2030 lines
51 KiB
C
Executable File
2030 lines
51 KiB
C
Executable File
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_inum.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_da_format.h"
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#include "xfs_inode.h"
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#include "xfs_dir2.h"
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#include "xfs_ialloc.h"
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#include "xfs_alloc.h"
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#include "xfs_rtalloc.h"
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#include "xfs_bmap.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_log.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_fsops.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_dinode.h"
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#include "xfs_sysfs.h"
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#ifdef HAVE_PERCPU_SB
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STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t,
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int);
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STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t,
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int);
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STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
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#else
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#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
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#define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0)
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#endif
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static DEFINE_MUTEX(xfs_uuid_table_mutex);
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static int xfs_uuid_table_size;
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static uuid_t *xfs_uuid_table;
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/*
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* See if the UUID is unique among mounted XFS filesystems.
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* Mount fails if UUID is nil or a FS with the same UUID is already mounted.
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*/
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STATIC int
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xfs_uuid_mount(
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struct xfs_mount *mp)
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{
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uuid_t *uuid = &mp->m_sb.sb_uuid;
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int hole, i;
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if (mp->m_flags & XFS_MOUNT_NOUUID)
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return 0;
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if (uuid_is_nil(uuid)) {
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xfs_warn(mp, "Filesystem has nil UUID - can't mount");
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return -EINVAL;
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}
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mutex_lock(&xfs_uuid_table_mutex);
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for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
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if (uuid_is_nil(&xfs_uuid_table[i])) {
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hole = i;
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continue;
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}
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if (uuid_equal(uuid, &xfs_uuid_table[i]))
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goto out_duplicate;
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}
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if (hole < 0) {
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xfs_uuid_table = kmem_realloc(xfs_uuid_table,
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(xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
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xfs_uuid_table_size * sizeof(*xfs_uuid_table),
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KM_SLEEP);
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hole = xfs_uuid_table_size++;
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}
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xfs_uuid_table[hole] = *uuid;
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mutex_unlock(&xfs_uuid_table_mutex);
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return 0;
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out_duplicate:
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mutex_unlock(&xfs_uuid_table_mutex);
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xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
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return -EINVAL;
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}
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STATIC void
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xfs_uuid_unmount(
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struct xfs_mount *mp)
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{
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uuid_t *uuid = &mp->m_sb.sb_uuid;
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int i;
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if (mp->m_flags & XFS_MOUNT_NOUUID)
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return;
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mutex_lock(&xfs_uuid_table_mutex);
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for (i = 0; i < xfs_uuid_table_size; i++) {
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if (uuid_is_nil(&xfs_uuid_table[i]))
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continue;
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if (!uuid_equal(uuid, &xfs_uuid_table[i]))
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continue;
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memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
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break;
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}
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ASSERT(i < xfs_uuid_table_size);
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mutex_unlock(&xfs_uuid_table_mutex);
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}
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STATIC void
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__xfs_free_perag(
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struct rcu_head *head)
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{
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struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
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ASSERT(atomic_read(&pag->pag_ref) == 0);
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kmem_free(pag);
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}
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/*
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* Free up the per-ag resources associated with the mount structure.
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*/
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STATIC void
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xfs_free_perag(
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xfs_mount_t *mp)
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{
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xfs_agnumber_t agno;
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struct xfs_perag *pag;
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for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
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spin_lock(&mp->m_perag_lock);
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pag = radix_tree_delete(&mp->m_perag_tree, agno);
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spin_unlock(&mp->m_perag_lock);
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ASSERT(pag);
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ASSERT(atomic_read(&pag->pag_ref) == 0);
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call_rcu(&pag->rcu_head, __xfs_free_perag);
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}
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}
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/*
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* Check size of device based on the (data/realtime) block count.
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* Note: this check is used by the growfs code as well as mount.
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*/
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int
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xfs_sb_validate_fsb_count(
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xfs_sb_t *sbp,
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__uint64_t nblocks)
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{
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ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
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ASSERT(sbp->sb_blocklog >= BBSHIFT);
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/* Limited by ULONG_MAX of page cache index */
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if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
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return -EFBIG;
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return 0;
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}
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int
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xfs_initialize_perag(
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xfs_mount_t *mp,
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xfs_agnumber_t agcount,
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xfs_agnumber_t *maxagi)
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{
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xfs_agnumber_t index;
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xfs_agnumber_t first_initialised = 0;
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xfs_perag_t *pag;
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xfs_agino_t agino;
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xfs_ino_t ino;
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xfs_sb_t *sbp = &mp->m_sb;
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int error = -ENOMEM;
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/*
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* Walk the current per-ag tree so we don't try to initialise AGs
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* that already exist (growfs case). Allocate and insert all the
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* AGs we don't find ready for initialisation.
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*/
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for (index = 0; index < agcount; index++) {
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pag = xfs_perag_get(mp, index);
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if (pag) {
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xfs_perag_put(pag);
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continue;
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}
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if (!first_initialised)
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first_initialised = index;
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pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
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if (!pag)
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goto out_unwind;
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pag->pag_agno = index;
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pag->pag_mount = mp;
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spin_lock_init(&pag->pag_ici_lock);
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mutex_init(&pag->pag_ici_reclaim_lock);
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INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
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spin_lock_init(&pag->pag_buf_lock);
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pag->pag_buf_tree = RB_ROOT;
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if (radix_tree_preload(GFP_NOFS))
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goto out_unwind;
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spin_lock(&mp->m_perag_lock);
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if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
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BUG();
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spin_unlock(&mp->m_perag_lock);
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radix_tree_preload_end();
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error = -EEXIST;
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goto out_unwind;
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}
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spin_unlock(&mp->m_perag_lock);
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radix_tree_preload_end();
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}
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/*
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* If we mount with the inode64 option, or no inode overflows
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* the legacy 32-bit address space clear the inode32 option.
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*/
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agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
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ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
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if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
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mp->m_flags |= XFS_MOUNT_32BITINODES;
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else
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mp->m_flags &= ~XFS_MOUNT_32BITINODES;
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if (mp->m_flags & XFS_MOUNT_32BITINODES)
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index = xfs_set_inode32(mp, agcount);
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else
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index = xfs_set_inode64(mp, agcount);
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if (maxagi)
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*maxagi = index;
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return 0;
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out_unwind:
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kmem_free(pag);
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for (; index > first_initialised; index--) {
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pag = radix_tree_delete(&mp->m_perag_tree, index);
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kmem_free(pag);
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}
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return error;
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}
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/*
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* xfs_readsb
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*
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* Does the initial read of the superblock.
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*/
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int
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xfs_readsb(
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struct xfs_mount *mp,
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int flags)
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{
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unsigned int sector_size;
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struct xfs_buf *bp;
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struct xfs_sb *sbp = &mp->m_sb;
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int error;
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int loud = !(flags & XFS_MFSI_QUIET);
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const struct xfs_buf_ops *buf_ops;
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ASSERT(mp->m_sb_bp == NULL);
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ASSERT(mp->m_ddev_targp != NULL);
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/*
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* For the initial read, we must guess at the sector
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* size based on the block device. It's enough to
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* get the sb_sectsize out of the superblock and
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* then reread with the proper length.
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* We don't verify it yet, because it may not be complete.
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*/
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sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
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buf_ops = NULL;
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/*
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* Allocate a (locked) buffer to hold the superblock.
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* This will be kept around at all times to optimize
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* access to the superblock.
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*/
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reread:
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error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
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BTOBB(sector_size), 0, &bp, buf_ops);
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if (error) {
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if (loud)
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xfs_warn(mp, "SB validate failed with error %d.", error);
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/* bad CRC means corrupted metadata */
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if (error == -EFSBADCRC)
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error = -EFSCORRUPTED;
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return error;
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}
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/*
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* Initialize the mount structure from the superblock.
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*/
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xfs_sb_from_disk(sbp, XFS_BUF_TO_SBP(bp));
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/*
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* If we haven't validated the superblock, do so now before we try
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* to check the sector size and reread the superblock appropriately.
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*/
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if (sbp->sb_magicnum != XFS_SB_MAGIC) {
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if (loud)
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xfs_warn(mp, "Invalid superblock magic number");
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error = -EINVAL;
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goto release_buf;
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}
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/*
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* We must be able to do sector-sized and sector-aligned IO.
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*/
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if (sector_size > sbp->sb_sectsize) {
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if (loud)
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xfs_warn(mp, "device supports %u byte sectors (not %u)",
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sector_size, sbp->sb_sectsize);
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error = -ENOSYS;
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goto release_buf;
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}
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if (buf_ops == NULL) {
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/*
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* Re-read the superblock so the buffer is correctly sized,
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* and properly verified.
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*/
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xfs_buf_relse(bp);
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sector_size = sbp->sb_sectsize;
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buf_ops = loud ? &xfs_sb_buf_ops : &xfs_sb_quiet_buf_ops;
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goto reread;
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}
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/* Initialize per-cpu counters */
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xfs_icsb_reinit_counters(mp);
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/* no need to be quiet anymore, so reset the buf ops */
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bp->b_ops = &xfs_sb_buf_ops;
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mp->m_sb_bp = bp;
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xfs_buf_unlock(bp);
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return 0;
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release_buf:
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xfs_buf_relse(bp);
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return error;
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}
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/*
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* Update alignment values based on mount options and sb values
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*/
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STATIC int
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xfs_update_alignment(xfs_mount_t *mp)
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{
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xfs_sb_t *sbp = &(mp->m_sb);
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if (mp->m_dalign) {
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/*
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* If stripe unit and stripe width are not multiples
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* of the fs blocksize turn off alignment.
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*/
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if ((BBTOB(mp->m_dalign) & mp->m_blockmask) ||
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(BBTOB(mp->m_swidth) & mp->m_blockmask)) {
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xfs_warn(mp,
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"alignment check failed: sunit/swidth vs. blocksize(%d)",
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sbp->sb_blocksize);
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return -EINVAL;
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} else {
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/*
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* Convert the stripe unit and width to FSBs.
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*/
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mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign);
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if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) {
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xfs_warn(mp,
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"alignment check failed: sunit/swidth vs. agsize(%d)",
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sbp->sb_agblocks);
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return -EINVAL;
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} else if (mp->m_dalign) {
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mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth);
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} else {
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xfs_warn(mp,
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"alignment check failed: sunit(%d) less than bsize(%d)",
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mp->m_dalign, sbp->sb_blocksize);
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return -EINVAL;
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}
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}
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/*
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* Update superblock with new values
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* and log changes
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*/
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if (xfs_sb_version_hasdalign(sbp)) {
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if (sbp->sb_unit != mp->m_dalign) {
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sbp->sb_unit = mp->m_dalign;
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mp->m_update_flags |= XFS_SB_UNIT;
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}
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if (sbp->sb_width != mp->m_swidth) {
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sbp->sb_width = mp->m_swidth;
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mp->m_update_flags |= XFS_SB_WIDTH;
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}
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} else {
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xfs_warn(mp,
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"cannot change alignment: superblock does not support data alignment");
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return -EINVAL;
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}
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} else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN &&
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xfs_sb_version_hasdalign(&mp->m_sb)) {
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mp->m_dalign = sbp->sb_unit;
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mp->m_swidth = sbp->sb_width;
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}
|
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|
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return 0;
|
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}
|
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|
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/*
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* Set the maximum inode count for this filesystem
|
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*/
|
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STATIC void
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xfs_set_maxicount(xfs_mount_t *mp)
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{
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xfs_sb_t *sbp = &(mp->m_sb);
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__uint64_t icount;
|
|
|
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if (sbp->sb_imax_pct) {
|
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/*
|
|
* Make sure the maximum inode count is a multiple
|
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* of the units we allocate inodes in.
|
|
*/
|
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icount = sbp->sb_dblocks * sbp->sb_imax_pct;
|
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do_div(icount, 100);
|
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do_div(icount, mp->m_ialloc_blks);
|
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mp->m_maxicount = (icount * mp->m_ialloc_blks) <<
|
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sbp->sb_inopblog;
|
|
} else {
|
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mp->m_maxicount = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
STATIC void
|
|
xfs_set_rw_sizes(xfs_mount_t *mp)
|
|
{
|
|
xfs_sb_t *sbp = &(mp->m_sb);
|
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int readio_log, writeio_log;
|
|
|
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if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
|
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if (mp->m_flags & XFS_MOUNT_WSYNC) {
|
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readio_log = XFS_WSYNC_READIO_LOG;
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writeio_log = XFS_WSYNC_WRITEIO_LOG;
|
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} else {
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readio_log = XFS_READIO_LOG_LARGE;
|
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writeio_log = XFS_WRITEIO_LOG_LARGE;
|
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}
|
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} else {
|
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readio_log = mp->m_readio_log;
|
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writeio_log = mp->m_writeio_log;
|
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}
|
|
|
|
if (sbp->sb_blocklog > readio_log) {
|
|
mp->m_readio_log = sbp->sb_blocklog;
|
|
} else {
|
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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);
|
|
}
|
|
|
|
/*
|
|
* precalculate the low space thresholds for dynamic speculative preallocation.
|
|
*/
|
|
void
|
|
xfs_set_low_space_thresholds(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < XFS_LOWSP_MAX; i++) {
|
|
__uint64_t space = mp->m_sb.sb_dblocks;
|
|
|
|
do_div(space, 100);
|
|
mp->m_low_space[i] = space * (i + 1);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Set whether we're using inode alignment.
|
|
*/
|
|
STATIC void
|
|
xfs_set_inoalignment(xfs_mount_t *mp)
|
|
{
|
|
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) is an ok size.
|
|
*/
|
|
STATIC int
|
|
xfs_check_sizes(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_buf *bp;
|
|
xfs_daddr_t d;
|
|
int error;
|
|
|
|
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) {
|
|
xfs_warn(mp, "filesystem size mismatch detected");
|
|
return -EFBIG;
|
|
}
|
|
error = xfs_buf_read_uncached(mp->m_ddev_targp,
|
|
d - XFS_FSS_TO_BB(mp, 1),
|
|
XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
|
|
if (error) {
|
|
xfs_warn(mp, "last sector read failed");
|
|
return error;
|
|
}
|
|
xfs_buf_relse(bp);
|
|
|
|
if (mp->m_logdev_targp == mp->m_ddev_targp)
|
|
return 0;
|
|
|
|
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) {
|
|
xfs_warn(mp, "log size mismatch detected");
|
|
return -EFBIG;
|
|
}
|
|
error = xfs_buf_read_uncached(mp->m_logdev_targp,
|
|
d - XFS_FSB_TO_BB(mp, 1),
|
|
XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
|
|
if (error) {
|
|
xfs_warn(mp, "log device read failed");
|
|
return error;
|
|
}
|
|
xfs_buf_relse(bp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Clear the quotaflags in memory and in the superblock.
|
|
*/
|
|
int
|
|
xfs_mount_reset_sbqflags(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int error;
|
|
struct xfs_trans *tp;
|
|
|
|
mp->m_qflags = 0;
|
|
|
|
/*
|
|
* It is OK to look at sb_qflags here in mount path,
|
|
* without m_sb_lock.
|
|
*/
|
|
if (mp->m_sb.sb_qflags == 0)
|
|
return 0;
|
|
spin_lock(&mp->m_sb_lock);
|
|
mp->m_sb.sb_qflags = 0;
|
|
spin_unlock(&mp->m_sb_lock);
|
|
|
|
/*
|
|
* If the fs is readonly, let the incore superblock run
|
|
* with quotas off but don't flush the update out to disk
|
|
*/
|
|
if (mp->m_flags & XFS_MOUNT_RDONLY)
|
|
return 0;
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_sbchange, 0, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
xfs_alert(mp, "%s: Superblock update failed!", __func__);
|
|
return error;
|
|
}
|
|
|
|
xfs_mod_sb(tp, XFS_SB_QFLAGS);
|
|
return xfs_trans_commit(tp, 0);
|
|
}
|
|
|
|
__uint64_t
|
|
xfs_default_resblks(xfs_mount_t *mp)
|
|
{
|
|
__uint64_t resblks;
|
|
|
|
/*
|
|
* We default to 5% or 8192 fsbs of space reserved, whichever is
|
|
* smaller. This is intended to cover concurrent allocation
|
|
* transactions when we initially hit enospc. These each require a 4
|
|
* block reservation. Hence by default we cover roughly 2000 concurrent
|
|
* allocation reservations.
|
|
*/
|
|
resblks = mp->m_sb.sb_dblocks;
|
|
do_div(resblks, 20);
|
|
resblks = min_t(__uint64_t, resblks, 8192);
|
|
return resblks;
|
|
}
|
|
|
|
/*
|
|
* 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(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_sb_t *sbp = &(mp->m_sb);
|
|
xfs_inode_t *rip;
|
|
__uint64_t resblks;
|
|
uint quotamount = 0;
|
|
uint quotaflags = 0;
|
|
int error = 0;
|
|
|
|
xfs_sb_mount_common(mp, sbp);
|
|
|
|
/*
|
|
* Check for a mismatched features2 values. Older kernels
|
|
* read & wrote into the wrong sb offset for sb_features2
|
|
* on some platforms due to xfs_sb_t not being 64bit size aligned
|
|
* when sb_features2 was added, which made older superblock
|
|
* reading/writing routines swap it as a 64-bit value.
|
|
*
|
|
* For backwards compatibility, we make both slots equal.
|
|
*
|
|
* If we detect a mismatched field, we OR the set bits into the
|
|
* existing features2 field in case it has already been modified; we
|
|
* don't want to lose any features. We then update the bad location
|
|
* with the ORed value so that older kernels will see any features2
|
|
* flags, and mark the two fields as needing updates once the
|
|
* transaction subsystem is online.
|
|
*/
|
|
if (xfs_sb_has_mismatched_features2(sbp)) {
|
|
xfs_warn(mp, "correcting sb_features alignment problem");
|
|
sbp->sb_features2 |= sbp->sb_bad_features2;
|
|
sbp->sb_bad_features2 = sbp->sb_features2;
|
|
mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2;
|
|
|
|
/*
|
|
* Re-check for ATTR2 in case it was found in bad_features2
|
|
* slot.
|
|
*/
|
|
if (xfs_sb_version_hasattr2(&mp->m_sb) &&
|
|
!(mp->m_flags & XFS_MOUNT_NOATTR2))
|
|
mp->m_flags |= XFS_MOUNT_ATTR2;
|
|
}
|
|
|
|
if (xfs_sb_version_hasattr2(&mp->m_sb) &&
|
|
(mp->m_flags & XFS_MOUNT_NOATTR2)) {
|
|
xfs_sb_version_removeattr2(&mp->m_sb);
|
|
mp->m_update_flags |= XFS_SB_FEATURES2;
|
|
|
|
/* update sb_versionnum for the clearing of the morebits */
|
|
if (!sbp->sb_features2)
|
|
mp->m_update_flags |= XFS_SB_VERSIONNUM;
|
|
}
|
|
|
|
/* always use v2 inodes by default now */
|
|
if (!(mp->m_sb.sb_versionnum & XFS_SB_VERSION_NLINKBIT)) {
|
|
mp->m_sb.sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
|
|
mp->m_update_flags |= XFS_SB_VERSIONNUM;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
error = xfs_update_alignment(mp);
|
|
if (error)
|
|
goto out;
|
|
|
|
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);
|
|
|
|
xfs_set_maxicount(mp);
|
|
|
|
error = xfs_sysfs_init(&mp->m_kobj, &xfs_mp_ktype, NULL, mp->m_fsname);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = xfs_uuid_mount(mp);
|
|
if (error)
|
|
goto out_remove_sysfs;
|
|
|
|
/*
|
|
* Set the minimum read and write sizes
|
|
*/
|
|
xfs_set_rw_sizes(mp);
|
|
|
|
/* set the low space thresholds for dynamic preallocation */
|
|
xfs_set_low_space_thresholds(mp);
|
|
|
|
/*
|
|
* Set the inode cluster size.
|
|
* This may still be overridden by the file system
|
|
* block size if it is larger than the chosen cluster size.
|
|
*
|
|
* For v5 filesystems, scale the cluster size with the inode size to
|
|
* keep a constant ratio of inode per cluster buffer, but only if mkfs
|
|
* has set the inode alignment value appropriately for larger cluster
|
|
* sizes.
|
|
*/
|
|
mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;
|
|
if (xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
int new_size = mp->m_inode_cluster_size;
|
|
|
|
new_size *= mp->m_sb.sb_inodesize / XFS_DINODE_MIN_SIZE;
|
|
if (mp->m_sb.sb_inoalignmt >= XFS_B_TO_FSBT(mp, new_size))
|
|
mp->m_inode_cluster_size = new_size;
|
|
}
|
|
|
|
/*
|
|
* Set inode alignment fields
|
|
*/
|
|
xfs_set_inoalignment(mp);
|
|
|
|
/*
|
|
* Check that the data (and log if separate) is an ok size.
|
|
*/
|
|
error = xfs_check_sizes(mp);
|
|
if (error)
|
|
goto out_remove_uuid;
|
|
|
|
/*
|
|
* Initialize realtime fields in the mount structure
|
|
*/
|
|
error = xfs_rtmount_init(mp);
|
|
if (error) {
|
|
xfs_warn(mp, "RT mount failed");
|
|
goto out_remove_uuid;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
mp->m_dmevmask = 0; /* not persistent; set after each mount */
|
|
|
|
error = xfs_da_mount(mp);
|
|
if (error) {
|
|
xfs_warn(mp, "Failed dir/attr init: %d", error);
|
|
goto out_remove_uuid;
|
|
}
|
|
|
|
/*
|
|
* Initialize the precomputed transaction reservations values.
|
|
*/
|
|
xfs_trans_init(mp);
|
|
|
|
/*
|
|
* Allocate and initialize the per-ag data.
|
|
*/
|
|
spin_lock_init(&mp->m_perag_lock);
|
|
INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
|
|
error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
|
|
if (error) {
|
|
xfs_warn(mp, "Failed per-ag init: %d", error);
|
|
goto out_free_dir;
|
|
}
|
|
|
|
if (!sbp->sb_logblocks) {
|
|
xfs_warn(mp, "no log defined");
|
|
XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp);
|
|
error = -EFSCORRUPTED;
|
|
goto out_free_perag;
|
|
}
|
|
|
|
/*
|
|
* log's mount-time initialization. Perform 1st part recovery if needed
|
|
*/
|
|
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) {
|
|
xfs_warn(mp, "log mount failed");
|
|
goto out_fail_wait;
|
|
}
|
|
|
|
/*
|
|
* Now the log is mounted, we know if it was an unclean shutdown or
|
|
* not. If it was, with the first phase of recovery has completed, we
|
|
* have consistent AG blocks on disk. We have not recovered EFIs yet,
|
|
* but they are recovered transactionally in the second recovery phase
|
|
* later.
|
|
*
|
|
* Hence we can safely re-initialise incore superblock counters from
|
|
* the per-ag data. These may not be correct if the filesystem was not
|
|
* cleanly unmounted, so we need to wait for recovery to finish before
|
|
* doing this.
|
|
*
|
|
* If the filesystem was cleanly unmounted, then we can trust the
|
|
* values in the superblock to be correct and we don't need to do
|
|
* anything here.
|
|
*
|
|
* If we are currently making the filesystem, the initialisation will
|
|
* fail as the perag data is in an undefined state.
|
|
*/
|
|
if (xfs_sb_version_haslazysbcount(&mp->m_sb) &&
|
|
!XFS_LAST_UNMOUNT_WAS_CLEAN(mp) &&
|
|
!mp->m_sb.sb_inprogress) {
|
|
error = xfs_initialize_perag_data(mp, sbp->sb_agcount);
|
|
if (error)
|
|
goto out_log_dealloc;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
if (error) {
|
|
xfs_warn(mp, "failed to read root inode");
|
|
goto out_log_dealloc;
|
|
}
|
|
|
|
ASSERT(rip != NULL);
|
|
|
|
if (unlikely(!S_ISDIR(rip->i_d.di_mode))) {
|
|
xfs_warn(mp, "corrupted root inode %llu: not a directory",
|
|
(unsigned long long)rip->i_ino);
|
|
xfs_iunlock(rip, XFS_ILOCK_EXCL);
|
|
XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW,
|
|
mp);
|
|
error = -EFSCORRUPTED;
|
|
goto out_rele_rip;
|
|
}
|
|
mp->m_rootip = rip; /* save it */
|
|
|
|
xfs_iunlock(rip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* Initialize realtime inode pointers in the mount structure
|
|
*/
|
|
error = xfs_rtmount_inodes(mp);
|
|
if (error) {
|
|
/*
|
|
* Free up the root inode.
|
|
*/
|
|
xfs_warn(mp, "failed to read RT inodes");
|
|
goto out_rele_rip;
|
|
}
|
|
|
|
/*
|
|
* If this is a read-only mount defer the superblock updates until
|
|
* the next remount into writeable mode. Otherwise we would never
|
|
* perform the update e.g. for the root filesystem.
|
|
*/
|
|
if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) {
|
|
error = xfs_mount_log_sb(mp, mp->m_update_flags);
|
|
if (error) {
|
|
xfs_warn(mp, "failed to write sb changes");
|
|
goto out_rtunmount;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialise the XFS quota management subsystem for this mount
|
|
*/
|
|
if (XFS_IS_QUOTA_RUNNING(mp)) {
|
|
error = xfs_qm_newmount(mp, "amount, "aflags);
|
|
if (error)
|
|
goto out_rtunmount;
|
|
} else {
|
|
ASSERT(!XFS_IS_QUOTA_ON(mp));
|
|
|
|
/*
|
|
* If a file system had quotas running earlier, but decided to
|
|
* mount without -o uquota/pquota/gquota options, revoke the
|
|
* quotachecked license.
|
|
*/
|
|
if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) {
|
|
xfs_notice(mp, "resetting quota flags");
|
|
error = xfs_mount_reset_sbqflags(mp);
|
|
if (error)
|
|
goto out_rtunmount;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
if (error) {
|
|
xfs_warn(mp, "log mount finish failed");
|
|
goto out_rtunmount;
|
|
}
|
|
|
|
/*
|
|
* Complete the quota initialisation, post-log-replay component.
|
|
*/
|
|
if (quotamount) {
|
|
ASSERT(mp->m_qflags == 0);
|
|
mp->m_qflags = quotaflags;
|
|
|
|
xfs_qm_mount_quotas(mp);
|
|
}
|
|
|
|
/*
|
|
* Now we are mounted, reserve a small amount of unused space for
|
|
* privileged transactions. This is needed so that transaction
|
|
* space required for critical operations can dip into this pool
|
|
* when at ENOSPC. This is needed for operations like create with
|
|
* attr, unwritten extent conversion at ENOSPC, etc. Data allocations
|
|
* are not allowed to use this reserved space.
|
|
*
|
|
* This may drive us straight to ENOSPC on mount, but that implies
|
|
* we were already there on the last unmount. Warn if this occurs.
|
|
*/
|
|
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
|
|
resblks = xfs_default_resblks(mp);
|
|
error = xfs_reserve_blocks(mp, &resblks, NULL);
|
|
if (error)
|
|
xfs_warn(mp,
|
|
"Unable to allocate reserve blocks. Continuing without reserve pool.");
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_rtunmount:
|
|
xfs_rtunmount_inodes(mp);
|
|
out_rele_rip:
|
|
IRELE(rip);
|
|
out_log_dealloc:
|
|
xfs_log_unmount(mp);
|
|
out_fail_wait:
|
|
if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp)
|
|
xfs_wait_buftarg(mp->m_logdev_targp);
|
|
xfs_wait_buftarg(mp->m_ddev_targp);
|
|
out_free_perag:
|
|
xfs_free_perag(mp);
|
|
out_free_dir:
|
|
xfs_da_unmount(mp);
|
|
out_remove_uuid:
|
|
xfs_uuid_unmount(mp);
|
|
out_remove_sysfs:
|
|
xfs_sysfs_del(&mp->m_kobj);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* This flushes out the inodes,dquots and the superblock, unmounts the
|
|
* log and makes sure that incore structures are freed.
|
|
*/
|
|
void
|
|
xfs_unmountfs(
|
|
struct xfs_mount *mp)
|
|
{
|
|
__uint64_t resblks;
|
|
int error;
|
|
|
|
cancel_delayed_work_sync(&mp->m_eofblocks_work);
|
|
|
|
xfs_qm_unmount_quotas(mp);
|
|
xfs_rtunmount_inodes(mp);
|
|
IRELE(mp->m_rootip);
|
|
|
|
/*
|
|
* We can potentially deadlock here if we have an inode cluster
|
|
* that has been freed has its buffer still pinned in memory because
|
|
* the transaction is still sitting in a iclog. The stale inodes
|
|
* on that buffer will have their flush locks held until the
|
|
* transaction hits the disk and the callbacks run. the inode
|
|
* flush takes the flush lock unconditionally and with nothing to
|
|
* push out the iclog we will never get that unlocked. hence we
|
|
* need to force the log first.
|
|
*/
|
|
xfs_log_force(mp, XFS_LOG_SYNC);
|
|
|
|
/*
|
|
* Flush all pending changes from the AIL.
|
|
*/
|
|
xfs_ail_push_all_sync(mp->m_ail);
|
|
|
|
/*
|
|
* And reclaim all inodes. At this point there should be no dirty
|
|
* inodes and none should be pinned or locked, but use synchronous
|
|
* reclaim just to be sure. We can stop background inode reclaim
|
|
* here as well if it is still running.
|
|
*/
|
|
cancel_delayed_work_sync(&mp->m_reclaim_work);
|
|
xfs_reclaim_inodes(mp, SYNC_WAIT);
|
|
|
|
xfs_qm_unmount(mp);
|
|
|
|
/*
|
|
* Unreserve any blocks we have so that when we unmount we don't account
|
|
* the reserved free space as used. This is really only necessary for
|
|
* lazy superblock counting because it trusts the incore superblock
|
|
* counters to be absolutely correct on clean unmount.
|
|
*
|
|
* We don't bother correcting this elsewhere for lazy superblock
|
|
* counting because on mount of an unclean filesystem we reconstruct the
|
|
* correct counter value and this is irrelevant.
|
|
*
|
|
* For non-lazy counter filesystems, this doesn't matter at all because
|
|
* we only every apply deltas to the superblock and hence the incore
|
|
* value does not matter....
|
|
*/
|
|
resblks = 0;
|
|
error = xfs_reserve_blocks(mp, &resblks, NULL);
|
|
if (error)
|
|
xfs_warn(mp, "Unable to free reserved block pool. "
|
|
"Freespace may not be correct on next mount.");
|
|
|
|
error = xfs_log_sbcount(mp);
|
|
if (error)
|
|
xfs_warn(mp, "Unable to update superblock counters. "
|
|
"Freespace may not be correct on next mount.");
|
|
|
|
xfs_log_unmount(mp);
|
|
xfs_da_unmount(mp);
|
|
xfs_uuid_unmount(mp);
|
|
|
|
#if defined(DEBUG)
|
|
xfs_errortag_clearall(mp, 0);
|
|
#endif
|
|
xfs_free_perag(mp);
|
|
|
|
xfs_sysfs_del(&mp->m_kobj);
|
|
}
|
|
|
|
int
|
|
xfs_fs_writable(xfs_mount_t *mp)
|
|
{
|
|
return !(mp->m_super->s_writers.frozen || XFS_FORCED_SHUTDOWN(mp) ||
|
|
(mp->m_flags & XFS_MOUNT_RDONLY));
|
|
}
|
|
|
|
/*
|
|
* xfs_log_sbcount
|
|
*
|
|
* Sync the superblock counters to disk.
|
|
*
|
|
* Note this code can be called during the process of freezing, so
|
|
* we may need to use the transaction allocator which does not
|
|
* block when the transaction subsystem is in its frozen state.
|
|
*/
|
|
int
|
|
xfs_log_sbcount(xfs_mount_t *mp)
|
|
{
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
|
|
if (!xfs_fs_writable(mp))
|
|
return 0;
|
|
|
|
xfs_icsb_sync_counters(mp, 0);
|
|
|
|
/*
|
|
* we don't need to do this if we are updating the superblock
|
|
* counters on every modification.
|
|
*/
|
|
if (!xfs_sb_version_haslazysbcount(&mp->m_sb))
|
|
return 0;
|
|
|
|
tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP);
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS);
|
|
xfs_trans_set_sync(tp);
|
|
error = xfs_trans_commit(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_mod_incore_sb_unlocked() is a utility routine commonly 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 m_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,
|
|
int64_t 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 -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 -EINVAL;
|
|
}
|
|
mp->m_sb.sb_ifree = lcounter;
|
|
return 0;
|
|
case XFS_SBS_FDBLOCKS:
|
|
lcounter = (long long)
|
|
mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
|
|
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 (lcounter >= 0) {
|
|
mp->m_sb.sb_fdblocks = lcounter +
|
|
XFS_ALLOC_SET_ASIDE(mp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We are out of blocks, use any available reserved
|
|
* blocks if were allowed to.
|
|
*/
|
|
if (!rsvd)
|
|
return -ENOSPC;
|
|
|
|
lcounter = (long long)mp->m_resblks_avail + delta;
|
|
if (lcounter >= 0) {
|
|
mp->m_resblks_avail = lcounter;
|
|
return 0;
|
|
}
|
|
printk_once(KERN_WARNING
|
|
"Filesystem \"%s\": reserve blocks depleted! "
|
|
"Consider increasing reserve pool size.",
|
|
mp->m_fsname);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
|
|
return 0;
|
|
case XFS_SBS_FREXTENTS:
|
|
lcounter = (long long)mp->m_sb.sb_frextents;
|
|
lcounter += delta;
|
|
if (lcounter < 0) {
|
|
return -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 -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 -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 -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 -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 -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 -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 -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 -EINVAL;
|
|
}
|
|
mp->m_sb.sb_rextslog = scounter;
|
|
return 0;
|
|
default:
|
|
ASSERT(0);
|
|
return -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 m_sb_lock. Just use the xfs_mod_incore_sb_unlocked()
|
|
* routine to do the work.
|
|
*/
|
|
int
|
|
xfs_mod_incore_sb(
|
|
struct xfs_mount *mp,
|
|
xfs_sb_field_t field,
|
|
int64_t delta,
|
|
int rsvd)
|
|
{
|
|
int status;
|
|
|
|
#ifdef HAVE_PERCPU_SB
|
|
ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS);
|
|
#endif
|
|
spin_lock(&mp->m_sb_lock);
|
|
status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
|
|
spin_unlock(&mp->m_sb_lock);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Change more than one field in the in-core superblock structure at a time.
|
|
*
|
|
* 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.
|
|
*
|
|
* Note that this function may not be used for the superblock values that
|
|
* are tracked with the in-memory per-cpu counters - a direct call to
|
|
* xfs_icsb_modify_counters is required for these.
|
|
*/
|
|
int
|
|
xfs_mod_incore_sb_batch(
|
|
struct xfs_mount *mp,
|
|
xfs_mod_sb_t *msb,
|
|
uint nmsb,
|
|
int rsvd)
|
|
{
|
|
xfs_mod_sb_t *msbp;
|
|
int error = 0;
|
|
|
|
/*
|
|
* 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 m_sb_lock so that all of the
|
|
* changes will be atomic.
|
|
*/
|
|
spin_lock(&mp->m_sb_lock);
|
|
for (msbp = msb; msbp < (msb + nmsb); msbp++) {
|
|
ASSERT(msbp->msb_field < XFS_SBS_ICOUNT ||
|
|
msbp->msb_field > XFS_SBS_FDBLOCKS);
|
|
|
|
error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
|
|
msbp->msb_delta, rsvd);
|
|
if (error)
|
|
goto unwind;
|
|
}
|
|
spin_unlock(&mp->m_sb_lock);
|
|
return 0;
|
|
|
|
unwind:
|
|
while (--msbp >= msb) {
|
|
error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field,
|
|
-msbp->msb_delta, rsvd);
|
|
ASSERT(error == 0);
|
|
}
|
|
spin_unlock(&mp->m_sb_lock);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
struct xfs_buf *
|
|
xfs_getsb(
|
|
struct xfs_mount *mp,
|
|
int flags)
|
|
{
|
|
struct xfs_buf *bp = mp->m_sb_bp;
|
|
|
|
if (!xfs_buf_trylock(bp)) {
|
|
if (flags & XBF_TRYLOCK)
|
|
return NULL;
|
|
xfs_buf_lock(bp);
|
|
}
|
|
|
|
xfs_buf_hold(bp);
|
|
ASSERT(XFS_BUF_ISDONE(bp));
|
|
return bp;
|
|
}
|
|
|
|
/*
|
|
* Used to free the superblock along various error paths.
|
|
*/
|
|
void
|
|
xfs_freesb(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_buf *bp = mp->m_sb_bp;
|
|
|
|
xfs_buf_lock(bp);
|
|
mp->m_sb_bp = NULL;
|
|
xfs_buf_relse(bp);
|
|
}
|
|
|
|
/*
|
|
* Used to log changes to the superblock unit and width fields which could
|
|
* be altered by the mount options, as well as any potential sb_features2
|
|
* fixup. Only the first superblock is updated.
|
|
*/
|
|
int
|
|
xfs_mount_log_sb(
|
|
xfs_mount_t *mp,
|
|
__int64_t fields)
|
|
{
|
|
xfs_trans_t *tp;
|
|
int error;
|
|
|
|
ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID |
|
|
XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 |
|
|
XFS_SB_VERSIONNUM));
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
|
|
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_sb, 0, 0);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return error;
|
|
}
|
|
xfs_mod_sb(tp, fields);
|
|
error = xfs_trans_commit(tp, 0);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* If the underlying (data/log/rt) device is readonly, there are some
|
|
* operations that cannot proceed.
|
|
*/
|
|
int
|
|
xfs_dev_is_read_only(
|
|
struct xfs_mount *mp,
|
|
char *message)
|
|
{
|
|
if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
|
|
xfs_readonly_buftarg(mp->m_logdev_targp) ||
|
|
(mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
|
|
xfs_notice(mp, "%s required on read-only device.", message);
|
|
xfs_notice(mp, "write access unavailable, cannot proceed.");
|
|
return -EROFS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_PERCPU_SB
|
|
/*
|
|
* Per-cpu incore superblock counters
|
|
*
|
|
* Simple concept, difficult implementation
|
|
*
|
|
* Basically, replace the incore superblock counters with a distributed per cpu
|
|
* counter for contended fields (e.g. free block count).
|
|
*
|
|
* Difficulties arise in that the incore sb is used for ENOSPC checking, and
|
|
* hence needs to be accurately read when we are running low on space. Hence
|
|
* there is a method to enable and disable the per-cpu counters based on how
|
|
* much "stuff" is available in them.
|
|
*
|
|
* Basically, a counter is enabled if there is enough free resource to justify
|
|
* running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local
|
|
* ENOSPC), then we disable the counters to synchronise all callers and
|
|
* re-distribute the available resources.
|
|
*
|
|
* If, once we redistributed the available resources, we still get a failure,
|
|
* we disable the per-cpu counter and go through the slow path.
|
|
*
|
|
* The slow path is the current xfs_mod_incore_sb() function. This means that
|
|
* when we disable a per-cpu counter, we need to drain its resources back to
|
|
* the global superblock. We do this after disabling the counter to prevent
|
|
* more threads from queueing up on the counter.
|
|
*
|
|
* Essentially, this means that we still need a lock in the fast path to enable
|
|
* synchronisation between the global counters and the per-cpu counters. This
|
|
* is not a problem because the lock will be local to a CPU almost all the time
|
|
* and have little contention except when we get to ENOSPC conditions.
|
|
*
|
|
* Basically, this lock becomes a barrier that enables us to lock out the fast
|
|
* path while we do things like enabling and disabling counters and
|
|
* synchronising the counters.
|
|
*
|
|
* Locking rules:
|
|
*
|
|
* 1. m_sb_lock before picking up per-cpu locks
|
|
* 2. per-cpu locks always picked up via for_each_online_cpu() order
|
|
* 3. accurate counter sync requires m_sb_lock + per cpu locks
|
|
* 4. modifying per-cpu counters requires holding per-cpu lock
|
|
* 5. modifying global counters requires holding m_sb_lock
|
|
* 6. enabling or disabling a counter requires holding the m_sb_lock
|
|
* and _none_ of the per-cpu locks.
|
|
*
|
|
* Disabled counters are only ever re-enabled by a balance operation
|
|
* that results in more free resources per CPU than a given threshold.
|
|
* To ensure counters don't remain disabled, they are rebalanced when
|
|
* the global resource goes above a higher threshold (i.e. some hysteresis
|
|
* is present to prevent thrashing).
|
|
*/
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/*
|
|
* hot-plug CPU notifier support.
|
|
*
|
|
* We need a notifier per filesystem as we need to be able to identify
|
|
* the filesystem to balance the counters out. This is achieved by
|
|
* having a notifier block embedded in the xfs_mount_t and doing pointer
|
|
* magic to get the mount pointer from the notifier block address.
|
|
*/
|
|
STATIC int
|
|
xfs_icsb_cpu_notify(
|
|
struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *hcpu)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
xfs_mount_t *mp;
|
|
|
|
mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier);
|
|
cntp = (xfs_icsb_cnts_t *)
|
|
per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu);
|
|
switch (action) {
|
|
case CPU_UP_PREPARE:
|
|
case CPU_UP_PREPARE_FROZEN:
|
|
/* Easy Case - initialize the area and locks, and
|
|
* then rebalance when online does everything else for us. */
|
|
memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
|
|
break;
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
xfs_icsb_lock(mp);
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
|
|
xfs_icsb_unlock(mp);
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
/* Disable all the counters, then fold the dead cpu's
|
|
* count into the total on the global superblock and
|
|
* re-enable the counters. */
|
|
xfs_icsb_lock(mp);
|
|
spin_lock(&mp->m_sb_lock);
|
|
xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT);
|
|
xfs_icsb_disable_counter(mp, XFS_SBS_IFREE);
|
|
xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS);
|
|
|
|
mp->m_sb.sb_icount += cntp->icsb_icount;
|
|
mp->m_sb.sb_ifree += cntp->icsb_ifree;
|
|
mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks;
|
|
|
|
memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
|
|
|
|
xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0);
|
|
xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0);
|
|
xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0);
|
|
spin_unlock(&mp->m_sb_lock);
|
|
xfs_icsb_unlock(mp);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
int
|
|
xfs_icsb_init_counters(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
int i;
|
|
|
|
mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t);
|
|
if (mp->m_sb_cnts == NULL)
|
|
return -ENOMEM;
|
|
|
|
for_each_online_cpu(i) {
|
|
cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
|
|
memset(cntp, 0, sizeof(xfs_icsb_cnts_t));
|
|
}
|
|
|
|
mutex_init(&mp->m_icsb_mutex);
|
|
|
|
/*
|
|
* start with all counters disabled so that the
|
|
* initial balance kicks us off correctly
|
|
*/
|
|
mp->m_icsb_counters = -1;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify;
|
|
mp->m_icsb_notifier.priority = 0;
|
|
register_hotcpu_notifier(&mp->m_icsb_notifier);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
xfs_icsb_reinit_counters(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_icsb_lock(mp);
|
|
/*
|
|
* start with all counters disabled so that the
|
|
* initial balance kicks us off correctly
|
|
*/
|
|
mp->m_icsb_counters = -1;
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0);
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0);
|
|
xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0);
|
|
xfs_icsb_unlock(mp);
|
|
}
|
|
|
|
void
|
|
xfs_icsb_destroy_counters(
|
|
xfs_mount_t *mp)
|
|
{
|
|
if (mp->m_sb_cnts) {
|
|
unregister_hotcpu_notifier(&mp->m_icsb_notifier);
|
|
free_percpu(mp->m_sb_cnts);
|
|
}
|
|
mutex_destroy(&mp->m_icsb_mutex);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_lock_cntr(
|
|
xfs_icsb_cnts_t *icsbp)
|
|
{
|
|
while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) {
|
|
ndelay(1000);
|
|
}
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_unlock_cntr(
|
|
xfs_icsb_cnts_t *icsbp)
|
|
{
|
|
clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags);
|
|
}
|
|
|
|
|
|
STATIC void
|
|
xfs_icsb_lock_all_counters(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
int i;
|
|
|
|
for_each_online_cpu(i) {
|
|
cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
|
|
xfs_icsb_lock_cntr(cntp);
|
|
}
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_unlock_all_counters(
|
|
xfs_mount_t *mp)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
int i;
|
|
|
|
for_each_online_cpu(i) {
|
|
cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
|
|
xfs_icsb_unlock_cntr(cntp);
|
|
}
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_count(
|
|
xfs_mount_t *mp,
|
|
xfs_icsb_cnts_t *cnt,
|
|
int flags)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
int i;
|
|
|
|
memset(cnt, 0, sizeof(xfs_icsb_cnts_t));
|
|
|
|
if (!(flags & XFS_ICSB_LAZY_COUNT))
|
|
xfs_icsb_lock_all_counters(mp);
|
|
|
|
for_each_online_cpu(i) {
|
|
cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i);
|
|
cnt->icsb_icount += cntp->icsb_icount;
|
|
cnt->icsb_ifree += cntp->icsb_ifree;
|
|
cnt->icsb_fdblocks += cntp->icsb_fdblocks;
|
|
}
|
|
|
|
if (!(flags & XFS_ICSB_LAZY_COUNT))
|
|
xfs_icsb_unlock_all_counters(mp);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_icsb_counter_disabled(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t field)
|
|
{
|
|
ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
|
|
return test_bit(field, &mp->m_icsb_counters);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_disable_counter(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t field)
|
|
{
|
|
xfs_icsb_cnts_t cnt;
|
|
|
|
ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
|
|
|
|
/*
|
|
* If we are already disabled, then there is nothing to do
|
|
* here. We check before locking all the counters to avoid
|
|
* the expensive lock operation when being called in the
|
|
* slow path and the counter is already disabled. This is
|
|
* safe because the only time we set or clear this state is under
|
|
* the m_icsb_mutex.
|
|
*/
|
|
if (xfs_icsb_counter_disabled(mp, field))
|
|
return;
|
|
|
|
xfs_icsb_lock_all_counters(mp);
|
|
if (!test_and_set_bit(field, &mp->m_icsb_counters)) {
|
|
/* drain back to superblock */
|
|
|
|
xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT);
|
|
switch(field) {
|
|
case XFS_SBS_ICOUNT:
|
|
mp->m_sb.sb_icount = cnt.icsb_icount;
|
|
break;
|
|
case XFS_SBS_IFREE:
|
|
mp->m_sb.sb_ifree = cnt.icsb_ifree;
|
|
break;
|
|
case XFS_SBS_FDBLOCKS:
|
|
mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
xfs_icsb_unlock_all_counters(mp);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_enable_counter(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t field,
|
|
uint64_t count,
|
|
uint64_t resid)
|
|
{
|
|
xfs_icsb_cnts_t *cntp;
|
|
int i;
|
|
|
|
ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS));
|
|
|
|
xfs_icsb_lock_all_counters(mp);
|
|
for_each_online_cpu(i) {
|
|
cntp = per_cpu_ptr(mp->m_sb_cnts, i);
|
|
switch (field) {
|
|
case XFS_SBS_ICOUNT:
|
|
cntp->icsb_icount = count + resid;
|
|
break;
|
|
case XFS_SBS_IFREE:
|
|
cntp->icsb_ifree = count + resid;
|
|
break;
|
|
case XFS_SBS_FDBLOCKS:
|
|
cntp->icsb_fdblocks = count + resid;
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
resid = 0;
|
|
}
|
|
clear_bit(field, &mp->m_icsb_counters);
|
|
xfs_icsb_unlock_all_counters(mp);
|
|
}
|
|
|
|
void
|
|
xfs_icsb_sync_counters_locked(
|
|
xfs_mount_t *mp,
|
|
int flags)
|
|
{
|
|
xfs_icsb_cnts_t cnt;
|
|
|
|
xfs_icsb_count(mp, &cnt, flags);
|
|
|
|
if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT))
|
|
mp->m_sb.sb_icount = cnt.icsb_icount;
|
|
if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE))
|
|
mp->m_sb.sb_ifree = cnt.icsb_ifree;
|
|
if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS))
|
|
mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks;
|
|
}
|
|
|
|
/*
|
|
* Accurate update of per-cpu counters to incore superblock
|
|
*/
|
|
void
|
|
xfs_icsb_sync_counters(
|
|
xfs_mount_t *mp,
|
|
int flags)
|
|
{
|
|
spin_lock(&mp->m_sb_lock);
|
|
xfs_icsb_sync_counters_locked(mp, flags);
|
|
spin_unlock(&mp->m_sb_lock);
|
|
}
|
|
|
|
/*
|
|
* Balance and enable/disable counters as necessary.
|
|
*
|
|
* Thresholds for re-enabling counters are somewhat magic. inode counts are
|
|
* chosen to be the same number as single on disk allocation chunk per CPU, and
|
|
* free blocks is something far enough zero that we aren't going thrash when we
|
|
* get near ENOSPC. We also need to supply a minimum we require per cpu to
|
|
* prevent looping endlessly when xfs_alloc_space asks for more than will
|
|
* be distributed to a single CPU but each CPU has enough blocks to be
|
|
* reenabled.
|
|
*
|
|
* Note that we can be called when counters are already disabled.
|
|
* xfs_icsb_disable_counter() optimises the counter locking in this case to
|
|
* prevent locking every per-cpu counter needlessly.
|
|
*/
|
|
|
|
#define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64
|
|
#define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \
|
|
(uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp))
|
|
STATIC void
|
|
xfs_icsb_balance_counter_locked(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t field,
|
|
int min_per_cpu)
|
|
{
|
|
uint64_t count, resid;
|
|
int weight = num_online_cpus();
|
|
uint64_t min = (uint64_t)min_per_cpu;
|
|
|
|
/* disable counter and sync counter */
|
|
xfs_icsb_disable_counter(mp, field);
|
|
|
|
/* update counters - first CPU gets residual*/
|
|
switch (field) {
|
|
case XFS_SBS_ICOUNT:
|
|
count = mp->m_sb.sb_icount;
|
|
resid = do_div(count, weight);
|
|
if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
|
|
return;
|
|
break;
|
|
case XFS_SBS_IFREE:
|
|
count = mp->m_sb.sb_ifree;
|
|
resid = do_div(count, weight);
|
|
if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE))
|
|
return;
|
|
break;
|
|
case XFS_SBS_FDBLOCKS:
|
|
count = mp->m_sb.sb_fdblocks;
|
|
resid = do_div(count, weight);
|
|
if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp)))
|
|
return;
|
|
break;
|
|
default:
|
|
BUG();
|
|
count = resid = 0; /* quiet, gcc */
|
|
break;
|
|
}
|
|
|
|
xfs_icsb_enable_counter(mp, field, count, resid);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_icsb_balance_counter(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t fields,
|
|
int min_per_cpu)
|
|
{
|
|
spin_lock(&mp->m_sb_lock);
|
|
xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu);
|
|
spin_unlock(&mp->m_sb_lock);
|
|
}
|
|
|
|
int
|
|
xfs_icsb_modify_counters(
|
|
xfs_mount_t *mp,
|
|
xfs_sb_field_t field,
|
|
int64_t delta,
|
|
int rsvd)
|
|
{
|
|
xfs_icsb_cnts_t *icsbp;
|
|
long long lcounter; /* long counter for 64 bit fields */
|
|
int ret = 0;
|
|
|
|
might_sleep();
|
|
again:
|
|
preempt_disable();
|
|
icsbp = this_cpu_ptr(mp->m_sb_cnts);
|
|
|
|
/*
|
|
* if the counter is disabled, go to slow path
|
|
*/
|
|
if (unlikely(xfs_icsb_counter_disabled(mp, field)))
|
|
goto slow_path;
|
|
xfs_icsb_lock_cntr(icsbp);
|
|
if (unlikely(xfs_icsb_counter_disabled(mp, field))) {
|
|
xfs_icsb_unlock_cntr(icsbp);
|
|
goto slow_path;
|
|
}
|
|
|
|
switch (field) {
|
|
case XFS_SBS_ICOUNT:
|
|
lcounter = icsbp->icsb_icount;
|
|
lcounter += delta;
|
|
if (unlikely(lcounter < 0))
|
|
goto balance_counter;
|
|
icsbp->icsb_icount = lcounter;
|
|
break;
|
|
|
|
case XFS_SBS_IFREE:
|
|
lcounter = icsbp->icsb_ifree;
|
|
lcounter += delta;
|
|
if (unlikely(lcounter < 0))
|
|
goto balance_counter;
|
|
icsbp->icsb_ifree = lcounter;
|
|
break;
|
|
|
|
case XFS_SBS_FDBLOCKS:
|
|
BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0);
|
|
|
|
lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
|
|
lcounter += delta;
|
|
if (unlikely(lcounter < 0))
|
|
goto balance_counter;
|
|
icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
xfs_icsb_unlock_cntr(icsbp);
|
|
preempt_enable();
|
|
return 0;
|
|
|
|
slow_path:
|
|
preempt_enable();
|
|
|
|
/*
|
|
* serialise with a mutex so we don't burn lots of cpu on
|
|
* the superblock lock. We still need to hold the superblock
|
|
* lock, however, when we modify the global structures.
|
|
*/
|
|
xfs_icsb_lock(mp);
|
|
|
|
/*
|
|
* Now running atomically.
|
|
*
|
|
* If the counter is enabled, someone has beaten us to rebalancing.
|
|
* Drop the lock and try again in the fast path....
|
|
*/
|
|
if (!(xfs_icsb_counter_disabled(mp, field))) {
|
|
xfs_icsb_unlock(mp);
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* The counter is currently disabled. Because we are
|
|
* running atomically here, we know a rebalance cannot
|
|
* be in progress. Hence we can go straight to operating
|
|
* on the global superblock. We do not call xfs_mod_incore_sb()
|
|
* here even though we need to get the m_sb_lock. Doing so
|
|
* will cause us to re-enter this function and deadlock.
|
|
* Hence we get the m_sb_lock ourselves and then call
|
|
* xfs_mod_incore_sb_unlocked() as the unlocked path operates
|
|
* directly on the global counters.
|
|
*/
|
|
spin_lock(&mp->m_sb_lock);
|
|
ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
|
|
spin_unlock(&mp->m_sb_lock);
|
|
|
|
/*
|
|
* Now that we've modified the global superblock, we
|
|
* may be able to re-enable the distributed counters
|
|
* (e.g. lots of space just got freed). After that
|
|
* we are done.
|
|
*/
|
|
if (ret != -ENOSPC)
|
|
xfs_icsb_balance_counter(mp, field, 0);
|
|
xfs_icsb_unlock(mp);
|
|
return ret;
|
|
|
|
balance_counter:
|
|
xfs_icsb_unlock_cntr(icsbp);
|
|
preempt_enable();
|
|
|
|
/*
|
|
* We may have multiple threads here if multiple per-cpu
|
|
* counters run dry at the same time. This will mean we can
|
|
* do more balances than strictly necessary but it is not
|
|
* the common slowpath case.
|
|
*/
|
|
xfs_icsb_lock(mp);
|
|
|
|
/*
|
|
* running atomically.
|
|
*
|
|
* This will leave the counter in the correct state for future
|
|
* accesses. After the rebalance, we simply try again and our retry
|
|
* will either succeed through the fast path or slow path without
|
|
* another balance operation being required.
|
|
*/
|
|
xfs_icsb_balance_counter(mp, field, delta);
|
|
xfs_icsb_unlock(mp);
|
|
goto again;
|
|
}
|
|
|
|
#endif
|