mirror of https://gitee.com/openkylin/linux.git
750 lines
20 KiB
C
750 lines
20 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* ocfs2.h
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*
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* Defines macros and structures used in OCFS2
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*
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* Copyright (C) 2002, 2004 Oracle. 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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_H
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#define OCFS2_H
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/rbtree.h>
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#include <linux/workqueue.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/lockdep.h>
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#ifndef CONFIG_OCFS2_COMPAT_JBD
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# include <linux/jbd2.h>
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#else
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# include <linux/jbd.h>
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# include "ocfs2_jbd_compat.h"
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#endif
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/* For union ocfs2_dlm_lksb */
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#include "stackglue.h"
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#include "ocfs2_fs.h"
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#include "ocfs2_lockid.h"
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/* For struct ocfs2_blockcheck_stats */
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#include "blockcheck.h"
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/* Most user visible OCFS2 inodes will have very few pieces of
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* metadata, but larger files (including bitmaps, etc) must be taken
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* into account when designing an access scheme. We allow a small
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* amount of inlined blocks to be stored on an array and grow the
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* structure into a rb tree when necessary. */
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#define OCFS2_INODE_MAX_CACHE_ARRAY 2
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struct ocfs2_caching_info {
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unsigned int ci_num_cached;
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union {
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sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
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struct rb_root ci_tree;
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} ci_cache;
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};
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/* this limits us to 256 nodes
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* if we need more, we can do a kmalloc for the map */
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#define OCFS2_NODE_MAP_MAX_NODES 256
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struct ocfs2_node_map {
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u16 num_nodes;
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unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
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};
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enum ocfs2_ast_action {
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OCFS2_AST_INVALID = 0,
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OCFS2_AST_ATTACH,
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OCFS2_AST_CONVERT,
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OCFS2_AST_DOWNCONVERT,
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};
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/* actions for an unlockast function to take. */
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enum ocfs2_unlock_action {
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OCFS2_UNLOCK_INVALID = 0,
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OCFS2_UNLOCK_CANCEL_CONVERT,
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OCFS2_UNLOCK_DROP_LOCK,
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};
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/* ocfs2_lock_res->l_flags flags. */
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#define OCFS2_LOCK_ATTACHED (0x00000001) /* we have initialized
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* the lvb */
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#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
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* dlm_lock */
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#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
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* downconvert*/
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#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
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#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
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#define OCFS2_LOCK_REFRESHING (0x00000020)
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#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
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* for shutdown paths */
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#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
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* when to skip queueing
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* a lock because it's
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* about to be
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* dropped. */
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#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
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#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
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#define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
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call to dlm_lock. Only
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exists with BUSY set. */
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struct ocfs2_lock_res_ops;
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typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
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struct ocfs2_lock_res {
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void *l_priv;
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struct ocfs2_lock_res_ops *l_ops;
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spinlock_t l_lock;
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struct list_head l_blocked_list;
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struct list_head l_mask_waiters;
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enum ocfs2_lock_type l_type;
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unsigned long l_flags;
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char l_name[OCFS2_LOCK_ID_MAX_LEN];
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int l_level;
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unsigned int l_ro_holders;
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unsigned int l_ex_holders;
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union ocfs2_dlm_lksb l_lksb;
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/* used from AST/BAST funcs. */
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enum ocfs2_ast_action l_action;
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enum ocfs2_unlock_action l_unlock_action;
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int l_requested;
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int l_blocking;
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unsigned int l_pending_gen;
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wait_queue_head_t l_event;
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struct list_head l_debug_list;
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#ifdef CONFIG_OCFS2_FS_STATS
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unsigned long long l_lock_num_prmode; /* PR acquires */
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unsigned long long l_lock_num_exmode; /* EX acquires */
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unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
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unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
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unsigned long long l_lock_total_prmode; /* Tot wait for PR */
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unsigned long long l_lock_total_exmode; /* Tot wait for EX */
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unsigned int l_lock_max_prmode; /* Max wait for PR */
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unsigned int l_lock_max_exmode; /* Max wait for EX */
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unsigned int l_lock_refresh; /* Disk refreshes */
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map l_lockdep_map;
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#endif
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};
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enum ocfs2_orphan_scan_state {
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ORPHAN_SCAN_ACTIVE,
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ORPHAN_SCAN_INACTIVE
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};
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struct ocfs2_orphan_scan {
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struct mutex os_lock;
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struct ocfs2_super *os_osb;
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struct ocfs2_lock_res os_lockres; /* lock to synchronize scans */
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struct delayed_work os_orphan_scan_work;
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struct timespec os_scantime; /* time this node ran the scan */
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u32 os_count; /* tracks node specific scans */
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u32 os_seqno; /* tracks cluster wide scans */
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atomic_t os_state; /* ACTIVE or INACTIVE */
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};
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struct ocfs2_dlm_debug {
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struct kref d_refcnt;
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struct dentry *d_locking_state;
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struct list_head d_lockres_tracking;
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};
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enum ocfs2_vol_state
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{
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VOLUME_INIT = 0,
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VOLUME_MOUNTED,
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VOLUME_MOUNTED_QUOTAS,
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VOLUME_DISMOUNTED,
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VOLUME_DISABLED
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};
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struct ocfs2_alloc_stats
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{
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atomic_t moves;
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atomic_t local_data;
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atomic_t bitmap_data;
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atomic_t bg_allocs;
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atomic_t bg_extends;
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};
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enum ocfs2_local_alloc_state
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{
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OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
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* this mountpoint. */
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OCFS2_LA_ENABLED, /* Local alloc is in use. */
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OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
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* of bits has been reduced. */
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OCFS2_LA_DISABLED /* Local alloc has temporarily been
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* disabled. */
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};
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enum ocfs2_mount_options
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{
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OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
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OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
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OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
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OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
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OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
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OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
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OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
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OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
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OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* POSIX access control lists */
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OCFS2_MOUNT_USRQUOTA = 1 << 9, /* We support user quotas */
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OCFS2_MOUNT_GRPQUOTA = 1 << 10, /* We support group quotas */
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};
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#define OCFS2_OSB_SOFT_RO 0x0001
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#define OCFS2_OSB_HARD_RO 0x0002
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#define OCFS2_OSB_ERROR_FS 0x0004
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#define OCFS2_OSB_DROP_DENTRY_LOCK_IMMED 0x0008
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#define OCFS2_DEFAULT_ATIME_QUANTUM 60
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struct ocfs2_journal;
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struct ocfs2_slot_info;
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struct ocfs2_recovery_map;
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struct ocfs2_replay_map;
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struct ocfs2_quota_recovery;
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struct ocfs2_dentry_lock;
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struct ocfs2_super
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{
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struct task_struct *commit_task;
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struct super_block *sb;
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struct inode *root_inode;
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struct inode *sys_root_inode;
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struct inode *system_inodes[NUM_SYSTEM_INODES];
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struct ocfs2_slot_info *slot_info;
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u32 *slot_recovery_generations;
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spinlock_t node_map_lock;
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u64 root_blkno;
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u64 system_dir_blkno;
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u64 bitmap_blkno;
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u32 bitmap_cpg;
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u8 *uuid;
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char *uuid_str;
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u32 uuid_hash;
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u8 *vol_label;
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u64 first_cluster_group_blkno;
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u32 fs_generation;
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u32 s_feature_compat;
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u32 s_feature_incompat;
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u32 s_feature_ro_compat;
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/* Protects s_next_generation, osb_flags and s_inode_steal_slot.
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* Could protect more on osb as it's very short lived.
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*/
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spinlock_t osb_lock;
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u32 s_next_generation;
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unsigned long osb_flags;
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s16 s_inode_steal_slot;
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atomic_t s_num_inodes_stolen;
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unsigned long s_mount_opt;
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unsigned int s_atime_quantum;
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unsigned int max_slots;
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unsigned int node_num;
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int slot_num;
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int preferred_slot;
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int s_sectsize_bits;
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int s_clustersize;
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int s_clustersize_bits;
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unsigned int s_xattr_inline_size;
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atomic_t vol_state;
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struct mutex recovery_lock;
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struct ocfs2_recovery_map *recovery_map;
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struct ocfs2_replay_map *replay_map;
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struct task_struct *recovery_thread_task;
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int disable_recovery;
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wait_queue_head_t checkpoint_event;
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atomic_t needs_checkpoint;
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struct ocfs2_journal *journal;
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unsigned long osb_commit_interval;
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struct delayed_work la_enable_wq;
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/*
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* Must hold local alloc i_mutex and osb->osb_lock to change
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* local_alloc_bits. Reads can be done under either lock.
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*/
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unsigned int local_alloc_bits;
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unsigned int local_alloc_default_bits;
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enum ocfs2_local_alloc_state local_alloc_state; /* protected
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* by osb_lock */
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struct buffer_head *local_alloc_bh;
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u64 la_last_gd;
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/* Next three fields are for local node slot recovery during
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* mount. */
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int dirty;
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struct ocfs2_dinode *local_alloc_copy;
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struct ocfs2_quota_recovery *quota_rec;
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struct ocfs2_blockcheck_stats osb_ecc_stats;
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struct ocfs2_alloc_stats alloc_stats;
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char dev_str[20]; /* "major,minor" of the device */
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char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
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struct ocfs2_cluster_connection *cconn;
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struct ocfs2_lock_res osb_super_lockres;
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struct ocfs2_lock_res osb_rename_lockres;
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struct ocfs2_lock_res osb_nfs_sync_lockres;
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struct ocfs2_dlm_debug *osb_dlm_debug;
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struct dentry *osb_debug_root;
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struct dentry *osb_ctxt;
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wait_queue_head_t recovery_event;
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spinlock_t dc_task_lock;
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struct task_struct *dc_task;
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wait_queue_head_t dc_event;
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unsigned long dc_wake_sequence;
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unsigned long dc_work_sequence;
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/*
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* Any thread can add locks to the list, but the downconvert
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* thread is the only one allowed to remove locks. Any change
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* to this rule requires updating
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* ocfs2_downconvert_thread_do_work().
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*/
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struct list_head blocked_lock_list;
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unsigned long blocked_lock_count;
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/* List of dentry locks to release. Anyone can add locks to
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* the list, ocfs2_wq processes the list */
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struct ocfs2_dentry_lock *dentry_lock_list;
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struct work_struct dentry_lock_work;
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wait_queue_head_t osb_mount_event;
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/* Truncate log info */
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struct inode *osb_tl_inode;
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struct buffer_head *osb_tl_bh;
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struct delayed_work osb_truncate_log_wq;
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struct ocfs2_node_map osb_recovering_orphan_dirs;
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unsigned int *osb_orphan_wipes;
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wait_queue_head_t osb_wipe_event;
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struct ocfs2_orphan_scan osb_orphan_scan;
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/* used to protect metaecc calculation check of xattr. */
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spinlock_t osb_xattr_lock;
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unsigned int osb_dx_mask;
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u32 osb_dx_seed[4];
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/* the group we used to allocate inodes. */
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u64 osb_inode_alloc_group;
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};
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#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
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/* Useful typedef for passing around journal access functions */
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typedef int (*ocfs2_journal_access_func)(handle_t *handle, struct inode *inode,
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struct buffer_head *bh, int type);
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static inline int ocfs2_should_order_data(struct inode *inode)
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{
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
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return 0;
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return 1;
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}
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static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
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{
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if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
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return 1;
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return 0;
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}
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static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
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{
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/*
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* Support for sparse files is a pre-requisite
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*/
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if (!ocfs2_sparse_alloc(osb))
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return 0;
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if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
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return 1;
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return 0;
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}
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static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
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{
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if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
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return 1;
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return 0;
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}
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static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
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{
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if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
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return 1;
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return 0;
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}
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static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
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{
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if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
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return 1;
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return 0;
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}
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static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
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{
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if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
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return 1;
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return 0;
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}
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static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
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{
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if (ocfs2_supports_indexed_dirs(osb))
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return OCFS2_DX_LINK_MAX;
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return OCFS2_LINK_MAX;
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}
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static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
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{
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u32 nlink = le16_to_cpu(di->i_links_count);
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u32 hi = le16_to_cpu(di->i_links_count_hi);
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if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
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nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
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return nlink;
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}
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static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
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{
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u16 lo, hi;
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lo = nlink;
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hi = nlink >> OCFS2_LINKS_HI_SHIFT;
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di->i_links_count = cpu_to_le16(lo);
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di->i_links_count_hi = cpu_to_le16(hi);
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}
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static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
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{
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u32 links = ocfs2_read_links_count(di);
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links += n;
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ocfs2_set_links_count(di, links);
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}
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/* set / clear functions because cluster events can make these happen
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* in parallel so we want the transitions to be atomic. this also
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* means that any future flags osb_flags must be protected by spinlock
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* too! */
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static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
|
|
unsigned long flag)
|
|
{
|
|
spin_lock(&osb->osb_lock);
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|
osb->osb_flags |= flag;
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|
spin_unlock(&osb->osb_lock);
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|
}
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|
|
|
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static inline unsigned long ocfs2_test_osb_flag(struct ocfs2_super *osb,
|
|
unsigned long flag)
|
|
{
|
|
unsigned long ret;
|
|
|
|
spin_lock(&osb->osb_lock);
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|
ret = osb->osb_flags & flag;
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|
spin_unlock(&osb->osb_lock);
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|
return ret;
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|
}
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|
|
|
static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
|
|
int hard)
|
|
{
|
|
spin_lock(&osb->osb_lock);
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|
osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
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if (hard)
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|
osb->osb_flags |= OCFS2_OSB_HARD_RO;
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else
|
|
osb->osb_flags |= OCFS2_OSB_SOFT_RO;
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|
spin_unlock(&osb->osb_lock);
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|
}
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|
|
|
static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock(&osb->osb_lock);
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|
ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
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|
spin_unlock(&osb->osb_lock);
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|
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock(&osb->osb_lock);
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|
ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
|
|
spin_unlock(&osb->osb_lock);
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|
|
|
return ret;
|
|
}
|
|
|
|
static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
|
|
{
|
|
return (osb->s_feature_incompat &
|
|
OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK);
|
|
}
|
|
|
|
static inline int ocfs2_mount_local(struct ocfs2_super *osb)
|
|
{
|
|
return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);
|
|
}
|
|
|
|
static inline int ocfs2_uses_extended_slot_map(struct ocfs2_super *osb)
|
|
{
|
|
return (osb->s_feature_incompat &
|
|
OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
|
|
}
|
|
|
|
|
|
#define OCFS2_IS_VALID_DINODE(ptr) \
|
|
(!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
|
|
|
|
#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
|
|
(!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
|
|
|
|
#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
|
|
(!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
|
|
|
|
|
|
#define OCFS2_IS_VALID_XATTR_BLOCK(ptr) \
|
|
(!strcmp((ptr)->xb_signature, OCFS2_XATTR_BLOCK_SIGNATURE))
|
|
|
|
#define OCFS2_IS_VALID_DIR_TRAILER(ptr) \
|
|
(!strcmp((ptr)->db_signature, OCFS2_DIR_TRAILER_SIGNATURE))
|
|
|
|
#define OCFS2_IS_VALID_DX_ROOT(ptr) \
|
|
(!strcmp((ptr)->dr_signature, OCFS2_DX_ROOT_SIGNATURE))
|
|
|
|
#define OCFS2_IS_VALID_DX_LEAF(ptr) \
|
|
(!strcmp((ptr)->dl_signature, OCFS2_DX_LEAF_SIGNATURE))
|
|
|
|
static inline unsigned long ino_from_blkno(struct super_block *sb,
|
|
u64 blkno)
|
|
{
|
|
return (unsigned long)(blkno & (u64)ULONG_MAX);
|
|
}
|
|
|
|
static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,
|
|
u32 clusters)
|
|
{
|
|
int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -
|
|
sb->s_blocksize_bits;
|
|
|
|
return (u64)clusters << c_to_b_bits;
|
|
}
|
|
|
|
static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,
|
|
u64 blocks)
|
|
{
|
|
int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
|
|
sb->s_blocksize_bits;
|
|
|
|
return (u32)(blocks >> b_to_c_bits);
|
|
}
|
|
|
|
static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,
|
|
u64 bytes)
|
|
{
|
|
int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
|
|
unsigned int clusters;
|
|
|
|
bytes += OCFS2_SB(sb)->s_clustersize - 1;
|
|
/* OCFS2 just cannot have enough clusters to overflow this */
|
|
clusters = (unsigned int)(bytes >> cl_bits);
|
|
|
|
return clusters;
|
|
}
|
|
|
|
static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,
|
|
u64 bytes)
|
|
{
|
|
bytes += sb->s_blocksize - 1;
|
|
return bytes >> sb->s_blocksize_bits;
|
|
}
|
|
|
|
static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,
|
|
u32 clusters)
|
|
{
|
|
return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;
|
|
}
|
|
|
|
static inline u64 ocfs2_block_to_cluster_start(struct super_block *sb,
|
|
u64 blocks)
|
|
{
|
|
int bits = OCFS2_SB(sb)->s_clustersize_bits - sb->s_blocksize_bits;
|
|
unsigned int clusters;
|
|
|
|
clusters = ocfs2_blocks_to_clusters(sb, blocks);
|
|
return (u64)clusters << bits;
|
|
}
|
|
|
|
static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,
|
|
u64 bytes)
|
|
{
|
|
int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
|
|
unsigned int clusters;
|
|
|
|
clusters = ocfs2_clusters_for_bytes(sb, bytes);
|
|
return (u64)clusters << cl_bits;
|
|
}
|
|
|
|
static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,
|
|
u64 bytes)
|
|
{
|
|
u64 blocks;
|
|
|
|
blocks = ocfs2_blocks_for_bytes(sb, bytes);
|
|
return blocks << sb->s_blocksize_bits;
|
|
}
|
|
|
|
static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)
|
|
{
|
|
return (unsigned long)((bytes + 511) >> 9);
|
|
}
|
|
|
|
static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,
|
|
unsigned long pg_index)
|
|
{
|
|
u32 clusters = pg_index;
|
|
unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
|
|
|
|
if (unlikely(PAGE_CACHE_SHIFT > cbits))
|
|
clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);
|
|
else if (PAGE_CACHE_SHIFT < cbits)
|
|
clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);
|
|
|
|
return clusters;
|
|
}
|
|
|
|
/*
|
|
* Find the 1st page index which covers the given clusters.
|
|
*/
|
|
static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,
|
|
u32 clusters)
|
|
{
|
|
unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
|
|
pgoff_t index = clusters;
|
|
|
|
if (PAGE_CACHE_SHIFT > cbits) {
|
|
index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);
|
|
} else if (PAGE_CACHE_SHIFT < cbits) {
|
|
index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);
|
|
}
|
|
|
|
return index;
|
|
}
|
|
|
|
static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)
|
|
{
|
|
unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;
|
|
unsigned int pages_per_cluster = 1;
|
|
|
|
if (PAGE_CACHE_SHIFT < cbits)
|
|
pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);
|
|
|
|
return pages_per_cluster;
|
|
}
|
|
|
|
static inline unsigned int ocfs2_megabytes_to_clusters(struct super_block *sb,
|
|
unsigned int megs)
|
|
{
|
|
BUILD_BUG_ON(OCFS2_MAX_CLUSTERSIZE > 1048576);
|
|
|
|
return megs << (20 - OCFS2_SB(sb)->s_clustersize_bits);
|
|
}
|
|
|
|
static inline void ocfs2_init_inode_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
spin_lock(&osb->osb_lock);
|
|
osb->s_inode_steal_slot = OCFS2_INVALID_SLOT;
|
|
spin_unlock(&osb->osb_lock);
|
|
atomic_set(&osb->s_num_inodes_stolen, 0);
|
|
}
|
|
|
|
static inline void ocfs2_set_inode_steal_slot(struct ocfs2_super *osb,
|
|
s16 slot)
|
|
{
|
|
spin_lock(&osb->osb_lock);
|
|
osb->s_inode_steal_slot = slot;
|
|
spin_unlock(&osb->osb_lock);
|
|
}
|
|
|
|
static inline s16 ocfs2_get_inode_steal_slot(struct ocfs2_super *osb)
|
|
{
|
|
s16 slot;
|
|
|
|
spin_lock(&osb->osb_lock);
|
|
slot = osb->s_inode_steal_slot;
|
|
spin_unlock(&osb->osb_lock);
|
|
|
|
return slot;
|
|
}
|
|
|
|
#define ocfs2_set_bit ext2_set_bit
|
|
#define ocfs2_clear_bit ext2_clear_bit
|
|
#define ocfs2_test_bit ext2_test_bit
|
|
#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit
|
|
#define ocfs2_find_next_bit ext2_find_next_bit
|
|
#endif /* OCFS2_H */
|
|
|