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/*
* Copyright (c) 2000 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>
#ifdef CELL_CAPABLE
void cxfs_unmount(xfs_mount_t *);
#else
# define cxfs_unmount(mp) do { } while (0)
#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 },
{ 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;
mrfree(&mp->m_peraglock);
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 == mp->m_dev) {
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 && mp->m_logdev != mp->m_dev) {
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);
}
#ifndef CONFIG_PAGEBUF_DEBUG
/*
* Until this is fixed only page-sized 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) blocksize currently works.",
PAGE_SIZE);
return XFS_ERROR(EWRONGFS);
}
#endif
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;
ASSERT(dir);
ASSERT(fields);
if (!fields)
return;
buf_ptr=(xfs_caddr_t)data;
mem_ptr=(xfs_caddr_t)sb;
while (fields) {
xfs_sb_field_t f;
int first;
int size;
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) {
bcopy(buf_ptr + first, mem_ptr + first, size);
} else {
bcopy(mem_ptr + first, buf_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. This has been split out from
* xfs_mountfs so that the cxfs v1 array mount code can get at the
* unique id for the file system before deciding whether we are going
* to mount things as a cxfs client or server.
*/
int
xfs_readsb(xfs_mount_t *mp, dev_t dev)
{
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;
/*
* 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
* - if XFS_MFSI_CLIENT is set then we are doing an import
* or an enterprise mount in client mode. We do not go
* near the log, and do not mess with a bunch of stuff.
* - If XFS_MFSI_SECOND is set then we are doing a secondary
* mount operation for cxfs which may be client mode
* import or enterprise or a server-mode secondary
* mount operation as part of relocation or recovery.
*/
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, dev))) {
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);
vfsp->vfs_bsize = (u_int)XFS_FSB_TO_B(mp, 1);
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);
bcopy(&ret64, &vfsp->vfs_fsid, 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 && mp->m_logdev != mp->m_dev) {
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_targ, 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;
}
}
/*
* Disallow mount attempts with (IRIX) project quota enabled
*/
if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
(mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT)) {
cmn_err(CE_WARN, "XFS: IRIX project quota are enabled");
error = XFS_ERROR(ENOSYS);
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;
}
/*
* 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;
/*
* For client case we are done now
*/
if (mfsi_flags & XFS_MFSI_CLIENT) {
return(0);
}
/* 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.
*/
mrinit(&mp->m_peraglock, "xperag");
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,
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, rip, vmap);
prdev("Root inode %llu is not a directory",
(int)rip->i_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;
}
VN_FLAGSET(rvp, VROOT);
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))) &&
(is_read_only(mp->m_dev) || is_read_only(mp->m_logdev))) {
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, rip, 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 = ((XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY) &&
mp->m_dev == rootdev && needquotacheck);
if (rootqcheck && (error = xfs_quotacheck_read_only(mp)))
goto error2;
if (xfs_qm_mount_quotas(mp))
xfs_mount_reset_sbqflags(mp);
if (rootqcheck)
XFS_MTOVFS(mp)->vfs_flag |= VFS_RDONLY;
}
#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);
mrfree(&mp->m_peraglock);
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, int vfs_flags, 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_targ);
if (mp->m_rtdev != NODEV) {
xfs_binval(mp->m_rtdev_targ);
}
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)) {
(void)xfs_incore_relse(&mp->m_ddev_targ, 0, 1); /* synchronous*/
}
xfs_unmountfs_close(mp, vfs_flags, 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
*/
bcopy(&(XFS_MTOVFS(mp)->vfs_fsid), &fsid, sizeof(int64_t));
(void) xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
#endif
cxfs_unmount(mp);
xfs_mount_free(mp, 1);
return 0;
}
void
xfs_unmountfs_close(xfs_mount_t *mp, int vfs_flags, struct cred *cr)
{
if (mp->m_ddev_targ.pb_targ)
linvfs_release_buftarg(&mp->m_ddev_targ);
if (mp->m_rtdev_targ.pb_targ)
linvfs_release_buftarg(&mp->m_rtdev_targ);
if (mp->m_logdev_targ.pb_targ &&
mp->m_logdev_targ.pb_targ != mp->m_ddev_targ.pb_targ)
linvfs_release_buftarg(&mp->m_logdev_targ);
}
int
xfs_unmountfs_writesb(xfs_mount_t *mp)
{
xfs_buf_t *sbp;
xfs_sb_t *sb;
int error = 0;
/*
* skip superblock write if fs is read-only, or
* if we are doing a forced umount.
*/
sbp = xfs_getsb(mp, 0);
if (!(XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY ||
XFS_FORCED_SHUTDOWN(mp))) {
/*
* mark shared-readonly if desired
*/
sb = XFS_BUF_TO_SBP(sbp);
if (mp->m_mk_sharedro) {
if (!(sb->sb_flags & XFS_SBF_READONLY))
sb->sb_flags |= XFS_SBF_READONLY;
if (!XFS_SB_VERSION_HASSHARED(sb))
XFS_SB_VERSION_ADDSHARED(sb);
xfs_fs_cmn_err(CE_NOTE, mp,
"Unmounting, marking shared read-only");
}
XFS_BUF_UNDONE(sbp);
XFS_BUF_UNREAD(sbp);
XFS_BUF_UNDELAYWRITE(sbp);
XFS_BUF_WRITE(sbp);
XFS_BUF_UNASYNC(sbp);
ASSERT(XFS_BUF_TARGET(sbp) == mp->m_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)
{
int 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)
{
int 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;
int 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)
{
int 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)
{
int 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 ioflag,
int level)
{
int s;
int do_lock = 0;
if (!mp->m_frozen) {
if (level == XFS_FREEZE_TRANS)
atomic_inc(&mp->m_active_trans);
return;
}
s = mutex_spinlock(&mp->m_freeze_lock);
if (mp->m_frozen < level) {
mutex_spinunlock(&mp->m_freeze_lock, s);
if (level == XFS_FREEZE_TRANS)
atomic_inc(&mp->m_active_trans);
return;
}
if ((level == XFS_FREEZE_WRITE) && (ioflag & IO_ISLOCKED)) {
xfs_rwunlock(bdp, (ioflag & IO_DIRECT) ?
VRWLOCK_WRITE_DIRECT : VRWLOCK_WRITE);
do_lock = 1;
}
sv_wait(&mp->m_wait_unfreeze, PINOD, &mp->m_freeze_lock, s);
if (level == XFS_FREEZE_TRANS)
atomic_inc(&mp->m_active_trans);
if (do_lock) {
xfs_rwlock(bdp, (ioflag & IO_DIRECT) ?
VRWLOCK_WRITE_DIRECT : VRWLOCK_WRITE);
}
}
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