diff options
Diffstat (limited to 'fs/reiserfs/journal.c')
| -rw-r--r-- | fs/reiserfs/journal.c | 4404 |
1 files changed, 0 insertions, 4404 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c deleted file mode 100644 index e477ee0ff35d..000000000000 --- a/fs/reiserfs/journal.c +++ /dev/null @@ -1,4404 +0,0 @@ -// 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 - * 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)) - -/* 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 reiserfs_journal *journal); -static void 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(array_size(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_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 - && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { - return 1; - } - - /* is it in the current transaction. This should never happen */ - if ((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 folio *folio = bh->b_folio; - if (!folio->mapping && folio_trylock(folio)) { - folio_get(folio); - put_bh(bh); - if (!folio->mapping) - try_to_free_buffers(folio); - folio_unlock(folio); - folio_put(folio); - } 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, 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, 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 invalidate_folio here. - * reiserfs_invalidate_folio 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_folio->mapping == NULL)) { - spin_unlock(lock); - write_dirty_buffer(bh, 0); - 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; - -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; - } - - 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); - wait_var_event_timeout(&j->j_async_throttle, - atomic_read(&j->j_async_throttle) == 0, - 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); - write_dirty_buffer(tbh, 0); - reiserfs_write_lock_nested(s, depth); - } - put_bh(tbh) ; - } - } - if (atomic_dec_and_test(&journal->j_async_throttle)) - wake_up_var(&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; - 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: - 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 void dirty_one_transaction(struct super_block *s, - struct reiserfs_journal_list *jl) -{ - struct reiserfs_journal_cnode *cn; - struct reiserfs_journal_list *pjl; - - 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; - } -} - -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 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) - 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. - */ -static 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(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; - 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); - } - } - - /* 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 SB_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_array(get_desc_trans_len(desc), - sizeof(struct buffer_head *), - GFP_NOFS); - real_blocks = kmalloc_array(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 */ - bh_read_batch(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 (!bh || 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 (!bh) - break; - if (buffer_uptodate(bh)) { - brelse(bh); - break; - } else - bhlist[j++] = bh; - } - bh = bhlist[0]; - bh_read_nowait(bh, 0); - bh_readahead_batch(j - 1, &bhlist[1], 0); - for (i = 1; i < j; i++) - brelse(bhlist[i]); - 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; - time64_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", - file_bdev(journal->j_bdev_file)); - start = ktime_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(file_bdev(journal->j_bdev_file), 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, ktime_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 reiserfs_journal *journal) -{ - if (journal->j_bdev_file) { - bdev_fput(journal->j_bdev_file); - journal->j_bdev_file = NULL; - } -} - -static int journal_init_dev(struct super_block *super, - struct reiserfs_journal *journal, - const char *jdev_name) -{ - blk_mode_t blkdev_mode = BLK_OPEN_READ; - void *holder = journal; - int result; - dev_t jdev; - - result = 0; - - journal->j_bdev_file = 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 |= BLK_OPEN_WRITE; - - /* there is no "jdev" option and journal is on separate device */ - if ((!jdev_name || !jdev_name[0])) { - if (jdev == super->s_dev) - holder = NULL; - journal->j_bdev_file = bdev_file_open_by_dev(jdev, blkdev_mode, - holder, NULL); - if (IS_ERR(journal->j_bdev_file)) { - result = PTR_ERR(journal->j_bdev_file); - journal->j_bdev_file = NULL; - reiserfs_warning(super, "sh-458", - "cannot init journal device unknown-block(%u,%u): %i", - MAJOR(jdev), MINOR(jdev), result); - return result; - } else if (jdev != super->s_dev) - set_blocksize(journal->j_bdev_file, super->s_blocksize); - - return 0; - } - - journal->j_bdev_file = bdev_file_open_by_path(jdev_name, blkdev_mode, - holder, NULL); - if (IS_ERR(journal->j_bdev_file)) { - result = PTR_ERR(journal->j_bdev_file); - journal->j_bdev_file = NULL; - reiserfs_warning(super, "sh-457", - "journal_init_dev: Cannot open '%s': %i", - jdev_name, result); - return result; - } - - set_blocksize(journal->j_bdev_file, super->s_blocksize); - reiserfs_info(super, - "journal_init_dev: journal device: %pg\n", - file_bdev(journal->j_bdev_file)); - 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; - } - - /* - * Sanity check to see if journal first block is correct. - * If journal first block is invalid it can cause - * zeroing important superblock members. - */ - if (!SB_ONDISK_JOURNAL_DEVICE(sb) && - SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) { - reiserfs_warning(sb, "journal-1393", - "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d", - SB_JOURNAL_1st_RESERVED_BLOCK(sb), - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); - 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, - file_bdev(journal->j_bdev_file), - 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", - file_bdev(journal->j_bdev_file), - 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); - time64_t now = ktime_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) -{ - time64_t now = ktime_get_seconds(); - unsigned int old_trans_id; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - struct reiserfs_transaction_handle myth; - 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 = ktime_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) { - 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); - } - - if (retval) - goto out_fail; - - PROC_INFO_INC(sb, journal.journal_relock_wcount); - goto relock; - } - /* we are the first writer, set trans_id */ - if (journal->j_trans_start_time == 0) { - journal->j_trans_start_time = ktime_get_seconds(); - } - atomic_inc(&journal->j_wcount); - journal->j_len_alloc += nblocks; - th->t_blocks_logged = 0; - th->t_blocks_allocated = nblocks; - th->t_trans_id = journal->j_trans_id; - unlock_journal(sb); - INIT_LIST_HEAD(&th->t_list); - return 0; - -out_fail: - memset(th, 0, sizeof(*th)); - /* - * Re-set th->t_super, so we can properly keep track of how many - * persistent transactions there are. We need to do this so if this - * call is part of a failed restart_transaction, we can free it later - */ - th->t_super = sb; - return retval; -} - -struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct - super_block - *s, - int nblocks) -{ - int ret; - struct reiserfs_transaction_handle *th; - - /* - * if we're nesting into an existing transaction. It will be - * persistent on its own - */ - if (reiserfs_transaction_running(s)) { - th = current->journal_info; - th->t_refcount++; - BUG_ON(th->t_refcount < 2); - - return th; - } - th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); - if (!th) - return NULL; - ret = journal_begin(th, s, nblocks); - if (ret) { - kfree(th); - return NULL; - } - - SB_JOURNAL(s)->j_persistent_trans++; - return th; -} - -int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) -{ - struct super_block *s = th->t_super; - int ret = 0; - if (th->t_trans_id) - ret = journal_end(th); - else - ret = -EIO; - if (th->t_refcount == 0) { - SB_JOURNAL(s)->j_persistent_trans--; - kfree(th); - } - return ret; -} - -static int journal_join(struct reiserfs_transaction_handle *th, - struct super_block *sb) -{ - struct reiserfs_transaction_handle *cur_th = current->journal_info; - - /* - * this keeps do_journal_end from NULLing out the - * current->journal_info pointer - */ - th->t_handle_save = cur_th; - BUG_ON(cur_th && cur_th->t_refcount > 1); - return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN); -} - -int journal_join_abort(struct reiserfs_transaction_handle *th, - struct super_block *sb) -{ - struct reiserfs_transaction_handle *cur_th = current->journal_info; - - /* - * this keeps do_journal_end from NULLing out the - * current->journal_info pointer - */ - th->t_handle_save = cur_th; - BUG_ON(cur_th && cur_th->t_refcount > 1); - return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT); -} - -int journal_begin(struct reiserfs_transaction_handle *th, - struct super_block *sb, unsigned long nblocks) -{ - struct reiserfs_transaction_handle *cur_th = current->journal_info; - int ret; - - th->t_handle_save = NULL; - if (cur_th) { - /* we are nesting into the current transaction */ - if (cur_th->t_super == sb) { - BUG_ON(!cur_th->t_refcount); - cur_th->t_refcount++; - memcpy(th, cur_th, sizeof(*th)); - if (th->t_refcount <= 1) - reiserfs_warning(sb, "reiserfs-2005", - "BAD: refcount <= 1, but " - "journal_info != 0"); - return 0; - } else { - /* - * we've ended up with a handle from a different - * filesystem. save it and restore on journal_end. - * This should never really happen... - */ - reiserfs_warning(sb, "clm-2100", - "nesting info a different FS"); - th->t_handle_save = current->journal_info; - current->journal_info = th; - } - } else { - current->journal_info = th; - } - ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); - BUG_ON(current->journal_info != th); - - /* - * I guess this boils down to being the reciprocal of clm-2100 above. - * If do_journal_begin_r fails, we need to put it back, since - * journal_end won't be called to do it. */ - if (ret) - current->journal_info = th->t_handle_save; - else - BUG_ON(!th->t_refcount); - - return ret; -} - -/* - * puts bh into the current transaction. If it was already there, reorders - * removes the old pointers from the hash, and puts new ones in (to make - * sure replay happen in the right order). - * - * if it was dirty, cleans and files onto the clean list. I can't let it - * be dirty again until the transaction is committed. - * - * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. - */ -int journal_mark_dirty(struct reiserfs_transaction_handle *th, - struct buffer_head *bh) -{ - struct super_block *sb = th->t_super; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - struct reiserfs_journal_cnode *cn = NULL; - int count_already_incd = 0; - int prepared = 0; - BUG_ON(!th->t_trans_id); - - PROC_INFO_INC(sb, journal.mark_dirty); - if (th->t_trans_id != journal->j_trans_id) { - reiserfs_panic(th->t_super, "journal-1577", - "handle trans id %ld != current trans id %ld", - th->t_trans_id, journal->j_trans_id); - } - - prepared = test_clear_buffer_journal_prepared(bh); - clear_buffer_journal_restore_dirty(bh); - /* already in this transaction, we are done */ - if (buffer_journaled(bh)) { - PROC_INFO_INC(sb, journal.mark_dirty_already); - return 0; - } - - /* - * this must be turned into a panic instead of a warning. We can't - * allow a dirty or journal_dirty or locked buffer to be logged, as - * some changes could get to disk too early. NOT GOOD. - */ - if (!prepared || buffer_dirty(bh)) { - reiserfs_warning(sb, "journal-1777", - "buffer %llu bad state " - "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", - (unsigned long long)bh->b_blocknr, - prepared ? ' ' : '!', - buffer_locked(bh) ? ' ' : '!', - buffer_dirty(bh) ? ' ' : '!', - buffer_journal_dirty(bh) ? ' ' : '!'); - } - - if (atomic_read(&journal->j_wcount) <= 0) { - reiserfs_warning(sb, "journal-1409", - "returning because j_wcount was %d", - atomic_read(&journal->j_wcount)); - return 1; - } - /* - * this error means I've screwed up, and we've overflowed - * the transaction. Nothing can be done here, except make the - * FS readonly or panic. - */ - if (journal->j_len >= journal->j_trans_max) { - reiserfs_panic(th->t_super, "journal-1413", - "j_len (%lu) is too big", - journal->j_len); - } - - if (buffer_journal_dirty(bh)) { - count_already_incd = 1; - PROC_INFO_INC(sb, journal.mark_dirty_notjournal); - clear_buffer_journal_dirty(bh); - } - - if (journal->j_len > journal->j_len_alloc) { - journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; - } - - set_buffer_journaled(bh); - - /* now put this guy on the end */ - if (!cn) { - cn = get_cnode(sb); - if (!cn) { - reiserfs_panic(sb, "journal-4", "get_cnode failed!"); - } - - if (th->t_blocks_logged == th->t_blocks_allocated) { - th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; - journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; - } - th->t_blocks_logged++; - journal->j_len++; - - cn->bh = bh; - cn->blocknr = bh->b_blocknr; - cn->sb = sb; - cn->jlist = NULL; - insert_journal_hash(journal->j_hash_table, cn); - if (!count_already_incd) { - get_bh(bh); - } - } - cn->next = NULL; - cn->prev = journal->j_last; - cn->bh = bh; - if (journal->j_last) { - journal->j_last->next = cn; - journal->j_last = cn; - } else { - journal->j_first = cn; - journal->j_last = cn; - } - reiserfs_schedule_old_flush(sb); - return 0; -} - -int journal_end(struct reiserfs_transaction_handle *th) -{ - struct super_block *sb = th->t_super; - if (!current->journal_info && th->t_refcount > 1) - reiserfs_warning(sb, "REISER-NESTING", - "th NULL, refcount %d", th->t_refcount); - - if (!th->t_trans_id) { - WARN_ON(1); - return -EIO; - } - - th->t_refcount--; - if (th->t_refcount > 0) { - struct reiserfs_transaction_handle *cur_th = - current->journal_info; - - /* - * we aren't allowed to close a nested transaction on a - * different filesystem from the one in the task struct - */ - BUG_ON(cur_th->t_super != th->t_super); - - if (th != cur_th) { - memcpy(current->journal_info, th, sizeof(*th)); - th->t_trans_id = 0; - } - return 0; - } else { - return do_journal_end(th, 0); - } -} - -/* - * removes from the current transaction, relsing and descrementing any counters. - * also files the removed buffer directly onto the clean list - * - * called by journal_mark_freed when a block has been deleted - * - * returns 1 if it cleaned and relsed the buffer. 0 otherwise - */ -static int remove_from_transaction(struct super_block *sb, - b_blocknr_t blocknr, int already_cleaned) -{ - struct buffer_head *bh; - struct reiserfs_journal_cnode *cn; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - int ret = 0; - - cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); - if (!cn || !cn->bh) { - return ret; - } - bh = cn->bh; - if (cn->prev) { - cn->prev->next = cn->next; - } - if (cn->next) { - cn->next->prev = cn->prev; - } - if (cn == journal->j_first) { - journal->j_first = cn->next; - } - if (cn == journal->j_last) { - journal->j_last = cn->prev; - } - remove_journal_hash(sb, journal->j_hash_table, NULL, - bh->b_blocknr, 0); - clear_buffer_journaled(bh); /* don't log this one */ - - if (!already_cleaned) { - clear_buffer_journal_dirty(bh); - clear_buffer_dirty(bh); - clear_buffer_journal_test(bh); - put_bh(bh); - if (atomic_read(&bh->b_count) < 0) { - reiserfs_warning(sb, "journal-1752", - "b_count < 0"); - } - ret = 1; - } - journal->j_len--; - journal->j_len_alloc--; - free_cnode(sb, cn); - return ret; -} - -/* - * for any cnode in a journal list, it can only be dirtied of all the - * transactions that include it are committed to disk. - * this checks through each transaction, and returns 1 if you are allowed - * to dirty, and 0 if you aren't - * - * it is called by dirty_journal_list, which is called after - * flush_commit_list has gotten all the log blocks for a given - * transaction on disk - * - */ -static int can_dirty(struct reiserfs_journal_cnode *cn) -{ - struct super_block *sb = cn->sb; - b_blocknr_t blocknr = cn->blocknr; - struct reiserfs_journal_cnode *cur = cn->hprev; - int can_dirty = 1; - - /* - * first test hprev. These are all newer than cn, so any node here - * with the same block number and dev means this node can't be sent - * to disk right now. - */ - while (cur && can_dirty) { - if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && - cur->blocknr == blocknr) { - can_dirty = 0; - } - cur = cur->hprev; - } - /* - * then test hnext. These are all older than cn. As long as they - * are committed to the log, it is safe to write cn to disk - */ - cur = cn->hnext; - while (cur && can_dirty) { - if (cur->jlist && cur->jlist->j_len > 0 && - atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh && - cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { - can_dirty = 0; - } - cur = cur->hnext; - } - return can_dirty; -} - -/* - * syncs the commit blocks, but does not force the real buffers to disk - * will wait until the current transaction is done/committed before returning - */ -int journal_end_sync(struct reiserfs_transaction_handle *th) -{ - struct super_block *sb = th->t_super; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - - BUG_ON(!th->t_trans_id); - /* you can sync while nested, very, very bad */ - BUG_ON(th->t_refcount > 1); - if (journal->j_len == 0) { - reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), - 1); - journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); - } - return do_journal_end(th, COMMIT_NOW | WAIT); -} - -/* writeback the pending async commits to disk */ -static void flush_async_commits(struct work_struct *work) -{ - struct reiserfs_journal *journal = - container_of(work, struct reiserfs_journal, j_work.work); - struct super_block *sb = journal->j_work_sb; - struct reiserfs_journal_list *jl; - struct list_head *entry; - - reiserfs_write_lock(sb); - if (!list_empty(&journal->j_journal_list)) { - /* last entry is the youngest, commit it and you get everything */ - entry = journal->j_journal_list.prev; - jl = JOURNAL_LIST_ENTRY(entry); - flush_commit_list(sb, jl, 1); - } - reiserfs_write_unlock(sb); -} - -/* - * flushes any old transactions to disk - * ends the current transaction if it is too old - */ -void reiserfs_flush_old_commits(struct super_block *sb) -{ - time64_t now; - struct reiserfs_transaction_handle th; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - - now = ktime_get_seconds(); - /* - * safety check so we don't flush while we are replaying the log during - * mount - */ - if (list_empty(&journal->j_journal_list)) - return; - - /* - * check the current transaction. If there are no writers, and it is - * too old, finish it, and force the commit blocks to disk - */ - if (atomic_read(&journal->j_wcount) <= 0 && - journal->j_trans_start_time > 0 && - journal->j_len > 0 && - (now - journal->j_trans_start_time) > journal->j_max_trans_age) { - if (!journal_join(&th, sb)) { - reiserfs_prepare_for_journal(sb, - SB_BUFFER_WITH_SB(sb), - 1); - journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); - - /* - * we're only being called from kreiserfsd, it makes - * no sense to do an async commit so that kreiserfsd - * can do it later - */ - do_journal_end(&th, COMMIT_NOW | WAIT); - } - } -} - -/* - * returns 0 if do_journal_end should return right away, returns 1 if - * do_journal_end should finish the commit - * - * if the current transaction is too old, but still has writers, this will - * wait on j_join_wait until all the writers are done. By the time it - * wakes up, the transaction it was called has already ended, so it just - * flushes the commit list and returns 0. - * - * Won't batch when flush or commit_now is set. Also won't batch when - * others are waiting on j_join_wait. - * - * Note, we can't allow the journal_end to proceed while there are still - * writers in the log. - */ -static int check_journal_end(struct reiserfs_transaction_handle *th, int flags) -{ - - time64_t now; - int flush = flags & FLUSH_ALL; - int commit_now = flags & COMMIT_NOW; - int wait_on_commit = flags & WAIT; - struct reiserfs_journal_list *jl; - struct super_block *sb = th->t_super; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - - BUG_ON(!th->t_trans_id); - - if (th->t_trans_id != journal->j_trans_id) { - reiserfs_panic(th->t_super, "journal-1577", - "handle trans id %ld != current trans id %ld", - th->t_trans_id, journal->j_trans_id); - } - - journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); - /* <= 0 is allowed. unmounting might not call begin */ - if (atomic_read(&journal->j_wcount) > 0) - atomic_dec(&journal->j_wcount); - - /* - * BUG, deal with case where j_len is 0, but people previously - * freed blocks need to be released will be dealt with by next - * transaction that actually writes something, but should be taken - * care of in this trans - */ - BUG_ON(journal->j_len == 0); - - /* - * if wcount > 0, and we are called to with flush or commit_now, - * we wait on j_join_wait. We will wake up when the last writer has - * finished the transaction, and started it on its way to the disk. - * Then, we flush the commit or journal list, and just return 0 - * because the rest of journal end was already done for this - * transaction. - */ - if (atomic_read(&journal->j_wcount) > 0) { - if (flush || commit_now) { - unsigned trans_id; - - jl = journal->j_current_jl; - trans_id = jl->j_trans_id; - if (wait_on_commit) - jl->j_state |= LIST_COMMIT_PENDING; - atomic_set(&journal->j_jlock, 1); - if (flush) { - journal->j_next_full_flush = 1; - } - unlock_journal(sb); - - /* - * sleep while the current transaction is - * still j_jlocked - */ - while (journal->j_trans_id == trans_id) { - if (atomic_read(&journal->j_jlock)) { - queue_log_writer(sb); - } else { - lock_journal(sb); - if (journal->j_trans_id == trans_id) { - atomic_set(&journal->j_jlock, - 1); - } - unlock_journal(sb); - } - } - BUG_ON(journal->j_trans_id == trans_id); - - if (commit_now - && journal_list_still_alive(sb, trans_id) - && wait_on_commit) { - flush_commit_list(sb, jl, 1); - } - return 0; - } - unlock_journal(sb); - return 0; - } - - /* deal with old transactions where we are the last writers */ - now = ktime_get_seconds(); - if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { - commit_now = 1; - journal->j_next_async_flush = 1; - } - /* don't batch when someone is waiting on j_join_wait */ - /* don't batch when syncing the commit or flushing the whole trans */ - if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock)) - && !flush && !commit_now && (journal->j_len < journal->j_max_batch) - && journal->j_len_alloc < journal->j_max_batch - && journal->j_cnode_free > (journal->j_trans_max * 3)) { - journal->j_bcount++; - unlock_journal(sb); - return 0; - } - - if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { - reiserfs_panic(sb, "journal-003", - "j_start (%ld) is too high", - journal->j_start); - } - return 1; -} - -/* - * Does all the work that makes deleting blocks safe. - * when deleting a block mark BH_JNew, just remove it from the current - * transaction, clean it's buffer_head and move on. - * - * otherwise: - * set a bit for the block in the journal bitmap. That will prevent it from - * being allocated for unformatted nodes before this transaction has finished. - * - * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. - * That will prevent any old transactions with this block from trying to flush - * to the real location. Since we aren't removing the cnode from the - * journal_list_hash, *the block can't be reallocated yet. - * - * Then remove it from the current transaction, decrementing any counters and - * filing it on the clean list. - */ -int journal_mark_freed(struct reiserfs_transaction_handle *th, - struct super_block *sb, b_blocknr_t blocknr) -{ - struct reiserfs_journal *journal = SB_JOURNAL(sb); - struct reiserfs_journal_cnode *cn = NULL; - struct buffer_head *bh = NULL; - struct reiserfs_list_bitmap *jb = NULL; - int cleaned = 0; - BUG_ON(!th->t_trans_id); - - cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); - if (cn && cn->bh) { - bh = cn->bh; - get_bh(bh); - } - /* if it is journal new, we just remove it from this transaction */ - if (bh && buffer_journal_new(bh)) { - clear_buffer_journal_new(bh); - clear_prepared_bits(bh); - reiserfs_clean_and_file_buffer(bh); - cleaned = remove_from_transaction(sb, blocknr, cleaned); - } else { - /* - * set the bit for this block in the journal bitmap - * for this transaction - */ - jb = journal->j_current_jl->j_list_bitmap; - if (!jb) { - reiserfs_panic(sb, "journal-1702", - "journal_list_bitmap is NULL"); - } - set_bit_in_list_bitmap(sb, blocknr, jb); - - /* Note, the entire while loop is not allowed to schedule. */ - - if (bh) { - clear_prepared_bits(bh); - reiserfs_clean_and_file_buffer(bh); - } - cleaned = remove_from_transaction(sb, blocknr, cleaned); - - /* - * find all older transactions with this block, - * make sure they don't try to write it out - */ - cn = get_journal_hash_dev(sb, journal->j_list_hash_table, - blocknr); - while (cn) { - if (sb == cn->sb && blocknr == cn->blocknr) { - set_bit(BLOCK_FREED, &cn->state); - if (cn->bh) { - /* - * remove_from_transaction will brelse - * the buffer if it was in the current - * trans - */ - if (!cleaned) { - clear_buffer_journal_dirty(cn-> - bh); - clear_buffer_dirty(cn->bh); - clear_buffer_journal_test(cn-> - bh); - cleaned = 1; - put_bh(cn->bh); - if (atomic_read - (&cn->bh->b_count) < 0) { - reiserfs_warning(sb, - "journal-2138", - "cn->bh->b_count < 0"); - } - } - /* - * since we are clearing the bh, - * we MUST dec nonzerolen - */ - if (cn->jlist) { - atomic_dec(&cn->jlist-> - j_nonzerolen); - } - cn->bh = NULL; - } - } - cn = cn->hnext; - } - } - - if (bh) - release_buffer_page(bh); /* get_hash grabs the buffer */ - return 0; -} - -void reiserfs_update_inode_transaction(struct inode *inode) -{ - struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); - REISERFS_I(inode)->i_jl = journal->j_current_jl; - REISERFS_I(inode)->i_trans_id = journal->j_trans_id; -} - -/* - * returns -1 on error, 0 if no commits/barriers were done and 1 - * if a transaction was actually committed and the barrier was done - */ -static int __commit_trans_jl(struct inode *inode, unsigned long id, - struct reiserfs_journal_list *jl) -{ - struct reiserfs_transaction_handle th; - struct super_block *sb = inode->i_sb; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - int ret = 0; - - /* - * is it from the current transaction, - * or from an unknown transaction? - */ - if (id == journal->j_trans_id) { - jl = journal->j_current_jl; - /* - * try to let other writers come in and - * grow this transaction - */ - let_transaction_grow(sb, id); - if (journal->j_trans_id != id) { - goto flush_commit_only; - } - - ret = journal_begin(&th, sb, 1); - if (ret) - return ret; - - /* someone might have ended this transaction while we joined */ - if (journal->j_trans_id != id) { - reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), - 1); - journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); - ret = journal_end(&th); - goto flush_commit_only; - } - - ret = journal_end_sync(&th); - if (!ret) - ret = 1; - - } else { - /* - * this gets tricky, we have to make sure the journal list in - * the inode still exists. We know the list is still around - * if we've got a larger transaction id than the oldest list - */ -flush_commit_only: - if (journal_list_still_alive(inode->i_sb, id)) { - /* - * we only set ret to 1 when we know for sure - * the barrier hasn't been started yet on the commit - * block. - */ - if (atomic_read(&jl->j_commit_left) > 1) - ret = 1; - flush_commit_list(sb, jl, 1); - if (journal->j_errno) - ret = journal->j_errno; - } - } - /* otherwise the list is gone, and long since committed */ - return ret; -} - -int reiserfs_commit_for_inode(struct inode *inode) -{ - unsigned int id = REISERFS_I(inode)->i_trans_id; - struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; - - /* - * for the whole inode, assume unset id means it was - * changed in the current transaction. More conservative - */ - if (!id || !jl) { - reiserfs_update_inode_transaction(inode); - id = REISERFS_I(inode)->i_trans_id; - /* jl will be updated in __commit_trans_jl */ - } - - return __commit_trans_jl(inode, id, jl); -} - -void reiserfs_restore_prepared_buffer(struct super_block *sb, - struct buffer_head *bh) -{ - struct reiserfs_journal *journal = SB_JOURNAL(sb); - PROC_INFO_INC(sb, journal.restore_prepared); - if (!bh) { - return; - } - if (test_clear_buffer_journal_restore_dirty(bh) && - buffer_journal_dirty(bh)) { - struct reiserfs_journal_cnode *cn; - reiserfs_write_lock(sb); - cn = get_journal_hash_dev(sb, - journal->j_list_hash_table, - bh->b_blocknr); - if (cn && can_dirty(cn)) { - set_buffer_journal_test(bh); - mark_buffer_dirty(bh); - } - reiserfs_write_unlock(sb); - } - clear_buffer_journal_prepared(bh); -} - -extern struct tree_balance *cur_tb; -/* - * before we can change a metadata block, we have to make sure it won't - * be written to disk while we are altering it. So, we must: - * clean it - * wait on it. - */ -int reiserfs_prepare_for_journal(struct super_block *sb, - struct buffer_head *bh, int wait) -{ - PROC_INFO_INC(sb, journal.prepare); - - if (!trylock_buffer(bh)) { - if (!wait) - return 0; - lock_buffer(bh); - } - set_buffer_journal_prepared(bh); - if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { - clear_buffer_journal_test(bh); - set_buffer_journal_restore_dirty(bh); - } - unlock_buffer(bh); - return 1; -} - -/* - * long and ugly. If flush, will not return until all commit - * blocks and all real buffers in the trans are on disk. - * If no_async, won't return until all commit blocks are on disk. - * - * keep reading, there are comments as you go along - * - * If the journal is aborted, we just clean up. Things like flushing - * journal lists, etc just won't happen. - */ -static int do_journal_end(struct reiserfs_transaction_handle *th, int flags) -{ - struct super_block *sb = th->t_super; - struct reiserfs_journal *journal = SB_JOURNAL(sb); - struct reiserfs_journal_cnode *cn, *next, *jl_cn; - struct reiserfs_journal_cnode *last_cn = NULL; - struct reiserfs_journal_desc *desc; - struct reiserfs_journal_commit *commit; - struct buffer_head *c_bh; /* commit bh */ - struct buffer_head *d_bh; /* desc bh */ - int cur_write_start = 0; /* start index of current log write */ - int i; - int flush; - int wait_on_commit; - struct reiserfs_journal_list *jl, *temp_jl; - struct list_head *entry, *safe; - unsigned long jindex; - unsigned int commit_trans_id; - int trans_half; - int depth; - - BUG_ON(th->t_refcount > 1); - BUG_ON(!th->t_trans_id); - BUG_ON(!th->t_super); - - /* - * protect flush_older_commits from doing mistakes if the - * transaction ID counter gets overflowed. - */ - if (th->t_trans_id == ~0U) - flags |= FLUSH_ALL | COMMIT_NOW | WAIT; - flush = flags & FLUSH_ALL; - wait_on_commit = flags & WAIT; - - current->journal_info = th->t_handle_save; - reiserfs_check_lock_depth(sb, "journal end"); - if (journal->j_len == 0) { - reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), - 1); - journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); - } - - lock_journal(sb); - if (journal->j_next_full_flush) { - flags |= FLUSH_ALL; - flush = 1; - } - if (journal->j_next_async_flush) { - flags |= COMMIT_NOW | WAIT; - wait_on_commit = 1; - } - - /* - * check_journal_end locks the journal, and unlocks if it does - * not return 1 it tells us if we should continue with the - * journal_end, or just return - */ - if (!check_journal_end(th, flags)) { - reiserfs_schedule_old_flush(sb); - wake_queued_writers(sb); - reiserfs_async_progress_wait(sb); - goto out; - } - - /* check_journal_end might set these, check again */ - if (journal->j_next_full_flush) { - flush = 1; - } - - /* - * j must wait means we have to flush the log blocks, and the - * real blocks for this transaction - */ - if (journal->j_must_wait > 0) { - flush = 1; - } -#ifdef REISERFS_PREALLOCATE - /* - * quota ops might need to nest, setup the journal_info pointer - * for them and raise the refcount so that it is > 0. - */ - current->journal_info = th; - th->t_refcount++; - - /* it should not involve new blocks into the transaction */ - reiserfs_discard_all_prealloc(th); - - th->t_refcount--; - current->journal_info = th->t_handle_save; -#endif - - /* setup description block */ - d_bh = - journal_getblk(sb, - SB_ONDISK_JOURNAL_1st_BLOCK(sb) + - journal->j_start); - set_buffer_uptodate(d_bh); - desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; - memset(d_bh->b_data, 0, d_bh->b_size); - memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); - set_desc_trans_id(desc, journal->j_trans_id); - - /* - * setup commit block. Don't write (keep it clean too) this one - * until after everyone else is written - */ - c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + - ((journal->j_start + journal->j_len + - 1) % SB_ONDISK_JOURNAL_SIZE(sb))); - commit = (struct reiserfs_journal_commit *)c_bh->b_data; - memset(c_bh->b_data, 0, c_bh->b_size); - set_commit_trans_id(commit, journal->j_trans_id); - set_buffer_uptodate(c_bh); - - /* init this journal list */ - jl = journal->j_current_jl; - - /* - * we lock the commit before doing anything because - * we want to make sure nobody tries to run flush_commit_list until - * the new transaction is fully setup, and we've already flushed the - * ordered bh list - */ - reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); - - /* save the transaction id in case we need to commit it later */ - commit_trans_id = jl->j_trans_id; - - atomic_set(&jl->j_older_commits_done, 0); - jl->j_trans_id = journal->j_trans_id; - jl->j_timestamp = journal->j_trans_start_time; - jl->j_commit_bh = c_bh; - jl->j_start = journal->j_start; - jl->j_len = journal->j_len; - atomic_set(&jl->j_nonzerolen, journal->j_len); - atomic_set(&jl->j_commit_left, journal->j_len + 2); - jl->j_realblock = NULL; - - /* - * The ENTIRE FOR LOOP MUST not cause schedule to occur. - * for each real block, add it to the journal list hash, - * copy into real block index array in the commit or desc block - */ - trans_half = journal_trans_half(sb->s_blocksize); - for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { - if (buffer_journaled(cn->bh)) { - jl_cn = get_cnode(sb); - if (!jl_cn) { - reiserfs_panic(sb, "journal-1676", - "get_cnode returned NULL"); - } - if (i == 0) { - jl->j_realblock = jl_cn; - } - jl_cn->prev = last_cn; - jl_cn->next = NULL; - if (last_cn) { - last_cn->next = jl_cn; - } - last_cn = jl_cn; - /* - * make sure the block we are trying to log - * is not a block of journal or reserved area - */ - if (is_block_in_log_or_reserved_area - (sb, cn->bh->b_blocknr)) { - reiserfs_panic(sb, "journal-2332", - "Trying to log block %lu, " - "which is a log block", - cn->bh->b_blocknr); - } - jl_cn->blocknr = cn->bh->b_blocknr; - jl_cn->state = 0; - jl_cn->sb = sb; - jl_cn->bh = cn->bh; - jl_cn->jlist = jl; - insert_journal_hash(journal->j_list_hash_table, jl_cn); - if (i < trans_half) { - desc->j_realblock[i] = - cpu_to_le32(cn->bh->b_blocknr); - } else { - commit->j_realblock[i - trans_half] = - cpu_to_le32(cn->bh->b_blocknr); - } - } else { - i--; - } - } - set_desc_trans_len(desc, journal->j_len); - set_desc_mount_id(desc, journal->j_mount_id); - set_desc_trans_id(desc, journal->j_trans_id); - set_commit_trans_len(commit, journal->j_len); - - /* - * special check in case all buffers in the journal - * were marked for not logging - */ - BUG_ON(journal->j_len == 0); - - /* - * we're about to dirty all the log blocks, mark the description block - * dirty now too. Don't mark the commit block dirty until all the - * others are on disk - */ - mark_buffer_dirty(d_bh); - - /* - * first data block is j_start + 1, so add one to - * cur_write_start wherever you use it - */ - cur_write_start = journal->j_start; - cn = journal->j_first; - jindex = 1; /* start at one so we don't get the desc again */ - while (cn) { - clear_buffer_journal_new(cn->bh); - /* copy all the real blocks into log area. dirty log blocks */ - if (buffer_journaled(cn->bh)) { - struct buffer_head *tmp_bh; - char *addr; - struct page *page; - tmp_bh = - journal_getblk(sb, - SB_ONDISK_JOURNAL_1st_BLOCK(sb) + - ((cur_write_start + - jindex) % - SB_ONDISK_JOURNAL_SIZE(sb))); - set_buffer_uptodate(tmp_bh); - page = cn->bh->b_page; - addr = kmap(page); - memcpy(tmp_bh->b_data, - addr + offset_in_page(cn->bh->b_data), - cn->bh->b_size); - kunmap(page); - mark_buffer_dirty(tmp_bh); - jindex++; - set_buffer_journal_dirty(cn->bh); - clear_buffer_journaled(cn->bh); - } else { - /* - * JDirty cleared sometime during transaction. - * don't log this one - */ - reiserfs_warning(sb, "journal-2048", - "BAD, buffer in journal hash, " - "but not JDirty!"); - brelse(cn->bh); - } - next = cn->next; - free_cnode(sb, cn); - cn = next; - reiserfs_cond_resched(sb); - } - - /* - * we are done with both the c_bh and d_bh, but - * c_bh must be written after all other commit blocks, - * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. - */ - - journal->j_current_jl = alloc_journal_list(sb); - - /* now it is safe to insert this transaction on the main list */ - list_add_tail(&jl->j_list, &journal->j_journal_list); - list_add_tail(&jl->j_working_list, &journal->j_working_list); - journal->j_num_work_lists++; - - /* reset journal values for the next transaction */ - journal->j_start = - (journal->j_start + journal->j_len + - 2) % SB_ONDISK_JOURNAL_SIZE(sb); - atomic_set(&journal->j_wcount, 0); - journal->j_bcount = 0; - journal->j_last = NULL; - journal->j_first = NULL; - journal->j_len = 0; - journal->j_trans_start_time = 0; - /* check for trans_id overflow */ - if (++journal->j_trans_id == 0) - journal->j_trans_id = 10; - journal->j_current_jl->j_trans_id = journal->j_trans_id; - journal->j_must_wait = 0; - journal->j_len_alloc = 0; - journal->j_next_full_flush = 0; - journal->j_next_async_flush = 0; - init_journal_hash(sb); - - /* - * make sure reiserfs_add_jh sees the new current_jl before we - * write out the tails - */ - smp_mb(); - - /* - * tail conversion targets have to hit the disk before we end the - * transaction. Otherwise a later transaction might repack the tail - * before this transaction commits, leaving the data block unflushed - * and clean, if we crash before the later transaction commits, the - * data block is lost. - */ - if (!list_empty(&jl->j_tail_bh_list)) { - depth = reiserfs_write_unlock_nested(sb); - write_ordered_buffers(&journal->j_dirty_buffers_lock, - journal, jl, &jl->j_tail_bh_list); - reiserfs_write_lock_nested(sb, depth); - } - BUG_ON(!list_empty(&jl->j_tail_bh_list)); - mutex_unlock(&jl->j_commit_mutex); - - /* - * honor the flush wishes from the caller, simple commits can - * be done outside the journal lock, they are done below - * - * if we don't flush the commit list right now, we put it into - * the work queue so the people waiting on the async progress work - * queue don't wait for this proc to flush journal lists and such. - */ - if (flush) { - flush_commit_list(sb, jl, 1); - flush_journal_list(sb, jl, 1); - } else if (!(jl->j_state & LIST_COMMIT_PENDING)) { - /* - * Avoid queueing work when sb is being shut down. Transaction - * will be flushed on journal shutdown. - */ - if (sb->s_flags & SB_ACTIVE) - queue_delayed_work(REISERFS_SB(sb)->commit_wq, - &journal->j_work, HZ / 10); - } - - /* - * if the next transaction has any chance of wrapping, flush - * transactions that might get overwritten. If any journal lists - * are very old flush them as well. - */ -first_jl: - list_for_each_safe(entry, safe, &journal->j_journal_list) { - temp_jl = JOURNAL_LIST_ENTRY(entry); - if (journal->j_start <= temp_jl->j_start) { - if ((journal->j_start + journal->j_trans_max + 1) >= - temp_jl->j_start) { - flush_used_journal_lists(sb, temp_jl); - goto first_jl; - } else if ((journal->j_start + - journal->j_trans_max + 1) < - SB_ONDISK_JOURNAL_SIZE(sb)) { - /* - * if we don't cross into the next - * transaction and we don't wrap, there is - * no way we can overlap any later transactions - * break now - */ - break; - } - } else if ((journal->j_start + - journal->j_trans_max + 1) > - SB_ONDISK_JOURNAL_SIZE(sb)) { - if (((journal->j_start + journal->j_trans_max + 1) % - SB_ONDISK_JOURNAL_SIZE(sb)) >= - temp_jl->j_start) { - flush_used_journal_lists(sb, temp_jl); - goto first_jl; - } else { - /* - * we don't overlap anything from out start - * to the end of the log, and our wrapped - * portion doesn't overlap anything at - * the start of the log. We can break - */ - break; - } - } - } - - journal->j_current_jl->j_list_bitmap = - get_list_bitmap(sb, journal->j_current_jl); - - if (!(journal->j_current_jl->j_list_bitmap)) { - reiserfs_panic(sb, "journal-1996", - "could not get a list bitmap"); - } - - atomic_set(&journal->j_jlock, 0); - unlock_journal(sb); - /* wake up any body waiting to join. */ - clear_bit(J_WRITERS_QUEUED, &journal->j_state); - wake_up(&journal->j_join_wait); - - if (!flush && wait_on_commit && - journal_list_still_alive(sb, commit_trans_id)) { - flush_commit_list(sb, jl, 1); - } -out: - reiserfs_check_lock_depth(sb, "journal end2"); - - memset(th, 0, sizeof(*th)); - /* - * Re-set th->t_super, so we can properly keep track of how many - * persistent transactions there are. We need to do this so if this - * call is part of a failed restart_transaction, we can free it later - */ - th->t_super = sb; - - return journal->j_errno; -} - -/* Send the file system read only and refuse new transactions */ -void reiserfs_abort_journal(struct super_block *sb, int errno) -{ - struct reiserfs_journal *journal = SB_JOURNAL(sb); - if (test_bit(J_ABORTED, &journal->j_state)) - return; - - if (!journal->j_errno) - journal->j_errno = errno; - - sb->s_flags |= SB_RDONLY; - set_bit(J_ABORTED, &journal->j_state); - -#ifdef CONFIG_REISERFS_CHECK - dump_stack(); -#endif -} |