NULL);
+
+ /*
+ * Allocate a (locked) buffer to hold the superblock.
+ * This will be kept around at all times to optimize
+ * access to the superblock.
+ */
+ sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
+ extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
+
+ bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
+ BTOBB(sector_size), extra_flags);
+ if (!bp || XFS_BUF_ISERROR(bp)) {
+ cmn_err(CE_WARN, "XFS: SB read failed");
+ error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
+ goto fail;
+ }
+ ASSERT(XFS_BUF_ISBUSY(bp));
+ ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
+
+ /*
+ * Initialize the mount structure from the superblock.
+ * But first do some basic consistency checking.
+ */
+ sbp = XFS_BUF_TO_SBP(bp);
+ xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, XFS_SB_ALL_BITS);
+
+ error = xfs_mount_validate_sb(mp, &(mp->m_sb));
+ if (error) {
+ cmn_err(CE_WARN, "XFS: SB validate failed");
+ goto fail;
+ }
+
+ /*
+ * We must be able to do sector-sized and sector-aligned IO.
+ */
+ if (sector_size > mp->m_sb.sb_sectsize) {
+ cmn_err(CE_WARN,
+ "XFS: device supports only %u byte sectors (not %u)",
+ sector_size, mp->m_sb.sb_sectsize);
+ error = ENOSYS;
+ goto fail;
+ }
+
+ /*
+ * If device sector size is smaller than the superblock size,
+ * re-read the superblock so the buffer is correctly sized.
+ */
+ if (sector_size < mp->m_sb.sb_sectsize) {
+ XFS_BUF_UNMANAGE(bp);
+ xfs_buf_relse(bp);
+ sector_size = mp->m_sb.sb_sectsize;
+ bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
+ BTOBB(sector_size), extra_flags);
+ if (!bp || XFS_BUF_ISERROR(bp)) {
+ cmn_err(CE_WARN, "XFS: SB re-read failed");
+ error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
+ goto fail;
+ }
+ ASSERT(XFS_BUF_ISBUSY(bp));
+ ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
+ }
+
+ mp->m_sb_bp = bp;
+ xfs_buf_relse(bp);
+ ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
+ return 0;
+
+ fail:
+ if (bp) {
+ XFS_BUF_UNMANAGE(bp);
+ xfs_buf_relse(bp);
+ }
+ return error;
+}
+
+
+/*
+ * xfs_mount_common
+ *
+ * Mount initialization code establishing various mount
+ * fields from the superblock associated with the given
+ * mount structure
+ */
+void
+xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
+{
+ int i;
+
+ mp->m_agfrotor = mp->m_agirotor = 0;
+ spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
+ mp->m_maxagi = mp->m_sb.sb_agcount;
+ mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
+ mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
+ mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT;
+ mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
+ mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
+ mp->m_litino = sbp->sb_inodesize -
+ ((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
+ mp->m_blockmask = sbp->sb_blocksize - 1;
+ mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
+ mp->m_blockwmask = mp->m_blockwsize - 1;
+ INIT_LIST_HEAD(&mp->m_del_inodes);
+
+ /*
+ * Setup for attributes, in case they get created.
+ * This value is for inodes getting attributes for the first time,
+ * the per-inode value is for old attribute values.
+ */
+ ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
+ switch (sbp->sb_inodesize) {
+ case 256:
+ mp->m_attroffset = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(2);
+ break;
+ case 512:
+ case 1024:
+ case 2048:
+ mp->m_attroffset = XFS_BMDR_SPACE_CALC(12);
+ break;
+ default:
+ ASSERT(0);
+ }
+ ASSERT(mp->m_attroffset < XFS_LITINO(mp));
+
+ for (i = 0; i < 2; i++) {
+ mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
+ xfs_alloc, i == 0);
+ mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
+ xfs_alloc, i == 0);
+ }
+ for (i = 0; i < 2; i++) {
+ mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
+ xfs_bmbt, i == 0);
+ mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
+ xfs_bmbt, i == 0);
+ }
+ for (i = 0; i < 2; i++) {
+ mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
+ xfs_inobt, i == 0);
+ mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
+ xfs_inobt, i == 0);
+ }
+
+ mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
+ mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
+ sbp->sb_inopblock);
+ mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
+}
+/*
+ * xfs_mountfs
+ *
+ * This function does the following on an initial mount of a file system:
+ * - reads the superblock from disk and init the mount struct
+ * - if we're a 32-bit kernel, do a size check on the superblock
+ * so we don't mount terabyte filesystems
+ * - init mount struct realtime fields
+ * - allocate inode hash table for fs
+ * - init directory manager
+ * - perform recovery and init the log manager
+ */
+int
+xfs_mountfs(
+ vfs_t *vfsp,
+ xfs_mount_t *mp,
+ int mfsi_flags)
+{
+ xfs_buf_t *bp;
+ xfs_sb_t *sbp = &(mp->m_sb);
+ xfs_inode_t *rip;
+ vnode_t *rvp = NULL;
+ int readio_log, writeio_log;
+ xfs_daddr_t d;
+ __uint64_t ret64;
+ __int64_t update_flags;
+ uint quotamount, quotaflags;
+ int agno;
+ int uuid_mounted = 0;
+ int error = 0;
+
+ if (mp->m_sb_bp == NULL) {
+ if ((error = xfs_readsb(mp))) {
+ return (error);
+ }
+ }
+ xfs_mount_common(mp, sbp);
+
+ /*
+ * Check if sb_agblocks is aligned at stripe boundary
+ * If sb_agblocks is NOT aligned turn off m_dalign since
+ * allocator alignment is within an ag, therefore ag has
+ * to be aligned at stripe boundary.
+ */
+ update_flags = 0LL;
+ if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
+ /*
+ * If stripe unit and stripe width are not multiples
+ * of the fs blocksize turn off alignment.
+ */
+ if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
+ (BBTOB(mp->m_swidth) & mp->m_blockmask)) {
+ if (mp->m_flags & XFS_MOUNT_RETERR) {
+ cmn_err(CE_WARN,
+ "XFS: alignment check 1 failed");
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+ mp->m_dalign = mp->m_swidth = 0;
+ } else {
+ /*
+ * Convert the stripe unit and width to FSBs.
+ */
+ mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
+ if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
+ if (mp->m_flags & XFS_MOUNT_RETERR) {
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+ xfs_fs_cmn_err(CE_WARN, mp,
+"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
+ mp->m_dalign, mp->m_swidth,
+ sbp->sb_agblocks);
+
+ mp->m_dalign = 0;
+ mp->m_swidth = 0;
+ } else if (mp->m_dalign) {
+ mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
+ } else {
+ if (mp->m_flags & XFS_MOUNT_RETERR) {
+ xfs_fs_cmn_err(CE_WARN, mp,
+"stripe alignment turned off: sunit(%d) less than bsize(%d)",
+ mp->m_dalign,
+ mp->m_blockmask +1);
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+ mp->m_swidth = 0;
+ }
+ }
+
+ /*
+ * Update superblock with new values
+ * and log changes
+ */
+ if (XFS_SB_VERSION_HASDALIGN(sbp)) {
+ if (sbp->sb_unit != mp->m_dalign) {
+ sbp->sb_unit = mp->m_dalign;
+ update_flags |= XFS_SB_UNIT;
+ }
+ if (sbp->sb_width != mp->m_swidth) {
+ sbp->sb_width = mp->m_swidth;
+ update_flags |= XFS_SB_WIDTH;
+ }
+ }
+ } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
+ XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
+ mp->m_dalign = sbp->sb_unit;
+ mp->m_swidth = sbp->sb_width;
+ }
+
+ xfs_alloc_compute_maxlevels(mp);
+ xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
+ xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
+ xfs_ialloc_compute_maxlevels(mp);
+
+ if (sbp->sb_imax_pct) {
+ __uint64_t icount;
+
+ /* Make sure the maximum inode count is a multiple of the
+ * units we allocate inodes in.
+ */
+
+ icount = sbp->sb_dblocks * sbp->sb_imax_pct;
+ do_div(icount, 100);
+ do_div(icount, mp->m_ialloc_blks);
+ mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
+ sbp->sb_inopblog;
+ } else
+ mp->m_maxicount = 0;
+
+ mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
+
+ /*
+ * XFS uses the uuid from the superblock as the unique
+ * identifier for fsid. We can not use the uuid from the volume
+ * since a single partition filesystem is identical to a single
+ * partition volume/filesystem.
+ */
+ if ((mfsi_flags & XFS_MFSI_SECOND) == 0 &&
+ (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
+ if (xfs_uuid_mount(mp)) {
+ error = XFS_ERROR(EINVAL);
+ goto error1;
+ }
+ uuid_mounted=1;
+ ret64 = uuid_hash64(&sbp->sb_uuid);
+ memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
+ }
+
+ /*
+ * Set the default minimum read and write sizes unless
+ * already specified in a mount option.
+ * We use smaller I/O sizes when the file system
+ * is being used for NFS service (wsync mount option).
+ */
+ if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
+ if (mp->m_flags & XFS_MOUNT_WSYNC) {
+ readio_log = XFS_WSYNC_READIO_LOG;
+ writeio_log = XFS_WSYNC_WRITEIO_LOG;
+ } else {
+ readio_log = XFS_READIO_LOG_LARGE;
+ writeio_log = XFS_WRITEIO_LOG_LARGE;
+ }
+ } else {
+ readio_log = mp->m_readio_log;
+ writeio_log = mp->m_writeio_log;
+ }
+
+ /*
+ * Set the number of readahead buffers to use based on
+ * physical memory size.
+ */
+ if (xfs_physmem <= 4096) /* <= 16MB */
+ mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
+ else if (xfs_physmem <= 8192) /* <= 32MB */
+ mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
+ else
+ mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
+ if (sbp->sb_blocklog > readio_log) {
+ mp->m_readio_log = sbp->sb_blocklog;
+ } else {
+ mp->m_readio_log = readio_log;
+ }
+ mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
+ if (sbp->sb_blocklog > writeio_log) {
+ mp->m_writeio_log = sbp->sb_blocklog;
+ } else {
+ mp->m_writeio_log = writeio_log;
+ }
+ mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
+
+ /*
+ * Set the inode cluster size based on the physical memory
+ * size. This may still be overridden by the file system
+ * block size if it is larger than the chosen cluster size.
+ */
+ if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
+ mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
+ } else {
+ mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
+ }
+ /*
+ * Set whether we're using inode alignment.
+ */
+ if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
+ mp->m_sb.sb_inoalignmt >=
+ XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
+ mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
+ else
+ mp->m_inoalign_mask = 0;
+ /*
+ * If we are using stripe alignment, check whether
+ * the stripe unit is a multiple of the inode alignment
+ */
+ if (mp->m_dalign && mp->m_inoalign_mask &&
+ !(mp->m_dalign & mp->m_inoalign_mask))
+ mp->m_sinoalign = mp->m_dalign;
+ else
+ mp->m_sinoalign = 0;
+ /*
+ * Check that the data (and log if separate) are an ok size.
+ */
+ d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
+ if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
+ cmn_err(CE_WARN, "XFS: size check 1 failed");
+ error = XFS_ERROR(E2BIG);
+ goto error1;
+ }
+ error = xfs_read_buf(mp, mp->m_ddev_targp,
+ d - XFS_FSS_TO_BB(mp, 1),
+ XFS_FSS_TO_BB(mp, 1), 0, &bp);
+ if (!error) {
+ xfs_buf_relse(bp);
+ } else {
+ cmn_err(CE_WARN, "XFS: size check 2 failed");
+ if (error == ENOSPC) {
+ error = XFS_ERROR(E2BIG);
+ }
+ goto error1;
+ }
+
+ if (((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
+ mp->m_logdev_targp != mp->m_ddev_targp) {
+ d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
+ if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
+ cmn_err(CE_WARN, "XFS: size check 3 failed");
+ error = XFS_ERROR(E2BIG);
+ goto error1;
+ }
+ error = xfs_read_buf(mp, mp->m_logdev_targp,
+ d - XFS_FSB_TO_BB(mp, 1),
+ XFS_FSB_TO_BB(mp, 1), 0, &bp);
+ if (!error) {
+ xfs_buf_relse(bp);
+ } else {
+ cmn_err(CE_WARN, "XFS: size check 3 failed");
+ if (error == ENOSPC) {
+ error = XFS_ERROR(E2BIG);
+ }
+ goto error1;
+ }
+ }
+
+ /*
+ * Initialize realtime fields in the mount structure
+ */
+ if ((error = xfs_rtmount_init(mp))) {
+ cmn_err(CE_WARN, "XFS: RT mount failed");
+ goto error1;
+ }
+
+ /*
+ * For client case we are done now
+ */
+ if (mfsi_flags & XFS_MFSI_CLIENT) {
+ return(0);
+ }
+
+ /*
+ * Copies the low order bits of the timestamp and the randomly
+ * set "sequence" number out of a UUID.
+ */
+ uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
+
+ /*
+ * The vfs structure needs to have a file system independent
+ * way of checking for the invariant file system ID. Since it
+ * can't look at mount structures it has a pointer to the data
+ * in the mount structure.
+ *
+ * File systems that don't support user level file handles (i.e.
+ * all of them except for XFS) will leave vfs_altfsid as NULL.
+ */
+ vfsp->vfs_altfsid = (xfs_fsid_t *)mp->m_fixedfsid;
+ mp->m_dmevmask = 0; /* not persistent; set after each mount */
+
+ /*
+ * Select the right directory manager.
+ */
+ mp->m_dirops =
+ XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
+ xfsv2_dirops :
+ xfsv1_dirops;
+
+ /*
+ * Initialize directory manager's entries.
+ */
+ XFS_DIR_MOUNT(mp);
+
+ /*
+ * Initialize the attribute manager's entries.
+ */
+ mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
+
+ /*
+ * Initialize the precomputed transaction reservations values.
+ */
+ xfs_trans_init(mp);
+
+ /*
+ * Allocate and initialize the inode hash table for this
+ * file system.
+ */
+ xfs_ihash_init(mp);
+ xfs_chash_init(mp);
+
+ /*
+ * Allocate and initialize the per-ag data.
+ */
+ init_rwsem(&mp->m_peraglock);
+ mp->m_perag =
+ kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
+
+ mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
+
+ /*
+ * log's mount-time initialization. Perform 1st part recovery if needed
+ */
+ if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
+ error = xfs_log_mount(mp, mp->m_logdev_targp,
+ XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
+ XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
+ if (error) {
+ cmn_err(CE_WARN, "XFS: log mount failed");
+ goto error2;
+ }
+ } else { /* No log has been defined */
+ cmn_err(CE_WARN, "XFS: no log defined");
+ XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto error2;
+ }
+
+ /*
+ * Get and sanity-check the root inode.
+ * Save the pointer to it in the mount structure.
+ */
+ error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip, 0);
+ if (error) {
+ cmn_err(CE_WARN, "XFS: failed to read root inode");
+ goto error3;
+ }
+
+ ASSERT(rip != NULL);
+ rvp = XFS_ITOV(rip);
+
+ if (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
+ cmn_err(CE_WARN, "XFS: corrupted root inode");
+ prdev("Root inode %llu is not a directory",
+ mp->m_ddev_targp, (unsigned long long)rip->i_ino);
+ xfs_iunlock(rip, XFS_ILOCK_EXCL);
+ XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
+ mp);
+ error = XFS_ERROR(EFSCORRUPTED);
+ goto error4;
+ }
+ mp->m_rootip = rip; /* save it */
+
+ xfs_iunlock(rip, XFS_ILOCK_EXCL);
+
+ /*
+ * Initialize realtime inode pointers in the mount structure
+ */
+ if ((error = xfs_rtmount_inodes(mp))) {
+ /*
+ * Free up the root inode.
+ */
+ cmn_err(CE_WARN, "XFS: failed to read RT inodes");
+ goto error4;
+ }
+
+ /*
+ * If fs is not mounted readonly, then update the superblock
+ * unit and width changes.
+ */
+ if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
+ xfs_mount_log_sbunit(mp, update_flags);
+
+ /*
+ * Initialise the XFS quota management subsystem for this mount
+ */
+ if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
+ goto error4;
+
+ /*
+ * Finish recovering the file system. This part needed to be
+ * delayed until after the root and real-time bitmap inodes
+ * were consistently read in.
+ */
+ error = xfs_log_mount_finish(mp, mfsi_flags);
+ if (error) {
+ cmn_err(CE_WARN, "XFS: log mount finish failed");
+ goto error4;
+ }
+
+ /*
+ * Complete the quota initialisation, post-log-replay component.
+ */
+ if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
+ goto error4;
+
+ return 0;
+
+ error4:
+ /*
+ * Free up the root inode.
+ */
+ VN_RELE(rvp);
+ error3:
+ xfs_log_unmount_dealloc(mp);
+ error2:
+ xfs_ihash_free(mp);
+ xfs_chash_free(mp);
+ for (agno = 0; agno < sbp->sb_agcount; agno++)
+ if (mp->m_perag[agno].pagb_list)
+ kmem_free(mp->m_perag[agno].pagb_list,
+ sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
+ kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
+ mp->m_perag = NULL;
+ /* FALLTHROUGH */
+ error1:
+ if (uuid_mounted)
+ xfs_uuid_unmount(mp);
+ xfs_freesb(mp);
+ return error;
+}
+
+/*
+ * xfs_unmountfs
+ *
+ * This flushes out the inodes,dquots and the superblock, unmounts the
+ * log and makes sure that incore structures are freed.
+ */
+int
+xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
+{
+ struct vfs *vfsp = XFS_MTOVFS(mp);
+#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
+ int64_t fsid;
+#endif
+
+ xfs_iflush_all(mp, XFS_FLUSH_ALL);
+
+ XFS_QM_DQPURGEALL(mp,
+ XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);
+
+ /*
+ * Flush out the log synchronously so that we know for sure
+ * that nothing is pinned. This is important because bflush()
+ * will skip pinned buffers.
+ */
+ xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
+
+ xfs_binval(mp->m_ddev_targp);
+ if (mp->m_rtdev_targp) {
+ xfs_binval(mp->m_rtdev_targp);
+ }
+
+ xfs_unmountfs_writesb(mp);
+
+ xfs_unmountfs_wait(mp); /* wait for async bufs */
+
+ xfs_log_unmount(mp); /* Done! No more fs ops. */
+
+ xfs_freesb(mp);
+
+ /*
+ * All inodes from this mount point should be freed.
+ */
+ ASSERT(mp->m_inodes == NULL);
+
+ /*
+ * We may have bufs that are in the process of getting written still.
+ * We must wait for the I/O completion of those. The sync flag here
+ * does a two pass iteration thru the bufcache.
+ */
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_incore_relse(mp->m_ddev_targp, 0, 1); /* synchronous */
+ }
+
+ xfs_unmountfs_close(mp, cr);
+ if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
+ xfs_uuid_unmount(mp);
+
+#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
+ /*
+ * clear all error tags on this filesystem
+ */
+ memcpy(&fsid, &vfsp->vfs_fsid, sizeof(int64_t));
+ xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
+#endif
+ XFS_IODONE(vfsp);
+ xfs_mount_free(mp, 1);
+ return 0;
+}
+
+void
+xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
+{
+ if (mp->m_logdev_targp != mp->m_ddev_targp)
+ xfs_free_buftarg(mp->m_logdev_targp, 1);
+ if (mp->m_rtdev_targp)
+ xfs_free_buftarg(mp->m_rtdev_targp, 1);
+ xfs_free_buftarg(mp->m_ddev_targp, 0);
+}
+
+void
+xfs_unmountfs_wait(xfs_mount_t *mp)
+{
+ if (mp->m_logdev_targp != mp->m_ddev_targp)
+ xfs_wait_buftarg(mp->m_logdev_targp);
+ if (mp->m_rtdev_targp)
+ xfs_wait_buftarg(mp->m_rtdev_targp);
+ xfs_wait_buftarg(mp->m_ddev_targp);
+}
+
+int
+xfs_unmountfs_writesb(xfs_mount_t *mp)
+{
+ xfs_buf_t *sbp;
+ xfs_sb_t *sb;
+ int error = 0;
+
+ /*
+ * skip superblock write if fs is read-only, or
+ * if we are doing a forced umount.
+ */
+ sbp = xfs_getsb(mp, 0);
+ if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
+ XFS_FORCED_SHUTDOWN(mp))) {
+ /*
+ * mark shared-readonly if desired
+ */
+ sb = XFS_BUF_TO_SBP(sbp);
+ if (mp->m_mk_sharedro) {
+ if (!(sb->sb_flags & XFS_SBF_READONLY))
+ sb->sb_flags |= XFS_SBF_READONLY;
+ if (!XFS_SB_VERSION_HASSHARED(sb))
+ XFS_SB_VERSION_ADDSHARED(sb);
+ xfs_fs_cmn_err(CE_NOTE, mp,
+ "Unmounting, marking shared read-only");
+ }
+ XFS_BUF_UNDONE(sbp);
+ XFS_BUF_UNREAD(sbp);
+ XFS_BUF_UNDELAYWRITE(sbp);
+ XFS_BUF_WRITE(sbp);
+ XFS_BUF_UNASYNC(sbp);
+ ASSERT(XFS_BUF_TARGET(sbp) == mp->m_ddev_targp);
+ xfsbdstrat(mp, sbp);
+ /* Nevermind errors we might get here. */
+ error = xfs_iowait(sbp);
+ if (error)
+ xfs_ioerror_alert("xfs_unmountfs_writesb",
+ mp, sbp, XFS_BUF_ADDR(sbp));
+ if (error && mp->m_mk_sharedro)
+ xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
+ }
+ xfs_buf_relse(sbp);
+ return (error);
+}
+
+/*
+ * xfs_mod_sb() can be used to copy arbitrary changes to the
+ * in-core superblock into the superblock buffer to be logged.
+ * It does not provide the higher level of locking that is
+ * needed to protect the in-core superblock from concurrent
+ * access.
+ */
+void
+xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
+{
+ xfs_buf_t *bp;
+ int first;
+ int last;
+ xfs_mount_t *mp;
+ xfs_sb_t *sbp;
+ xfs_sb_field_t f;
+
+ ASSERT(fields);
+ if (!fields)
+ return;
+ mp = tp->t_mountp;
+ bp = xfs_trans_getsb(tp, mp, 0);
+ sbp = XFS_BUF_TO_SBP(bp);
+ first = sizeof(xfs_sb_t);
+ last = 0;
+
+ /* translate/copy */
+
+ xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, fields);
+
+ /* find modified range */
+
+ f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
+ ASSERT((1LL << f) & XFS_SB_MOD_BITS);
+ first = xfs_sb_info[f].offset;
+
+ f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
+ ASSERT((1LL << f) & XFS_SB_MOD_BITS);
+ last = xfs_sb_info[f + 1].offset - 1;
+
+ xfs_trans_log_buf(tp, bp, first, last);
+}
+
+/*
+ * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
+ * a delta to a specified field in the in-core superblock. Simply
+ * switch on the field indicated and apply the delta to that field.
+ * Fields are not allowed to dip below zero, so if the delta would
+ * do this do not apply it and return EINVAL.
+ *
+ * The SB_LOCK must be held when this routine is called.
+ */
+STATIC int
+xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
+ int delta, int rsvd)
+{
+ int scounter; /* short counter for 32 bit fields */
+ long long lcounter; /* long counter for 64 bit fields */
+ long long res_used, rem;
+
+ /*
+ * With the in-core superblock spin lock held, switch
+ * on the indicated field. Apply the delta to the
+ * proper field. If the fields value would dip below
+ * 0, then do not apply the delta and return EINVAL.
+ */
+ switch (field) {
+ case XFS_SBS_ICOUNT:
+ lcounter = (long long)mp->m_sb.sb_icount;
+ lcounter += delta;
+ if (lcounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_icount = lcounter;
+ return (0);
+ case XFS_SBS_IFREE:
+ lcounter = (long long)mp->m_sb.sb_ifree;
+ lcounter += delta;
+ if (lcounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_ifree = lcounter;
+ return (0);
+ case XFS_SBS_FDBLOCKS:
+
+ lcounter = (long long)mp->m_sb.sb_fdblocks;
+ res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
+
+ if (delta > 0) { /* Putting blocks back */
+ if (res_used > delta) {
+ mp->m_resblks_avail += delta;
+ } else {
+ rem = delta - res_used;
+ mp->m_resblks_avail = mp->m_resblks;
+ lcounter += rem;
+ }
+ } else { /* Taking blocks away */
+
+ lcounter += delta;
+
+ /*
+ * If were out of blocks, use any available reserved blocks if
+ * were allowed to.
+ */
+
+ if (lcounter < 0) {
+ if (rsvd) {
+ lcounter = (long long)mp->m_resblks_avail + delta;
+ if (lcounter < 0) {
+ return (XFS_ERROR(ENOSPC));
+ }
+ mp->m_resblks_avail = lcounter;
+ return (0);
+ } else { /* not reserved */
+ return (XFS_ERROR(ENOSPC));
+ }
+ }
+ }
+
+ mp->m_sb.sb_fdblocks = lcounter;
+ return (0);
+ case XFS_SBS_FREXTENTS:
+ lcounter = (long long)mp->m_sb.sb_frextents;
+ lcounter += delta;
+ if (lcounter < 0) {
+ return (XFS_ERROR(ENOSPC));
+ }
+ mp->m_sb.sb_frextents = lcounter;
+ return (0);
+ case XFS_SBS_DBLOCKS:
+ lcounter = (long long)mp->m_sb.sb_dblocks;
+ lcounter += delta;
+ if (lcounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_dblocks = lcounter;
+ return (0);
+ case XFS_SBS_AGCOUNT:
+ scounter = mp->m_sb.sb_agcount;
+ scounter += delta;
+ if (scounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_agcount = scounter;
+ return (0);
+ case XFS_SBS_IMAX_PCT:
+ scounter = mp->m_sb.sb_imax_pct;
+ scounter += delta;
+ if (scounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_imax_pct = scounter;
+ return (0);
+ case XFS_SBS_REXTSIZE:
+ scounter = mp->m_sb.sb_rextsize;
+ scounter += delta;
+ if (scounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_rextsize = scounter;
+ return (0);
+ case XFS_SBS_RBMBLOCKS:
+ scounter = mp->m_sb.sb_rbmblocks;
+ scounter += delta;
+ if (scounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_rbmblocks = scounter;
+ return (0);
+ case XFS_SBS_RBLOCKS:
+ lcounter = (long long)mp->m_sb.sb_rblocks;
+ lcounter += delta;
+ if (lcounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_rblocks = lcounter;
+ return (0);
+ case XFS_SBS_REXTENTS:
+ lcounter = (long long)mp->m_sb.sb_rextents;
+ lcounter += delta;
+ if (lcounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_rextents = lcounter;
+ return (0);
+ case XFS_SBS_REXTSLOG:
+ scounter = mp->m_sb.sb_rextslog;
+ scounter += delta;
+ if (scounter < 0) {
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+ mp->m_sb.sb_rextslog = scounter;
+ return (0);
+ default:
+ ASSERT(0);
+ return (XFS_ERROR(EINVAL));
+ }
+}
+
+/*
+ * xfs_mod_incore_sb() is used to change a field in the in-core
+ * superblock structure by the specified delta. This modification
+ * is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
+ * routine to do the work.
+ */
+int
+xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
+{
+ unsigned long s;
+ int status;
+
+ s = XFS_SB_LOCK(mp);
+ status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
+ XFS_SB_UNLOCK(mp, s);
+ return (status);
+}
+
+/*
+ * xfs_mod_incore_sb_batch() is used to change more than one field
+ * in the in-core superblock structure at a time. This modification
+ * is protected by a lock internal to this module. The fields and
+ * changes to those fields are specified in the array of xfs_mod_sb
+ * structures passed in.
+ *
+ * Either all of the specified deltas will be applied or none of
+ * them will. If any modified field dips below 0, then all modifications
+ * will be backed out and EINVAL will be returned.
+ */
+int
+xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
+{
+ unsigned long s;
+ int status=0;
+ xfs_mod_sb_t *msbp;
+
+ /*
+ * Loop through the array of mod structures and apply each
+ * individually. If any fail, then back out all those
+ * which have already been applied. Do all of this within
+ * the scope of the SB_LOCK so that all of the changes will
+ * be atomic.
+ */
+ s = XFS_SB_LOCK(mp);
+ msbp = &msb[0];
+ for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
+ /*
+ * Apply the delta at index n. If it fails, break
+ * from the loop so we'll fall into the undo loop
+ * below.
+ */
+ status = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
+ msbp->msb_delta, rsvd);
+ if (status != 0) {
+ break;
+ }
+ }
+
+ /*
+ * If we didn't complete the loop above, then back out
+ * any changes made to the superblock. If you add code
+ * between the loop above and here, make sure that you
+ * preserve the value of status. Loop back until
+ * we step below the beginning of the array. Make sure
+ * we don't touch anything back there.
+ */
+ if (status != 0) {
+ msbp--;
+ while (msbp >= msb) {
+ status = xfs_mod_incore_sb_unlocked(mp,
+ msbp->msb_field, -(msbp->msb_delta), rsvd);
+ ASSERT(status == 0);
+ msbp--;
+ }
+ }
+ XFS_SB_UNLOCK(mp, s);
+ return (status);
+}
+
+/*
+ * xfs_getsb() is called to obtain the buffer for the superblock.
+ * The buffer is returned locked and read in from disk.
+ * The buffer should be released with a call to xfs_brelse().
+ *
+ * If the flags parameter is BUF_TRYLOCK, then we'll only return
+ * the superblock buffer if it can be locked without sleeping.
+ * If it can't then we'll return NULL.
+ */
+xfs_buf_t *
+xfs_getsb(
+ xfs_mount_t *mp,
+ int flags)
+{
+ xfs_buf_t *bp;
+
+ ASSERT(mp->m_sb_bp != NULL);
+ bp = mp->m_sb_bp;
+ if (flags & XFS_BUF_TRYLOCK) {
+ if (!XFS_BUF_CPSEMA(bp)) {
+ return NULL;
+ }
+ } else {
+ XFS_BUF_PSEMA(bp, PRIBIO);
+ }
+ XFS_BUF_HOLD(bp);
+ ASSERT(XFS_BUF_ISDONE(bp));
+ return (bp);
+}
+
+/*
+ * Used to free the superblock along various error paths.
+ */
+void
+xfs_freesb(
+ xfs_mount_t *mp)
+{
+ xfs_buf_t *bp;
+
+ /*
+ * Use xfs_getsb() so that the buffer will be locked
+ * when we call xfs_buf_relse().
+ */
+ bp = xfs_getsb(mp, 0);
+ XFS_BUF_UNMANAGE(bp);
+ xfs_buf_relse(bp);
+ mp->m_sb_bp = NULL;
+}
+
+/*
+ * See if the UUID is unique among mounted XFS filesystems.
+ * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
+ */
+STATIC int
+xfs_uuid_mount(
+ xfs_mount_t *mp)
+{
+ if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
+ cmn_err(CE_WARN,
+ "XFS: Filesystem %s has nil UUID - can't mount",
+ mp->m_fsname);
+ return -1;
+ }
+ if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
+ cmn_err(CE_WARN,
+ "XFS: Filesystem %s has duplicate UUID - can't mount",
+ mp->m_fsname);
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * Remove filesystem from the UUID table.
+ */
+STATIC void
+xfs_uuid_unmount(
+ xfs_mount_t *mp)
+{
+ uuid_table_remove(&mp->m_sb.sb_uuid);
+}
+
+/*
+ * Used to log changes to the superblock unit and width fields which could
+ * be altered by the mount options. Only the first superblock is updated.
+ */
+STATIC void
+xfs_mount_log_sbunit(
+ xfs_mount_t *mp,
+ __int64_t fields)
+{
+ xfs_trans_t *tp;
+
+ ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
+ if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
+ XFS_DEFAULT_LOG_COUNT)) {
+ xfs_trans_cancel(tp, 0);
+ return;
+ }
+ xfs_mod_sb(tp, fields);
+ xfs_trans_commit(tp, 0, NULL);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 08:40:53 +0000