--- /dev/null
+/*
+ * Write ahead logging implementation copyright Chris Mason 2000
+ *
+ * The background commits make this code very interrelated, and
+ * overly complex. I need to rethink things a bit....The major players:
+ *
+ * journal_begin -- call with the number of blocks you expect to log.
+ * If the current transaction is too
+ * old, it will block until the current transaction is
+ * finished, and then start a new one.
+ * Usually, your transaction will get joined in with
+ * previous ones for speed.
+ *
+ * journal_join -- same as journal_begin, but won't block on the current
+ * transaction regardless of age. Don't ever call
+ * this. Ever. There are only two places it should be
+ * called from, and they are both inside this file.
+ *
+ * journal_mark_dirty -- adds blocks into this transaction. clears any flags
+ * that might make them get sent to disk
+ * and then marks them BH_JDirty. Puts the buffer head
+ * into the current transaction hash.
+ *
+ * journal_end -- if the current transaction is batchable, it does nothing
+ * otherwise, it could do an async/synchronous commit, or
+ * a full flush of all log and real blocks in the
+ * transaction.
+ *
+ * flush_old_commits -- if the current transaction is too old, it is ended and
+ * commit blocks are sent to disk. Forces commit blocks
+ * to disk for all backgrounded commits that have been
+ * around too long.
+ * -- Note, if you call this as an immediate flush from
+ * from within kupdate, it will ignore the immediate flag
+ */
+
+#include <linux/time.h>
+#include <linux/semaphore.h>
+#include <linux/vmalloc.h>
+#include "reiserfs.h"
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/buffer_head.h>
+#include <linux/workqueue.h>
+#include <linux/writeback.h>
+#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+
+
+/* gets a struct reiserfs_journal_list * from a list head */
+#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
+ j_list))
+#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
+ j_working_list))
+
+/* must be correct to keep the desc and commit structs at 4k */
+#define JOURNAL_TRANS_HALF 1018
+#define BUFNR 64 /*read ahead */
+
+/* cnode stat bits. Move these into reiserfs_fs.h */
+
+/* this block was freed, and can't be written. */
+#define BLOCK_FREED 2
+/* this block was freed during this transaction, and can't be written */
+#define BLOCK_FREED_HOLDER 3
+
+/* used in flush_journal_list */
+#define BLOCK_NEEDS_FLUSH 4
+#define BLOCK_DIRTIED 5
+
+/* journal list state bits */
+#define LIST_TOUCHED 1
+#define LIST_DIRTY 2
+#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
+
+/* flags for do_journal_end */
+#define FLUSH_ALL 1 /* flush commit and real blocks */
+#define COMMIT_NOW 2 /* end and commit this transaction */
+#define WAIT 4 /* wait for the log blocks to hit the disk */
+
+static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
+static int flush_journal_list(struct super_block *s,
+ struct reiserfs_journal_list *jl, int flushall);
+static int flush_commit_list(struct super_block *s,
+ struct reiserfs_journal_list *jl, int flushall);
+static int can_dirty(struct reiserfs_journal_cnode *cn);
+static int journal_join(struct reiserfs_transaction_handle *th,
+ struct super_block *sb);
+static void release_journal_dev(struct super_block *super,
+ struct reiserfs_journal *journal);
+static int dirty_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl);
+static void flush_async_commits(struct work_struct *work);
+static void queue_log_writer(struct super_block *s);
+
+/* values for join in do_journal_begin_r */
+enum {
+ JBEGIN_REG = 0, /* regular journal begin */
+ /* join the running transaction if at all possible */
+ JBEGIN_JOIN = 1,
+ /* called from cleanup code, ignores aborted flag */
+ JBEGIN_ABORT = 2,
+};
+
+static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
+ struct super_block *sb,
+ unsigned long nblocks, int join);
+
+static void init_journal_hash(struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ memset(journal->j_hash_table, 0,
+ JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
+}
+
+/*
+ * clears BH_Dirty and sticks the buffer on the clean list. Called because
+ * I can't allow refile_buffer to make schedule happen after I've freed a
+ * block. Look at remove_from_transaction and journal_mark_freed for
+ * more details.
+ */
+static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
+{
+ if (bh) {
+ clear_buffer_dirty(bh);
+ clear_buffer_journal_test(bh);
+ }
+ return 0;
+}
+
+static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
+ *sb)
+{
+ struct reiserfs_bitmap_node *bn;
+ static int id;
+
+ bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
+ if (!bn) {
+ return NULL;
+ }
+ bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
+ if (!bn->data) {
+ kfree(bn);
+ return NULL;
+ }
+ bn->id = id++;
+ INIT_LIST_HEAD(&bn->list);
+ return bn;
+}
+
+static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_bitmap_node *bn = NULL;
+ struct list_head *entry = journal->j_bitmap_nodes.next;
+
+ journal->j_used_bitmap_nodes++;
+repeat:
+
+ if (entry != &journal->j_bitmap_nodes) {
+ bn = list_entry(entry, struct reiserfs_bitmap_node, list);
+ list_del(entry);
+ memset(bn->data, 0, sb->s_blocksize);
+ journal->j_free_bitmap_nodes--;
+ return bn;
+ }
+ bn = allocate_bitmap_node(sb);
+ if (!bn) {
+ yield();
+ goto repeat;
+ }
+ return bn;
+}
+static inline void free_bitmap_node(struct super_block *sb,
+ struct reiserfs_bitmap_node *bn)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ journal->j_used_bitmap_nodes--;
+ if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
+ kfree(bn->data);
+ kfree(bn);
+ } else {
+ list_add(&bn->list, &journal->j_bitmap_nodes);
+ journal->j_free_bitmap_nodes++;
+ }
+}
+
+static void allocate_bitmap_nodes(struct super_block *sb)
+{
+ int i;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_bitmap_node *bn = NULL;
+ for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
+ bn = allocate_bitmap_node(sb);
+ if (bn) {
+ list_add(&bn->list, &journal->j_bitmap_nodes);
+ journal->j_free_bitmap_nodes++;
+ } else {
+ /* this is ok, we'll try again when more are needed */
+ break;
+ }
+ }
+}
+
+static int set_bit_in_list_bitmap(struct super_block *sb,
+ b_blocknr_t block,
+ struct reiserfs_list_bitmap *jb)
+{
+ unsigned int bmap_nr = block / (sb->s_blocksize << 3);
+ unsigned int bit_nr = block % (sb->s_blocksize << 3);
+
+ if (!jb->bitmaps[bmap_nr]) {
+ jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
+ }
+ set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
+ return 0;
+}
+
+static void cleanup_bitmap_list(struct super_block *sb,
+ struct reiserfs_list_bitmap *jb)
+{
+ int i;
+ if (jb->bitmaps == NULL)
+ return;
+
+ for (i = 0; i < reiserfs_bmap_count(sb); i++) {
+ if (jb->bitmaps[i]) {
+ free_bitmap_node(sb, jb->bitmaps[i]);
+ jb->bitmaps[i] = NULL;
+ }
+ }
+}
+
+/*
+ * only call this on FS unmount.
+ */
+static int free_list_bitmaps(struct super_block *sb,
+ struct reiserfs_list_bitmap *jb_array)
+{
+ int i;
+ struct reiserfs_list_bitmap *jb;
+ for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
+ jb = jb_array + i;
+ jb->journal_list = NULL;
+ cleanup_bitmap_list(sb, jb);
+ vfree(jb->bitmaps);
+ jb->bitmaps = NULL;
+ }
+ return 0;
+}
+
+static int free_bitmap_nodes(struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct list_head *next = journal->j_bitmap_nodes.next;
+ struct reiserfs_bitmap_node *bn;
+
+ while (next != &journal->j_bitmap_nodes) {
+ bn = list_entry(next, struct reiserfs_bitmap_node, list);
+ list_del(next);
+ kfree(bn->data);
+ kfree(bn);
+ next = journal->j_bitmap_nodes.next;
+ journal->j_free_bitmap_nodes--;
+ }
+
+ return 0;
+}
+
+/*
+ * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
+ * jb_array is the array to be filled in.
+ */
+int reiserfs_allocate_list_bitmaps(struct super_block *sb,
+ struct reiserfs_list_bitmap *jb_array,
+ unsigned int bmap_nr)
+{
+ int i;
+ int failed = 0;
+ struct reiserfs_list_bitmap *jb;
+ int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
+
+ for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
+ jb = jb_array + i;
+ jb->journal_list = NULL;
+ jb->bitmaps = vzalloc(mem);
+ if (!jb->bitmaps) {
+ reiserfs_warning(sb, "clm-2000", "unable to "
+ "allocate bitmaps for journal lists");
+ failed = 1;
+ break;
+ }
+ }
+ if (failed) {
+ free_list_bitmaps(sb, jb_array);
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * find an available list bitmap. If you can't find one, flush a commit list
+ * and try again
+ */
+static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
+ struct reiserfs_journal_list
+ *jl)
+{
+ int i, j;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_list_bitmap *jb = NULL;
+
+ for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
+ i = journal->j_list_bitmap_index;
+ journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
+ jb = journal->j_list_bitmap + i;
+ if (journal->j_list_bitmap[i].journal_list) {
+ flush_commit_list(sb,
+ journal->j_list_bitmap[i].
+ journal_list, 1);
+ if (!journal->j_list_bitmap[i].journal_list) {
+ break;
+ }
+ } else {
+ break;
+ }
+ }
+ /* double check to make sure if flushed correctly */
+ if (jb->journal_list)
+ return NULL;
+ jb->journal_list = jl;
+ return jb;
+}
+
+/*
+ * allocates a new chunk of X nodes, and links them all together as a list.
+ * Uses the cnode->next and cnode->prev pointers
+ * returns NULL on failure
+ */
+static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
+{
+ struct reiserfs_journal_cnode *head;
+ int i;
+ if (num_cnodes <= 0) {
+ return NULL;
+ }
+ head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
+ if (!head) {
+ return NULL;
+ }
+ head[0].prev = NULL;
+ head[0].next = head + 1;
+ for (i = 1; i < num_cnodes; i++) {
+ head[i].prev = head + (i - 1);
+ head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
+ }
+ head[num_cnodes - 1].next = NULL;
+ return head;
+}
+
+/* pulls a cnode off the free list, or returns NULL on failure */
+static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
+{
+ struct reiserfs_journal_cnode *cn;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+
+ reiserfs_check_lock_depth(sb, "get_cnode");
+
+ if (journal->j_cnode_free <= 0) {
+ return NULL;
+ }
+ journal->j_cnode_used++;
+ journal->j_cnode_free--;
+ cn = journal->j_cnode_free_list;
+ if (!cn) {
+ return cn;
+ }
+ if (cn->next) {
+ cn->next->prev = NULL;
+ }
+ journal->j_cnode_free_list = cn->next;
+ memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
+ return cn;
+}
+
+/*
+ * returns a cnode to the free list
+ */
+static void free_cnode(struct super_block *sb,
+ struct reiserfs_journal_cnode *cn)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+
+ reiserfs_check_lock_depth(sb, "free_cnode");
+
+ journal->j_cnode_used--;
+ journal->j_cnode_free++;
+ /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
+ cn->next = journal->j_cnode_free_list;
+ if (journal->j_cnode_free_list) {
+ journal->j_cnode_free_list->prev = cn;
+ }
+ cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
+ journal->j_cnode_free_list = cn;
+}
+
+static void clear_prepared_bits(struct buffer_head *bh)
+{
+ clear_buffer_journal_prepared(bh);
+ clear_buffer_journal_restore_dirty(bh);
+}
+
+/*
+ * return a cnode with same dev, block number and size in table,
+ * or null if not found
+ */
+static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
+ super_block
+ *sb,
+ struct
+ reiserfs_journal_cnode
+ **table,
+ long bl)
+{
+ struct reiserfs_journal_cnode *cn;
+ cn = journal_hash(table, sb, bl);
+ while (cn) {
+ if (cn->blocknr == bl && cn->sb == sb)
+ return cn;
+ cn = cn->hnext;
+ }
+ return (struct reiserfs_journal_cnode *)0;
+}
+
+/*
+ * this actually means 'can this block be reallocated yet?'. If you set
+ * search_all, a block can only be allocated if it is not in the current
+ * transaction, was not freed by the current transaction, and has no chance
+ * of ever being overwritten by a replay after crashing.
+ *
+ * If you don't set search_all, a block can only be allocated if it is not
+ * in the current transaction. Since deleting a block removes it from the
+ * current transaction, this case should never happen. If you don't set
+ * search_all, make sure you never write the block without logging it.
+ *
+ * next_zero_bit is a suggestion about the next block to try for find_forward.
+ * when bl is rejected because it is set in a journal list bitmap, we search
+ * for the next zero bit in the bitmap that rejected bl. Then, we return
+ * that through next_zero_bit for find_forward to try.
+ *
+ * Just because we return something in next_zero_bit does not mean we won't
+ * reject it on the next call to reiserfs_in_journal
+ */
+int reiserfs_in_journal(struct super_block *sb,
+ unsigned int bmap_nr, int bit_nr, int search_all,
+ b_blocknr_t * next_zero_bit)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_journal_cnode *cn;
+ struct reiserfs_list_bitmap *jb;
+ int i;
+ unsigned long bl;
+
+ *next_zero_bit = 0; /* always start this at zero. */
+
+ PROC_INFO_INC(sb, journal.in_journal);
+ /*
+ * If we aren't doing a search_all, this is a metablock, and it
+ * will be logged before use. if we crash before the transaction
+ * that freed it commits, this transaction won't have committed
+ * either, and the block will never be written
+ */
+ if (search_all) {
+ for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
+ PROC_INFO_INC(sb, journal.in_journal_bitmap);
+ jb = journal->j_list_bitmap + i;
+ if (jb->journal_list && jb->bitmaps[bmap_nr] &&
+ test_bit(bit_nr,
+ (unsigned long *)jb->bitmaps[bmap_nr]->
+ data)) {
+ *next_zero_bit =
+ find_next_zero_bit((unsigned long *)
+ (jb->bitmaps[bmap_nr]->
+ data),
+ sb->s_blocksize << 3,
+ bit_nr + 1);
+ return 1;
+ }
+ }
+ }
+
+ bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
+ /* is it in any old transactions? */
+ if (search_all
+ && (cn =
+ get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
+ return 1;
+ }
+
+ /* is it in the current transaction. This should never happen */
+ if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
+ BUG();
+ return 1;
+ }
+
+ PROC_INFO_INC(sb, journal.in_journal_reusable);
+ /* safe for reuse */
+ return 0;
+}
+
+/* insert cn into table */
+static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
+ struct reiserfs_journal_cnode *cn)
+{
+ struct reiserfs_journal_cnode *cn_orig;
+
+ cn_orig = journal_hash(table, cn->sb, cn->blocknr);
+ cn->hnext = cn_orig;
+ cn->hprev = NULL;
+ if (cn_orig) {
+ cn_orig->hprev = cn;
+ }
+ journal_hash(table, cn->sb, cn->blocknr) = cn;
+}
+
+/* lock the current transaction */
+static inline void lock_journal(struct super_block *sb)
+{
+ PROC_INFO_INC(sb, journal.lock_journal);
+
+ reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
+}
+
+/* unlock the current transaction */
+static inline void unlock_journal(struct super_block *sb)
+{
+ mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
+}
+
+static inline void get_journal_list(struct reiserfs_journal_list *jl)
+{
+ jl->j_refcount++;
+}
+
+static inline void put_journal_list(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ if (jl->j_refcount < 1) {
+ reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
+ jl->j_trans_id, jl->j_refcount);
+ }
+ if (--jl->j_refcount == 0)
+ kfree(jl);
+}
+
+/*
+ * this used to be much more involved, and I'm keeping it just in case
+ * things get ugly again. it gets called by flush_commit_list, and
+ * cleans up any data stored about blocks freed during a transaction.
+ */
+static void cleanup_freed_for_journal_list(struct super_block *sb,
+ struct reiserfs_journal_list *jl)
+{
+
+ struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
+ if (jb) {
+ cleanup_bitmap_list(sb, jb);
+ }
+ jl->j_list_bitmap->journal_list = NULL;
+ jl->j_list_bitmap = NULL;
+}
+
+static int journal_list_still_alive(struct super_block *s,
+ unsigned int trans_id)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ struct list_head *entry = &journal->j_journal_list;
+ struct reiserfs_journal_list *jl;
+
+ if (!list_empty(entry)) {
+ jl = JOURNAL_LIST_ENTRY(entry->next);
+ if (jl->j_trans_id <= trans_id) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * If page->mapping was null, we failed to truncate this page for
+ * some reason. Most likely because it was truncated after being
+ * logged via data=journal.
+ *
+ * This does a check to see if the buffer belongs to one of these
+ * lost pages before doing the final put_bh. If page->mapping was
+ * null, it tries to free buffers on the page, which should make the
+ * final page_cache_release drop the page from the lru.
+ */
+static void release_buffer_page(struct buffer_head *bh)
+{
+ struct page *page = bh->b_page;
+ if (!page->mapping && trylock_page(page)) {
+ page_cache_get(page);
+ put_bh(bh);
+ if (!page->mapping)
+ try_to_free_buffers(page);
+ unlock_page(page);
+ page_cache_release(page);
+ } else {
+ put_bh(bh);
+ }
+}
+
+static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
+{
+ char b[BDEVNAME_SIZE];
+
+ if (buffer_journaled(bh)) {
+ reiserfs_warning(NULL, "clm-2084",
+ "pinned buffer %lu:%s sent to disk",
+ bh->b_blocknr, bdevname(bh->b_bdev, b));
+ }
+ 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(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(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 invalidatepage here.
+ * reiserfs_invalidate_page will pin any buffer that has a
+ * valid journal head from an older transaction. If someone
+ * else sets our buffer dirty after we write it in the first
+ * loop, and then someone truncates the page away, nobody
+ * will ever write the buffer. We're safe if we write the
+ * page one last time after freeing the journal header.
+ */
+ if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
+ spin_unlock(lock);
+ ll_rw_block(WRITE, 1, &bh);
+ spin_lock(lock);
+ }
+ put_bh(bh);
+ cond_resched_lock(lock);
+ }
+ spin_unlock(lock);
+ return ret;
+}
+
+static int flush_older_commits(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ struct reiserfs_journal_list *other_jl;
+ struct reiserfs_journal_list *first_jl;
+ struct list_head *entry;
+ unsigned int trans_id = jl->j_trans_id;
+ unsigned int other_trans_id;
+ unsigned int first_trans_id;
+
+find_first:
+ /*
+ * first we walk backwards to find the oldest uncommitted transation
+ */
+ first_jl = jl;
+ entry = jl->j_list.prev;
+ while (1) {
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ if (entry == &journal->j_journal_list ||
+ atomic_read(&other_jl->j_older_commits_done))
+ break;
+
+ first_jl = other_jl;
+ entry = other_jl->j_list.prev;
+ }
+
+ /* if we didn't find any older uncommitted transactions, return now */
+ if (first_jl == jl) {
+ return 0;
+ }
+
+ first_trans_id = first_jl->j_trans_id;
+
+ entry = &first_jl->j_list;
+ while (1) {
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ other_trans_id = other_jl->j_trans_id;
+
+ if (other_trans_id < trans_id) {
+ if (atomic_read(&other_jl->j_commit_left) != 0) {
+ flush_commit_list(s, other_jl, 0);
+
+ /* list we were called with is gone, return */
+ if (!journal_list_still_alive(s, trans_id))
+ return 1;
+
+ /*
+ * the one we just flushed is gone, this means
+ * all older lists are also gone, so first_jl
+ * is no longer valid either. Go back to the
+ * beginning.
+ */
+ if (!journal_list_still_alive
+ (s, other_trans_id)) {
+ goto find_first;
+ }
+ }
+ entry = entry->next;
+ if (entry == &journal->j_journal_list)
+ return 0;
+ } else {
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static int reiserfs_async_progress_wait(struct super_block *s)
+{
+ struct reiserfs_journal *j = SB_JOURNAL(s);
+
+ if (atomic_read(&j->j_async_throttle)) {
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(s);
+ congestion_wait(BLK_RW_ASYNC, HZ / 10);
+ reiserfs_write_lock_nested(s, depth);
+ }
+
+ return 0;
+}
+
+/*
+ * if this journal list still has commit blocks unflushed, send them to disk.
+ *
+ * log areas must be flushed in order (transaction 2 can't commit before
+ * transaction 1) Before the commit block can by written, every other log
+ * block must be safely on disk
+ */
+static int flush_commit_list(struct super_block *s,
+ struct reiserfs_journal_list *jl, int flushall)
+{
+ int i;
+ b_blocknr_t bn;
+ struct buffer_head *tbh = NULL;
+ unsigned int trans_id = jl->j_trans_id;
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ int retval = 0;
+ int write_len;
+ int depth;
+
+ reiserfs_check_lock_depth(s, "flush_commit_list");
+
+ if (atomic_read(&jl->j_older_commits_done)) {
+ return 0;
+ }
+
+ /*
+ * before we can put our commit blocks on disk, we have to make
+ * sure everyone older than us is on disk too
+ */
+ BUG_ON(jl->j_len <= 0);
+ BUG_ON(trans_id == journal->j_trans_id);
+
+ get_journal_list(jl);
+ if (flushall) {
+ if (flush_older_commits(s, jl) == 1) {
+ /*
+ * list disappeared during flush_older_commits.
+ * return
+ */
+ goto put_jl;
+ }
+ }
+
+ /* make sure nobody is trying to flush this one at the same time */
+ reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
+
+ if (!journal_list_still_alive(s, trans_id)) {
+ mutex_unlock(&jl->j_commit_mutex);
+ goto put_jl;
+ }
+ BUG_ON(jl->j_trans_id == 0);
+
+ /* this commit is done, exit */
+ if (atomic_read(&jl->j_commit_left) <= 0) {
+ if (flushall) {
+ atomic_set(&jl->j_older_commits_done, 1);
+ }
+ mutex_unlock(&jl->j_commit_mutex);
+ goto put_jl;
+ }
+
+ if (!list_empty(&jl->j_bh_list)) {
+ int ret;
+
+ /*
+ * We might sleep in numerous places inside
+ * write_ordered_buffers. Relax the write lock.
+ */
+ depth = reiserfs_write_unlock_nested(s);
+ ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
+ journal, jl, &jl->j_bh_list);
+ if (ret < 0 && retval == 0)
+ retval = ret;
+ reiserfs_write_lock_nested(s, depth);
+ }
+ BUG_ON(!list_empty(&jl->j_bh_list));
+ /*
+ * for the description block and all the log blocks, submit any buffers
+ * that haven't already reached the disk. Try to write at least 256
+ * log blocks. later on, we will only wait on blocks that correspond
+ * to this transaction, but while we're unplugging we might as well
+ * get a chunk of data on there.
+ */
+ atomic_inc(&journal->j_async_throttle);
+ write_len = jl->j_len + 1;
+ if (write_len < 256)
+ write_len = 256;
+ for (i = 0 ; i < write_len ; i++) {
+ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
+ SB_ONDISK_JOURNAL_SIZE(s);
+ tbh = journal_find_get_block(s, bn);
+ if (tbh) {
+ if (buffer_dirty(tbh)) {
+ depth = reiserfs_write_unlock_nested(s);
+ ll_rw_block(WRITE, 1, &tbh);
+ reiserfs_write_lock_nested(s, depth);
+ }
+ put_bh(tbh) ;
+ }
+ }
+ atomic_dec(&journal->j_async_throttle);
+
+ for (i = 0; i < (jl->j_len + 1); i++) {
+ bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
+ (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
+ tbh = journal_find_get_block(s, bn);
+
+ depth = reiserfs_write_unlock_nested(s);
+ __wait_on_buffer(tbh);
+ reiserfs_write_lock_nested(s, depth);
+ /*
+ * since we're using ll_rw_blk above, it might have skipped
+ * over a locked buffer. Double check here
+ */
+ /* redundant, sync_dirty_buffer() checks */
+ if (buffer_dirty(tbh)) {
+ depth = reiserfs_write_unlock_nested(s);
+ sync_dirty_buffer(tbh);
+ reiserfs_write_lock_nested(s, depth);
+ }
+ if (unlikely(!buffer_uptodate(tbh))) {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning(s, "journal-601",
+ "buffer write failed");
+#endif
+ retval = -EIO;
+ }
+ /* once for journal_find_get_block */
+ put_bh(tbh);
+ /* once due to original getblk in do_journal_end */
+ put_bh(tbh);
+ atomic_dec(&jl->j_commit_left);
+ }
+
+ BUG_ON(atomic_read(&jl->j_commit_left) != 1);
+
+ /*
+ * If there was a write error in the journal - we can't commit
+ * this transaction - it will be invalid and, if successful,
+ * will just end up propagating the write error out to
+ * the file system.
+ */
+ if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
+ if (buffer_dirty(jl->j_commit_bh))
+ BUG();
+ mark_buffer_dirty(jl->j_commit_bh) ;
+ depth = reiserfs_write_unlock_nested(s);
+ if (reiserfs_barrier_flush(s))
+ __sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_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, WRITE_FLUSH_FUA);
+ else
+ sync_dirty_buffer(journal->j_header_bh);
+
+ reiserfs_write_lock_nested(sb, depth);
+ if (!buffer_uptodate(journal->j_header_bh)) {
+ reiserfs_warning(sb, "journal-837",
+ "IO error during journal replay");
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+static int update_journal_header_block(struct super_block *sb,
+ unsigned long offset,
+ unsigned int trans_id)
+{
+ return _update_journal_header_block(sb, offset, trans_id);
+}
+
+/*
+** flush any and all journal lists older than you are
+** can only be called from flush_journal_list
+*/
+static int flush_older_journal_lists(struct super_block *sb,
+ struct reiserfs_journal_list *jl)
+{
+ struct list_head *entry;
+ struct reiserfs_journal_list *other_jl;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ unsigned int trans_id = jl->j_trans_id;
+
+ /*
+ * we know we are the only ones flushing things, no extra race
+ * protection is required.
+ */
+restart:
+ entry = journal->j_journal_list.next;
+ /* Did we wrap? */
+ if (entry == &journal->j_journal_list)
+ return 0;
+ other_jl = JOURNAL_LIST_ENTRY(entry);
+ if (other_jl->j_trans_id < trans_id) {
+ BUG_ON(other_jl->j_refcount <= 0);
+ /* do not flush all */
+ flush_journal_list(sb, other_jl, 0);
+
+ /* other_jl is now deleted from the list */
+ goto restart;
+ }
+ return 0;
+}
+
+static void del_from_work_list(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ if (!list_empty(&jl->j_working_list)) {
+ list_del_init(&jl->j_working_list);
+ journal->j_num_work_lists--;
+ }
+}
+
+/*
+ * flush a journal list, both commit and real blocks
+ *
+ * always set flushall to 1, unless you are calling from inside
+ * flush_journal_list
+ *
+ * IMPORTANT. This can only be called while there are no journal writers,
+ * and the journal is locked. That means it can only be called from
+ * do_journal_end, or by journal_release
+ */
+static int flush_journal_list(struct super_block *s,
+ struct reiserfs_journal_list *jl, int flushall)
+{
+ struct reiserfs_journal_list *pjl;
+ struct reiserfs_journal_cnode *cn, *last;
+ int count;
+ int was_jwait = 0;
+ int was_dirty = 0;
+ struct buffer_head *saved_bh;
+ unsigned long j_len_saved = jl->j_len;
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ int err = 0;
+ int depth;
+
+ BUG_ON(j_len_saved <= 0);
+
+ if (atomic_read(&journal->j_wcount) != 0) {
+ reiserfs_warning(s, "clm-2048", "called with wcount %d",
+ atomic_read(&journal->j_wcount));
+ }
+
+ /* if flushall == 0, the lock is already held */
+ if (flushall) {
+ reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
+ } else if (mutex_trylock(&journal->j_flush_mutex)) {
+ BUG();
+ }
+
+ count = 0;
+ if (j_len_saved > journal->j_trans_max) {
+ reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
+ j_len_saved, jl->j_trans_id);
+ return 0;
+ }
+
+ /* if all the work is already done, get out of here */
+ if (atomic_read(&jl->j_nonzerolen) <= 0 &&
+ atomic_read(&jl->j_commit_left) <= 0) {
+ goto flush_older_and_return;
+ }
+
+ /*
+ * start by putting the commit list on disk. This will also flush
+ * the commit lists of any olders transactions
+ */
+ flush_commit_list(s, jl, 1);
+
+ if (!(jl->j_state & LIST_DIRTY)
+ && !reiserfs_is_journal_aborted(journal))
+ BUG();
+
+ /* are we done now? */
+ if (atomic_read(&jl->j_nonzerolen) <= 0 &&
+ atomic_read(&jl->j_commit_left) <= 0) {
+ goto flush_older_and_return;
+ }
+
+ /*
+ * loop through each cnode, see if we need to write it,
+ * or wait on a more recent transaction, or just ignore it
+ */
+ if (atomic_read(&journal->j_wcount) != 0) {
+ reiserfs_panic(s, "journal-844", "journal list is flushing, "
+ "wcount is not 0");
+ }
+ cn = jl->j_realblock;
+ while (cn) {
+ was_jwait = 0;
+ was_dirty = 0;
+ saved_bh = NULL;
+ /* blocknr of 0 is no longer in the hash, ignore it */
+ if (cn->blocknr == 0) {
+ goto free_cnode;
+ }
+
+ /*
+ * This transaction failed commit.
+ * Don't write out to the disk
+ */
+ if (!(jl->j_state & LIST_DIRTY))
+ goto free_cnode;
+
+ pjl = find_newer_jl_for_cn(cn);
+ /*
+ * the order is important here. We check pjl to make sure we
+ * don't clear BH_JDirty_wait if we aren't the one writing this
+ * block to disk
+ */
+ if (!pjl && cn->bh) {
+ saved_bh = cn->bh;
+
+ /*
+ * we do this to make sure nobody releases the
+ * buffer while we are working with it
+ */
+ get_bh(saved_bh);
+
+ if (buffer_journal_dirty(saved_bh)) {
+ BUG_ON(!can_dirty(cn));
+ was_jwait = 1;
+ was_dirty = 1;
+ } else if (can_dirty(cn)) {
+ /*
+ * everything with !pjl && jwait
+ * should be writable
+ */
+ BUG();
+ }
+ }
+
+ /*
+ * if someone has this block in a newer transaction, just make
+ * sure they are committed, and don't try writing it to disk
+ */
+ if (pjl) {
+ if (atomic_read(&pjl->j_commit_left))
+ flush_commit_list(s, pjl, 1);
+ goto free_cnode;
+ }
+
+ /*
+ * bh == NULL when the block got to disk on its own, OR,
+ * the block got freed in a future transaction
+ */
+ if (saved_bh == NULL) {
+ goto free_cnode;
+ }
+
+ /*
+ * this should never happen. kupdate_one_transaction has
+ * this list locked while it works, so we should never see a
+ * buffer here that is not marked JDirty_wait
+ */
+ if ((!was_jwait) && !buffer_locked(saved_bh)) {
+ reiserfs_warning(s, "journal-813",
+ "BAD! buffer %llu %cdirty %cjwait, "
+ "not in a newer tranasction",
+ (unsigned long long)saved_bh->
+ b_blocknr, was_dirty ? ' ' : '!',
+ was_jwait ? ' ' : '!');
+ }
+ if (was_dirty) {
+ /*
+ * we inc again because saved_bh gets decremented
+ * at free_cnode
+ */
+ get_bh(saved_bh);
+ set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
+ lock_buffer(saved_bh);
+ BUG_ON(cn->blocknr != saved_bh->b_blocknr);
+ if (buffer_dirty(saved_bh))
+ submit_logged_buffer(saved_bh);
+ else
+ unlock_buffer(saved_bh);
+ count++;
+ } else {
+ reiserfs_warning(s, "clm-2082",
+ "Unable to flush buffer %llu in %s",
+ (unsigned long long)saved_bh->
+ b_blocknr, __func__);
+ }
+free_cnode:
+ last = cn;
+ cn = cn->next;
+ if (saved_bh) {
+ /*
+ * we incremented this to keep others from
+ * taking the buffer head away
+ */
+ put_bh(saved_bh);
+ if (atomic_read(&saved_bh->b_count) < 0) {
+ reiserfs_warning(s, "journal-945",
+ "saved_bh->b_count < 0");
+ }
+ }
+ }
+ if (count > 0) {
+ cn = jl->j_realblock;
+ while (cn) {
+ if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1011",
+ "cn->bh is NULL");
+ }
+
+ depth = reiserfs_write_unlock_nested(s);
+ __wait_on_buffer(cn->bh);
+ reiserfs_write_lock_nested(s, depth);
+
+ if (!cn->bh) {
+ reiserfs_panic(s, "journal-1012",
+ "cn->bh is NULL");
+ }
+ if (unlikely(!buffer_uptodate(cn->bh))) {
+#ifdef CONFIG_REISERFS_CHECK
+ reiserfs_warning(s, "journal-949",
+ "buffer write failed");
+#endif
+ err = -EIO;
+ }
+ /*
+ * note, we must clear the JDirty_wait bit
+ * after the up to date check, otherwise we
+ * race against our flushpage routine
+ */
+ BUG_ON(!test_clear_buffer_journal_dirty
+ (cn->bh));
+
+ /* drop one ref for us */
+ put_bh(cn->bh);
+ /* drop one ref for journal_mark_dirty */
+ release_buffer_page(cn->bh);
+ }
+ cn = cn->next;
+ }
+ }
+
+ if (err)
+ reiserfs_abort(s, -EIO,
+ "Write error while pushing transaction to disk in %s",
+ __func__);
+flush_older_and_return:
+
+ /*
+ * before we can update the journal header block, we _must_ flush all
+ * real blocks from all older transactions to disk. This is because
+ * once the header block is updated, this transaction will not be
+ * replayed after a crash
+ */
+ if (flushall) {
+ flush_older_journal_lists(s, jl);
+ }
+
+ err = journal->j_errno;
+ /*
+ * before we can remove everything from the hash tables for this
+ * transaction, we must make sure it can never be replayed
+ *
+ * since we are only called from do_journal_end, we know for sure there
+ * are no allocations going on while we are flushing journal lists. So,
+ * we only need to update the journal header block for the last list
+ * being flushed
+ */
+ if (!err && flushall) {
+ err =
+ update_journal_header_block(s,
+ (jl->j_start + jl->j_len +
+ 2) % SB_ONDISK_JOURNAL_SIZE(s),
+ jl->j_trans_id);
+ if (err)
+ reiserfs_abort(s, -EIO,
+ "Write error while updating journal header in %s",
+ __func__);
+ }
+ remove_all_from_journal_list(s, jl, 0);
+ list_del_init(&jl->j_list);
+ journal->j_num_lists--;
+ del_from_work_list(s, jl);
+
+ if (journal->j_last_flush_id != 0 &&
+ (jl->j_trans_id - journal->j_last_flush_id) != 1) {
+ reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
+ journal->j_last_flush_id, jl->j_trans_id);
+ }
+ journal->j_last_flush_id = jl->j_trans_id;
+
+ /*
+ * not strictly required since we are freeing the list, but it should
+ * help find code using dead lists later on
+ */
+ jl->j_len = 0;
+ atomic_set(&jl->j_nonzerolen, 0);
+ jl->j_start = 0;
+ jl->j_realblock = NULL;
+ jl->j_commit_bh = NULL;
+ jl->j_trans_id = 0;
+ jl->j_state = 0;
+ put_journal_list(s, jl);
+ if (flushall)
+ mutex_unlock(&journal->j_flush_mutex);
+ return err;
+}
+
+static int write_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl,
+ struct buffer_chunk *chunk)
+{
+ struct reiserfs_journal_cnode *cn;
+ int ret = 0;
+
+ jl->j_state |= LIST_TOUCHED;
+ del_from_work_list(s, jl);
+ if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
+ return 0;
+ }
+
+ cn = jl->j_realblock;
+ while (cn) {
+ /*
+ * if the blocknr == 0, this has been cleared from the hash,
+ * skip it
+ */
+ if (cn->blocknr == 0) {
+ goto next;
+ }
+ if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
+ struct buffer_head *tmp_bh;
+ /*
+ * we can race against journal_mark_freed when we try
+ * to lock_buffer(cn->bh), so we have to inc the buffer
+ * count, and recheck things after locking
+ */
+ tmp_bh = cn->bh;
+ get_bh(tmp_bh);
+ lock_buffer(tmp_bh);
+ if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
+ if (!buffer_journal_dirty(tmp_bh) ||
+ buffer_journal_prepared(tmp_bh))
+ BUG();
+ add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
+ ret++;
+ } else {
+ /* note, cn->bh might be null now */
+ unlock_buffer(tmp_bh);
+ }
+ put_bh(tmp_bh);
+ }
+next:
+ cn = cn->next;
+ cond_resched();
+ }
+ return ret;
+}
+
+/* used by flush_commit_list */
+static int dirty_one_transaction(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ struct reiserfs_journal_cnode *cn;
+ struct reiserfs_journal_list *pjl;
+ int ret = 0;
+
+ jl->j_state |= LIST_DIRTY;
+ cn = jl->j_realblock;
+ while (cn) {
+ /*
+ * look for a more recent transaction that logged this
+ * buffer. Only the most recent transaction with a buffer in
+ * it is allowed to send that buffer to disk
+ */
+ pjl = find_newer_jl_for_cn(cn);
+ if (!pjl && cn->blocknr && cn->bh
+ && buffer_journal_dirty(cn->bh)) {
+ BUG_ON(!can_dirty(cn));
+ /*
+ * if the buffer is prepared, it will either be logged
+ * or restored. If restored, we need to make sure
+ * it actually gets marked dirty
+ */
+ clear_buffer_journal_new(cn->bh);
+ if (buffer_journal_prepared(cn->bh)) {
+ set_buffer_journal_restore_dirty(cn->bh);
+ } else {
+ set_buffer_journal_test(cn->bh);
+ mark_buffer_dirty(cn->bh);
+ }
+ }
+ cn = cn->next;
+ }
+ return ret;
+}
+
+static int kupdate_transactions(struct super_block *s,
+ struct reiserfs_journal_list *jl,
+ struct reiserfs_journal_list **next_jl,
+ unsigned int *next_trans_id,
+ int num_blocks, int num_trans)
+{
+ int ret = 0;
+ int written = 0;
+ int transactions_flushed = 0;
+ unsigned int orig_trans_id = jl->j_trans_id;
+ struct buffer_chunk chunk;
+ struct list_head *entry;
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ chunk.nr = 0;
+
+ reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
+ if (!journal_list_still_alive(s, orig_trans_id)) {
+ goto done;
+ }
+
+ /*
+ * we've got j_flush_mutex held, nobody is going to delete any
+ * of these lists out from underneath us
+ */
+ while ((num_trans && transactions_flushed < num_trans) ||
+ (!num_trans && written < num_blocks)) {
+
+ if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
+ atomic_read(&jl->j_commit_left)
+ || !(jl->j_state & LIST_DIRTY)) {
+ del_from_work_list(s, jl);
+ break;
+ }
+ ret = write_one_transaction(s, jl, &chunk);
+
+ if (ret < 0)
+ goto done;
+ transactions_flushed++;
+ written += ret;
+ entry = jl->j_list.next;
+
+ /* did we wrap? */
+ if (entry == &journal->j_journal_list) {
+ break;
+ }
+ jl = JOURNAL_LIST_ENTRY(entry);
+
+ /* don't bother with older transactions */
+ if (jl->j_trans_id <= orig_trans_id)
+ break;
+ }
+ if (chunk.nr) {
+ write_chunk(&chunk);
+ }
+
+done:
+ mutex_unlock(&journal->j_flush_mutex);
+ return ret;
+}
+
+/*
+ * for o_sync and fsync heavy applications, they tend to use
+ * all the journa list slots with tiny transactions. These
+ * trigger lots and lots of calls to update the header block, which
+ * adds seeks and slows things down.
+ *
+ * This function tries to clear out a large chunk of the journal lists
+ * at once, which makes everything faster since only the newest journal
+ * list updates the header block
+ */
+static int flush_used_journal_lists(struct super_block *s,
+ struct reiserfs_journal_list *jl)
+{
+ unsigned long len = 0;
+ unsigned long cur_len;
+ int ret;
+ int i;
+ int limit = 256;
+ struct reiserfs_journal_list *tjl;
+ struct reiserfs_journal_list *flush_jl;
+ unsigned int trans_id;
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+
+ flush_jl = tjl = jl;
+
+ /* in data logging mode, try harder to flush a lot of blocks */
+ if (reiserfs_data_log(s))
+ limit = 1024;
+ /* flush for 256 transactions or limit blocks, whichever comes first */
+ for (i = 0; i < 256 && len < limit; i++) {
+ if (atomic_read(&tjl->j_commit_left) ||
+ tjl->j_trans_id < jl->j_trans_id) {
+ break;
+ }
+ cur_len = atomic_read(&tjl->j_nonzerolen);
+ if (cur_len > 0) {
+ tjl->j_state &= ~LIST_TOUCHED;
+ }
+ len += cur_len;
+ flush_jl = tjl;
+ if (tjl->j_list.next == &journal->j_journal_list)
+ break;
+ tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
+ }
+ get_journal_list(jl);
+ get_journal_list(flush_jl);
+
+ /*
+ * try to find a group of blocks we can flush across all the
+ * transactions, but only bother if we've actually spanned
+ * across multiple lists
+ */
+ if (flush_jl != jl) {
+ ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
+ }
+ flush_journal_list(s, flush_jl, 1);
+ put_journal_list(s, flush_jl);
+ put_journal_list(s, jl);
+ return 0;
+}
+
+/*
+ * removes any nodes in table with name block and dev as bh.
+ * only touchs the hnext and hprev pointers.
+ */
+void remove_journal_hash(struct super_block *sb,
+ struct reiserfs_journal_cnode **table,
+ struct reiserfs_journal_list *jl,
+ unsigned long block, int remove_freed)
+{
+ struct reiserfs_journal_cnode *cur;
+ struct reiserfs_journal_cnode **head;
+
+ head = &(journal_hash(table, sb, block));
+ if (!head) {
+ return;
+ }
+ cur = *head;
+ while (cur) {
+ if (cur->blocknr == block && cur->sb == sb
+ && (jl == NULL || jl == cur->jlist)
+ && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
+ if (cur->hnext) {
+ cur->hnext->hprev = cur->hprev;
+ }
+ if (cur->hprev) {
+ cur->hprev->hnext = cur->hnext;
+ } else {
+ *head = cur->hnext;
+ }
+ cur->blocknr = 0;
+ cur->sb = NULL;
+ cur->state = 0;
+ /*
+ * anybody who clears the cur->bh will also
+ * dec the nonzerolen
+ */
+ if (cur->bh && cur->jlist)
+ atomic_dec(&cur->jlist->j_nonzerolen);
+ cur->bh = NULL;
+ cur->jlist = NULL;
+ }
+ cur = cur->hnext;
+ }
+}
+
+static void free_journal_ram(struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ kfree(journal->j_current_jl);
+ journal->j_num_lists--;
+
+ vfree(journal->j_cnode_free_orig);
+ free_list_bitmaps(sb, journal->j_list_bitmap);
+ free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
+ if (journal->j_header_bh) {
+ brelse(journal->j_header_bh);
+ }
+ /*
+ * j_header_bh is on the journal dev, make sure
+ * not to release the journal dev until we brelse j_header_bh
+ */
+ release_journal_dev(sb, journal);
+ vfree(journal);
+}
+
+/*
+ * call on unmount. Only set error to 1 if you haven't made your way out
+ * of read_super() yet. Any other caller must keep error at 0.
+ */
+static int do_journal_release(struct reiserfs_transaction_handle *th,
+ struct super_block *sb, int error)
+{
+ struct reiserfs_transaction_handle myth;
+ int flushed = 0;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+
+ /*
+ * we only want to flush out transactions if we were
+ * called with error == 0
+ */
+ if (!error && !(sb->s_flags & MS_RDONLY)) {
+ /* end the current trans */
+ BUG_ON(!th->t_trans_id);
+ do_journal_end(th, FLUSH_ALL);
+
+ /*
+ * make sure something gets logged to force
+ * our way into the flush code
+ */
+ if (!journal_join(&myth, sb)) {
+ reiserfs_prepare_for_journal(sb,
+ SB_BUFFER_WITH_SB(sb),
+ 1);
+ journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
+ do_journal_end(&myth, FLUSH_ALL);
+ flushed = 1;
+ }
+ }
+
+ /* this also catches errors during the do_journal_end above */
+ if (!error && reiserfs_is_journal_aborted(journal)) {
+ memset(&myth, 0, sizeof(myth));
+ if (!journal_join_abort(&myth, sb)) {
+ reiserfs_prepare_for_journal(sb,
+ SB_BUFFER_WITH_SB(sb),
+ 1);
+ journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
+ do_journal_end(&myth, FLUSH_ALL);
+ }
+ }
+
+
+ /*
+ * We must release the write lock here because
+ * the workqueue job (flush_async_commit) needs this lock
+ */
+ reiserfs_write_unlock(sb);
+
+ /*
+ * Cancel flushing of old commits. Note that neither of these works
+ * will be requeued because superblock is being shutdown and doesn't
+ * have MS_ACTIVE set.
+ */
+ cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
+ /* wait for all commits to finish */
+ cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
+
+ free_journal_ram(sb);
+
+ reiserfs_write_lock(sb);
+
+ return 0;
+}
+
+/* * call on unmount. flush all journal trans, release all alloc'd ram */
+int journal_release(struct reiserfs_transaction_handle *th,
+ struct super_block *sb)
+{
+ return do_journal_release(th, sb, 0);
+}
+
+/* only call from an error condition inside reiserfs_read_super! */
+int journal_release_error(struct reiserfs_transaction_handle *th,
+ struct super_block *sb)
+{
+ return do_journal_release(th, sb, 1);
+}
+
+/*
+ * compares description block with commit block.
+ * returns 1 if they differ, 0 if they are the same
+ */
+static int journal_compare_desc_commit(struct super_block *sb,
+ struct reiserfs_journal_desc *desc,
+ struct reiserfs_journal_commit *commit)
+{
+ if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
+ get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
+ get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
+ get_commit_trans_len(commit) <= 0) {
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * returns 0 if it did not find a description block
+ * returns -1 if it found a corrupt commit block
+ * returns 1 if both desc and commit were valid
+ * NOTE: only called during fs mount
+ */
+static int journal_transaction_is_valid(struct super_block *sb,
+ struct buffer_head *d_bh,
+ unsigned int *oldest_invalid_trans_id,
+ unsigned long *newest_mount_id)
+{
+ struct reiserfs_journal_desc *desc;
+ struct reiserfs_journal_commit *commit;
+ struct buffer_head *c_bh;
+ unsigned long offset;
+
+ if (!d_bh)
+ return 0;
+
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data;
+ if (get_desc_trans_len(desc) > 0
+ && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
+ if (oldest_invalid_trans_id && *oldest_invalid_trans_id
+ && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-986: transaction "
+ "is valid returning because trans_id %d is greater than "
+ "oldest_invalid %lu",
+ get_desc_trans_id(desc),
+ *oldest_invalid_trans_id);
+ return 0;
+ }
+ if (newest_mount_id
+ && *newest_mount_id > get_desc_mount_id(desc)) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1087: transaction "
+ "is valid returning because mount_id %d is less than "
+ "newest_mount_id %lu",
+ get_desc_mount_id(desc),
+ *newest_mount_id);
+ return -1;
+ }
+ if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
+ reiserfs_warning(sb, "journal-2018",
+ "Bad transaction length %d "
+ "encountered, ignoring transaction",
+ get_desc_trans_len(desc));
+ return -1;
+ }
+ offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
+
+ /*
+ * ok, we have a journal description block,
+ * let's see if the transaction was valid
+ */
+ c_bh =
+ journal_bread(sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ ((offset + get_desc_trans_len(desc) +
+ 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
+ if (!c_bh)
+ return 0;
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data;
+ if (journal_compare_desc_commit(sb, desc, commit)) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal_transaction_is_valid, commit offset %ld had bad "
+ "time %d or length %d",
+ c_bh->b_blocknr -
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ get_commit_trans_id(commit),
+ get_commit_trans_len(commit));
+ brelse(c_bh);
+ if (oldest_invalid_trans_id) {
+ *oldest_invalid_trans_id =
+ get_desc_trans_id(desc);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1004: "
+ "transaction_is_valid setting oldest invalid trans_id "
+ "to %d",
+ get_desc_trans_id(desc));
+ }
+ return -1;
+ }
+ brelse(c_bh);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1006: found valid "
+ "transaction start offset %llu, len %d id %d",
+ d_bh->b_blocknr -
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ get_desc_trans_len(desc),
+ get_desc_trans_id(desc));
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+static void brelse_array(struct buffer_head **heads, int num)
+{
+ int i;
+ for (i = 0; i < num; i++) {
+ brelse(heads[i]);
+ }
+}
+
+/*
+ * given the start, and values for the oldest acceptable transactions,
+ * this either reads in a replays a transaction, or returns because the
+ * transaction is invalid, or too old.
+ * NOTE: only called during fs mount
+ */
+static int journal_read_transaction(struct super_block *sb,
+ unsigned long cur_dblock,
+ unsigned long oldest_start,
+ unsigned int oldest_trans_id,
+ unsigned long newest_mount_id)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_journal_desc *desc;
+ struct reiserfs_journal_commit *commit;
+ unsigned int trans_id = 0;
+ struct buffer_head *c_bh;
+ struct buffer_head *d_bh;
+ struct buffer_head **log_blocks = NULL;
+ struct buffer_head **real_blocks = NULL;
+ unsigned int trans_offset;
+ int i;
+ int trans_half;
+
+ d_bh = journal_bread(sb, cur_dblock);
+ if (!d_bh)
+ return 1;
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data;
+ trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
+ "journal_read_transaction, offset %llu, len %d mount_id %d",
+ d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ get_desc_trans_len(desc), get_desc_mount_id(desc));
+ if (get_desc_trans_id(desc) < oldest_trans_id) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
+ "journal_read_trans skipping because %lu is too old",
+ cur_dblock -
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb));
+ brelse(d_bh);
+ return 1;
+ }
+ if (get_desc_mount_id(desc) != newest_mount_id) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
+ "journal_read_trans skipping because %d is != "
+ "newest_mount_id %lu", get_desc_mount_id(desc),
+ newest_mount_id);
+ brelse(d_bh);
+ return 1;
+ }
+ c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ ((trans_offset + get_desc_trans_len(desc) + 1) %
+ SB_ONDISK_JOURNAL_SIZE(sb)));
+ if (!c_bh) {
+ brelse(d_bh);
+ return 1;
+ }
+ commit = (struct reiserfs_journal_commit *)c_bh->b_data;
+ if (journal_compare_desc_commit(sb, desc, commit)) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal_read_transaction, "
+ "commit offset %llu had bad time %d or length %d",
+ c_bh->b_blocknr -
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ get_commit_trans_id(commit),
+ get_commit_trans_len(commit));
+ brelse(c_bh);
+ brelse(d_bh);
+ return 1;
+ }
+
+ if (bdev_read_only(sb->s_bdev)) {
+ reiserfs_warning(sb, "clm-2076",
+ "device is readonly, unable to replay log");
+ brelse(c_bh);
+ brelse(d_bh);
+ return -EROFS;
+ }
+
+ trans_id = get_desc_trans_id(desc);
+ /*
+ * now we know we've got a good transaction, and it was
+ * inside the valid time ranges
+ */
+ log_blocks = kmalloc(get_desc_trans_len(desc) *
+ sizeof(struct buffer_head *), GFP_NOFS);
+ real_blocks = kmalloc(get_desc_trans_len(desc) *
+ sizeof(struct buffer_head *), GFP_NOFS);
+ if (!log_blocks || !real_blocks) {
+ brelse(c_bh);
+ brelse(d_bh);
+ kfree(log_blocks);
+ kfree(real_blocks);
+ reiserfs_warning(sb, "journal-1169",
+ "kmalloc failed, unable to mount FS");
+ return -1;
+ }
+ /* get all the buffer heads */
+ trans_half = journal_trans_half(sb->s_blocksize);
+ for (i = 0; i < get_desc_trans_len(desc); i++) {
+ log_blocks[i] =
+ journal_getblk(sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ (trans_offset + 1 +
+ i) % SB_ONDISK_JOURNAL_SIZE(sb));
+ if (i < trans_half) {
+ real_blocks[i] =
+ sb_getblk(sb,
+ le32_to_cpu(desc->j_realblock[i]));
+ } else {
+ real_blocks[i] =
+ sb_getblk(sb,
+ le32_to_cpu(commit->
+ j_realblock[i - trans_half]));
+ }
+ if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
+ reiserfs_warning(sb, "journal-1207",
+ "REPLAY FAILURE fsck required! "
+ "Block to replay is outside of "
+ "filesystem");
+ goto abort_replay;
+ }
+ /* make sure we don't try to replay onto log or reserved area */
+ if (is_block_in_log_or_reserved_area
+ (sb, real_blocks[i]->b_blocknr)) {
+ reiserfs_warning(sb, "journal-1204",
+ "REPLAY FAILURE fsck required! "
+ "Trying to replay onto a log block");
+abort_replay:
+ brelse_array(log_blocks, i);
+ brelse_array(real_blocks, i);
+ brelse(c_bh);
+ brelse(d_bh);
+ kfree(log_blocks);
+ kfree(real_blocks);
+ return -1;
+ }
+ }
+ /* read in the log blocks, memcpy to the corresponding real block */
+ ll_rw_block(READ, 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], WRITE);
+ }
+ for (i = 0; i < get_desc_trans_len(desc); i++) {
+ wait_on_buffer(real_blocks[i]);
+ if (!buffer_uptodate(real_blocks[i])) {
+ reiserfs_warning(sb, "journal-1226",
+ "REPLAY FAILURE, fsck required! "
+ "buffer write failed");
+ brelse_array(real_blocks + i,
+ get_desc_trans_len(desc) - i);
+ brelse(c_bh);
+ brelse(d_bh);
+ kfree(log_blocks);
+ kfree(real_blocks);
+ return -1;
+ }
+ brelse(real_blocks[i]);
+ }
+ cur_dblock =
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ ((trans_offset + get_desc_trans_len(desc) +
+ 2) % SB_ONDISK_JOURNAL_SIZE(sb));
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1095: setting journal " "start to offset %ld",
+ cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
+
+ /*
+ * init starting values for the first transaction, in case
+ * this is the last transaction to be replayed.
+ */
+ journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
+ journal->j_last_flush_trans_id = trans_id;
+ journal->j_trans_id = trans_id + 1;
+ /* check for trans_id overflow */
+ if (journal->j_trans_id == 0)
+ journal->j_trans_id = 10;
+ brelse(c_bh);
+ brelse(d_bh);
+ kfree(log_blocks);
+ kfree(real_blocks);
+ return 0;
+}
+
+/*
+ * This function reads blocks starting from block and to max_block of bufsize
+ * size (but no more than BUFNR blocks at a time). This proved to improve
+ * mounting speed on self-rebuilding raid5 arrays at least.
+ * Right now it is only used from journal code. But later we might use it
+ * from other places.
+ * Note: Do not use journal_getblk/sb_getblk functions here!
+ */
+static struct buffer_head *reiserfs_breada(struct block_device *dev,
+ b_blocknr_t block, int bufsize,
+ b_blocknr_t max_block)
+{
+ struct buffer_head *bhlist[BUFNR];
+ unsigned int blocks = BUFNR;
+ struct buffer_head *bh;
+ int i, j;
+
+ bh = __getblk(dev, block, bufsize);
+ if (buffer_uptodate(bh))
+ return (bh);
+
+ if (block + BUFNR > max_block) {
+ blocks = max_block - block;
+ }
+ bhlist[0] = bh;
+ j = 1;
+ for (i = 1; i < blocks; i++) {
+ bh = __getblk(dev, block + i, bufsize);
+ if (buffer_uptodate(bh)) {
+ brelse(bh);
+ break;
+ } else
+ bhlist[j++] = bh;
+ }
+ ll_rw_block(READ, j, bhlist);
+ for (i = 1; i < j; i++)
+ brelse(bhlist[i]);
+ bh = bhlist[0];
+ wait_on_buffer(bh);
+ if (buffer_uptodate(bh))
+ return bh;
+ brelse(bh);
+ return NULL;
+}
+
+/*
+ * read and replay the log
+ * on a clean unmount, the journal header's next unflushed pointer will be
+ * to an invalid transaction. This tests that before finding all the
+ * transactions in the log, which makes normal mount times fast.
+ *
+ * After a crash, this starts with the next unflushed transaction, and
+ * replays until it finds one too old, or invalid.
+ *
+ * On exit, it sets things up so the first transaction will work correctly.
+ * NOTE: only called during fs mount
+ */
+static int journal_read(struct super_block *sb)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_journal_desc *desc;
+ unsigned int oldest_trans_id = 0;
+ unsigned int oldest_invalid_trans_id = 0;
+ time_t start;
+ unsigned long oldest_start = 0;
+ unsigned long cur_dblock = 0;
+ unsigned long newest_mount_id = 9;
+ struct buffer_head *d_bh;
+ struct reiserfs_journal_header *jh;
+ int valid_journal_header = 0;
+ int replay_count = 0;
+ int continue_replay = 1;
+ int ret;
+ char b[BDEVNAME_SIZE];
+
+ cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
+ reiserfs_info(sb, "checking transaction log (%s)\n",
+ bdevname(journal->j_dev_bd, b));
+ start = get_seconds();
+
+ /*
+ * step 1, read in the journal header block. Check the transaction
+ * it says is the first unflushed, and if that transaction is not
+ * valid, replay is done
+ */
+ journal->j_header_bh = journal_bread(sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb)
+ + SB_ONDISK_JOURNAL_SIZE(sb));
+ if (!journal->j_header_bh) {
+ return 1;
+ }
+ jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
+ if (le32_to_cpu(jh->j_first_unflushed_offset) <
+ SB_ONDISK_JOURNAL_SIZE(sb)
+ && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
+ oldest_start =
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ le32_to_cpu(jh->j_first_unflushed_offset);
+ oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
+ newest_mount_id = le32_to_cpu(jh->j_mount_id);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1153: found in "
+ "header: first_unflushed_offset %d, last_flushed_trans_id "
+ "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
+ le32_to_cpu(jh->j_last_flush_trans_id));
+ valid_journal_header = 1;
+
+ /*
+ * now, we try to read the first unflushed offset. If it
+ * is not valid, there is nothing more we can do, and it
+ * makes no sense to read through the whole log.
+ */
+ d_bh =
+ journal_bread(sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ le32_to_cpu(jh->j_first_unflushed_offset));
+ ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
+ if (!ret) {
+ continue_replay = 0;
+ }
+ brelse(d_bh);
+ goto start_log_replay;
+ }
+
+ /*
+ * ok, there are transactions that need to be replayed. start
+ * with the first log block, find all the valid transactions, and
+ * pick out the oldest.
+ */
+ while (continue_replay
+ && cur_dblock <
+ (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ SB_ONDISK_JOURNAL_SIZE(sb))) {
+ /*
+ * Note that it is required for blocksize of primary fs
+ * device and journal device to be the same
+ */
+ d_bh =
+ reiserfs_breada(journal->j_dev_bd, cur_dblock,
+ sb->s_blocksize,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ SB_ONDISK_JOURNAL_SIZE(sb));
+ ret =
+ journal_transaction_is_valid(sb, d_bh,
+ &oldest_invalid_trans_id,
+ &newest_mount_id);
+ if (ret == 1) {
+ desc = (struct reiserfs_journal_desc *)d_bh->b_data;
+ if (oldest_start == 0) { /* init all oldest_ values */
+ oldest_trans_id = get_desc_trans_id(desc);
+ oldest_start = d_bh->b_blocknr;
+ newest_mount_id = get_desc_mount_id(desc);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1179: Setting "
+ "oldest_start to offset %llu, trans_id %lu",
+ oldest_start -
+ SB_ONDISK_JOURNAL_1st_BLOCK
+ (sb), oldest_trans_id);
+ } else if (oldest_trans_id > get_desc_trans_id(desc)) {
+ /* one we just read was older */
+ oldest_trans_id = get_desc_trans_id(desc);
+ oldest_start = d_bh->b_blocknr;
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1180: Resetting "
+ "oldest_start to offset %lu, trans_id %lu",
+ oldest_start -
+ SB_ONDISK_JOURNAL_1st_BLOCK
+ (sb), oldest_trans_id);
+ }
+ if (newest_mount_id < get_desc_mount_id(desc)) {
+ newest_mount_id = get_desc_mount_id(desc);
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1299: Setting "
+ "newest_mount_id to %d",
+ get_desc_mount_id(desc));
+ }
+ cur_dblock += get_desc_trans_len(desc) + 2;
+ } else {
+ cur_dblock++;
+ }
+ brelse(d_bh);
+ }
+
+start_log_replay:
+ cur_dblock = oldest_start;
+ if (oldest_trans_id) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1206: Starting replay "
+ "from offset %llu, trans_id %lu",
+ cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ oldest_trans_id);
+
+ }
+ replay_count = 0;
+ while (continue_replay && oldest_trans_id > 0) {
+ ret =
+ journal_read_transaction(sb, cur_dblock, oldest_start,
+ oldest_trans_id, newest_mount_id);
+ if (ret < 0) {
+ return ret;
+ } else if (ret != 0) {
+ break;
+ }
+ cur_dblock =
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
+ replay_count++;
+ if (cur_dblock == oldest_start)
+ break;
+ }
+
+ if (oldest_trans_id == 0) {
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "journal-1225: No valid " "transactions found");
+ }
+ /*
+ * j_start does not get set correctly if we don't replay any
+ * transactions. if we had a valid journal_header, set j_start
+ * to the first unflushed transaction value, copy the trans_id
+ * from the header
+ */
+ if (valid_journal_header && replay_count == 0) {
+ journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
+ journal->j_trans_id =
+ le32_to_cpu(jh->j_last_flush_trans_id) + 1;
+ /* check for trans_id overflow */
+ if (journal->j_trans_id == 0)
+ journal->j_trans_id = 10;
+ journal->j_last_flush_trans_id =
+ le32_to_cpu(jh->j_last_flush_trans_id);
+ journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
+ } else {
+ journal->j_mount_id = newest_mount_id + 1;
+ }
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
+ "newest_mount_id to %lu", journal->j_mount_id);
+ journal->j_first_unflushed_offset = journal->j_start;
+ if (replay_count > 0) {
+ reiserfs_info(sb,
+ "replayed %d transactions in %lu seconds\n",
+ replay_count, get_seconds() - start);
+ }
+ /* needed to satisfy the locking in _update_journal_header_block */
+ reiserfs_write_lock(sb);
+ if (!bdev_read_only(sb->s_bdev) &&
+ _update_journal_header_block(sb, journal->j_start,
+ journal->j_last_flush_trans_id)) {
+ reiserfs_write_unlock(sb);
+ /*
+ * replay failed, caller must call free_journal_ram and abort
+ * the mount
+ */
+ return -1;
+ }
+ reiserfs_write_unlock(sb);
+ return 0;
+}
+
+static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
+{
+ struct reiserfs_journal_list *jl;
+ jl = kzalloc(sizeof(struct reiserfs_journal_list),
+ GFP_NOFS | __GFP_NOFAIL);
+ INIT_LIST_HEAD(&jl->j_list);
+ INIT_LIST_HEAD(&jl->j_working_list);
+ INIT_LIST_HEAD(&jl->j_tail_bh_list);
+ INIT_LIST_HEAD(&jl->j_bh_list);
+ mutex_init(&jl->j_commit_mutex);
+ SB_JOURNAL(s)->j_num_lists++;
+ get_journal_list(jl);
+ return jl;
+}
+
+static void journal_list_init(struct super_block *sb)
+{
+ SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
+}
+
+static void release_journal_dev(struct super_block *super,
+ struct reiserfs_journal *journal)
+{
+ if (journal->j_dev_bd != NULL) {
+ blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
+ journal->j_dev_bd = NULL;
+ }
+}
+
+static int journal_init_dev(struct super_block *super,
+ struct reiserfs_journal *journal,
+ const char *jdev_name)
+{
+ int result;
+ dev_t jdev;
+ fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
+ char b[BDEVNAME_SIZE];
+
+ result = 0;
+
+ journal->j_dev_bd = NULL;
+ jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
+ new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
+
+ if (bdev_read_only(super->s_bdev))
+ blkdev_mode = FMODE_READ;
+
+ /* there is no "jdev" option and journal is on separate device */
+ if ((!jdev_name || !jdev_name[0])) {
+ if (jdev == super->s_dev)
+ blkdev_mode &= ~FMODE_EXCL;
+ journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
+ journal);
+ journal->j_dev_mode = blkdev_mode;
+ if (IS_ERR(journal->j_dev_bd)) {
+ result = PTR_ERR(journal->j_dev_bd);
+ journal->j_dev_bd = NULL;
+ reiserfs_warning(super, "sh-458",
+ "cannot init journal device '%s': %i",
+ __bdevname(jdev, b), result);
+ return result;
+ } else if (jdev != super->s_dev)
+ set_blocksize(journal->j_dev_bd, super->s_blocksize);
+
+ return 0;
+ }
+
+ journal->j_dev_mode = blkdev_mode;
+ journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
+ if (IS_ERR(journal->j_dev_bd)) {
+ result = PTR_ERR(journal->j_dev_bd);
+ journal->j_dev_bd = NULL;
+ reiserfs_warning(super,
+ "journal_init_dev: Cannot open '%s': %i",
+ jdev_name, result);
+ return result;
+ }
+
+ set_blocksize(journal->j_dev_bd, super->s_blocksize);
+ reiserfs_info(super,
+ "journal_init_dev: journal device: %s\n",
+ bdevname(journal->j_dev_bd, b));
+ 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;
+ char b[BDEVNAME_SIZE];
+ int ret;
+
+ journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
+ if (!journal) {
+ reiserfs_warning(sb, "journal-1256",
+ "unable to get memory for journal structure");
+ return 1;
+ }
+ INIT_LIST_HEAD(&journal->j_bitmap_nodes);
+ INIT_LIST_HEAD(&journal->j_prealloc_list);
+ INIT_LIST_HEAD(&journal->j_working_list);
+ INIT_LIST_HEAD(&journal->j_journal_list);
+ journal->j_persistent_trans = 0;
+ if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
+ reiserfs_bmap_count(sb)))
+ goto free_and_return;
+
+ allocate_bitmap_nodes(sb);
+
+ /* reserved for journal area support */
+ SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
+ REISERFS_OLD_DISK_OFFSET_IN_BYTES
+ / sb->s_blocksize +
+ reiserfs_bmap_count(sb) +
+ 1 :
+ REISERFS_DISK_OFFSET_IN_BYTES /
+ sb->s_blocksize + 2);
+
+ /*
+ * Sanity check to see is the standard journal fitting
+ * within first bitmap (actual for small blocksizes)
+ */
+ if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
+ (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
+ SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
+ reiserfs_warning(sb, "journal-1393",
+ "journal does not fit for area addressed "
+ "by first of bitmap blocks. It starts at "
+ "%u and its size is %u. Block size %ld",
+ SB_JOURNAL_1st_RESERVED_BLOCK(sb),
+ SB_ONDISK_JOURNAL_SIZE(sb),
+ sb->s_blocksize);
+ goto free_and_return;
+ }
+
+ if (journal_init_dev(sb, journal, j_dev_name) != 0) {
+ reiserfs_warning(sb, "sh-462",
+ "unable to initialize journal device");
+ goto free_and_return;
+ }
+
+ rs = SB_DISK_SUPER_BLOCK(sb);
+
+ /* read journal header */
+ bhjh = journal_bread(sb,
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
+ SB_ONDISK_JOURNAL_SIZE(sb));
+ if (!bhjh) {
+ reiserfs_warning(sb, "sh-459",
+ "unable to read journal header");
+ goto free_and_return;
+ }
+ jh = (struct reiserfs_journal_header *)(bhjh->b_data);
+
+ /* make sure that journal matches to the super block */
+ if (is_reiserfs_jr(rs)
+ && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
+ sb_jp_journal_magic(rs))) {
+ reiserfs_warning(sb, "sh-460",
+ "journal header magic %x (device %s) does "
+ "not match to magic found in super block %x",
+ jh->jh_journal.jp_journal_magic,
+ bdevname(journal->j_dev_bd, b),
+ 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 %s, size %u, "
+ "journal first block %u, max trans len %u, max batch %u, "
+ "max commit age %u, max trans age %u\n",
+ bdevname(journal->j_dev_bd, b),
+ SB_ONDISK_JOURNAL_SIZE(sb),
+ SB_ONDISK_JOURNAL_1st_BLOCK(sb),
+ journal->j_trans_max,
+ journal->j_max_batch,
+ journal->j_max_commit_age, journal->j_max_trans_age);
+
+ brelse(bhjh);
+
+ journal->j_list_bitmap_index = 0;
+ journal_list_init(sb);
+
+ memset(journal->j_list_hash_table, 0,
+ JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
+
+ INIT_LIST_HEAD(&journal->j_dirty_buffers);
+ spin_lock_init(&journal->j_dirty_buffers_lock);
+
+ journal->j_start = 0;
+ journal->j_len = 0;
+ journal->j_len_alloc = 0;
+ atomic_set(&journal->j_wcount, 0);
+ atomic_set(&journal->j_async_throttle, 0);
+ journal->j_bcount = 0;
+ journal->j_trans_start_time = 0;
+ journal->j_last = NULL;
+ journal->j_first = NULL;
+ init_waitqueue_head(&journal->j_join_wait);
+ mutex_init(&journal->j_mutex);
+ mutex_init(&journal->j_flush_mutex);
+
+ journal->j_trans_id = 10;
+ journal->j_mount_id = 10;
+ journal->j_state = 0;
+ atomic_set(&journal->j_jlock, 0);
+ journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
+ journal->j_cnode_free_orig = journal->j_cnode_free_list;
+ journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
+ journal->j_cnode_used = 0;
+ journal->j_must_wait = 0;
+
+ if (journal->j_cnode_free == 0) {
+ reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
+ "allocation failed (%ld bytes). Journal is "
+ "too large for available memory. Usually "
+ "this is due to a journal that is too large.",
+ sizeof (struct reiserfs_journal_cnode) * num_cnodes);
+ goto free_and_return;
+ }
+
+ init_journal_hash(sb);
+ jl = journal->j_current_jl;
+
+ /*
+ * get_list_bitmap() may call flush_commit_list() which
+ * requires the lock. Calling flush_commit_list() shouldn't happen
+ * this early but I like to be paranoid.
+ */
+ reiserfs_write_lock(sb);
+ jl->j_list_bitmap = get_list_bitmap(sb, jl);
+ reiserfs_write_unlock(sb);
+ if (!jl->j_list_bitmap) {
+ reiserfs_warning(sb, "journal-2005",
+ "get_list_bitmap failed for journal list 0");
+ goto free_and_return;
+ }
+
+ ret = journal_read(sb);
+ if (ret < 0) {
+ reiserfs_warning(sb, "reiserfs-2006",
+ "Replay Failure, unable to mount");
+ goto free_and_return;
+ }
+
+ INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
+ journal->j_work_sb = sb;
+ return 0;
+free_and_return:
+ free_journal_ram(sb);
+ return 1;
+}
+
+/*
+ * test for a polite end of the current transaction. Used by file_write,
+ * and should be used by delete to make sure they don't write more than
+ * can fit inside a single transaction
+ */
+int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
+ int new_alloc)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
+ time_t now = get_seconds();
+ /* cannot restart while nested */
+ BUG_ON(!th->t_trans_id);
+ if (th->t_refcount > 1)
+ return 0;
+ if (journal->j_must_wait > 0 ||
+ (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
+ atomic_read(&journal->j_jlock) ||
+ (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
+ journal->j_cnode_free < (journal->j_trans_max * 3)) {
+ return 1;
+ }
+
+ journal->j_len_alloc += new_alloc;
+ th->t_blocks_allocated += new_alloc ;
+ return 0;
+}
+
+/* this must be called inside a transaction */
+void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
+ BUG_ON(!th->t_trans_id);
+ journal->j_must_wait = 1;
+ set_bit(J_WRITERS_BLOCKED, &journal->j_state);
+ return;
+}
+
+/* this must be called without a transaction started */
+void reiserfs_allow_writes(struct super_block *s)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
+ wake_up(&journal->j_join_wait);
+}
+
+/* this must be called without a transaction started */
+void reiserfs_wait_on_write_block(struct super_block *s)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ wait_event(journal->j_join_wait,
+ !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
+}
+
+static void queue_log_writer(struct super_block *s)
+{
+ wait_queue_t wait;
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ set_bit(J_WRITERS_QUEUED, &journal->j_state);
+
+ /*
+ * we don't want to use wait_event here because
+ * we only want to wait once.
+ */
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&journal->j_join_wait, &wait);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
+ int depth = reiserfs_write_unlock_nested(s);
+ schedule();
+ reiserfs_write_lock_nested(s, depth);
+ }
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&journal->j_join_wait, &wait);
+}
+
+static void wake_queued_writers(struct super_block *s)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(s);
+ if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
+ wake_up(&journal->j_join_wait);
+}
+
+static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
+{
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ unsigned long bcount = journal->j_bcount;
+ while (1) {
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(sb);
+ schedule_timeout_uninterruptible(1);
+ reiserfs_write_lock_nested(sb, depth);
+
+ journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
+ while ((atomic_read(&journal->j_wcount) > 0 ||
+ atomic_read(&journal->j_jlock)) &&
+ journal->j_trans_id == trans_id) {
+ queue_log_writer(sb);
+ }
+ if (journal->j_trans_id != trans_id)
+ break;
+ if (bcount == journal->j_bcount)
+ break;
+ bcount = journal->j_bcount;
+ }
+}
+
+/*
+ * join == true if you must join an existing transaction.
+ * join == false if you can deal with waiting for others to finish
+ *
+ * this will block until the transaction is joinable. send the number of
+ * blocks you expect to use in nblocks.
+*/
+static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
+ struct super_block *sb, unsigned long nblocks,
+ int join)
+{
+ time_t now = get_seconds();
+ unsigned int old_trans_id;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ struct reiserfs_transaction_handle myth;
+ int sched_count = 0;
+ int retval;
+ int depth;
+
+ reiserfs_check_lock_depth(sb, "journal_begin");
+ BUG_ON(nblocks > journal->j_trans_max);
+
+ PROC_INFO_INC(sb, journal.journal_being);
+ /* set here for journal_join */
+ th->t_refcount = 1;
+ th->t_super = sb;
+
+relock:
+ lock_journal(sb);
+ if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
+ unlock_journal(sb);
+ retval = journal->j_errno;
+ goto out_fail;
+ }
+ journal->j_bcount++;
+
+ if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
+ unlock_journal(sb);
+ depth = reiserfs_write_unlock_nested(sb);
+ reiserfs_wait_on_write_block(sb);
+ reiserfs_write_lock_nested(sb, depth);
+ PROC_INFO_INC(sb, journal.journal_relock_writers);
+ goto relock;
+ }
+ now = get_seconds();
+
+ /*
+ * if there is no room in the journal OR
+ * if this transaction is too old, and we weren't called joinable,
+ * wait for it to finish before beginning we don't sleep if there
+ * aren't other writers
+ */
+
+ if ((!join && journal->j_must_wait > 0) ||
+ (!join
+ && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
+ || (!join && atomic_read(&journal->j_wcount) > 0
+ && journal->j_trans_start_time > 0
+ && (now - journal->j_trans_start_time) >
+ journal->j_max_trans_age) || (!join
+ && atomic_read(&journal->j_jlock))
+ || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
+
+ old_trans_id = journal->j_trans_id;
+ /* allow others to finish this transaction */
+ unlock_journal(sb);
+
+ if (!join && (journal->j_len_alloc + nblocks + 2) >=
+ journal->j_max_batch &&
+ ((journal->j_len + nblocks + 2) * 100) <
+ (journal->j_len_alloc * 75)) {
+ if (atomic_read(&journal->j_wcount) > 10) {
+ sched_count++;
+ queue_log_writer(sb);
+ goto relock;
+ }
+ }
+ /*
+ * don't mess with joining the transaction if all we
+ * have to do is wait for someone else to do a commit
+ */
+ if (atomic_read(&journal->j_jlock)) {
+ while (journal->j_trans_id == old_trans_id &&
+ atomic_read(&journal->j_jlock)) {
+ queue_log_writer(sb);
+ }
+ goto relock;
+ }
+ retval = journal_join(&myth, sb);
+ if (retval)
+ goto out_fail;
+
+ /* someone might have ended the transaction while we joined */
+ if (old_trans_id != journal->j_trans_id) {
+ retval = do_journal_end(&myth, 0);
+ } else {
+ retval = do_journal_end(&myth, COMMIT_NOW);
+ }
+
+ 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 = 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;
+ }
+ if (bh)
+ 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)
+{
+ time_t now;
+ struct reiserfs_transaction_handle th;
+ struct reiserfs_journal *journal = SB_JOURNAL(sb);
+
+ now = 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)
+{
+
+ time_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 = 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 old_start;
+ 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 */
+ old_start = journal->j_start;
+ 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 & MS_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 |= MS_RDONLY;
+ set_bit(J_ABORTED, &journal->j_state);
+
+#ifdef CONFIG_REISERFS_CHECK
+ dump_stack();
+#endif
+}
Code Review / kvmfornfv.git / blobdiff