File: [Development] / xfs-linux / xfs_mount.c (download)
Revision 1.136, Tue Jun 18 21:16:49 1996 UTC (21 years, 3 months ago) by doucette
Branch: MAIN
Changes since 1.135: +2 -2
lines
Fix merge error where m_flags was not converted to m_qflags for the
quota mount case.
|
#ident "$Revision: 1.135 $"
#include <limits.h>
#ifdef SIM
#define _KERNEL 1
#endif /* SIM */
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/sysmacros.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/uuid.h>
#include <sys/grio.h>
#include <sys/debug.h>
#ifdef SIM
#undef _KERNEL
#endif /* SIM */
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/sema.h>
#include <sys/open.h>
#include <sys/cred.h>
#include <sys/cmn_err.h>
#ifdef SIM
#include <bstring.h>
#else
#include <sys/systm.h>
#include <sys/conf.h>
#endif /* SIM */
#include <stddef.h>
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_dir.h"
#include "xfs_alloc.h"
#include "xfs_rtalloc.h"
#include "xfs_bmap.h"
#include "xfs_error.h"
#include "xfs_bit.h"
#include "xfs_rw.h"
#include "xfs_quota.h"
#ifdef SIM
#include "sim.h"
#endif /* SIM */
STATIC int xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t, int);
STATIC void xfs_sb_relse(buf_t *);
#ifndef SIM
STATIC void xfs_uuid_mount(xfs_mount_t *);
STATIC void xfs_uuid_unmount(xfs_mount_t *);
mutex_t xfs_uuidtabmon; /* monitor for uuidtab */
STATIC int xfs_uuidtab_size;
STATIC uuid_t *xfs_uuidtab;
#endif /* !SIM */
/*
* 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), 0);
spinlock_init(&mp->m_ail_lock, "xfs_ail");
spinlock_init(&mp->m_ipinlock, "xfs_ipin");
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);
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)
{
if (mp->m_ihashmask)
xfs_ihash_free(mp);
if (mp->m_perag) {
mrfree(&mp->m_peraglock);
kmem_free(mp->m_perag,
sizeof(xfs_perag_t) * mp->m_sb.sb_agcount);
}
spinlock_destroy(&mp->m_ail_lock);
spinlock_destroy(&mp->m_ipinlock);
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);
}
VFS_REMOVEBHV(XFS_MTOVFS(mp), &mp->m_bhv);
kmem_free(mp, sizeof(xfs_mount_t));
} /* xfs_mount_free */
/*
* xfs_mountfs_int
*
* 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 an o32 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
*
* - if read_rootinos is set to 1 (typical case), the
* root inodes will be read in. The flag is set
* to 0 only in special cases when the filesystem
* is thought to be corrupt but we want a mount
* structure set up so we can use the XFS_* macros.
* If read_rootinos is 0, the superblock *must* be good.
* and the filesystem should be unmounted and remounted
* before any real xfs filesystem code can be run against
* the filesystem. This flag is used only by simulation
* code for fixing up the filesystem btrees.
*/
STATIC int
xfs_mountfs_int(vfs_t *vfsp, xfs_mount_t *mp, dev_t dev, int read_rootinos)
{
buf_t *bp;
xfs_sb_t *sbp;
int error = 0;
int i;
xfs_inode_t *rip;
vnode_t *rvp = 0;
vnode_t *rbmvp;
int readio_log;
int writeio_log;
vmap_t vmap;
__uint64_t ret64;
daddr_t d;
struct bdevsw *my_bdevsw;
uint quotaflags;
extern dev_t rootdev; /* from sys/systm.h */
if (vfsp->vfs_flag & VFS_REMOUNT) /* Can't remount XFS filesystems */
return 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 = ngetrbuf(BBTOB(BTOBB(sizeof(xfs_sb_t))));
ASSERT(bp != NULL);
ASSERT((bp->b_flags & B_BUSY) && valusema(&bp->b_lock) <= 0);
/*
* Initialize and read in the superblock buffer.
*/
bp->b_edev = dev;
bp->b_relse = xfs_sb_relse;
bp->b_blkno = XFS_SB_DADDR;
bp->b_flags |= B_READ;
my_bdevsw = get_bdevsw(dev);
ASSERT(my_bdevsw != NULL);
bdstrat(my_bdevsw, bp);
if (error = iowait(bp)) {
ASSERT(error == 0);
goto error0;
}
/*
* Initialize the mount structure from the superblock. 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.
*/
sbp = XFS_BUF_TO_SBP(bp);
if ((sbp->sb_magicnum != XFS_SB_MAGIC) ||
!XFS_SB_GOOD_VERSION(sbp) ||
(sbp->sb_logstart == 0 && mp->m_logdev == mp->m_dev)) {
error = XFS_ERROR(EINVAL);
goto error0;
}
#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.\n");
error = XFS_ERROR(E2BIG);
goto error0;
}
#endif
#ifndef SIM
/*
* Except for from mkfs, don't let partly-mkfs'ed filesystems mount.
*/
if (sbp->sb_inprogress) {
error = XFS_ERROR(EINVAL);
goto error0;
}
#endif
mp->m_sb_bp = bp;
mp->m_sb = *sbp; /* bcopy structure */
brelse(bp);
ASSERT(valusema(&bp->b_lock) > 0);
sbp = &(mp->m_sb);
mp->m_agfrotor = mp->m_agirotor = mp->m_rbmrotor = 0;
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 -
(sizeof(xfs_dinode_core_t) + 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;
/*
* 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);
}
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);
mp->m_bsize = XFS_FSB_TO_BB(mp, 1);
vfsp->vfs_bsize = XFS_FSB_TO_B(mp, 1);
mp->m_ialloc_inos = MAX(XFS_INODES_PER_CHUNK, sbp->sb_inopblock);
mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog;
if (sbp->sb_imax_pct)
mp->m_maxicount =
((sbp->sb_dblocks * sbp->sb_imax_pct) / 100) <<
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.
*/
#ifndef SIM
xfs_uuid_mount(mp); /* make sure it's really unique */
ret64 = uuid_hash64(&sbp->sb_uuid, (uint *)&i);
bcopy(&ret64, &vfsp->vfs_fsid, sizeof(ret64));
#endif
/*
* Set the default minimum read and write sizes.
* 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_WSYNC) {
readio_log = XFS_WSYNC_READIO_LOG;
writeio_log = XFS_WSYNC_WRITEIO_LOG;
} else {
#if !defined(SIM) && _MIPS_SIM != _ABI64
if (physmem <= 8192) { /* <= 32MB */
readio_log = XFS_READIO_LOG_SMALL;
writeio_log = XFS_WRITEIO_LOG_SMALL;
} else {
readio_log = XFS_READIO_LOG_LARGE;
writeio_log = XFS_WRITEIO_LOG_LARGE;
}
#else
readio_log = XFS_READIO_LOG_LARGE;
writeio_log = XFS_WRITEIO_LOG_LARGE;
#endif
}
#if !defined(SIM) && _MIPS_SIM != _ABI64
/*
* Set the number of readahead buffers to use based on
* physical memory size.
*/
if (physmem <= 4096) /* <= 16MB */
mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
else if (physmem <= 8192) /* <= 32MB */
mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
else
mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
#else
mp->m_nreadaheads = XFS_RW_NREADAHEAD_K64;
#endif
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 !defined(SIM) && _MIPS_SIM != _ABI64
if (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;
}
#else
mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
#endif
/*
* 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 = mp->m_sb.sb_inoalignmt;
else
mp->m_inoalign = 0;
/*
* Check that the data (and log if separate) are an ok size.
*/
d = (daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
error = XFS_ERROR(E2BIG);
goto error1;
}
bp = read_buf(mp->m_dev, d - 1, 1, 0);
ASSERT(bp);
error = geterror(bp);
brelse(bp);
if (error) {
if (error == ENOSPC) {
error = XFS_ERROR(E2BIG);
}
goto error1;
}
if (mp->m_logdev && mp->m_logdev != mp->m_dev) {
d = (daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
error = XFS_ERROR(E2BIG);
goto error1;
}
bp = read_buf(mp->m_logdev, d - 1, 1, 0);
ASSERT(bp);
error = geterror(bp);
brelse(bp);
if (error) {
if (error == ENOSPC) {
error = XFS_ERROR(E2BIG);
}
goto error1;
}
}
/*
* Initialize realtime fields in the mount structure
*/
if (sbp->sb_rblocks) {
mp->m_rsumlevels = sbp->sb_rextslog + 1;
mp->m_rsumsize = sizeof(xfs_suminfo_t) * mp->m_rsumlevels * sbp->sb_rbmblocks;
mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
mp->m_rbmip = mp->m_rsumip = NULL;
/*
* Check that the realtime section is an ok size.
*/
d = (daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
error = XFS_ERROR(E2BIG);
goto error1;
}
bp = read_buf(mp->m_rtdev, d - 1, 1, 0);
ASSERT(bp);
error = geterror(bp);
brelse(bp);
if (error) {
if (error == ENOSPC) {
error = XFS_ERROR(E2BIG);
}
goto error1;
}
}
/*
* 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 */
/*
* Allocate and initialize the inode hash table for this
* file system.
*/
xfs_ihash_init(mp);
/*
* Initialize the precomputed transaction reservations values.
*/
xfs_trans_init(mp);
/*
* Allocate and initialize the per-ag data.
*/
mrinit(&mp->m_peraglock, "xperag");
mp->m_perag =
kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t), KM_SLEEP);
/*
* 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,
XFS_FSB_TO_DADDR(mp, sbp->sb_logstart),
XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
if (error) {
goto error2;
}
} else { /* No log has been defined */
error = XFS_ERROR(EINVAL);
goto error2;
}
#ifdef SIM
/*
* Mkfs calls mount before the root inode is allocated.
*/
if (read_rootinos == 1 && sbp->sb_rootino != NULLFSINO)
#endif /* SIM */
{
/*
* 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) {
goto error2;
}
ASSERT(rip != NULL);
rvp = XFS_ITOV(rip);
if ((rip->i_d.di_mode & IFMT) != IFDIR) {
VMAP(rvp, vmap);
prdev("Root inode %d is not a directory",
rip->i_dev, rip->i_ino);
xfs_iunlock(rip, XFS_ILOCK_EXCL);
VN_RELE(rvp);
vn_purge(rvp, &vmap);
error = XFS_ERROR(EINVAL);
goto error2;
}
VN_FLAGSET(rvp, VROOT);
mp->m_rootip = rip; /* save it */
xfs_iunlock(rip, XFS_ILOCK_EXCL);
}
/*
* Initialize realtime inode pointers in the mount structure
*/
if (sbp->sb_rbmino != NULLFSINO && read_rootinos == 1) {
error = xfs_iget(mp, NULL, sbp->sb_rbmino, NULL,
&mp->m_rbmip, 0);
if (error) {
/*
* Free up the root inode.
*/
VMAP(rvp, vmap);
VN_RELE(rvp);
vn_purge(rvp, &vmap);
goto error2;
}
ASSERT(mp->m_rbmip != NULL);
ASSERT(sbp->sb_rsumino != NULLFSINO);
error = xfs_iget(mp, NULL, sbp->sb_rsumino, NULL,
&mp->m_rsumip, 0);
if (error) {
/*
* Free up the root and first rt inodes.
*/
VMAP(rvp, vmap);
VN_RELE(rvp);
vn_purge(rvp, &vmap);
rbmvp = XFS_ITOV(mp->m_rbmip);
VMAP(rbmvp, vmap);
VN_RELE(rbmvp);
vn_purge(rbmvp, &vmap);
goto error2;
}
ASSERT(mp->m_rsumip != NULL);
}
#ifndef SIM
quotaflags = 0;
if (XFS_IS_QUOTA_ON(mp) ||
(XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
mp->m_sb.sb_qflags & (XFS_UQUOTA_ACCT|XFS_PQUOTA_ACCT))) {
/*
* Call mount_quotas at this point only if we won't have to do
* a quotacheck.
*/
if (XFS_IS_QUOTA_ON(mp) &&
XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
(! XFS_QM_NEED_QUOTACHECK(mp))) {
(void) xfs_qm_mount_quotas(mp);
/*
* If error occured, qm_mount_quotas code
* has already disabled quotas. So, just finish
* mounting, and get on with the boring life
* without disk quotas.
*/
} 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;
}
}
#endif
/*
* Finish recovering the file system. This part needed to be
* delayed until after the root and real-time bitmap inodes
* were consistently read in.
*/
#ifndef SIM
error = xfs_log_mount_finish(mp);
#endif
if (error) {
goto error2;
}
#ifndef SIM
if (quotaflags) {
ASSERT(mp->m_qflags == 0);
mp->m_qflags = quotaflags;
(void) xfs_qm_mount_quotas(mp);
}
#ifdef DEBUG
if (! (XFS_IS_QUOTA_ON(mp))) {
cmn_err(CE_NOTE, "Disk quotas not turned on: %s", mp->m_fsname);
} else {
cmn_err(CE_NOTE, "Disk quotas turned on: %s", mp->m_fsname);
}
#endif
#endif /* !SIM */
/*
* Initialize directory manager's entries.
*/
xfs_dir_mount(mp);
return (0);
error2:
xfs_ihash_free(mp);
mrfree(&mp->m_peraglock);
kmem_free(mp->m_perag, sbp->sb_agcount * sizeof(xfs_perag_t));
mp->m_perag = NULL;
/* FALLTHROUGH */
error1:
/*
* Use xfs_getsb() so that the buffer will be locked
* when we call nfreerbuf().
*/
bp = xfs_getsb(mp, 0);
nfreerbuf(bp);
mp->m_sb_bp = NULL;
return error;
error0:
nfreerbuf(bp);
return error;
} /* xfs_mountfs_int */
/*
* wrapper routine for the kernel
*/
int
xfs_mountfs(vfs_t *vfsp, xfs_mount_t *mp, dev_t dev)
{
return(xfs_mountfs_int(vfsp, mp, dev, 1));
}
#ifdef SIM
STATIC xfs_mount_t *
xfs_mount_int(dev_t dev, dev_t logdev, dev_t rtdev, int read_rootinos)
{
int error;
xfs_mount_t *mp;
vfs_t *vfsp;
mp = xfs_mount_init();
vfsp = kmem_zalloc(sizeof(vfs_t), KM_SLEEP);
VFS_INIT(vfsp);
vfs_insertbhv(vfsp, &mp->m_bhv, &xfs_vfsops, mp);
mp->m_dev = dev;
mp->m_rtdev = rtdev;
mp->m_logdev = logdev;
vfsp->vfs_dev = dev;
error = xfs_mountfs_int(vfsp, mp, dev, read_rootinos);
if (error) {
kmem_free(mp, sizeof(*mp));
return 0;
}
/*
* Call the log's mount-time initialization.
*/
if (logdev) {
xfs_sb_t *sbp;
xfs_fsblock_t logstart;
sbp = XFS_BUF_TO_SBP(mp->m_sb_bp);
logstart = sbp->sb_logstart;
xfs_log_mount(mp, logdev, XFS_FSB_TO_DADDR(mp, logstart),
XFS_FSB_TO_BB(mp, sbp->sb_logblocks));
}
return mp;
}
/*
* xfs_mount is the function used by the simulation environment
* to start the file system.
*/
xfs_mount_t *
xfs_mount(dev_t dev, dev_t logdev, dev_t rtdev)
{
return(xfs_mount_int(dev, logdev, rtdev, 1));
}
/*
* xfs_mount_setup is used by the simulation environment to
* mount a filesystem where everything but the superblock
* might be trashed. Beware: the root inodes are NOT read in.
*/
xfs_mount_t *
xfs_mount_partial(dev_t dev, dev_t logdev, dev_t rtdev)
{
return(xfs_mount_int(dev, logdev, rtdev, 0));
}
#endif /* SIM */
/*
* xfs_unmountfs
*
* This code is common to all unmounting paths: via non-root unmount,
* the simulator/mkfs path, and possibly the root unmount path.
*
* 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, int vfs_flags, struct cred *cr)
{
buf_t *bp;
/* REFERENCED */
int error;
/* REFERENCED */
int unused;
struct bdevsw *my_bdevsw;
xfs_iflush_all(mp, XFS_FLUSH_ALL);
#ifndef SIM
/*
* Flush and purge the dquot cache.
*/
if (mp->m_quotainfo) {
xfs_qm_dqflush_all(mp, XFS_QMOPT_SYNC);
xfs_qm_dqpurge_all(mp,
XFS_QMOPT_UQUOTA|XFS_QMOPT_PQUOTA|
XFS_QMOPT_UMOUNTING);
}
#endif
/*
* 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);
binval(mp->m_dev);
bflushed(mp->m_dev);
if (mp->m_rtdev) {
binval(mp->m_rtdev);
}
bp = xfs_getsb(mp, 0);
bp->b_flags &= ~(B_DONE | B_READ);
bp->b_flags |= B_WRITE;
bwait_unpin(bp);
my_bdevsw = get_bdevsw(mp->m_dev);
ASSERT(my_bdevsw != NULL);
bdstrat(my_bdevsw, bp);
error = iowait(bp);
ASSERT(error == 0);
xfs_log_unmount(mp); /* Done! No more fs ops. */
if (mp->m_ddevp) {
VOP_CLOSE(mp->m_ddevp, vfs_flags, L_TRUE, 0, cr, NULL, unused);
VN_RELE(mp->m_ddevp);
}
if (mp->m_rtdevp) {
VOP_CLOSE(mp->m_rtdevp, vfs_flags, L_TRUE, 0, cr, NULL, unused);
VN_RELE(mp->m_rtdevp);
}
if (mp->m_logdevp && mp->m_logdevp != mp->m_ddevp) {
VOP_CLOSE(mp->m_logdevp, vfs_flags, L_TRUE, 0, cr, NULL, unused);
VN_RELE(mp->m_logdevp);
}
nfreerbuf(bp);
/*
* All inodes from this mount point should be freed.
*/
ASSERT(mp->m_inodes == NULL);
#ifndef SIM
xfs_uuid_unmount(mp);
#endif
xfs_mount_free(mp);
return 0;
} /* xfs_unmountfs */
#ifdef SIM
/*
* xfs_umount is the function used by the simulation environment
* to stop the file system.
*/
void
xfs_umount(xfs_mount_t *mp)
{
xfs_unmountfs(mp, 0, NULL);
}
#endif /* SIM */
/*
* 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)
{
buf_t *bp;
int first;
int last;
xfs_mount_t *mp;
xfs_sb_t *sbp;
static const short offsets[] = {
offsetof(xfs_sb_t, sb_magicnum),
offsetof(xfs_sb_t, sb_blocksize),
offsetof(xfs_sb_t, sb_dblocks),
offsetof(xfs_sb_t, sb_rblocks),
offsetof(xfs_sb_t, sb_rextents),
offsetof(xfs_sb_t, sb_uuid),
offsetof(xfs_sb_t, sb_logstart),
offsetof(xfs_sb_t, sb_rootino),
offsetof(xfs_sb_t, sb_rbmino),
offsetof(xfs_sb_t, sb_rsumino),
offsetof(xfs_sb_t, sb_rextsize),
offsetof(xfs_sb_t, sb_agblocks),
offsetof(xfs_sb_t, sb_agcount),
offsetof(xfs_sb_t, sb_rbmblocks),
offsetof(xfs_sb_t, sb_logblocks),
offsetof(xfs_sb_t, sb_versionnum),
offsetof(xfs_sb_t, sb_sectsize),
offsetof(xfs_sb_t, sb_inodesize),
offsetof(xfs_sb_t, sb_inopblock),
offsetof(xfs_sb_t, sb_fname[0]),
offsetof(xfs_sb_t, sb_fpack[0]),
offsetof(xfs_sb_t, sb_blocklog),
offsetof(xfs_sb_t, sb_sectlog),
offsetof(xfs_sb_t, sb_inodelog),
offsetof(xfs_sb_t, sb_inopblog),
offsetof(xfs_sb_t, sb_agblklog),
offsetof(xfs_sb_t, sb_rextslog),
offsetof(xfs_sb_t, sb_inprogress),
offsetof(xfs_sb_t, sb_imax_pct),
offsetof(xfs_sb_t, sb_icount),
offsetof(xfs_sb_t, sb_ifree),
offsetof(xfs_sb_t, sb_fdblocks),
offsetof(xfs_sb_t, sb_frextents),
offsetof(xfs_sb_t, sb_uquotino),
offsetof(xfs_sb_t, sb_pquotino),
offsetof(xfs_sb_t, sb_qflags),
offsetof(xfs_sb_t, sb_inoalignmt),
sizeof(xfs_sb_t)
};
ASSERT(fields);
if (!fields)
return;
mp = tp->t_mountp;
bp = xfs_trans_getsb(tp, 0);
sbp = XFS_BUF_TO_SBP(bp);
first = sizeof(xfs_sb_t);
last = 0;
while (fields) {
xfs_sb_field_t f;
int first1;
int last1;
f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields);
ASSERT((1LL << f) & XFS_SB_MOD_BITS);
first1 = offsets[f];
last1 = offsets[f + 1] - 1;
bcopy((caddr_t)&mp->m_sb + first1, (caddr_t)sbp + first1,
last1 - first1 + 1);
if (first1 < first)
first = first1;
if (last1 > last)
last = last1;
fields &= ~(1LL << f);
}
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)
{
register int scounter; /* short counter for 32 bit fields */
register long long lcounter; /* long counter for 64 bit fields */
/*
* Obtain the in-core superblock spin lock and 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 = 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 = 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 = mp->m_sb.sb_fdblocks;
lcounter += delta;
if (lcounter < 0) {
return (XFS_ERROR(ENOSPC));
}
mp->m_sb.sb_fdblocks = lcounter;
return (0);
case XFS_SBS_FREXTENTS:
lcounter = 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 = 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);
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 s;
int status;
s = XFS_SB_LOCK(mp);
status = xfs_mod_incore_sb_unlocked(mp, field, delta);
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 s;
int status;
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);
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));
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.
*/
buf_t *
xfs_getsb(xfs_mount_t *mp,
int flags)
{
buf_t *bp;
ASSERT(mp->m_sb_bp != NULL);
bp = mp->m_sb_bp;
if (flags & BUF_TRYLOCK) {
if (!cpsema(&bp->b_lock)) {
return NULL;
}
} else {
psema(&bp->b_lock, PRIBIO);
}
ASSERT(bp->b_flags & B_DONE);
return (bp);
}
/*
* This is the brelse function for the private superblock buffer.
* All it needs to do is unlock the buffer and clear any spurious
* flags.
*/
STATIC void
xfs_sb_relse(buf_t *bp)
{
ASSERT(bp->b_flags & B_BUSY);
ASSERT(valusema(&bp->b_lock) <= 0);
bp->b_flags &= ~(B_ASYNC | B_READ);
bp->b_flags2 = 0;
bp->av_forw = NULL;
bp->av_back = NULL;
vsema(&bp->b_lock);
}
#ifndef SIM
/*
* See if the uuid is unique among mounted xfs filesystems.
* If it's not, allocate a new one so it is.
*/
STATIC void
xfs_uuid_mount(xfs_mount_t *mp)
{
int hole;
int i;
uint_t status;
mutex_lock(&xfs_uuidtabmon, PVFS);
for (i = 0, hole = -1; i < xfs_uuidtab_size; i++) {
if (uuid_is_nil(&xfs_uuidtab[i], &status)) {
hole = i;
continue;
}
if (!uuid_equal(&mp->m_sb.sb_uuid, &xfs_uuidtab[i], &status))
continue;
uuid_create(&mp->m_sb.sb_uuid, &status);
XFS_BUF_TO_SBP(mp->m_sb_bp)->sb_uuid = mp->m_sb.sb_uuid;
i = -1;
/* restart loop from the top */
}
if (hole < 0) {
xfs_uuidtab = kmem_realloc(xfs_uuidtab,
(xfs_uuidtab_size + 1) * sizeof(*xfs_uuidtab),
KM_SLEEP);
hole = xfs_uuidtab_size++;
}
xfs_uuidtab[hole] = mp->m_sb.sb_uuid;
mutex_unlock(&xfs_uuidtabmon);
}
/*
* Remove filesystem from the uuid table.
*/
STATIC void
xfs_uuid_unmount(xfs_mount_t *mp)
{
int i;
uint_t status;
mutex_lock(&xfs_uuidtabmon, PVFS);
for (i = 0; i < xfs_uuidtab_size; i++) {
if (uuid_is_nil(&xfs_uuidtab[i], &status))
continue;
if (!uuid_equal(&mp->m_sb.sb_uuid, &xfs_uuidtab[i], &status))
continue;
uuid_create_nil(&xfs_uuidtab[i], &status);
break;
}
ASSERT(i < xfs_uuidtab_size);
mutex_unlock(&xfs_uuidtabmon);
}
#endif /* !SIM */
![[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