File: [Development] / xfs-linux-nodel / xfs_mount.c (download)
Revision 1.305, Mon Oct 14 16:58:53 2002 UTC (15 years ago) by hch
Branch: MAIN
Changes since 1.304: +2 -2
lines
Revert VMAP() to the old IRIX prototype. Vnode and Linux inode are closely
tied together nowdays so that we don't have to pass in the Linux inode
separately.
Adjust for new old VMAP() calling convention.
|
/*
* Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#include <xfs.h>
#include <linux/major.h>
#include <linux/pagemap.h>
#ifndef EVMS_MAJOR
#define EVMS_MAJOR 117
#endif
STATIC void xfs_mount_reset_sbqflags(xfs_mount_t *);
STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
STATIC int xfs_uuid_mount(xfs_mount_t *);
mutex_t xfs_uuidtabmon; /* monitor for uuidtab */
STATIC int xfs_uuidtab_size;
STATIC uuid_t *xfs_uuidtab;
STATIC void xfs_uuid_unmount(xfs_mount_t *);
void xfs_xlatesb(void *, xfs_sb_t *, int, xfs_arch_t, __int64_t);
static struct {
short offset;
short type; /* 0 = integer
* 1 = binary / string (no translation)
*/
} xfs_sb_info[] = {
{ offsetof(xfs_sb_t, sb_magicnum), 0 },
{ offsetof(xfs_sb_t, sb_blocksize), 0 },
{ offsetof(xfs_sb_t, sb_dblocks), 0 },
{ offsetof(xfs_sb_t, sb_rblocks), 0 },
{ offsetof(xfs_sb_t, sb_rextents), 0 },
{ offsetof(xfs_sb_t, sb_uuid), 1 },
{ offsetof(xfs_sb_t, sb_logstart), 0 },
{ offsetof(xfs_sb_t, sb_rootino), 0 },
{ offsetof(xfs_sb_t, sb_rbmino), 0 },
{ offsetof(xfs_sb_t, sb_rsumino), 0 },
{ offsetof(xfs_sb_t, sb_rextsize), 0 },
{ offsetof(xfs_sb_t, sb_agblocks), 0 },
{ offsetof(xfs_sb_t, sb_agcount), 0 },
{ offsetof(xfs_sb_t, sb_rbmblocks), 0 },
{ offsetof(xfs_sb_t, sb_logblocks), 0 },
{ offsetof(xfs_sb_t, sb_versionnum), 0 },
{ offsetof(xfs_sb_t, sb_sectsize), 0 },
{ offsetof(xfs_sb_t, sb_inodesize), 0 },
{ offsetof(xfs_sb_t, sb_inopblock), 0 },
{ offsetof(xfs_sb_t, sb_fname[0]), 1 },
{ offsetof(xfs_sb_t, sb_blocklog), 0 },
{ offsetof(xfs_sb_t, sb_sectlog), 0 },
{ offsetof(xfs_sb_t, sb_inodelog), 0 },
{ offsetof(xfs_sb_t, sb_inopblog), 0 },
{ offsetof(xfs_sb_t, sb_agblklog), 0 },
{ offsetof(xfs_sb_t, sb_rextslog), 0 },
{ offsetof(xfs_sb_t, sb_inprogress), 0 },
{ offsetof(xfs_sb_t, sb_imax_pct), 0 },
{ offsetof(xfs_sb_t, sb_icount), 0 },
{ offsetof(xfs_sb_t, sb_ifree), 0 },
{ offsetof(xfs_sb_t, sb_fdblocks), 0 },
{ offsetof(xfs_sb_t, sb_frextents), 0 },
{ offsetof(xfs_sb_t, sb_uquotino), 0 },
{ offsetof(xfs_sb_t, sb_gquotino), 0 },
{ offsetof(xfs_sb_t, sb_qflags), 0 },
{ offsetof(xfs_sb_t, sb_flags), 0 },
{ offsetof(xfs_sb_t, sb_shared_vn), 0 },
{ offsetof(xfs_sb_t, sb_inoalignmt), 0 },
{ offsetof(xfs_sb_t, sb_unit), 0 },
{ offsetof(xfs_sb_t, sb_width), 0 },
{ offsetof(xfs_sb_t, sb_dirblklog), 0 },
{ offsetof(xfs_sb_t, sb_dummy), 1 },
{ offsetof(xfs_sb_t, sb_logsunit), 0 },
{ sizeof(xfs_sb_t), 0 }
};
/*
* Return a pointer to an initialized xfs_mount structure.
*/
xfs_mount_t *
xfs_mount_init(void)
{
xfs_mount_t *mp;
mp = kmem_zalloc(sizeof(*mp), KM_SLEEP);
AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
spinlock_init(&mp->m_sb_lock, "xfs_sb");
mutex_init(&mp->m_ilock, MUTEX_DEFAULT, "xfs_ilock");
initnsema(&mp->m_growlock, 1, "xfs_grow");
/*
* Initialize the AIL.
*/
xfs_trans_ail_init(mp);
/* Init freeze sync structures */
spinlock_init(&mp->m_freeze_lock, "xfs_freeze");
init_sv(&mp->m_wait_unfreeze, SV_DEFAULT, "xfs_freeze", 0);
atomic_set(&mp->m_active_trans, 0);
return mp;
} /* xfs_mount_init */
/*
* Free up the resources associated with a mount structure. Assume that
* the structure was initially zeroed, so we can tell which fields got
* initialized.
*/
void
xfs_mount_free(
xfs_mount_t *mp,
int remove_bhv)
{
if (mp->m_ihash)
xfs_ihash_free(mp);
if (mp->m_chash)
xfs_chash_free(mp);
if (mp->m_perag) {
int agno;
for (agno = 0; agno < mp->m_maxagi; agno++)
if (mp->m_perag[agno].pagb_list)
kmem_free(mp->m_perag[agno].pagb_list,
sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
kmem_free(mp->m_perag,
sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
}
#if 0
/*
* XXXdpd - Doesn't work now for shutdown case.
* Should at least free the memory.
*/
ASSERT(mp->m_ail.ail_back == (xfs_log_item_t*)&(mp->m_ail));
ASSERT(mp->m_ail.ail_forw == (xfs_log_item_t*)&(mp->m_ail));
#endif
AIL_LOCK_DESTROY(&mp->m_ail_lock);
spinlock_destroy(&mp->m_sb_lock);
mutex_destroy(&mp->m_ilock);
freesema(&mp->m_growlock);
if (mp->m_fsname != NULL) {
kmem_free(mp->m_fsname, mp->m_fsname_len);
}
if (mp->m_quotainfo != NULL) {
xfs_qm_unmount_quotadestroy(mp);
}
if (remove_bhv) {
VFS_REMOVEBHV(XFS_MTOVFS(mp), &mp->m_bhv);
}
spinlock_destroy(&mp->m_freeze_lock);
sv_destroy(&mp->m_wait_unfreeze);
kmem_free(mp, sizeof(xfs_mount_t));
}
/*
* Check the validity of the SB found.
*/
STATIC int
xfs_mount_validate_sb(
xfs_mount_t *mp,
xfs_sb_t *sbp)
{
/*
* If the log device and data device have the
* same device number, the log is internal.
* Consequently, the sb_logstart should be non-zero. If
* we have a zero sb_logstart in this case, we may be trying to mount
* a volume filesystem in a non-volume manner.
*/
if (sbp->sb_magicnum != XFS_SB_MAGIC) {
cmn_err(CE_WARN, "XFS: bad magic number");
return XFS_ERROR(EWRONGFS);
}
if (!XFS_SB_GOOD_VERSION(sbp)) {
cmn_err(CE_WARN, "XFS: bad version");
return XFS_ERROR(EWRONGFS);
}
if (sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp) {
cmn_err(CE_WARN, "XFS: filesystem is marked as having an external log; specify logdev on the\nmount command line.");
return XFS_ERROR(EFSCORRUPTED);
}
if (sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp) {
cmn_err(CE_WARN, "XFS: filesystem is marked as having an internal log; don't specify logdev on\nthe mount command line.");
return XFS_ERROR(EFSCORRUPTED);
}
/*
* More sanity checking. These were stolen directly from
* xfs_repair.
*/
if (sbp->sb_blocksize <= 0 ||
sbp->sb_agcount <= 0 ||
sbp->sb_sectsize <= 0 ||
sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG ||
sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG ||
sbp->sb_inodesize < XFS_DINODE_MIN_SIZE ||
sbp->sb_inodesize > XFS_DINODE_MAX_SIZE ||
(sbp->sb_rextsize * sbp->sb_blocksize > XFS_MAX_RTEXTSIZE) ||
(sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) ||
sbp->sb_imax_pct > 100) {
cmn_err(CE_WARN, "XFS: SB sanity check 1 failed");
return XFS_ERROR(EFSCORRUPTED);
}
/*
* sanity check ag count, size fields against data size field
*/
if (sbp->sb_dblocks == 0 ||
sbp->sb_dblocks >
(xfs_drfsbno_t)sbp->sb_agcount * sbp->sb_agblocks ||
sbp->sb_dblocks < (xfs_drfsbno_t)(sbp->sb_agcount - 1) *
sbp->sb_agblocks + XFS_MIN_AG_BLOCKS) {
cmn_err(CE_WARN, "XFS: SB sanity check 2 failed");
return XFS_ERROR(EFSCORRUPTED);
}
#if !XFS_BIG_FILESYSTEMS
if (sbp->sb_dblocks > INT_MAX || sbp->sb_rblocks > INT_MAX) {
cmn_err(CE_WARN,
"XFS: File systems greater than 1TB not supported on this system.");
return XFS_ERROR(E2BIG);
}
#endif
if (sbp->sb_inprogress) {
cmn_err(CE_WARN, "XFS: file system busy");
return XFS_ERROR(EFSCORRUPTED);
}
/*
* Until this is fixed only page-sized or smaller data blocks work.
*/
if (sbp->sb_blocksize > PAGE_SIZE) {
cmn_err(CE_WARN,
"XFS: Trying to mount file system with blocksize %d bytes",
sbp->sb_blocksize);
cmn_err(CE_WARN,
"XFS: Only page-sized (%d bytes) or less blocksizes currently work.",
PAGE_SIZE);
return XFS_ERROR(EWRONGFS);
}
return (0);
}
void
xfs_initialize_perag(xfs_mount_t *mp, int agcount)
{
int index, max_metadata;
xfs_perag_t *pag;
xfs_agino_t agino;
xfs_ino_t ino;
xfs_sb_t *sbp = &mp->m_sb;
xfs_ino_t max_inum = XFS_MAXINUMBER_32;
/* Check to see if the filesystem can overflow 32 bit inodes */
agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
/* Clear the mount flag if no inode can overflow 32 bits
* on this filesystem.
*/
if (ino <= max_inum) {
mp->m_flags &= ~XFS_MOUNT_32BITINODES;
}
/* If we can overflow then setup the ag headers accordingly */
if (mp->m_flags & XFS_MOUNT_32BITINODES) {
/* Calculate how much should be reserved for inodes to
* meet the max inode percentage.
*/
if (mp->m_maxicount) {
__uint64_t icount;
icount = sbp->sb_dblocks * sbp->sb_imax_pct;
do_div(icount, 100);
icount += sbp->sb_agblocks - 1;
do_div(icount, mp->m_ialloc_blks);
max_metadata = icount;
} else {
max_metadata = agcount;
}
for (index = 0; index < agcount; index++) {
ino = XFS_AGINO_TO_INO(mp, index, agino);
if (ino > max_inum) {
index++;
break;
}
/* This ag is prefered for inodes */
pag = &mp->m_perag[index];
pag->pagi_inodeok = 1;
if (index < max_metadata)
pag->pagf_metadata = 1;
}
} else {
/* Setup default behavior for smaller filesystems */
for (index = 0; index < agcount; index++) {
pag = &mp->m_perag[index];
pag->pagi_inodeok = 1;
}
}
mp->m_maxagi = index;
}
/*
* xfs_xlatesb
*
* data - on disk version of sb
* sb - a superblock
* dir - conversion direction: <0 - convert sb to buf
* >0 - convert buf to sb
* arch - architecture to read/write from/to buf
* fields - which fields to copy (bitmask)
*/
void
xfs_xlatesb(
void *data,
xfs_sb_t *sb,
int dir,
xfs_arch_t arch,
__int64_t fields)
{
xfs_caddr_t buf_ptr;
xfs_caddr_t mem_ptr;
xfs_sb_field_t f;
int first;
int size;
ASSERT(dir);
ASSERT(fields);
if (!fields)
return;
buf_ptr = (xfs_caddr_t)data;
mem_ptr = (xfs_caddr_t)sb;
while (fields) {
f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
first = xfs_sb_info[f].offset;
size = xfs_sb_info[f + 1].offset - first;
ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1);
if (arch == ARCH_NOCONVERT ||
size == 1 ||
xfs_sb_info[f].type == 1) {
if (dir > 0) {
memcpy(mem_ptr + first, buf_ptr + first, size);
} else {
memcpy(buf_ptr + first, mem_ptr + first, size);
}
} else {
switch (size) {
case 2:
INT_XLATE(*(__uint16_t*)(buf_ptr+first),
*(__uint16_t*)(mem_ptr+first),
dir, arch);
break;
case 4:
INT_XLATE(*(__uint32_t*)(buf_ptr+first),
*(__uint32_t*)(mem_ptr+first),
dir, arch);
break;
case 8:
INT_XLATE(*(__uint64_t*)(buf_ptr+first),
*(__uint64_t*)(mem_ptr+first), dir, arch);
break;
default:
ASSERT(0);
}
}
fields &= ~(1LL << f);
}
}
/*
* xfs_readsb
*
* Does the initial read of the superblock.
*/
int
xfs_readsb(xfs_mount_t *mp)
{
xfs_buf_t *bp;
xfs_sb_t *sbp;
int error = 0;
ASSERT(mp->m_sb_bp == 0);
/*
* Allocate a (locked) buffer to hold the superblock.
* This will be kept around at all time to optimize
* access to the superblock.
*/
bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR, 1,
PBF_LOCK|PBF_READ|PBF_MAPPED|PBF_MAPPABLE|PBF_FS_MANAGED);
ASSERT(bp != NULL);
ASSERT(XFS_BUF_ISBUSY(bp) && XFS_BUF_VALUSEMA(bp) <= 0);
/*
* Initialize the mount structure from the superblock.
* But first do some basic consistency checking.
*/
sbp = XFS_BUF_TO_SBP(bp);
xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), 1, ARCH_CONVERT, XFS_SB_ALL_BITS);
if ((error = xfs_mount_validate_sb(mp, &(mp->m_sb)))) {
cmn_err(CE_WARN, "XFS: SB validate failed");
goto err;
}
mp->m_sb_bp = bp;
xfs_buf_relse(bp);
ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
return 0;
err:
bp->pb_flags &= ~PBF_FS_MANAGED;
xfs_buf_relse(bp);
return error;
}
/*
* xfs_mount_common
*
* Mount initialization code establishing various mount
* fields from the superblock associated with the given
* mount structure
*/
void
xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
{
int i;
mp->m_agfrotor = mp->m_agirotor = 0;
mp->m_maxagi = mp->m_sb.sb_agcount;
mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG;
mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT;
mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1;
mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog;
mp->m_litino = sbp->sb_inodesize -
((uint)sizeof(xfs_dinode_core_t) + (uint)sizeof(xfs_agino_t));
mp->m_blockmask = sbp->sb_blocksize - 1;
mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
mp->m_blockwmask = mp->m_blockwsize - 1;
if (XFS_SB_VERSION_HASLOGV2(sbp)) {
if (sbp->sb_logsunit <= 1) {
mp->m_lstripemask = 1;
} else {
mp->m_lstripemask =
1 << xfs_highbit32(sbp->sb_logsunit >> BBSHIFT);
}
}
/*
* Setup for attributes, in case they get created.
* This value is for inodes getting attributes for the first time,
* the per-inode value is for old attribute values.
*/
ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
switch (sbp->sb_inodesize) {
case 256:
mp->m_attroffset = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(2);
break;
case 512:
case 1024:
case 2048:
mp->m_attroffset = XFS_BMDR_SPACE_CALC(12);
break;
default:
ASSERT(0);
}
ASSERT(mp->m_attroffset < XFS_LITINO(mp));
for (i = 0; i < 2; i++) {
mp->m_alloc_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
xfs_alloc, i == 0);
mp->m_alloc_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
xfs_alloc, i == 0);
}
for (i = 0; i < 2; i++) {
mp->m_bmap_dmxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
xfs_bmbt, i == 0);
mp->m_bmap_dmnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
xfs_bmbt, i == 0);
}
for (i = 0; i < 2; i++) {
mp->m_inobt_mxr[i] = XFS_BTREE_BLOCK_MAXRECS(sbp->sb_blocksize,
xfs_inobt, i == 0);
mp->m_inobt_mnr[i] = XFS_BTREE_BLOCK_MINRECS(sbp->sb_blocksize,
xfs_inobt, i == 0);
}
mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK,
sbp->sb_inopblock);
mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
}
extern void xfs_refcache_sbdirty(struct super_block*);
/*
* xfs_mountfs
*
* This function does the following on an initial mount of a file system:
* - reads the superblock from disk and init the mount struct
* - if we're a 32-bit kernel, do a size check on the superblock
* so we don't mount terabyte filesystems
* - init mount struct realtime fields
* - allocate inode hash table for fs
* - init directory manager
* - perform recovery and init the log manager
*/
int
xfs_mountfs(
vfs_t *vfsp,
xfs_mount_t *mp,
dev_t dev,
int mfsi_flags)
{
xfs_buf_t *bp;
xfs_sb_t *sbp = &(mp->m_sb);
int error = 0;
xfs_inode_t *rip;
vnode_t *rvp = 0;
int readio_log;
int writeio_log;
vmap_t vmap;
xfs_daddr_t d;
extern xfs_ioops_t xfs_iocore_xfs; /* from xfs_iocore.c */
__uint64_t ret64;
uint quotaflags, quotaondisk, rootqcheck, needquotacheck;
boolean_t needquotamount;
__int64_t update_flags;
int agno, noio;
int uuid_mounted = 0;
noio = dev == 0 && mp->m_sb_bp != NULL;
if (mp->m_sb_bp == NULL) {
if ((error = xfs_readsb(mp))) {
return (error);
}
}
xfs_mount_common(mp, sbp);
/*
* Check if sb_agblocks is aligned at stripe boundary
* If sb_agblocks is NOT aligned turn off m_dalign since
* allocator alignment is within an ag, therefore ag has
* to be aligned at stripe boundary.
*/
update_flags = 0LL;
if (mp->m_dalign && !(mfsi_flags & XFS_MFSI_SECOND)) {
/*
* If stripe unit and stripe width are not multiples
* of the fs blocksize turn off alignment.
*/
if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
(BBTOB(mp->m_swidth) & mp->m_blockmask)) {
if (mp->m_flags & XFS_MOUNT_RETERR) {
cmn_err(CE_WARN, "XFS: alignment check 1 failed");
error = XFS_ERROR(EINVAL);
goto error1;
}
mp->m_dalign = mp->m_swidth = 0;
} else {
/*
* Convert the stripe unit and width to FSBs.
*/
mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
if (mp->m_flags & XFS_MOUNT_RETERR) {
error = XFS_ERROR(EINVAL);
goto error1;
}
mp->m_dalign = 0;
mp->m_swidth = 0;
} else if (mp->m_dalign) {
mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
} else {
if (mp->m_flags & XFS_MOUNT_RETERR) {
cmn_err(CE_WARN, "XFS: alignment check 3 failed");
error = XFS_ERROR(EINVAL);
goto error1;
}
mp->m_swidth = 0;
}
}
/*
* Update superblock with new values
* and log changes
*/
if (XFS_SB_VERSION_HASDALIGN(sbp)) {
if (sbp->sb_unit != mp->m_dalign) {
sbp->sb_unit = mp->m_dalign;
update_flags |= XFS_SB_UNIT;
}
if (sbp->sb_width != mp->m_swidth) {
sbp->sb_width = mp->m_swidth;
update_flags |= XFS_SB_WIDTH;
}
}
} else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
mp->m_dalign = sbp->sb_unit;
mp->m_swidth = sbp->sb_width;
}
xfs_alloc_compute_maxlevels(mp);
xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
xfs_ialloc_compute_maxlevels(mp);
if (sbp->sb_imax_pct) {
__uint64_t icount;
/* Make sure the maximum inode count is a multiple of the
* units we allocate inodes in.
*/
icount = sbp->sb_dblocks * sbp->sb_imax_pct;
do_div(icount, 100);
do_div(icount, mp->m_ialloc_blks);
mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
sbp->sb_inopblog;
} else
mp->m_maxicount = 0;
/*
* XFS uses the uuid from the superblock as the unique
* identifier for fsid. We can not use the uuid from the volume
* since a single partition filesystem is identical to a single
* partition volume/filesystem.
*/
if ((mfsi_flags & XFS_MFSI_SECOND) == 0 && (mp->m_flags & XFS_MOUNT_NOUUID) == 0) {
if (xfs_uuid_mount(mp)) {
error = XFS_ERROR(EINVAL);
goto error1;
}
uuid_mounted=1;
ret64 = uuid_hash64(&sbp->sb_uuid);
memcpy(&vfsp->vfs_fsid, &ret64, sizeof(ret64));
}
/*
* Set the default minimum read and write sizes unless
* already specified in a mount option.
* We use smaller I/O sizes when the file system
* is being used for NFS service (wsync mount option).
*/
if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
if (mp->m_flags & XFS_MOUNT_WSYNC) {
readio_log = XFS_WSYNC_READIO_LOG;
writeio_log = XFS_WSYNC_WRITEIO_LOG;
} else {
readio_log = XFS_READIO_LOG_LARGE;
writeio_log = XFS_WRITEIO_LOG_LARGE;
}
} else {
readio_log = mp->m_readio_log;
writeio_log = mp->m_writeio_log;
}
/*
* Set the number of readahead buffers to use based on
* physical memory size.
*/
if (xfs_physmem <= 4096) /* <= 16MB */
mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
else if (xfs_physmem <= 8192) /* <= 32MB */
mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
else
mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
if (sbp->sb_blocklog > readio_log) {
mp->m_readio_log = sbp->sb_blocklog;
} else {
mp->m_readio_log = readio_log;
}
mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog);
if (sbp->sb_blocklog > writeio_log) {
mp->m_writeio_log = sbp->sb_blocklog;
} else {
mp->m_writeio_log = writeio_log;
}
mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog);
/*
* Set the inode cluster size based on the physical memory
* size. This may still be overridden by the file system
* block size if it is larger than the chosen cluster size.
*/
if (xfs_physmem <= btoc(32 * 1024 * 1024)) { /* <= 32 MB */
mp->m_inode_cluster_size = XFS_INODE_SMALL_CLUSTER_SIZE;
} else {
mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
}
/*
* Set whether we're using inode alignment.
*/
if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
mp->m_sb.sb_inoalignmt >=
XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
else
mp->m_inoalign_mask = 0;
/*
* If we are using stripe alignment, check whether
* the stripe unit is a multiple of the inode alignment
*/
if (mp->m_dalign && mp->m_inoalign_mask &&
!(mp->m_dalign & mp->m_inoalign_mask))
mp->m_sinoalign = mp->m_dalign;
else
mp->m_sinoalign = 0;
/*
* Check that the data (and log if separate) are an ok size.
*/
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
cmn_err(CE_WARN, "XFS: size check 1 failed");
error = XFS_ERROR(E2BIG);
goto error1;
}
if (!noio) {
error = xfs_read_buf(mp, mp->m_ddev_targp, d - 1, 1, 0, &bp);
if (!error) {
xfs_buf_relse(bp);
} else {
cmn_err(CE_WARN, "XFS: size check 2 failed");
if (error == ENOSPC) {
error = XFS_ERROR(E2BIG);
}
goto error1;
}
}
if (!noio && ((mfsi_flags & XFS_MFSI_CLIENT) == 0) &&
mp->m_logdev_targp != mp->m_ddev_targp) {
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
cmn_err(CE_WARN, "XFS: size check 3 failed");
error = XFS_ERROR(E2BIG);
goto error1;
}
error = xfs_read_buf(mp, mp->m_logdev_targp, d - 1, 1, 0, &bp);
if (!error) {
xfs_buf_relse(bp);
} else {
cmn_err(CE_WARN, "XFS: size check 3 failed");
if (error == ENOSPC) {
error = XFS_ERROR(E2BIG);
}
goto error1;
}
}
/*
* Initialize realtime fields in the mount structure
*/
if ((error = xfs_rtmount_init(mp))) {
cmn_err(CE_WARN, "XFS: RT mount failed");
goto error1;
}
/*
* For client case we are done now
*/
if (mfsi_flags & XFS_MFSI_CLIENT) {
return(0);
}
/*
* Set up timer list structure for nfs refcache
*/
init_timer(&mp->m_sbdirty_timer);
mp->m_sbdirty_timer.function = (void (*)(unsigned long)) xfs_refcache_sbdirty;
/* Initialize the I/O function vector with XFS functions */
mp->m_io_ops = xfs_iocore_xfs;
/*
* Copies the low order bits of the timestamp and the randomly
* set "sequence" number out of a UUID.
*/
uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid);
/*
* The vfs structure needs to have a file system independent
* way of checking for the invariant file system ID. Since it
* can't look at mount structures it has a pointer to the data
* in the mount structure.
*
* File systems that don't support user level file handles (i.e.
* all of them except for XFS) will leave vfs_altfsid as NULL.
*/
vfsp->vfs_altfsid = (fsid_t *)mp->m_fixedfsid;
mp->m_dmevmask = 0; /* not persistent; set after each mount */
/*
* Select the right directory manager.
*/
mp->m_dirops =
XFS_SB_VERSION_HASDIRV2(&mp->m_sb) ?
xfsv2_dirops :
xfsv1_dirops;
/*
* Initialize directory manager's entries.
*/
XFS_DIR_MOUNT(mp);
/*
* Initialize the attribute manager's entries.
*/
mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;
/*
* Initialize the precomputed transaction reservations values.
*/
xfs_trans_init(mp);
if (noio) {
ASSERT((mfsi_flags & XFS_MFSI_CLIENT) == 0);
return 0;
}
/*
* Allocate and initialize the inode hash table for this
* file system.
*/
xfs_ihash_init(mp);
xfs_chash_init(mp);
/*
* Allocate and initialize the per-ag data.
*/
init_rwsem(&mp->m_peraglock);
mp->m_perag =
kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
xfs_initialize_perag(mp, sbp->sb_agcount);
/*
* log's mount-time initialization. Perform 1st part recovery if needed
*/
if (sbp->sb_logblocks > 0) { /* check for volume case */
error = xfs_log_mount(mp, mp->m_logdev_targp->pbr_dev,
XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
if (error) {
cmn_err(CE_WARN, "XFS: log mount failed");
goto error2;
}
} else { /* No log has been defined */
cmn_err(CE_WARN, "XFS: no log defined");
error = XFS_ERROR(EFSCORRUPTED);
goto error2;
}
/*
* Get and sanity-check the root inode.
* Save the pointer to it in the mount structure.
*/
error = xfs_iget(mp, NULL, sbp->sb_rootino, XFS_ILOCK_EXCL, &rip, 0);
if (error) {
cmn_err(CE_WARN, "XFS: failed to read root inode");
goto error3;
}
ASSERT(rip != NULL);
rvp = XFS_ITOV(rip);
if ((rip->i_d.di_mode & IFMT) != IFDIR) {
cmn_err(CE_WARN, "XFS: corrupted root inode");
VMAP(rvp, vmap);
prdev("Root inode %llu is not a directory",
mp->m_dev, (unsigned long long)rip->i_ino);
rvp->v_flag |= VPURGE;
xfs_iunlock(rip, XFS_ILOCK_EXCL);
VN_RELE(rvp);
vn_purge(rvp, &vmap);
error = XFS_ERROR(EFSCORRUPTED);
goto error3;
}
mp->m_rootip = rip; /* save it */
xfs_iunlock(rip, XFS_ILOCK_EXCL);
quotaondisk = XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
mp->m_sb.sb_qflags & (XFS_UQUOTA_ACCT|XFS_GQUOTA_ACCT);
/*
* If the device itself is read-only, we can't allow
* the user to change the state of quota on the mount -
* this would generate a transaction on the ro device,
* which would lead to an I/O error and shutdown
*/
if (((quotaondisk && !XFS_IS_QUOTA_ON(mp)) ||
(!quotaondisk && XFS_IS_QUOTA_ON(mp))) &&
xfs_dev_is_read_only(mp, "changing quota state")) {
cmn_err(CE_WARN,
"XFS: device %s is read-only, cannot change "
"quota state. Please mount with%s quota option.",
mp->m_fsname, quotaondisk ? "" : "out");
rvp->v_flag |= VPURGE;
VN_RELE(rvp);
vn_remove(rvp);
error = XFS_ERROR(EPERM);
goto error3;
}
/*
* Initialize realtime inode pointers in the mount structure
*/
if ((error = xfs_rtmount_inodes(mp))) {
/*
* Free up the root inode.
*/
cmn_err(CE_WARN, "XFS: failed to read RT inodes");
rvp->v_flag |= VPURGE;
VMAP(rvp, vmap);
VN_RELE(rvp);
vn_purge(rvp, &vmap);
goto error3;
}
/*
* If fs is not mounted readonly, then update the superblock
* unit and width changes.
*/
if (update_flags && !(vfsp->vfs_flag & VFS_RDONLY))
xfs_mount_log_sbunit(mp, update_flags);
quotaflags = 0;
needquotamount = B_FALSE;
/*
* Figure out if we'll need to do a quotacheck.
* The requirements are a little different depending on whether
* this fs is root or not.
*/
rootqcheck = (mp->m_dev == rootdev && quotaondisk &&
((mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT &&
(mp->m_sb.sb_qflags & XFS_UQUOTA_CHKD) == 0) ||
(mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT &&
(mp->m_sb.sb_qflags & XFS_GQUOTA_CHKD) == 0)));
needquotacheck = rootqcheck || XFS_QM_NEED_QUOTACHECK(mp);
if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
/*
* Call mount_quotas at this point only if we won't have to do
* a quotacheck.
*/
if (quotaondisk && !needquotacheck) {
/*
* If the xfs quota code isn't installed,
* we have to reset the quotachk'd bit.
* If an error occured, qm_mount_quotas code
* has already disabled quotas. So, just finish
* mounting, and get on with the boring life
* without disk quotas.
*/
if (xfs_qm_mount_quotas(mp))
xfs_mount_reset_sbqflags(mp);
} else {
/*
* Clear the quota flags, but remember them. This
* is so that the quota code doesn't get invoked
* before we're ready. This can happen when an
* inode goes inactive and wants to free blocks,
* or via xfs_log_mount_finish.
*/
quotaflags = mp->m_qflags;
mp->m_qflags = 0;
needquotamount = B_TRUE;
}
}
/*
* Finish recovering the file system. This part needed to be
* delayed until after the root and real-time bitmap inodes
* were consistently read in.
*/
error = xfs_log_mount_finish(mp, mfsi_flags);
if (error) {
cmn_err(CE_WARN, "XFS: log mount finish failed");
goto error3;
}
if (needquotamount) {
ASSERT(mp->m_qflags == 0);
mp->m_qflags = quotaflags;
rootqcheck = (mp->m_dev == rootdev && needquotacheck);
if (rootqcheck && (error = xfs_dev_is_read_only(mp,
"quotacheck")))
goto error2;
if (xfs_qm_mount_quotas(mp))
xfs_mount_reset_sbqflags(mp);
}
#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
if (! (XFS_IS_QUOTA_ON(mp)))
xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
else
xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
#endif
#ifdef QUOTADEBUG
if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
#endif
return (0);
error3:
xfs_log_unmount_dealloc(mp);
error2:
xfs_ihash_free(mp);
xfs_chash_free(mp);
for (agno = 0; agno < sbp->sb_agcount; agno++)
if (mp->m_perag[agno].pagb_list)
kmem_free(mp->m_perag[agno].pagb_list,
sizeof(xfs_perag_busy_t) * XFS_PAGB_NUM_SLOTS);
kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
mp->m_perag = NULL;
/* FALLTHROUGH */
error1:
if (uuid_mounted)
xfs_uuid_unmount(mp);
xfs_freesb(mp);
return error;
}
/*
* xfs_unmountfs
*
* This flushes out the inodes,dquots and the superblock, unmounts the
* log and makes sure that incore structures are freed.
*/
int
xfs_unmountfs(xfs_mount_t *mp, struct cred *cr)
{
int ndquots;
#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
int64_t fsid;
#endif
xfs_iflush_all(mp, XFS_FLUSH_ALL);
/*
* Purge the dquot cache.
* None of the dquots should really be busy at this point.
*/
if (mp->m_quotainfo) {
while ((ndquots = xfs_qm_dqpurge_all(mp,
XFS_QMOPT_UQUOTA|
XFS_QMOPT_GQUOTA|
XFS_QMOPT_UMOUNTING))) {
delay(ndquots * 10);
}
}
/*
* Flush out the log synchronously so that we know for sure
* that nothing is pinned. This is important because bflush()
* will skip pinned buffers.
*/
xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
xfs_binval(mp->m_ddev_targp);
if (mp->m_rtdev_targp) {
xfs_binval(mp->m_rtdev_targp);
}
xfs_unmountfs_writesb(mp);
xfs_log_unmount(mp); /* Done! No more fs ops. */
xfs_freesb(mp);
/*
* All inodes from this mount point should be freed.
*/
ASSERT(mp->m_inodes == NULL);
/*
* We may have bufs that are in the process of getting written still.
* We must wait for the I/O completion of those. The sync flag here
* does a two pass iteration thru the bufcache.
*/
if (XFS_FORCED_SHUTDOWN(mp)) {
xfs_incore_relse(mp->m_ddev_targp, 0, 1); /* synchronous */
}
xfs_unmountfs_close(mp, cr);
if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
xfs_uuid_unmount(mp);
#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
/*
* clear all error tags on this filesystem
*/
memcpy(&fsid, &(XFS_MTOVFS(mp)->vfs_fsid), sizeof(int64_t));
(void) xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
#endif
xfs_mount_free(mp, 1);
return 0;
}
void
xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
{
int have_logdev = (mp->m_logdev_targp != mp->m_ddev_targp);
if (mp->m_ddev_targp) {
xfs_free_buftarg(mp->m_ddev_targp);
mp->m_ddev_targp = NULL;
}
if (mp->m_rtdev_targp) {
xfs_blkdev_put(mp->m_rtdev_targp->pbr_bdev);
xfs_free_buftarg(mp->m_rtdev_targp);
mp->m_rtdev_targp = NULL;
}
if (mp->m_logdev_targp && have_logdev) {
xfs_blkdev_put(mp->m_logdev_targp->pbr_bdev);
xfs_free_buftarg(mp->m_logdev_targp);
mp->m_logdev_targp = NULL;
}
}
int
xfs_unmountfs_writesb(xfs_mount_t *mp)
{
xfs_buf_t *sbp;
xfs_sb_t *sb;
int error = 0;
/*
* skip superblock write if fs is read-only, or
* if we are doing a forced umount.
*/
sbp = xfs_getsb(mp, 0);
if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
XFS_FORCED_SHUTDOWN(mp))) {
/*
* mark shared-readonly if desired
*/
sb = XFS_BUF_TO_SBP(sbp);
if (mp->m_mk_sharedro) {
if (!(sb->sb_flags & XFS_SBF_READONLY))
sb->sb_flags |= XFS_SBF_READONLY;
if (!XFS_SB_VERSION_HASSHARED(sb))
XFS_SB_VERSION_ADDSHARED(sb);
xfs_fs_cmn_err(CE_NOTE, mp,
"Unmounting, marking shared read-only");
}
XFS_BUF_UNDONE(sbp);
XFS_BUF_UNREAD(sbp);
XFS_BUF_UNDELAYWRITE(sbp);
XFS_BUF_WRITE(sbp);
XFS_BUF_UNASYNC(sbp);
ASSERT(XFS_BUF_TARGET_DEV(sbp) == mp->m_dev);
xfsbdstrat(mp, sbp);
/* Nevermind errors we might get here. */
error = xfs_iowait(sbp);
if (error)
xfs_ioerror_alert("xfs_unmountfs_writesb",
mp, sbp, XFS_BUF_ADDR(sbp));
if (error && mp->m_mk_sharedro)
xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error detected while unmounting. Filesystem may not be marked shared readonly");
}
xfs_buf_relse(sbp);
return (error);
}
/*
* xfs_mod_sb() can be used to copy arbitrary changes to the
* in-core superblock into the superblock buffer to be logged.
* It does not provide the higher level of locking that is
* needed to protect the in-core superblock from concurrent
* access.
*/
void
xfs_mod_sb(xfs_trans_t *tp, __int64_t fields)
{
xfs_buf_t *bp;
int first;
int last;
xfs_mount_t *mp;
xfs_sb_t *sbp;
xfs_sb_field_t f;
ASSERT(fields);
if (!fields)
return;
mp = tp->t_mountp;
bp = xfs_trans_getsb(tp, mp, 0);
sbp = XFS_BUF_TO_SBP(bp);
first = sizeof(xfs_sb_t);
last = 0;
/* translate/copy */
xfs_xlatesb(XFS_BUF_PTR(bp), &(mp->m_sb), -1, ARCH_CONVERT, fields);
/* find modified range */
f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
ASSERT((1LL << f) & XFS_SB_MOD_BITS);
first = xfs_sb_info[f].offset;
f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields);
ASSERT((1LL << f) & XFS_SB_MOD_BITS);
last = xfs_sb_info[f + 1].offset - 1;
xfs_trans_log_buf(tp, bp, first, last);
}
/*
* xfs_mod_incore_sb_unlocked() is a utility routine common used to apply
* a delta to a specified field in the in-core superblock. Simply
* switch on the field indicated and apply the delta to that field.
* Fields are not allowed to dip below zero, so if the delta would
* do this do not apply it and return EINVAL.
*
* The SB_LOCK must be held when this routine is called.
*/
STATIC int
xfs_mod_incore_sb_unlocked(xfs_mount_t *mp, xfs_sb_field_t field,
int delta, int rsvd)
{
int scounter; /* short counter for 32 bit fields */
long long lcounter; /* long counter for 64 bit fields */
long long res_used, rem;
/*
* With the in-core superblock spin lock held, switch
* on the indicated field. Apply the delta to the
* proper field. If the fields value would dip below
* 0, then do not apply the delta and return EINVAL.
*/
switch (field) {
case XFS_SBS_ICOUNT:
lcounter = (long long)mp->m_sb.sb_icount;
lcounter += delta;
if (lcounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_icount = lcounter;
return (0);
case XFS_SBS_IFREE:
lcounter = (long long)mp->m_sb.sb_ifree;
lcounter += delta;
if (lcounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_ifree = lcounter;
return (0);
case XFS_SBS_FDBLOCKS:
lcounter = (long long)mp->m_sb.sb_fdblocks;
res_used = (long long)(mp->m_resblks - mp->m_resblks_avail);
if (delta > 0) { /* Putting blocks back */
if (res_used > delta) {
mp->m_resblks_avail += delta;
} else {
rem = delta - res_used;
mp->m_resblks_avail = mp->m_resblks;
lcounter += rem;
}
} else { /* Taking blocks away */
lcounter += delta;
/*
* If were out of blocks, use any available reserved blocks if
* were allowed to.
*/
if (lcounter < 0) {
if (rsvd) {
lcounter = (long long)mp->m_resblks_avail + delta;
if (lcounter < 0) {
return (XFS_ERROR(ENOSPC));
}
mp->m_resblks_avail = lcounter;
return (0);
} else { /* not reserved */
return (XFS_ERROR(ENOSPC));
}
}
}
mp->m_sb.sb_fdblocks = lcounter;
return (0);
case XFS_SBS_FREXTENTS:
lcounter = (long long)mp->m_sb.sb_frextents;
lcounter += delta;
if (lcounter < 0) {
return (XFS_ERROR(ENOSPC));
}
mp->m_sb.sb_frextents = lcounter;
return (0);
case XFS_SBS_DBLOCKS:
lcounter = (long long)mp->m_sb.sb_dblocks;
lcounter += delta;
if (lcounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_dblocks = lcounter;
return (0);
case XFS_SBS_AGCOUNT:
scounter = mp->m_sb.sb_agcount;
scounter += delta;
if (scounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_agcount = scounter;
return (0);
case XFS_SBS_IMAX_PCT:
scounter = mp->m_sb.sb_imax_pct;
scounter += delta;
if (scounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_imax_pct = scounter;
return (0);
case XFS_SBS_REXTSIZE:
scounter = mp->m_sb.sb_rextsize;
scounter += delta;
if (scounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_rextsize = scounter;
return (0);
case XFS_SBS_RBMBLOCKS:
scounter = mp->m_sb.sb_rbmblocks;
scounter += delta;
if (scounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_rbmblocks = scounter;
return (0);
case XFS_SBS_RBLOCKS:
lcounter = (long long)mp->m_sb.sb_rblocks;
lcounter += delta;
if (lcounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_rblocks = lcounter;
return (0);
case XFS_SBS_REXTENTS:
lcounter = (long long)mp->m_sb.sb_rextents;
lcounter += delta;
if (lcounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_rextents = lcounter;
return (0);
case XFS_SBS_REXTSLOG:
scounter = mp->m_sb.sb_rextslog;
scounter += delta;
if (scounter < 0) {
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
mp->m_sb.sb_rextslog = scounter;
return (0);
default:
ASSERT(0);
return (XFS_ERROR(EINVAL));
}
}
/*
* xfs_mod_incore_sb() is used to change a field in the in-core
* superblock structure by the specified delta. This modification
* is protected by the SB_LOCK. Just use the xfs_mod_incore_sb_unlocked()
* routine to do the work.
*/
int
xfs_mod_incore_sb(xfs_mount_t *mp, xfs_sb_field_t field, int delta, int rsvd)
{
unsigned long s;
int status;
s = XFS_SB_LOCK(mp);
status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
XFS_SB_UNLOCK(mp, s);
return (status);
}
/*
* xfs_mod_incore_sb_batch() is used to change more than one field
* in the in-core superblock structure at a time. This modification
* is protected by a lock internal to this module. The fields and
* changes to those fields are specified in the array of xfs_mod_sb
* structures passed in.
*
* Either all of the specified deltas will be applied or none of
* them will. If any modified field dips below 0, then all modifications
* will be backed out and EINVAL will be returned.
*/
int
xfs_mod_incore_sb_batch(xfs_mount_t *mp, xfs_mod_sb_t *msb, uint nmsb, int rsvd)
{
unsigned long s;
int status=0;
xfs_mod_sb_t *msbp;
/*
* Loop through the array of mod structures and apply each
* individually. If any fail, then back out all those
* which have already been applied. Do all of this within
* the scope of the SB_LOCK so that all of the changes will
* be atomic.
*/
s = XFS_SB_LOCK(mp);
msbp = &msb[0];
for (msbp = &msbp[0]; msbp < (msb + nmsb); msbp++) {
/*
* Apply the delta at index n. If it fails, break
* from the loop so we'll fall into the undo loop
* below.
*/
status = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
msbp->msb_delta, rsvd);
if (status != 0) {
break;
}
}
/*
* If we didn't complete the loop above, then back out
* any changes made to the superblock. If you add code
* between the loop above and here, make sure that you
* preserve the value of status. Loop back until
* we step below the beginning of the array. Make sure
* we don't touch anything back there.
*/
if (status != 0) {
msbp--;
while (msbp >= msb) {
status = xfs_mod_incore_sb_unlocked(mp,
msbp->msb_field, -(msbp->msb_delta), rsvd);
ASSERT(status == 0);
msbp--;
}
}
XFS_SB_UNLOCK(mp, s);
return (status);
}
/*
* xfs_getsb() is called to obtain the buffer for the superblock.
* The buffer is returned locked and read in from disk.
* The buffer should be released with a call to xfs_brelse().
*
* If the flags parameter is BUF_TRYLOCK, then we'll only return
* the superblock buffer if it can be locked without sleeping.
* If it can't then we'll return NULL.
*/
xfs_buf_t *
xfs_getsb(xfs_mount_t *mp,
int flags)
{
xfs_buf_t *bp;
ASSERT(mp->m_sb_bp != NULL);
bp = mp->m_sb_bp;
if (flags & XFS_BUF_TRYLOCK) {
if (!XFS_BUF_CPSEMA(bp)) {
return NULL;
}
} else {
XFS_BUF_PSEMA(bp, PRIBIO);
}
XFS_BUF_HOLD(bp);
ASSERT(XFS_BUF_ISDONE(bp));
return (bp);
}
/*
* Used to free the superblock along various error paths.
*/
void
xfs_freesb(
xfs_mount_t *mp)
{
xfs_buf_t *bp;
/*
* Use xfs_getsb() so that the buffer will be locked
* when we call nfreerbuf().
*/
bp = xfs_getsb(mp, 0);
bp->pb_flags &= ~PBF_FS_MANAGED;
xfs_buf_relse(bp);
mp->m_sb_bp = NULL;
}
/*
* See if the uuid is unique among mounted xfs filesystems.
* Mount fails if UUID is nil or a FS with the same UUID is already
* mounted
*/
STATIC int
xfs_uuid_mount(xfs_mount_t *mp)
{
int hole;
int i;
if (uuid_is_nil(&mp->m_sb.sb_uuid)) {
cmn_err(CE_WARN, "XFS: Filesystem %s has nil UUID - can't mount",
mp->m_fsname);
return -1;
}
mutex_lock(&xfs_uuidtabmon, PVFS);
for (i = 0, hole = -1; i < xfs_uuidtab_size; i++) {
if (uuid_is_nil(&xfs_uuidtab[i])) {
hole = i;
continue;
}
if (uuid_equal(&mp->m_sb.sb_uuid, &xfs_uuidtab[i])) {
cmn_err(CE_WARN, "XFS: Filesystem %s has duplicate UUID - can't mount",
mp->m_fsname);
mutex_unlock(&xfs_uuidtabmon);
return -1;
}
}
if (hole < 0) {
xfs_uuidtab = kmem_realloc(xfs_uuidtab,
(xfs_uuidtab_size + 1) * sizeof(*xfs_uuidtab),
xfs_uuidtab_size * sizeof(*xfs_uuidtab),
KM_SLEEP);
hole = xfs_uuidtab_size++;
}
xfs_uuidtab[hole] = mp->m_sb.sb_uuid;
mutex_unlock(&xfs_uuidtabmon);
return 0;
}
/*
* Remove filesystem from the uuid table.
*/
STATIC void
xfs_uuid_unmount(xfs_mount_t *mp)
{
int i;
mutex_lock(&xfs_uuidtabmon, PVFS);
for (i = 0; i < xfs_uuidtab_size; i++) {
if (uuid_is_nil(&xfs_uuidtab[i]))
continue;
if (!uuid_equal(&mp->m_sb.sb_uuid, &xfs_uuidtab[i]))
continue;
uuid_create_nil(&xfs_uuidtab[i]);
break;
}
ASSERT(i < xfs_uuidtab_size);
mutex_unlock(&xfs_uuidtabmon);
}
/*
* When xfsquotas isn't installed and the superblock had quotas, we need to
* clear the quotaflags from superblock.
*/
STATIC void
xfs_mount_reset_sbqflags(
xfs_mount_t *mp)
{
xfs_trans_t *tp;
unsigned long s;
mp->m_qflags = 0;
/*
* It is OK to look at sb_qflags here in mount path,
* without SB_LOCK.
*/
if (mp->m_sb.sb_qflags == 0)
return;
s = XFS_SB_LOCK(mp);
mp->m_sb.sb_qflags = 0;
XFS_SB_UNLOCK(mp, s);
/*
* if the fs is readonly, let the incore superblock run
* with quotas off but don't flush the update out to disk
*/
if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
return;
#ifdef QUOTADEBUG
xfs_fs_cmn_err(CE_NOTE, mp, "Writing superblock quota changes");
#endif
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
XFS_DEFAULT_LOG_COUNT)) {
xfs_trans_cancel(tp, 0);
return;
}
xfs_mod_sb(tp, XFS_SB_QFLAGS);
(void)xfs_trans_commit(tp, 0, NULL);
}
/*
* Used to log changes to the superblock unit and width fields which could
* be altered by the mount options. Only the first superblock is updated.
*/
STATIC void
xfs_mount_log_sbunit(
xfs_mount_t *mp,
__int64_t fields)
{
xfs_trans_t *tp;
ASSERT(fields & (XFS_SB_UNIT|XFS_SB_WIDTH|XFS_SB_UUID));
tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
if (xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
XFS_DEFAULT_LOG_COUNT)) {
xfs_trans_cancel(tp, 0);
return;
}
xfs_mod_sb(tp, fields);
(void)xfs_trans_commit(tp, 0, NULL);
}
/* Functions to lock access out of the filesystem for forced
* shutdown or snapshot.
*/
void
xfs_start_freeze(
xfs_mount_t *mp,
int level)
{
unsigned long s = mutex_spinlock(&mp->m_freeze_lock);
mp->m_frozen = level;
mutex_spinunlock(&mp->m_freeze_lock, s);
if (level == XFS_FREEZE_TRANS) {
while (atomic_read(&mp->m_active_trans) > 0)
delay(100);
}
}
void
xfs_finish_freeze(
xfs_mount_t *mp)
{
unsigned long s = mutex_spinlock(&mp->m_freeze_lock);
if (mp->m_frozen) {
mp->m_frozen = 0;
sv_broadcast(&mp->m_wait_unfreeze);
}
mutex_spinunlock(&mp->m_freeze_lock, s);
}
void
xfs_check_frozen(
xfs_mount_t *mp,
bhv_desc_t *bdp,
int level)
{
SPLDECL(s);
if (mp->m_frozen) {
s = mutex_spinlock(&mp->m_freeze_lock);
if (mp->m_frozen < level) {
mutex_spinunlock(&mp->m_freeze_lock, s);
} else {
sv_wait(&mp->m_wait_unfreeze, 0, &mp->m_freeze_lock, s);
}
}
if (level == XFS_FREEZE_TRANS)
atomic_inc(&mp->m_active_trans);
}
int
xfs_blkdev_get(
const char *name,
struct block_device **bdevp)
{
struct nameidata nd;
int error = 0;
if (path_init(name, LOOKUP_FOLLOW, &nd)) {
error = path_walk(name, &nd);
if (error) {
printk("XFS: Invalid device [%s], error=%d\n",
name, error);
return error;
}
}
/* I think we actually want bd_acquire here.. --hch */
*bdevp = bdget(kdev_t_to_nr(nd.dentry->d_inode->i_rdev));
if (*bdevp) {
error = blkdev_get(*bdevp, FMODE_READ|FMODE_WRITE, 0, BDEV_FS);
} else {
error = -ENOMEM;
}
path_release(&nd);
return -error;
}
void
xfs_blkdev_put(
struct block_device *bdev)
{
blkdev_put(bdev, BDEV_FS);
}
void
xfs_free_buftarg(
xfs_buftarg_t *btp)
{
pagebuf_delwri_flush(btp, PBDF_WAIT, NULL);
kfree(btp);
}
xfs_buftarg_t *
xfs_alloc_buftarg(
struct block_device *bdev)
{
xfs_buftarg_t *btp;
btp = kmem_zalloc(sizeof(*btp), KM_SLEEP);
btp->pbr_dev = bdev->bd_dev;
btp->pbr_kdev = to_kdev_t(btp->pbr_dev);
btp->pbr_bdev = bdev;
btp->pbr_mapping = bdev->bd_inode->i_mapping;
btp->pbr_blocksize = PAGE_CACHE_SIZE;
switch (MAJOR(btp->pbr_dev)) {
case MD_MAJOR:
case EVMS_MAJOR:
btp->pbr_flags = PBR_ALIGNED_ONLY;
break;
case LVM_BLK_MAJOR:
btp->pbr_flags = PBR_SECTOR_ONLY;
break;
}
return btp;
}
![[BACK]](/icons/back.gif){kind=icon}
Return to xfs_mount.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / xfs-linux-nodel