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Diffstat (limited to 'include/linux/jbd.h')
| -rw-r--r-- | include/linux/jbd.h | 1047 |
1 files changed, 0 insertions, 1047 deletions
diff --git a/include/linux/jbd.h b/include/linux/jbd.h deleted file mode 100644 index d326152..0000000 --- a/include/linux/jbd.h +++ /dev/null @@ -1,1047 +0,0 @@ -/* - * linux/include/linux/jbd.h - * - * Written by Stephen C. Tweedie <sct@redhat.com> - * - * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved - * - * This file is part of the Linux kernel and is made available under - * the terms of the GNU General Public License, version 2, or at your - * option, any later version, incorporated herein by reference. - * - * Definitions for transaction data structures for the buffer cache - * filesystem journaling support. - */ - -#ifndef _LINUX_JBD_H -#define _LINUX_JBD_H - -/* Allow this file to be included directly into e2fsprogs */ -#ifndef __KERNEL__ -#include "jfs_compat.h" -#define JFS_DEBUG -#define jfs_debug jbd_debug -#else - -#include <linux/types.h> -#include <linux/buffer_head.h> -#include <linux/journal-head.h> -#include <linux/stddef.h> -#include <linux/mutex.h> -#include <linux/timer.h> -#include <linux/lockdep.h> -#include <linux/slab.h> - -#define journal_oom_retry 1 - -/* - * Define JBD_PARANOID_IOFAIL to cause a kernel BUG() if ext3 finds - * certain classes of error which can occur due to failed IOs. Under - * normal use we want ext3 to continue after such errors, because - * hardware _can_ fail, but for debugging purposes when running tests on - * known-good hardware we may want to trap these errors. - */ -#undef JBD_PARANOID_IOFAIL - -/* - * The default maximum commit age, in seconds. - */ -#define JBD_DEFAULT_MAX_COMMIT_AGE 5 - -#ifdef CONFIG_JBD_DEBUG -/* - * Define JBD_EXPENSIVE_CHECKING to enable more expensive internal - * consistency checks. By default we don't do this unless - * CONFIG_JBD_DEBUG is on. - */ -#define JBD_EXPENSIVE_CHECKING -extern u8 journal_enable_debug; - -void __jbd_debug(int level, const char *file, const char *func, - unsigned int line, const char *fmt, ...); - -#define jbd_debug(n, fmt, a...) \ - __jbd_debug((n), __FILE__, __func__, __LINE__, (fmt), ##a) -#else -#define jbd_debug(n, fmt, a...) /**/ -#endif - -static inline void *jbd_alloc(size_t size, gfp_t flags) -{ - return (void *)__get_free_pages(flags, get_order(size)); -} - -static inline void jbd_free(void *ptr, size_t size) -{ - free_pages((unsigned long)ptr, get_order(size)); -} - -#define JFS_MIN_JOURNAL_BLOCKS 1024 - - -/** - * typedef handle_t - The handle_t type represents a single atomic update being performed by some process. - * - * All filesystem modifications made by the process go - * through this handle. Recursive operations (such as quota operations) - * are gathered into a single update. - * - * The buffer credits field is used to account for journaled buffers - * being modified by the running process. To ensure that there is - * enough log space for all outstanding operations, we need to limit the - * number of outstanding buffers possible at any time. When the - * operation completes, any buffer credits not used are credited back to - * the transaction, so that at all times we know how many buffers the - * outstanding updates on a transaction might possibly touch. - * - * This is an opaque datatype. - **/ -typedef struct handle_s handle_t; /* Atomic operation type */ - - -/** - * typedef journal_t - The journal_t maintains all of the journaling state information for a single filesystem. - * - * journal_t is linked to from the fs superblock structure. - * - * We use the journal_t to keep track of all outstanding transaction - * activity on the filesystem, and to manage the state of the log - * writing process. - * - * This is an opaque datatype. - **/ -typedef struct journal_s journal_t; /* Journal control structure */ -#endif - -/* - * Internal structures used by the logging mechanism: - */ - -#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ - -/* - * On-disk structures - */ - -/* - * Descriptor block types: - */ - -#define JFS_DESCRIPTOR_BLOCK 1 -#define JFS_COMMIT_BLOCK 2 -#define JFS_SUPERBLOCK_V1 3 -#define JFS_SUPERBLOCK_V2 4 -#define JFS_REVOKE_BLOCK 5 - -/* - * Standard header for all descriptor blocks: - */ -typedef struct journal_header_s -{ - __be32 h_magic; - __be32 h_blocktype; - __be32 h_sequence; -} journal_header_t; - - -/* - * The block tag: used to describe a single buffer in the journal - */ -typedef struct journal_block_tag_s -{ - __be32 t_blocknr; /* The on-disk block number */ - __be32 t_flags; /* See below */ -} journal_block_tag_t; - -/* - * The revoke descriptor: used on disk to describe a series of blocks to - * be revoked from the log - */ -typedef struct journal_revoke_header_s -{ - journal_header_t r_header; - __be32 r_count; /* Count of bytes used in the block */ -} journal_revoke_header_t; - - -/* Definitions for the journal tag flags word: */ -#define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */ -#define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */ -#define JFS_FLAG_DELETED 4 /* block deleted by this transaction */ -#define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */ - - -/* - * The journal superblock. All fields are in big-endian byte order. - */ -typedef struct journal_superblock_s -{ -/* 0x0000 */ - journal_header_t s_header; - -/* 0x000C */ - /* Static information describing the journal */ - __be32 s_blocksize; /* journal device blocksize */ - __be32 s_maxlen; /* total blocks in journal file */ - __be32 s_first; /* first block of log information */ - -/* 0x0018 */ - /* Dynamic information describing the current state of the log */ - __be32 s_sequence; /* first commit ID expected in log */ - __be32 s_start; /* blocknr of start of log */ - -/* 0x0020 */ - /* Error value, as set by journal_abort(). */ - __be32 s_errno; - -/* 0x0024 */ - /* Remaining fields are only valid in a version-2 superblock */ - __be32 s_feature_compat; /* compatible feature set */ - __be32 s_feature_incompat; /* incompatible feature set */ - __be32 s_feature_ro_compat; /* readonly-compatible feature set */ -/* 0x0030 */ - __u8 s_uuid[16]; /* 128-bit uuid for journal */ - -/* 0x0040 */ - __be32 s_nr_users; /* Nr of filesystems sharing log */ - - __be32 s_dynsuper; /* Blocknr of dynamic superblock copy*/ - -/* 0x0048 */ - __be32 s_max_transaction; /* Limit of journal blocks per trans.*/ - __be32 s_max_trans_data; /* Limit of data blocks per trans. */ - -/* 0x0050 */ - __u32 s_padding[44]; - -/* 0x0100 */ - __u8 s_users[16*48]; /* ids of all fs'es sharing the log */ -/* 0x0400 */ -} journal_superblock_t; - -#define JFS_HAS_COMPAT_FEATURE(j,mask) \ - ((j)->j_format_version >= 2 && \ - ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) -#define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \ - ((j)->j_format_version >= 2 && \ - ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask)))) -#define JFS_HAS_INCOMPAT_FEATURE(j,mask) \ - ((j)->j_format_version >= 2 && \ - ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask)))) - -#define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001 - -/* Features known to this kernel version: */ -#define JFS_KNOWN_COMPAT_FEATURES 0 -#define JFS_KNOWN_ROCOMPAT_FEATURES 0 -#define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE - -#ifdef __KERNEL__ - -#include <linux/fs.h> -#include <linux/sched.h> - -enum jbd_state_bits { - BH_JBD /* Has an attached ext3 journal_head */ - = BH_PrivateStart, - BH_JWrite, /* Being written to log (@@@ DEBUGGING) */ - BH_Freed, /* Has been freed (truncated) */ - BH_Revoked, /* Has been revoked from the log */ - BH_RevokeValid, /* Revoked flag is valid */ - BH_JBDDirty, /* Is dirty but journaled */ - BH_State, /* Pins most journal_head state */ - BH_JournalHead, /* Pins bh->b_private and jh->b_bh */ - BH_Unshadow, /* Dummy bit, for BJ_Shadow wakeup filtering */ - BH_JBDPrivateStart, /* First bit available for private use by FS */ -}; - -BUFFER_FNS(JBD, jbd) -BUFFER_FNS(JWrite, jwrite) -BUFFER_FNS(JBDDirty, jbddirty) -TAS_BUFFER_FNS(JBDDirty, jbddirty) -BUFFER_FNS(Revoked, revoked) -TAS_BUFFER_FNS(Revoked, revoked) -BUFFER_FNS(RevokeValid, revokevalid) -TAS_BUFFER_FNS(RevokeValid, revokevalid) -BUFFER_FNS(Freed, freed) - -#include <linux/jbd_common.h> - -#define J_ASSERT(assert) BUG_ON(!(assert)) - -#define J_ASSERT_BH(bh, expr) J_ASSERT(expr) -#define J_ASSERT_JH(jh, expr) J_ASSERT(expr) - -#if defined(JBD_PARANOID_IOFAIL) -#define J_EXPECT(expr, why...) J_ASSERT(expr) -#define J_EXPECT_BH(bh, expr, why...) J_ASSERT_BH(bh, expr) -#define J_EXPECT_JH(jh, expr, why...) J_ASSERT_JH(jh, expr) -#else -#define __journal_expect(expr, why...) \ - ({ \ - int val = (expr); \ - if (!val) { \ - printk(KERN_ERR \ - "EXT3-fs unexpected failure: %s;\n",# expr); \ - printk(KERN_ERR why "\n"); \ - } \ - val; \ - }) -#define J_EXPECT(expr, why...) __journal_expect(expr, ## why) -#define J_EXPECT_BH(bh, expr, why...) __journal_expect(expr, ## why) -#define J_EXPECT_JH(jh, expr, why...) __journal_expect(expr, ## why) -#endif - -struct jbd_revoke_table_s; - -/** - * struct handle_s - this is the concrete type associated with handle_t. - * @h_transaction: Which compound transaction is this update a part of? - * @h_buffer_credits: Number of remaining buffers we are allowed to dirty. - * @h_ref: Reference count on this handle - * @h_err: Field for caller's use to track errors through large fs operations - * @h_sync: flag for sync-on-close - * @h_jdata: flag to force data journaling - * @h_aborted: flag indicating fatal error on handle - * @h_lockdep_map: lockdep info for debugging lock problems - */ -struct handle_s -{ - /* Which compound transaction is this update a part of? */ - transaction_t *h_transaction; - - /* Number of remaining buffers we are allowed to dirty: */ - int h_buffer_credits; - - /* Reference count on this handle */ - int h_ref; - - /* Field for caller's use to track errors through large fs */ - /* operations */ - int h_err; - - /* Flags [no locking] */ - unsigned int h_sync: 1; /* sync-on-close */ - unsigned int h_jdata: 1; /* force data journaling */ - unsigned int h_aborted: 1; /* fatal error on handle */ - -#ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lockdep_map h_lockdep_map; -#endif -}; - - -/* The transaction_t type is the guts of the journaling mechanism. It - * tracks a compound transaction through its various states: - * - * RUNNING: accepting new updates - * LOCKED: Updates still running but we don't accept new ones - * RUNDOWN: Updates are tidying up but have finished requesting - * new buffers to modify (state not used for now) - * FLUSH: All updates complete, but we are still writing to disk - * COMMIT: All data on disk, writing commit record - * FINISHED: We still have to keep the transaction for checkpointing. - * - * The transaction keeps track of all of the buffers modified by a - * running transaction, and all of the buffers committed but not yet - * flushed to home for finished transactions. - */ - -/* - * Lock ranking: - * - * j_list_lock - * ->jbd_lock_bh_journal_head() (This is "innermost") - * - * j_state_lock - * ->jbd_lock_bh_state() - * - * jbd_lock_bh_state() - * ->j_list_lock - * - * j_state_lock - * ->t_handle_lock - * - * j_state_lock - * ->j_list_lock (journal_unmap_buffer) - * - */ - -struct transaction_s -{ - /* Pointer to the journal for this transaction. [no locking] */ - journal_t *t_journal; - - /* Sequence number for this transaction [no locking] */ - tid_t t_tid; - - /* - * Transaction's current state - * [no locking - only kjournald alters this] - * [j_list_lock] guards transition of a transaction into T_FINISHED - * state and subsequent call of __journal_drop_transaction() - * FIXME: needs barriers - * KLUDGE: [use j_state_lock] - */ - enum { - T_RUNNING, - T_LOCKED, - T_FLUSH, - T_COMMIT, - T_COMMIT_RECORD, - T_FINISHED - } t_state; - - /* - * Where in the log does this transaction's commit start? [no locking] - */ - unsigned int t_log_start; - - /* Number of buffers on the t_buffers list [j_list_lock] */ - int t_nr_buffers; - - /* - * Doubly-linked circular list of all buffers reserved but not yet - * modified by this transaction [j_list_lock] - */ - struct journal_head *t_reserved_list; - - /* - * Doubly-linked circular list of all buffers under writeout during - * commit [j_list_lock] - */ - struct journal_head *t_locked_list; - - /* - * Doubly-linked circular list of all metadata buffers owned by this - * transaction [j_list_lock] - */ - struct journal_head *t_buffers; - - /* - * Doubly-linked circular list of all data buffers still to be - * flushed before this transaction can be committed [j_list_lock] - */ - struct journal_head *t_sync_datalist; - - /* - * Doubly-linked circular list of all forget buffers (superseded - * buffers which we can un-checkpoint once this transaction commits) - * [j_list_lock] - */ - struct journal_head *t_forget; - - /* - * Doubly-linked circular list of all buffers still to be flushed before - * this transaction can be checkpointed. [j_list_lock] - */ - struct journal_head *t_checkpoint_list; - - /* - * Doubly-linked circular list of all buffers submitted for IO while - * checkpointing. [j_list_lock] - */ - struct journal_head *t_checkpoint_io_list; - - /* - * Doubly-linked circular list of temporary buffers currently undergoing - * IO in the log [j_list_lock] - */ - struct journal_head *t_iobuf_list; - - /* - * Doubly-linked circular list of metadata buffers being shadowed by log - * IO. The IO buffers on the iobuf list and the shadow buffers on this - * list match each other one for one at all times. [j_list_lock] - */ - struct journal_head *t_shadow_list; - - /* - * Doubly-linked circular list of control buffers being written to the - * log. [j_list_lock] - */ - struct journal_head *t_log_list; - - /* - * Protects info related to handles - */ - spinlock_t t_handle_lock; - - /* - * Number of outstanding updates running on this transaction - * [t_handle_lock] - */ - int t_updates; - - /* - * Number of buffers reserved for use by all handles in this transaction - * handle but not yet modified. [t_handle_lock] - */ - int t_outstanding_credits; - - /* - * Forward and backward links for the circular list of all transactions - * awaiting checkpoint. [j_list_lock] - */ - transaction_t *t_cpnext, *t_cpprev; - - /* - * When will the transaction expire (become due for commit), in jiffies? - * [no locking] - */ - unsigned long t_expires; - - /* - * When this transaction started, in nanoseconds [no locking] - */ - ktime_t t_start_time; - - /* - * How many handles used this transaction? [t_handle_lock] - */ - int t_handle_count; -}; - -/** - * struct journal_s - this is the concrete type associated with journal_t. - * @j_flags: General journaling state flags - * @j_errno: Is there an outstanding uncleared error on the journal (from a - * prior abort)? - * @j_sb_buffer: First part of superblock buffer - * @j_superblock: Second part of superblock buffer - * @j_format_version: Version of the superblock format - * @j_state_lock: Protect the various scalars in the journal - * @j_barrier_count: Number of processes waiting to create a barrier lock - * @j_running_transaction: The current running transaction.. - * @j_committing_transaction: the transaction we are pushing to disk - * @j_checkpoint_transactions: a linked circular list of all transactions - * waiting for checkpointing - * @j_wait_transaction_locked: Wait queue for waiting for a locked transaction - * to start committing, or for a barrier lock to be released - * @j_wait_logspace: Wait queue for waiting for checkpointing to complete - * @j_wait_done_commit: Wait queue for waiting for commit to complete - * @j_wait_checkpoint: Wait queue to trigger checkpointing - * @j_wait_commit: Wait queue to trigger commit - * @j_wait_updates: Wait queue to wait for updates to complete - * @j_checkpoint_mutex: Mutex for locking against concurrent checkpoints - * @j_head: Journal head - identifies the first unused block in the journal - * @j_tail: Journal tail - identifies the oldest still-used block in the - * journal. - * @j_free: Journal free - how many free blocks are there in the journal? - * @j_first: The block number of the first usable block - * @j_last: The block number one beyond the last usable block - * @j_dev: Device where we store the journal - * @j_blocksize: blocksize for the location where we store the journal. - * @j_blk_offset: starting block offset for into the device where we store the - * journal - * @j_fs_dev: Device which holds the client fs. For internal journal this will - * be equal to j_dev - * @j_maxlen: Total maximum capacity of the journal region on disk. - * @j_list_lock: Protects the buffer lists and internal buffer state. - * @j_inode: Optional inode where we store the journal. If present, all journal - * block numbers are mapped into this inode via bmap(). - * @j_tail_sequence: Sequence number of the oldest transaction in the log - * @j_transaction_sequence: Sequence number of the next transaction to grant - * @j_commit_sequence: Sequence number of the most recently committed - * transaction - * @j_commit_request: Sequence number of the most recent transaction wanting - * commit - * @j_commit_waited: Sequence number of the most recent transaction someone - * is waiting for to commit. - * @j_uuid: Uuid of client object. - * @j_task: Pointer to the current commit thread for this journal - * @j_max_transaction_buffers: Maximum number of metadata buffers to allow in a - * single compound commit transaction - * @j_commit_interval: What is the maximum transaction lifetime before we begin - * a commit? - * @j_commit_timer: The timer used to wakeup the commit thread - * @j_revoke_lock: Protect the revoke table - * @j_revoke: The revoke table - maintains the list of revoked blocks in the - * current transaction. - * @j_revoke_table: alternate revoke tables for j_revoke - * @j_wbuf: array of buffer_heads for journal_commit_transaction - * @j_wbufsize: maximum number of buffer_heads allowed in j_wbuf, the - * number that will fit in j_blocksize - * @j_last_sync_writer: most recent pid which did a synchronous write - * @j_average_commit_time: the average amount of time in nanoseconds it - * takes to commit a transaction to the disk. - * @j_private: An opaque pointer to fs-private information. - */ - -struct journal_s -{ - /* General journaling state flags [j_state_lock] */ - unsigned long j_flags; - - /* - * Is there an outstanding uncleared error on the journal (from a prior - * abort)? [j_state_lock] - */ - int j_errno; - - /* The superblock buffer */ - struct buffer_head *j_sb_buffer; - journal_superblock_t *j_superblock; - - /* Version of the superblock format */ - int j_format_version; - - /* - * Protect the various scalars in the journal - */ - spinlock_t j_state_lock; - - /* - * Number of processes waiting to create a barrier lock [j_state_lock] - */ - int j_barrier_count; - - /* - * Transactions: The current running transaction... - * [j_state_lock] [caller holding open handle] - */ - transaction_t *j_running_transaction; - - /* - * the transaction we are pushing to disk - * [j_state_lock] [caller holding open handle] - */ - transaction_t *j_committing_transaction; - - /* - * ... and a linked circular list of all transactions waiting for - * checkpointing. [j_list_lock] - */ - transaction_t *j_checkpoint_transactions; - - /* - * Wait queue for waiting for a locked transaction to start committing, - * or for a barrier lock to be released - */ - wait_queue_head_t j_wait_transaction_locked; - - /* Wait queue for waiting for checkpointing to complete */ - wait_queue_head_t j_wait_logspace; - - /* Wait queue for waiting for commit to complete */ - wait_queue_head_t j_wait_done_commit; - - /* Wait queue to trigger checkpointing */ - wait_queue_head_t j_wait_checkpoint; - - /* Wait queue to trigger commit */ - wait_queue_head_t j_wait_commit; - - /* Wait queue to wait for updates to complete */ - wait_queue_head_t j_wait_updates; - - /* Semaphore for locking against concurrent checkpoints */ - struct mutex j_checkpoint_mutex; - - /* - * Journal head: identifies the first unused block in the journal. - * [j_state_lock] - */ - unsigned int j_head; - - /* - * Journal tail: identifies the oldest still-used block in the journal. - * [j_state_lock] - */ - unsigned int j_tail; - - /* - * Journal free: how many free blocks are there in the journal? - * [j_state_lock] - */ - unsigned int j_free; - - /* - * Journal start and end: the block numbers of the first usable block - * and one beyond the last usable block in the journal. [j_state_lock] - */ - unsigned int j_first; - unsigned int j_last; - - /* - * Device, blocksize and starting block offset for the location where we - * store the journal. - */ - struct block_device *j_dev; - int j_blocksize; - unsigned int j_blk_offset; - - /* - * Device which holds the client fs. For internal journal this will be - * equal to j_dev. - */ - struct block_device *j_fs_dev; - - /* Total maximum capacity of the journal region on disk. */ - unsigned int j_maxlen; - - /* - * Protects the buffer lists and internal buffer state. - */ - spinlock_t j_list_lock; - - /* Optional inode where we store the journal. If present, all */ - /* journal block numbers are mapped into this inode via */ - /* bmap(). */ - struct inode *j_inode; - - /* - * Sequence number of the oldest transaction in the log [j_state_lock] - */ - tid_t j_tail_sequence; - - /* - * Sequence number of the next transaction to grant [j_state_lock] - */ - tid_t j_transaction_sequence; - - /* - * Sequence number of the most recently committed transaction - * [j_state_lock]. - */ - tid_t j_commit_sequence; - - /* - * Sequence number of the most recent transaction wanting commit - * [j_state_lock] - */ - tid_t j_commit_request; - - /* - * Sequence number of the most recent transaction someone is waiting - * for to commit. - * [j_state_lock] - */ - tid_t j_commit_waited; - - /* - * Journal uuid: identifies the object (filesystem, LVM volume etc) - * backed by this journal. This will eventually be replaced by an array - * of uuids, allowing us to index multiple devices within a single - * journal and to perform atomic updates across them. - */ - __u8 j_uuid[16]; - - /* Pointer to the current commit thread for this journal */ - struct task_struct *j_task; - - /* - * Maximum number of metadata buffers to allow in a single compound - * commit transaction - */ - int j_max_transaction_buffers; - - /* - * What is the maximum transaction lifetime before we begin a commit? - */ - unsigned long j_commit_interval; - - /* The timer used to wakeup the commit thread: */ - struct timer_list j_commit_timer; - - /* - * The revoke table: maintains the list of revoked blocks in the - * current transaction. [j_revoke_lock] - */ - spinlock_t j_revoke_lock; - struct jbd_revoke_table_s *j_revoke; - struct jbd_revoke_table_s *j_revoke_table[2]; - - /* - * array of bhs for journal_commit_transaction - */ - struct buffer_head **j_wbuf; - int j_wbufsize; - - /* - * this is the pid of the last person to run a synchronous operation - * through the journal. - */ - pid_t j_last_sync_writer; - - /* - * the average amount of time in nanoseconds it takes to commit a - * transaction to the disk. [j_state_lock] - */ - u64 j_average_commit_time; - - /* - * An opaque pointer to fs-private information. ext3 puts its - * superblock pointer here - */ - void *j_private; -}; - -/* - * Journal flag definitions - */ -#define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */ -#define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */ -#define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */ -#define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */ -#define JFS_LOADED 0x010 /* The journal superblock has been loaded */ -#define JFS_BARRIER 0x020 /* Use IDE barriers */ -#define JFS_ABORT_ON_SYNCDATA_ERR 0x040 /* Abort the journal on file - * data write error in ordered - * mode */ - -/* - * Function declarations for the journaling transaction and buffer - * management - */ - -/* Filing buffers */ -extern void journal_unfile_buffer(journal_t *, struct journal_head *); -extern void __journal_unfile_buffer(struct journal_head *); -extern void __journal_refile_buffer(struct journal_head *); -extern void journal_refile_buffer(journal_t *, struct journal_head *); -extern void __journal_file_buffer(struct journal_head *, transaction_t *, int); -extern void __journal_free_buffer(struct journal_head *bh); -extern void journal_file_buffer(struct journal_head *, transaction_t *, int); -extern void __journal_clean_data_list(transaction_t *transaction); - -/* Log buffer allocation */ -extern struct journal_head * journal_get_descriptor_buffer(journal_t *); -int journal_next_log_block(journal_t *, unsigned int *); - -/* Commit management */ -extern void journal_commit_transaction(journal_t *); - -/* Checkpoint list management */ -int __journal_clean_checkpoint_list(journal_t *journal); -int __journal_remove_checkpoint(struct journal_head *); -void __journal_insert_checkpoint(struct journal_head *, transaction_t *); - -/* Buffer IO */ -extern int -journal_write_metadata_buffer(transaction_t *transaction, - struct journal_head *jh_in, - struct journal_head **jh_out, - unsigned int blocknr); - -/* Transaction locking */ -extern void __wait_on_journal (journal_t *); - -/* - * Journal locking. - * - * We need to lock the journal during transaction state changes so that nobody - * ever tries to take a handle on the running transaction while we are in the - * middle of moving it to the commit phase. j_state_lock does this. - * - * Note that the locking is completely interrupt unsafe. We never touch - * journal structures from interrupts. - */ - -static inline handle_t *journal_current_handle(void) -{ - return current->journal_info; -} - -/* The journaling code user interface: - * - * Create and destroy handles - * Register buffer modifications against the current transaction. - */ - -extern handle_t *journal_start(journal_t *, int nblocks); -extern int journal_restart (handle_t *, int nblocks); -extern int journal_extend (handle_t *, int nblocks); -extern int journal_get_write_access(handle_t *, struct buffer_head *); -extern int journal_get_create_access (handle_t *, struct buffer_head *); -extern int journal_get_undo_access(handle_t *, struct buffer_head *); -extern int journal_dirty_data (handle_t *, struct buffer_head *); -extern int journal_dirty_metadata (handle_t *, struct buffer_head *); -extern void journal_release_buffer (handle_t *, struct buffer_head *); -extern int journal_forget (handle_t *, struct buffer_head *); -extern void journal_sync_buffer (struct buffer_head *); -extern void journal_invalidatepage(journal_t *, - struct page *, unsigned int, unsigned int); -extern int journal_try_to_free_buffers(journal_t *, struct page *, gfp_t); -extern int journal_stop(handle_t *); -extern int journal_flush (journal_t *); -extern void journal_lock_updates (journal_t *); -extern void journal_unlock_updates (journal_t *); - -extern journal_t * journal_init_dev(struct block_device *bdev, - struct block_device *fs_dev, - int start, int len, int bsize); -extern journal_t * journal_init_inode (struct inode *); -extern int journal_update_format (journal_t *); -extern int journal_check_used_features - (journal_t *, unsigned long, unsigned long, unsigned long); -extern int journal_check_available_features - (journal_t *, unsigned long, unsigned long, unsigned long); -extern int journal_set_features - (journal_t *, unsigned long, unsigned long, unsigned long); -extern int journal_create (journal_t *); -extern int journal_load (journal_t *journal); -extern int journal_destroy (journal_t *); -extern int journal_recover (journal_t *journal); -extern int journal_wipe (journal_t *, int); -extern int journal_skip_recovery (journal_t *); -extern void journal_update_sb_log_tail (journal_t *, tid_t, unsigned int, - int); -extern void journal_abort (journal_t *, int); -extern int journal_errno (journal_t *); -extern void journal_ack_err (journal_t *); -extern int journal_clear_err (journal_t *); -extern int journal_bmap(journal_t *, unsigned int, unsigned int *); -extern int journal_force_commit(journal_t *); - -/* - * journal_head management - */ -struct journal_head *journal_add_journal_head(struct buffer_head *bh); -struct journal_head *journal_grab_journal_head(struct buffer_head *bh); -void journal_put_journal_head(struct journal_head *jh); - -/* - * handle management - */ -extern struct kmem_cache *jbd_handle_cache; - -static inline handle_t *jbd_alloc_handle(gfp_t gfp_flags) -{ - return kmem_cache_zalloc(jbd_handle_cache, gfp_flags); -} - -static inline void jbd_free_handle(handle_t *handle) -{ - kmem_cache_free(jbd_handle_cache, handle); -} - -/* Primary revoke support */ -#define JOURNAL_REVOKE_DEFAULT_HASH 256 -extern int journal_init_revoke(journal_t *, int); -extern void journal_destroy_revoke_caches(void); -extern int journal_init_revoke_caches(void); - -extern void journal_destroy_revoke(journal_t *); -extern int journal_revoke (handle_t *, - unsigned int, struct buffer_head *); -extern int journal_cancel_revoke(handle_t *, struct journal_head *); -extern void journal_write_revoke_records(journal_t *, - transaction_t *, int); - -/* Recovery revoke support */ -extern int journal_set_revoke(journal_t *, unsigned int, tid_t); -extern int journal_test_revoke(journal_t *, unsigned int, tid_t); -extern void journal_clear_revoke(journal_t *); -extern void journal_switch_revoke_table(journal_t *journal); -extern void journal_clear_buffer_revoked_flags(journal_t *journal); - -/* - * The log thread user interface: - * - * Request space in the current transaction, and force transaction commit - * transitions on demand. - */ - -int __log_space_left(journal_t *); /* Called with journal locked */ -int log_start_commit(journal_t *journal, tid_t tid); -int __log_start_commit(journal_t *journal, tid_t tid); -int journal_start_commit(journal_t *journal, tid_t *tid); -int journal_force_commit_nested(journal_t *journal); -int log_wait_commit(journal_t *journal, tid_t tid); -int log_do_checkpoint(journal_t *journal); -int journal_trans_will_send_data_barrier(journal_t *journal, tid_t tid); - -void __log_wait_for_space(journal_t *journal); -extern void __journal_drop_transaction(journal_t *, transaction_t *); -extern int cleanup_journal_tail(journal_t *); - -/* - * is_journal_abort - * - * Simple test wrapper function to test the JFS_ABORT state flag. This - * bit, when set, indicates that we have had a fatal error somewhere, - * either inside the journaling layer or indicated to us by the client - * (eg. ext3), and that we and should not commit any further - * transactions. - */ - -static inline int is_journal_aborted(journal_t *journal) -{ - return journal->j_flags & JFS_ABORT; -} - -static inline int is_handle_aborted(handle_t *handle) -{ - if (handle->h_aborted) - return 1; - return is_journal_aborted(handle->h_transaction->t_journal); -} - -static inline void journal_abort_handle(handle_t *handle) -{ - handle->h_aborted = 1; -} - -#endif /* __KERNEL__ */ - -/* Comparison functions for transaction IDs: perform comparisons using - * modulo arithmetic so that they work over sequence number wraps. */ - -static inline int tid_gt(tid_t x, tid_t y) -{ - int difference = (x - y); - return (difference > 0); -} - -static inline int tid_geq(tid_t x, tid_t y) -{ - int difference = (x - y); - return (difference >= 0); -} - -extern int journal_blocks_per_page(struct inode *inode); - -/* - * Return the minimum number of blocks which must be free in the journal - * before a new transaction may be started. Must be called under j_state_lock. - */ -static inline int jbd_space_needed(journal_t *journal) -{ - int nblocks = journal->j_max_transaction_buffers; - if (journal->j_committing_transaction) - nblocks += journal->j_committing_transaction-> - t_outstanding_credits; - return nblocks; -} - -/* - * Definitions which augment the buffer_head layer - */ - -/* journaling buffer types */ -#define BJ_None 0 /* Not journaled */ -#define BJ_SyncData 1 /* Normal data: flush before commit */ -#define BJ_Metadata 2 /* Normal journaled metadata */ -#define BJ_Forget 3 /* Buffer superseded by this transaction */ -#define BJ_IO 4 /* Buffer is for temporary IO use */ -#define BJ_Shadow 5 /* Buffer contents being shadowed to the log */ -#define BJ_LogCtl 6 /* Buffer contains log descriptors */ -#define BJ_Reserved 7 /* Buffer is reserved for access by journal */ -#define BJ_Locked 8 /* Locked for I/O during commit */ -#define BJ_Types 9 - -extern int jbd_blocks_per_page(struct inode *inode); - -#ifdef __KERNEL__ - -#define buffer_trace_init(bh) do {} while (0) -#define print_buffer_fields(bh) do {} while (0) -#define print_buffer_trace(bh) do {} while (0) -#define BUFFER_TRACE(bh, info) do {} while (0) -#define BUFFER_TRACE2(bh, bh2, info) do {} while (0) -#define JBUFFER_TRACE(jh, info) do {} while (0) - -#endif /* __KERNEL__ */ - -#endif /* _LINUX_JBD_H */ |
