[PATCH] OCFS2: The Second Oracle Cluster Filesystem
The OCFS2 file system module.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
new file mode 100644
index 0000000..f468c60
--- /dev/null
+++ b/fs/ocfs2/ocfs2.h
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+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2.h
+ *
+ * Defines macros and structures used in OCFS2
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef OCFS2_H
+#define OCFS2_H
+
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/rbtree.h>
+#include <linux/workqueue.h>
+#include <linux/kref.h>
+
+#include "cluster/nodemanager.h"
+#include "cluster/heartbeat.h"
+#include "cluster/tcp.h"
+
+#include "dlm/dlmapi.h"
+
+#include "ocfs2_fs.h"
+#include "endian.h"
+#include "ocfs2_lockid.h"
+
+struct ocfs2_extent_map {
+ u32 em_clusters;
+ struct rb_root em_extents;
+};
+
+/* Most user visible OCFS2 inodes will have very few pieces of
+ * metadata, but larger files (including bitmaps, etc) must be taken
+ * into account when designing an access scheme. We allow a small
+ * amount of inlined blocks to be stored on an array and grow the
+ * structure into a rb tree when necessary. */
+#define OCFS2_INODE_MAX_CACHE_ARRAY 2
+
+struct ocfs2_caching_info {
+ unsigned int ci_num_cached;
+ union {
+ sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
+ struct rb_root ci_tree;
+ } ci_cache;
+};
+
+/* this limits us to 256 nodes
+ * if we need more, we can do a kmalloc for the map */
+#define OCFS2_NODE_MAP_MAX_NODES 256
+struct ocfs2_node_map {
+ u16 num_nodes;
+ unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
+};
+
+enum ocfs2_ast_action {
+ OCFS2_AST_INVALID = 0,
+ OCFS2_AST_ATTACH,
+ OCFS2_AST_CONVERT,
+ OCFS2_AST_DOWNCONVERT,
+};
+
+/* actions for an unlockast function to take. */
+enum ocfs2_unlock_action {
+ OCFS2_UNLOCK_INVALID = 0,
+ OCFS2_UNLOCK_CANCEL_CONVERT,
+ OCFS2_UNLOCK_DROP_LOCK,
+};
+
+/* ocfs2_lock_res->l_flags flags. */
+#define OCFS2_LOCK_ATTACHED (0x00000001) /* have we initialized
+ * the lvb */
+#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
+ * dlm_lock */
+#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
+ * downconvert*/
+#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
+#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
+#define OCFS2_LOCK_REFRESHING (0x00000020)
+#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
+ * for shutdown paths */
+#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
+ * when to skip queueing
+ * a lock because it's
+ * about to be
+ * dropped. */
+#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
+
+struct ocfs2_lock_res_ops;
+
+typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
+
+struct ocfs2_lock_res {
+ void *l_priv;
+ struct ocfs2_lock_res_ops *l_ops;
+ spinlock_t l_lock;
+
+ struct list_head l_blocked_list;
+ struct list_head l_mask_waiters;
+
+ enum ocfs2_lock_type l_type;
+ unsigned long l_flags;
+ char l_name[OCFS2_LOCK_ID_MAX_LEN];
+ int l_level;
+ unsigned int l_ro_holders;
+ unsigned int l_ex_holders;
+ struct dlm_lockstatus l_lksb;
+
+ /* used from AST/BAST funcs. */
+ enum ocfs2_ast_action l_action;
+ enum ocfs2_unlock_action l_unlock_action;
+ int l_requested;
+ int l_blocking;
+
+ wait_queue_head_t l_event;
+
+ struct list_head l_debug_list;
+};
+
+struct ocfs2_dlm_debug {
+ struct kref d_refcnt;
+ struct dentry *d_locking_state;
+ struct list_head d_lockres_tracking;
+};
+
+enum ocfs2_vol_state
+{
+ VOLUME_INIT = 0,
+ VOLUME_MOUNTED,
+ VOLUME_DISMOUNTED,
+ VOLUME_DISABLED
+};
+
+struct ocfs2_alloc_stats
+{
+ atomic_t moves;
+ atomic_t local_data;
+ atomic_t bitmap_data;
+ atomic_t bg_allocs;
+ atomic_t bg_extends;
+};
+
+enum ocfs2_local_alloc_state
+{
+ OCFS2_LA_UNUSED = 0,
+ OCFS2_LA_ENABLED,
+ OCFS2_LA_DISABLED
+};
+
+enum ocfs2_mount_options
+{
+ OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
+ OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
+ OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
+ OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
+ OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
+#ifdef OCFS2_ORACORE_WORKAROUNDS
+ OCFS2_MOUNT_COMPAT_OCFS = 1 << 30, /* ocfs1 compatibility mode */
+#endif
+};
+
+#define OCFS2_OSB_SOFT_RO 0x0001
+#define OCFS2_OSB_HARD_RO 0x0002
+#define OCFS2_OSB_ERROR_FS 0x0004
+
+struct ocfs2_journal;
+struct ocfs2_journal_handle;
+struct ocfs2_super
+{
+ u32 osb_id; /* id used by the proc interface */
+ struct task_struct *commit_task;
+ struct super_block *sb;
+ struct inode *root_inode;
+ struct inode *sys_root_inode;
+ struct inode *system_inodes[NUM_SYSTEM_INODES];
+
+ struct ocfs2_slot_info *slot_info;
+
+ spinlock_t node_map_lock;
+ struct ocfs2_node_map mounted_map;
+ struct ocfs2_node_map recovery_map;
+ struct ocfs2_node_map umount_map;
+
+ u32 num_clusters;
+ u64 root_blkno;
+ u64 system_dir_blkno;
+ u64 bitmap_blkno;
+ u32 bitmap_cpg;
+ u8 *uuid;
+ char *uuid_str;
+ u8 *vol_label;
+ u64 first_cluster_group_blkno;
+ u32 fs_generation;
+
+ u32 s_feature_compat;
+ u32 s_feature_incompat;
+ u32 s_feature_ro_compat;
+
+ /* Protects s_next_generaion, osb_flags. Could protect more on
+ * osb as it's very short lived. */
+ spinlock_t osb_lock;
+ u32 s_next_generation;
+ unsigned long osb_flags;
+
+ unsigned long s_mount_opt;
+
+ u16 max_slots;
+ u16 num_nodes;
+ s16 node_num;
+ s16 slot_num;
+ int s_sectsize_bits;
+ int s_clustersize;
+ int s_clustersize_bits;
+ struct proc_dir_entry *proc_sub_dir; /* points to /proc/fs/ocfs2/<maj_min> */
+
+ atomic_t vol_state;
+ struct semaphore recovery_lock;
+ struct task_struct *recovery_thread_task;
+ int disable_recovery;
+ wait_queue_head_t checkpoint_event;
+ atomic_t needs_checkpoint;
+ struct ocfs2_journal *journal;
+
+ enum ocfs2_local_alloc_state local_alloc_state;
+ struct buffer_head *local_alloc_bh;
+
+ /* Next two fields are for local node slot recovery during
+ * mount. */
+ int dirty;
+ struct ocfs2_dinode *local_alloc_copy;
+
+ struct ocfs2_alloc_stats alloc_stats;
+ char dev_str[20]; /* "major,minor" of the device */
+
+ struct dlm_ctxt *dlm;
+ struct ocfs2_lock_res osb_super_lockres;
+ struct ocfs2_lock_res osb_rename_lockres;
+ struct dlm_eviction_cb osb_eviction_cb;
+ struct ocfs2_dlm_debug *osb_dlm_debug;
+
+ struct dentry *osb_debug_root;
+
+ wait_queue_head_t recovery_event;
+
+ spinlock_t vote_task_lock;
+ struct task_struct *vote_task;
+ wait_queue_head_t vote_event;
+ unsigned long vote_wake_sequence;
+ unsigned long vote_work_sequence;
+
+ struct list_head blocked_lock_list;
+ unsigned long blocked_lock_count;
+
+ struct list_head vote_list;
+ int vote_count;
+
+ u32 net_key;
+ spinlock_t net_response_lock;
+ unsigned int net_response_ids;
+ struct list_head net_response_list;
+
+ struct o2hb_callback_func osb_hb_up;
+ struct o2hb_callback_func osb_hb_down;
+
+ struct list_head osb_net_handlers;
+
+ wait_queue_head_t osb_mount_event;
+
+ /* Truncate log info */
+ struct inode *osb_tl_inode;
+ struct buffer_head *osb_tl_bh;
+ struct work_struct osb_truncate_log_wq;
+};
+
+#define OCFS2_SB(sb) ((struct ocfs2_super *)(sb)->s_fs_info)
+#define OCFS2_MAX_OSB_ID 65536
+
+static inline int ocfs2_should_order_data(struct inode *inode)
+{
+ if (!S_ISREG(inode->i_mode))
+ return 0;
+ if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)
+ return 0;
+ return 1;
+}
+
+/* set / clear functions because cluster events can make these happen
+ * in parallel so we want the transitions to be atomic. this also
+ * means that any future flags osb_flags must be protected by spinlock
+ * too! */
+static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,
+ unsigned long flag)
+{
+ spin_lock(&osb->osb_lock);
+ osb->osb_flags |= flag;
+ spin_unlock(&osb->osb_lock);
+}
+
+static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,
+ int hard)
+{
+ spin_lock(&osb->osb_lock);
+ osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);
+ if (hard)
+ osb->osb_flags |= OCFS2_OSB_HARD_RO;
+ else
+ osb->osb_flags |= OCFS2_OSB_SOFT_RO;
+ spin_unlock(&osb->osb_lock);
+}
+
+static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)
+{
+ int ret;
+
+ spin_lock(&osb->osb_lock);
+ ret = osb->osb_flags & OCFS2_OSB_HARD_RO;
+ spin_unlock(&osb->osb_lock);
+
+ return ret;
+}
+
+static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)
+{
+ int ret;
+
+ spin_lock(&osb->osb_lock);
+ ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;
+ spin_unlock(&osb->osb_lock);
+
+ return ret;
+}
+
+#define OCFS2_IS_VALID_DINODE(ptr) \
+ (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))
+
+#define OCFS2_RO_ON_INVALID_DINODE(__sb, __di) do { \
+ typeof(__di) ____di = (__di); \
+ ocfs2_error((__sb), \
+ "Dinode # %"MLFu64" has bad signature %.*s", \
+ (____di)->i_blkno, 7, \
+ (____di)->i_signature); \
+} while (0);
+
+#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr) \
+ (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))
+
+#define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb) do { \
+ typeof(__eb) ____eb = (__eb); \
+ ocfs2_error((__sb), \
+ "Extent Block # %"MLFu64" has bad signature %.*s", \
+ (____eb)->h_blkno, 7, \
+ (____eb)->h_signature); \
+} while (0);
+
+#define OCFS2_IS_VALID_GROUP_DESC(ptr) \
+ (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))
+
+#define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd) do { \
+ typeof(__gd) ____gd = (__gd); \
+ ocfs2_error((__sb), \
+ "Group Descriptor # %"MLFu64" has bad signature %.*s", \
+ (____gd)->bg_blkno, 7, \
+ (____gd)->bg_signature); \
+} while (0);
+
+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_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);
+}
+
+#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
+#endif /* OCFS2_H */
+