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linux/fs/xfs/linux-2.6/xfs_super.c
Takashi Sato c4be0c1dc4 filesystem freeze: add error handling of write_super_lockfs/unlockfs 
Currently, ext3 in mainline Linux doesn't have the freeze feature which
suspends write requests.  So, we cannot take a backup which keeps the
filesystem's consistency with the storage device's features (snapshot and
replication) while it is mounted.

In many case, a commercial filesystem (e.g.  VxFS) has the freeze feature
and it would be used to get the consistent backup.

If Linux's standard filesystem ext3 has the freeze feature, we can do it
without a commercial filesystem.

So I have implemented the ioctls of the freeze feature.
I think we can take the consistent backup with the following steps.
1. Freeze the filesystem with the freeze ioctl.
2. Separate the replication volume or create the snapshot
   with the storage device's feature.
3. Unfreeze the filesystem with the unfreeze ioctl.
4. Take the backup from the separated replication volume
   or the snapshot.

This patch:

VFS:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that they can return an error.
Rename write_super_lockfs and unlockfs of the super block operation
freeze_fs and unfreeze_fs to avoid a confusion.

ext3, ext4, xfs, gfs2, jfs:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that write_super_lockfs returns an error if needed,
and unlockfs always returns 0.

reiserfs:
Changed the type of write_super_lockfs and unlockfs from "void"
to "int" so that they always return 0 (success) to keep a current behavior.

Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
Signed-off-by: Masayuki Hamaguchi <m-hamaguchi@ys.jp.nec.com>
Cc: <xfs-masters@oss.sgi.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Alasdair G Kergon <agk@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-09 16:54:42 -08:00

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/*
* 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_dmapi.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_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_btree_trace.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_rw.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_buf_item.h"
#include "xfs_utils.h"
#include "xfs_vnodeops.h"
#include "xfs_version.h"
#include "xfs_log_priv.h"
#include "xfs_trans_priv.h"
#include "xfs_filestream.h"
#include "xfs_da_btree.h"
#include "xfs_dir2_trace.h"
#include "xfs_extfree_item.h"
#include "xfs_mru_cache.h"
#include "xfs_inode_item.h"
#include "xfs_sync.h"
#include <linux/namei.h>
#include <linux/init.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 struct quotactl_ops xfs_quotactl_operations;
static 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_INO64 "ino64" /* force inodes into 64-bit range */
#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_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */
#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_DMAPI "dmapi" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_XDSM "xdsm" /* DMI enabled (DMAPI / XDSM) */
#define MNTOPT_DMI "dmi" /* DMI enabled (DMAPI / XDSM) */
/*
* 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,
char **mtpt)
{
struct super_block *sb = mp->m_super;
char *this_char, *value, *eov;
int dsunit = 0;
int dswidth = 0;
int iosize = 0;
int dmapi_implies_ikeep = 1;
uchar_t iosizelog = 0;
/*
* 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;
/*
* 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) {
cmn_err(CE_WARN,
"XFS: %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) {
cmn_err(CE_WARN,
"XFS: %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) {
cmn_err(CE_WARN,
"XFS: %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)) {
if (!value || !*value) {
cmn_err(CE_WARN,
"XFS: %s option requires an argument",
this_char);
return EINVAL;
}
*mtpt = kstrndup(value, MAXNAMELEN, GFP_KERNEL);
if (!*mtpt)
return ENOMEM;
} else if (!strcmp(this_char, MNTOPT_RTDEV)) {
if (!value || !*value) {
cmn_err(CE_WARN,
"XFS: %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) {
cmn_err(CE_WARN,
"XFS: %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) {
cmn_err(CE_WARN,
"XFS: %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_OSYNCISOSYNC)) {
mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
} else if (!strcmp(this_char, MNTOPT_NORECOVERY)) {
mp->m_flags |= XFS_MOUNT_NORECOVERY;
} else if (!strcmp(this_char, MNTOPT_INO64)) {
#if XFS_BIG_INUMS
mp->m_flags |= XFS_MOUNT_INO64;
mp->m_inoadd = XFS_INO64_OFFSET;
#else
cmn_err(CE_WARN,
"XFS: %s option not allowed on this system",
this_char);
return EINVAL;
#endif
} 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) {
cmn_err(CE_WARN,
"XFS: %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) {
cmn_err(CE_WARN,
"XFS: %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
cmn_err(CE_WARN,
"XFS: %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)) {
dmapi_implies_ikeep = 0;
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_DMAPI)) {
mp->m_flags |= XFS_MOUNT_DMAPI;
} else if (!strcmp(this_char, MNTOPT_XDSM)) {
mp->m_flags |= XFS_MOUNT_DMAPI;
} else if (!strcmp(this_char, MNTOPT_DMI)) {
mp->m_flags |= XFS_MOUNT_DMAPI;
} else if (!strcmp(this_char, "ihashsize")) {
cmn_err(CE_WARN,
"XFS: ihashsize no longer used, option is deprecated.");
} else if (!strcmp(this_char, "osyncisdsync")) {
/* no-op, this is now the default */
cmn_err(CE_WARN,
"XFS: osyncisdsync is now the default, option is deprecated.");
} else if (!strcmp(this_char, "irixsgid")) {
cmn_err(CE_WARN,
"XFS: irixsgid is now a sysctl(2) variable, option is deprecated.");
} else {
cmn_err(CE_WARN,
"XFS: 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)) {
cmn_err(CE_WARN, "XFS: no-recovery mounts must be read-only.");
return EINVAL;
}
if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
cmn_err(CE_WARN,
"XFS: sunit and swidth options incompatible with the noalign option");
return EINVAL;
}
if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
(mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
cmn_err(CE_WARN,
"XFS: cannot mount with both project and group quota");
return EINVAL;
}
if ((mp->m_flags & XFS_MOUNT_DMAPI) && (!*mtpt || *mtpt[0] == '\0')) {
printk("XFS: %s option needs the mount point option as well\n",
MNTOPT_DMAPI);
return EINVAL;
}
if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
cmn_err(CE_WARN,
"XFS: sunit and swidth must be specified together");
return EINVAL;
}
if (dsunit && (dswidth % dsunit != 0)) {
cmn_err(CE_WARN,
"XFS: stripe width (%d) must be a multiple of the stripe unit (%d)",
dswidth, dsunit);
return EINVAL;
}
/*
* Applications using DMI filesystems often expect the
* inode generation number to be monotonically increasing.
* If we delete inode chunks we break this assumption, so
* keep unused inode chunks on disk for DMI filesystems
* until we come up with a better solution.
* Note that if "ikeep" or "noikeep" mount options are
* supplied, then they are honored.
*/
if ((mp->m_flags & XFS_MOUNT_DMAPI) && dmapi_implies_ikeep)
mp->m_flags |= XFS_MOUNT_IKEEP;
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)) {
cmn_err(CE_WARN,
"XFS: 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))) {
cmn_err(CE_WARN,
"XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
mp->m_logbsize);
return XFS_ERROR(EINVAL);
}
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;
if (iosizelog) {
if (iosizelog > XFS_MAX_IO_LOG ||
iosizelog < XFS_MIN_IO_LOG) {
cmn_err(CE_WARN,
"XFS: 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_INO64, "," MNTOPT_INO64 },
{ XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN },
{ XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC },
{ XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID },
{ XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY },
{ XFS_MOUNT_OSYNCISOSYNC, "," MNTOPT_OSYNCISOSYNC },
{ XFS_MOUNT_ATTR2, "," MNTOPT_ATTR2 },
{ XFS_MOUNT_FILESTREAMS, "," MNTOPT_FILESTREAM },
{ XFS_MOUNT_DMAPI, "," MNTOPT_DMAPI },
{ XFS_MOUNT_GRPID, "," MNTOPT_GRPID },
{ 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);
if (mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
seq_puts(m, "," MNTOPT_PRJQUOTA);
else if (mp->m_qflags & XFS_PQUOTA_ACCT)
seq_puts(m, "," MNTOPT_PQUOTANOENF);
if (mp->m_qflags & (XFS_GQUOTA_ACCT|XFS_OQUOTA_ENFD))
seq_puts(m, "," MNTOPT_GRPQUOTA);
else if (mp->m_qflags & XFS_GQUOTA_ACCT)
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_prepare_write 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_LBD)
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;
}
int
xfs_blkdev_get(
xfs_mount_t *mp,
const char *name,
struct block_device **bdevp)
{
int error = 0;
*bdevp = open_bdev_exclusive(name, FMODE_READ|FMODE_WRITE, mp);
if (IS_ERR(*bdevp)) {
error = PTR_ERR(*bdevp);
printk("XFS: Invalid device [%s], error=%d\n", name, error);
}
return -error;
}
void
xfs_blkdev_put(
struct block_device *bdev)
{
if (bdev)
close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
}
/*
* Try to write out the superblock using barriers.
*/
STATIC int
xfs_barrier_test(
xfs_mount_t *mp)
{
xfs_buf_t *sbp = xfs_getsb(mp, 0);
int error;
XFS_BUF_UNDONE(sbp);
XFS_BUF_UNREAD(sbp);
XFS_BUF_UNDELAYWRITE(sbp);
XFS_BUF_WRITE(sbp);
XFS_BUF_UNASYNC(sbp);
XFS_BUF_ORDERED(sbp);
xfsbdstrat(mp, sbp);
error = xfs_iowait(sbp);
/*
* Clear all the flags we set and possible error state in the
* buffer. We only did the write to try out whether barriers
* worked and shouldn't leave any traces in the superblock
* buffer.
*/
XFS_BUF_DONE(sbp);
XFS_BUF_ERROR(sbp, 0);
XFS_BUF_UNORDERED(sbp);
xfs_buf_relse(sbp);
return error;
}
void
xfs_mountfs_check_barriers(xfs_mount_t *mp)
{
int error;
if (mp->m_logdev_targp != mp->m_ddev_targp) {
xfs_fs_cmn_err(CE_NOTE, mp,
"Disabling barriers, not supported with external log device");
mp->m_flags &= ~XFS_MOUNT_BARRIER;
return;
}
if (xfs_readonly_buftarg(mp->m_ddev_targp)) {
xfs_fs_cmn_err(CE_NOTE, mp,
"Disabling barriers, underlying device is readonly");
mp->m_flags &= ~XFS_MOUNT_BARRIER;
return;
}
error = xfs_barrier_test(mp);
if (error) {
xfs_fs_cmn_err(CE_NOTE, mp,
"Disabling barriers, trial barrier write failed");
mp->m_flags &= ~XFS_MOUNT_BARRIER;
return;
}
}
void
xfs_blkdev_issue_flush(
xfs_buftarg_t *buftarg)
{
blkdev_issue_flush(buftarg->bt_bdev, 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->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->m_rtdev_targp);
xfs_blkdev_put(rtdev);
}
xfs_free_buftarg(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) {
cmn_err(CE_WARN,
"XFS: 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(ddev, 0);
if (!mp->m_ddev_targp)
goto out_close_rtdev;
if (rtdev) {
mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
if (!mp->m_rtdev_targp)
goto out_free_ddev_targ;
}
if (logdev && logdev != ddev) {
mp->m_logdev_targp = xfs_alloc_buftarg(logdev, 1);
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->m_rtdev_targp);
out_free_ddev_targ:
xfs_free_buftarg(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;
}
/*
* XFS AIL push thread support
*/
void
xfsaild_wakeup(
struct xfs_ail *ailp,
xfs_lsn_t threshold_lsn)
{
ailp->xa_target = threshold_lsn;
wake_up_process(ailp->xa_task);
}
int
xfsaild(
void *data)
{
struct xfs_ail *ailp = data;
xfs_lsn_t last_pushed_lsn = 0;
long tout = 0;
while (!kthread_should_stop()) {
if (tout)
schedule_timeout_interruptible(msecs_to_jiffies(tout));
tout = 1000;
/* swsusp */
try_to_freeze();
ASSERT(ailp->xa_mount->m_log);
if (XFS_FORCED_SHUTDOWN(ailp->xa_mount))
continue;
tout = xfsaild_push(ailp, &last_pushed_lsn);
}
return 0;
} /* xfsaild */
int
xfsaild_start(
struct xfs_ail *ailp)
{
ailp->xa_target = 0;
ailp->xa_task = kthread_run(xfsaild, ailp, "xfsaild");
if (IS_ERR(ailp->xa_task))
return -PTR_ERR(ailp->xa_task);
return 0;
}
void
xfsaild_stop(
struct xfs_ail *ailp)
{
kthread_stop(ailp->xa_task);
}
/* 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)
{
xfs_inode_t *ip = XFS_I(inode);
XFS_STATS_INC(vn_reclaim);
if (xfs_reclaim(ip))
panic("%s: cannot reclaim 0x%p\n", __func__, inode);
}
/*
* 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 intialise
* 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);
mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
}
/*
* Attempt to flush the inode, this will actually fail
* if the inode is pinned, but we dirty the inode again
* at the point when it is unpinned after a log write,
* since this is when the inode itself becomes flushable.
*/
STATIC int
xfs_fs_write_inode(
struct inode *inode,
int sync)
{
struct xfs_inode *ip = XFS_I(inode);
int error = 0;
int flags = 0;
xfs_itrace_entry(ip);
if (sync) {
error = xfs_wait_on_pages(ip, 0, -1);
if (error)
goto out_error;
flags |= FLUSH_SYNC;
}
error = xfs_inode_flush(ip, flags);
out_error:
/*
* 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_clear_inode(
struct inode *inode)
{
xfs_inode_t *ip = XFS_I(inode);
xfs_itrace_entry(ip);
XFS_STATS_INC(vn_rele);
XFS_STATS_INC(vn_remove);
XFS_STATS_DEC(vn_active);
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);
struct xfs_inode *rip = mp->m_rootip;
int unmount_event_flags = 0;
xfs_syncd_stop(mp);
xfs_sync_inodes(mp, SYNC_ATTR|SYNC_DELWRI);
#ifdef HAVE_DMAPI
if (mp->m_flags & XFS_MOUNT_DMAPI) {
unmount_event_flags =
(mp->m_dmevmask & (1 << DM_EVENT_UNMOUNT)) ?
0 : DM_FLAGS_UNWANTED;
/*
* Ignore error from dmapi here, first unmount is not allowed
* to fail anyway, and second we wouldn't want to fail a
* unmount because of dmapi.
*/
XFS_SEND_PREUNMOUNT(mp, rip, DM_RIGHT_NULL, rip, DM_RIGHT_NULL,
NULL, NULL, 0, 0, unmount_event_flags);
}
#endif
/*
* 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);
if (mp->m_flags & XFS_MOUNT_DMAPI) {
XFS_SEND_UNMOUNT(mp, rip, DM_RIGHT_NULL, 0, 0,
unmount_event_flags);
}
xfs_unmountfs(mp);
xfs_freesb(mp);
xfs_icsb_destroy_counters(mp);
xfs_close_devices(mp);
xfs_qmops_put(mp);
xfs_dmops_put(mp);
xfs_free_fsname(mp);
kfree(mp);
}
STATIC void
xfs_fs_write_super(
struct super_block *sb)
{
if (!(sb->s_flags & MS_RDONLY))
xfs_sync_fsdata(XFS_M(sb), 0);
sb->s_dirt = 0;
}
STATIC int
xfs_fs_sync_super(
struct super_block *sb,
int wait)
{
struct xfs_mount *mp = XFS_M(sb);
int error;
/*
* Treat a sync operation like a freeze. This is to work
* around a race in sync_inodes() which works in two phases
* - an asynchronous flush, which can write out an inode
* without waiting for file size updates to complete, and a
* synchronous flush, which wont do anything because the
* async flush removed the inode's dirty flag. Also
* sync_inodes() will not see any files that just have
* outstanding transactions to be flushed because we don't
* dirty the Linux inode until after the transaction I/O
* completes.
*/
if (wait || unlikely(sb->s_frozen == SB_FREEZE_WRITE))
error = xfs_quiesce_data(mp);
else
error = xfs_sync_fsdata(mp, 0);
sb->s_dirt = 0;
if (unlikely(laptop_mode)) {
int prev_sync_seq = mp->m_sync_seq;
/*
* 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).
*/
wake_up_process(mp->m_sync_task);
/*
* We have to wait for the sync iteration to complete.
* If we don't, the disk activity caused by the sync
* will come after the sync is completed, and that
* triggers another sync from laptop mode.
*/
wait_event(mp->m_wait_single_sync_task,
mp->m_sync_seq != prev_sync_seq);
}
return -error;
}
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;
__uint64_t fakeinos, id;
xfs_extlen_t lsize;
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;
#if XFS_BIG_INUMS
fakeinos += mp->m_inoadd;
#endif
statp->f_files =
MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER);
if (mp->m_maxicount)
#if XFS_BIG_INUMS
if (!mp->m_inoadd)
#endif
statp->f_files = min_t(typeof(statp->f_files),
statp->f_files,
mp->m_maxicount);
statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
spin_unlock(&mp->m_sb_lock);
XFS_QM_DQSTATVFS(XFS_I(dentry->d_inode), statp);
return 0;
}
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;
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;
/*
* Test if barriers are actually working if we can,
* else delay this check until the filesystem is
* marked writeable.
*/
if (!(mp->m_flags & XFS_MOUNT_RDONLY))
xfs_mountfs_check_barriers(mp);
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
printk(KERN_INFO
"XFS: mount option \"%s\" not supported for remount\n", p);
return -EINVAL;
#else
break;
#endif
}
}
/* rw/ro -> rw */
if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & MS_RDONLY)) {
mp->m_flags &= ~XFS_MOUNT_RDONLY;
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_mountfs_check_barriers(mp);
}
/* rw -> ro */
if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & MS_RDONLY)) {
xfs_quiesce_data(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_quiesce_attr(mp);
return -xfs_fs_log_dummy(mp);
}
STATIC int
xfs_fs_show_options(
struct seq_file *m,
struct vfsmount *mnt)
{
return -xfs_showargs(XFS_M(mnt->mnt_sb), m);
}
STATIC int
xfs_fs_quotasync(
struct super_block *sb,
int type)
{
return -XFS_QM_QUOTACTL(XFS_M(sb), Q_XQUOTASYNC, 0, NULL);
}
STATIC int
xfs_fs_getxstate(
struct super_block *sb,
struct fs_quota_stat *fqs)
{
return -XFS_QM_QUOTACTL(XFS_M(sb), Q_XGETQSTAT, 0, (caddr_t)fqs);
}
STATIC int
xfs_fs_setxstate(
struct super_block *sb,
unsigned int flags,
int op)
{
return -XFS_QM_QUOTACTL(XFS_M(sb), op, 0, (caddr_t)&flags);
}
STATIC int
xfs_fs_getxquota(
struct super_block *sb,
int type,
qid_t id,
struct fs_disk_quota *fdq)
{
return -XFS_QM_QUOTACTL(XFS_M(sb),
(type == USRQUOTA) ? Q_XGETQUOTA :
((type == GRPQUOTA) ? Q_XGETGQUOTA :
Q_XGETPQUOTA), id, (caddr_t)fdq);
}
STATIC int
xfs_fs_setxquota(
struct super_block *sb,
int type,
qid_t id,
struct fs_disk_quota *fdq)
{
return -XFS_QM_QUOTACTL(XFS_M(sb),
(type == USRQUOTA) ? Q_XSETQLIM :
((type == GRPQUOTA) ? Q_XSETGQLIM :
Q_XSETPQLIM), id, (caddr_t)fdq);
}
/*
* 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) {
cmn_err(CE_WARN,
"XFS: 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) {
cmn_err(CE_WARN,
"XFS: 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) {
cmn_err(CE_WARN,
"XFS: 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;
char *mtpt = NULL;
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);
INIT_LIST_HEAD(&mp->m_sync_list);
spin_lock_init(&mp->m_sync_lock);
init_waitqueue_head(&mp->m_wait_single_sync_task);
mp->m_super = sb;
sb->s_fs_info = mp;
error = xfs_parseargs(mp, (char *)data, &mtpt);
if (error)
goto out_free_fsname;
sb_min_blocksize(sb, BBSIZE);
sb->s_xattr = xfs_xattr_handlers;
sb->s_export_op = &xfs_export_operations;
sb->s_qcop = &xfs_quotactl_operations;
sb->s_op = &xfs_super_operations;
error = xfs_dmops_get(mp);
if (error)
goto out_free_fsname;
error = xfs_qmops_get(mp);
if (error)
goto out_put_dmops;
if (silent)
flags |= XFS_MFSI_QUIET;
error = xfs_open_devices(mp);
if (error)
goto out_put_qmops;
if (xfs_icsb_init_counters(mp))
mp->m_flags |= XFS_MOUNT_NO_PERCPU_SB;
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;
if (mp->m_flags & XFS_MOUNT_BARRIER)
xfs_mountfs_check_barriers(mp);
error = xfs_filestream_mount(mp);
if (error)
goto out_free_sb;
error = xfs_mountfs(mp);
if (error)
goto out_filestream_unmount;
XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, mtpt, mp->m_fsname);
sb->s_dirt = 1;
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);
root = igrab(VFS_I(mp->m_rootip));
if (!root) {
error = ENOENT;
goto fail_unmount;
}
if (is_bad_inode(root)) {
error = EINVAL;
goto fail_vnrele;
}
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
error = ENOMEM;
goto fail_vnrele;
}
error = xfs_syncd_init(mp);
if (error)
goto fail_vnrele;
kfree(mtpt);
xfs_itrace_exit(XFS_I(sb->s_root->d_inode));
return 0;
out_filestream_unmount:
xfs_filestream_unmount(mp);
out_free_sb:
xfs_freesb(mp);
out_destroy_counters:
xfs_icsb_destroy_counters(mp);
xfs_close_devices(mp);
out_put_qmops:
xfs_qmops_put(mp);
out_put_dmops:
xfs_dmops_put(mp);
out_free_fsname:
xfs_free_fsname(mp);
kfree(mtpt);
kfree(mp);
out:
return -error;
fail_vnrele:
if (sb->s_root) {
dput(sb->s_root);
sb->s_root = NULL;
} else {
iput(root);
}
fail_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 int
xfs_fs_get_sb(
struct file_system_type *fs_type,
int flags,
const char *dev_name,
void *data,
struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super,
mnt);
}
static struct super_operations xfs_super_operations = {
.alloc_inode = xfs_fs_alloc_inode,
.destroy_inode = xfs_fs_destroy_inode,
.write_inode = xfs_fs_write_inode,
.clear_inode = xfs_fs_clear_inode,
.put_super = xfs_fs_put_super,
.write_super = xfs_fs_write_super,
.sync_fs = xfs_fs_sync_super,
.freeze_fs = xfs_fs_freeze,
.statfs = xfs_fs_statfs,
.remount_fs = xfs_fs_remount,
.show_options = xfs_fs_show_options,
};
static struct quotactl_ops xfs_quotactl_operations = {
.quota_sync = xfs_fs_quotasync,
.get_xstate = xfs_fs_getxstate,
.set_xstate = xfs_fs_setxstate,
.get_xquota = xfs_fs_getxquota,
.set_xquota = xfs_fs_setxquota,
};
static struct file_system_type xfs_fs_type = {
.owner = THIS_MODULE,
.name = "xfs",
.get_sb = xfs_fs_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
STATIC int __init
xfs_alloc_trace_bufs(void)
{
#ifdef XFS_ALLOC_TRACE
xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_MAYFAIL);
if (!xfs_alloc_trace_buf)
goto out;
#endif
#ifdef XFS_BMAP_TRACE
xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_MAYFAIL);
if (!xfs_bmap_trace_buf)
goto out_free_alloc_trace;
#endif
#ifdef XFS_BTREE_TRACE
xfs_allocbt_trace_buf = ktrace_alloc(XFS_ALLOCBT_TRACE_SIZE,
KM_MAYFAIL);
if (!xfs_allocbt_trace_buf)
goto out_free_bmap_trace;
xfs_inobt_trace_buf = ktrace_alloc(XFS_INOBT_TRACE_SIZE, KM_MAYFAIL);
if (!xfs_inobt_trace_buf)
goto out_free_allocbt_trace;
xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_MAYFAIL);
if (!xfs_bmbt_trace_buf)
goto out_free_inobt_trace;
#endif
#ifdef XFS_ATTR_TRACE
xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_MAYFAIL);
if (!xfs_attr_trace_buf)
goto out_free_bmbt_trace;
#endif
#ifdef XFS_DIR2_TRACE
xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_MAYFAIL);
if (!xfs_dir2_trace_buf)
goto out_free_attr_trace;
#endif
return 0;
#ifdef XFS_DIR2_TRACE
out_free_attr_trace:
#endif
#ifdef XFS_ATTR_TRACE
ktrace_free(xfs_attr_trace_buf);
out_free_bmbt_trace:
#endif
#ifdef XFS_BTREE_TRACE
ktrace_free(xfs_bmbt_trace_buf);
out_free_inobt_trace:
ktrace_free(xfs_inobt_trace_buf);
out_free_allocbt_trace:
ktrace_free(xfs_allocbt_trace_buf);
out_free_bmap_trace:
#endif
#ifdef XFS_BMAP_TRACE
ktrace_free(xfs_bmap_trace_buf);
out_free_alloc_trace:
#endif
#ifdef XFS_ALLOC_TRACE
ktrace_free(xfs_alloc_trace_buf);
out:
#endif
return -ENOMEM;
}
STATIC void
xfs_free_trace_bufs(void)
{
#ifdef XFS_DIR2_TRACE
ktrace_free(xfs_dir2_trace_buf);
#endif
#ifdef XFS_ATTR_TRACE
ktrace_free(xfs_attr_trace_buf);
#endif
#ifdef XFS_BTREE_TRACE
ktrace_free(xfs_bmbt_trace_buf);
ktrace_free(xfs_inobt_trace_buf);
ktrace_free(xfs_allocbt_trace_buf);
#endif
#ifdef XFS_BMAP_TRACE
ktrace_free(xfs_bmap_trace_buf);
#endif
#ifdef XFS_ALLOC_TRACE
ktrace_free(xfs_alloc_trace_buf);
#endif
}
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;
/*
* 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_BLI_CHUNK) /
NBWORD) * sizeof(int))), "xfs_buf_item");
if (!xfs_buf_item_zone)
goto out_destroy_trans_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;
#ifdef CONFIG_XFS_POSIX_ACL
xfs_acl_zone = kmem_zone_init(sizeof(xfs_acl_t), "xfs_acl");
if (!xfs_acl_zone)
goto out_destroy_ili_zone;
#endif
return 0;
#ifdef CONFIG_XFS_POSIX_ACL
out_destroy_ili_zone:
#endif
kmem_zone_destroy(xfs_ili_zone);
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_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)
{
#ifdef CONFIG_XFS_POSIX_ACL
kmem_zone_destroy(xfs_acl_zone);
#endif
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_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
init_xfs_fs(void)
{
int error;
printk(KERN_INFO XFS_VERSION_STRING " with "
XFS_BUILD_OPTIONS " enabled\n");
ktrace_init(64);
xfs_ioend_init();
xfs_dir_startup();
error = xfs_init_zones();
if (error)
goto out;
error = xfs_alloc_trace_bufs();
if (error)
goto out_destroy_zones;
error = xfs_mru_cache_init();
if (error)
goto out_free_trace_buffers;
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_free_trace_buffers:
xfs_free_trace_bufs();
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_free_trace_bufs();
xfs_destroy_zones();
ktrace_uninit();
}
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");
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