From 43ac88849b9a36948a606a64d94e0369ee7f2ba2 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Sat, 1 Apr 2006 00:40:33 +0000 Subject: Ext2fs cleanup from Garrett Kajmowicz. --- e2fsprogs/ext2fs/kernel-jbd.h | 849 +++++------------------------------------- 1 file changed, 87 insertions(+), 762 deletions(-) (limited to 'e2fsprogs/ext2fs/kernel-jbd.h') diff --git a/e2fsprogs/ext2fs/kernel-jbd.h b/e2fsprogs/ext2fs/kernel-jbd.h index 8a5de5e3e..56914ea47 100644 --- a/e2fsprogs/ext2fs/kernel-jbd.h +++ b/e2fsprogs/ext2fs/kernel-jbd.h @@ -16,91 +16,14 @@ #ifndef _LINUX_JBD_H #define _LINUX_JBD_H -#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || !defined(__KERNEL__) - -/* 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 -#include -#include -#endif - -#ifndef __GNUC__ -#define __FUNCTION__ "" -#endif - -#define journal_oom_retry 1 - -#ifdef __STDC__ -#ifdef __CONFIG_JBD_DEBUG__E2FS -/* - * Define JBD_EXPENSIVE_CHECKING to enable more expensive internal - * consistency checks. By default we don't do this unless - * __CONFIG_JBD_DEBUG__E2FS is on. - */ -#define JBD_EXPENSIVE_CHECKING -extern int journal_enable_debug; - -#define jbd_debug(n, f, a...) \ - do { \ - if ((n) <= journal_enable_debug) { \ - printk (KERN_DEBUG "(%s, %d): %s: ", \ - __FILE__, __LINE__, __FUNCTION__); \ - printk (f, ## a); \ - } \ - } while (0) -#else -#ifdef __GNUC__ -#define jbd_debug(f, a...) /**/ -#else -#define jbd_debug(f, ...) /**/ -#endif -#endif -#else -#define jbd_debug(x) /* AIX doesn't do STDC */ -#endif - -extern void * __jbd_kmalloc (char *where, size_t size, int flags, int retry); -#define jbd_kmalloc(size, flags) \ - __jbd_kmalloc(__FUNCTION__, (size), (flags), journal_oom_retry) -#define jbd_rep_kmalloc(size, flags) \ - __jbd_kmalloc(__FUNCTION__, (size), (flags), 1) - -#define JFS_MIN_JOURNAL_BLOCKS 1024 - -#ifdef __KERNEL__ -typedef struct handle_s handle_t; /* Atomic operation type */ -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 +#include +#include +#include "ext2fs/ext2fs.h" /* * Standard header for all descriptor blocks: */ + typedef struct journal_header_s { __u32 h_magic; @@ -108,32 +31,17 @@ typedef struct journal_header_s __u32 h_sequence; } journal_header_t; - -/* - * The block tag: used to describe a single buffer in the journal - */ -typedef struct journal_block_tag_s -{ - __u32 t_blocknr; /* The on-disk block number */ - __u32 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 + * This is the global e2fsck structure. */ -typedef struct journal_revoke_header_s -{ - journal_header_t r_header; - int r_count; /* Count of bytes used in the block */ -} journal_revoke_header_t; +typedef struct e2fsck_struct *e2fsck_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 */ +struct inode { + e2fsck_t i_ctx; + ext2_ino_t i_ino; + struct ext2_inode i_ext2; +}; /* @@ -184,6 +92,58 @@ typedef struct journal_superblock_s /* 0x0400 */ } journal_superblock_t; + +extern int journal_blocks_per_page(struct inode *inode); +extern int jbd_blocks_per_page(struct inode *inode); + +#define JFS_MIN_JOURNAL_BLOCKS 1024 + + +/* + * Internal structures used by the logging mechanism: + */ + +#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */ + +/* + * 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 + +/* + * The block tag: used to describe a single buffer in the journal + */ +typedef struct journal_block_tag_s +{ + __u32 t_blocknr; /* The on-disk block number */ + __u32 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; + int 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 */ + + + + #define JFS_HAS_COMPAT_FEATURE(j,mask) \ ((j)->j_format_version >= 2 && \ ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask)))) @@ -201,581 +161,59 @@ typedef struct journal_superblock_s #define JFS_KNOWN_ROCOMPAT_FEATURES 0 #define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE -#ifdef __KERNEL__ - -#include -#include - -#define JBD_ASSERTIONS -#ifdef JBD_ASSERTIONS -#define J_ASSERT(assert) \ -do { \ - if (!(assert)) { \ - printk (KERN_EMERG \ - "Assertion failure in %s() at %s:%d: \"%s\"\n", \ - __FUNCTION__, __FILE__, __LINE__, # assert); \ - BUG(); \ - } \ -} while (0) - -#if defined(CONFIG_BUFFER_DEBUG) -void buffer_assertion_failure(struct buffer_head *bh); -#define J_ASSERT_BH(bh, expr) \ - do { \ - if (!(expr)) \ - buffer_assertion_failure(bh); \ - J_ASSERT(expr); \ - } while (0) -#define J_ASSERT_JH(jh, expr) J_ASSERT_BH(jh2bh(jh), expr) -#else -#define J_ASSERT_BH(bh, expr) J_ASSERT(expr) -#define J_ASSERT_JH(jh, expr) J_ASSERT(expr) -#endif - -#else -#define J_ASSERT(assert) -#endif /* JBD_ASSERTIONS */ - -enum jbd_state_bits { - BH_JWrite - = BH_PrivateStart, /* 1 if being written to log (@@@ DEBUGGING) */ - BH_Freed, /* 1 if buffer has been freed (truncated) */ - BH_Revoked, /* 1 if buffer has been revoked from the log */ - BH_RevokeValid, /* 1 if buffer revoked flag is valid */ - BH_JBDDirty, /* 1 if buffer is dirty but journaled */ -}; - -/* Return true if the buffer is one which JBD is managing */ -static inline int buffer_jbd(struct buffer_head *bh) -{ - return __buffer_state(bh, JBD); -} - -static inline struct buffer_head *jh2bh(struct journal_head *jh) -{ - return jh->b_bh; -} - -static inline struct journal_head *bh2jh(struct buffer_head *bh) -{ - return bh->b_private; -} - -struct jbd_revoke_table_s; - -/* 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. */ - -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; +/* Comparison functions for transaction IDs: perform comparisons using + * modulo arithmetic so that they work over sequence number wraps. */ - /* Field for caller's use to track errors through large fs - operations */ - int h_err; - /* Flags */ - 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 */ -}; +/* + * 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_AsyncData 2 /* writepage data: wait on it before commit */ +#define BJ_Metadata 3 /* Normal journaled metadata */ +#define BJ_Forget 4 /* Buffer superceded by this transaction */ +#define BJ_IO 5 /* Buffer is for temporary IO use */ +#define BJ_Shadow 6 /* Buffer contents being shadowed to the log */ +#define BJ_LogCtl 7 /* Buffer contains log descriptors */ +#define BJ_Reserved 8 /* Buffer is reserved for access by journal */ +#define BJ_Types 9 -/* 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. - */ -struct transaction_s -{ - /* Pointer to the journal for this transaction. */ - journal_t * t_journal; - - /* Sequence number for this transaction */ - tid_t t_tid; - - /* Transaction's current state */ - enum { - T_RUNNING, - T_LOCKED, - T_RUNDOWN, - T_FLUSH, - T_COMMIT, - T_FINISHED - } t_state; - - /* Where in the log does this transaction's commit start? */ - unsigned long t_log_start; - - /* Doubly-linked circular list of all inodes owned by this - transaction */ /* AKPM: unused */ - struct inode * t_ilist; - - /* Number of buffers on the t_buffers list */ - int t_nr_buffers; - - /* Doubly-linked circular list of all buffers reserved but not - yet modified by this transaction */ - struct journal_head * t_reserved_list; - - /* Doubly-linked circular list of all metadata buffers owned by this - transaction */ - struct journal_head * t_buffers; - - /* - * Doubly-linked circular list of all data buffers still to be - * flushed before this transaction can be committed. - * Protected by journal_datalist_lock. - */ - struct journal_head * t_sync_datalist; - - /* - * Doubly-linked circular list of all writepage data buffers - * still to be written before this transaction can be committed. - * Protected by journal_datalist_lock. - */ - struct journal_head * t_async_datalist; - - /* Doubly-linked circular list of all forget buffers (superceded - buffers which we can un-checkpoint once this transaction - commits) */ - struct journal_head * t_forget; - - /* - * Doubly-linked circular list of all buffers still to be - * flushed before this transaction can be checkpointed. - */ - /* Protected by journal_datalist_lock */ - struct journal_head * t_checkpoint_list; - - /* Doubly-linked circular list of temporary buffers currently - undergoing IO in the log */ - 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. */ - struct journal_head * t_shadow_list; - - /* Doubly-linked circular list of control buffers being written - to the log. */ - struct journal_head * t_log_list; - - /* Number of outstanding updates running on this transaction */ - int t_updates; - - /* Number of buffers reserved for use by all handles in this - * transaction handle but not yet modified. */ - int t_outstanding_credits; - - /* - * Forward and backward links for the circular list of all - * transactions awaiting checkpoint. - */ - /* Protected by journal_datalist_lock */ - transaction_t *t_cpnext, *t_cpprev; - - /* When will the transaction expire (become due for commit), in - * jiffies ? */ - unsigned long t_expires; - - /* How many handles used this transaction? */ - int t_handle_count; +struct kdev_s { + e2fsck_t k_ctx; + int k_dev; }; - -/* The journal_t maintains all of the journaling state information for a - * single filesystem. It 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. */ +typedef struct kdev_s *kdev_t; +typedef unsigned int tid_t; struct journal_s { - /* General journaling state flags */ unsigned long j_flags; - - /* Is there an outstanding uncleared error on the journal (from - * a prior abort)? */ int j_errno; - - /* The superblock buffer */ struct buffer_head * j_sb_buffer; - journal_superblock_t * j_superblock; - - /* Version of the superblock format */ + struct journal_superblock_s *j_superblock; int j_format_version; - - /* Number of processes waiting to create a barrier lock */ - int j_barrier_count; - - /* The barrier lock itself */ - struct semaphore j_barrier; - - /* Transactions: The current running transaction... */ - transaction_t * j_running_transaction; - - /* ... the transaction we are pushing to disk ... */ - transaction_t * j_committing_transaction; - - /* ... and a linked circular list of all transactions waiting - * for checkpointing. */ - /* Protected by journal_datalist_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 semaphore j_checkpoint_sem; - - /* The main journal lock, used by lock_journal() */ - struct semaphore j_sem; - - /* Journal head: identifies the first unused block in the journal. */ unsigned long j_head; - - /* Journal tail: identifies the oldest still-used block in the - * journal. */ unsigned long j_tail; - - /* Journal free: how many free blocks are there in the journal? */ unsigned long j_free; - - /* Journal start and end: the block numbers of the first usable - * block and one beyond the last usable block in the journal. */ unsigned long j_first, j_last; - - /* Device, blocksize and starting block offset for the location - * where we store the journal. */ kdev_t j_dev; + kdev_t j_fs_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. */ - kdev_t j_fs_dev; - - /* Total maximum capacity of the journal region on disk. */ unsigned int j_maxlen; - - /* 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 */ tid_t j_tail_sequence; - /* Sequence number of the next transaction to grant */ tid_t j_transaction_sequence; - /* Sequence number of the most recently committed transaction */ - tid_t j_commit_sequence; - /* Sequence number of the most recent transaction wanting commit */ - tid_t j_commit_request; - - /* 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; - int j_commit_timer_active; - - /* Link all journals together - system-wide */ - struct list_head j_all_journals; - - /* The revoke table: maintains the list of revoked blocks in the - current transaction. */ struct jbd_revoke_table_s *j_revoke; }; -/* - * 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 */ - -/* - * Function declarations for the journaling transaction and buffer - * management - */ - -/* Filing buffers */ -extern void __journal_unfile_buffer(struct journal_head *); -extern void journal_unfile_buffer(struct journal_head *); -extern void __journal_refile_buffer(struct journal_head *); -extern void journal_refile_buffer(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 *); -extern unsigned long journal_next_log_block(journal_t *); - -/* Commit management */ -extern void journal_commit_transaction(journal_t *); - -/* Checkpoint list management */ -int __journal_clean_checkpoint_list(journal_t *journal); -extern void journal_remove_checkpoint(struct journal_head *); -extern void __journal_remove_checkpoint(struct journal_head *); -extern void journal_insert_checkpoint(struct journal_head *, transaction_t *); -extern 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, - 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. - * - * Note that the locking is completely interrupt unsafe. We never touch - * journal structures from interrupts. - * - * In 2.2, the BKL was required for lock_journal. This is no longer - * the case. - */ - -static inline void lock_journal(journal_t *journal) -{ - down(&journal->j_sem); -} - -/* This returns zero if we acquired the semaphore */ -static inline int try_lock_journal(journal_t * journal) -{ - return down_trylock(&journal->j_sem); -} - -static inline void unlock_journal(journal_t * journal) -{ - up(&journal->j_sem); -} - - -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 handle_t *journal_try_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 *, int async); -extern int journal_dirty_metadata (handle_t *, struct buffer_head *); -extern void journal_release_buffer (handle_t *, struct buffer_head *); -extern void journal_forget (handle_t *, struct buffer_head *); -extern void journal_sync_buffer (struct buffer_head *); -extern int journal_flushpage(journal_t *, struct page *, unsigned long); -extern int journal_try_to_free_buffers(journal_t *, struct page *, int); -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(kdev_t dev, kdev_t 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 void 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_superblock (journal_t *, int); -extern void __journal_abort (journal_t *); -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 unsigned long journal_bmap(journal_t *journal, unsigned long blocknr); -extern int journal_force_commit(journal_t *journal); - -/* - * journal_head management - */ -extern struct journal_head - *journal_add_journal_head(struct buffer_head *bh); -extern void journal_remove_journal_head(struct buffer_head *bh); -extern void __journal_remove_journal_head(struct buffer_head *bh); -extern void journal_unlock_journal_head(struct journal_head *jh); - -/* 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 long, struct buffer_head *); -extern int journal_cancel_revoke(handle_t *, struct journal_head *); -extern void journal_write_revoke_records(journal_t *, transaction_t *); - -/* Recovery revoke support */ -extern int journal_set_revoke(journal_t *, unsigned long, tid_t); -extern int journal_test_revoke(journal_t *, unsigned long, tid_t); -extern void journal_clear_revoke(journal_t *); -extern void journal_brelse_array(struct buffer_head *b[], int n); - -/* The log thread user interface: - * - * Request space in the current transaction, and force transaction commit - * transitions on demand. - */ - -extern int log_space_left (journal_t *); /* Called with journal locked */ -extern tid_t log_start_commit (journal_t *, transaction_t *); -extern void log_wait_commit (journal_t *, tid_t); -extern int log_do_checkpoint (journal_t *, int); - -extern void log_wait_for_space(journal_t *, int nblocks); -extern void __journal_drop_transaction(journal_t *, transaction_t *); -extern int cleanup_journal_tail(journal_t *); - -/* Reduce journal memory usage by flushing */ -extern void shrink_journal_memory(void); - -/* Debugging code only: */ - -#define jbd_ENOSYS() \ -do { \ - printk (KERN_ERR "JBD unimplemented function " __FUNCTION__); \ - current->state = TASK_UNINTERRUPTIBLE; \ - schedule(); \ -} while (1) - -/* - * 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; -} - -/* Not all architectures define BUG() */ -#ifndef BUG -#define BUG() do { \ - printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \ - * ((char *) 0) = 0; \ - } while (0) -#endif /* BUG */ - -#else +typedef struct journal_s journal_t; extern int journal_recover (journal_t *journal); extern int journal_skip_recovery (journal_t *); @@ -792,119 +230,6 @@ extern void journal_clear_revoke(journal_t *); extern void journal_brelse_array(struct buffer_head *b[], int n); extern void journal_destroy_revoke(journal_t *); -#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); - -/* - * 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_AsyncData 2 /* writepage data: wait on it before commit */ -#define BJ_Metadata 3 /* Normal journaled metadata */ -#define BJ_Forget 4 /* Buffer superceded by this transaction */ -#define BJ_IO 5 /* Buffer is for temporary IO use */ -#define BJ_Shadow 6 /* Buffer contents being shadowed to the log */ -#define BJ_LogCtl 7 /* Buffer contains log descriptors */ -#define BJ_Reserved 8 /* Buffer is reserved for access by journal */ -#define BJ_Types 9 - -extern int jbd_blocks_per_page(struct inode *inode); - -#ifdef __KERNEL__ - -extern spinlock_t jh_splice_lock; -/* - * Once `expr1' has been found true, take jh_splice_lock - * and then reevaluate everything. - */ -#define SPLICE_LOCK(expr1, expr2) \ - ({ \ - int ret = (expr1); \ - if (ret) { \ - spin_lock(&jh_splice_lock); \ - ret = (expr1) && (expr2); \ - spin_unlock(&jh_splice_lock); \ - } \ - ret; \ - }) - -/* - * A number of buffer state predicates. They test for - * buffer_jbd() because they are used in core kernel code. - * - * These will be racy on SMP unless we're *sure* that the - * buffer won't be detached from the journalling system - * in parallel. - */ - -/* Return true if the buffer is on journal list `list' */ -static inline int buffer_jlist_eq(struct buffer_head *bh, int list) -{ - return SPLICE_LOCK(buffer_jbd(bh), bh2jh(bh)->b_jlist == list); -} - -/* Return true if this bufer is dirty wrt the journal */ -static inline int buffer_jdirty(struct buffer_head *bh) -{ - return buffer_jbd(bh) && __buffer_state(bh, JBDDirty); -} - -/* Return true if it's a data buffer which journalling is managing */ -static inline int buffer_jbd_data(struct buffer_head *bh) -{ - return SPLICE_LOCK(buffer_jbd(bh), - bh2jh(bh)->b_jlist == BJ_SyncData || - bh2jh(bh)->b_jlist == BJ_AsyncData); -} - -#ifdef CONFIG_SMP -#define assert_spin_locked(lock) J_ASSERT(spin_is_locked(lock)) -#else -#define assert_spin_locked(lock) do {} while(0) -#endif - -#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 /* CONFIG_JBD || CONFIG_JBD_MODULE || !__KERNEL__ */ - -/* - * Compatibility no-ops which allow the kernel to compile without CONFIG_JBD - * go here. - */ - -#if defined(__KERNEL__) && !(defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE)) -#define J_ASSERT(expr) do {} while (0) -#define J_ASSERT_BH(bh, expr) do {} while (0) -#define buffer_jbd(bh) 0 -#define buffer_jlist_eq(bh, val) 0 -#define journal_buffer_journal_lru(bh) 0 -#endif /* defined(__KERNEL__) && !defined(CONFIG_JBD) */ #endif /* _LINUX_JBD_H */ -- cgit v1.2.3