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 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * ocfs2.h
  *
  * Defines macros and structures used in OCFS2
  *
  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  */
 
 #ifndef OCFS2_H
 #define OCFS2_H
 
 #include <linux/spinlock.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
 #include <linux/list.h>
 #include <linux/llist.h>
 #include <linux/rbtree.h>
 #include <linux/workqueue.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
 #include <linux/lockdep.h>
 #include <linux/jbd2.h>
 
 /* For union ocfs2_dlm_lksb */
 #include "stackglue.h"
 
 #include "ocfs2_fs.h"
 #include "ocfs2_lockid.h"
 #include "ocfs2_ioctl.h"
 
 /* For struct ocfs2_blockcheck_stats */
 #include "blockcheck.h"
 
 #include "reservations.h"
 
 #include "filecheck.h"
 
 /* Caching of metadata buffers */
 
 /* 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_CACHE_INFO_MAX_ARRAY 2
 
 /* Flags for ocfs2_caching_info */
 
 enum ocfs2_caching_info_flags {
     /* Indicates that the metadata cache is using the inline array */
     OCFS2_CACHE_FL_INLINE   = 1<<1,
 };
 
 struct ocfs2_caching_operations;
 struct ocfs2_caching_info {
     /*
      * The parent structure provides the locks, but because the
      * parent structure can differ, it provides locking operations
      * to struct ocfs2_caching_info.
      */
     const struct ocfs2_caching_operations *ci_ops;
 
     /* next two are protected by trans_inc_lock */
     /* which transaction were we created on? Zero if none. */
     unsigned long       ci_created_trans;
     /* last transaction we were a part of. */
     unsigned long       ci_last_trans;
 
     /* Cache structures */
     unsigned int        ci_flags;
     unsigned int        ci_num_cached;
     union {
     sector_t    ci_array[OCFS2_CACHE_INFO_MAX_ARRAY];
         struct rb_root  ci_tree;
     } ci_cache;
 };
 /*
  * Need this prototype here instead of in uptodate.h because journal.h
  * uses it.
  */
 struct super_block *ocfs2_metadata_cache_get_super(struct ocfs2_caching_info *ci);
 
 /* 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) /* we have 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 */
 #define OCFS2_LOCK_NOCACHE       (0x00000200) /* don't use a holder count */
 #define OCFS2_LOCK_PENDING       (0x00000400) /* This lockres is pending a
                          call to dlm_lock.  Only
                          exists with BUSY set. */
 #define OCFS2_LOCK_UPCONVERT_FINISHING (0x00000800) /* blocks the dc thread
                              * from downconverting
                              * before the upconvert
                              * has completed */
 
 #define OCFS2_LOCK_NONBLOCK_FINISHED (0x00001000) /* NONBLOCK cluster
                            * lock has already
                            * returned, do not block
                            * dc thread from
                            * downconverting */
 
 struct ocfs2_lock_res_ops;
 
 typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
 
 #ifdef CONFIG_OCFS2_FS_STATS
 struct ocfs2_lock_stats {
     u64     ls_total;   /* Total wait in NSEC */
     u32     ls_gets;    /* Num acquires */
     u32     ls_fail;    /* Num failed acquires */
 
     /* Storing max wait in usecs saves 24 bytes per inode */
     u32     ls_max;     /* Max wait in USEC */
     u64     ls_last;    /* Last unlock time in USEC */
 };
 #endif
 
 struct ocfs2_lock_res {
     void                    *l_priv;
     struct ocfs2_lock_res_ops *l_ops;
 
 
     struct list_head         l_blocked_list;
     struct list_head         l_mask_waiters;
     struct list_head     l_holders;
 
     unsigned long        l_flags;
     char                     l_name[OCFS2_LOCK_ID_MAX_LEN];
     unsigned int             l_ro_holders;
     unsigned int             l_ex_holders;
     signed char      l_level;
     signed char      l_requested;
     signed char      l_blocking;
 
     /* Data packed - type enum ocfs2_lock_type */
     unsigned char            l_type;
 
     /* used from AST/BAST funcs. */
     /* Data packed - enum type ocfs2_ast_action */
     unsigned char            l_action;
     /* Data packed - enum type ocfs2_unlock_action */
     unsigned char            l_unlock_action;
     unsigned int             l_pending_gen;
 
     spinlock_t               l_lock;
 
     struct ocfs2_dlm_lksb    l_lksb;
 
     wait_queue_head_t        l_event;
 
     struct list_head         l_debug_list;
 
 #ifdef CONFIG_OCFS2_FS_STATS
     struct ocfs2_lock_stats  l_lock_prmode;     /* PR mode stats */
     u32                      l_lock_refresh;    /* Disk refreshes */
     u64                      l_lock_wait;   /* First lock wait time */
     struct ocfs2_lock_stats  l_lock_exmode;     /* EX mode stats */
 #endif
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
     struct lockdep_map   l_lockdep_map;
 #endif
 };
 
 enum ocfs2_orphan_reco_type {
     ORPHAN_NO_NEED_TRUNCATE = 0,
     ORPHAN_NEED_TRUNCATE,
 };
 
 enum ocfs2_orphan_scan_state {
     ORPHAN_SCAN_ACTIVE,
     ORPHAN_SCAN_INACTIVE
 };
 
 struct ocfs2_orphan_scan {
     struct mutex        os_lock;
     struct ocfs2_super  *os_osb;
     struct ocfs2_lock_res   os_lockres;     /* lock to synchronize scans */
     struct delayed_work     os_orphan_scan_work;
     time64_t        os_scantime;  /* time this node ran the scan */
     u32         os_count;      /* tracks node specific scans */
     u32             os_seqno;       /* tracks cluster wide scans */
     atomic_t        os_state;              /* ACTIVE or INACTIVE */
 };
 
 struct ocfs2_dlm_debug {
     struct kref d_refcnt;
     u32 d_filter_secs;
     struct list_head d_lockres_tracking;
 };
 
 enum ocfs2_vol_state
 {
     VOLUME_INIT = 0,
     VOLUME_MOUNTED,
     VOLUME_MOUNTED_QUOTAS,
     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,    /* Local alloc will never be used for
                  * this mountpoint. */
     OCFS2_LA_ENABLED,   /* Local alloc is in use. */
     OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
                  * of bits has been reduced. */
     OCFS2_LA_DISABLED   /* Local alloc has temporarily been
                  * disabled. */
 };
 
 enum ocfs2_mount_options
 {
     OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Local heartbeat */
     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 */
     OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
     OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
     OCFS2_MOUNT_INODE64 = 1 << 7,   /* Allow inode numbers > 2^32 */
     OCFS2_MOUNT_POSIX_ACL = 1 << 8, /* Force POSIX access control lists */
     OCFS2_MOUNT_NO_POSIX_ACL = 1 << 9,  /* Disable POSIX access
                            control lists */
     OCFS2_MOUNT_USRQUOTA = 1 << 10, /* We support user quotas */
     OCFS2_MOUNT_GRPQUOTA = 1 << 11, /* We support group quotas */
     OCFS2_MOUNT_COHERENCY_BUFFERED = 1 << 12, /* Allow concurrent O_DIRECT
                              writes */
     OCFS2_MOUNT_HB_NONE = 1 << 13, /* No heartbeat */
     OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
 
     OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15,  /* Journal Async Commit */
     OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
     OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
 };
 
 #define OCFS2_OSB_SOFT_RO   0x0001
 #define OCFS2_OSB_HARD_RO   0x0002
 #define OCFS2_OSB_ERROR_FS  0x0004
 #define OCFS2_DEFAULT_ATIME_QUANTUM 60
 
 struct ocfs2_journal;
 struct ocfs2_slot_info;
 struct ocfs2_recovery_map;
 struct ocfs2_replay_map;
 struct ocfs2_quota_recovery;
 struct ocfs2_super
 {
     struct task_struct *commit_task;
     struct super_block *sb;
     struct inode *root_inode;
     struct inode *sys_root_inode;
     struct inode *global_system_inodes[NUM_GLOBAL_SYSTEM_INODES];
     struct inode **local_system_inodes;
 
     struct ocfs2_slot_info *slot_info;
 
     u32 *slot_recovery_generations;
 
     spinlock_t node_map_lock;
 
     u64 root_blkno;
     u64 system_dir_blkno;
     u64 bitmap_blkno;
     u32 bitmap_cpg;
     char *uuid_str;
     u32 uuid_hash;
     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_generation, osb_flags and s_inode_steal_slot.
      * Could protect more on osb as it's very short lived.
      */
     spinlock_t osb_lock;
     u32 s_next_generation;
     unsigned long osb_flags;
     u16 s_inode_steal_slot;
     u16 s_meta_steal_slot;
     atomic_t s_num_inodes_stolen;
     atomic_t s_num_meta_stolen;
 
     unsigned long s_mount_opt;
     unsigned int s_atime_quantum;
 
     unsigned int max_slots;
     unsigned int node_num;
     int slot_num;
     int preferred_slot;
     int s_sectsize_bits;
     int s_clustersize;
     int s_clustersize_bits;
     unsigned int s_xattr_inline_size;
 
     atomic_t vol_state;
     struct mutex recovery_lock;
     struct ocfs2_recovery_map *recovery_map;
     struct ocfs2_replay_map *replay_map;
     struct task_struct *recovery_thread_task;
     int disable_recovery;
     wait_queue_head_t checkpoint_event;
     struct ocfs2_journal *journal;
     unsigned long osb_commit_interval;
 
     struct delayed_work     la_enable_wq;
 
     /*
      * Must hold local alloc i_rwsem and osb->osb_lock to change
      * local_alloc_bits. Reads can be done under either lock.
      */
     unsigned int local_alloc_bits;
     unsigned int local_alloc_default_bits;
     /* osb_clusters_at_boot can become stale! Do not trust it to
      * be up to date. */
     unsigned int osb_clusters_at_boot;
 
     enum ocfs2_local_alloc_state local_alloc_state; /* protected
                              * by osb_lock */
 
     struct buffer_head *local_alloc_bh;
 
     u64 la_last_gd;
 
     struct ocfs2_reservation_map    osb_la_resmap;
 
     unsigned int    osb_resv_level;
     unsigned int    osb_dir_resv_level;
 
     /* Next two fields are for local node slot recovery during
      * mount. */
     struct ocfs2_dinode *local_alloc_copy;
     struct ocfs2_quota_recovery *quota_rec;
 
     struct ocfs2_blockcheck_stats osb_ecc_stats;
     struct ocfs2_alloc_stats alloc_stats;
     char dev_str[20];       /* "major,minor" of the device */
 
     u8 osb_stackflags;
 
     char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
     char osb_cluster_name[OCFS2_CLUSTER_NAME_LEN + 1];
     struct ocfs2_cluster_connection *cconn;
     struct ocfs2_lock_res osb_super_lockres;
     struct ocfs2_lock_res osb_rename_lockres;
     struct ocfs2_lock_res osb_nfs_sync_lockres;
     struct rw_semaphore nfs_sync_rwlock;
     struct ocfs2_lock_res osb_trim_fs_lockres;
     struct mutex obs_trim_fs_mutex;
     struct ocfs2_dlm_debug *osb_dlm_debug;
 
     struct dentry *osb_debug_root;
 
     wait_queue_head_t recovery_event;
 
     spinlock_t dc_task_lock;
     struct task_struct *dc_task;
     wait_queue_head_t dc_event;
     unsigned long dc_wake_sequence;
     unsigned long dc_work_sequence;
 
     /*
      * Any thread can add locks to the list, but the downconvert
      * thread is the only one allowed to remove locks. Any change
      * to this rule requires updating
      * ocfs2_downconvert_thread_do_work().
      */
     struct list_head blocked_lock_list;
     unsigned long blocked_lock_count;
 
     /* List of dquot structures to drop last reference to */
     struct llist_head dquot_drop_list;
     struct work_struct dquot_drop_work;
 
     wait_queue_head_t       osb_mount_event;
 
     /* Truncate log info */
     struct inode            *osb_tl_inode;
     struct buffer_head      *osb_tl_bh;
     struct delayed_work     osb_truncate_log_wq;
     atomic_t            osb_tl_disable;
     /*
      * How many clusters in our truncate log.
      * It must be protected by osb_tl_inode->i_rwsem.
      */
     unsigned int truncated_clusters;
 
     struct ocfs2_node_map       osb_recovering_orphan_dirs;
     unsigned int            *osb_orphan_wipes;
     wait_queue_head_t       osb_wipe_event;
 
     struct ocfs2_orphan_scan    osb_orphan_scan;
 
     /* used to protect metaecc calculation check of xattr. */
     spinlock_t osb_xattr_lock;
 
     unsigned int            osb_dx_mask;
     u32             osb_dx_seed[4];
 
     /* the group we used to allocate inodes. */
     u64             osb_inode_alloc_group;
 
     /* rb tree root for refcount lock. */
     struct rb_root  osb_rf_lock_tree;
     struct ocfs2_refcount_tree *osb_ref_tree_lru;
 
     struct mutex system_file_mutex;
 
     /*
      * OCFS2 needs to schedule several different types of work which
      * require cluster locking, disk I/O, recovery waits, etc. Since these
      * types of work tend to be heavy we avoid using the kernel events
      * workqueue and schedule on our own.
      */
     struct workqueue_struct *ocfs2_wq;
 
     /* sysfs directory per partition */
     struct kset *osb_dev_kset;
 
     /* file check related stuff */
     struct ocfs2_filecheck_sysfs_entry osb_fc_ent;
 };
 
 #define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)
 
 /* Useful typedef for passing around journal access functions */
 typedef int (*ocfs2_journal_access_func)(handle_t *handle,
                      struct ocfs2_caching_info *ci,
                      struct buffer_head *bh, int type);
 
 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;
 }
 
 static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)
 {
     /*
      * Support for sparse files is a pre-requisite
      */
     if (!ocfs2_sparse_alloc(osb))
         return 0;
 
     if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
         return 1;
     return 0;
 }
 
 
 static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_meta_ecc(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_META_ECC)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_supports_indexed_dirs(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS)
         return 1;
     return 0;
 }
 
 static inline int ocfs2_supports_discontig_bg(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG)
         return 1;
     return 0;
 }
 
 static inline unsigned int ocfs2_link_max(struct ocfs2_super *osb)
 {
     if (ocfs2_supports_indexed_dirs(osb))
         return OCFS2_DX_LINK_MAX;
     return OCFS2_LINK_MAX;
 }
 
 static inline unsigned int ocfs2_read_links_count(struct ocfs2_dinode *di)
 {
     u32 nlink = le16_to_cpu(di->i_links_count);
     u32 hi = le16_to_cpu(di->i_links_count_hi);
 
     if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
         nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
 
     return nlink;
 }
 
 static inline void ocfs2_set_links_count(struct ocfs2_dinode *di, u32 nlink)
 {
     u16 lo, hi;
 
     lo = nlink;
     hi = nlink >> OCFS2_LINKS_HI_SHIFT;
 
     di->i_links_count = cpu_to_le16(lo);
     di->i_links_count_hi = cpu_to_le16(hi);
 }
 
 static inline void ocfs2_add_links_count(struct ocfs2_dinode *di, int n)
 {
     u32 links = ocfs2_read_links_count(di);
 
     links += n;
 
     ocfs2_set_links_count(di, links);
 }
 
 static inline int ocfs2_refcount_tree(struct ocfs2_super *osb)
 {
     if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE)
         return 1;
     return 0;
 }
 
 /* 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;
 }
 
 static inline int ocfs2_clusterinfo_valid(struct ocfs2_super *osb)
 {
     return (osb->s_feature_incompat &
         (OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK |
          OCFS2_FEATURE_INCOMPAT_CLUSTERINFO));
 }
 
 static inline int ocfs2_userspace_stack(struct ocfs2_super *osb)
 {
     if (ocfs2_clusterinfo_valid(osb) &&
         memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
            OCFS2_STACK_LABEL_LEN))
         return 1;
     return 0;
 }
 
 static inline int ocfs2_o2cb_stack(struct ocfs2_super *osb)
 {
     if (ocfs2_clusterinfo_valid(osb) &&
         !memcmp(osb->osb_cluster_stack, OCFS2_CLASSIC_CLUSTER_STACK,
            OCFS2_STACK_LABEL_LEN))
         return 1;
     return 0;
 }
 
 static inline int ocfs2_cluster_o2cb_global_heartbeat(struct ocfs2_super *osb)
 {
     return ocfs2_o2cb_stack(osb) &&
         (osb->osb_stackflags & OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT);
 }
 
 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))
 
 #define OCFS2_IS_VALID_REFCOUNT_BLOCK(ptr)              \
     (!strcmp((ptr)->rf_signature, OCFS2_REFCOUNT_BLOCK_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_clusters_for_blocks(struct super_block *sb,
         u64 blocks)
 {
     int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -
             sb->s_blocksize_bits;
 
     blocks += (1 << b_to_c_bits) - 1;
     return (u32)(blocks >> b_to_c_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 unsigned int ocfs2_bytes_to_clusters(struct super_block *sb,
         u64 bytes)
 {
     int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;
     unsigned int clusters;
 
     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_SHIFT > cbits))
         clusters = pg_index << (PAGE_SHIFT - cbits);
     else if (PAGE_SHIFT < cbits)
         clusters = pg_index >> (cbits - PAGE_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_SHIFT > cbits) {
         index = (pgoff_t)clusters >> (PAGE_SHIFT - cbits);
     } else if (PAGE_SHIFT < cbits) {
         index = (pgoff_t)clusters << (cbits - PAGE_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_SHIFT < cbits)
         pages_per_cluster = 1 << (cbits - PAGE_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 unsigned int ocfs2_clusters_to_megabytes(struct super_block *sb,
                                unsigned int clusters)
 {
     return clusters >> (20 - OCFS2_SB(sb)->s_clustersize_bits);
 }
 
 static inline void _ocfs2_set_bit(unsigned int bit, unsigned long *bitmap)
 {
     __set_bit_le(bit, bitmap);
 }
 #define ocfs2_set_bit(bit, addr) _ocfs2_set_bit((bit), (unsigned long *)(addr))
 
 static inline void _ocfs2_clear_bit(unsigned int bit, unsigned long *bitmap)
 {
     __clear_bit_le(bit, bitmap);
 }
 #define ocfs2_clear_bit(bit, addr) _ocfs2_clear_bit((bit), (unsigned long *)(addr))
 
 #define ocfs2_test_bit test_bit_le
 #define ocfs2_find_next_zero_bit find_next_zero_bit_le
 #define ocfs2_find_next_bit find_next_bit_le
 
 static inline void *correct_addr_and_bit_unaligned(int *bit, void *addr)
 {
 #if BITS_PER_LONG == 64
     *bit += ((unsigned long) addr & 7UL) << 3;
     addr = (void *) ((unsigned long) addr & ~7UL);
 #elif BITS_PER_LONG == 32
     *bit += ((unsigned long) addr & 3UL) << 3;
     addr = (void *) ((unsigned long) addr & ~3UL);
 #else
 #error "how many bits you are?!"
 #endif
     return addr;
 }
 
 static inline void ocfs2_set_bit_unaligned(int bit, void *bitmap)
 {
     bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
     ocfs2_set_bit(bit, bitmap);
 }
 
 static inline void ocfs2_clear_bit_unaligned(int bit, void *bitmap)
 {
     bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
     ocfs2_clear_bit(bit, bitmap);
 }
 
 static inline int ocfs2_test_bit_unaligned(int bit, void *bitmap)
 {
     bitmap = correct_addr_and_bit_unaligned(&bit, bitmap);
     return ocfs2_test_bit(bit, bitmap);
 }
 
 static inline int ocfs2_find_next_zero_bit_unaligned(void *bitmap, int max,
                             int start)
 {
     int fix = 0, ret, tmpmax;
     bitmap = correct_addr_and_bit_unaligned(&fix, bitmap);
     tmpmax = max + fix;
     start += fix;
 
     ret = ocfs2_find_next_zero_bit(bitmap, tmpmax, start) - fix;
     if (ret > max)
         return max;
     return ret;
 }
 
 #endif  /* OCFS2_H */
 

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