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alistair23-linux/fs/xfs/xfs_mount.c
Nathan Scott d8cc890d40 [XFS] Ondisk format extension for extended attributes (attr2). Basically, 
the data/attr forks now grow up/down from either end of the literal area,
rather than dividing the literal area into two chunks and growing both
upward.  Means we can now make much more efficient use of the attribute
space, incl. fitting DMF attributes inline in 256 byte inodes, and large
jumps in dbench3 performance numbers.  It is self enabling, but can be
forced on/off via the attr2/noattr2 mount options.

SGI-PV: 941645
SGI-Modid: xfs-linux:xfs-kern:23835a

Signed-off-by: Nathan Scott <nathans@sgi.com>
2005-11-02 10:34:53 +11:00

1589 lines
41 KiB
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/*
* Copyright (c) 2000-2005 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 "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_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.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_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.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"
#include "xfs_fsops.h"
STATIC void xfs_mount_log_sbunit(xfs_mount_t *, __int64_t);
STATIC int xfs_uuid_mount(xfs_mount_t *);
STATIC void xfs_uuid_unmount(xfs_mount_t *mp);
STATIC void xfs_unmountfs_wait(xfs_mount_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_logsectlog), 0 },
{ offsetof(xfs_sb_t, sb_logsectsize),0 },
{ offsetof(xfs_sb_t, sb_logsunit), 0 },
{ offsetof(xfs_sb_t, sb_features2), 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);
atomic_set(&mp->m_active_trans, 0);
return mp;
}
/*
* 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);
}
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_quotainfo)
XFS_QM_DONE(mp);
if (mp->m_fsname != NULL)
kmem_free(mp->m_fsname, mp->m_fsname_len);
if (remove_bhv) {
struct vfs *vfsp = XFS_MTOVFS(mp);
bhv_remove_all_vfsops(vfsp, 0);
VFS_REMOVEBHV(vfsp, &mp->m_bhv);
}
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 (unlikely(
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.");
XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(1)",
XFS_ERRLEVEL_HIGH, mp, sbp);
return XFS_ERROR(EFSCORRUPTED);
}
if (unlikely(
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.");
XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(2)",
XFS_ERRLEVEL_HIGH, mp, sbp);
return XFS_ERROR(EFSCORRUPTED);
}
/*
* More sanity checking. These were stolen directly from
* xfs_repair.
*/
if (unlikely(
sbp->sb_agcount <= 0 ||
sbp->sb_sectsize < XFS_MIN_SECTORSIZE ||
sbp->sb_sectsize > XFS_MAX_SECTORSIZE ||
sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG ||
sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG ||
sbp->sb_blocksize < XFS_MIN_BLOCKSIZE ||
sbp->sb_blocksize > XFS_MAX_BLOCKSIZE ||
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");
XFS_CORRUPTION_ERROR("xfs_mount_validate_sb(3)",
XFS_ERRLEVEL_LOW, mp, sbp);
return XFS_ERROR(EFSCORRUPTED);
}
/*
* Sanity check AG count, size fields against data size field
*/
if (unlikely(
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");
XFS_ERROR_REPORT("xfs_mount_validate_sb(4)",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
ASSERT(sbp->sb_blocklog >= BBSHIFT);
#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */
if (unlikely(
(sbp->sb_dblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX ||
(sbp->sb_rblocks >> (PAGE_SHIFT - sbp->sb_blocklog)) > ULONG_MAX)) {
#else /* Limited by UINT_MAX of sectors */
if (unlikely(
(sbp->sb_dblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX ||
(sbp->sb_rblocks << (sbp->sb_blocklog - BBSHIFT)) > UINT_MAX)) {
#endif
cmn_err(CE_WARN,
"XFS: File system is too large to be mounted on this system.");
return XFS_ERROR(E2BIG);
}
if (unlikely(sbp->sb_inprogress)) {
cmn_err(CE_WARN, "XFS: file system busy");
XFS_ERROR_REPORT("xfs_mount_validate_sb(5)",
XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
/*
* Version 1 directory format has never worked on Linux.
*/
if (unlikely(!XFS_SB_VERSION_HASDIRV2(sbp))) {
cmn_err(CE_WARN,
"XFS: Attempted to mount file system using version 1 directory format");
return XFS_ERROR(ENOSYS);
}
/*
* Until this is fixed only page-sized or smaller data blocks work.
*/
if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) {
cmn_err(CE_WARN,
"XFS: Attempted to mount file system with blocksize %d bytes",
sbp->sb_blocksize);
cmn_err(CE_WARN,
"XFS: Only page-sized (%ld) or less blocksizes currently work.",
PAGE_SIZE);
return XFS_ERROR(ENOSYS);
}
return 0;
}
xfs_agnumber_t
xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount)
{
xfs_agnumber_t 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, or if specifically requested..
*/
if ((mp->m_flags & XFS_MOUNT_32BITINOOPT) && ino > max_inum) {
mp->m_flags |= XFS_MOUNT_32BITINODES;
} else {
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;
}
}
return 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
* fields - which fields to copy (bitmask)
*/
void
xfs_xlatesb(
void *data,
xfs_sb_t *sb,
int dir,
__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 (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_CONVERT);
break;
case 4:
INT_XLATE(*(__uint32_t*)(buf_ptr+first),
*(__uint32_t*)(mem_ptr+first),
dir, ARCH_CONVERT);
break;
case 8:
INT_XLATE(*(__uint64_t*)(buf_ptr+first),
*(__uint64_t*)(mem_ptr+first), dir, ARCH_CONVERT);
break;
default:
ASSERT(0);
}
}
fields &= ~(1LL << f);
}
}
/*
* xfs_readsb
*
* Does the initial read of the superblock.
*/
int
xfs_readsb(xfs_mount_t *mp)
{
unsigned int sector_size;
unsigned int extra_flags;
xfs_buf_t *bp;
xfs_sb_t *sbp;
int error;
ASSERT(mp->m_sb_bp == NULL);
ASSERT(mp->m_ddev_targp != NULL);
/*
* Allocate a (locked) buffer to hold the superblock.
* This will be kept around at all times to optimize
* access to the superblock.
*/
sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
extra_flags = XFS_BUF_LOCK | XFS_BUF_MANAGE | XFS_BUF_MAPPED;
bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
BTOBB(sector_size), extra_flags);
if (!bp || XFS_BUF_ISERROR(bp)) {
cmn_err(CE_WARN, "XFS: SB read failed");
error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
goto fail;
}
ASSERT(XFS_BUF_ISBUSY(bp));
ASSERT(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, XFS_SB_ALL_BITS);
error = xfs_mount_validate_sb(mp, &(mp->m_sb));
if (error) {
cmn_err(CE_WARN, "XFS: SB validate failed");
goto fail;
}
/*
* We must be able to do sector-sized and sector-aligned IO.
*/
if (sector_size > mp->m_sb.sb_sectsize) {
cmn_err(CE_WARN,
"XFS: device supports only %u byte sectors (not %u)",
sector_size, mp->m_sb.sb_sectsize);
error = ENOSYS;
goto fail;
}
/*
* If device sector size is smaller than the superblock size,
* re-read the superblock so the buffer is correctly sized.
*/
if (sector_size < mp->m_sb.sb_sectsize) {
XFS_BUF_UNMANAGE(bp);
xfs_buf_relse(bp);
sector_size = mp->m_sb.sb_sectsize;
bp = xfs_buf_read_flags(mp->m_ddev_targp, XFS_SB_DADDR,
BTOBB(sector_size), extra_flags);
if (!bp || XFS_BUF_ISERROR(bp)) {
cmn_err(CE_WARN, "XFS: SB re-read failed");
error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
goto fail;
}
ASSERT(XFS_BUF_ISBUSY(bp));
ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
}
mp->m_sb_bp = bp;
xfs_buf_relse(bp);
ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
return 0;
fail:
if (bp) {
XFS_BUF_UNMANAGE(bp);
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
*/
STATIC void
xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
{
int i;
mp->m_agfrotor = mp->m_agirotor = 0;
spinlock_init(&mp->m_agirotor_lock, "m_agirotor_lock");
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_sectbb_log = sbp->sb_sectlog - 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;
INIT_LIST_HEAD(&mp->m_del_inodes);
/*
* 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(MINABTPTRS);
break;
case 512:
case 1024:
case 2048:
mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
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;
}
/*
* 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,
int mfsi_flags)
{
xfs_buf_t *bp;
xfs_sb_t *sbp = &(mp->m_sb);
xfs_inode_t *rip;
vnode_t *rvp = NULL;
int readio_log, writeio_log;
xfs_daddr_t d;
__uint64_t ret64;
__int64_t update_flags;
uint quotamount, quotaflags;
int agno;
int uuid_mounted = 0;
int error = 0;
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;
}
xfs_fs_cmn_err(CE_WARN, mp,
"stripe alignment turned off: sunit(%d)/swidth(%d) incompatible with agsize(%d)",
mp->m_dalign, mp->m_swidth,
sbp->sb_agblocks);
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) {
xfs_fs_cmn_err(CE_WARN, mp,
"stripe alignment turned off: sunit(%d) less than bsize(%d)",
mp->m_dalign,
mp->m_blockmask +1);
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;
mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog);
/*
* 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;
}
error = xfs_read_buf(mp, mp->m_ddev_targp,
d - XFS_FSS_TO_BB(mp, 1),
XFS_FSS_TO_BB(mp, 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 (((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 - XFS_FSB_TO_BB(mp, 1),
XFS_FSB_TO_BB(mp, 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);
}
/*
* 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 = (xfs_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);
/*
* 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);
mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
/*
* log's mount-time initialization. Perform 1st part recovery if needed
*/
if (likely(sbp->sb_logblocks > 0)) { /* check for volume case */
error = xfs_log_mount(mp, mp->m_logdev_targp,
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");
XFS_ERROR_REPORT("xfs_mountfs_int(1)", XFS_ERRLEVEL_LOW, mp);
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, 0, 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 (unlikely((rip->i_d.di_mode & S_IFMT) != S_IFDIR)) {
cmn_err(CE_WARN, "XFS: corrupted root inode");
prdev("Root inode %llu is not a directory",
mp->m_ddev_targp, (unsigned long long)rip->i_ino);
xfs_iunlock(rip, XFS_ILOCK_EXCL);
XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
mp);
error = XFS_ERROR(EFSCORRUPTED);
goto error4;
}
mp->m_rootip = rip; /* save it */
xfs_iunlock(rip, XFS_ILOCK_EXCL);
/*
* 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");
goto error4;
}
/*
* 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);
/*
* Initialise the XFS quota management subsystem for this mount
*/
if ((error = XFS_QM_INIT(mp, &quotamount, &quotaflags)))
goto error4;
/*
* 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 error4;
}
/*
* Complete the quota initialisation, post-log-replay component.
*/
if ((error = XFS_QM_MOUNT(mp, quotamount, quotaflags, mfsi_flags)))
goto error4;
return 0;
error4:
/*
* Free up the root inode.
*/
VN_RELE(rvp);
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)
{
struct vfs *vfsp = XFS_MTOVFS(mp);
#if defined(DEBUG) || defined(INDUCE_IO_ERROR)
int64_t fsid;
#endif
xfs_iflush_all(mp);
XFS_QM_DQPURGEALL(mp,
XFS_QMOPT_UQUOTA | XFS_QMOPT_GQUOTA | XFS_QMOPT_UMOUNTING);
/*
* 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_unmountfs_wait(mp); /* wait for async bufs */
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);
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, &vfsp->vfs_fsid, sizeof(int64_t));
xfs_errortag_clearall_umount(fsid, mp->m_fsname, 0);
#endif
XFS_IODONE(vfsp);
xfs_mount_free(mp, 1);
return 0;
}
void
xfs_unmountfs_close(xfs_mount_t *mp, struct cred *cr)
{
if (mp->m_logdev_targp != mp->m_ddev_targp)
xfs_free_buftarg(mp->m_logdev_targp, 1);
if (mp->m_rtdev_targp)
xfs_free_buftarg(mp->m_rtdev_targp, 1);
xfs_free_buftarg(mp->m_ddev_targp, 0);
}
STATIC void
xfs_unmountfs_wait(xfs_mount_t *mp)
{
if (mp->m_logdev_targp != mp->m_ddev_targp)
xfs_wait_buftarg(mp->m_logdev_targp);
if (mp->m_rtdev_targp)
xfs_wait_buftarg(mp->m_rtdev_targp);
xfs_wait_buftarg(mp->m_ddev_targp);
}
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_ddev_targp);
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, 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 xfs_buf_relse().
*/
bp = xfs_getsb(mp, 0);
XFS_BUF_UNMANAGE(bp);
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)
{
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;
}
if (!uuid_table_insert(&mp->m_sb.sb_uuid)) {
cmn_err(CE_WARN,
"XFS: Filesystem %s has duplicate UUID - can't mount",
mp->m_fsname);
return -1;
}
return 0;
}
/*
* Remove filesystem from the UUID table.
*/
STATIC void
xfs_uuid_unmount(
xfs_mount_t *mp)
{
uuid_table_remove(&mp->m_sb.sb_uuid);
}
/*
* 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);
xfs_trans_commit(tp, 0, NULL);
}
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