URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [reiserfs/] [journal.c] - Rev 1774
Go to most recent revision | Compare with Previous | Blame | View Log
/* ** Write ahead logging implementation copyright Chris Mason 2000 ** ** The background commits make this code very interelated, and ** overly complex. I need to rethink things a bit....The major players: ** ** journal_begin -- call with the number of blocks you expect to log. ** If the current transaction is too ** old, it will block until the current transaction is ** finished, and then start a new one. ** Usually, your transaction will get joined in with ** previous ones for speed. ** ** journal_join -- same as journal_begin, but won't block on the current ** transaction regardless of age. Don't ever call ** this. Ever. There are only two places it should be ** called from, and they are both inside this file. ** ** journal_mark_dirty -- adds blocks into this transaction. clears any flags ** that might make them get sent to disk ** and then marks them BH_JDirty. Puts the buffer head ** into the current transaction hash. ** ** journal_end -- if the current transaction is batchable, it does nothing ** otherwise, it could do an async/synchronous commit, or ** a full flush of all log and real blocks in the ** transaction. ** ** flush_old_commits -- if the current transaction is too old, it is ended and ** commit blocks are sent to disk. Forces commit blocks ** to disk for all backgrounded commits that have been ** around too long. ** -- Note, if you call this as an immediate flush from ** from within kupdate, it will ignore the immediate flag ** ** The commit thread -- a writer process for async commits. It allows a ** a process to request a log flush on a task queue. ** the commit will happen once the commit thread wakes up. ** The benefit here is the writer (with whatever ** related locks it has) doesn't have to wait for the ** log blocks to hit disk if it doesn't want to. */ #include <linux/config.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/sched.h> #include <asm/semaphore.h> #include <linux/vmalloc.h> #include <linux/reiserfs_fs.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/locks.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/smp_lock.h> /* the number of mounted filesystems. This is used to decide when to ** start and kill the commit thread */ static int reiserfs_mounted_fs_count = 0 ; /* wake this up when you add something to the commit thread task queue */ DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_wait) ; /* wait on this if you need to be sure you task queue entries have been run */ static DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_done) ; DECLARE_TASK_QUEUE(reiserfs_commit_thread_tq) ; #define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit structs at 4k */ #define BUFNR 64 /*read ahead */ /* cnode stat bits. Move these into reiserfs_fs.h */ #define BLOCK_FREED 2 /* this block was freed, and can't be written. */ #define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */ #define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */ /* flags for do_journal_end */ #define FLUSH_ALL 1 /* flush commit and real blocks */ #define COMMIT_NOW 2 /* end and commit this transaction */ #define WAIT 4 /* wait for the log blocks to hit the disk*/ /* state bits for the journal */ #define WRITERS_BLOCKED 1 /* set when new writers not allowed */ static int do_journal_end(struct reiserfs_transaction_handle *,struct super_block *,unsigned long nblocks,int flags) ; static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ; static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ; static int can_dirty(struct reiserfs_journal_cnode *cn) ; static int remove_from_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, struct buffer_head *bh, int remove_freed); static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks); static int release_journal_dev( struct super_block *super, struct reiserfs_journal *journal ); static void init_journal_hash(struct super_block *p_s_sb) { memset(SB_JOURNAL(p_s_sb)->j_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ; } /* ** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to ** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for ** more details. */ static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) { if (bh) { clear_bit(BH_Dirty, &bh->b_state) ; refile_buffer(bh) ; } return 0 ; } static struct reiserfs_bitmap_node * allocate_bitmap_node(struct super_block *p_s_sb) { struct reiserfs_bitmap_node *bn ; static int id = 0 ; bn = reiserfs_kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS, p_s_sb) ; if (!bn) { return NULL ; } bn->data = reiserfs_kmalloc(p_s_sb->s_blocksize, GFP_NOFS, p_s_sb) ; if (!bn->data) { reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ; return NULL ; } bn->id = id++ ; memset(bn->data, 0, p_s_sb->s_blocksize) ; INIT_LIST_HEAD(&bn->list) ; return bn ; } static struct reiserfs_bitmap_node * get_bitmap_node(struct super_block *p_s_sb) { struct reiserfs_bitmap_node *bn = NULL; struct list_head *entry = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ; SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes++ ; repeat: if(entry != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) { bn = list_entry(entry, struct reiserfs_bitmap_node, list) ; list_del(entry) ; memset(bn->data, 0, p_s_sb->s_blocksize) ; SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ; return bn ; } bn = allocate_bitmap_node(p_s_sb) ; if (!bn) { yield(); goto repeat ; } return bn ; } static inline void free_bitmap_node(struct super_block *p_s_sb, struct reiserfs_bitmap_node *bn) { SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes-- ; if (SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ; reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ; } else { list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ; SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ; } } static void allocate_bitmap_nodes(struct super_block *p_s_sb) { int i ; struct reiserfs_bitmap_node *bn = NULL ; for (i = 0 ; i < REISERFS_MIN_BITMAP_NODES ; i++) { bn = allocate_bitmap_node(p_s_sb) ; if (bn) { list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ; SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ; } else { break ; // this is ok, we'll try again when more are needed } } } static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block, struct reiserfs_list_bitmap *jb) { int bmap_nr = block / (p_s_sb->s_blocksize << 3) ; int bit_nr = block % (p_s_sb->s_blocksize << 3) ; if (!jb->bitmaps[bmap_nr]) { jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb) ; } set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data) ; return 0 ; } static void cleanup_bitmap_list(struct super_block *p_s_sb, struct reiserfs_list_bitmap *jb) { int i; for (i = 0 ; i < SB_BMAP_NR(p_s_sb) ; i++) { if (jb->bitmaps[i]) { free_bitmap_node(p_s_sb, jb->bitmaps[i]) ; jb->bitmaps[i] = NULL ; } } } /* ** only call this on FS unmount. */ static int free_list_bitmaps(struct super_block *p_s_sb, struct reiserfs_list_bitmap *jb_array) { int i ; struct reiserfs_list_bitmap *jb ; for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) { jb = jb_array + i ; jb->journal_list = NULL ; cleanup_bitmap_list(p_s_sb, jb) ; vfree(jb->bitmaps) ; jb->bitmaps = NULL ; } return 0; } static int free_bitmap_nodes(struct super_block *p_s_sb) { struct list_head *next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ; struct reiserfs_bitmap_node *bn ; while(next != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) { bn = list_entry(next, struct reiserfs_bitmap_node, list) ; list_del(next) ; reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ; reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ; next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ; SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ; } return 0 ; } /* ** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. ** jb_array is the array to be filled in. */ int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb, struct reiserfs_list_bitmap *jb_array, int bmap_nr) { int i ; int failed = 0 ; struct reiserfs_list_bitmap *jb ; int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *) ; for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) { jb = jb_array + i ; jb->journal_list = NULL ; jb->bitmaps = vmalloc( mem ) ; if (!jb->bitmaps) { reiserfs_warning(p_s_sb, "clm-2000, unable to allocate bitmaps for journal lists\n") ; failed = 1; break ; } memset(jb->bitmaps, 0, mem) ; } if (failed) { free_list_bitmaps(p_s_sb, jb_array) ; return -1 ; } return 0 ; } /* ** find an available list bitmap. If you can't find one, flush a commit list ** and try again */ static struct reiserfs_list_bitmap * get_list_bitmap(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) { int i,j ; struct reiserfs_list_bitmap *jb = NULL ; for (j = 0 ; j < (JOURNAL_NUM_BITMAPS * 3) ; j++) { i = SB_JOURNAL(p_s_sb)->j_list_bitmap_index ; SB_JOURNAL(p_s_sb)->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS ; jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ; if (SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) { flush_commit_list(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list, 1) ; if (!SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) { break ; } } else { break ; } } if (jb->journal_list) { /* double check to make sure if flushed correctly */ return NULL ; } jb->journal_list = jl ; return jb ; } /* ** allocates a new chunk of X nodes, and links them all together as a list. ** Uses the cnode->next and cnode->prev pointers ** returns NULL on failure */ static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) { struct reiserfs_journal_cnode *head ; int i ; if (num_cnodes <= 0) { return NULL ; } head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)) ; if (!head) { return NULL ; } memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)) ; head[0].prev = NULL ; head[0].next = head + 1 ; for (i = 1 ; i < num_cnodes; i++) { head[i].prev = head + (i - 1) ; head[i].next = head + (i + 1) ; /* if last one, overwrite it after the if */ } head[num_cnodes -1].next = NULL ; return head ; } /* ** pulls a cnode off the free list, or returns NULL on failure */ static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) { struct reiserfs_journal_cnode *cn ; reiserfs_check_lock_depth("get_cnode") ; if (SB_JOURNAL(p_s_sb)->j_cnode_free <= 0) { return NULL ; } SB_JOURNAL(p_s_sb)->j_cnode_used++ ; SB_JOURNAL(p_s_sb)->j_cnode_free-- ; cn = SB_JOURNAL(p_s_sb)->j_cnode_free_list ; if (!cn) { return cn ; } if (cn->next) { cn->next->prev = NULL ; } SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn->next ; memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; return cn ; } /* ** returns a cnode to the free list */ static void free_cnode(struct super_block *p_s_sb, struct reiserfs_journal_cnode *cn) { reiserfs_check_lock_depth("free_cnode") ; SB_JOURNAL(p_s_sb)->j_cnode_used-- ; SB_JOURNAL(p_s_sb)->j_cnode_free++ ; /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ cn->next = SB_JOURNAL(p_s_sb)->j_cnode_free_list ; if (SB_JOURNAL(p_s_sb)->j_cnode_free_list) { SB_JOURNAL(p_s_sb)->j_cnode_free_list->prev = cn ; } cn->prev = NULL ; /* not needed with the memset, but I might kill the memset, and forget to do this */ SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn ; } static int clear_prepared_bits(struct buffer_head *bh) { clear_bit(BH_JPrepared, &bh->b_state) ; return 0 ; } /* buffer is in current transaction */ inline int buffer_journaled(const struct buffer_head *bh) { if (bh) return test_bit(BH_JDirty, &((struct buffer_head *)bh)->b_state) ; else return 0 ; } /* disk block was taken off free list before being in a finished transation, or written to disk ** journal_new blocks can be reused immediately, for any purpose */ inline int buffer_journal_new(const struct buffer_head *bh) { if (bh) return test_bit(BH_JNew, &((struct buffer_head *)bh)->b_state) ; else return 0 ; } inline int mark_buffer_journal_new(struct buffer_head *bh) { if (bh) { set_bit(BH_JNew, &bh->b_state) ; } return 0 ; } inline int mark_buffer_not_journaled(struct buffer_head *bh) { if (bh) clear_bit(BH_JDirty, &bh->b_state) ; return 0 ; } /* utility function to force a BUG if it is called without the big ** kernel lock held. caller is the string printed just before calling BUG() */ void reiserfs_check_lock_depth(char *caller) { #ifdef CONFIG_SMP if (current->lock_depth < 0) { printk("%s called without kernel lock held\n", caller) ; show_reiserfs_locks() ; BUG() ; } #else ; #endif } /* return a cnode with same dev, block number and size in table, or null if not found */ static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct reiserfs_journal_cnode **table, kdev_t dev,long bl,int size) { struct reiserfs_journal_cnode *cn ; cn = journal_hash(table, dev, bl) ; while(cn) { if ((cn->blocknr == bl) && (cn->dev == dev)) return cn ; cn = cn->hnext ; } return (struct reiserfs_journal_cnode *)0 ; } /* returns a cnode with same size, block number and dev as bh in the current transaction hash. NULL if not found */ static inline struct reiserfs_journal_cnode *get_journal_hash(struct super_block *p_s_sb, struct buffer_head *bh) { struct reiserfs_journal_cnode *cn ; if (bh) { cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, bh->b_dev, bh->b_blocknr, bh->b_size) ; } else { return (struct reiserfs_journal_cnode *)0 ; } return cn ; } /* once upon a time, the journal would deadlock. a lot. Now, when ** CONFIG_REISERFS_CHECK is defined, anytime someone enters a ** transaction, it pushes itself into this ugly static list, and pops ** itself off before calling journal_end. I made a SysRq key to dump ** the list, and tell me what the writers are when I'm deadlocked. */ /* are you depending on the compiler to optimize this function away everywhere it is called? It is not obvious how this works, but I suppose debugging code need not be clear. -Hans */ static char *journal_writers[512] ; int push_journal_writer(char *s) { #ifdef CONFIG_REISERFS_CHECK int i ; for (i = 0 ; i < 512 ; i++) { if (!journal_writers[i]) { journal_writers[i] = s ; return i ; } } return -1 ; #else return 0 ; #endif } int pop_journal_writer(int index) { #ifdef CONFIG_REISERFS_CHECK if (index >= 0) { journal_writers[index] = NULL ; } #endif return 0 ; } int dump_journal_writers(void) { int i ; for (i = 0 ; i < 512 ; i++) { if (journal_writers[i]) { printk("%d: %s\n", i, journal_writers[i]) ; } } return 0 ; } /* ** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated ** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever ** being overwritten by a replay after crashing. ** ** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting ** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make ** sure you never write the block without logging it. ** ** next_zero_bit is a suggestion about the next block to try for find_forward. ** when bl is rejected because it is set in a journal list bitmap, we search ** for the next zero bit in the bitmap that rejected bl. Then, we return that ** through next_zero_bit for find_forward to try. ** ** Just because we return something in next_zero_bit does not mean we won't ** reject it on the next call to reiserfs_in_journal ** */ int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev, int bmap_nr, int bit_nr, int size, int search_all, unsigned int *next_zero_bit) { struct reiserfs_journal_cnode *cn ; struct reiserfs_list_bitmap *jb ; int i ; unsigned long bl; *next_zero_bit = 0 ; /* always start this at zero. */ /* we aren't logging all blocks are safe for reuse */ if (reiserfs_dont_log(p_s_sb)) { return 0 ; } PROC_INFO_INC( p_s_sb, journal.in_journal ); /* If we aren't doing a search_all, this is a metablock, and it will be logged before use. ** if we crash before the transaction that freed it commits, this transaction won't ** have committed either, and the block will never be written */ if (search_all) { for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) { PROC_INFO_INC( p_s_sb, journal.in_journal_bitmap ); jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ; if (jb->journal_list && jb->bitmaps[bmap_nr] && test_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data)) { *next_zero_bit = find_next_zero_bit((unsigned long *) (jb->bitmaps[bmap_nr]->data), p_s_sb->s_blocksize << 3, bit_nr+1) ; return 1 ; } } } bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr; /* is it in any old transactions? */ if (search_all && (cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, dev,bl,size))) { return 1; } /* is it in the current transaction. This should never happen */ if ((cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, dev,bl,size))) { return 1; } PROC_INFO_INC( p_s_sb, journal.in_journal_reusable ); /* safe for reuse */ return 0 ; } /* insert cn into table */ inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) { struct reiserfs_journal_cnode *cn_orig ; cn_orig = journal_hash(table, cn->dev, cn->blocknr) ; cn->hnext = cn_orig ; cn->hprev = NULL ; if (cn_orig) { cn_orig->hprev = cn ; } journal_hash(table, cn->dev, cn->blocknr) = cn ; } /* lock the current transaction */ inline static void lock_journal(struct super_block *p_s_sb) { PROC_INFO_INC( p_s_sb, journal.lock_journal ); while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_wlock)) > 0) { PROC_INFO_INC( p_s_sb, journal.lock_journal_wait ); sleep_on(&(SB_JOURNAL(p_s_sb)->j_wait)) ; } atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 1) ; } /* unlock the current transaction */ inline static void unlock_journal(struct super_block *p_s_sb) { atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wlock)) ; wake_up(&(SB_JOURNAL(p_s_sb)->j_wait)) ; } /* ** this used to be much more involved, and I'm keeping it just in case things get ugly again. ** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a ** transaction. */ static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) { struct reiserfs_list_bitmap *jb = jl->j_list_bitmap ; if (jb) { cleanup_bitmap_list(p_s_sb, jb) ; } jl->j_list_bitmap->journal_list = NULL ; jl->j_list_bitmap = NULL ; } /* ** if this journal list still has commit blocks unflushed, send them to disk. ** ** log areas must be flushed in order (transaction 2 can't commit before transaction 1) ** Before the commit block can by written, every other log block must be safely on disk ** */ static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { int i, count ; int index = 0 ; int bn ; int retry_count = 0 ; int orig_commit_left = 0 ; struct buffer_head *tbh = NULL ; struct reiserfs_journal_list *other_jl ; reiserfs_check_lock_depth("flush_commit_list") ; if (atomic_read(&jl->j_older_commits_done)) { return 0 ; } /* before we can put our commit blocks on disk, we have to make sure everyone older than ** us is on disk too */ if (jl->j_len <= 0) { return 0 ; } if (flushall) { /* we _must_ make sure the transactions are committed in order. Start with the ** index after this one, wrap all the way around */ index = (jl - SB_JOURNAL_LIST(s)) + 1 ; for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) { other_jl = SB_JOURNAL_LIST(s) + ( (index + i) % JOURNAL_LIST_COUNT) ; if (other_jl && other_jl != jl && other_jl->j_len > 0 && other_jl->j_trans_id > 0 && other_jl->j_trans_id <= jl->j_trans_id && (atomic_read(&(jl->j_older_commits_done)) == 0)) { flush_commit_list(s, other_jl, 0) ; } } } count = 0 ; /* don't flush the commit list for the current transactoin */ if (jl == ((SB_JOURNAL_LIST(s) + SB_JOURNAL_LIST_INDEX(s)))) { return 0 ; } /* make sure nobody is trying to flush this one at the same time */ if (atomic_read(&(jl->j_commit_flushing))) { sleep_on(&(jl->j_commit_wait)) ; if (flushall) { atomic_set(&(jl->j_older_commits_done), 1) ; } return 0 ; } /* this commit is done, exit */ if (atomic_read(&(jl->j_commit_left)) <= 0) { if (flushall) { atomic_set(&(jl->j_older_commits_done), 1) ; } return 0 ; } /* keeps others from flushing while we are flushing */ atomic_set(&(jl->j_commit_flushing), 1) ; if (jl->j_len > SB_JOURNAL_TRANS_MAX(s)) { reiserfs_panic(s, "journal-512: flush_commit_list: length is %lu, list number %d\n", jl->j_len, jl - SB_JOURNAL_LIST(s)) ; return 0 ; } orig_commit_left = atomic_read(&(jl->j_commit_left)) ; /* start by checking all the commit blocks in this transaction. ** Add anyone not on disk into tbh. Stop checking once commit_left <= 1, because that means we ** only have the commit block left */ retry: count = 0 ; for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 && i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start+i) % SB_ONDISK_JOURNAL_SIZE(s); tbh = journal_get_hash_table(s, bn) ; /* kill this sanity check */ if (count > (orig_commit_left + 2)) { reiserfs_panic(s, "journal-539: flush_commit_list: BAD count(%d) > orig_commit_left(%d)!\n", count, orig_commit_left) ; } if (tbh) { if (buffer_locked(tbh)) { /* wait on it, redo it just to make sure */ wait_on_buffer(tbh) ; if (!buffer_uptodate(tbh)) { reiserfs_panic(s, "journal-584, buffer write failed\n") ; } } if (buffer_dirty(tbh)) { reiserfs_warning(s, "journal-569: flush_commit_list, block already dirty!\n") ; } else { mark_buffer_dirty(tbh) ; } ll_rw_block(WRITE, 1, &tbh) ; count++ ; put_bh(tbh) ; /* once for our get_hash */ } } /* wait on everyone in tbh before writing commit block*/ if (count > 0) { for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 && i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s) ; tbh = journal_get_hash_table(s, bn) ; wait_on_buffer(tbh) ; if (!buffer_uptodate(tbh)) { reiserfs_panic(s, "journal-601, buffer write failed\n") ; } put_bh(tbh) ; /* once for our get_hash */ bforget(tbh) ; /* once due to original getblk in do_journal_end */ atomic_dec(&(jl->j_commit_left)) ; } } if (atomic_read(&(jl->j_commit_left)) != 1) { /* just the commit_bh left, flush it without calling getblk for everyone */ if (retry_count < 2) { reiserfs_warning(s, "journal-582: flush_commit_list, not all log blocks on disk yet, trying again\n") ; retry_count++ ; goto retry; } reiserfs_panic(s, "journal-563: flush_commit_list: BAD, j_commit_left is %u, should be 1\n", atomic_read(&(jl->j_commit_left))); } mark_buffer_dirty(jl->j_commit_bh) ; ll_rw_block(WRITE, 1, &(jl->j_commit_bh)) ; wait_on_buffer(jl->j_commit_bh) ; if (!buffer_uptodate(jl->j_commit_bh)) { reiserfs_panic(s, "journal-615: buffer write failed\n") ; } atomic_dec(&(jl->j_commit_left)) ; bforget(jl->j_commit_bh) ; /* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */ cleanup_freed_for_journal_list(s, jl) ; if (flushall) { atomic_set(&(jl->j_older_commits_done), 1) ; } atomic_set(&(jl->j_commit_flushing), 0) ; wake_up(&(jl->j_commit_wait)) ; s->s_dirt = 1 ; return 0 ; } /* ** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or ** returns NULL if it can't find anything */ static struct reiserfs_journal_list *find_newer_jl_for_cn(struct reiserfs_journal_cnode *cn) { kdev_t dev = cn->dev; unsigned long blocknr = cn->blocknr ; cn = cn->hprev ; while(cn) { if (cn->dev == dev && cn->blocknr == blocknr && cn->jlist) { return cn->jlist ; } cn = cn->hprev ; } return NULL ; } /* ** once all the real blocks have been flushed, it is safe to remove them from the ** journal list for this transaction. Aside from freeing the cnode, this also allows the ** block to be reallocated for data blocks if it had been deleted. */ static void remove_all_from_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, int debug) { struct buffer_head fake_bh ; struct reiserfs_journal_cnode *cn, *last ; cn = jl->j_realblock ; /* which is better, to lock once around the whole loop, or ** to lock for each call to remove_from_journal_list? */ while(cn) { if (cn->blocknr != 0) { if (debug) { reiserfs_warning(p_s_sb, "block %lu, bh is %d, state %ld\n", cn->blocknr, cn->bh ? 1: 0, cn->state) ; } fake_bh.b_blocknr = cn->blocknr ; fake_bh.b_dev = cn->dev ; cn->state = 0 ; remove_from_journal_list(p_s_sb, jl, &fake_bh, 1) ; } last = cn ; cn = cn->next ; free_cnode(p_s_sb, last) ; } jl->j_realblock = NULL ; } /* ** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block. ** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start ** releasing blocks in this transaction for reuse as data blocks. ** called by flush_journal_list, before it calls remove_all_from_journal_list ** */ static int _update_journal_header_block(struct super_block *p_s_sb, unsigned long offset, unsigned long trans_id) { struct reiserfs_journal_header *jh ; if (trans_id >= SB_JOURNAL(p_s_sb)->j_last_flush_trans_id) { if (buffer_locked((SB_JOURNAL(p_s_sb)->j_header_bh))) { wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ; if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) { reiserfs_panic(p_s_sb, "journal-699: buffer write failed\n") ; } } SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ; SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = offset ; jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ; jh->j_last_flush_trans_id = cpu_to_le32(trans_id) ; jh->j_first_unflushed_offset = cpu_to_le32(offset) ; jh->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ; set_bit(BH_Dirty, &(SB_JOURNAL(p_s_sb)->j_header_bh->b_state)) ; ll_rw_block(WRITE, 1, &(SB_JOURNAL(p_s_sb)->j_header_bh)) ; wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ; if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) { reiserfs_warning( p_s_sb, "reiserfs: journal-837: IO error during journal replay\n" ); return -EIO ; } } return 0 ; } static int update_journal_header_block(struct super_block *p_s_sb, unsigned long offset, unsigned long trans_id) { if (_update_journal_header_block(p_s_sb, offset, trans_id)) { reiserfs_panic(p_s_sb, "journal-712: buffer write failed\n") ; } return 0 ; } /* ** flush any and all journal lists older than you are ** can only be called from flush_journal_list */ static int flush_older_journal_lists(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, unsigned long trans_id) { int i, index ; struct reiserfs_journal_list *other_jl ; index = jl - SB_JOURNAL_LIST(p_s_sb) ; for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) { other_jl = SB_JOURNAL_LIST(p_s_sb) + ((index + i) % JOURNAL_LIST_COUNT) ; if (other_jl && other_jl->j_len > 0 && other_jl->j_trans_id > 0 && other_jl->j_trans_id < trans_id && other_jl != jl) { /* do not flush all */ flush_journal_list(p_s_sb, other_jl, 0) ; } } return 0 ; } static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) { if (buffer_journaled(bh)) { reiserfs_warning(NULL, "clm-2084: pinned buffer %lu:%s sent to disk\n", bh->b_blocknr, kdevname(bh->b_dev)) ; } mark_buffer_uptodate(bh, uptodate) ; unlock_buffer(bh) ; put_bh(bh) ; } static void submit_logged_buffer(struct buffer_head *bh) { lock_buffer(bh) ; get_bh(bh) ; bh->b_end_io = reiserfs_end_buffer_io_sync ; mark_buffer_notjournal_new(bh) ; clear_bit(BH_Dirty, &bh->b_state) ; submit_bh(WRITE, bh) ; } /* flush a journal list, both commit and real blocks ** ** always set flushall to 1, unless you are calling from inside ** flush_journal_list ** ** IMPORTANT. This can only be called while there are no journal writers, ** and the journal is locked. That means it can only be called from ** do_journal_end, or by journal_release */ static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { struct reiserfs_journal_list *pjl ; struct reiserfs_journal_cnode *cn, *last ; int count ; int was_jwait = 0 ; int was_dirty = 0 ; struct buffer_head *saved_bh ; unsigned long j_len_saved = jl->j_len ; if (j_len_saved <= 0) { return 0 ; } if (atomic_read(&SB_JOURNAL(s)->j_wcount) != 0) { reiserfs_warning(s, "clm-2048: flush_journal_list called with wcount %d\n", atomic_read(&SB_JOURNAL(s)->j_wcount)) ; } /* if someone is getting the commit list, we must wait for them */ while (atomic_read(&(jl->j_commit_flushing))) { sleep_on(&(jl->j_commit_wait)) ; } /* if someone is flushing this list, we must wait for them */ while (atomic_read(&(jl->j_flushing))) { sleep_on(&(jl->j_flush_wait)) ; } /* this list is now ours, we can change anything we want */ atomic_set(&(jl->j_flushing), 1) ; count = 0 ; if (j_len_saved > SB_JOURNAL_TRANS_MAX(s)) { reiserfs_panic(s, "journal-715: flush_journal_list, length is %lu, list number %d\n", j_len_saved, jl - SB_JOURNAL_LIST(s)) ; atomic_dec(&(jl->j_flushing)) ; return 0 ; } /* if all the work is already done, get out of here */ if (atomic_read(&(jl->j_nonzerolen)) <= 0 && atomic_read(&(jl->j_commit_left)) <= 0) { goto flush_older_and_return ; } /* start by putting the commit list on disk. This will also flush ** the commit lists of any olders transactions */ flush_commit_list(s, jl, 1) ; /* are we done now? */ if (atomic_read(&(jl->j_nonzerolen)) <= 0 && atomic_read(&(jl->j_commit_left)) <= 0) { goto flush_older_and_return ; } /* loop through each cnode, see if we need to write it, ** or wait on a more recent transaction, or just ignore it */ if (atomic_read(&(SB_JOURNAL(s)->j_wcount)) != 0) { reiserfs_panic(s, "journal-844: panic journal list is flushing, wcount is not 0\n") ; } cn = jl->j_realblock ; while(cn) { was_jwait = 0 ; was_dirty = 0 ; saved_bh = NULL ; /* blocknr of 0 is no longer in the hash, ignore it */ if (cn->blocknr == 0) { goto free_cnode ; } pjl = find_newer_jl_for_cn(cn) ; /* the order is important here. We check pjl to make sure we ** don't clear BH_JDirty_wait if we aren't the one writing this ** block to disk */ if (!pjl && cn->bh) { saved_bh = cn->bh ; /* we do this to make sure nobody releases the buffer while ** we are working with it */ get_bh(saved_bh) ; if (buffer_journal_dirty(saved_bh)) { was_jwait = 1 ; mark_buffer_notjournal_dirty(saved_bh) ; /* undo the inc from journal_mark_dirty */ put_bh(saved_bh) ; } if (can_dirty(cn)) { was_dirty = 1 ; } } /* if someone has this block in a newer transaction, just make ** sure they are commited, and don't try writing it to disk */ if (pjl) { flush_commit_list(s, pjl, 1) ; goto free_cnode ; } /* bh == NULL when the block got to disk on its own, OR, ** the block got freed in a future transaction */ if (saved_bh == NULL) { goto free_cnode ; } /* this should never happen. kupdate_one_transaction has this list ** locked while it works, so we should never see a buffer here that ** is not marked JDirty_wait */ if ((!was_jwait) && !buffer_locked(saved_bh)) { reiserfs_warning(s, "journal-813: BAD! buffer %lu %cdirty %cjwait, not in a newer tranasction\n", saved_bh->b_blocknr, was_dirty ? ' ' : '!', was_jwait ? ' ' : '!') ; } /* kupdate_one_transaction waits on the buffers it is writing, so we ** should never see locked buffers here */ if (buffer_locked(saved_bh)) { reiserfs_warning(s, "clm-2083: locked buffer %lu in flush_journal_list\n", saved_bh->b_blocknr) ; wait_on_buffer(saved_bh) ; if (!buffer_uptodate(saved_bh)) { reiserfs_panic(s, "journal-923: buffer write failed\n") ; } } if (was_dirty) { /* we inc again because saved_bh gets decremented at free_cnode */ get_bh(saved_bh) ; set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ; submit_logged_buffer(saved_bh) ; count++ ; } else { reiserfs_warning(s, "clm-2082: Unable to flush buffer %lu in flush_journal_list\n", saved_bh->b_blocknr) ; } free_cnode: last = cn ; cn = cn->next ; if (saved_bh) { /* we incremented this to keep others from taking the buffer head away */ put_bh(saved_bh) ; if (atomic_read(&(saved_bh->b_count)) < 0) { reiserfs_warning(s, "journal-945: saved_bh->b_count < 0\n") ; } } } if (count > 0) { cn = jl->j_realblock ; while(cn) { if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { if (!cn->bh) { reiserfs_panic(s, "journal-1011: cn->bh is NULL\n") ; } wait_on_buffer(cn->bh) ; if (!cn->bh) { reiserfs_panic(s, "journal-1012: cn->bh is NULL\n") ; } if (!buffer_uptodate(cn->bh)) { reiserfs_panic(s, "journal-949: buffer write failed\n") ; } refile_buffer(cn->bh) ; brelse(cn->bh) ; } cn = cn->next ; } } flush_older_and_return: /* before we can update the journal header block, we _must_ flush all ** real blocks from all older transactions to disk. This is because ** once the header block is updated, this transaction will not be ** replayed after a crash */ if (flushall) { flush_older_journal_lists(s, jl, jl->j_trans_id) ; } /* before we can remove everything from the hash tables for this ** transaction, we must make sure it can never be replayed ** ** since we are only called from do_journal_end, we know for sure there ** are no allocations going on while we are flushing journal lists. So, ** we only need to update the journal header block for the last list ** being flushed */ if (flushall) { update_journal_header_block(s, (jl->j_start + jl->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(s), jl->j_trans_id) ; } remove_all_from_journal_list(s, jl, 0) ; jl->j_len = 0 ; atomic_set(&(jl->j_nonzerolen), 0) ; jl->j_start = 0 ; jl->j_realblock = NULL ; jl->j_commit_bh = NULL ; jl->j_trans_id = 0 ; atomic_dec(&(jl->j_flushing)) ; wake_up(&(jl->j_flush_wait)) ; return 0 ; } static int kupdate_one_transaction(struct super_block *s, struct reiserfs_journal_list *jl) { struct reiserfs_journal_list *pjl ; /* previous list for this cn */ struct reiserfs_journal_cnode *cn, *walk_cn ; unsigned long blocknr ; int run = 0 ; int orig_trans_id = jl->j_trans_id ; struct buffer_head *saved_bh ; int ret = 0 ; /* if someone is getting the commit list, we must wait for them */ while (atomic_read(&(jl->j_commit_flushing))) { sleep_on(&(jl->j_commit_wait)) ; } /* if someone is flushing this list, we must wait for them */ while (atomic_read(&(jl->j_flushing))) { sleep_on(&(jl->j_flush_wait)) ; } /* was it flushed while we slept? */ if (jl->j_len <= 0 || jl->j_trans_id != orig_trans_id) { return 0 ; } /* this list is now ours, we can change anything we want */ atomic_set(&(jl->j_flushing), 1) ; loop_start: cn = jl->j_realblock ; while(cn) { saved_bh = NULL ; /* if the blocknr == 0, this has been cleared from the hash, ** skip it */ if (cn->blocknr == 0) { goto next ; } /* look for a more recent transaction that logged this ** buffer. Only the most recent transaction with a buffer in ** it is allowed to send that buffer to disk */ pjl = find_newer_jl_for_cn(cn) ; if (run == 0 && !pjl && cn->bh && buffer_journal_dirty(cn->bh) && can_dirty(cn)) { if (!test_bit(BH_JPrepared, &cn->bh->b_state)) { set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ; submit_logged_buffer(cn->bh) ; } else { /* someone else is using this buffer. We can't ** send it to disk right now because they might ** be changing/logging it. */ ret = 1 ; } } else if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { clear_bit(BLOCK_NEEDS_FLUSH, &cn->state) ; if (!pjl && cn->bh) { wait_on_buffer(cn->bh) ; } /* check again, someone could have logged while we scheduled */ pjl = find_newer_jl_for_cn(cn) ; /* before the JDirty_wait bit is set, the ** buffer is added to the hash list. So, if we are ** run in the middle of a do_journal_end, we will notice ** if this buffer was logged and added from the latest ** transaction. In this case, we don't want to decrement ** b_count */ if (!pjl && cn->bh && buffer_journal_dirty(cn->bh)) { blocknr = cn->blocknr ; walk_cn = cn ; saved_bh= cn->bh ; /* update all older transactions to show this block ** was flushed */ mark_buffer_notjournal_dirty(cn->bh) ; while(walk_cn) { if (walk_cn->bh && walk_cn->blocknr == blocknr && walk_cn->dev == cn->dev) { if (walk_cn->jlist) { atomic_dec(&(walk_cn->jlist->j_nonzerolen)) ; } walk_cn->bh = NULL ; } walk_cn = walk_cn->hnext ; } if (atomic_read(&saved_bh->b_count) < 1) { reiserfs_warning(s, "clm-2081: bad count on %lu\n", saved_bh->b_blocknr) ; } brelse(saved_bh) ; } } /* ** if the more recent transaction is committed to the log, ** this buffer can be considered flushed. Decrement our ** counters to reflect one less buffer that needs writing. ** ** note, this relies on all of the above code being ** schedule free once pjl comes back non-null. */ if (pjl && cn->bh && atomic_read(&pjl->j_commit_left) == 0) { atomic_dec(&cn->jlist->j_nonzerolen) ; cn->bh = NULL ; } next: cn = cn->next ; } /* the first run through the loop sends all the dirty buffers to ** ll_rw_block. ** the second run through the loop does all the accounting */ if (run++ == 0) { goto loop_start ; } atomic_set(&(jl->j_flushing), 0) ; wake_up(&(jl->j_flush_wait)) ; return ret ; } /* since we never give dirty buffers to bdflush/kupdate, we have to ** flush them ourselves. This runs through the journal lists, finds ** old metadata in need of flushing and sends it to disk. ** this does not end transactions, commit anything, or free ** cnodes. ** ** returns the highest transaction id that was flushed last time */ static unsigned long reiserfs_journal_kupdate(struct super_block *s) { struct reiserfs_journal_list *jl ; int i ; int start ; time_t age ; int ret = 0 ; start = SB_JOURNAL_LIST_INDEX(s) ; /* safety check to prevent flush attempts during a mount */ if (start < 0) { return 0 ; } i = (start + 1) % JOURNAL_LIST_COUNT ; while(i != start) { jl = SB_JOURNAL_LIST(s) + i ; age = CURRENT_TIME - jl->j_timestamp ; if (jl->j_len > 0 && // age >= (JOURNAL_MAX_COMMIT_AGE * 2) && atomic_read(&(jl->j_nonzerolen)) > 0 && atomic_read(&(jl->j_commit_left)) == 0) { if (jl->j_trans_id == SB_JOURNAL(s)->j_trans_id) { break ; } /* if ret was already 1, we want to preserve that */ ret |= kupdate_one_transaction(s, jl) ; } if (atomic_read(&(jl->j_nonzerolen)) > 0) { ret |= 1 ; } i = (i + 1) % JOURNAL_LIST_COUNT ; } return ret ; } /* ** removes any nodes in table with name block and dev as bh. ** only touchs the hnext and hprev pointers. */ void remove_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_list *jl,struct buffer_head *bh, int remove_freed){ struct reiserfs_journal_cnode *cur ; struct reiserfs_journal_cnode **head ; if (!bh) return ; head= &(journal_hash(table, bh->b_dev, bh->b_blocknr)) ; if (!head) { return ; } cur = *head ; while(cur) { if (cur->blocknr == bh->b_blocknr && cur->dev == bh->b_dev && (jl == NULL || jl == cur->jlist) && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { if (cur->hnext) { cur->hnext->hprev = cur->hprev ; } if (cur->hprev) { cur->hprev->hnext = cur->hnext ; } else { *head = cur->hnext ; } cur->blocknr = 0 ; cur->dev = 0 ; cur->state = 0 ; if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */ atomic_dec(&(cur->jlist->j_nonzerolen)) ; cur->bh = NULL ; cur->jlist = NULL ; } cur = cur->hnext ; } } static void free_journal_ram(struct super_block *p_s_sb) { vfree(SB_JOURNAL(p_s_sb)->j_cnode_free_orig) ; free_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap) ; free_bitmap_nodes(p_s_sb) ; /* must be after free_list_bitmaps */ if (SB_JOURNAL(p_s_sb)->j_header_bh) { brelse(SB_JOURNAL(p_s_sb)->j_header_bh) ; } /* j_header_bh is on the journal dev, make sure not to release the journal * dev until we brelse j_header_bh */ release_journal_dev(p_s_sb, SB_JOURNAL(p_s_sb)); vfree(SB_JOURNAL(p_s_sb)) ; } /* ** call on unmount. Only set error to 1 if you haven't made your way out ** of read_super() yet. Any other caller must keep error at 0. */ static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, int error) { struct reiserfs_transaction_handle myth ; /* we only want to flush out transactions if we were called with error == 0 */ if (!error && !(p_s_sb->s_flags & MS_RDONLY)) { /* end the current trans */ do_journal_end(th, p_s_sb,10, FLUSH_ALL) ; /* make sure something gets logged to force our way into the flush code */ journal_join(&myth, p_s_sb, 1) ; reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ; journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ; do_journal_end(&myth, p_s_sb,1, FLUSH_ALL) ; } /* we decrement before we wake up, because the commit thread dies off ** when it has been woken up and the count is <= 0 */ reiserfs_mounted_fs_count-- ; wake_up(&reiserfs_commit_thread_wait) ; sleep_on(&reiserfs_commit_thread_done) ; free_journal_ram(p_s_sb) ; return 0 ; } /* ** call on unmount. flush all journal trans, release all alloc'd ram */ int journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) { return do_journal_release(th, p_s_sb, 0) ; } /* ** only call from an error condition inside reiserfs_read_super! */ int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) { return do_journal_release(th, p_s_sb, 1) ; } /* compares description block with commit block. returns 1 if they differ, 0 if they are the same */ static int journal_compare_desc_commit(struct super_block *p_s_sb, struct reiserfs_journal_desc *desc, struct reiserfs_journal_commit *commit) { if (le32_to_cpu(commit->j_trans_id) != le32_to_cpu(desc->j_trans_id) || le32_to_cpu(commit->j_len) != le32_to_cpu(desc->j_len) || le32_to_cpu(commit->j_len) > SB_JOURNAL_TRANS_MAX(p_s_sb) || le32_to_cpu(commit->j_len) <= 0 ) { return 1 ; } return 0 ; } /* returns 0 if it did not find a description block ** returns -1 if it found a corrupt commit block ** returns 1 if both desc and commit were valid */ static int journal_transaction_is_valid(struct super_block *p_s_sb, struct buffer_head *d_bh, unsigned long *oldest_invalid_trans_id, unsigned long *newest_mount_id) { struct reiserfs_journal_desc *desc ; struct reiserfs_journal_commit *commit ; struct buffer_head *c_bh ; unsigned long offset ; if (!d_bh) return 0 ; desc = (struct reiserfs_journal_desc *)d_bh->b_data ; if (le32_to_cpu(desc->j_len) > 0 && !memcmp(desc->j_magic, JOURNAL_DESC_MAGIC, 8)) { if (oldest_invalid_trans_id && *oldest_invalid_trans_id && le32_to_cpu(desc->j_trans_id) > *oldest_invalid_trans_id) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-986: transaction " "is valid returning because trans_id %d is greater than " "oldest_invalid %lu\n", le32_to_cpu(desc->j_trans_id), *oldest_invalid_trans_id); return 0 ; } if (newest_mount_id && *newest_mount_id > le32_to_cpu(desc->j_mount_id)) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1087: transaction " "is valid returning because mount_id %d is less than " "newest_mount_id %lu\n", desc->j_mount_id, *newest_mount_id) ; return -1 ; } if ( le32_to_cpu(desc->j_len) > SB_JOURNAL_TRANS_MAX(p_s_sb) ) { reiserfs_warning(p_s_sb, "journal-2018: Bad transaction length %d encountered, ignoring transaction\n", le32_to_cpu(desc->j_len)); return -1 ; } offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ; /* ok, we have a journal description block, lets see if the transaction was valid */ c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((offset + le32_to_cpu(desc->j_len) + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ; if (!c_bh) return 0 ; commit = (struct reiserfs_journal_commit *)c_bh->b_data ; if (journal_compare_desc_commit(p_s_sb, desc, commit)) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_transaction_is_valid, commit offset %ld had bad " "time %d or length %d\n", c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), le32_to_cpu(commit->j_trans_id), le32_to_cpu(commit->j_len)); brelse(c_bh) ; if (oldest_invalid_trans_id) { *oldest_invalid_trans_id = le32_to_cpu(desc->j_trans_id) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1004: " "transaction_is_valid setting oldest invalid trans_id " "to %d\n", le32_to_cpu(desc->j_trans_id)) ; } return -1; } brelse(c_bh) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1006: found valid " "transaction start offset %lu, len %d id %d\n", d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_trans_id)) ; return 1 ; } else { return 0 ; } } static void brelse_array(struct buffer_head **heads, int num) { int i ; for (i = 0 ; i < num ; i++) { brelse(heads[i]) ; } } /* ** given the start, and values for the oldest acceptable transactions, ** this either reads in a replays a transaction, or returns because the transaction ** is invalid, or too old. */ static int journal_read_transaction(struct super_block *p_s_sb, unsigned long cur_dblock, unsigned long oldest_start, unsigned long oldest_trans_id, unsigned long newest_mount_id) { struct reiserfs_journal_desc *desc ; struct reiserfs_journal_commit *commit ; unsigned long trans_id = 0 ; struct buffer_head *c_bh ; struct buffer_head *d_bh ; struct buffer_head **log_blocks = NULL ; struct buffer_head **real_blocks = NULL ; unsigned long trans_offset ; int i; d_bh = journal_bread(p_s_sb, cur_dblock) ; if (!d_bh) return 1 ; desc = (struct reiserfs_journal_desc *)d_bh->b_data ; trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: " "journal_read_transaction, offset %lu, len %d mount_id %d\n", d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_mount_id)) ; if (le32_to_cpu(desc->j_trans_id) < oldest_trans_id) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: " "journal_read_trans skipping because %lu is too old\n", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ; brelse(d_bh) ; return 1 ; } if (le32_to_cpu(desc->j_mount_id) != newest_mount_id) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: " "journal_read_trans skipping because %d is != " "newest_mount_id %lu\n", le32_to_cpu(desc->j_mount_id), newest_mount_id) ; brelse(d_bh) ; return 1 ; } c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ; if (!c_bh) { brelse(d_bh) ; return 1 ; } commit = (struct reiserfs_journal_commit *)c_bh->b_data ; if (journal_compare_desc_commit(p_s_sb, desc, commit)) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_read_transaction, " "commit offset %ld had bad time %d or length %d\n", c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), le32_to_cpu(commit->j_trans_id), le32_to_cpu(commit->j_len)); brelse(c_bh) ; brelse(d_bh) ; return 1; } trans_id = le32_to_cpu(desc->j_trans_id) ; /* now we know we've got a good transaction, and it was inside the valid time ranges */ log_blocks = reiserfs_kmalloc(le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ; real_blocks = reiserfs_kmalloc(le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ; if (!log_blocks || !real_blocks) { brelse(c_bh) ; brelse(d_bh) ; reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_warning(p_s_sb, "journal-1169: kmalloc failed, unable to mount FS\n") ; return -1 ; } /* get all the buffer heads */ for(i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) { log_blocks[i] = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + (trans_offset + 1 + i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)); if (i < JOURNAL_TRANS_HALF) { real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(desc->j_realblock[i])) ; } else { real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(commit->j_realblock[i - JOURNAL_TRANS_HALF])) ; } if ( real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb) ) { reiserfs_warning(p_s_sb, "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem\n"); goto abort_replay; } /* make sure we don't try to replay onto log or reserved area */ if (is_block_in_log_or_reserved_area(p_s_sb, real_blocks[i]->b_blocknr)) { reiserfs_warning(p_s_sb, "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block\n") ; abort_replay: brelse_array(log_blocks, i) ; brelse_array(real_blocks, i) ; brelse(c_bh) ; brelse(d_bh) ; reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; return -1 ; } } /* read in the log blocks, memcpy to the corresponding real block */ ll_rw_block(READ, le32_to_cpu(desc->j_len), log_blocks) ; for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) { wait_on_buffer(log_blocks[i]) ; if (!buffer_uptodate(log_blocks[i])) { reiserfs_warning(p_s_sb, "journal-1212: REPLAY FAILURE fsck required! buffer write failed\n") ; brelse_array(log_blocks + i, le32_to_cpu(desc->j_len) - i) ; brelse_array(real_blocks, le32_to_cpu(desc->j_len)) ; brelse(c_bh) ; brelse(d_bh) ; reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; return -1 ; } memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size) ; mark_buffer_uptodate(real_blocks[i], 1) ; brelse(log_blocks[i]) ; } /* flush out the real blocks */ for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) { set_bit(BH_Dirty, &(real_blocks[i]->b_state)) ; ll_rw_block(WRITE, 1, real_blocks + i) ; } for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) { wait_on_buffer(real_blocks[i]) ; if (!buffer_uptodate(real_blocks[i])) { reiserfs_warning(p_s_sb, "journal-1226: REPLAY FAILURE, fsck required! buffer write failed\n") ; brelse_array(real_blocks + i, le32_to_cpu(desc->j_len) - i) ; brelse(c_bh) ; brelse(d_bh) ; reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; return -1 ; } brelse(real_blocks[i]) ; } cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal " "start to offset %ld\n", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ; /* init starting values for the first transaction, in case this is the last transaction to be replayed. */ SB_JOURNAL(p_s_sb)->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ; SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ; SB_JOURNAL(p_s_sb)->j_trans_id = trans_id + 1; brelse(c_bh) ; brelse(d_bh) ; reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ; return 0 ; } /* ** read and replay the log ** on a clean unmount, the journal header's next unflushed pointer will be to an invalid ** transaction. This tests that before finding all the transactions in the log, whic makes normal mount times fast. ** ** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid. ** ** On exit, it sets things up so the first transaction will work correctly. */ struct buffer_head * reiserfs_breada (kdev_t dev, int block, int bufsize, unsigned int max_block) { struct buffer_head * bhlist[BUFNR]; unsigned int blocks = BUFNR; struct buffer_head * bh; int i, j; bh = getblk (dev, block, bufsize); if (buffer_uptodate (bh)) return (bh); if (block + BUFNR > max_block) { blocks = max_block - block; } bhlist[0] = bh; j = 1; for (i = 1; i < blocks; i++) { bh = getblk (dev, block + i, bufsize); if (buffer_uptodate (bh)) { brelse (bh); break; } else bhlist[j++] = bh; } ll_rw_block (READ, j, bhlist); for(i = 1; i < j; i++) brelse (bhlist[i]); bh = bhlist[0]; wait_on_buffer (bh); if (buffer_uptodate (bh)) return bh; brelse (bh); return NULL; } static struct buffer_head * journal_breada (struct super_block *p_s_sb, int block) { return reiserfs_breada (SB_JOURNAL_DEV(p_s_sb), block, p_s_sb->s_blocksize, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb)); } static int journal_read(struct super_block *p_s_sb) { struct reiserfs_journal_desc *desc ; unsigned long oldest_trans_id = 0; unsigned long oldest_invalid_trans_id = 0 ; time_t start ; unsigned long oldest_start = 0; unsigned long cur_dblock = 0 ; unsigned long newest_mount_id = 9 ; struct buffer_head *d_bh ; struct reiserfs_journal_header *jh ; int valid_journal_header = 0 ; int replay_count = 0 ; int continue_replay = 1 ; int ret ; cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ; printk("reiserfs: checking transaction log (device %s) ...\n", bdevname(SB_JOURNAL_DEV(p_s_sb))) ; printk("for (%s)\n", bdevname(p_s_sb->s_dev)) ; start = CURRENT_TIME ; /* step 1, read in the journal header block. Check the transaction it says ** is the first unflushed, and if that transaction is not valid, ** replay is done */ SB_JOURNAL(p_s_sb)->j_header_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ; if (!SB_JOURNAL(p_s_sb)->j_header_bh) { return 1 ; } jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ; if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 && le32_to_cpu(jh->j_first_unflushed_offset) < SB_ONDISK_JOURNAL_SIZE(p_s_sb) && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { oldest_start = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + le32_to_cpu(jh->j_first_unflushed_offset) ; oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; newest_mount_id = le32_to_cpu(jh->j_mount_id); reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1153: found in " "header: first_unflushed_offset %d, last_flushed_trans_id " "%lu\n", le32_to_cpu(jh->j_first_unflushed_offset), le32_to_cpu(jh->j_last_flush_trans_id)) ; valid_journal_header = 1 ; /* now, we try to read the first unflushed offset. If it is not valid, ** there is nothing more we can do, and it makes no sense to read ** through the whole log. */ d_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + le32_to_cpu(jh->j_first_unflushed_offset)) ; ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL) ; if (!ret) { continue_replay = 0 ; } brelse(d_bh) ; goto start_log_replay; } if (continue_replay && is_read_only(p_s_sb->s_dev)) { reiserfs_warning(p_s_sb, "clm-2076: device is readonly, unable to replay log\n") ; return -1 ; } if (continue_replay && (p_s_sb->s_flags & MS_RDONLY)) { printk("Warning, log replay starting on readonly filesystem\n") ; } /* ok, there are transactions that need to be replayed. start with the first log block, find ** all the valid transactions, and pick out the oldest. */ while(continue_replay && cur_dblock < (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb))) { d_bh = journal_breada(p_s_sb, cur_dblock) ; ret = journal_transaction_is_valid(p_s_sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id) ; if (ret == 1) { desc = (struct reiserfs_journal_desc *)d_bh->b_data ; if (oldest_start == 0) { /* init all oldest_ values */ oldest_trans_id = le32_to_cpu(desc->j_trans_id) ; oldest_start = d_bh->b_blocknr ; newest_mount_id = le32_to_cpu(desc->j_mount_id) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1179: Setting " "oldest_start to offset %lu, trans_id %lu\n", oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), oldest_trans_id) ; } else if (oldest_trans_id > le32_to_cpu(desc->j_trans_id)) { /* one we just read was older */ oldest_trans_id = le32_to_cpu(desc->j_trans_id) ; oldest_start = d_bh->b_blocknr ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting " "oldest_start to offset %lu, trans_id %lu\n", oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), oldest_trans_id) ; } if (newest_mount_id < le32_to_cpu(desc->j_mount_id)) { newest_mount_id = le32_to_cpu(desc->j_mount_id) ; reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " "newest_mount_id to %d\n", le32_to_cpu(desc->j_mount_id)); } cur_dblock += le32_to_cpu(desc->j_len) + 2 ; } else { cur_dblock++ ; } brelse(d_bh) ; } start_log_replay: cur_dblock = oldest_start ; if (oldest_trans_id) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay " "from offset %lu, trans_id %lu\n", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb), oldest_trans_id) ; } replay_count = 0 ; while(continue_replay && oldest_trans_id > 0) { ret = journal_read_transaction(p_s_sb, cur_dblock, oldest_start, oldest_trans_id, newest_mount_id) ; if (ret < 0) { return ret ; } else if (ret != 0) { break ; } cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start ; replay_count++ ; if (cur_dblock == oldest_start) break; } if (oldest_trans_id == 0) { reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1225: No valid " "transactions found\n") ; } /* j_start does not get set correctly if we don't replay any transactions. ** if we had a valid journal_header, set j_start to the first unflushed transaction value, ** copy the trans_id from the header */ if (valid_journal_header && replay_count == 0) { SB_JOURNAL(p_s_sb)->j_start = le32_to_cpu(jh->j_first_unflushed_offset) ; SB_JOURNAL(p_s_sb)->j_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ; SB_JOURNAL(p_s_sb)->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; } else { SB_JOURNAL(p_s_sb)->j_mount_id = newest_mount_id + 1 ; } reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " "newest_mount_id to %lu\n", SB_JOURNAL(p_s_sb)->j_mount_id) ; SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = SB_JOURNAL(p_s_sb)->j_start ; if (replay_count > 0) { printk("reiserfs: replayed %d transactions in %lu seconds\n", replay_count, CURRENT_TIME - start) ; } if (!is_read_only(p_s_sb->s_dev) && _update_journal_header_block(p_s_sb, SB_JOURNAL(p_s_sb)->j_start, SB_JOURNAL(p_s_sb)->j_last_flush_trans_id)) { /* replay failed, caller must call free_journal_ram and abort ** the mount */ return -1 ; } return 0 ; } struct reiserfs_journal_commit_task { struct super_block *p_s_sb ; int jindex ; int wake_on_finish ; /* if this is one, we wake the task_done queue, if it ** is zero, we free the whole struct on finish */ struct reiserfs_journal_commit_task *self ; struct wait_queue *task_done ; struct tq_struct task ; } ; static void reiserfs_journal_commit_task_func(struct reiserfs_journal_commit_task *ct) { struct reiserfs_journal_list *jl ; jl = SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex ; flush_commit_list(ct->p_s_sb, SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex, 1) ; if (jl->j_len > 0 && atomic_read(&(jl->j_nonzerolen)) > 0 && atomic_read(&(jl->j_commit_left)) == 0) { kupdate_one_transaction(ct->p_s_sb, jl) ; } reiserfs_kfree(ct->self, sizeof(struct reiserfs_journal_commit_task), ct->p_s_sb) ; } static void setup_commit_task_arg(struct reiserfs_journal_commit_task *ct, struct super_block *p_s_sb, int jindex) { if (!ct) { reiserfs_panic(NULL, "journal-1360: setup_commit_task_arg called with NULL struct\n") ; } ct->p_s_sb = p_s_sb ; ct->jindex = jindex ; ct->task_done = NULL ; INIT_LIST_HEAD(&ct->task.list) ; ct->task.sync = 0 ; ct->task.routine = (void *)(void *)reiserfs_journal_commit_task_func ; ct->self = ct ; ct->task.data = (void *)ct ; } static void commit_flush_async(struct super_block *p_s_sb, int jindex) { struct reiserfs_journal_commit_task *ct ; /* using GFP_NOFS, GFP_KERNEL could try to flush inodes, which will try ** to start/join a transaction, which will deadlock */ ct = reiserfs_kmalloc(sizeof(struct reiserfs_journal_commit_task), GFP_NOFS, p_s_sb) ; if (ct) { setup_commit_task_arg(ct, p_s_sb, jindex) ; queue_task(&(ct->task), &reiserfs_commit_thread_tq); wake_up(&reiserfs_commit_thread_wait) ; } else { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(p_s_sb, "journal-1540: kmalloc failed, doing sync commit\n") ; #endif flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ; } } /* ** this is the commit thread. It is started with kernel_thread on ** FS mount, and journal_release() waits for it to exit. ** ** It could do a periodic commit, but there is a lot code for that ** elsewhere right now, and I only wanted to implement this little ** piece for starters. ** ** All we do here is sleep on the j_commit_thread_wait wait queue, and ** then run the per filesystem commit task queue when we wakeup. */ static int reiserfs_journal_commit_thread(void *nullp) { daemonize() ; spin_lock_irq(¤t->sigmask_lock); sigfillset(¤t->blocked); recalc_sigpending(current); spin_unlock_irq(¤t->sigmask_lock); sprintf(current->comm, "kreiserfsd") ; lock_kernel() ; while(1) { while(TQ_ACTIVE(reiserfs_commit_thread_tq)) { run_task_queue(&reiserfs_commit_thread_tq) ; } /* if there aren't any more filesystems left, break */ if (reiserfs_mounted_fs_count <= 0) { run_task_queue(&reiserfs_commit_thread_tq) ; break ; } wake_up(&reiserfs_commit_thread_done) ; interruptible_sleep_on_timeout(&reiserfs_commit_thread_wait, 5 * HZ) ; } unlock_kernel() ; wake_up(&reiserfs_commit_thread_done) ; return 0 ; } static void journal_list_init(struct super_block *p_s_sb) { int i ; for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) { init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_commit_wait)) ; init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_flush_wait)) ; } } static int release_journal_dev( struct super_block *super, struct reiserfs_journal *journal ) { int result; result = 0; if( journal -> j_dev_bd != NULL && journal->j_dev_bd != super->s_bdev) { result = blkdev_put( journal -> j_dev_bd, BDEV_FS ); journal -> j_dev_bd = NULL; } if( journal -> j_dev_file != NULL ) { result = filp_close( journal -> j_dev_file, NULL ); journal -> j_dev_file = NULL; } if( result != 0 ) { reiserfs_warning(super, "release_journal_dev: Cannot release journal device: %i", result ); } return result; } static int journal_init_dev( struct super_block *super, struct reiserfs_journal *journal, const char *jdev_name ) { int result; kdev_t jdev; int blkdev_mode = FMODE_READ | FMODE_WRITE; result = 0; journal -> j_dev_bd = NULL; journal -> j_dev_file = NULL; jdev = SB_JOURNAL_DEV( super ) = SB_ONDISK_JOURNAL_DEVICE( super ) ? to_kdev_t(SB_ONDISK_JOURNAL_DEVICE( super )) : super -> s_dev; /* there is no "jdev" option */ if (is_read_only(super->s_dev)) blkdev_mode = FMODE_READ; if( ( !jdev_name || !jdev_name[ 0 ] ) ) { /* don't add an extra reference to the device when * the log is on the same disk as the FS. It makes the * raid code unhappy */ if (jdev == super->s_dev) { journal->j_dev_bd = super->s_bdev; return 0; } journal -> j_dev_bd = bdget( kdev_t_to_nr( jdev ) ); if( journal -> j_dev_bd ) { result = blkdev_get( journal -> j_dev_bd, blkdev_mode, 0, BDEV_FS ); if (result) { bdput(journal->j_dev_bd); journal->j_dev_bd = NULL; } } else { result = -ENOMEM; } if( result != 0 ) printk( "journal_init_dev: cannot init journal device\n '%s': %i", kdevname( jdev ), result ); return result; } /* "jdev" option has been found */ journal -> j_dev_file = filp_open( jdev_name, 0, 0 ); if( !IS_ERR( journal -> j_dev_file ) ) { struct inode *jdev_inode; jdev_inode = journal -> j_dev_file -> f_dentry -> d_inode; journal -> j_dev_bd = jdev_inode -> i_bdev; if( !S_ISBLK( jdev_inode -> i_mode ) ) { printk( "journal_init_dev: '%s' is not a block device", jdev_name ); result = -ENOTBLK; } else if( journal -> j_dev_file -> f_vfsmnt -> mnt_flags & MNT_NODEV) { printk( "journal_init_dev: Cannot use devices on '%s'", jdev_name ); result = -EACCES; } else if( jdev_inode -> i_bdev == NULL ) { printk( "journal_init_dev: bdev unintialized for '%s'", jdev_name ); result = -ENOMEM; } else if( ( result = blkdev_get( jdev_inode -> i_bdev, blkdev_mode, 0, BDEV_FS ) ) != 0 ) { journal -> j_dev_bd = NULL; printk( "journal_init_dev: Cannot load device '%s': %i", jdev_name, result ); } else /* ok */ SB_JOURNAL_DEV( super ) = to_kdev_t( jdev_inode -> i_bdev -> bd_dev ); } else { result = PTR_ERR( journal -> j_dev_file ); journal -> j_dev_file = NULL; printk( "journal_init_dev: Cannot open '%s': %i", jdev_name, result ); } if( result != 0 ) { release_journal_dev( super, journal ); } printk( "journal_init_dev: journal device: %s", kdevname( SB_JOURNAL_DEV( super ) ) ); return result; } /* ** must be called once on fs mount. calls journal_read for you */ int journal_init(struct super_block *p_s_sb, const char * j_dev_name, int old_format) { int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2 ; struct buffer_head *bhjh; struct reiserfs_super_block * rs; struct reiserfs_journal_header *jh; struct reiserfs_journal *journal; if (sizeof(struct reiserfs_journal_commit) != 4096 || sizeof(struct reiserfs_journal_desc) != 4096) { reiserfs_warning(p_s_sb, "journal-1249: commit or desc struct not 4096 %Zd %Zd\n", sizeof(struct reiserfs_journal_commit), sizeof(struct reiserfs_journal_desc)) ; return 1 ; } if ( SB_ONDISK_JOURNAL_SIZE(p_s_sb) < 512 ) { reiserfs_warning(p_s_sb, "Journal size %d is less than 512+1 blocks, which unsupported\n", SB_ONDISK_JOURNAL_SIZE(p_s_sb)); return 1 ; } journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof (struct reiserfs_journal)) ; if (!journal) { reiserfs_warning(p_s_sb, "journal-1256: unable to get memory for journal structure\n") ; return 1 ; } memset(journal, 0, sizeof(struct reiserfs_journal)) ; INIT_LIST_HEAD(&SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ; INIT_LIST_HEAD (&SB_JOURNAL(p_s_sb)->j_prealloc_list); reiserfs_allocate_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap, SB_BMAP_NR(p_s_sb)) ; allocate_bitmap_nodes(p_s_sb) ; /* reserved for journal area support */ SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ? REISERFS_OLD_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize + SB_BMAP_NR(p_s_sb) + 1 : REISERFS_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize + 2); if( journal_init_dev( p_s_sb, journal, j_dev_name ) != 0 ) { reiserfs_warning(p_s_sb, "journal-1259: unable to initialize jornal device\n"); goto free_and_return; } rs = SB_DISK_SUPER_BLOCK(p_s_sb); /* read journal header */ bhjh = journal_bread (p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb)); if (!bhjh) { reiserfs_warning(p_s_sb, "journal-459: unable to read journal header\n") ; goto free_and_return; } jh = (struct reiserfs_journal_header *)(bhjh->b_data); /* make sure that journal matches to the super block */ if (is_reiserfs_jr(rs) && jh->jh_journal.jp_journal_magic != sb_jp_journal_magic(rs)) { char jname[ 32 ]; char fname[ 32 ]; strcpy( jname, kdevname( SB_JOURNAL_DEV(p_s_sb) ) ); strcpy( fname, kdevname( p_s_sb->s_dev ) ); printk("journal-460: journal header magic %x (device %s) does not " "match magic found in super block %x (device %s)\n", jh->jh_journal.jp_journal_magic, jname, sb_jp_journal_magic(rs), fname); brelse (bhjh); goto free_and_return; } SB_JOURNAL_TRANS_MAX(p_s_sb) = le32_to_cpu (jh->jh_journal.jp_journal_trans_max); SB_JOURNAL_MAX_BATCH(p_s_sb) = le32_to_cpu (jh->jh_journal.jp_journal_max_batch); SB_JOURNAL_MAX_COMMIT_AGE(p_s_sb) = le32_to_cpu (jh->jh_journal.jp_journal_max_commit_age); SB_JOURNAL_MAX_TRANS_AGE(p_s_sb) = JOURNAL_MAX_TRANS_AGE; if (SB_JOURNAL_TRANS_MAX(p_s_sb)) { /* make sure these parameters are available, assign if they are not */ __u32 initial = SB_JOURNAL_TRANS_MAX(p_s_sb); __u32 ratio = 1; if (p_s_sb->s_blocksize < 4096) ratio = 4096 / p_s_sb->s_blocksize; if (SB_ONDISK_JOURNAL_SIZE(p_s_sb)/SB_JOURNAL_TRANS_MAX(p_s_sb) < JOURNAL_MIN_RATIO) { SB_JOURNAL_TRANS_MAX(p_s_sb) = SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO; } if (SB_JOURNAL_TRANS_MAX(p_s_sb) > JOURNAL_TRANS_MAX_DEFAULT / ratio) SB_JOURNAL_TRANS_MAX(p_s_sb) = JOURNAL_TRANS_MAX_DEFAULT / ratio; if (SB_JOURNAL_TRANS_MAX(p_s_sb) < JOURNAL_TRANS_MIN_DEFAULT / ratio) SB_JOURNAL_TRANS_MAX(p_s_sb) = JOURNAL_TRANS_MIN_DEFAULT / ratio; if (SB_JOURNAL_TRANS_MAX(p_s_sb) != initial) { printk ("reiserfs warning: wrong transaction max size (%u). " "Changed to %u\n", initial, SB_JOURNAL_TRANS_MAX(p_s_sb)); } SB_JOURNAL_MAX_BATCH(p_s_sb) = SB_JOURNAL_TRANS_MAX(p_s_sb) * JOURNAL_MAX_BATCH_DEFAULT / JOURNAL_TRANS_MAX_DEFAULT; } if (!SB_JOURNAL_TRANS_MAX(p_s_sb)) { /*we have the file system was created by old version of mkreiserfs so this field contains zero value */ SB_JOURNAL_TRANS_MAX(p_s_sb) = JOURNAL_TRANS_MAX_DEFAULT ; SB_JOURNAL_MAX_BATCH(p_s_sb) = JOURNAL_MAX_BATCH_DEFAULT ; SB_JOURNAL_MAX_COMMIT_AGE(p_s_sb) = JOURNAL_MAX_COMMIT_AGE ; /* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096 trans max size is decreased proportionally */ if (p_s_sb->s_blocksize < 4096) { SB_JOURNAL_TRANS_MAX(p_s_sb) /= (4096 / p_s_sb->s_blocksize) ; SB_JOURNAL_MAX_BATCH(p_s_sb) = SB_JOURNAL_TRANS_MAX(p_s_sb)*9 / 10; } } brelse (bhjh); SB_JOURNAL(p_s_sb)->j_list_bitmap_index = 0 ; SB_JOURNAL_LIST_INDEX(p_s_sb) = -10000 ; /* make sure flush_old_commits does not try to flush a list while replay is on */ /* clear out the journal list array */ memset(SB_JOURNAL_LIST(p_s_sb), 0, sizeof(struct reiserfs_journal_list) * JOURNAL_LIST_COUNT) ; journal_list_init(p_s_sb) ; memset(SB_JOURNAL(p_s_sb)->j_list_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ; memset(journal_writers, 0, sizeof(char *) * 512) ; /* debug code */ INIT_LIST_HEAD(&(SB_JOURNAL(p_s_sb)->j_dirty_buffers)) ; SB_JOURNAL(p_s_sb)->j_start = 0 ; SB_JOURNAL(p_s_sb)->j_len = 0 ; SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ; SB_JOURNAL(p_s_sb)->j_bcount = 0 ; SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ; SB_JOURNAL(p_s_sb)->j_last = NULL ; SB_JOURNAL(p_s_sb)->j_first = NULL ; init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_wait)) ; SB_JOURNAL(p_s_sb)->j_trans_id = 10 ; SB_JOURNAL(p_s_sb)->j_mount_id = 10 ; SB_JOURNAL(p_s_sb)->j_state = 0 ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 0) ; SB_JOURNAL(p_s_sb)->j_cnode_free_list = allocate_cnodes(num_cnodes) ; SB_JOURNAL(p_s_sb)->j_cnode_free_orig = SB_JOURNAL(p_s_sb)->j_cnode_free_list ; SB_JOURNAL(p_s_sb)->j_cnode_free = SB_JOURNAL(p_s_sb)->j_cnode_free_list ? num_cnodes : 0 ; SB_JOURNAL(p_s_sb)->j_cnode_used = 0 ; SB_JOURNAL(p_s_sb)->j_must_wait = 0 ; init_journal_hash(p_s_sb) ; SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb)) ; if (!(SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap)) { reiserfs_warning(p_s_sb, "journal-2005, get_list_bitmap failed for journal list 0\n") ; goto free_and_return; } if (journal_read(p_s_sb) < 0) { reiserfs_warning(p_s_sb, "Replay Failure, unable to mount\n") ; goto free_and_return; } /* once the read is done, we can set this where it belongs */ SB_JOURNAL_LIST_INDEX(p_s_sb) = 0 ; if (reiserfs_dont_log (p_s_sb)) return 0; reiserfs_mounted_fs_count++ ; if (reiserfs_mounted_fs_count <= 1) { kernel_thread((void *)(void *)reiserfs_journal_commit_thread, NULL, CLONE_FS | CLONE_FILES | CLONE_VM) ; } return 0 ; free_and_return: free_journal_ram(p_s_sb); return 1; } /* ** test for a polite end of the current transaction. Used by file_write, and should ** be used by delete to make sure they don't write more than can fit inside a single ** transaction */ int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) { time_t now = CURRENT_TIME ; if (reiserfs_dont_log(th->t_super)) return 0 ; if ( SB_JOURNAL(th->t_super)->j_must_wait > 0 || (SB_JOURNAL(th->t_super)->j_len_alloc + new_alloc) >= SB_JOURNAL_MAX_BATCH(th->t_super) || atomic_read(&(SB_JOURNAL(th->t_super)->j_jlock)) || (now - SB_JOURNAL(th->t_super)->j_trans_start_time) > SB_JOURNAL_MAX_TRANS_AGE(th->t_super) || SB_JOURNAL(th->t_super)->j_cnode_free < (SB_JOURNAL_TRANS_MAX(th->t_super) * 3)) { return 1 ; } return 0 ; } /* this must be called inside a transaction, and requires the ** kernel_lock to be held */ void reiserfs_block_writes(struct reiserfs_transaction_handle *th) { struct super_block *s = th->t_super ; SB_JOURNAL(s)->j_must_wait = 1 ; set_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ; return ; } /* this must be called without a transaction started, and does not ** require BKL */ void reiserfs_allow_writes(struct super_block *s) { clear_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ; wake_up(&SB_JOURNAL(s)->j_join_wait) ; } /* this must be called without a transaction started, and does not ** require BKL */ void reiserfs_wait_on_write_block(struct super_block *s) { wait_event(SB_JOURNAL(s)->j_join_wait, !test_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state)) ; } /* join == true if you must join an existing transaction. ** join == false if you can deal with waiting for others to finish ** ** this will block until the transaction is joinable. send the number of blocks you ** expect to use in nblocks. */ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb,unsigned long nblocks,int join) { time_t now = CURRENT_TIME ; int old_trans_id ; reiserfs_check_lock_depth("journal_begin") ; RFALSE( p_s_sb->s_flags & MS_RDONLY, "clm-2078: calling journal_begin on readonly FS") ; if (reiserfs_dont_log(p_s_sb)) { th->t_super = p_s_sb ; /* others will check this for the don't log flag */ return 0 ; } PROC_INFO_INC( p_s_sb, journal.journal_being ); relock: lock_journal(p_s_sb) ; if (test_bit(WRITERS_BLOCKED, &SB_JOURNAL(p_s_sb)->j_state)) { unlock_journal(p_s_sb) ; reiserfs_wait_on_write_block(p_s_sb) ; PROC_INFO_INC( p_s_sb, journal.journal_relock_writers ); goto relock ; } /* if there is no room in the journal OR ** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning ** we don't sleep if there aren't other writers */ if ( (!join && SB_JOURNAL(p_s_sb)->j_must_wait > 0) || ( !join && (SB_JOURNAL(p_s_sb)->j_len_alloc + nblocks + 2) >= SB_JOURNAL_MAX_BATCH(p_s_sb)) || (!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0 && SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 && (now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > SB_JOURNAL_MAX_TRANS_AGE(p_s_sb)) || (!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) ) || (!join && SB_JOURNAL(p_s_sb)->j_cnode_free < (SB_JOURNAL_TRANS_MAX(p_s_sb) * 3))) { unlock_journal(p_s_sb) ; /* allow others to finish this transaction */ /* if writer count is 0, we can just force this transaction to end, and start ** a new one afterwards. */ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) { struct reiserfs_transaction_handle myth ; journal_join(&myth, p_s_sb, 1) ; reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ; journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ; do_journal_end(&myth, p_s_sb,1,COMMIT_NOW) ; } else { /* but if the writer count isn't zero, we have to wait for the current writers to finish. ** They won't batch on transaction end once we set j_jlock */ atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ; old_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ; while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) && SB_JOURNAL(p_s_sb)->j_trans_id == old_trans_id) { sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; } } PROC_INFO_INC( p_s_sb, journal.journal_relock_wcount ); goto relock ; } if (SB_JOURNAL(p_s_sb)->j_trans_start_time == 0) { /* we are the first writer, set trans_id */ SB_JOURNAL(p_s_sb)->j_trans_start_time = now ; } atomic_inc(&(SB_JOURNAL(p_s_sb)->j_wcount)) ; SB_JOURNAL(p_s_sb)->j_len_alloc += nblocks ; th->t_blocks_logged = 0 ; th->t_blocks_allocated = nblocks ; th->t_super = p_s_sb ; th->t_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ; th->t_caller = "Unknown" ; unlock_journal(p_s_sb) ; p_s_sb->s_dirt = 1; return 0 ; } static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) { return do_journal_begin_r(th, p_s_sb, nblocks, 1) ; } int journal_begin(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks) { return do_journal_begin_r(th, p_s_sb, nblocks, 0) ; } /* not used at all */ int journal_prepare(struct super_block * p_s_sb, struct buffer_head *bh) { return 0 ; } /* ** puts bh into the current transaction. If it was already there, reorders removes the ** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order). ** ** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the ** transaction is committed. ** ** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. */ int journal_mark_dirty(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) { struct reiserfs_journal_cnode *cn = NULL; int count_already_incd = 0 ; int prepared = 0 ; PROC_INFO_INC( p_s_sb, journal.mark_dirty ); if (reiserfs_dont_log(th->t_super)) { mark_buffer_dirty(bh) ; return 0 ; } if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) { reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n", th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id); } p_s_sb->s_dirt = 1 ; prepared = test_and_clear_bit(BH_JPrepared, &bh->b_state) ; /* already in this transaction, we are done */ if (buffer_journaled(bh)) { PROC_INFO_INC( p_s_sb, journal.mark_dirty_already ); return 0 ; } /* this must be turned into a panic instead of a warning. We can't allow ** a dirty or journal_dirty or locked buffer to be logged, as some changes ** could get to disk too early. NOT GOOD. */ if (!prepared || buffer_locked(bh)) { reiserfs_warning(p_s_sb, "journal-1777: buffer %lu bad state %cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT\n", bh->b_blocknr, prepared ? ' ' : '!', buffer_locked(bh) ? ' ' : '!', buffer_dirty(bh) ? ' ' : '!', buffer_journal_dirty(bh) ? ' ' : '!') ; show_reiserfs_locks() ; } count_already_incd = clear_prepared_bits(bh) ; if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) { reiserfs_warning(p_s_sb, "journal-1409: journal_mark_dirty returning because j_wcount was %d\n", atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount))) ; return 1 ; } /* this error means I've screwed up, and we've overflowed the transaction. ** Nothing can be done here, except make the FS readonly or panic. */ if (SB_JOURNAL(p_s_sb)->j_len >= SB_JOURNAL_TRANS_MAX(p_s_sb)) { reiserfs_panic(th->t_super, "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n", SB_JOURNAL(p_s_sb)->j_len) ; } if (buffer_journal_dirty(bh)) { count_already_incd = 1 ; PROC_INFO_INC( p_s_sb, journal.mark_dirty_notjournal ); mark_buffer_notjournal_dirty(bh) ; } if (buffer_dirty(bh)) { clear_bit(BH_Dirty, &bh->b_state) ; } if (buffer_journaled(bh)) { /* must double check after getting lock */ goto done ; } if (SB_JOURNAL(p_s_sb)->j_len > SB_JOURNAL(p_s_sb)->j_len_alloc) { SB_JOURNAL(p_s_sb)->j_len_alloc = SB_JOURNAL(p_s_sb)->j_len + JOURNAL_PER_BALANCE_CNT ; } set_bit(BH_JDirty, &bh->b_state) ; /* now put this guy on the end */ if (!cn) { cn = get_cnode(p_s_sb) ; if (!cn) { reiserfs_panic(p_s_sb, "get_cnode failed!\n"); } if (th->t_blocks_logged == th->t_blocks_allocated) { th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT ; SB_JOURNAL(p_s_sb)->j_len_alloc += JOURNAL_PER_BALANCE_CNT ; } th->t_blocks_logged++ ; SB_JOURNAL(p_s_sb)->j_len++ ; cn->bh = bh ; cn->blocknr = bh->b_blocknr ; cn->dev = bh->b_dev ; cn->jlist = NULL ; insert_journal_hash(SB_JOURNAL(p_s_sb)->j_hash_table, cn) ; if (!count_already_incd) { get_bh(bh) ; } } cn->next = NULL ; cn->prev = SB_JOURNAL(p_s_sb)->j_last ; cn->bh = bh ; if (SB_JOURNAL(p_s_sb)->j_last) { SB_JOURNAL(p_s_sb)->j_last->next = cn ; SB_JOURNAL(p_s_sb)->j_last = cn ; } else { SB_JOURNAL(p_s_sb)->j_first = cn ; SB_JOURNAL(p_s_sb)->j_last = cn ; } done: return 0 ; } /* ** if buffer already in current transaction, do a journal_mark_dirty ** otherwise, just mark it dirty and move on. Used for writes to meta blocks ** that don't need journaling */ int journal_mark_dirty_nolog(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) { if (reiserfs_dont_log(th->t_super) || buffer_journaled(bh) || buffer_journal_dirty(bh)) { return journal_mark_dirty(th, p_s_sb, bh) ; } if (get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, bh->b_dev,bh->b_blocknr,bh->b_size)) { return journal_mark_dirty(th, p_s_sb, bh) ; } mark_buffer_dirty(bh) ; return 0 ; } int journal_end(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) { return do_journal_end(th, p_s_sb, nblocks, 0) ; } /* removes from the current transaction, relsing and descrementing any counters. ** also files the removed buffer directly onto the clean list ** ** called by journal_mark_freed when a block has been deleted ** ** returns 1 if it cleaned and relsed the buffer. 0 otherwise */ static int remove_from_transaction(struct super_block *p_s_sb, unsigned long blocknr, int already_cleaned) { struct buffer_head *bh ; struct reiserfs_journal_cnode *cn ; int ret = 0; cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_hash_table, p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ; if (!cn || !cn->bh) { return ret ; } bh = cn->bh ; if (cn->prev) { cn->prev->next = cn->next ; } if (cn->next) { cn->next->prev = cn->prev ; } if (cn == SB_JOURNAL(p_s_sb)->j_first) { SB_JOURNAL(p_s_sb)->j_first = cn->next ; } if (cn == SB_JOURNAL(p_s_sb)->j_last) { SB_JOURNAL(p_s_sb)->j_last = cn->prev ; } remove_journal_hash(SB_JOURNAL(p_s_sb)->j_hash_table, NULL, bh, 0) ; mark_buffer_not_journaled(bh) ; /* don't log this one */ if (!already_cleaned) { mark_buffer_notjournal_dirty(bh) ; put_bh(bh) ; if (atomic_read(&(bh->b_count)) < 0) { reiserfs_warning(p_s_sb, "journal-1752: remove from trans, b_count < 0\n") ; } if (!buffer_locked(bh)) reiserfs_clean_and_file_buffer(bh) ; ret = 1 ; } SB_JOURNAL(p_s_sb)->j_len-- ; SB_JOURNAL(p_s_sb)->j_len_alloc-- ; free_cnode(p_s_sb, cn) ; return ret ; } /* removes from a specific journal list hash */ static int remove_from_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, struct buffer_head *bh, int remove_freed) { remove_journal_hash(SB_JOURNAL(s)->j_list_hash_table, jl, bh, remove_freed) ; return 0 ; } /* ** for any cnode in a journal list, it can only be dirtied of all the ** transactions that include it are commited to disk. ** this checks through each transaction, and returns 1 if you are allowed to dirty, ** and 0 if you aren't ** ** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log ** blocks for a given transaction on disk ** */ static int can_dirty(struct reiserfs_journal_cnode *cn) { kdev_t dev = cn->dev ; unsigned long blocknr = cn->blocknr ; struct reiserfs_journal_cnode *cur = cn->hprev ; int can_dirty = 1 ; /* first test hprev. These are all newer than cn, so any node here ** with the name block number and dev means this node can't be sent ** to disk right now. */ while(cur && can_dirty) { if (cur->jlist && cur->bh && cur->blocknr && cur->dev == dev && cur->blocknr == blocknr) { can_dirty = 0 ; } cur = cur->hprev ; } /* then test hnext. These are all older than cn. As long as they ** are committed to the log, it is safe to write cn to disk */ cur = cn->hnext ; while(cur && can_dirty) { if (cur->jlist && cur->jlist->j_len > 0 && atomic_read(&(cur->jlist->j_commit_left)) > 0 && cur->bh && cur->blocknr && cur->dev == dev && cur->blocknr == blocknr) { can_dirty = 0 ; } cur = cur->hnext ; } return can_dirty ; } /* syncs the commit blocks, but does not force the real buffers to disk ** will wait until the current transaction is done/commited before returning */ int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) { if (SB_JOURNAL(p_s_sb)->j_len == 0) { reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ; journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ; } return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT) ; } int show_reiserfs_locks(void) { dump_journal_writers() ; return 0 ; } /* ** used to get memory back from async commits that are floating around ** and to reclaim any blocks deleted but unusable because their commits ** haven't hit disk yet. called from bitmap.c ** ** if it starts flushing things, it ors SCHEDULE_OCCURRED into repeat. ** note, this is just if schedule has a chance of occuring. I need to ** change flush_commit_lists to have a repeat parameter too. ** */ void flush_async_commits(struct super_block *p_s_sb) { int i ; for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) { if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) { flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ; } } } /* ** flushes any old transactions to disk ** ends the current transaction if it is too old ** ** also calls flush_journal_list with old_only == 1, which allows me to reclaim ** memory and such from the journal lists whose real blocks are all on disk. ** ** called by sync_dev_journal from buffer.c */ int flush_old_commits(struct super_block *p_s_sb, int immediate) { int i ; int count = 0; int start ; time_t now ; struct reiserfs_transaction_handle th ; start = SB_JOURNAL_LIST_INDEX(p_s_sb) ; now = CURRENT_TIME ; /* safety check so we don't flush while we are replaying the log during mount */ if (SB_JOURNAL_LIST_INDEX(p_s_sb) < 0) { return 0 ; } /* starting with oldest, loop until we get to the start */ i = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ; while(i != start) { if (SB_JOURNAL_LIST(p_s_sb)[i].j_len > 0 && ((now - SB_JOURNAL_LIST(p_s_sb)[i].j_timestamp) > SB_JOURNAL_MAX_COMMIT_AGE(p_s_sb) || immediate)) { /* we have to check again to be sure the current transaction did not change */ if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) { flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ; } } i = (i + 1) % JOURNAL_LIST_COUNT ; count++ ; } /* now, check the current transaction. If there are no writers, and it is too old, finish it, and ** force the commit blocks to disk */ if (!immediate && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0 && SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 && SB_JOURNAL(p_s_sb)->j_len > 0 && (now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > SB_JOURNAL_MAX_TRANS_AGE(p_s_sb)) { journal_join(&th, p_s_sb, 1) ; reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ; journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ; do_journal_end(&th, p_s_sb,1, COMMIT_NOW) ; } else if (immediate) { /* belongs above, but I wanted this to be very explicit as a special case. If they say to flush, we must be sure old transactions hit the disk too. */ journal_join(&th, p_s_sb, 1) ; reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ; journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ; do_journal_end(&th, p_s_sb,1, COMMIT_NOW | WAIT) ; } reiserfs_journal_kupdate(p_s_sb) ; return 0 ; } /* ** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit ** ** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all ** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just ** flushes the commit list and returns 0. ** ** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait. ** ** Note, we can't allow the journal_end to proceed while there are still writers in the log. */ static int check_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks, int flags) { time_t now ; int flush = flags & FLUSH_ALL ; int commit_now = flags & COMMIT_NOW ; int wait_on_commit = flags & WAIT ; if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) { reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n", th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id); } SB_JOURNAL(p_s_sb)->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged) ; if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */ atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wcount)) ; } /* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released ** will be dealt with by next transaction that actually writes something, but should be taken ** care of in this trans */ if (SB_JOURNAL(p_s_sb)->j_len == 0) { int wcount = atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) ; unlock_journal(p_s_sb) ; if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) > 0 && wcount <= 0) { atomic_dec(&(SB_JOURNAL(p_s_sb)->j_jlock)) ; wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; } return 0 ; } /* if wcount > 0, and we are called to with flush or commit_now, ** we wait on j_join_wait. We will wake up when the last writer has ** finished the transaction, and started it on its way to the disk. ** Then, we flush the commit or journal list, and just return 0 ** because the rest of journal end was already done for this transaction. */ if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) { if (flush || commit_now) { int orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ; if (flush) { SB_JOURNAL(p_s_sb)->j_next_full_flush = 1 ; } unlock_journal(p_s_sb) ; /* sleep while the current transaction is still j_jlocked */ while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) && SB_JOURNAL(p_s_sb)->j_trans_id == th->t_trans_id) { sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; } if (commit_now) { if (wait_on_commit) { flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ; } else { commit_flush_async(p_s_sb, orig_jindex) ; } } return 0 ; } unlock_journal(p_s_sb) ; return 0 ; } /* deal with old transactions where we are the last writers */ now = CURRENT_TIME ; if ((now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > SB_JOURNAL_MAX_TRANS_AGE(p_s_sb)) { commit_now = 1 ; SB_JOURNAL(p_s_sb)->j_next_async_flush = 1 ; } /* don't batch when someone is waiting on j_join_wait */ /* don't batch when syncing the commit or flushing the whole trans */ if (!(SB_JOURNAL(p_s_sb)->j_must_wait > 0) && !(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock))) && !flush && !commit_now && (SB_JOURNAL(p_s_sb)->j_len < SB_JOURNAL_MAX_BATCH(p_s_sb)) && SB_JOURNAL(p_s_sb)->j_len_alloc < SB_JOURNAL_MAX_BATCH(p_s_sb) && SB_JOURNAL(p_s_sb)->j_cnode_free > (SB_JOURNAL_TRANS_MAX(p_s_sb) * 3)) { SB_JOURNAL(p_s_sb)->j_bcount++ ; unlock_journal(p_s_sb) ; return 0 ; } if (SB_JOURNAL(p_s_sb)->j_start > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) { reiserfs_panic(p_s_sb, "journal-003: journal_end: j_start (%ld) is too high\n", SB_JOURNAL(p_s_sb)->j_start) ; } return 1 ; } /* ** Does all the work that makes deleting blocks safe. ** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on. ** ** otherwise: ** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes ** before this transaction has finished. ** ** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with ** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash, ** the block can't be reallocated yet. ** ** Then remove it from the current transaction, decrementing any counters and filing it on the clean list. */ int journal_mark_freed(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long blocknr) { struct reiserfs_journal_cnode *cn = NULL ; struct buffer_head *bh = NULL ; struct reiserfs_list_bitmap *jb = NULL ; int cleaned = 0 ; if (reiserfs_dont_log(th->t_super)) { bh = sb_get_hash_table(p_s_sb, blocknr) ; if (bh && buffer_dirty (bh)) { reiserfs_warning (p_s_sb, "journal_mark_freed(dont_log): dirty buffer on hash list: %lx %ld\n", bh->b_state, blocknr); BUG (); } brelse (bh); return 0 ; } bh = sb_get_hash_table(p_s_sb, blocknr) ; /* if it is journal new, we just remove it from this transaction */ if (bh && buffer_journal_new(bh)) { mark_buffer_notjournal_new(bh) ; clear_prepared_bits(bh) ; cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ; } else { /* set the bit for this block in the journal bitmap for this transaction */ jb = SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap ; if (!jb) { reiserfs_panic(p_s_sb, "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n") ; } set_bit_in_list_bitmap(p_s_sb, blocknr, jb) ; /* Note, the entire while loop is not allowed to schedule. */ if (bh) { clear_prepared_bits(bh) ; } cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ; /* find all older transactions with this block, make sure they don't try to write it out */ cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, p_s_sb->s_dev, blocknr, p_s_sb->s_blocksize) ; while (cn) { if (p_s_sb->s_dev == cn->dev && blocknr == cn->blocknr) { set_bit(BLOCK_FREED, &cn->state) ; if (cn->bh) { if (!cleaned) { /* remove_from_transaction will brelse the buffer if it was ** in the current trans */ mark_buffer_notjournal_dirty(cn->bh) ; cleaned = 1 ; put_bh(cn->bh) ; if (atomic_read(&(cn->bh->b_count)) < 0) { reiserfs_warning(p_s_sb, "journal-2138: cn->bh->b_count < 0\n") ; } } if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */ atomic_dec(&(cn->jlist->j_nonzerolen)) ; } cn->bh = NULL ; } } cn = cn->hnext ; } } if (bh) { reiserfs_clean_and_file_buffer(bh) ; put_bh(bh) ; /* get_hash grabs the buffer */ if (atomic_read(&(bh->b_count)) < 0) { reiserfs_warning(p_s_sb, "journal-2165: bh->b_count < 0\n") ; } } return 0 ; } void reiserfs_update_inode_transaction(struct inode *inode) { inode->u.reiserfs_i.i_trans_index = SB_JOURNAL_LIST_INDEX(inode->i_sb); inode->u.reiserfs_i.i_trans_id = SB_JOURNAL(inode->i_sb)->j_trans_id ; } void reiserfs_update_tail_transaction(struct inode *inode) { inode->u.reiserfs_i.i_tail_trans_index = SB_JOURNAL_LIST_INDEX(inode->i_sb); inode->u.reiserfs_i.i_tail_trans_id = SB_JOURNAL(inode->i_sb)->j_trans_id ; } static void __commit_trans_index(struct inode *inode, unsigned long id, unsigned long index) { struct reiserfs_journal_list *jl ; struct reiserfs_transaction_handle th ; struct super_block *sb = inode->i_sb ; jl = SB_JOURNAL_LIST(sb) + index; /* is it from the current transaction, or from an unknown transaction? */ if (id == SB_JOURNAL(sb)->j_trans_id) { journal_join(&th, sb, 1) ; journal_end_sync(&th, sb, 1) ; } else if (jl->j_trans_id == id) { flush_commit_list(sb, jl, 1) ; } /* if the transaction id does not match, this list is long since flushed ** and we don't have to do anything here */ } void reiserfs_commit_for_tail(struct inode *inode) { unsigned long id = inode->u.reiserfs_i.i_tail_trans_id; unsigned long index = inode->u.reiserfs_i.i_tail_trans_index; /* for tails, if this info is unset there's nothing to commit */ if (id && index) __commit_trans_index(inode, id, index); } void reiserfs_commit_for_inode(struct inode *inode) { unsigned long id = inode->u.reiserfs_i.i_trans_id; unsigned long index = inode->u.reiserfs_i.i_trans_index; /* for the whole inode, assume unset id or index means it was * changed in the current transaction. More conservative */ if (!id || !index) reiserfs_update_inode_transaction(inode) ; __commit_trans_index(inode, id, index); } void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb, struct buffer_head *bh) { PROC_INFO_INC( p_s_sb, journal.restore_prepared ); if (reiserfs_dont_log (p_s_sb)) return; if (!bh) { return ; } clear_bit(BH_JPrepared, &bh->b_state) ; } extern struct tree_balance *cur_tb ; /* ** before we can change a metadata block, we have to make sure it won't ** be written to disk while we are altering it. So, we must: ** clean it ** wait on it. ** */ void reiserfs_prepare_for_journal(struct super_block *p_s_sb, struct buffer_head *bh, int wait) { int retry_count = 0 ; PROC_INFO_INC( p_s_sb, journal.prepare ); if (reiserfs_dont_log (p_s_sb)) return; while(!test_bit(BH_JPrepared, &bh->b_state) || (wait && buffer_locked(bh))) { if (buffer_journaled(bh)) { set_bit(BH_JPrepared, &bh->b_state) ; return ; } set_bit(BH_JPrepared, &bh->b_state) ; if (wait) { RFALSE( buffer_locked(bh) && cur_tb != NULL, "waiting while do_balance was running\n") ; wait_on_buffer(bh) ; } PROC_INFO_INC( p_s_sb, journal.prepare_retry ); retry_count++ ; } } /* ** long and ugly. If flush, will not return until all commit ** blocks and all real buffers in the trans are on disk. ** If no_async, won't return until all commit blocks are on disk. ** ** keep reading, there are comments as you go along */ static int do_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks, int flags) { struct reiserfs_journal_cnode *cn, *next, *jl_cn; struct reiserfs_journal_cnode *last_cn = NULL; struct reiserfs_journal_desc *desc ; struct reiserfs_journal_commit *commit ; struct buffer_head *c_bh ; /* commit bh */ struct buffer_head *d_bh ; /* desc bh */ int cur_write_start = 0 ; /* start index of current log write */ int cur_blocks_left = 0 ; /* number of journal blocks left to write */ int old_start ; int i ; int jindex ; int orig_jindex ; int flush = flags & FLUSH_ALL ; int commit_now = flags & COMMIT_NOW ; int wait_on_commit = flags & WAIT ; struct reiserfs_super_block *rs ; if (reiserfs_dont_log(th->t_super)) { return 0 ; } lock_journal(p_s_sb) ; if (SB_JOURNAL(p_s_sb)->j_next_full_flush) { flags |= FLUSH_ALL ; flush = 1 ; } if (SB_JOURNAL(p_s_sb)->j_next_async_flush) { flags |= COMMIT_NOW ; commit_now = 1 ; } /* check_journal_end locks the journal, and unlocks if it does not return 1 ** it tells us if we should continue with the journal_end, or just return */ if (!check_journal_end(th, p_s_sb, nblocks, flags)) { return 0 ; } /* check_journal_end might set these, check again */ if (SB_JOURNAL(p_s_sb)->j_next_full_flush) { flush = 1 ; } if (SB_JOURNAL(p_s_sb)->j_next_async_flush) { commit_now = 1 ; } /* ** j must wait means we have to flush the log blocks, and the real blocks for ** this transaction */ if (SB_JOURNAL(p_s_sb)->j_must_wait > 0) { flush = 1 ; } #ifdef REISERFS_PREALLOCATE reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into * the transaction */ #endif rs = SB_DISK_SUPER_BLOCK(p_s_sb) ; /* setup description block */ d_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start) ; mark_buffer_uptodate(d_bh, 1) ; desc = (struct reiserfs_journal_desc *)(d_bh)->b_data ; memset(desc, 0, sizeof(struct reiserfs_journal_desc)) ; memcpy(desc->j_magic, JOURNAL_DESC_MAGIC, 8) ; desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ; /* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */ c_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ; commit = (struct reiserfs_journal_commit *)c_bh->b_data ; memset(commit, 0, sizeof(struct reiserfs_journal_commit)) ; commit->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ; mark_buffer_uptodate(c_bh, 1) ; /* init this journal list */ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_older_commits_done), 0) ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_timestamp = SB_JOURNAL(p_s_sb)->j_trans_start_time ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_bh = c_bh ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_start = SB_JOURNAL(p_s_sb)->j_start ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len = SB_JOURNAL(p_s_sb)->j_len ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_nonzerolen), SB_JOURNAL(p_s_sb)->j_len) ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_left), SB_JOURNAL(p_s_sb)->j_len + 2); SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = NULL ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ; /* which is faster, locking/unlocking at the start and end of the for ** or locking once per iteration around the insert_journal_hash? ** eitherway, we are write locking insert_journal_hash. The ENTIRE FOR ** LOOP MUST not cause schedule to occur. */ /* for each real block, add it to the journal list hash, ** copy into real block index array in the commit or desc block */ for (i = 0, cn = SB_JOURNAL(p_s_sb)->j_first ; cn ; cn = cn->next, i++) { if (test_bit(BH_JDirty, &cn->bh->b_state) ) { jl_cn = get_cnode(p_s_sb) ; if (!jl_cn) { reiserfs_panic(p_s_sb, "journal-1676, get_cnode returned NULL\n") ; } if (i == 0) { SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = jl_cn ; } jl_cn->prev = last_cn ; jl_cn->next = NULL ; if (last_cn) { last_cn->next = jl_cn ; } last_cn = jl_cn ; /* make sure the block we are trying to log is not a block of journal or reserved area */ if (is_block_in_log_or_reserved_area(p_s_sb, cn->bh->b_blocknr)) { reiserfs_panic(p_s_sb, "journal-2332: Trying to log block %lu, which is a log block\n", cn->bh->b_blocknr) ; } jl_cn->blocknr = cn->bh->b_blocknr ; jl_cn->state = 0 ; jl_cn->dev = cn->bh->b_dev ; jl_cn->bh = cn->bh ; jl_cn->jlist = SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb) ; insert_journal_hash(SB_JOURNAL(p_s_sb)->j_list_hash_table, jl_cn) ; if (i < JOURNAL_TRANS_HALF) { desc->j_realblock[i] = cpu_to_le32(cn->bh->b_blocknr) ; } else { commit->j_realblock[i - JOURNAL_TRANS_HALF] = cpu_to_le32(cn->bh->b_blocknr) ; } } else { i-- ; } } desc->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ; desc->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ; desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ; commit->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ; /* special check in case all buffers in the journal were marked for not logging */ if (SB_JOURNAL(p_s_sb)->j_len == 0) { brelse(d_bh) ; brelse(c_bh) ; unlock_journal(p_s_sb) ; reiserfs_warning(p_s_sb, "journal-2020: do_journal_end: BAD desc->j_len is ZERO\n") ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ; wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; return 0 ; } /* first data block is j_start + 1, so add one to cur_write_start wherever you use it */ cur_write_start = SB_JOURNAL(p_s_sb)->j_start ; cur_blocks_left = SB_JOURNAL(p_s_sb)->j_len ; cn = SB_JOURNAL(p_s_sb)->j_first ; jindex = 1 ; /* start at one so we don't get the desc again */ while(cur_blocks_left > 0) { /* copy all the real blocks into log area. dirty log blocks */ if (test_bit(BH_JDirty, &cn->bh->b_state)) { struct buffer_head *tmp_bh ; tmp_bh = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((cur_write_start + jindex) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ; mark_buffer_uptodate(tmp_bh, 1) ; memcpy(tmp_bh->b_data, cn->bh->b_data, cn->bh->b_size) ; jindex++ ; } else { /* JDirty cleared sometime during transaction. don't log this one */ reiserfs_warning(p_s_sb, "journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!\n") ; } cn = cn->next ; cur_blocks_left-- ; } /* we are done with both the c_bh and d_bh, but ** c_bh must be written after all other commit blocks, ** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. */ /* now loop through and mark all buffers from this transaction as JDirty_wait ** clear the JDirty bit, clear BH_JNew too. ** if they weren't JDirty, they weren't logged, just relse them and move on */ cn = SB_JOURNAL(p_s_sb)->j_first ; while(cn) { clear_bit(BH_JNew, &(cn->bh->b_state)) ; if (test_bit(BH_JDirty, &(cn->bh->b_state))) { set_bit(BH_JDirty_wait, &(cn->bh->b_state)) ; clear_bit(BH_JDirty, &(cn->bh->b_state)) ; } else { brelse(cn->bh) ; } next = cn->next ; free_cnode(p_s_sb, cn) ; cn = next ; } /* unlock the journal list for committing and flushing */ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 0) ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 0) ; orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ; jindex = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ; SB_JOURNAL_LIST_INDEX(p_s_sb) = jindex ; /* write any buffers that must hit disk before this commit is done */ fsync_buffers_list(&(SB_JOURNAL(p_s_sb)->j_dirty_buffers)) ; /* honor the flush and async wishes from the caller */ if (flush) { flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ; flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex , 1) ; } else if (commit_now) { if (wait_on_commit) { flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ; } else { commit_flush_async(p_s_sb, orig_jindex) ; } } /* reset journal values for the next transaction */ old_start = SB_JOURNAL(p_s_sb)->j_start ; SB_JOURNAL(p_s_sb)->j_start = (SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb); atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ; SB_JOURNAL(p_s_sb)->j_bcount = 0 ; SB_JOURNAL(p_s_sb)->j_last = NULL ; SB_JOURNAL(p_s_sb)->j_first = NULL ; SB_JOURNAL(p_s_sb)->j_len = 0 ; SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ; SB_JOURNAL(p_s_sb)->j_trans_id++ ; SB_JOURNAL(p_s_sb)->j_must_wait = 0 ; SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ; SB_JOURNAL(p_s_sb)->j_next_full_flush = 0 ; SB_JOURNAL(p_s_sb)->j_next_async_flush = 0 ; init_journal_hash(p_s_sb) ; /* if the next transaction has any chance of wrapping, flush ** transactions that might get overwritten. If any journal lists are very ** old flush them as well. */ for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) { jindex = i ; if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 && SB_JOURNAL(p_s_sb)->j_start <= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) { if ((SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL_TRANS_MAX(p_s_sb) + 1) >= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) { flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ; } } else if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 && (SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL_TRANS_MAX(p_s_sb) + 1) > SB_ONDISK_JOURNAL_SIZE(p_s_sb)) { if (((SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL_TRANS_MAX(p_s_sb) + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)) >= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) { flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ; } } /* this check should always be run, to send old lists to disk */ if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 && SB_JOURNAL_LIST(p_s_sb)[jindex].j_timestamp < (CURRENT_TIME - (SB_JOURNAL_MAX_TRANS_AGE(p_s_sb) * 4))) { flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ; } } /* if the next journal_list is still in use, flush it */ if (SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len != 0) { flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb), 1) ; } /* we don't want anyone flushing the new transaction's list */ atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ; atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ; SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb)) ; if (!(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap)) { reiserfs_panic(p_s_sb, "journal-1996: do_journal_end, could not get a list bitmap\n") ; } unlock_journal(p_s_sb) ; atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ; /* wake up any body waiting to join. */ wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ; return 0 ; }
Go to most recent revision | Compare with Previous | Blame | View Log