struct ocfs2_journal { enum ocfs2_journal_state j_state; /* Journals current state */
journal_t *j_journal; /* The kernels journal type */ struct inode *j_inode; /* Kernel inode pointing to
* this journal */ struct ocfs2_super *j_osb; /* pointer to the super * block for the node * we're currently * running on -- not * necessarily the super * block from the node * which we usually run * from (recovery,
* etc) */ struct buffer_head *j_bh; /* Journal disk inode block */
atomic_t j_num_trans; /* Number of transactions
* currently in the system. */
spinlock_t j_lock; unsignedlong j_trans_id; struct rw_semaphore j_trans_barrier;
wait_queue_head_t j_checkpointed;
/* both fields protected by j_lock*/ struct list_head j_la_cleanups; struct work_struct j_recovery_work;
};
extern spinlock_t trans_inc_lock;
/* wrap j_trans_id so we never have it equal to zero. */ staticinlineunsignedlong ocfs2_inc_trans_id(struct ocfs2_journal *j)
{ unsignedlong old_id;
spin_lock(&trans_inc_lock);
old_id = j->j_trans_id++; if (unlikely(!j->j_trans_id))
j->j_trans_id = 1;
spin_unlock(&trans_inc_lock); return old_id;
}
/* Used to figure out whether it's safe to drop a metadata lock on an * cached object. Returns true if all the object's changes have been * checkpointed to disk. You should be holding the spinlock on the * metadata lock while calling this to be sure that nobody can take
* the lock and put it on another transaction. */ staticinlineint ocfs2_ci_fully_checkpointed(struct ocfs2_caching_info *ci)
{ int ret; struct ocfs2_journal *journal =
OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
spin_lock(&trans_inc_lock);
ret = time_after(journal->j_trans_id, ci->ci_last_trans);
spin_unlock(&trans_inc_lock); return ret;
}
/* convenience function to check if an object backed by struct * ocfs2_caching_info is still new (has never hit disk) Will do you a * favor and set created_trans = 0 when you've
* been checkpointed. returns '1' if the ci is still new. */ staticinlineint ocfs2_ci_is_new(struct ocfs2_caching_info *ci)
{ int ret; struct ocfs2_journal *journal =
OCFS2_SB(ocfs2_metadata_cache_get_super(ci))->journal;
spin_lock(&trans_inc_lock);
ret = !(time_after(journal->j_trans_id, ci->ci_created_trans)); if (!ret)
ci->ci_created_trans = 0;
spin_unlock(&trans_inc_lock); return ret;
}
/* Wrapper for inodes so we can check system files */ staticinlineint ocfs2_inode_is_new(struct inode *inode)
{ /* System files are never "new" as they're written out by * mkfs. This helps us early during mount, before we have the
* journal open and j_trans_id could be junk. */ if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) return 0;
/* Exported only for the journal struct init code in super.c. Do not call. */ void ocfs2_orphan_scan_init(struct ocfs2_super *osb); void ocfs2_orphan_scan_start(struct ocfs2_super *osb); void ocfs2_orphan_scan_stop(struct ocfs2_super *osb);
int ocfs2_compute_replay_slots(struct ocfs2_super *osb); void ocfs2_free_replay_slots(struct ocfs2_super *osb); /* * Journal Control: * Initialize, Load, Shutdown, Wipe a journal. * * ocfs2_journal_alloc - Initialize skeleton for journal structure. * ocfs2_journal_init - Initialize journal structures in the OSB. * ocfs2_journal_load - Load the given journal off disk. Replay it if * there's transactions still in there. * ocfs2_journal_shutdown - Shutdown a journal, this will flush all * uncommitted, uncheckpointed transactions. * ocfs2_journal_wipe - Wipe transactions from a journal. Optionally * zero out each block. * ocfs2_recovery_thread - Perform recovery on a node. osb is our own osb. * ocfs2_mark_dead_nodes - Start recovery on nodes we won't get a heartbeat * event on. * ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint.
*/ void ocfs2_set_journal_params(struct ocfs2_super *osb); int ocfs2_journal_alloc(struct ocfs2_super *osb); int ocfs2_journal_init(struct ocfs2_super *osb, int *dirty); void ocfs2_journal_shutdown(struct ocfs2_super *osb); int ocfs2_journal_wipe(struct ocfs2_journal *journal, int full); int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed); int ocfs2_check_journals_nolocks(struct ocfs2_super *osb); void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num); int ocfs2_mark_dead_nodes(struct ocfs2_super *osb); void ocfs2_complete_mount_recovery(struct ocfs2_super *osb); void ocfs2_complete_quota_recovery(struct ocfs2_super *osb);
if (!ocfs2_ci_fully_checkpointed(INODE_CACHE(inode))) { /* WARNING: This only kicks off a single * checkpoint. If someone races you and adds more * metadata to the journal, you won't know, and will * wind up waiting *a lot* longer than necessary. Right * now we only use this in clear_inode so that's
* OK. */
ocfs2_start_checkpoint(osb);
/* * Transaction Handling: * Manage the lifetime of a transaction handle. * * ocfs2_start_trans - Begin a transaction. Give it an upper estimate of * the number of blocks that will be changed during * this handle. * ocfs2_commit_trans - Complete a handle. It might return -EIO if * the journal was aborted. The majority of paths don't * check the return value as an error there comes too * late to do anything (and will be picked up in a * later transaction). * ocfs2_extend_trans - Extend a handle by nblocks credits. This may * commit the handle to disk in the process, but will * not release any locks taken during the transaction. * ocfs2_journal_access* - Notify the handle that we want to journal this * buffer. Will have to call ocfs2_journal_dirty once * we've actually dirtied it. Type is one of . or . * Always call the specific flavor of * ocfs2_journal_access_*() unless you intend to * manage the checksum by hand. * ocfs2_journal_dirty - Mark a journalled buffer as having dirty data. * ocfs2_jbd2_inode_add_write - Mark an inode with range so that its data goes * out before the current handle commits.
*/
/* You must always start_trans with a number of buffs > 0, but it's * perfectly legal to go through an entire transaction without having
* dirtied any buffers. */
handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs); int ocfs2_commit_trans(struct ocfs2_super *osb,
handle_t *handle); int ocfs2_extend_trans(handle_t *handle, int nblocks); int ocfs2_assure_trans_credits(handle_t *handle, int nblocks); int ocfs2_allocate_extend_trans(handle_t *handle, int thresh);
/* * Define an arbitrary limit for the amount of data we will anticipate * writing to any given transaction. For unbounded transactions such as * fallocate(2) we can write more than this, but we always * start off at the maximum transaction size and grow the transaction * optimistically as we go.
*/ #define OCFS2_MAX_TRANS_DATA 64U
/* * Create access is for when we get a newly created buffer and we're * not gonna read it off disk, but rather fill it ourselves. Right * now, we don't do anything special with this (it turns into a write * request), but this is a good placeholder in case we do... * * Write access is for when we read a block off disk and are going to * modify it. This way the journalling layer knows it may need to make * a copy of that block (if it's part of another, uncommitted * transaction) before we do so.
*/ #define OCFS2_JOURNAL_ACCESS_CREATE 0 #define OCFS2_JOURNAL_ACCESS_WRITE 1 #define OCFS2_JOURNAL_ACCESS_UNDO 2
/* ocfs2_inode */ int ocfs2_journal_access_di(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_extent_block */ int ocfs2_journal_access_eb(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_refcount_block */ int ocfs2_journal_access_rb(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_group_desc */ int ocfs2_journal_access_gd(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_xattr_block */ int ocfs2_journal_access_xb(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* quota blocks */ int ocfs2_journal_access_dq(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* dirblock */ int ocfs2_journal_access_db(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_dx_root_block */ int ocfs2_journal_access_dr(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* ocfs2_dx_leaf */ int ocfs2_journal_access_dl(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type); /* Anything that has no ecc */ int ocfs2_journal_access(handle_t *handle, struct ocfs2_caching_info *ci, struct buffer_head *bh, int type);
/* * A word about the journal_access/journal_dirty "dance". It is * entirely legal to journal_access a buffer more than once (as long * as the access type is the same -- I'm not sure what will happen if * access type is different but this should never happen anyway) It is * also legal to journal_dirty a buffer more than once. In fact, you * can even journal_access a buffer after you've done a * journal_access/journal_dirty pair. The only thing you cannot do * however, is journal_dirty a buffer which you haven't yet passed to * journal_access at least once. * * That said, 99% of the time this doesn't matter and this is what the * path looks like: * * <read a bh> * ocfs2_journal_access(handle, bh, OCFS2_JOURNAL_ACCESS_WRITE); * <modify the bh> * ocfs2_journal_dirty(handle, bh);
*/ void ocfs2_journal_dirty(handle_t *handle, struct buffer_head *bh);
/* * Credit Macros: * Convenience macros to calculate number of credits needed. * * For convenience sake, I have a set of macros here which calculate * the *maximum* number of sectors which will be changed for various * metadata updates.
*/
/* simple file updates like chmod, etc. */ #define OCFS2_INODE_UPDATE_CREDITS 1
/* Update of a single quota block */ #define OCFS2_QUOTA_BLOCK_UPDATE_CREDITS 1
/* global quotafile inode update, data block */ #define OCFS2_QINFO_WRITE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + \
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
#define OCFS2_LOCAL_QINFO_WRITE_CREDITS OCFS2_QUOTA_BLOCK_UPDATE_CREDITS /* * The two writes below can accidentally see global info dirty due * to set_info() quotactl so make them prepared for the writes.
*/ /* quota data block, global info */ /* Write to local quota file */ #define OCFS2_QWRITE_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
/* global quota data block, local quota data block, global quota inode,
* global quota info */ #define OCFS2_QSYNC_CREDITS (OCFS2_QINFO_WRITE_CREDITS + \
2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS)
staticinlineint ocfs2_quota_trans_credits(struct super_block *sb)
{ int credits = 0;
if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA))
credits += OCFS2_QWRITE_CREDITS; if (OCFS2_HAS_RO_COMPAT_FEATURE(sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA))
credits += OCFS2_QWRITE_CREDITS; return credits;
}
/* group extend. inode update and last group update. */ #define OCFS2_GROUP_EXTEND_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* group add. inode update and the new group update. */ #define OCFS2_GROUP_ADD_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* get one bit out of a suballocator: dinode + group descriptor +
* prev. group desc. if we relink. */ #define OCFS2_SUBALLOC_ALLOC (3)
/* data block for new dir/symlink, allocation of directory block, dx_root
* update for free list */ #define OCFS2_DIR_LINK_ADDITIONAL_CREDITS (1 + OCFS2_SUBALLOC_ALLOC + 1)
/* local alloc metadata change + main bitmap updates */ #define OCFS2_WINDOW_MOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS \
+ OCFS2_SUBALLOC_ALLOC + OCFS2_SUBALLOC_FREE)
/* used when we don't need an allocation change for a dir extend. One
* for the dinode, one for the new block. */ #define OCFS2_SIMPLE_DIR_EXTEND_CREDITS (2)
/* file update (nlink, etc) + directory mtime/ctime + dir entry block + quota * update on dir + index leaf + dx root update for free list +
* previous dirblock update in the free list */ staticinlineint ocfs2_link_credits(struct super_block *sb)
{ return 2 * OCFS2_INODE_UPDATE_CREDITS + 4 +
ocfs2_quota_trans_credits(sb);
}
/* inode + dir inode (if we unlink a dir), + dir entry block + orphan
* dir inode link + dir inode index leaf + dir index root */ staticinlineint ocfs2_unlink_credits(struct super_block *sb)
{ /* The quota update from ocfs2_link_credits is unused here... */ return 2 * OCFS2_INODE_UPDATE_CREDITS + 3 + ocfs2_link_credits(sb);
}
/* dinode + orphan dir dinode + inode alloc dinode + orphan dir entry + * inode alloc group descriptor + orphan dir index root +
* orphan dir index leaf */ #define OCFS2_DELETE_INODE_CREDITS (3 * OCFS2_INODE_UPDATE_CREDITS + 4)
/* dinode + orphan dir dinode + extent tree leaf block + orphan dir entry +
* orphan dir index root + orphan dir index leaf */ #define OCFS2_INODE_ADD_TO_ORPHAN_CREDITS (2 * OCFS2_INODE_UPDATE_CREDITS + 4) #define OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS OCFS2_INODE_ADD_TO_ORPHAN_CREDITS
/* dinode update, old dir dinode update, new dir dinode update, old * dir dir entry, new dir dir entry, dir entry update for renaming
* directory + target unlink + 3 x dir index leaves */ staticinlineint ocfs2_rename_credits(struct super_block *sb)
{ return 3 * OCFS2_INODE_UPDATE_CREDITS + 6 + ocfs2_unlink_credits(sb);
}
/* inode update, new refcount block and its allocation credits. */ #define OCFS2_REFCOUNT_TREE_CREATE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1 \
+ OCFS2_SUBALLOC_ALLOC)
/* inode and the refcount block update. */ #define OCFS2_REFCOUNT_TREE_SET_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* * inode and the refcount block update. * It doesn't include the credits for sub alloc change. * So if we need to free the bit, OCFS2_SUBALLOC_FREE needs to be added.
*/ #define OCFS2_REFCOUNT_TREE_REMOVE_CREDITS (OCFS2_INODE_UPDATE_CREDITS + 1)
/* 2 metadata alloc, 2 new blocks and root refcount block */ #define OCFS2_EXPAND_REFCOUNT_TREE_CREDITS (OCFS2_SUBALLOC_ALLOC * 2 + 3)
/* * Please note that the caller must make sure that root_el is the root * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise * the result may be wrong.
*/ staticinlineint ocfs2_calc_extend_credits(struct super_block *sb, struct ocfs2_extent_list *root_el)
{ int bitmap_blocks, sysfile_bitmap_blocks, extent_blocks;
/* we might need to shift tree depth so lets assume an * absolute worst case of complete fragmentation. Even with * that, we only need one update for the dinode, and then * however many metadata chunks needed * a remaining suballoc
* alloc. */
sysfile_bitmap_blocks = 1 +
(OCFS2_SUBALLOC_ALLOC - 1) * ocfs2_extend_meta_needed(root_el);
/* this does not include *new* metadata blocks, which are * accounted for in sysfile_bitmap_blocks. root_el + * prev. last_eb_blk + blocks along edge of tree. * calc_symlink_credits passes because we just need 1
* credit for the dinode there. */
extent_blocks = 1 + 1 + le16_to_cpu(root_el->l_tree_depth);
/* * Allocating a discontiguous block group requires the credits from * ocfs2_calc_group_alloc_credits() as well as enough credits to fill * the group descriptor's extent list. The caller already has started * the transaction with ocfs2_calc_group_alloc_credits(). They extend * it with these credits.
*/ staticinlineint ocfs2_calc_bg_discontig_credits(struct super_block *sb)
{ return ocfs2_extent_recs_per_gd(sb);
}
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