| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Write ahead logging implementation copyright Chris Mason 2000 |
| * |
| * The background commits make this code very interrelated, 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 |
| */ |
| |
| #include <linux/time.h> |
| #include <linux/semaphore.h> |
| #include <linux/vmalloc.h> |
| #include "reiserfs.h" |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/fcntl.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/buffer_head.h> |
| #include <linux/workqueue.h> |
| #include <linux/writeback.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/uaccess.h> |
| #include <linux/slab.h> |
| |
| |
| /* gets a struct reiserfs_journal_list * from a list head */ |
| #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ |
| j_list)) |
| #define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ |
| j_working_list)) |
| |
| /* must be correct to keep the desc and commit structs at 4k */ |
| #define JOURNAL_TRANS_HALF 1018 |
| #define BUFNR 64 /*read ahead */ |
| |
| /* cnode stat bits. Move these into reiserfs_fs.h */ |
| |
| /* this block was freed, and can't be written. */ |
| #define BLOCK_FREED 2 |
| /* this block was freed during this transaction, and can't be written */ |
| #define BLOCK_FREED_HOLDER 3 |
| |
| /* used in flush_journal_list */ |
| #define BLOCK_NEEDS_FLUSH 4 |
| #define BLOCK_DIRTIED 5 |
| |
| /* journal list state bits */ |
| #define LIST_TOUCHED 1 |
| #define LIST_DIRTY 2 |
| #define LIST_COMMIT_PENDING 4 /* someone will commit this 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 */ |
| |
| static int do_journal_end(struct reiserfs_transaction_handle *, 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 journal_join(struct reiserfs_transaction_handle *th, |
| struct super_block *sb); |
| static void release_journal_dev(struct super_block *super, |
| struct reiserfs_journal *journal); |
| static int dirty_one_transaction(struct super_block *s, |
| struct reiserfs_journal_list *jl); |
| static void flush_async_commits(struct work_struct *work); |
| static void queue_log_writer(struct super_block *s); |
| |
| /* values for join in do_journal_begin_r */ |
| enum { |
| JBEGIN_REG = 0, /* regular journal begin */ |
| /* join the running transaction if at all possible */ |
| JBEGIN_JOIN = 1, |
| /* called from cleanup code, ignores aborted flag */ |
| JBEGIN_ABORT = 2, |
| }; |
| |
| static int do_journal_begin_r(struct reiserfs_transaction_handle *th, |
| struct super_block *sb, |
| unsigned long nblocks, int join); |
| |
| static void init_journal_hash(struct super_block *sb) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| memset(journal->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_buffer_dirty(bh); |
| clear_buffer_journal_test(bh); |
| } |
| return 0; |
| } |
| |
| static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block |
| *sb) |
| { |
| struct reiserfs_bitmap_node *bn; |
| static int id; |
| |
| bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); |
| if (!bn) { |
| return NULL; |
| } |
| bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); |
| if (!bn->data) { |
| kfree(bn); |
| return NULL; |
| } |
| bn->id = id++; |
| INIT_LIST_HEAD(&bn->list); |
| return bn; |
| } |
| |
| static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_bitmap_node *bn = NULL; |
| struct list_head *entry = journal->j_bitmap_nodes.next; |
| |
| journal->j_used_bitmap_nodes++; |
| repeat: |
| |
| if (entry != &journal->j_bitmap_nodes) { |
| bn = list_entry(entry, struct reiserfs_bitmap_node, list); |
| list_del(entry); |
| memset(bn->data, 0, sb->s_blocksize); |
| journal->j_free_bitmap_nodes--; |
| return bn; |
| } |
| bn = allocate_bitmap_node(sb); |
| if (!bn) { |
| yield(); |
| goto repeat; |
| } |
| return bn; |
| } |
| static inline void free_bitmap_node(struct super_block *sb, |
| struct reiserfs_bitmap_node *bn) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| journal->j_used_bitmap_nodes--; |
| if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { |
| kfree(bn->data); |
| kfree(bn); |
| } else { |
| list_add(&bn->list, &journal->j_bitmap_nodes); |
| journal->j_free_bitmap_nodes++; |
| } |
| } |
| |
| static void allocate_bitmap_nodes(struct super_block *sb) |
| { |
| int i; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_bitmap_node *bn = NULL; |
| for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { |
| bn = allocate_bitmap_node(sb); |
| if (bn) { |
| list_add(&bn->list, &journal->j_bitmap_nodes); |
| journal->j_free_bitmap_nodes++; |
| } else { |
| /* this is ok, we'll try again when more are needed */ |
| break; |
| } |
| } |
| } |
| |
| static int set_bit_in_list_bitmap(struct super_block *sb, |
| b_blocknr_t block, |
| struct reiserfs_list_bitmap *jb) |
| { |
| unsigned int bmap_nr = block / (sb->s_blocksize << 3); |
| unsigned int bit_nr = block % (sb->s_blocksize << 3); |
| |
| if (!jb->bitmaps[bmap_nr]) { |
| jb->bitmaps[bmap_nr] = get_bitmap_node(sb); |
| } |
| set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); |
| return 0; |
| } |
| |
| static void cleanup_bitmap_list(struct super_block *sb, |
| struct reiserfs_list_bitmap *jb) |
| { |
| int i; |
| if (jb->bitmaps == NULL) |
| return; |
| |
| for (i = 0; i < reiserfs_bmap_count(sb); i++) { |
| if (jb->bitmaps[i]) { |
| free_bitmap_node(sb, jb->bitmaps[i]); |
| jb->bitmaps[i] = NULL; |
| } |
| } |
| } |
| |
| /* |
| * only call this on FS unmount. |
| */ |
| static int free_list_bitmaps(struct super_block *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(sb, jb); |
| vfree(jb->bitmaps); |
| jb->bitmaps = NULL; |
| } |
| return 0; |
| } |
| |
| static int free_bitmap_nodes(struct super_block *sb) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct list_head *next = journal->j_bitmap_nodes.next; |
| struct reiserfs_bitmap_node *bn; |
| |
| while (next != &journal->j_bitmap_nodes) { |
| bn = list_entry(next, struct reiserfs_bitmap_node, list); |
| list_del(next); |
| kfree(bn->data); |
| kfree(bn); |
| next = journal->j_bitmap_nodes.next; |
| journal->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 *sb, |
| struct reiserfs_list_bitmap *jb_array, |
| unsigned 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 = vzalloc(mem); |
| if (!jb->bitmaps) { |
| reiserfs_warning(sb, "clm-2000", "unable to " |
| "allocate bitmaps for journal lists"); |
| failed = 1; |
| break; |
| } |
| } |
| if (failed) { |
| free_list_bitmaps(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 *sb, |
| struct reiserfs_journal_list |
| *jl) |
| { |
| int i, j; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_list_bitmap *jb = NULL; |
| |
| for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { |
| i = journal->j_list_bitmap_index; |
| journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; |
| jb = journal->j_list_bitmap + i; |
| if (journal->j_list_bitmap[i].journal_list) { |
| flush_commit_list(sb, |
| journal->j_list_bitmap[i]. |
| journal_list, 1); |
| if (!journal->j_list_bitmap[i].journal_list) { |
| break; |
| } |
| } else { |
| break; |
| } |
| } |
| /* double check to make sure if flushed correctly */ |
| if (jb->journal_list) |
| 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 = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)); |
| if (!head) { |
| return NULL; |
| } |
| 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 *sb) |
| { |
| struct reiserfs_journal_cnode *cn; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| |
| reiserfs_check_lock_depth(sb, "get_cnode"); |
| |
| if (journal->j_cnode_free <= 0) { |
| return NULL; |
| } |
| journal->j_cnode_used++; |
| journal->j_cnode_free--; |
| cn = journal->j_cnode_free_list; |
| if (!cn) { |
| return cn; |
| } |
| if (cn->next) { |
| cn->next->prev = NULL; |
| } |
| journal->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 *sb, |
| struct reiserfs_journal_cnode *cn) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| |
| reiserfs_check_lock_depth(sb, "free_cnode"); |
| |
| journal->j_cnode_used--; |
| journal->j_cnode_free++; |
| /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ |
| cn->next = journal->j_cnode_free_list; |
| if (journal->j_cnode_free_list) { |
| journal->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 */ |
| journal->j_cnode_free_list = cn; |
| } |
| |
| static void clear_prepared_bits(struct buffer_head *bh) |
| { |
| clear_buffer_journal_prepared(bh); |
| clear_buffer_journal_restore_dirty(bh); |
| } |
| |
| /* |
| * 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 |
| super_block |
| *sb, |
| struct |
| reiserfs_journal_cnode |
| **table, |
| long bl) |
| { |
| struct reiserfs_journal_cnode *cn; |
| cn = journal_hash(table, sb, bl); |
| while (cn) { |
| if (cn->blocknr == bl && cn->sb == sb) |
| return cn; |
| cn = cn->hnext; |
| } |
| return (struct reiserfs_journal_cnode *)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 *sb, |
| unsigned int bmap_nr, int bit_nr, int search_all, |
| b_blocknr_t * next_zero_bit) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_journal_cnode *cn; |
| struct reiserfs_list_bitmap *jb; |
| int i; |
| unsigned long bl; |
| |
| *next_zero_bit = 0; /* always start this at zero. */ |
| |
| PROC_INFO_INC(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(sb, journal.in_journal_bitmap); |
| jb = journal->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), |
| sb->s_blocksize << 3, |
| bit_nr + 1); |
| return 1; |
| } |
| } |
| } |
| |
| bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; |
| /* is it in any old transactions? */ |
| if (search_all |
| && (cn = |
| get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { |
| return 1; |
| } |
| |
| /* is it in the current transaction. This should never happen */ |
| if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) { |
| BUG(); |
| return 1; |
| } |
| |
| PROC_INFO_INC(sb, journal.in_journal_reusable); |
| /* safe for reuse */ |
| return 0; |
| } |
| |
| /* insert cn into table */ |
| static 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->sb, cn->blocknr); |
| cn->hnext = cn_orig; |
| cn->hprev = NULL; |
| if (cn_orig) { |
| cn_orig->hprev = cn; |
| } |
| journal_hash(table, cn->sb, cn->blocknr) = cn; |
| } |
| |
| /* lock the current transaction */ |
| static inline void lock_journal(struct super_block *sb) |
| { |
| PROC_INFO_INC(sb, journal.lock_journal); |
| |
| reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); |
| } |
| |
| /* unlock the current transaction */ |
| static inline void unlock_journal(struct super_block *sb) |
| { |
| mutex_unlock(&SB_JOURNAL(sb)->j_mutex); |
| } |
| |
| static inline void get_journal_list(struct reiserfs_journal_list *jl) |
| { |
| jl->j_refcount++; |
| } |
| |
| static inline void put_journal_list(struct super_block *s, |
| struct reiserfs_journal_list *jl) |
| { |
| if (jl->j_refcount < 1) { |
| reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", |
| jl->j_trans_id, jl->j_refcount); |
| } |
| if (--jl->j_refcount == 0) |
| kfree(jl); |
| } |
| |
| /* |
| * 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 *sb, |
| struct reiserfs_journal_list *jl) |
| { |
| |
| struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; |
| if (jb) { |
| cleanup_bitmap_list(sb, jb); |
| } |
| jl->j_list_bitmap->journal_list = NULL; |
| jl->j_list_bitmap = NULL; |
| } |
| |
| static int journal_list_still_alive(struct super_block *s, |
| unsigned int trans_id) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| struct list_head *entry = &journal->j_journal_list; |
| struct reiserfs_journal_list *jl; |
| |
| if (!list_empty(entry)) { |
| jl = JOURNAL_LIST_ENTRY(entry->next); |
| if (jl->j_trans_id <= trans_id) { |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * If page->mapping was null, we failed to truncate this page for |
| * some reason. Most likely because it was truncated after being |
| * logged via data=journal. |
| * |
| * This does a check to see if the buffer belongs to one of these |
| * lost pages before doing the final put_bh. If page->mapping was |
| * null, it tries to free buffers on the page, which should make the |
| * final put_page drop the page from the lru. |
| */ |
| static void release_buffer_page(struct buffer_head *bh) |
| { |
| struct page *page = bh->b_page; |
| if (!page->mapping && trylock_page(page)) { |
| get_page(page); |
| put_bh(bh); |
| if (!page->mapping) |
| try_to_free_buffers(page); |
| unlock_page(page); |
| put_page(page); |
| } else { |
| put_bh(bh); |
| } |
| } |
| |
| 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:%pg sent to disk", |
| bh->b_blocknr, bh->b_bdev); |
| } |
| if (uptodate) |
| set_buffer_uptodate(bh); |
| else |
| clear_buffer_uptodate(bh); |
| |
| unlock_buffer(bh); |
| release_buffer_page(bh); |
| } |
| |
| static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) |
| { |
| if (uptodate) |
| set_buffer_uptodate(bh); |
| else |
| clear_buffer_uptodate(bh); |
| unlock_buffer(bh); |
| put_bh(bh); |
| } |
| |
| static void submit_logged_buffer(struct buffer_head *bh) |
| { |
| get_bh(bh); |
| bh->b_end_io = reiserfs_end_buffer_io_sync; |
| clear_buffer_journal_new(bh); |
| clear_buffer_dirty(bh); |
| if (!test_clear_buffer_journal_test(bh)) |
| BUG(); |
| if (!buffer_uptodate(bh)) |
| BUG(); |
| submit_bh(REQ_OP_WRITE, 0, bh); |
| } |
| |
| static void submit_ordered_buffer(struct buffer_head *bh) |
| { |
| get_bh(bh); |
| bh->b_end_io = reiserfs_end_ordered_io; |
| clear_buffer_dirty(bh); |
| if (!buffer_uptodate(bh)) |
| BUG(); |
| submit_bh(REQ_OP_WRITE, 0, bh); |
| } |
| |
| #define CHUNK_SIZE 32 |
| struct buffer_chunk { |
| struct buffer_head *bh[CHUNK_SIZE]; |
| int nr; |
| }; |
| |
| static void write_chunk(struct buffer_chunk *chunk) |
| { |
| int i; |
| for (i = 0; i < chunk->nr; i++) { |
| submit_logged_buffer(chunk->bh[i]); |
| } |
| chunk->nr = 0; |
| } |
| |
| static void write_ordered_chunk(struct buffer_chunk *chunk) |
| { |
| int i; |
| for (i = 0; i < chunk->nr; i++) { |
| submit_ordered_buffer(chunk->bh[i]); |
| } |
| chunk->nr = 0; |
| } |
| |
| static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, |
| spinlock_t * lock, void (fn) (struct buffer_chunk *)) |
| { |
| int ret = 0; |
| BUG_ON(chunk->nr >= CHUNK_SIZE); |
| chunk->bh[chunk->nr++] = bh; |
| if (chunk->nr >= CHUNK_SIZE) { |
| ret = 1; |
| if (lock) { |
| spin_unlock(lock); |
| fn(chunk); |
| spin_lock(lock); |
| } else { |
| fn(chunk); |
| } |
| } |
| return ret; |
| } |
| |
| static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); |
| static struct reiserfs_jh *alloc_jh(void) |
| { |
| struct reiserfs_jh *jh; |
| while (1) { |
| jh = kmalloc(sizeof(*jh), GFP_NOFS); |
| if (jh) { |
| atomic_inc(&nr_reiserfs_jh); |
| return jh; |
| } |
| yield(); |
| } |
| } |
| |
| /* |
| * we want to free the jh when the buffer has been written |
| * and waited on |
| */ |
| void reiserfs_free_jh(struct buffer_head *bh) |
| { |
| struct reiserfs_jh *jh; |
| |
| jh = bh->b_private; |
| if (jh) { |
| bh->b_private = NULL; |
| jh->bh = NULL; |
| list_del_init(&jh->list); |
| kfree(jh); |
| if (atomic_read(&nr_reiserfs_jh) <= 0) |
| BUG(); |
| atomic_dec(&nr_reiserfs_jh); |
| put_bh(bh); |
| } |
| } |
| |
| static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, |
| int tail) |
| { |
| struct reiserfs_jh *jh; |
| |
| if (bh->b_private) { |
| spin_lock(&j->j_dirty_buffers_lock); |
| if (!bh->b_private) { |
| spin_unlock(&j->j_dirty_buffers_lock); |
| goto no_jh; |
| } |
| jh = bh->b_private; |
| list_del_init(&jh->list); |
| } else { |
| no_jh: |
| get_bh(bh); |
| jh = alloc_jh(); |
| spin_lock(&j->j_dirty_buffers_lock); |
| /* |
| * buffer must be locked for __add_jh, should be able to have |
| * two adds at the same time |
| */ |
| BUG_ON(bh->b_private); |
| jh->bh = bh; |
| bh->b_private = jh; |
| } |
| jh->jl = j->j_current_jl; |
| if (tail) |
| list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); |
| else { |
| list_add_tail(&jh->list, &jh->jl->j_bh_list); |
| } |
| spin_unlock(&j->j_dirty_buffers_lock); |
| return 0; |
| } |
| |
| int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) |
| { |
| return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); |
| } |
| int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) |
| { |
| return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); |
| } |
| |
| #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) |
| static int write_ordered_buffers(spinlock_t * lock, |
| struct reiserfs_journal *j, |
| struct reiserfs_journal_list *jl, |
| struct list_head *list) |
| { |
| struct buffer_head *bh; |
| struct reiserfs_jh *jh; |
| int ret = j->j_errno; |
| struct buffer_chunk chunk; |
| struct list_head tmp; |
| INIT_LIST_HEAD(&tmp); |
| |
| chunk.nr = 0; |
| spin_lock(lock); |
| while (!list_empty(list)) { |
| jh = JH_ENTRY(list->next); |
| bh = jh->bh; |
| get_bh(bh); |
| if (!trylock_buffer(bh)) { |
| if (!buffer_dirty(bh)) { |
| list_move(&jh->list, &tmp); |
| goto loop_next; |
| } |
| spin_unlock(lock); |
| if (chunk.nr) |
| write_ordered_chunk(&chunk); |
| wait_on_buffer(bh); |
| cond_resched(); |
| spin_lock(lock); |
| goto loop_next; |
| } |
| /* |
| * in theory, dirty non-uptodate buffers should never get here, |
| * but the upper layer io error paths still have a few quirks. |
| * Handle them here as gracefully as we can |
| */ |
| if (!buffer_uptodate(bh) && buffer_dirty(bh)) { |
| clear_buffer_dirty(bh); |
| ret = -EIO; |
| } |
| if (buffer_dirty(bh)) { |
| list_move(&jh->list, &tmp); |
| add_to_chunk(&chunk, bh, lock, write_ordered_chunk); |
| } else { |
| reiserfs_free_jh(bh); |
| unlock_buffer(bh); |
| } |
| loop_next: |
| put_bh(bh); |
| cond_resched_lock(lock); |
| } |
| if (chunk.nr) { |
| spin_unlock(lock); |
| write_ordered_chunk(&chunk); |
| spin_lock(lock); |
| } |
| while (!list_empty(&tmp)) { |
| jh = JH_ENTRY(tmp.prev); |
| bh = jh->bh; |
| get_bh(bh); |
| reiserfs_free_jh(bh); |
| |
| if (buffer_locked(bh)) { |
| spin_unlock(lock); |
| wait_on_buffer(bh); |
| spin_lock(lock); |
| } |
| if (!buffer_uptodate(bh)) { |
| ret = -EIO; |
| } |
| /* |
| * ugly interaction with invalidatepage here. |
| * reiserfs_invalidate_page will pin any buffer that has a |
| * valid journal head from an older transaction. If someone |
| * else sets our buffer dirty after we write it in the first |
| * loop, and then someone truncates the page away, nobody |
| * will ever write the buffer. We're safe if we write the |
| * page one last time after freeing the journal header. |
| */ |
| if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) { |
| spin_unlock(lock); |
| ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); |
| spin_lock(lock); |
| } |
| put_bh(bh); |
| cond_resched_lock(lock); |
| } |
| spin_unlock(lock); |
| return ret; |
| } |
| |
| static int flush_older_commits(struct super_block *s, |
| struct reiserfs_journal_list *jl) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| struct reiserfs_journal_list *other_jl; |
| struct reiserfs_journal_list *first_jl; |
| struct list_head *entry; |
| unsigned int trans_id = jl->j_trans_id; |
| unsigned int other_trans_id; |
| unsigned int first_trans_id; |
| |
| find_first: |
| /* |
| * first we walk backwards to find the oldest uncommitted transation |
| */ |
| first_jl = jl; |
| entry = jl->j_list.prev; |
| while (1) { |
| other_jl = JOURNAL_LIST_ENTRY(entry); |
| if (entry == &journal->j_journal_list || |
| atomic_read(&other_jl->j_older_commits_done)) |
| break; |
| |
| first_jl = other_jl; |
| entry = other_jl->j_list.prev; |
| } |
| |
| /* if we didn't find any older uncommitted transactions, return now */ |
| if (first_jl == jl) { |
| return 0; |
| } |
| |
| first_trans_id = first_jl->j_trans_id; |
| |
| entry = &first_jl->j_list; |
| while (1) { |
| other_jl = JOURNAL_LIST_ENTRY(entry); |
| other_trans_id = other_jl->j_trans_id; |
| |
| if (other_trans_id < trans_id) { |
| if (atomic_read(&other_jl->j_commit_left) != 0) { |
| flush_commit_list(s, other_jl, 0); |
| |
| /* list we were called with is gone, return */ |
| if (!journal_list_still_alive(s, trans_id)) |
| return 1; |
| |
| /* |
| * the one we just flushed is gone, this means |
| * all older lists are also gone, so first_jl |
| * is no longer valid either. Go back to the |
| * beginning. |
| */ |
| if (!journal_list_still_alive |
| (s, other_trans_id)) { |
| goto find_first; |
| } |
| } |
| entry = entry->next; |
| if (entry == &journal->j_journal_list) |
| return 0; |
| } else { |
| return 0; |
| } |
| } |
| return 0; |
| } |
| |
| static int reiserfs_async_progress_wait(struct super_block *s) |
| { |
| struct reiserfs_journal *j = SB_JOURNAL(s); |
| |
| if (atomic_read(&j->j_async_throttle)) { |
| int depth; |
| |
| depth = reiserfs_write_unlock_nested(s); |
| congestion_wait(BLK_RW_ASYNC, HZ / 10); |
| reiserfs_write_lock_nested(s, depth); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 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; |
| b_blocknr_t bn; |
| struct buffer_head *tbh = NULL; |
| unsigned int trans_id = jl->j_trans_id; |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| int retval = 0; |
| int write_len; |
| int depth; |
| |
| reiserfs_check_lock_depth(s, "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 |
| */ |
| BUG_ON(jl->j_len <= 0); |
| BUG_ON(trans_id == journal->j_trans_id); |
| |
| get_journal_list(jl); |
| if (flushall) { |
| if (flush_older_commits(s, jl) == 1) { |
| /* |
| * list disappeared during flush_older_commits. |
| * return |
| */ |
| goto put_jl; |
| } |
| } |
| |
| /* make sure nobody is trying to flush this one at the same time */ |
| reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); |
| |
| if (!journal_list_still_alive(s, trans_id)) { |
| mutex_unlock(&jl->j_commit_mutex); |
| goto put_jl; |
| } |
| BUG_ON(jl->j_trans_id == 0); |
| |
| /* this commit is done, exit */ |
| if (atomic_read(&jl->j_commit_left) <= 0) { |
| if (flushall) { |
| atomic_set(&jl->j_older_commits_done, 1); |
| } |
| mutex_unlock(&jl->j_commit_mutex); |
| goto put_jl; |
| } |
| |
| if (!list_empty(&jl->j_bh_list)) { |
| int ret; |
| |
| /* |
| * We might sleep in numerous places inside |
| * write_ordered_buffers. Relax the write lock. |
| */ |
| depth = reiserfs_write_unlock_nested(s); |
| ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, |
| journal, jl, &jl->j_bh_list); |
| if (ret < 0 && retval == 0) |
| retval = ret; |
| reiserfs_write_lock_nested(s, depth); |
| } |
| BUG_ON(!list_empty(&jl->j_bh_list)); |
| /* |
| * for the description block and all the log blocks, submit any buffers |
| * that haven't already reached the disk. Try to write at least 256 |
| * log blocks. later on, we will only wait on blocks that correspond |
| * to this transaction, but while we're unplugging we might as well |
| * get a chunk of data on there. |
| */ |
| atomic_inc(&journal->j_async_throttle); |
| write_len = jl->j_len + 1; |
| if (write_len < 256) |
| write_len = 256; |
| for (i = 0 ; i < write_len ; i++) { |
| bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % |
| SB_ONDISK_JOURNAL_SIZE(s); |
| tbh = journal_find_get_block(s, bn); |
| if (tbh) { |
| if (buffer_dirty(tbh)) { |
| depth = reiserfs_write_unlock_nested(s); |
| ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh); |
| reiserfs_write_lock_nested(s, depth); |
| } |
| put_bh(tbh) ; |
| } |
| } |
| atomic_dec(&journal->j_async_throttle); |
| |
| for (i = 0; i < (jl->j_len + 1); i++) { |
| bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + |
| (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); |
| tbh = journal_find_get_block(s, bn); |
| |
| depth = reiserfs_write_unlock_nested(s); |
| __wait_on_buffer(tbh); |
| reiserfs_write_lock_nested(s, depth); |
| /* |
| * since we're using ll_rw_blk above, it might have skipped |
| * over a locked buffer. Double check here |
| */ |
| /* redundant, sync_dirty_buffer() checks */ |
| if (buffer_dirty(tbh)) { |
| depth = reiserfs_write_unlock_nested(s); |
| sync_dirty_buffer(tbh); |
| reiserfs_write_lock_nested(s, depth); |
| } |
| if (unlikely(!buffer_uptodate(tbh))) { |
| #ifdef CONFIG_REISERFS_CHECK |
| reiserfs_warning(s, "journal-601", |
| "buffer write failed"); |
| #endif |
| retval = -EIO; |
| } |
| /* once for journal_find_get_block */ |
| put_bh(tbh); |
| /* once due to original getblk in do_journal_end */ |
| put_bh(tbh); |
| atomic_dec(&jl->j_commit_left); |
| } |
| |
| BUG_ON(atomic_read(&jl->j_commit_left) != 1); |
| |
| /* |
| * If there was a write error in the journal - we can't commit |
| * this transaction - it will be invalid and, if successful, |
| * will just end up propagating the write error out to |
| * the file system. |
| */ |
| if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { |
| if (buffer_dirty(jl->j_commit_bh)) |
| BUG(); |
| mark_buffer_dirty(jl->j_commit_bh) ; |
| depth = reiserfs_write_unlock_nested(s); |
| if (reiserfs_barrier_flush(s)) |
| __sync_dirty_buffer(jl->j_commit_bh, |
| REQ_SYNC | REQ_PREFLUSH | REQ_FUA); |
| else |
| sync_dirty_buffer(jl->j_commit_bh); |
| reiserfs_write_lock_nested(s, depth); |
| } |
| |
| /* |
| * If there was a write error in the journal - we can't commit this |
| * transaction - it will be invalid and, if successful, will just end |
| * up propagating the write error out to the filesystem. |
| */ |
| if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { |
| #ifdef CONFIG_REISERFS_CHECK |
| reiserfs_warning(s, "journal-615", "buffer write failed"); |
| #endif |
| retval = -EIO; |
| } |
| bforget(jl->j_commit_bh); |
| if (journal->j_last_commit_id != 0 && |
| (jl->j_trans_id - journal->j_last_commit_id) != 1) { |
| reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", |
| journal->j_last_commit_id, jl->j_trans_id); |
| } |
| journal->j_last_commit_id = jl->j_trans_id; |
| |
| /* |
| * 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); |
| |
| retval = retval ? retval : journal->j_errno; |
| |
| /* mark the metadata dirty */ |
| if (!retval) |
| dirty_one_transaction(s, jl); |
| atomic_dec(&jl->j_commit_left); |
| |
| if (flushall) { |
| atomic_set(&jl->j_older_commits_done, 1); |
| } |
| mutex_unlock(&jl->j_commit_mutex); |
| put_jl: |
| put_journal_list(s, jl); |
| |
| if (retval) |
| reiserfs_abort(s, retval, "Journal write error in %s", |
| __func__); |
| return retval; |
| } |
| |
| /* |
| * 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) |
| { |
| struct super_block *sb = cn->sb; |
| b_blocknr_t blocknr = cn->blocknr; |
| |
| cn = cn->hprev; |
| while (cn) { |
| if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { |
| return cn->jlist; |
| } |
| cn = cn->hprev; |
| } |
| return NULL; |
| } |
| |
| static void remove_journal_hash(struct super_block *, |
| struct reiserfs_journal_cnode **, |
| struct reiserfs_journal_list *, unsigned long, |
| int); |
| |
| /* |
| * 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 *sb, |
| struct reiserfs_journal_list *jl, |
| int debug) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| 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_journal_hash? |
| */ |
| while (cn) { |
| if (cn->blocknr != 0) { |
| if (debug) { |
| reiserfs_warning(sb, "reiserfs-2201", |
| "block %u, bh is %d, state %ld", |
| cn->blocknr, cn->bh ? 1 : 0, |
| cn->state); |
| } |
| cn->state = 0; |
| remove_journal_hash(sb, journal->j_list_hash_table, |
| jl, cn->blocknr, 1); |
| } |
| last = cn; |
| cn = cn->next; |
| free_cnode(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 *sb, |
| unsigned long offset, |
| unsigned int trans_id) |
| { |
| struct reiserfs_journal_header *jh; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| int depth; |
| |
| if (reiserfs_is_journal_aborted(journal)) |
| return -EIO; |
| |
| if (trans_id >= journal->j_last_flush_trans_id) { |
| if (buffer_locked((journal->j_header_bh))) { |
| depth = reiserfs_write_unlock_nested(sb); |
| __wait_on_buffer(journal->j_header_bh); |
| reiserfs_write_lock_nested(sb, depth); |
| if (unlikely(!buffer_uptodate(journal->j_header_bh))) { |
| #ifdef CONFIG_REISERFS_CHECK |
| reiserfs_warning(sb, "journal-699", |
| "buffer write failed"); |
| #endif |
| return -EIO; |
| } |
| } |
| journal->j_last_flush_trans_id = trans_id; |
| journal->j_first_unflushed_offset = offset; |
| jh = (struct reiserfs_journal_header *)(journal->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(journal->j_mount_id); |
| |
| set_buffer_dirty(journal->j_header_bh); |
| depth = reiserfs_write_unlock_nested(sb); |
| |
| if (reiserfs_barrier_flush(sb)) |
| __sync_dirty_buffer(journal->j_header_bh, |
| REQ_SYNC | REQ_PREFLUSH | REQ_FUA); |
| else |
| sync_dirty_buffer(journal->j_header_bh); |
| |
| reiserfs_write_lock_nested(sb, depth); |
| if (!buffer_uptodate(journal->j_header_bh)) { |
| reiserfs_warning(sb, "journal-837", |
| "IO error during journal replay"); |
| return -EIO; |
| } |
| } |
| return 0; |
| } |
| |
| static int update_journal_header_block(struct super_block *sb, |
| unsigned long offset, |
| unsigned int trans_id) |
| { |
| return _update_journal_header_block(sb, offset, trans_id); |
| } |
| |
| /* |
| ** 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 *sb, |
| struct reiserfs_journal_list *jl) |
| { |
| struct list_head *entry; |
| struct reiserfs_journal_list *other_jl; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| unsigned int trans_id = jl->j_trans_id; |
| |
| /* |
| * we know we are the only ones flushing things, no extra race |
| * protection is required. |
| */ |
| restart: |
| entry = journal->j_journal_list.next; |
| /* Did we wrap? */ |
| if (entry == &journal->j_journal_list) |
| return 0; |
| other_jl = JOURNAL_LIST_ENTRY(entry); |
| if (other_jl->j_trans_id < trans_id) { |
| BUG_ON(other_jl->j_refcount <= 0); |
| /* do not flush all */ |
| flush_journal_list(sb, other_jl, 0); |
| |
| /* other_jl is now deleted from the list */ |
| goto restart; |
| } |
| return 0; |
| } |
| |
| static void del_from_work_list(struct super_block *s, |
| struct reiserfs_journal_list *jl) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| if (!list_empty(&jl->j_working_list)) { |
| list_del_init(&jl->j_working_list); |
| journal->j_num_work_lists--; |
| } |
| } |
| |
| /* |
| * 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; |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| int err = 0; |
| int depth; |
| |
| BUG_ON(j_len_saved <= 0); |
| |
| if (atomic_read(&journal->j_wcount) != 0) { |
| reiserfs_warning(s, "clm-2048", "called with wcount %d", |
| atomic_read(&journal->j_wcount)); |
| } |
| |
| /* if flushall == 0, the lock is already held */ |
| if (flushall) { |
| reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); |
| } else if (mutex_trylock(&journal->j_flush_mutex)) { |
| BUG(); |
| } |
| |
| count = 0; |
| if (j_len_saved > journal->j_trans_max) { |
| reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", |
| j_len_saved, jl->j_trans_id); |
| 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); |
| |
| if (!(jl->j_state & LIST_DIRTY) |
| && !reiserfs_is_journal_aborted(journal)) |
| BUG(); |
| |
| /* 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(&journal->j_wcount) != 0) { |
| reiserfs_panic(s, "journal-844", "journal list is flushing, " |
| "wcount is not 0"); |
| } |
| 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; |
| } |
| |
| /* |
| * This transaction failed commit. |
| * Don't write out to the disk |
| */ |
| if (!(jl->j_state & LIST_DIRTY)) |
| 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)) { |
| BUG_ON(!can_dirty(cn)); |
| was_jwait = 1; |
| was_dirty = 1; |
| } else if (can_dirty(cn)) { |
| /* |
| * everything with !pjl && jwait |
| * should be writable |
| */ |
| BUG(); |
| } |
| } |
| |
| /* |
| * if someone has this block in a newer transaction, just make |
| * sure they are committed, and don't try writing it to disk |
| */ |
| if (pjl) { |
| if (atomic_read(&pjl->j_commit_left)) |
| 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 %llu %cdirty %cjwait, " |
| "not in a newer transaction", |
| (unsigned long long)saved_bh-> |
| b_blocknr, was_dirty ? ' ' : '!', |
| was_jwait ? ' ' : '!'); |
| } |
| 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); |
| lock_buffer(saved_bh); |
| BUG_ON(cn->blocknr != saved_bh->b_blocknr); |
| if (buffer_dirty(saved_bh)) |
| submit_logged_buffer(saved_bh); |
| else |
| unlock_buffer(saved_bh); |
| count++; |
| } else { |
| reiserfs_warning(s, "clm-2082", |
| "Unable to flush buffer %llu in %s", |
| (unsigned long long)saved_bh-> |
| b_blocknr, __func__); |
| } |
| 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"); |
| } |
| } |
| } |
| 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"); |
| } |
| |
| depth = reiserfs_write_unlock_nested(s); |
| __wait_on_buffer(cn->bh); |
| reiserfs_write_lock_nested(s, depth); |
| |
| if (!cn->bh) { |
| reiserfs_panic(s, "journal-1012", |
| "cn->bh is NULL"); |
| } |
| if (unlikely(!buffer_uptodate(cn->bh))) { |
| #ifdef CONFIG_REISERFS_CHECK |
| reiserfs_warning(s, "journal-949", |
| "buffer write failed"); |
| #endif |
| err = -EIO; |
| } |
| /* |
| * note, we must clear the JDirty_wait bit |
| * after the up to date check, otherwise we |
| * race against our flushpage routine |
| */ |
| BUG_ON(!test_clear_buffer_journal_dirty |
| (cn->bh)); |
| |
| /* drop one ref for us */ |
| put_bh(cn->bh); |
| /* drop one ref for journal_mark_dirty */ |
| release_buffer_page(cn->bh); |
| } |
| cn = cn->next; |
| } |
| } |
| |
| if (err) |
| reiserfs_abort(s, -EIO, |
| "Write error while pushing transaction to disk in %s", |
| __func__); |
| 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); |
| } |
| |
| err = journal->j_errno; |
| /* |
| * 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 (!err && flushall) { |
| err = |
| update_journal_header_block(s, |
| (jl->j_start + jl->j_len + |
| 2) % SB_ONDISK_JOURNAL_SIZE(s), |
| jl->j_trans_id); |
| if (err) |
| reiserfs_abort(s, -EIO, |
| "Write error while updating journal header in %s", |
| __func__); |
| } |
| remove_all_from_journal_list(s, jl, 0); |
| list_del_init(&jl->j_list); |
| journal->j_num_lists--; |
| del_from_work_list(s, jl); |
| |
| if (journal->j_last_flush_id != 0 && |
| (jl->j_trans_id - journal->j_last_flush_id) != 1) { |
| reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", |
| journal->j_last_flush_id, jl->j_trans_id); |
| } |
| journal->j_last_flush_id = jl->j_trans_id; |
| |
| /* |
| * not strictly required since we are freeing the list, but it should |
| * help find code using dead lists later on |
| */ |
| 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; |
| jl->j_state = 0; |
| put_journal_list(s, jl); |
| if (flushall) |
| mutex_unlock(&journal->j_flush_mutex); |
| return err; |
| } |
| |
| static int write_one_transaction(struct super_block *s, |
| struct reiserfs_journal_list *jl, |
| struct buffer_chunk *chunk) |
| { |
| struct reiserfs_journal_cnode *cn; |
| int ret = 0; |
| |
| jl->j_state |= LIST_TOUCHED; |
| del_from_work_list(s, jl); |
| if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { |
| return 0; |
| } |
| |
| cn = jl->j_realblock; |
| while (cn) { |
| /* |
| * if the blocknr == 0, this has been cleared from the hash, |
| * skip it |
| */ |
| if (cn->blocknr == 0) { |
| goto next; |
| } |
| if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { |
| struct buffer_head *tmp_bh; |
| /* |
| * we can race against journal_mark_freed when we try |
| * to lock_buffer(cn->bh), so we have to inc the buffer |
| * count, and recheck things after locking |
| */ |
| tmp_bh = cn->bh; |
| get_bh(tmp_bh); |
| lock_buffer(tmp_bh); |
| if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { |
| if (!buffer_journal_dirty(tmp_bh) || |
| buffer_journal_prepared(tmp_bh)) |
| BUG(); |
| add_to_chunk(chunk, tmp_bh, NULL, write_chunk); |
| ret++; |
| } else { |
| /* note, cn->bh might be null now */ |
| unlock_buffer(tmp_bh); |
| } |
| put_bh(tmp_bh); |
| } |
| next: |
| cn = cn->next; |
| cond_resched(); |
| } |
| return ret; |
| } |
| |
| /* used by flush_commit_list */ |
| static int dirty_one_transaction(struct super_block *s, |
| struct reiserfs_journal_list *jl) |
| { |
| struct reiserfs_journal_cnode *cn; |
| struct reiserfs_journal_list *pjl; |
| int ret = 0; |
| |
| jl->j_state |= LIST_DIRTY; |
| cn = jl->j_realblock; |
| while (cn) { |
| /* |
| * 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 (!pjl && cn->blocknr && cn->bh |
| && buffer_journal_dirty(cn->bh)) { |
| BUG_ON(!can_dirty(cn)); |
| /* |
| * if the buffer is prepared, it will either be logged |
| * or restored. If restored, we need to make sure |
| * it actually gets marked dirty |
| */ |
| clear_buffer_journal_new(cn->bh); |
| if (buffer_journal_prepared(cn->bh)) { |
| set_buffer_journal_restore_dirty(cn->bh); |
| } else { |
| set_buffer_journal_test(cn->bh); |
| mark_buffer_dirty(cn->bh); |
| } |
| } |
| cn = cn->next; |
| } |
| return ret; |
| } |
| |
| static int kupdate_transactions(struct super_block *s, |
| struct reiserfs_journal_list *jl, |
| struct reiserfs_journal_list **next_jl, |
| unsigned int *next_trans_id, |
| int num_blocks, int num_trans) |
| { |
| int ret = 0; |
| int written = 0; |
| int transactions_flushed = 0; |
| unsigned int orig_trans_id = jl->j_trans_id; |
| struct buffer_chunk chunk; |
| struct list_head *entry; |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| chunk.nr = 0; |
| |
| reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); |
| if (!journal_list_still_alive(s, orig_trans_id)) { |
| goto done; |
| } |
| |
| /* |
| * we've got j_flush_mutex held, nobody is going to delete any |
| * of these lists out from underneath us |
| */ |
| while ((num_trans && transactions_flushed < num_trans) || |
| (!num_trans && written < num_blocks)) { |
| |
| if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || |
| atomic_read(&jl->j_commit_left) |
| || !(jl->j_state & LIST_DIRTY)) { |
| del_from_work_list(s, jl); |
| break; |
| } |
| ret = write_one_transaction(s, jl, &chunk); |
| |
| if (ret < 0) |
| goto done; |
| transactions_flushed++; |
| written += ret; |
| entry = jl->j_list.next; |
| |
| /* did we wrap? */ |
| if (entry == &journal->j_journal_list) { |
| break; |
| } |
| jl = JOURNAL_LIST_ENTRY(entry); |
| |
| /* don't bother with older transactions */ |
| if (jl->j_trans_id <= orig_trans_id) |
| break; |
| } |
| if (chunk.nr) { |
| write_chunk(&chunk); |
| } |
| |
| done: |
| mutex_unlock(&journal->j_flush_mutex); |
| return ret; |
| } |
| |
| /* |
| * for o_sync and fsync heavy applications, they tend to use |
| * all the journa list slots with tiny transactions. These |
| * trigger lots and lots of calls to update the header block, which |
| * adds seeks and slows things down. |
| * |
| * This function tries to clear out a large chunk of the journal lists |
| * at once, which makes everything faster since only the newest journal |
| * list updates the header block |
| */ |
| static int flush_used_journal_lists(struct super_block *s, |
| struct reiserfs_journal_list *jl) |
| { |
| unsigned long len = 0; |
| unsigned long cur_len; |
| int ret; |
| int i; |
| int limit = 256; |
| struct reiserfs_journal_list *tjl; |
| struct reiserfs_journal_list *flush_jl; |
| unsigned int trans_id; |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| |
| flush_jl = tjl = jl; |
| |
| /* in data logging mode, try harder to flush a lot of blocks */ |
| if (reiserfs_data_log(s)) |
| limit = 1024; |
| /* flush for 256 transactions or limit blocks, whichever comes first */ |
| for (i = 0; i < 256 && len < limit; i++) { |
| if (atomic_read(&tjl->j_commit_left) || |
| tjl->j_trans_id < jl->j_trans_id) { |
| break; |
| } |
| cur_len = atomic_read(&tjl->j_nonzerolen); |
| if (cur_len > 0) { |
| tjl->j_state &= ~LIST_TOUCHED; |
| } |
| len += cur_len; |
| flush_jl = tjl; |
| if (tjl->j_list.next == &journal->j_journal_list) |
| break; |
| tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); |
| } |
| get_journal_list(jl); |
| get_journal_list(flush_jl); |
| |
| /* |
| * try to find a group of blocks we can flush across all the |
| * transactions, but only bother if we've actually spanned |
| * across multiple lists |
| */ |
| if (flush_jl != jl) { |
| ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i); |
| } |
| flush_journal_list(s, flush_jl, 1); |
| put_journal_list(s, flush_jl); |
| put_journal_list(s, jl); |
| return 0; |
| } |
| |
| /* |
| * removes any nodes in table with name block and dev as bh. |
| * only touchs the hnext and hprev pointers. |
| */ |
| void remove_journal_hash(struct super_block *sb, |
| struct reiserfs_journal_cnode **table, |
| struct reiserfs_journal_list *jl, |
| unsigned long block, int remove_freed) |
| { |
| struct reiserfs_journal_cnode *cur; |
| struct reiserfs_journal_cnode **head; |
| |
| head = &(journal_hash(table, sb, block)); |
| if (!head) { |
| return; |
| } |
| cur = *head; |
| while (cur) { |
| if (cur->blocknr == block && cur->sb == sb |
| && (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->sb = NULL; |
| cur->state = 0; |
| /* |
| * anybody who clears the cur->bh will also |
| * dec the nonzerolen |
| */ |
| if (cur->bh && cur->jlist) |
| atomic_dec(&cur->jlist->j_nonzerolen); |
| cur->bh = NULL; |
| cur->jlist = NULL; |
| } |
| cur = cur->hnext; |
| } |
| } |
| |
| static void free_journal_ram(struct super_block *sb) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| kfree(journal->j_current_jl); |
| journal->j_num_lists--; |
| |
| vfree(journal->j_cnode_free_orig); |
| free_list_bitmaps(sb, journal->j_list_bitmap); |
| free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ |
| if (journal->j_header_bh) { |
| brelse(journal->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(sb, journal); |
| vfree(journal); |
| } |
| |
| /* |
| * 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 *sb, int error) |
| { |
| struct reiserfs_transaction_handle myth; |
| int flushed = 0; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| |
| /* |
| * we only want to flush out transactions if we were |
| * called with error == 0 |
| */ |
| if (!error && !sb_rdonly(sb)) { |
| /* end the current trans */ |
| BUG_ON(!th->t_trans_id); |
| do_journal_end(th, FLUSH_ALL); |
| |
| /* |
| * make sure something gets logged to force |
| * our way into the flush code |
| */ |
| if (!journal_join(&myth, sb)) { |
| reiserfs_prepare_for_journal(sb, |
| SB_BUFFER_WITH_SB(sb), |
| 1); |
| journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); |
| do_journal_end(&myth, FLUSH_ALL); |
| flushed = 1; |
| } |
| } |
| |
| /* this also catches errors during the do_journal_end above */ |
| if (!error && reiserfs_is_journal_aborted(journal)) { |
| memset(&myth, 0, sizeof(myth)); |
| if (!journal_join_abort(&myth, sb)) { |
| reiserfs_prepare_for_journal(sb, |
| SB_BUFFER_WITH_SB(sb), |
| 1); |
| journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); |
| do_journal_end(&myth, FLUSH_ALL); |
| } |
| } |
| |
| |
| /* |
| * We must release the write lock here because |
| * the workqueue job (flush_async_commit) needs this lock |
| */ |
| reiserfs_write_unlock(sb); |
| |
| /* |
| * Cancel flushing of old commits. Note that neither of these works |
| * will be requeued because superblock is being shutdown and doesn't |
| * have MS_ACTIVE set. |
| */ |
| reiserfs_cancel_old_flush(sb); |
| /* wait for all commits to finish */ |
| cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work); |
| |
| free_journal_ram(sb); |
| |
| reiserfs_write_lock(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 *sb) |
| { |
| return do_journal_release(th, sb, 0); |
| } |
| |
| /* only call from an error condition inside reiserfs_read_super! */ |
| int journal_release_error(struct reiserfs_transaction_handle *th, |
| struct super_block *sb) |
| { |
| return do_journal_release(th, 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 *sb, |
| struct reiserfs_journal_desc *desc, |
| struct reiserfs_journal_commit *commit) |
| { |
| if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || |
| get_commit_trans_len(commit) != get_desc_trans_len(desc) || |
| get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || |
| get_commit_trans_len(commit) <= 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 |
| * NOTE: only called during fs mount |
| */ |
| static int journal_transaction_is_valid(struct super_block *sb, |
| struct buffer_head *d_bh, |
| unsigned int *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 (get_desc_trans_len(desc) > 0 |
| && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { |
| if (oldest_invalid_trans_id && *oldest_invalid_trans_id |
| && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-986: transaction " |
| "is valid returning because trans_id %d is greater than " |
| "oldest_invalid %lu", |
| get_desc_trans_id(desc), |
| *oldest_invalid_trans_id); |
| return 0; |
| } |
| if (newest_mount_id |
| && *newest_mount_id > get_desc_mount_id(desc)) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1087: transaction " |
| "is valid returning because mount_id %d is less than " |
| "newest_mount_id %lu", |
| get_desc_mount_id(desc), |
| *newest_mount_id); |
| return -1; |
| } |
| if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { |
| reiserfs_warning(sb, "journal-2018", |
| "Bad transaction length %d " |
| "encountered, ignoring transaction", |
| get_desc_trans_len(desc)); |
| return -1; |
| } |
| offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); |
| |
| /* |
| * ok, we have a journal description block, |
| * let's see if the transaction was valid |
| */ |
| c_bh = |
| journal_bread(sb, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| ((offset + get_desc_trans_len(desc) + |
| 1) % SB_ONDISK_JOURNAL_SIZE(sb))); |
| if (!c_bh) |
| return 0; |
| commit = (struct reiserfs_journal_commit *)c_bh->b_data; |
| if (journal_compare_desc_commit(sb, desc, commit)) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal_transaction_is_valid, commit offset %ld had bad " |
| "time %d or length %d", |
| c_bh->b_blocknr - |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| get_commit_trans_id(commit), |
| get_commit_trans_len(commit)); |
| brelse(c_bh); |
| if (oldest_invalid_trans_id) { |
| *oldest_invalid_trans_id = |
| get_desc_trans_id(desc); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1004: " |
| "transaction_is_valid setting oldest invalid trans_id " |
| "to %d", |
| get_desc_trans_id(desc)); |
| } |
| return -1; |
| } |
| brelse(c_bh); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1006: found valid " |
| "transaction start offset %llu, len %d id %d", |
| d_bh->b_blocknr - |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| get_desc_trans_len(desc), |
| get_desc_trans_id(desc)); |
| 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. |
| * NOTE: only called during fs mount |
| */ |
| static int journal_read_transaction(struct super_block *sb, |
| unsigned long cur_dblock, |
| unsigned long oldest_start, |
| unsigned int oldest_trans_id, |
| unsigned long newest_mount_id) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_journal_desc *desc; |
| struct reiserfs_journal_commit *commit; |
| unsigned int 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 int trans_offset; |
| int i; |
| int trans_half; |
| |
| d_bh = journal_bread(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(sb); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " |
| "journal_read_transaction, offset %llu, len %d mount_id %d", |
| d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| get_desc_trans_len(desc), get_desc_mount_id(desc)); |
| if (get_desc_trans_id(desc) < oldest_trans_id) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " |
| "journal_read_trans skipping because %lu is too old", |
| cur_dblock - |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb)); |
| brelse(d_bh); |
| return 1; |
| } |
| if (get_desc_mount_id(desc) != newest_mount_id) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " |
| "journal_read_trans skipping because %d is != " |
| "newest_mount_id %lu", get_desc_mount_id(desc), |
| newest_mount_id); |
| brelse(d_bh); |
| return 1; |
| } |
| c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| ((trans_offset + get_desc_trans_len(desc) + 1) % |
| SB_ONDISK_JOURNAL_SIZE(sb))); |
| if (!c_bh) { |
| brelse(d_bh); |
| return 1; |
| } |
| commit = (struct reiserfs_journal_commit *)c_bh->b_data; |
| if (journal_compare_desc_commit(sb, desc, commit)) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal_read_transaction, " |
| "commit offset %llu had bad time %d or length %d", |
| c_bh->b_blocknr - |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| get_commit_trans_id(commit), |
| get_commit_trans_len(commit)); |
| brelse(c_bh); |
| brelse(d_bh); |
| return 1; |
| } |
| |
| if (bdev_read_only(sb->s_bdev)) { |
| reiserfs_warning(sb, "clm-2076", |
| "device is readonly, unable to replay log"); |
| brelse(c_bh); |
| brelse(d_bh); |
| return -EROFS; |
| } |
| |
| trans_id = get_desc_trans_id(desc); |
| /* |
| * now we know we've got a good transaction, and it was |
| * inside the valid time ranges |
| */ |
| log_blocks = kmalloc(get_desc_trans_len(desc) * |
| sizeof(struct buffer_head *), GFP_NOFS); |
| real_blocks = kmalloc(get_desc_trans_len(desc) * |
| sizeof(struct buffer_head *), GFP_NOFS); |
| if (!log_blocks || !real_blocks) { |
| brelse(c_bh); |
| brelse(d_bh); |
| kfree(log_blocks); |
| kfree(real_blocks); |
| reiserfs_warning(sb, "journal-1169", |
| "kmalloc failed, unable to mount FS"); |
| return -1; |
| } |
| /* get all the buffer heads */ |
| trans_half = journal_trans_half(sb->s_blocksize); |
| for (i = 0; i < get_desc_trans_len(desc); i++) { |
| log_blocks[i] = |
| journal_getblk(sb, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| (trans_offset + 1 + |
| i) % SB_ONDISK_JOURNAL_SIZE(sb)); |
| if (i < trans_half) { |
| real_blocks[i] = |
| sb_getblk(sb, |
| le32_to_cpu(desc->j_realblock[i])); |
| } else { |
| real_blocks[i] = |
| sb_getblk(sb, |
| le32_to_cpu(commit-> |
| j_realblock[i - trans_half])); |
| } |
| if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { |
| reiserfs_warning(sb, "journal-1207", |
| "REPLAY FAILURE fsck required! " |
| "Block to replay is outside of " |
| "filesystem"); |
| goto abort_replay; |
| } |
| /* make sure we don't try to replay onto log or reserved area */ |
| if (is_block_in_log_or_reserved_area |
| (sb, real_blocks[i]->b_blocknr)) { |
| reiserfs_warning(sb, "journal-1204", |
| "REPLAY FAILURE fsck required! " |
| "Trying to replay onto a log block"); |
| abort_replay: |
| brelse_array(log_blocks, i); |
| brelse_array(real_blocks, i); |
| brelse(c_bh); |
| brelse(d_bh); |
| kfree(log_blocks); |
| kfree(real_blocks); |
| return -1; |
| } |
| } |
| /* read in the log blocks, memcpy to the corresponding real block */ |
| ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks); |
| for (i = 0; i < get_desc_trans_len(desc); i++) { |
| |
| wait_on_buffer(log_blocks[i]); |
| if (!buffer_uptodate(log_blocks[i])) { |
| reiserfs_warning(sb, "journal-1212", |
| "REPLAY FAILURE fsck required! " |
| "buffer write failed"); |
| brelse_array(log_blocks + i, |
| get_desc_trans_len(desc) - i); |
| brelse_array(real_blocks, get_desc_trans_len(desc)); |
| brelse(c_bh); |
| brelse(d_bh); |
| kfree(log_blocks); |
| kfree(real_blocks); |
| return -1; |
| } |
| memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, |
| real_blocks[i]->b_size); |
| set_buffer_uptodate(real_blocks[i]); |
| brelse(log_blocks[i]); |
| } |
| /* flush out the real blocks */ |
| for (i = 0; i < get_desc_trans_len(desc); i++) { |
| set_buffer_dirty(real_blocks[i]); |
| write_dirty_buffer(real_blocks[i], 0); |
| } |
| for (i = 0; i < get_desc_trans_len(desc); i++) { |
| wait_on_buffer(real_blocks[i]); |
| if (!buffer_uptodate(real_blocks[i])) { |
| reiserfs_warning(sb, "journal-1226", |
| "REPLAY FAILURE, fsck required! " |
| "buffer write failed"); |
| brelse_array(real_blocks + i, |
| get_desc_trans_len(desc) - i); |
| brelse(c_bh); |
| brelse(d_bh); |
| kfree(log_blocks); |
| kfree(real_blocks); |
| return -1; |
| } |
| brelse(real_blocks[i]); |
| } |
| cur_dblock = |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| ((trans_offset + get_desc_trans_len(desc) + |
| 2) % SB_ONDISK_JOURNAL_SIZE(sb)); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1095: setting journal " "start to offset %ld", |
| cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); |
| |
| /* |
| * init starting values for the first transaction, in case |
| * this is the last transaction to be replayed. |
| */ |
| journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); |
| journal->j_last_flush_trans_id = trans_id; |
| journal->j_trans_id = trans_id + 1; |
| /* check for trans_id overflow */ |
| if (journal->j_trans_id == 0) |
| journal->j_trans_id = 10; |
| brelse(c_bh); |
| brelse(d_bh); |
| kfree(log_blocks); |
| kfree(real_blocks); |
| return 0; |
| } |
| |
| /* |
| * This function reads blocks starting from block and to max_block of bufsize |
| * size (but no more than BUFNR blocks at a time). This proved to improve |
| * mounting speed on self-rebuilding raid5 arrays at least. |
| * Right now it is only used from journal code. But later we might use it |
| * from other places. |
| * Note: Do not use journal_getblk/sb_getblk functions here! |
| */ |
| static struct buffer_head *reiserfs_breada(struct block_device *dev, |
| b_blocknr_t block, int bufsize, |
| b_blocknr_t 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(REQ_OP_READ, 0, 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; |
| } |
| |
| /* |
| * 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, which 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. |
| * NOTE: only called during fs mount |
| */ |
| static int journal_read(struct super_block *sb) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_journal_desc *desc; |
| unsigned int oldest_trans_id = 0; |
| unsigned int 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(sb); |
| reiserfs_info(sb, "checking transaction log (%pg)\n", |
| journal->j_dev_bd); |
| start = get_seconds(); |
| |
| /* |
| * 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 |
| */ |
| journal->j_header_bh = journal_bread(sb, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) |
| + SB_ONDISK_JOURNAL_SIZE(sb)); |
| if (!journal->j_header_bh) { |
| return 1; |
| } |
| jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); |
| if (le32_to_cpu(jh->j_first_unflushed_offset) < |
| SB_ONDISK_JOURNAL_SIZE(sb) |
| && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { |
| oldest_start = |
| SB_ONDISK_JOURNAL_1st_BLOCK(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(sb, REISERFS_DEBUG_CODE, |
| "journal-1153: found in " |
| "header: first_unflushed_offset %d, last_flushed_trans_id " |
| "%lu", 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(sb, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| le32_to_cpu(jh->j_first_unflushed_offset)); |
| ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); |
| if (!ret) { |
| continue_replay = 0; |
| } |
| brelse(d_bh); |
| goto start_log_replay; |
| } |
| |
| /* |
| * 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(sb) + |
| SB_ONDISK_JOURNAL_SIZE(sb))) { |
| /* |
| * Note that it is required for blocksize of primary fs |
| * device and journal device to be the same |
| */ |
| d_bh = |
| reiserfs_breada(journal->j_dev_bd, cur_dblock, |
| sb->s_blocksize, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| SB_ONDISK_JOURNAL_SIZE(sb)); |
| ret = |
| journal_transaction_is_valid(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 = get_desc_trans_id(desc); |
| oldest_start = d_bh->b_blocknr; |
| newest_mount_id = get_desc_mount_id(desc); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1179: Setting " |
| "oldest_start to offset %llu, trans_id %lu", |
| oldest_start - |
| SB_ONDISK_JOURNAL_1st_BLOCK |
| (sb), oldest_trans_id); |
| } else if (oldest_trans_id > get_desc_trans_id(desc)) { |
| /* one we just read was older */ |
| oldest_trans_id = get_desc_trans_id(desc); |
| oldest_start = d_bh->b_blocknr; |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1180: Resetting " |
| "oldest_start to offset %lu, trans_id %lu", |
| oldest_start - |
| SB_ONDISK_JOURNAL_1st_BLOCK |
| (sb), oldest_trans_id); |
| } |
| if (newest_mount_id < get_desc_mount_id(desc)) { |
| newest_mount_id = get_desc_mount_id(desc); |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1299: Setting " |
| "newest_mount_id to %d", |
| get_desc_mount_id(desc)); |
| } |
| cur_dblock += get_desc_trans_len(desc) + 2; |
| } else { |
| cur_dblock++; |
| } |
| brelse(d_bh); |
| } |
| |
| start_log_replay: |
| cur_dblock = oldest_start; |
| if (oldest_trans_id) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1206: Starting replay " |
| "from offset %llu, trans_id %lu", |
| cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| oldest_trans_id); |
| |
| } |
| replay_count = 0; |
| while (continue_replay && oldest_trans_id > 0) { |
| ret = |
| journal_read_transaction(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(sb) + journal->j_start; |
| replay_count++; |
| if (cur_dblock == oldest_start) |
| break; |
| } |
| |
| if (oldest_trans_id == 0) { |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, |
| "journal-1225: No valid " "transactions found"); |
| } |
| /* |
| * 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) { |
| journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); |
| journal->j_trans_id = |
| le32_to_cpu(jh->j_last_flush_trans_id) + 1; |
| /* check for trans_id overflow */ |
| if (journal->j_trans_id == 0) |
| journal->j_trans_id = 10; |
| journal->j_last_flush_trans_id = |
| le32_to_cpu(jh->j_last_flush_trans_id); |
| journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; |
| } else { |
| journal->j_mount_id = newest_mount_id + 1; |
| } |
| reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " |
| "newest_mount_id to %lu", journal->j_mount_id); |
| journal->j_first_unflushed_offset = journal->j_start; |
| if (replay_count > 0) { |
| reiserfs_info(sb, |
| "replayed %d transactions in %lu seconds\n", |
| replay_count, get_seconds() - start); |
| } |
| /* needed to satisfy the locking in _update_journal_header_block */ |
| reiserfs_write_lock(sb); |
| if (!bdev_read_only(sb->s_bdev) && |
| _update_journal_header_block(sb, journal->j_start, |
| journal->j_last_flush_trans_id)) { |
| reiserfs_write_unlock(sb); |
| /* |
| * replay failed, caller must call free_journal_ram and abort |
| * the mount |
| */ |
| return -1; |
| } |
| reiserfs_write_unlock(sb); |
| return 0; |
| } |
| |
| static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) |
| { |
| struct reiserfs_journal_list *jl; |
| jl = kzalloc(sizeof(struct reiserfs_journal_list), |
| GFP_NOFS | __GFP_NOFAIL); |
| INIT_LIST_HEAD(&jl->j_list); |
| INIT_LIST_HEAD(&jl->j_working_list); |
| INIT_LIST_HEAD(&jl->j_tail_bh_list); |
| INIT_LIST_HEAD(&jl->j_bh_list); |
| mutex_init(&jl->j_commit_mutex); |
| SB_JOURNAL(s)->j_num_lists++; |
| get_journal_list(jl); |
| return jl; |
| } |
| |
| static void journal_list_init(struct super_block *sb) |
| { |
| SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); |
| } |
| |
| static void release_journal_dev(struct super_block *super, |
| struct reiserfs_journal *journal) |
| { |
| if (journal->j_dev_bd != NULL) { |
| blkdev_put(journal->j_dev_bd, journal->j_dev_mode); |
| journal->j_dev_bd = NULL; |
| } |
| } |
| |
| static int journal_init_dev(struct super_block *super, |
| struct reiserfs_journal *journal, |
| const char *jdev_name) |
| { |
| int result; |
| dev_t jdev; |
| fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL; |
| char b[BDEVNAME_SIZE]; |
| |
| result = 0; |
| |
| journal->j_dev_bd = NULL; |
| jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? |
| new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; |
| |
| if (bdev_read_only(super->s_bdev)) |
| blkdev_mode = FMODE_READ; |
| |
| /* there is no "jdev" option and journal is on separate device */ |
| if ((!jdev_name || !jdev_name[0])) { |
| if (jdev == super->s_dev) |
| blkdev_mode &= ~FMODE_EXCL; |
| journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode, |
| journal); |
| journal->j_dev_mode = blkdev_mode; |
| if (IS_ERR(journal->j_dev_bd)) { |
| result = PTR_ERR(journal->j_dev_bd); |
| journal->j_dev_bd = NULL; |
| reiserfs_warning(super, "sh-458", |
| "cannot init journal device '%s': %i", |
| __bdevname(jdev, b), result); |
| return result; |
| } else if (jdev != super->s_dev) |
| set_blocksize(journal->j_dev_bd, super->s_blocksize); |
| |
| return 0; |
| } |
| |
| journal->j_dev_mode = blkdev_mode; |
| journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal); |
| if (IS_ERR(journal->j_dev_bd)) { |
| result = PTR_ERR(journal->j_dev_bd); |
| journal->j_dev_bd = NULL; |
| reiserfs_warning(super, |
| "journal_init_dev: Cannot open '%s': %i", |
| jdev_name, result); |
| return result; |
| } |
| |
| set_blocksize(journal->j_dev_bd, super->s_blocksize); |
| reiserfs_info(super, |
| "journal_init_dev: journal device: %pg\n", |
| journal->j_dev_bd); |
| return 0; |
| } |
| |
| /* |
| * When creating/tuning a file system user can assign some |
| * journal params within boundaries which depend on the ratio |
| * blocksize/standard_blocksize. |
| * |
| * For blocks >= standard_blocksize transaction size should |
| * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more |
| * then JOURNAL_TRANS_MAX_DEFAULT. |
| * |
| * For blocks < standard_blocksize these boundaries should be |
| * decreased proportionally. |
| */ |
| #define REISERFS_STANDARD_BLKSIZE (4096) |
| |
| static int check_advise_trans_params(struct super_block *sb, |
| struct reiserfs_journal *journal) |
| { |
| if (journal->j_trans_max) { |
| /* Non-default journal params. Do sanity check for them. */ |
| int ratio = 1; |
| if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) |
| ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; |
| |
| if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || |
| journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || |
| SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < |
| JOURNAL_MIN_RATIO) { |
| reiserfs_warning(sb, "sh-462", |
| "bad transaction max size (%u). " |
| "FSCK?", journal->j_trans_max); |
| return 1; |
| } |
| if (journal->j_max_batch != (journal->j_trans_max) * |
| JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { |
| reiserfs_warning(sb, "sh-463", |
| "bad transaction max batch (%u). " |
| "FSCK?", journal->j_max_batch); |
| return 1; |
| } |
| } else { |
| /* |
| * Default journal params. |
| * The file system was created by old version |
| * of mkreiserfs, so some fields contain zeros, |
| * and we need to advise proper values for them |
| */ |
| if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { |
| reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", |
| sb->s_blocksize); |
| return 1; |
| } |
| journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; |
| journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; |
| journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; |
| } |
| return 0; |
| } |
| |
| /* must be called once on fs mount. calls journal_read for you */ |
| int journal_init(struct super_block *sb, const char *j_dev_name, |
| int old_format, unsigned int commit_max_age) |
| { |
| int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; |
| struct buffer_head *bhjh; |
| struct reiserfs_super_block *rs; |
| struct reiserfs_journal_header *jh; |
| struct reiserfs_journal *journal; |
| struct reiserfs_journal_list *jl; |
| int ret; |
| |
| journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal)); |
| if (!journal) { |
| reiserfs_warning(sb, "journal-1256", |
| "unable to get memory for journal structure"); |
| return 1; |
| } |
| INIT_LIST_HEAD(&journal->j_bitmap_nodes); |
| INIT_LIST_HEAD(&journal->j_prealloc_list); |
| INIT_LIST_HEAD(&journal->j_working_list); |
| INIT_LIST_HEAD(&journal->j_journal_list); |
| journal->j_persistent_trans = 0; |
| if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, |
| reiserfs_bmap_count(sb))) |
| goto free_and_return; |
| |
| allocate_bitmap_nodes(sb); |
| |
| /* reserved for journal area support */ |
| SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? |
| REISERFS_OLD_DISK_OFFSET_IN_BYTES |
| / sb->s_blocksize + |
| reiserfs_bmap_count(sb) + |
| 1 : |
| REISERFS_DISK_OFFSET_IN_BYTES / |
| sb->s_blocksize + 2); |
| |
| /* |
| * Sanity check to see is the standard journal fitting |
| * within first bitmap (actual for small blocksizes) |
| */ |
| if (!SB_ONDISK_JOURNAL_DEVICE(sb) && |
| (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + |
| SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { |
| reiserfs_warning(sb, "journal-1393", |
| "journal does not fit for area addressed " |
| "by first of bitmap blocks. It starts at " |
| "%u and its size is %u. Block size %ld", |
| SB_JOURNAL_1st_RESERVED_BLOCK(sb), |
| SB_ONDISK_JOURNAL_SIZE(sb), |
| sb->s_blocksize); |
| goto free_and_return; |
| } |
| |
| if (journal_init_dev(sb, journal, j_dev_name) != 0) { |
| reiserfs_warning(sb, "sh-462", |
| "unable to initialize journal device"); |
| goto free_and_return; |
| } |
| |
| rs = SB_DISK_SUPER_BLOCK(sb); |
| |
| /* read journal header */ |
| bhjh = journal_bread(sb, |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb) + |
| SB_ONDISK_JOURNAL_SIZE(sb)); |
| if (!bhjh) { |
| reiserfs_warning(sb, "sh-459", |
| "unable to read journal header"); |
| 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) |
| && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != |
| sb_jp_journal_magic(rs))) { |
| reiserfs_warning(sb, "sh-460", |
| "journal header magic %x (device %pg) does " |
| "not match to magic found in super block %x", |
| jh->jh_journal.jp_journal_magic, |
| journal->j_dev_bd, |
| sb_jp_journal_magic(rs)); |
| brelse(bhjh); |
| goto free_and_return; |
| } |
| |
| journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); |
| journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); |
| journal->j_max_commit_age = |
| le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); |
| journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; |
| |
| if (check_advise_trans_params(sb, journal) != 0) |
| goto free_and_return; |
| journal->j_default_max_commit_age = journal->j_max_commit_age; |
| |
| if (commit_max_age != 0) { |
| journal->j_max_commit_age = commit_max_age; |
| journal->j_max_trans_age = commit_max_age; |
| } |
| |
| reiserfs_info(sb, "journal params: device %pg, size %u, " |
| "journal first block %u, max trans len %u, max batch %u, " |
| "max commit age %u, max trans age %u\n", |
| journal->j_dev_bd, |
| SB_ONDISK_JOURNAL_SIZE(sb), |
| SB_ONDISK_JOURNAL_1st_BLOCK(sb), |
| journal->j_trans_max, |
| journal->j_max_batch, |
| journal->j_max_commit_age, journal->j_max_trans_age); |
| |
| brelse(bhjh); |
| |
| journal->j_list_bitmap_index = 0; |
| journal_list_init(sb); |
| |
| memset(journal->j_list_hash_table, 0, |
| JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); |
| |
| INIT_LIST_HEAD(&journal->j_dirty_buffers); |
| spin_lock_init(&journal->j_dirty_buffers_lock); |
| |
| journal->j_start = 0; |
| journal->j_len = 0; |
| journal->j_len_alloc = 0; |
| atomic_set(&journal->j_wcount, 0); |
| atomic_set(&journal->j_async_throttle, 0); |
| journal->j_bcount = 0; |
| journal->j_trans_start_time = 0; |
| journal->j_last = NULL; |
| journal->j_first = NULL; |
| init_waitqueue_head(&journal->j_join_wait); |
| mutex_init(&journal->j_mutex); |
| mutex_init(&journal->j_flush_mutex); |
| |
| journal->j_trans_id = 10; |
| journal->j_mount_id = 10; |
| journal->j_state = 0; |
| atomic_set(&journal->j_jlock, 0); |
| journal->j_cnode_free_list = allocate_cnodes(num_cnodes); |
| journal->j_cnode_free_orig = journal->j_cnode_free_list; |
| journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; |
| journal->j_cnode_used = 0; |
| journal->j_must_wait = 0; |
| |
| if (journal->j_cnode_free == 0) { |
| reiserfs_warning(sb, "journal-2004", "Journal cnode memory " |
| "allocation failed (%ld bytes). Journal is " |
| "too large for available memory. Usually " |
| "this is due to a journal that is too large.", |
| sizeof (struct reiserfs_journal_cnode) * num_cnodes); |
| goto free_and_return; |
| } |
| |
| init_journal_hash(sb); |
| jl = journal->j_current_jl; |
| |
| /* |
| * get_list_bitmap() may call flush_commit_list() which |
| * requires the lock. Calling flush_commit_list() shouldn't happen |
| * this early but I like to be paranoid. |
| */ |
| reiserfs_write_lock(sb); |
| jl->j_list_bitmap = get_list_bitmap(sb, jl); |
| reiserfs_write_unlock(sb); |
| if (!jl->j_list_bitmap) { |
| reiserfs_warning(sb, "journal-2005", |
| "get_list_bitmap failed for journal list 0"); |
| goto free_and_return; |
| } |
| |
| ret = journal_read(sb); |
| if (ret < 0) { |
| reiserfs_warning(sb, "reiserfs-2006", |
| "Replay Failure, unable to mount"); |
| goto free_and_return; |
| } |
| |
| INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); |
| journal->j_work_sb = sb; |
| return 0; |
| free_and_return: |
| free_journal_ram(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) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); |
| time_t now = get_seconds(); |
| /* cannot restart while nested */ |
| BUG_ON(!th->t_trans_id); |
| if (th->t_refcount > 1) |
| return 0; |
| if (journal->j_must_wait > 0 || |
| (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || |
| atomic_read(&journal->j_jlock) || |
| (now - journal->j_trans_start_time) > journal->j_max_trans_age || |
| journal->j_cnode_free < (journal->j_trans_max * 3)) { |
| return 1; |
| } |
| |
| journal->j_len_alloc += new_alloc; |
| th->t_blocks_allocated += new_alloc ; |
| return 0; |
| } |
| |
| /* this must be called inside a transaction */ |
| void reiserfs_block_writes(struct reiserfs_transaction_handle *th) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); |
| BUG_ON(!th->t_trans_id); |
| journal->j_must_wait = 1; |
| set_bit(J_WRITERS_BLOCKED, &journal->j_state); |
| return; |
| } |
| |
| /* this must be called without a transaction started */ |
| void reiserfs_allow_writes(struct super_block *s) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| clear_bit(J_WRITERS_BLOCKED, &journal->j_state); |
| wake_up(&journal->j_join_wait); |
| } |
| |
| /* this must be called without a transaction started */ |
| void reiserfs_wait_on_write_block(struct super_block *s) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| wait_event(journal->j_join_wait, |
| !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); |
| } |
| |
| static void queue_log_writer(struct super_block *s) |
| { |
| wait_queue_entry_t wait; |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| set_bit(J_WRITERS_QUEUED, &journal->j_state); |
| |
| /* |
| * we don't want to use wait_event here because |
| * we only want to wait once. |
| */ |
| init_waitqueue_entry(&wait, current); |
| add_wait_queue(&journal->j_join_wait, &wait); |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { |
| int depth = reiserfs_write_unlock_nested(s); |
| schedule(); |
| reiserfs_write_lock_nested(s, depth); |
| } |
| __set_current_state(TASK_RUNNING); |
| remove_wait_queue(&journal->j_join_wait, &wait); |
| } |
| |
| static void wake_queued_writers(struct super_block *s) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(s); |
| if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) |
| wake_up(&journal->j_join_wait); |
| } |
| |
| static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) |
| { |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| unsigned long bcount = journal->j_bcount; |
| while (1) { |
| int depth; |
| |
| depth = reiserfs_write_unlock_nested(sb); |
| schedule_timeout_uninterruptible(1); |
| reiserfs_write_lock_nested(sb, depth); |
| |
| journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; |
| while ((atomic_read(&journal->j_wcount) > 0 || |
| atomic_read(&journal->j_jlock)) && |
| journal->j_trans_id == trans_id) { |
| queue_log_writer(sb); |
| } |
| if (journal->j_trans_id != trans_id) |
| break; |
| if (bcount == journal->j_bcount) |
| break; |
| bcount = journal->j_bcount; |
| } |
| } |
| |
| /* |
| * 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 *sb, unsigned long nblocks, |
| int join) |
| { |
| time_t now = get_seconds(); |
| unsigned int old_trans_id; |
| struct reiserfs_journal *journal = SB_JOURNAL(sb); |
| struct reiserfs_transaction_handle myth; |
| int sched_count = 0; |
| int retval; |
| int depth; |
| |
| reiserfs_check_lock_depth(sb, "journal_begin"); |
| BUG_ON(nblocks > journal->j_trans_max); |
| |
| PROC_INFO_INC(sb, journal.journal_being); |
| /* set here for journal_join */ |
| th->t_refcount = 1; |
| th->t_super = sb; |
| |
| relock: |
| lock_journal(sb); |
| if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { |
| unlock_journal(sb); |
| retval = journal->j_errno; |
| goto out_fail; |
| } |
| journal->j_bcount++; |
| |
| if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { |
| unlock_journal(sb); |
| depth = reiserfs_write_unlock_nested(sb); |
| reiserfs_wait_on_write_block(sb); |
| reiserfs_write_lock_nested(sb, depth); |
| PROC_INFO_INC(sb, journal.journal_relock_writers); |
| goto relock; |
| } |
| now = get_seconds(); |
| |
| /* |
| * 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 && journal->j_must_wait > 0) || |
| (!join |
| && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) |
| || (!join && atomic_read(&journal->j_wcount) > 0 |
| && journal->j_trans_start_time > 0 |
| && (now - journal->j_trans_start_time) > |
| journal->j_max_trans_age) || (!join |
| && atomic_read(&journal->j_jlock)) |
| || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { |
| |
| old_trans_id = journal->j_trans_id; |
| /* allow others to finish this transaction */ |
| unlock_journal(sb); |
| |
| if (!join && (journal->j_len_alloc + nblocks + 2) >= |
| journal->j_max_batch && |
| ((journal->j_len + nblocks + 2) * 100) < |
| (journal->j_len_alloc * 75)) { |
| if (atomic_read(&journal->j_wcount) > 10) { |
| sched_count++; |
| queue_log_writer(sb); |
| goto relock; |
| } |
| } |
| /* |
| * don't mess with joining the transaction if all we |
| * have to do is wait for someone else to do a commit |
| */ |
| if (atomic_read(&journal->j_jlock)) { |
| while (journal->j_trans_id == old_trans_id && |
| atomic_read(&journal->j_jlock)) { |
| queue_log_writer(sb); |
| } |
| goto relock; |
| } |
| retval = journal_join(&myth, sb); |
| if (retval) |
| goto out_fail; |
| |
| /* someone might have ended the transaction while we joined */ |
| if (old_trans_id != journal->j_trans_id) { |
| retval = do_journal_end(&myth, 0); |
| } else { |
| retval = do_journal_end(&myth, COMMIT_NOW); |
| } |
|