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-rw-r--r--fs/xfs/xfs_super.c1773
1 files changed, 1773 insertions, 0 deletions
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
new file mode 100644
index 000000000000..9a72dda58bd0
--- /dev/null
+++ b/fs/xfs/xfs_super.c
@@ -0,0 +1,1773 @@
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "xfs.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir2.h"
+#include "xfs_alloc.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_itable.h"
+#include "xfs_fsops.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_utils.h"
+#include "xfs_vnodeops.h"
+#include "xfs_log_priv.h"
+#include "xfs_trans_priv.h"
+#include "xfs_filestream.h"
+#include "xfs_da_btree.h"
+#include "xfs_extfree_item.h"
+#include "xfs_mru_cache.h"
+#include "xfs_inode_item.h"
+#include "xfs_sync.h"
+#include "xfs_trace.h"
+
+#include <linux/namei.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/mount.h>
+#include <linux/mempool.h>
+#include <linux/writeback.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/parser.h>
+
+static const struct super_operations xfs_super_operations;
+static kmem_zone_t *xfs_ioend_zone;
+mempool_t *xfs_ioend_pool;
+
+#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */
+#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */
+#define MNTOPT_LOGDEV "logdev" /* log device */
+#define MNTOPT_RTDEV "rtdev" /* realtime I/O device */
+#define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */
+#define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */
+#define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */
+#define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */
+#define MNTOPT_SUNIT "sunit" /* data volume stripe unit */
+#define MNTOPT_SWIDTH "swidth" /* data volume stripe width */
+#define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */
+#define MNTOPT_MTPT "mtpt" /* filesystem mount point */
+#define MNTOPT_GRPID "grpid" /* group-ID from parent directory */
+#define MNTOPT_NOGRPID "nogrpid" /* group-ID from current process */
+#define MNTOPT_BSDGROUPS "bsdgroups" /* group-ID from parent directory */
+#define MNTOPT_SYSVGROUPS "sysvgroups" /* group-ID from current process */
+#define MNTOPT_ALLOCSIZE "allocsize" /* preferred allocation size */
+#define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */
+#define MNTOPT_BARRIER "barrier" /* use writer barriers for log write and
+ * unwritten extent conversion */
+#define MNTOPT_NOBARRIER "nobarrier" /* .. disable */
+#define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */
+#define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */
+#define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */
+#define MNTOPT_LARGEIO "largeio" /* report large I/O sizes in stat() */
+#define MNTOPT_NOLARGEIO "nolargeio" /* do not report large I/O sizes
+ * in stat(). */
+#define MNTOPT_ATTR2 "attr2" /* do use attr2 attribute format */
+#define MNTOPT_NOATTR2 "noattr2" /* do not use attr2 attribute format */
+#define MNTOPT_FILESTREAM "filestreams" /* use filestreams allocator */
+#define MNTOPT_QUOTA "quota" /* disk quotas (user) */
+#define MNTOPT_NOQUOTA "noquota" /* no quotas */
+#define MNTOPT_USRQUOTA "usrquota" /* user quota enabled */
+#define MNTOPT_GRPQUOTA "grpquota" /* group quota enabled */
+#define MNTOPT_PRJQUOTA "prjquota" /* project quota enabled */
+#define MNTOPT_UQUOTA "uquota" /* user quota (IRIX variant) */
+#define MNTOPT_GQUOTA "gquota" /* group quota (IRIX variant) */
+#define MNTOPT_PQUOTA "pquota" /* project quota (IRIX variant) */
+#define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
+#define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
+#define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
+#define MNTOPT_QUOTANOENF "qnoenforce" /* same as uqnoenforce */
+#define MNTOPT_DELAYLOG "delaylog" /* Delayed logging enabled */
+#define MNTOPT_NODELAYLOG "nodelaylog" /* Delayed logging disabled */
+#define MNTOPT_DISCARD "discard" /* Discard unused blocks */
+#define MNTOPT_NODISCARD "nodiscard" /* Do not discard unused blocks */
+
+/*
+ * Table driven mount option parser.
+ *
+ * Currently only used for remount, but it will be used for mount
+ * in the future, too.
+ */
+enum {
+ Opt_barrier, Opt_nobarrier, Opt_err
+};
+
+static const match_table_t tokens = {
+ {Opt_barrier, "barrier"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_err, NULL}
+};
+
+
+STATIC unsigned long
+suffix_strtoul(char *s, char **endp, unsigned int base)
+{
+ int last, shift_left_factor = 0;
+ char *value = s;
+
+ last = strlen(value) - 1;
+ if (value[last] == 'K' || value[last] == 'k') {
+ shift_left_factor = 10;
+ value[last] = '\0';
+ }
+ if (value[last] == 'M' || value[last] == 'm') {
+ shift_left_factor = 20;
+ value[last] = '\0';
+ }
+ if (value[last] == 'G' || value[last] == 'g') {
+ shift_left_factor = 30;
+ value[last] = '\0';
+ }
+
+ return simple_strtoul((const char *)s, endp, base) << shift_left_factor;
+}
+
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock has _not_ yet been read in.
+ *
+ * Note that this function leaks the various device name allocations on
+ * failure. The caller takes care of them.
+ */
+STATIC int
+xfs_parseargs(
+ struct xfs_mount *mp,
+ char *options)
+{
+ struct super_block *sb = mp->m_super;
+ char *this_char, *value, *eov;
+ int dsunit = 0;
+ int dswidth = 0;
+ int iosize = 0;
+ __uint8_t iosizelog = 0;
+
+ /*
+ * set up the mount name first so all the errors will refer to the
+ * correct device.
+ */
+ mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
+ if (!mp->m_fsname)
+ return ENOMEM;
+ mp->m_fsname_len = strlen(mp->m_fsname) + 1;
+
+ /*
+ * Copy binary VFS mount flags we are interested in.
+ */
+ if (sb->s_flags & MS_RDONLY)
+ mp->m_flags |= XFS_MOUNT_RDONLY;
+ if (sb->s_flags & MS_DIRSYNC)
+ mp->m_flags |= XFS_MOUNT_DIRSYNC;
+ if (sb->s_flags & MS_SYNCHRONOUS)
+ mp->m_flags |= XFS_MOUNT_WSYNC;
+
+ /*
+ * Set some default flags that could be cleared by the mount option
+ * parsing.
+ */
+ mp->m_flags |= XFS_MOUNT_BARRIER;
+ mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
+ mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
+ mp->m_flags |= XFS_MOUNT_DELAYLOG;
+
+ /*
+ * These can be overridden by the mount option parsing.
+ */
+ mp->m_logbufs = -1;
+ mp->m_logbsize = -1;
+
+ if (!options)
+ goto done;
+
+ while ((this_char = strsep(&options, ",")) != NULL) {
+ if (!*this_char)
+ continue;
+ if ((value = strchr(this_char, '=')) != NULL)
+ *value++ = 0;
+
+ if (!strcmp(this_char, MNTOPT_LOGBUFS)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ mp->m_logbufs = simple_strtoul(value, &eov, 10);
+ } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ mp->m_logbsize = suffix_strtoul(value, &eov, 10);
+ } else if (!strcmp(this_char, MNTOPT_LOGDEV)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ mp->m_logname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
+ if (!mp->m_logname)
+ return ENOMEM;
+ } else if (!strcmp(this_char, MNTOPT_MTPT)) {
+ xfs_warn(mp, "%s option not allowed on this system",
+ this_char);
+ return EINVAL;
+ } else if (!strcmp(this_char, MNTOPT_RTDEV)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ mp->m_rtname = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
+ if (!mp->m_rtname)
+ return ENOMEM;
+ } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ iosize = simple_strtoul(value, &eov, 10);
+ iosizelog = ffs(iosize) - 1;
+ } else if (!strcmp(this_char, MNTOPT_ALLOCSIZE)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ iosize = suffix_strtoul(value, &eov, 10);
+ iosizelog = ffs(iosize) - 1;
+ } else if (!strcmp(this_char, MNTOPT_GRPID) ||
+ !strcmp(this_char, MNTOPT_BSDGROUPS)) {
+ mp->m_flags |= XFS_MOUNT_GRPID;
+ } else if (!strcmp(this_char, MNTOPT_NOGRPID) ||
+ !strcmp(this_char, MNTOPT_SYSVGROUPS)) {
+ mp->m_flags &= ~XFS_MOUNT_GRPID;
+ } else if (!strcmp(this_char, MNTOPT_WSYNC)) {
+ mp->m_flags |= XFS_MOUNT_WSYNC;
+ } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
+ mp->m_flags |= XFS_MOUNT_NORECOVERY;
+ } else if (!strcmp(this_char, MNTOPT_NOALIGN)) {
+ mp->m_flags |= XFS_MOUNT_NOALIGN;
+ } else if (!strcmp(this_char, MNTOPT_SWALLOC)) {
+ mp->m_flags |= XFS_MOUNT_SWALLOC;
+ } else if (!strcmp(this_char, MNTOPT_SUNIT)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ dsunit = simple_strtoul(value, &eov, 10);
+ } else if (!strcmp(this_char, MNTOPT_SWIDTH)) {
+ if (!value || !*value) {
+ xfs_warn(mp, "%s option requires an argument",
+ this_char);
+ return EINVAL;
+ }
+ dswidth = simple_strtoul(value, &eov, 10);
+ } else if (!strcmp(this_char, MNTOPT_64BITINODE)) {
+ mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
+#if !XFS_BIG_INUMS
+ xfs_warn(mp, "%s option not allowed on this system",
+ this_char);
+ return EINVAL;
+#endif
+ } else if (!strcmp(this_char, MNTOPT_NOUUID)) {
+ mp->m_flags |= XFS_MOUNT_NOUUID;
+ } else if (!strcmp(this_char, MNTOPT_BARRIER)) {
+ mp->m_flags |= XFS_MOUNT_BARRIER;
+ } else if (!strcmp(this_char, MNTOPT_NOBARRIER)) {
+ mp->m_flags &= ~XFS_MOUNT_BARRIER;
+ } else if (!strcmp(this_char, MNTOPT_IKEEP)) {
+ mp->m_flags |= XFS_MOUNT_IKEEP;
+ } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) {
+ mp->m_flags &= ~XFS_MOUNT_IKEEP;
+ } else if (!strcmp(this_char, MNTOPT_LARGEIO)) {
+ mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
+ } else if (!strcmp(this_char, MNTOPT_NOLARGEIO)) {
+ mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
+ } else if (!strcmp(this_char, MNTOPT_ATTR2)) {
+ mp->m_flags |= XFS_MOUNT_ATTR2;
+ } else if (!strcmp(this_char, MNTOPT_NOATTR2)) {
+ mp->m_flags &= ~XFS_MOUNT_ATTR2;
+ mp->m_flags |= XFS_MOUNT_NOATTR2;
+ } else if (!strcmp(this_char, MNTOPT_FILESTREAM)) {
+ mp->m_flags |= XFS_MOUNT_FILESTREAMS;
+ } else if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
+ mp->m_qflags &= ~(XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
+ XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
+ XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
+ XFS_UQUOTA_ENFD | XFS_OQUOTA_ENFD);
+ } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
+ !strcmp(this_char, MNTOPT_UQUOTA) ||
+ !strcmp(this_char, MNTOPT_USRQUOTA)) {
+ mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
+ XFS_UQUOTA_ENFD);
+ } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
+ !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
+ mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
+ mp->m_qflags &= ~XFS_UQUOTA_ENFD;
+ } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
+ !strcmp(this_char, MNTOPT_PRJQUOTA)) {
+ mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
+ XFS_OQUOTA_ENFD);
+ } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
+ mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
+ mp->m_qflags &= ~XFS_OQUOTA_ENFD;
+ } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
+ !strcmp(this_char, MNTOPT_GRPQUOTA)) {
+ mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
+ XFS_OQUOTA_ENFD);
+ } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
+ mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
+ mp->m_qflags &= ~XFS_OQUOTA_ENFD;
+ } else if (!strcmp(this_char, MNTOPT_DELAYLOG)) {
+ mp->m_flags |= XFS_MOUNT_DELAYLOG;
+ } else if (!strcmp(this_char, MNTOPT_NODELAYLOG)) {
+ mp->m_flags &= ~XFS_MOUNT_DELAYLOG;
+ } else if (!strcmp(this_char, MNTOPT_DISCARD)) {
+ mp->m_flags |= XFS_MOUNT_DISCARD;
+ } else if (!strcmp(this_char, MNTOPT_NODISCARD)) {
+ mp->m_flags &= ~XFS_MOUNT_DISCARD;
+ } else if (!strcmp(this_char, "ihashsize")) {
+ xfs_warn(mp,
+ "ihashsize no longer used, option is deprecated.");
+ } else if (!strcmp(this_char, "osyncisdsync")) {
+ xfs_warn(mp,
+ "osyncisdsync has no effect, option is deprecated.");
+ } else if (!strcmp(this_char, "osyncisosync")) {
+ xfs_warn(mp,
+ "osyncisosync has no effect, option is deprecated.");
+ } else if (!strcmp(this_char, "irixsgid")) {
+ xfs_warn(mp,
+ "irixsgid is now a sysctl(2) variable, option is deprecated.");
+ } else {
+ xfs_warn(mp, "unknown mount option [%s].", this_char);
+ return EINVAL;
+ }
+ }
+
+ /*
+ * no recovery flag requires a read-only mount
+ */
+ if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
+ !(mp->m_flags & XFS_MOUNT_RDONLY)) {
+ xfs_warn(mp, "no-recovery mounts must be read-only.");
+ return EINVAL;
+ }
+
+ if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
+ xfs_warn(mp,
+ "sunit and swidth options incompatible with the noalign option");
+ return EINVAL;
+ }
+
+ if ((mp->m_flags & XFS_MOUNT_DISCARD) &&
+ !(mp->m_flags & XFS_MOUNT_DELAYLOG)) {
+ xfs_warn(mp,
+ "the discard option is incompatible with the nodelaylog option");
+ return EINVAL;
+ }
+
+#ifndef CONFIG_XFS_QUOTA
+ if (XFS_IS_QUOTA_RUNNING(mp)) {
+ xfs_warn(mp, "quota support not available in this kernel.");
+ return EINVAL;
+ }
+#endif
+
+ if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
+ (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
+ xfs_warn(mp, "cannot mount with both project and group quota");
+ return EINVAL;
+ }
+
+ if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
+ xfs_warn(mp, "sunit and swidth must be specified together");
+ return EINVAL;
+ }
+
+ if (dsunit && (dswidth % dsunit != 0)) {
+ xfs_warn(mp,
+ "stripe width (%d) must be a multiple of the stripe unit (%d)",
+ dswidth, dsunit);
+ return EINVAL;
+ }
+
+done:
+ if (!(mp->m_flags & XFS_MOUNT_NOALIGN)) {
+ /*
+ * At this point the superblock has not been read
+ * in, therefore we do not know the block size.
+ * Before the mount call ends we will convert
+ * these to FSBs.
+ */
+ if (dsunit) {
+ mp->m_dalign = dsunit;
+ mp->m_flags |= XFS_MOUNT_RETERR;
+ }
+
+ if (dswidth)
+ mp->m_swidth = dswidth;
+ }
+
+ if (mp->m_logbufs != -1 &&
+ mp->m_logbufs != 0 &&
+ (mp->m_logbufs < XLOG_MIN_ICLOGS ||
+ mp->m_logbufs > XLOG_MAX_ICLOGS)) {
+ xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
+ mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
+ return XFS_ERROR(EINVAL);
+ }
+ if (mp->m_logbsize != -1 &&
+ mp->m_logbsize != 0 &&
+ (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
+ mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
+ !is_power_of_2(mp->m_logbsize))) {
+ xfs_warn(mp,
+ "invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
+ mp->m_logbsize);
+ return XFS_ERROR(EINVAL);
+ }
+
+ if (iosizelog) {
+ if (iosizelog > XFS_MAX_IO_LOG ||
+ iosizelog < XFS_MIN_IO_LOG) {
+ xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
+ iosizelog, XFS_MIN_IO_LOG,
+ XFS_MAX_IO_LOG);
+ return XFS_ERROR(EINVAL);
+ }
+
+ mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
+ mp->m_readio_log = iosizelog;
+ mp->m_writeio_log = iosizelog;
+ }
+
+ return 0;
+}
+
+struct proc_xfs_info {
+ int flag;
+ char *str;
+};
+
+STATIC int
+xfs_showargs(
+ struct xfs_mount *mp,
+ struct seq_file *m)
+{
+ static struct proc_xfs_info xfs_info_set[] = {
+ /* the few simple ones we can get from the mount struct */
+ { XFS_MOUNT_IKEEP, "," MNTOPT_IKEEP },
+ { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC },
+ { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
+ { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
+ { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
+ { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
+ { XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
+ { XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
+ { XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
+ { XFS_MOUNT_DELAYLOG, "," MNTOPT_DELAYLOG },
+ { XFS_MOUNT_DISCARD, "," MNTOPT_DISCARD },
+ { 0, NULL }
+ };
+ static struct proc_xfs_info xfs_info_unset[] = {
+ /* the few simple ones we can get from the mount struct */
+ { XFS_MOUNT_COMPAT_IOSIZE, "," MNTOPT_LARGEIO },
+ { XFS_MOUNT_BARRIER, "," MNTOPT_NOBARRIER },
+ { XFS_MOUNT_SMALL_INUMS, "," MNTOPT_64BITINODE },
+ { 0, NULL }
+ };
+ struct proc_xfs_info *xfs_infop;
+
+ for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
+ if (mp->m_flags & xfs_infop->flag)
+ seq_puts(m, xfs_infop->str);
+ }
+ for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
+ if (!(mp->m_flags & xfs_infop->flag))
+ seq_puts(m, xfs_infop->str);
+ }
+
+ if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
+ seq_printf(m, "," MNTOPT_ALLOCSIZE "=%dk",
+ (int)(1 << mp->m_writeio_log) >> 10);
+
+ if (mp->m_logbufs > 0)
+ seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs);
+ if (mp->m_logbsize > 0)
+ seq_printf(m, "," MNTOPT_LOGBSIZE "=%dk", mp->m_logbsize >> 10);
+
+ if (mp->m_logname)
+ seq_printf(m, "," MNTOPT_LOGDEV "=%s", mp->m_logname);
+ if (mp->m_rtname)
+ seq_printf(m, "," MNTOPT_RTDEV "=%s", mp->m_rtname);
+
+ if (mp->m_dalign > 0)
+ seq_printf(m, "," MNTOPT_SUNIT "=%d",
+ (int)XFS_FSB_TO_BB(mp, mp->m_dalign));
+ if (mp->m_swidth > 0)
+ seq_printf(m, "," MNTOPT_SWIDTH "=%d",
+ (int)XFS_FSB_TO_BB(mp, mp->m_swidth));
+
+ if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
+ seq_puts(m, "," MNTOPT_USRQUOTA);
+ else if (mp->m_qflags & XFS_UQUOTA_ACCT)
+ seq_puts(m, "," MNTOPT_UQUOTANOENF);
+
+ /* Either project or group quotas can be active, not both */
+
+ if (mp->m_qflags & XFS_PQUOTA_ACCT) {
+ if (mp->m_qflags & XFS_OQUOTA_ENFD)
+ seq_puts(m, "," MNTOPT_PRJQUOTA);
+ else
+ seq_puts(m, "," MNTOPT_PQUOTANOENF);
+ } else if (mp->m_qflags & XFS_GQUOTA_ACCT) {
+ if (mp->m_qflags & XFS_OQUOTA_ENFD)
+ seq_puts(m, "," MNTOPT_GRPQUOTA);
+ else
+ seq_puts(m, "," MNTOPT_GQUOTANOENF);
+ }
+
+ if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
+ seq_puts(m, "," MNTOPT_NOQUOTA);
+
+ return 0;
+}
+__uint64_t
+xfs_max_file_offset(
+ unsigned int blockshift)
+{
+ unsigned int pagefactor = 1;
+ unsigned int bitshift = BITS_PER_LONG - 1;
+
+ /* Figure out maximum filesize, on Linux this can depend on
+ * the filesystem blocksize (on 32 bit platforms).
+ * __block_write_begin does this in an [unsigned] long...
+ * page->index << (PAGE_CACHE_SHIFT - bbits)
+ * So, for page sized blocks (4K on 32 bit platforms),
+ * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
+ * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
+ * but for smaller blocksizes it is less (bbits = log2 bsize).
+ * Note1: get_block_t takes a long (implicit cast from above)
+ * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
+ * can optionally convert the [unsigned] long from above into
+ * an [unsigned] long long.
+ */
+
+#if BITS_PER_LONG == 32
+# if defined(CONFIG_LBDAF)
+ ASSERT(sizeof(sector_t) == 8);
+ pagefactor = PAGE_CACHE_SIZE;
+ bitshift = BITS_PER_LONG;
+# else
+ pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
+# endif
+#endif
+
+ return (((__uint64_t)pagefactor) << bitshift) - 1;
+}
+
+STATIC int
+xfs_blkdev_get(
+ xfs_mount_t *mp,
+ const char *name,
+ struct block_device **bdevp)
+{
+ int error = 0;
+
+ *bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
+ mp);
+ if (IS_ERR(*bdevp)) {
+ error = PTR_ERR(*bdevp);
+ xfs_warn(mp, "Invalid device [%s], error=%d\n", name, error);
+ }
+
+ return -error;
+}
+
+STATIC void
+xfs_blkdev_put(
+ struct block_device *bdev)
+{
+ if (bdev)
+ blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+}
+
+void
+xfs_blkdev_issue_flush(
+ xfs_buftarg_t *buftarg)
+{
+ blkdev_issue_flush(buftarg->bt_bdev, GFP_KERNEL, NULL);
+}
+
+STATIC void
+xfs_close_devices(
+ struct xfs_mount *mp)
+{
+ if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
+ struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
+ xfs_free_buftarg(mp, mp->m_logdev_targp);
+ xfs_blkdev_put(logdev);
+ }
+ if (mp->m_rtdev_targp) {
+ struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
+ xfs_free_buftarg(mp, mp->m_rtdev_targp);
+ xfs_blkdev_put(rtdev);
+ }
+ xfs_free_buftarg(mp, mp->m_ddev_targp);
+}
+
+/*
+ * The file system configurations are:
+ * (1) device (partition) with data and internal log
+ * (2) logical volume with data and log subvolumes.
+ * (3) logical volume with data, log, and realtime subvolumes.
+ *
+ * We only have to handle opening the log and realtime volumes here if
+ * they are present. The data subvolume has already been opened by
+ * get_sb_bdev() and is stored in sb->s_bdev.
+ */
+STATIC int
+xfs_open_devices(
+ struct xfs_mount *mp)
+{
+ struct block_device *ddev = mp->m_super->s_bdev;
+ struct block_device *logdev = NULL, *rtdev = NULL;
+ int error;
+
+ /*
+ * Open real time and log devices - order is important.
+ */
+ if (mp->m_logname) {
+ error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
+ if (error)
+ goto out;
+ }
+
+ if (mp->m_rtname) {
+ error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
+ if (error)
+ goto out_close_logdev;
+
+ if (rtdev == ddev || rtdev == logdev) {
+ xfs_warn(mp,
+ "Cannot mount filesystem with identical rtdev and ddev/logdev.");
+ error = EINVAL;
+ goto out_close_rtdev;
+ }
+ }
+
+ /*
+ * Setup xfs_mount buffer target pointers
+ */
+ error = ENOMEM;
+ mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, 0, mp->m_fsname);
+ if (!mp->m_ddev_targp)
+ goto out_close_rtdev;
+
+ if (rtdev) {
+ mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, 1,
+ mp->m_fsname);
+ if (!mp->m_rtdev_targp)
+ goto out_free_ddev_targ;
+ }
+
+ if (logdev && logdev != ddev) {
+ mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, 1,
+ mp->m_fsname);
+ if (!mp->m_logdev_targp)
+ goto out_free_rtdev_targ;
+ } else {
+ mp->m_logdev_targp = mp->m_ddev_targp;
+ }
+
+ return 0;
+
+ out_free_rtdev_targ:
+ if (mp->m_rtdev_targp)
+ xfs_free_buftarg(mp, mp->m_rtdev_targp);
+ out_free_ddev_targ:
+ xfs_free_buftarg(mp, mp->m_ddev_targp);
+ out_close_rtdev:
+ if (rtdev)
+ xfs_blkdev_put(rtdev);
+ out_close_logdev:
+ if (logdev && logdev != ddev)
+ xfs_blkdev_put(logdev);
+ out:
+ return error;
+}
+
+/*
+ * Setup xfs_mount buffer target pointers based on superblock
+ */
+STATIC int
+xfs_setup_devices(
+ struct xfs_mount *mp)
+{
+ int error;
+
+ error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
+ mp->m_sb.sb_sectsize);
+ if (error)
+ return error;
+
+ if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
+ unsigned int log_sector_size = BBSIZE;
+
+ if (xfs_sb_version_hassector(&mp->m_sb))
+ log_sector_size = mp->m_sb.sb_logsectsize;
+ error = xfs_setsize_buftarg(mp->m_logdev_targp,
+ mp->m_sb.sb_blocksize,
+ log_sector_size);
+ if (error)
+ return error;
+ }
+ if (mp->m_rtdev_targp) {
+ error = xfs_setsize_buftarg(mp->m_rtdev_targp,
+ mp->m_sb.sb_blocksize,
+ mp->m_sb.sb_sectsize);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+/* Catch misguided souls that try to use this interface on XFS */
+STATIC struct inode *
+xfs_fs_alloc_inode(
+ struct super_block *sb)
+{
+ BUG();
+ return NULL;
+}
+
+/*
+ * Now that the generic code is guaranteed not to be accessing
+ * the linux inode, we can reclaim the inode.
+ */
+STATIC void
+xfs_fs_destroy_inode(
+ struct inode *inode)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+
+ trace_xfs_destroy_inode(ip);
+
+ XFS_STATS_INC(vn_reclaim);
+
+ /* bad inode, get out here ASAP */
+ if (is_bad_inode(inode))
+ goto out_reclaim;
+
+ xfs_ioend_wait(ip);
+
+ ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
+
+ /*
+ * We should never get here with one of the reclaim flags already set.
+ */
+ ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
+ ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));
+
+ /*
+ * We always use background reclaim here because even if the
+ * inode is clean, it still may be under IO and hence we have
+ * to take the flush lock. The background reclaim path handles
+ * this more efficiently than we can here, so simply let background
+ * reclaim tear down all inodes.
+ */
+out_reclaim:
+ xfs_inode_set_reclaim_tag(ip);
+}
+
+/*
+ * Slab object creation initialisation for the XFS inode.
+ * This covers only the idempotent fields in the XFS inode;
+ * all other fields need to be initialised on allocation
+ * from the slab. This avoids the need to repeatedly initialise
+ * fields in the xfs inode that left in the initialise state
+ * when freeing the inode.
+ */
+STATIC void
+xfs_fs_inode_init_once(
+ void *inode)
+{
+ struct xfs_inode *ip = inode;
+
+ memset(ip, 0, sizeof(struct xfs_inode));
+
+ /* vfs inode */
+ inode_init_once(VFS_I(ip));
+
+ /* xfs inode */
+ atomic_set(&ip->i_iocount, 0);
+ atomic_set(&ip->i_pincount, 0);
+ spin_lock_init(&ip->i_flags_lock);
+ init_waitqueue_head(&ip->i_ipin_wait);
+ /*
+ * Because we want to use a counting completion, complete
+ * the flush completion once to allow a single access to
+ * the flush completion without blocking.
+ */
+ init_completion(&ip->i_flush);
+ complete(&ip->i_flush);
+
+ mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
+ "xfsino", ip->i_ino);
+}
+
+/*
+ * Dirty the XFS inode when mark_inode_dirty_sync() is called so that
+ * we catch unlogged VFS level updates to the inode.
+ *
+ * We need the barrier() to maintain correct ordering between unlogged
+ * updates and the transaction commit code that clears the i_update_core
+ * field. This requires all updates to be completed before marking the
+ * inode dirty.
+ */
+STATIC void
+xfs_fs_dirty_inode(
+ struct inode *inode,
+ int flags)
+{
+ barrier();
+ XFS_I(inode)->i_update_core = 1;
+}
+
+STATIC int
+xfs_log_inode(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int error;
+
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
+ error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
+
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ /* we need to return with the lock hold shared */
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+ return error;
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ /*
+ * Note - it's possible that we might have pushed ourselves out of the
+ * way during trans_reserve which would flush the inode. But there's
+ * no guarantee that the inode buffer has actually gone out yet (it's
+ * delwri). Plus the buffer could be pinned anyway if it's part of
+ * an inode in another recent transaction. So we play it safe and
+ * fire off the transaction anyway.
+ */
+ xfs_trans_ijoin(tp, ip);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ error = xfs_trans_commit(tp, 0);
+ xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
+
+ return error;
+}
+
+STATIC int
+xfs_fs_write_inode(
+ struct inode *inode,
+ struct writeback_control *wbc)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ int error = EAGAIN;
+
+ trace_xfs_write_inode(ip);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return XFS_ERROR(EIO);
+
+ if (wbc->sync_mode == WB_SYNC_ALL) {
+ /*
+ * Make sure the inode has made it it into the log. Instead
+ * of forcing it all the way to stable storage using a
+ * synchronous transaction we let the log force inside the
+ * ->sync_fs call do that for thus, which reduces the number
+ * of synchronous log foces dramatically.
+ */
+ xfs_ioend_wait(ip);
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+ if (ip->i_update_core) {
+ error = xfs_log_inode(ip);
+ if (error)
+ goto out_unlock;
+ }
+ } else {
+ /*
+ * We make this non-blocking if the inode is contended, return
+ * EAGAIN to indicate to the caller that they did not succeed.
+ * This prevents the flush path from blocking on inodes inside
+ * another operation right now, they get caught later by
+ * xfs_sync.
+ */
+ if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
+ goto out;
+
+ if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip))
+ goto out_unlock;
+
+ /*
+ * Now we have the flush lock and the inode is not pinned, we
+ * can check if the inode is really clean as we know that
+ * there are no pending transaction completions, it is not
+ * waiting on the delayed write queue and there is no IO in
+ * progress.
+ */
+ if (xfs_inode_clean(ip)) {
+ xfs_ifunlock(ip);
+ error = 0;
+ goto out_unlock;
+ }
+ error = xfs_iflush(ip, SYNC_TRYLOCK);
+ }
+
+ out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ out:
+ /*
+ * if we failed to write out the inode then mark
+ * it dirty again so we'll try again later.
+ */
+ if (error)
+ xfs_mark_inode_dirty_sync(ip);
+ return -error;
+}
+
+STATIC void
+xfs_fs_evict_inode(
+ struct inode *inode)
+{
+ xfs_inode_t *ip = XFS_I(inode);
+
+ trace_xfs_evict_inode(ip);
+
+ truncate_inode_pages(&inode->i_data, 0);
+ end_writeback(inode);
+ XFS_STATS_INC(vn_rele);
+ XFS_STATS_INC(vn_remove);
+ XFS_STATS_DEC(vn_active);
+
+ /*
+ * The iolock is used by the file system to coordinate reads,
+ * writes, and block truncates. Up to this point the lock
+ * protected concurrent accesses by users of the inode. But
+ * from here forward we're doing some final processing of the
+ * inode because we're done with it, and although we reuse the
+ * iolock for protection it is really a distinct lock class
+ * (in the lockdep sense) from before. To keep lockdep happy
+ * (and basically indicate what we are doing), we explicitly
+ * re-init the iolock here.
+ */
+ ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
+ mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+ lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+ &xfs_iolock_reclaimable, "xfs_iolock_reclaimable");
+
+ xfs_inactive(ip);
+}
+
+STATIC void
+xfs_free_fsname(
+ struct xfs_mount *mp)
+{
+ kfree(mp->m_fsname);
+ kfree(mp->m_rtname);
+ kfree(mp->m_logname);
+}
+
+STATIC void
+xfs_fs_put_super(
+ struct super_block *sb)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+
+ xfs_syncd_stop(mp);
+
+ /*
+ * Blow away any referenced inode in the filestreams cache.
+ * This can and will cause log traffic as inodes go inactive
+ * here.
+ */
+ xfs_filestream_unmount(mp);
+
+ XFS_bflush(mp->m_ddev_targp);
+
+ xfs_unmountfs(mp);
+ xfs_freesb(mp);
+ xfs_icsb_destroy_counters(mp);
+ xfs_close_devices(mp);
+ xfs_free_fsname(mp);
+ kfree(mp);
+}
+
+STATIC int
+xfs_fs_sync_fs(
+ struct super_block *sb,
+ int wait)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+ int error;
+
+ /*
+ * Not much we can do for the first async pass. Writing out the
+ * superblock would be counter-productive as we are going to redirty
+ * when writing out other data and metadata (and writing out a single
+ * block is quite fast anyway).
+ *
+ * Try to asynchronously kick off quota syncing at least.
+ */
+ if (!wait) {
+ xfs_qm_sync(mp, SYNC_TRYLOCK);
+ return 0;
+ }
+
+ error = xfs_quiesce_data(mp);
+ if (error)
+ return -error;
+
+ if (laptop_mode) {
+ /*
+ * The disk must be active because we're syncing.
+ * We schedule xfssyncd now (now that the disk is
+ * active) instead of later (when it might not be).
+ */
+ flush_delayed_work_sync(&mp->m_sync_work);
+ }
+
+ return 0;
+}
+
+STATIC int
+xfs_fs_statfs(
+ struct dentry *dentry,
+ struct kstatfs *statp)
+{
+ struct xfs_mount *mp = XFS_M(dentry->d_sb);
+ xfs_sb_t *sbp = &mp->m_sb;
+ struct xfs_inode *ip = XFS_I(dentry->d_inode);
+ __uint64_t fakeinos, id;
+ xfs_extlen_t lsize;
+ __int64_t ffree;
+
+ statp->f_type = XFS_SB_MAGIC;
+ statp->f_namelen = MAXNAMELEN - 1;
+
+ id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
+ statp->f_fsid.val[0] = (u32)id;
+ statp->f_fsid.val[1] = (u32)(id >> 32);
+
+ xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
+
+ spin_lock(&mp->m_sb_lock);
+ statp->f_bsize = sbp->sb_blocksize;
+ lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
+ statp->f_blocks = sbp->sb_dblocks - lsize;
+ statp->f_bfree = statp->f_bavail =
+ sbp->sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
+ fakeinos = statp->f_bfree << sbp->sb_inopblog;
+ statp->f_files =
+ MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
+ if (mp->m_maxicount)
+ statp->f_files = min_t(typeof(statp->f_files),
+ statp->f_files,
+ mp->m_maxicount);
+
+ /* make sure statp->f_ffree does not underflow */
+ ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
+ statp->f_ffree = max_t(__int64_t, ffree, 0);
+
+ spin_unlock(&mp->m_sb_lock);
+
+ if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
+ ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
+ (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
+ xfs_qm_statvfs(ip, statp);
+ return 0;
+}
+
+STATIC void
+xfs_save_resvblks(struct xfs_mount *mp)
+{
+ __uint64_t resblks = 0;
+
+ mp->m_resblks_save = mp->m_resblks;
+ xfs_reserve_blocks(mp, &resblks, NULL);
+}
+
+STATIC void
+xfs_restore_resvblks(struct xfs_mount *mp)
+{
+ __uint64_t resblks;
+
+ if (mp->m_resblks_save) {
+ resblks = mp->m_resblks_save;
+ mp->m_resblks_save = 0;
+ } else
+ resblks = xfs_default_resblks(mp);
+
+ xfs_reserve_blocks(mp, &resblks, NULL);
+}
+
+STATIC int
+xfs_fs_remount(
+ struct super_block *sb,
+ int *flags,
+ char *options)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+ substring_t args[MAX_OPT_ARGS];
+ char *p;
+ int error;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_barrier:
+ mp->m_flags |= XFS_MOUNT_BARRIER;
+ break;
+ case Opt_nobarrier:
+ mp->m_flags &= ~XFS_MOUNT_BARRIER;
+ break;
+ default:
+ /*
+ * Logically we would return an error here to prevent
+ * users from believing they might have changed
+ * mount options using remount which can't be changed.
+ *
+ * But unfortunately mount(8) adds all options from
+ * mtab and fstab to the mount arguments in some cases
+ * so we can't blindly reject options, but have to
+ * check for each specified option if it actually
+ * differs from the currently set option and only
+ * reject it if that's the case.
+ *
+ * Until that is implemented we return success for
+ * every remount request, and silently ignore all
+ * options that we can't actually change.
+ */
+#if 0
+ xfs_info(mp,
+ "mount option \"%s\" not supported for remount\n", p);
+ return -EINVAL;
+#else
+ break;
+#endif
+ }
+ }
+
+ /* ro -> rw */
+ if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
+ mp->m_flags &= ~XFS_MOUNT_RDONLY;
+
+ /*
+ * If this is the first remount to writeable state we
+ * might have some superblock changes to update.
+ */
+ if (mp->m_update_flags) {
+ error = xfs_mount_log_sb(mp, mp->m_update_flags);
+ if (error) {
+ xfs_warn(mp, "failed to write sb changes");
+ return error;
+ }
+ mp->m_update_flags = 0;
+ }
+
+ /*
+ * Fill out the reserve pool if it is empty. Use the stashed
+ * value if it is non-zero, otherwise go with the default.
+ */
+ xfs_restore_resvblks(mp);
+ }
+
+ /* rw -> ro */
+ if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
+ /*
+ * After we have synced the data but before we sync the
+ * metadata, we need to free up the reserve block pool so that
+ * the used block count in the superblock on disk is correct at
+ * the end of the remount. Stash the current reserve pool size
+ * so that if we get remounted rw, we can return it to the same
+ * size.
+ */
+
+ xfs_quiesce_data(mp);
+ xfs_save_resvblks(mp);
+ xfs_quiesce_attr(mp);
+ mp->m_flags |= XFS_MOUNT_RDONLY;
+ }
+
+ return 0;
+}
+
+/*
+ * Second stage of a freeze. The data is already frozen so we only
+ * need to take care of the metadata. Once that's done write a dummy
+ * record to dirty the log in case of a crash while frozen.
+ */
+STATIC int
+xfs_fs_freeze(
+ struct super_block *sb)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+
+ xfs_save_resvblks(mp);
+ xfs_quiesce_attr(mp);
+ return -xfs_fs_log_dummy(mp);
+}
+
+STATIC int
+xfs_fs_unfreeze(
+ struct super_block *sb)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+
+ xfs_restore_resvblks(mp);
+ return 0;
+}
+
+STATIC int
+xfs_fs_show_options(
+ struct seq_file *m,
+ struct vfsmount *mnt)
+{
+ return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
+}
+
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock _has_ now been read in.
+ */
+STATIC int
+xfs_finish_flags(
+ struct xfs_mount *mp)
+{
+ int ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
+
+ /* Fail a mount where the logbuf is smaller than the log stripe */
+ if (xfs_sb_version_haslogv2(&mp->m_sb)) {
+ if (mp->m_logbsize <= 0 &&
+ mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
+ mp->m_logbsize = mp->m_sb.sb_logsunit;
+ } else if (mp->m_logbsize > 0 &&
+ mp->m_logbsize < mp->m_sb.sb_logsunit) {
+ xfs_warn(mp,
+ "logbuf size must be greater than or equal to log stripe size");
+ return XFS_ERROR(EINVAL);
+ }
+ } else {
+ /* Fail a mount if the logbuf is larger than 32K */
+ if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
+ xfs_warn(mp,
+ "logbuf size for version 1 logs must be 16K or 32K");
+ return XFS_ERROR(EINVAL);
+ }
+ }
+
+ /*
+ * mkfs'ed attr2 will turn on attr2 mount unless explicitly
+ * told by noattr2 to turn it off
+ */
+ if (xfs_sb_version_hasattr2(&mp->m_sb) &&
+ !(mp->m_flags & XFS_MOUNT_NOATTR2))
+ mp->m_flags |= XFS_MOUNT_ATTR2;
+
+ /*
+ * prohibit r/w mounts of read-only filesystems
+ */
+ if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
+ xfs_warn(mp,
+ "cannot mount a read-only filesystem as read-write");
+ return XFS_ERROR(EROFS);
+ }
+
+ return 0;
+}
+
+STATIC int
+xfs_fs_fill_super(
+ struct super_block *sb,
+ void *data,
+ int silent)
+{
+ struct inode *root;
+ struct xfs_mount *mp = NULL;
+ int flags = 0, error = ENOMEM;
+
+ mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
+ if (!mp)
+ goto out;
+
+ spin_lock_init(&mp->m_sb_lock);
+ mutex_init(&mp->m_growlock);
+ atomic_set(&mp->m_active_trans, 0);
+
+ mp->m_super = sb;
+ sb->s_fs_info = mp;
+
+ error = xfs_parseargs(mp, (char *)data);
+ if (error)
+ goto out_free_fsname;
+
+ sb_min_blocksize(sb, BBSIZE);
+ sb->s_xattr = xfs_xattr_handlers;
+ sb->s_export_op = &xfs_export_operations;
+#ifdef CONFIG_XFS_QUOTA
+ sb->s_qcop = &xfs_quotactl_operations;
+#endif
+ sb->s_op = &xfs_super_operations;
+
+ if (silent)
+ flags |= XFS_MFSI_QUIET;
+
+ error = xfs_open_devices(mp);
+ if (error)
+ goto out_free_fsname;
+
+ error = xfs_icsb_init_counters(mp);
+ if (error)
+ goto out_close_devices;
+
+ error = xfs_readsb(mp, flags);
+ if (error)
+ goto out_destroy_counters;
+
+ error = xfs_finish_flags(mp);
+ if (error)
+ goto out_free_sb;
+
+ error = xfs_setup_devices(mp);
+ if (error)
+ goto out_free_sb;
+
+ error = xfs_filestream_mount(mp);
+ if (error)
+ goto out_free_sb;
+
+ /*
+ * we must configure the block size in the superblock before we run the
+ * full mount process as the mount process can lookup and cache inodes.
+ * For the same reason we must also initialise the syncd and register
+ * the inode cache shrinker so that inodes can be reclaimed during
+ * operations like a quotacheck that iterate all inodes in the
+ * filesystem.
+ */
+ sb->s_magic = XFS_SB_MAGIC;
+ sb->s_blocksize = mp->m_sb.sb_blocksize;
+ sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
+ sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
+ sb->s_time_gran = 1;
+ set_posix_acl_flag(sb);
+
+ error = xfs_mountfs(mp);
+ if (error)
+ goto out_filestream_unmount;
+
+ error = xfs_syncd_init(mp);
+ if (error)
+ goto out_unmount;
+
+ root = igrab(VFS_I(mp->m_rootip));
+ if (!root) {
+ error = ENOENT;
+ goto out_syncd_stop;
+ }
+ if (is_bad_inode(root)) {
+ error = EINVAL;
+ goto out_syncd_stop;
+ }
+ sb->s_root = d_alloc_root(root);
+ if (!sb->s_root) {
+ error = ENOMEM;
+ goto out_iput;
+ }
+
+ return 0;
+
+ out_filestream_unmount:
+ xfs_filestream_unmount(mp);
+ out_free_sb:
+ xfs_freesb(mp);
+ out_destroy_counters:
+ xfs_icsb_destroy_counters(mp);
+ out_close_devices:
+ xfs_close_devices(mp);
+ out_free_fsname:
+ xfs_free_fsname(mp);
+ kfree(mp);
+ out:
+ return -error;
+
+ out_iput:
+ iput(root);
+ out_syncd_stop:
+ xfs_syncd_stop(mp);
+ out_unmount:
+ /*
+ * Blow away any referenced inode in the filestreams cache.
+ * This can and will cause log traffic as inodes go inactive
+ * here.
+ */
+ xfs_filestream_unmount(mp);
+
+ XFS_bflush(mp->m_ddev_targp);
+
+ xfs_unmountfs(mp);
+ goto out_free_sb;
+}
+
+STATIC struct dentry *
+xfs_fs_mount(
+ struct file_system_type *fs_type,
+ int flags,
+ const char *dev_name,
+ void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
+}
+
+static int
+xfs_fs_nr_cached_objects(
+ struct super_block *sb)
+{
+ return xfs_reclaim_inodes_count(XFS_M(sb));
+}
+
+static void
+xfs_fs_free_cached_objects(
+ struct super_block *sb,
+ int nr_to_scan)
+{
+ xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
+}
+
+static const struct super_operations xfs_super_operations = {
+ .alloc_inode = xfs_fs_alloc_inode,
+ .destroy_inode = xfs_fs_destroy_inode,
+ .dirty_inode = xfs_fs_dirty_inode,
+ .write_inode = xfs_fs_write_inode,
+ .evict_inode = xfs_fs_evict_inode,
+ .put_super = xfs_fs_put_super,
+ .sync_fs = xfs_fs_sync_fs,
+ .freeze_fs = xfs_fs_freeze,
+ .unfreeze_fs = xfs_fs_unfreeze,
+ .statfs = xfs_fs_statfs,
+ .remount_fs = xfs_fs_remount,
+ .show_options = xfs_fs_show_options,
+ .nr_cached_objects = xfs_fs_nr_cached_objects,
+ .free_cached_objects = xfs_fs_free_cached_objects,
+};
+
+static struct file_system_type xfs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "xfs",
+ .mount = xfs_fs_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+STATIC int __init
+xfs_init_zones(void)
+{
+
+ xfs_ioend_zone = kmem_zone_init(sizeof(xfs_ioend_t), "xfs_ioend");
+ if (!xfs_ioend_zone)
+ goto out;
+
+ xfs_ioend_pool = mempool_create_slab_pool(4 * MAX_BUF_PER_PAGE,
+ xfs_ioend_zone);
+ if (!xfs_ioend_pool)
+ goto out_destroy_ioend_zone;
+
+ xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
+ "xfs_log_ticket");
+ if (!xfs_log_ticket_zone)
+ goto out_destroy_ioend_pool;
+
+ xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
+ "xfs_bmap_free_item");
+ if (!xfs_bmap_free_item_zone)
+ goto out_destroy_log_ticket_zone;
+
+ xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
+ "xfs_btree_cur");
+ if (!xfs_btree_cur_zone)
+ goto out_destroy_bmap_free_item_zone;
+
+ xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
+ "xfs_da_state");
+ if (!xfs_da_state_zone)
+ goto out_destroy_btree_cur_zone;
+
+ xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
+ if (!xfs_dabuf_zone)
+ goto out_destroy_da_state_zone;
+
+ xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
+ if (!xfs_ifork_zone)
+ goto out_destroy_dabuf_zone;
+
+ xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
+ if (!xfs_trans_zone)
+ goto out_destroy_ifork_zone;
+
+ xfs_log_item_desc_zone =
+ kmem_zone_init(sizeof(struct xfs_log_item_desc),
+ "xfs_log_item_desc");
+ if (!xfs_log_item_desc_zone)
+ goto out_destroy_trans_zone;
+
+ /*
+ * The size of the zone allocated buf log item is the maximum
+ * size possible under XFS. This wastes a little bit of memory,
+ * but it is much faster.
+ */
+ xfs_buf_item_zone = kmem_zone_init((sizeof(xfs_buf_log_item_t) +
+ (((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) /
+ NBWORD) * sizeof(int))), "xfs_buf_item");
+ if (!xfs_buf_item_zone)
+ goto out_destroy_log_item_desc_zone;
+
+ xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
+ ((XFS_EFD_MAX_FAST_EXTENTS - 1) *
+ sizeof(xfs_extent_t))), "xfs_efd_item");
+ if (!xfs_efd_zone)
+ goto out_destroy_buf_item_zone;
+
+ xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
+ ((XFS_EFI_MAX_FAST_EXTENTS - 1) *
+ sizeof(xfs_extent_t))), "xfs_efi_item");
+ if (!xfs_efi_zone)
+ goto out_destroy_efd_zone;
+
+ xfs_inode_zone =
+ kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
+ KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD,
+ xfs_fs_inode_init_once);
+ if (!xfs_inode_zone)
+ goto out_destroy_efi_zone;
+
+ xfs_ili_zone =
+ kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
+ KM_ZONE_SPREAD, NULL);
+ if (!xfs_ili_zone)
+ goto out_destroy_inode_zone;
+
+ return 0;
+
+ out_destroy_inode_zone:
+ kmem_zone_destroy(xfs_inode_zone);
+ out_destroy_efi_zone:
+ kmem_zone_destroy(xfs_efi_zone);
+ out_destroy_efd_zone:
+ kmem_zone_destroy(xfs_efd_zone);
+ out_destroy_buf_item_zone:
+ kmem_zone_destroy(xfs_buf_item_zone);
+ out_destroy_log_item_desc_zone:
+ kmem_zone_destroy(xfs_log_item_desc_zone);
+ out_destroy_trans_zone:
+ kmem_zone_destroy(xfs_trans_zone);
+ out_destroy_ifork_zone:
+ kmem_zone_destroy(xfs_ifork_zone);
+ out_destroy_dabuf_zone:
+ kmem_zone_destroy(xfs_dabuf_zone);
+ out_destroy_da_state_zone:
+ kmem_zone_destroy(xfs_da_state_zone);
+ out_destroy_btree_cur_zone:
+ kmem_zone_destroy(xfs_btree_cur_zone);
+ out_destroy_bmap_free_item_zone:
+ kmem_zone_destroy(xfs_bmap_free_item_zone);
+ out_destroy_log_ticket_zone:
+ kmem_zone_destroy(xfs_log_ticket_zone);
+ out_destroy_ioend_pool:
+ mempool_destroy(xfs_ioend_pool);
+ out_destroy_ioend_zone:
+ kmem_zone_destroy(xfs_ioend_zone);
+ out:
+ return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_zones(void)
+{
+ kmem_zone_destroy(xfs_ili_zone);
+ kmem_zone_destroy(xfs_inode_zone);
+ kmem_zone_destroy(xfs_efi_zone);
+ kmem_zone_destroy(xfs_efd_zone);
+ kmem_zone_destroy(xfs_buf_item_zone);
+ kmem_zone_destroy(xfs_log_item_desc_zone);
+ kmem_zone_destroy(xfs_trans_zone);
+ kmem_zone_destroy(xfs_ifork_zone);
+ kmem_zone_destroy(xfs_dabuf_zone);
+ kmem_zone_destroy(xfs_da_state_zone);
+ kmem_zone_destroy(xfs_btree_cur_zone);
+ kmem_zone_destroy(xfs_bmap_free_item_zone);
+ kmem_zone_destroy(xfs_log_ticket_zone);
+ mempool_destroy(xfs_ioend_pool);
+ kmem_zone_destroy(xfs_ioend_zone);
+
+}
+
+STATIC int __init
+xfs_init_workqueues(void)
+{
+ /*
+ * max_active is set to 8 to give enough concurency to allow
+ * multiple work operations on each CPU to run. This allows multiple
+ * filesystems to be running sync work concurrently, and scales with
+ * the number of CPUs in the system.
+ */
+ xfs_syncd_wq = alloc_workqueue("xfssyncd", WQ_CPU_INTENSIVE, 8);
+ if (!xfs_syncd_wq)
+ goto out;
+
+ xfs_ail_wq = alloc_workqueue("xfsail", WQ_CPU_INTENSIVE, 8);
+ if (!xfs_ail_wq)
+ goto out_destroy_syncd;
+
+ return 0;
+
+out_destroy_syncd:
+ destroy_workqueue(xfs_syncd_wq);
+out:
+ return -ENOMEM;
+}
+
+STATIC void
+xfs_destroy_workqueues(void)
+{
+ destroy_workqueue(xfs_ail_wq);
+ destroy_workqueue(xfs_syncd_wq);
+}
+
+STATIC int __init
+init_xfs_fs(void)
+{
+ int error;
+
+ printk(KERN_INFO XFS_VERSION_STRING " with "
+ XFS_BUILD_OPTIONS " enabled\n");
+
+ xfs_ioend_init();
+ xfs_dir_startup();
+
+ error = xfs_init_zones();
+ if (error)
+ goto out;
+
+ error = xfs_init_workqueues();
+ if (error)
+ goto out_destroy_zones;
+
+ error = xfs_mru_cache_init();
+ if (error)
+ goto out_destroy_wq;
+
+ error = xfs_filestream_init();
+ if (error)
+ goto out_mru_cache_uninit;
+
+ error = xfs_buf_init();
+ if (error)
+ goto out_filestream_uninit;
+
+ error = xfs_init_procfs();
+ if (error)
+ goto out_buf_terminate;
+
+ error = xfs_sysctl_register();
+ if (error)
+ goto out_cleanup_procfs;
+
+ vfs_initquota();
+
+ error = register_filesystem(&xfs_fs_type);
+ if (error)
+ goto out_sysctl_unregister;
+ return 0;
+
+ out_sysctl_unregister:
+ xfs_sysctl_unregister();
+ out_cleanup_procfs:
+ xfs_cleanup_procfs();
+ out_buf_terminate:
+ xfs_buf_terminate();
+ out_filestream_uninit:
+ xfs_filestream_uninit();
+ out_mru_cache_uninit:
+ xfs_mru_cache_uninit();
+ out_destroy_wq:
+ xfs_destroy_workqueues();
+ out_destroy_zones:
+ xfs_destroy_zones();
+ out:
+ return error;
+}
+
+STATIC void __exit
+exit_xfs_fs(void)
+{
+ vfs_exitquota();
+ unregister_filesystem(&xfs_fs_type);
+ xfs_sysctl_unregister();
+ xfs_cleanup_procfs();
+ xfs_buf_terminate();
+ xfs_filestream_uninit();
+ xfs_mru_cache_uninit();
+ xfs_destroy_workqueues();
+ xfs_destroy_zones();
+}
+
+module_init(init_xfs_fs);
+module_exit(exit_xfs_fs);
+
+MODULE_AUTHOR("Silicon Graphics, Inc.");
+MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
+MODULE_LICENSE("GPL");