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linux / linux / kernel / git / torvalds / linux / refs/tags/v2.6.13-rc2 / . / fs / reiserfs / journal.c
blob: d1bcf0da6728abf99fb37e456f7b95475b1e2b48 [file] [log] [blame]
/*
** Write ahead logging implementation copyright Chris Mason 2000
**
** The background commits make this code very interelated, and
** overly complex. I need to rethink things a bit....The major players:
**
** journal_begin -- call with the number of blocks you expect to log.
** If the current transaction is too
** old, it will block until the current transaction is
** finished, and then start a new one.
** Usually, your transaction will get joined in with
** previous ones for speed.
**
** journal_join -- same as journal_begin, but won't block on the current
** transaction regardless of age. Don't ever call
** this. Ever. There are only two places it should be
** called from, and they are both inside this file.
**
** journal_mark_dirty -- adds blocks into this transaction. clears any flags
** that might make them get sent to disk
** and then marks them BH_JDirty. Puts the buffer head
** into the current transaction hash.
**
** journal_end -- if the current transaction is batchable, it does nothing
** otherwise, it could do an async/synchronous commit, or
** a full flush of all log and real blocks in the
** transaction.
**
** flush_old_commits -- if the current transaction is too old, it is ended and
** commit blocks are sent to disk. Forces commit blocks
** to disk for all backgrounded commits that have been
** around too long.
** -- Note, if you call this as an immediate flush from
** from within kupdate, it will ignore the immediate flag
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/time.h>
#include <asm/semaphore.h>
#include <linux/vmalloc.h>
#include <linux/reiserfs_fs.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/workqueue.h>
#include <linux/writeback.h>
#include <linux/blkdev.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))
/* the number of mounted filesystems. This is used to decide when to
** start and kill the commit workqueue
*/
static int reiserfs_mounted_fs_count;
static struct workqueue_struct *commit_wq;
#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit
structs at 4k */
#define BUFNR 64 /*read ahead */
/* cnode stat bits. Move these into reiserfs_fs.h */
#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
#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 *,struct super_block *,unsigned long nblocks,int flags) ;
static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
static int can_dirty(struct reiserfs_journal_cnode *cn) ;
static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks);
static int release_journal_dev( struct super_block *super,
struct reiserfs_journal *journal );
static int dirty_one_transaction(struct super_block *s,
struct reiserfs_journal_list *jl);
static void flush_async_commits(void *p);
static void queue_log_writer(struct super_block *s);
/* values for join in do_journal_begin_r */
enum {
JBEGIN_REG = 0, /* regular journal begin */
JBEGIN_JOIN = 1, /* join the running transaction if at all possible */
JBEGIN_ABORT = 2, /* called from cleanup code, ignores aborted flag */
};
static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
struct super_block * p_s_sb,
unsigned long nblocks,int join);
static void init_journal_hash(struct super_block *p_s_sb) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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 void disable_barrier(struct super_block *s)
{
REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
printk("reiserfs: disabling flush barriers on %s\n", reiserfs_bdevname(s));
}
static struct reiserfs_bitmap_node *
allocate_bitmap_node(struct super_block *p_s_sb) {
struct reiserfs_bitmap_node *bn ;
static int id;
bn = reiserfs_kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS, p_s_sb) ;
if (!bn) {
return NULL ;
}
bn->data = reiserfs_kmalloc(p_s_sb->s_blocksize, GFP_NOFS, p_s_sb) ;
if (!bn->data) {
reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
return NULL ;
}
bn->id = id++ ;
memset(bn->data, 0, p_s_sb->s_blocksize) ;
INIT_LIST_HEAD(&bn->list) ;
return bn ;
}
static struct reiserfs_bitmap_node *
get_bitmap_node(struct super_block *p_s_sb) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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, p_s_sb->s_blocksize) ;
journal->j_free_bitmap_nodes-- ;
return bn ;
}
bn = allocate_bitmap_node(p_s_sb) ;
if (!bn) {
yield();
goto repeat ;
}
return bn ;
}
static inline void free_bitmap_node(struct super_block *p_s_sb,
struct reiserfs_bitmap_node *bn) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
journal->j_used_bitmap_nodes-- ;
if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ;
reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
} else {
list_add(&bn->list, &journal->j_bitmap_nodes) ;
journal->j_free_bitmap_nodes++ ;
}
}
static void allocate_bitmap_nodes(struct super_block *p_s_sb) {
int i ;
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
struct reiserfs_bitmap_node *bn = NULL ;
for (i = 0 ; i < REISERFS_MIN_BITMAP_NODES ; i++) {
bn = allocate_bitmap_node(p_s_sb) ;
if (bn) {
list_add(&bn->list, &journal->j_bitmap_nodes) ;
journal->j_free_bitmap_nodes++ ;
} else {
break ; // this is ok, we'll try again when more are needed
}
}
}
static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
struct reiserfs_list_bitmap *jb) {
int bmap_nr = block / (p_s_sb->s_blocksize << 3) ;
int bit_nr = block % (p_s_sb->s_blocksize << 3) ;
if (!jb->bitmaps[bmap_nr]) {
jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb) ;
}
set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data) ;
return 0 ;
}
static void cleanup_bitmap_list(struct super_block *p_s_sb,
struct reiserfs_list_bitmap *jb) {
int i;
if (jb->bitmaps == NULL)
return;
for (i = 0 ; i < SB_BMAP_NR(p_s_sb) ; i++) {
if (jb->bitmaps[i]) {
free_bitmap_node(p_s_sb, jb->bitmaps[i]) ;
jb->bitmaps[i] = NULL ;
}
}
}
/*
** only call this on FS unmount.
*/
static int free_list_bitmaps(struct super_block *p_s_sb,
struct reiserfs_list_bitmap *jb_array) {
int i ;
struct reiserfs_list_bitmap *jb ;
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
jb = jb_array + i ;
jb->journal_list = NULL ;
cleanup_bitmap_list(p_s_sb, jb) ;
vfree(jb->bitmaps) ;
jb->bitmaps = NULL ;
}
return 0;
}
static int free_bitmap_nodes(struct super_block *p_s_sb) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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) ;
reiserfs_kfree(bn->data, p_s_sb->s_blocksize, p_s_sb) ;
reiserfs_kfree(bn, sizeof(struct reiserfs_bitmap_node), p_s_sb) ;
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 *p_s_sb,
struct reiserfs_list_bitmap *jb_array,
int bmap_nr) {
int i ;
int failed = 0 ;
struct reiserfs_list_bitmap *jb ;
int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *) ;
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
jb = jb_array + i ;
jb->journal_list = NULL ;
jb->bitmaps = vmalloc( mem ) ;
if (!jb->bitmaps) {
reiserfs_warning(p_s_sb, "clm-2000, unable to allocate bitmaps for journal lists") ;
failed = 1;
break ;
}
memset(jb->bitmaps, 0, mem) ;
}
if (failed) {
free_list_bitmaps(p_s_sb, jb_array) ;
return -1 ;
}
return 0 ;
}
/*
** find an available list bitmap. If you can't find one, flush a commit list
** and try again
*/
static struct reiserfs_list_bitmap *
get_list_bitmap(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
int i,j ;
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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(p_s_sb, journal->j_list_bitmap[i].journal_list, 1) ;
if (!journal->j_list_bitmap[i].journal_list) {
break ;
}
} else {
break ;
}
}
if (jb->journal_list) { /* double check to make sure if flushed correctly */
return NULL ;
}
jb->journal_list = jl ;
return jb ;
}
/*
** allocates a new chunk of X nodes, and links them all together as a list.
** Uses the cnode->next and cnode->prev pointers
** returns NULL on failure
*/
static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) {
struct reiserfs_journal_cnode *head ;
int i ;
if (num_cnodes <= 0) {
return NULL ;
}
head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
if (!head) {
return NULL ;
}
memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
head[0].prev = NULL ;
head[0].next = head + 1 ;
for (i = 1 ; i < num_cnodes; i++) {
head[i].prev = head + (i - 1) ;
head[i].next = head + (i + 1) ; /* if last one, overwrite it after the if */
}
head[num_cnodes -1].next = NULL ;
return head ;
}
/*
** pulls a cnode off the free list, or returns NULL on failure
*/
static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) {
struct reiserfs_journal_cnode *cn ;
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
reiserfs_check_lock_depth(p_s_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 *p_s_sb, struct reiserfs_journal_cnode *cn) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
reiserfs_check_lock_depth(p_s_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);
}
/* utility function to force a BUG if it is called without the big
** kernel lock held. caller is the string printed just before calling BUG()
*/
void reiserfs_check_lock_depth(struct super_block *sb, char *caller) {
#ifdef CONFIG_SMP
if (current->lock_depth < 0) {
reiserfs_panic (sb, "%s called without kernel lock held", caller) ;
}
#else
;
#endif
}
/* return a cnode with same dev, block number and size in table, or null if not found */
static inline struct reiserfs_journal_cnode *
get_journal_hash_dev(struct 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 *p_s_sb,
int bmap_nr, int bit_nr, int search_all,
b_blocknr_t *next_zero_bit) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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( p_s_sb, journal.in_journal );
/* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
** if we crash before the transaction that freed it commits, this transaction won't
** have committed either, and the block will never be written
*/
if (search_all) {
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
PROC_INFO_INC( p_s_sb, journal.in_journal_bitmap );
jb = 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),
p_s_sb->s_blocksize << 3, bit_nr+1) ;
return 1 ;
}
}
}
bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
/* is it in any old transactions? */
if (search_all && (cn = get_journal_hash_dev(p_s_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(p_s_sb, journal->j_hash_table, bl))) {
BUG();
return 1;
}
PROC_INFO_INC( p_s_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 */
inline static void lock_journal(struct super_block *p_s_sb) {
PROC_INFO_INC( p_s_sb, journal.lock_journal );
down(&SB_JOURNAL(p_s_sb)->j_lock);
}
/* unlock the current transaction */
inline static void unlock_journal(struct super_block *p_s_sb) {
up(&SB_JOURNAL(p_s_sb)->j_lock);
}
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, "trans id %lu, refcount at %d", jl->j_trans_id,
jl->j_refcount);
}
if (--jl->j_refcount == 0)
reiserfs_kfree(jl, sizeof(struct reiserfs_journal_list), s);
}
/*
** this used to be much more involved, and I'm keeping it just in case things get ugly again.
** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
** transaction.
*/
static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
struct reiserfs_list_bitmap *jb = jl->j_list_bitmap ;
if (jb) {
cleanup_bitmap_list(p_s_sb, jb) ;
}
jl->j_list_bitmap->journal_list = NULL ;
jl->j_list_bitmap = NULL ;
}
static int journal_list_still_alive(struct super_block *s,
unsigned long 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;
}
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) ;
put_bh(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) ;
}
static int submit_barrier_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();
return submit_bh(WRITE_BARRIER, bh) ;
}
static void check_barrier_completion(struct super_block *s,
struct buffer_head *bh) {
if (buffer_eopnotsupp(bh)) {
clear_buffer_eopnotsupp(bh);
disable_barrier(s);
set_buffer_uptodate(bh);
set_buffer_dirty(bh);
sync_dirty_buffer(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;
get_fs_excl();
for (i = 0; i < chunk->nr ; i++) {
submit_logged_buffer(chunk->bh[i]) ;
}
chunk->nr = 0;
put_fs_excl();
}
static void write_ordered_chunk(struct buffer_chunk *chunk) {
int i;
get_fs_excl();
for (i = 0; i < chunk->nr ; i++) {
submit_ordered_buffer(chunk->bh[i]) ;
}
chunk->nr = 0;
put_fs_excl();
}
static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
spinlock_t *lock,
void (fn)(struct buffer_chunk *))
{
int ret = 0;
if (chunk->nr >= CHUNK_SIZE)
BUG();
chunk->bh[chunk->nr++] = bh;
if (chunk->nr >= CHUNK_SIZE) {
ret = 1;
if (lock)
spin_unlock(lock);
fn(chunk);
if (lock)
spin_lock(lock);
}
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
*/
if (bh->b_private)
BUG();
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 (test_set_buffer_locked(bh)) {
if (!buffer_dirty(bh)) {
list_del_init(&jh->list);
list_add(&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;
}
if (buffer_dirty(bh)) {
list_del_init(&jh->list);
list_add(&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;
}
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 long trans_id = jl->j_trans_id;
unsigned long other_trans_id;
unsigned long 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;
}
int reiserfs_async_progress_wait(struct super_block *s) {
DEFINE_WAIT(wait);
struct reiserfs_journal *j = SB_JOURNAL(s);
if (atomic_read(&j->j_async_throttle))
blk_congestion_wait(WRITE, HZ/10);
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;
int bn ;
struct buffer_head *tbh = NULL ;
unsigned long trans_id = jl->j_trans_id;
struct reiserfs_journal *journal = SB_JOURNAL (s);
int barrier = 0;
int retval = 0;
reiserfs_check_lock_depth(s, "flush_commit_list") ;
if (atomic_read(&jl->j_older_commits_done)) {
return 0 ;
}
get_fs_excl();
/* 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 */
down(&jl->j_commit_lock);
if (!journal_list_still_alive(s, trans_id)) {
up(&jl->j_commit_lock);
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) ;
}
up(&jl->j_commit_lock);
goto put_jl;
}
if (!list_empty(&jl->j_bh_list)) {
unlock_kernel();
write_ordered_buffers(&journal->j_dirty_buffers_lock,
journal, jl, &jl->j_bh_list);
lock_kernel();
}
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
*/
atomic_inc(&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) ;
if (buffer_dirty(tbh)) /* redundant, ll_rw_block() checks */
ll_rw_block(WRITE, 1, &tbh) ;
put_bh(tbh) ;
}
atomic_dec(&journal->j_async_throttle);
/* wait on everything written so far before writing the commit
* if we are in barrier mode, send the commit down now
*/
barrier = reiserfs_barrier_flush(s);
if (barrier) {
int ret;
lock_buffer(jl->j_commit_bh);
ret = submit_barrier_buffer(jl->j_commit_bh);
if (ret == -EOPNOTSUPP) {
set_buffer_uptodate(jl->j_commit_bh);
disable_barrier(s);
barrier = 0;
}
}
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) ;
wait_on_buffer(tbh) ;
// since we're using ll_rw_blk above, it might have skipped over
// a locked buffer. Double check here
//
if (buffer_dirty(tbh)) /* redundant, sync_dirty_buffer() checks */
sync_dirty_buffer(tbh);
if (unlikely (!buffer_uptodate(tbh))) {
#ifdef CONFIG_REISERFS_CHECK
reiserfs_warning(s, "journal-601, buffer write failed") ;
#endif
retval = -EIO;
}
put_bh(tbh) ; /* once for journal_find_get_block */
put_bh(tbh) ; /* once due to original getblk in do_journal_end */
atomic_dec(&(jl->j_commit_left)) ;
}
BUG_ON (atomic_read(&(jl->j_commit_left)) != 1);
if (!barrier) {
if (buffer_dirty(jl->j_commit_bh))
BUG();
mark_buffer_dirty(jl->j_commit_bh) ;
sync_dirty_buffer(jl->j_commit_bh) ;
} else
wait_on_buffer(jl->j_commit_bh);
check_barrier_completion(s, jl->j_commit_bh);
/* 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 propogating 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) ;
}
up(&jl->j_commit_lock);
put_jl:
put_journal_list(s, jl);
if (retval)
reiserfs_abort (s, retval, "Journal write error in %s", __FUNCTION__);
put_fs_excl();
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 *p_s_sb, struct reiserfs_journal_list *jl, int debug) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_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 (p_s_sb, "block %u, bh is %d, state %ld", cn->blocknr,
cn->bh ? 1: 0, cn->state) ;
}
cn->state = 0 ;
remove_journal_hash(p_s_sb, journal->j_list_hash_table, jl, cn->blocknr, 1) ;
}
last = cn ;
cn = cn->next ;
free_cnode(p_s_sb, last) ;
}
jl->j_realblock = NULL ;
}
/*
** if this timestamp is greater than the timestamp we wrote last to the header block, write it to the header block.
** once this is done, I can safely say the log area for this transaction won't ever be replayed, and I can start
** releasing blocks in this transaction for reuse as data blocks.
** called by flush_journal_list, before it calls remove_all_from_journal_list
**
*/
static int _update_journal_header_block(struct super_block *p_s_sb, unsigned long offset, unsigned long trans_id) {
struct reiserfs_journal_header *jh ;
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
if (reiserfs_is_journal_aborted (journal))
return -EIO;
if (trans_id >= journal->j_last_flush_trans_id) {
if (buffer_locked((journal->j_header_bh))) {
wait_on_buffer((journal->j_header_bh)) ;
if (unlikely (!buffer_uptodate(journal->j_header_bh))) {
#ifdef CONFIG_REISERFS_CHECK
reiserfs_warning (p_s_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) ;
if (reiserfs_barrier_flush(p_s_sb)) {
int ret;
lock_buffer(journal->j_header_bh);
ret = submit_barrier_buffer(journal->j_header_bh);
if (ret == -EOPNOTSUPP) {
set_buffer_uptodate(journal->j_header_bh);
disable_barrier(p_s_sb);
goto sync;
}
wait_on_buffer(journal->j_header_bh);
check_barrier_completion(p_s_sb, journal->j_header_bh);
} else {
sync:
set_buffer_dirty(journal->j_header_bh) ;
sync_dirty_buffer(journal->j_header_bh) ;
}
if (!buffer_uptodate(journal->j_header_bh)) {
reiserfs_warning (p_s_sb, "journal-837: IO error during journal replay");
return -EIO ;
}
}
return 0 ;
}
static int update_journal_header_block(struct super_block *p_s_sb,
unsigned long offset,
unsigned long trans_id) {
return _update_journal_header_block(p_s_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 *p_s_sb,
struct reiserfs_journal_list *jl)
{
struct list_head *entry;
struct reiserfs_journal_list *other_jl ;
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
unsigned long 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(p_s_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;
BUG_ON (j_len_saved <= 0);
if (atomic_read(&journal->j_wcount) != 0) {
reiserfs_warning(s, "clm-2048: flush_journal_list called with wcount %d",
atomic_read(&journal->j_wcount)) ;
}
BUG_ON (jl->j_trans_id == 0);
/* if flushall == 0, the lock is already held */
if (flushall) {
down(&journal->j_flush_sem);
} else if (!down_trylock(&journal->j_flush_sem)) {
BUG();
}
count = 0 ;
if (j_len_saved > journal->j_trans_max) {
reiserfs_panic(s, "journal-715: flush_journal_list, length is %lu, trans id %lu\n", j_len_saved, jl->j_trans_id);
return 0 ;
}
get_fs_excl();
/* 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: panic journal list is flushing, wcount is not 0\n") ;
}
cn = jl->j_realblock ;
while(cn) {
was_jwait = 0 ;
was_dirty = 0 ;
saved_bh = NULL ;
/* blocknr of 0 is no longer in the hash, ignore it */
if (cn->blocknr == 0) {
goto free_cnode ;
}
/* 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 commited, 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, __FUNCTION__);
}
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\n") ;
}
wait_on_buffer(cn->bh) ;
if (!cn->bh) {
reiserfs_panic(s, "journal-1012: cn->bh is NULL\n") ;
}
if (unlikely (!buffer_uptodate(cn->bh))) {
#ifdef CONFIG_REISERFS_CHECK
reiserfs_warning(s, "journal-949: buffer write failed\n") ;
#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));
/* undo the inc from journal_mark_dirty */
put_bh(cn->bh) ;
brelse(cn->bh) ;
}
cn = cn->next ;
}
}
if (err)
reiserfs_abort (s, -EIO, "Write error while pushing transaction to disk in %s", __FUNCTION__);
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", __FUNCTION__);
}
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)
up(&journal->j_flush_sem);
put_fs_excl();
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 long *next_trans_id,
int num_blocks,
int num_trans) {
int ret = 0;
int written = 0 ;
int transactions_flushed = 0;
unsigned long 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;
down(&journal->j_flush_sem);
if (!journal_list_still_alive(s, orig_trans_id)) {
goto done;
}
/* we've got j_flush_sem 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:
up(&journal->j_flush_sem);
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 long 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);
}
/* 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);
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 ;
if (cur->bh && cur->jlist) /* anybody who clears the cur->bh will also dec the nonzerolen */
atomic_dec(&(cur->jlist->j_nonzerolen)) ;
cur->bh = NULL ;
cur->jlist = NULL ;
}
cur = cur->hnext ;
}
}
static void free_journal_ram(struct super_block *p_s_sb) {
struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
reiserfs_kfree(journal->j_current_jl,
sizeof(struct reiserfs_journal_list), p_s_sb);
journal->j_num_lists--;
vfree(journal->j_cnode_free_orig) ;
free_list_bitmaps(p_s_sb, journal->j_list_bitmap) ;
free_bitmap_nodes(p_s_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(p_s_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 *p_s_sb, int error) {
struct reiserfs_transaction_handle myth ;
int flushed = 0;
struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
/* we only want to flush out transactions if we were called with error == 0
*/
if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
/* end the current trans */
BUG_ON (!th->t_trans_id);
do_journal_end(th, p_s_sb,10, FLUSH_ALL) ;
/* make sure something gets logged to force our way into the flush code */
if (!journal_join(&myth, p_s_sb, 1)) {
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&myth, p_s_sb,1, FLUSH_ALL) ;
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, p_s_sb, 1)) {
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&myth, p_s_sb, 1, FLUSH_ALL) ;
}
}
reiserfs_mounted_fs_count-- ;
/* wait for all commits to finish */
cancel_delayed_work(&SB_JOURNAL(p_s_sb)->j_work);
flush_workqueue(commit_wq);
if (!reiserfs_mounted_fs_count) {
destroy_workqueue(commit_wq);
commit_wq = NULL;
}
free_journal_ram(p_s_sb) ;
return 0 ;
}
/*
** call on unmount. flush all journal trans, release all alloc'd ram
*/
int journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
return do_journal_release(th, p_s_sb, 0) ;
}
/*
** only call from an error condition inside reiserfs_read_super!
*/
int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
return do_journal_release(th, p_s_sb, 1) ;
}
/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
static int journal_compare_desc_commit(struct super_block *p_s_sb, struct reiserfs_journal_desc *desc,
struct reiserfs_journal_commit *commit) {
if (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(p_s_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
*/
static int journal_transaction_is_valid(struct super_block *p_s_sb, struct buffer_head *d_bh, unsigned long *oldest_invalid_trans_id, unsigned long *newest_mount_id) {
struct reiserfs_journal_desc *desc ;
struct reiserfs_journal_commit *commit ;
struct buffer_head *c_bh ;
unsigned long offset ;
if (!d_bh)
return 0 ;
desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
if (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(p_s_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(p_s_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(p_s_sb)->j_trans_max ) {
reiserfs_warning(p_s_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(p_s_sb) ;
/* ok, we have a journal description block, lets see if the transaction was valid */
c_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
((offset + get_desc_trans_len(desc) + 1) % SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
if (!c_bh)
return 0 ;
commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
"journal_transaction_is_valid, commit offset %ld had bad "
"time %d or length %d",
c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_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(p_s_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(p_s_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(p_s_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.
*/
static int journal_read_transaction(struct super_block *p_s_sb, unsigned long cur_dblock, unsigned long oldest_start,
unsigned long oldest_trans_id, unsigned long newest_mount_id) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
struct reiserfs_journal_desc *desc ;
struct reiserfs_journal_commit *commit ;
unsigned long trans_id = 0 ;
struct buffer_head *c_bh ;
struct buffer_head *d_bh ;
struct buffer_head **log_blocks = NULL ;
struct buffer_head **real_blocks = NULL ;
unsigned long trans_offset ;
int i;
int trans_half;
d_bh = journal_bread(p_s_sb, cur_dblock) ;
if (!d_bh)
return 1 ;
desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
"journal_read_transaction, offset %llu, len %d mount_id %d",
d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
get_desc_trans_len(desc), get_desc_mount_id(desc)) ;
if (get_desc_trans_id(desc) < oldest_trans_id) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
"journal_read_trans skipping because %lu is too old",
cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ;
brelse(d_bh) ;
return 1 ;
}
if (get_desc_mount_id(desc) != newest_mount_id) {
reiserfs_debug(p_s_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(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
((trans_offset + get_desc_trans_len(desc) + 1) %
SB_ONDISK_JOURNAL_SIZE(p_s_sb))) ;
if (!c_bh) {
brelse(d_bh) ;
return 1 ;
}
commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_read_transaction, "
"commit offset %llu had bad time %d or length %d",
c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
get_commit_trans_id(commit), get_commit_trans_len(commit));
brelse(c_bh) ;
brelse(d_bh) ;
return 1;
}
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 = reiserfs_kmalloc(get_desc_trans_len(desc) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ;
real_blocks = reiserfs_kmalloc(get_desc_trans_len(desc) * sizeof(struct buffer_head *), GFP_NOFS, p_s_sb) ;
if (!log_blocks || !real_blocks) {
brelse(c_bh) ;
brelse(d_bh) ;
reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_warning(p_s_sb, "journal-1169: kmalloc failed, unable to mount FS") ;
return -1 ;
}
/* get all the buffer heads */
trans_half = journal_trans_half (p_s_sb->s_blocksize) ;
for(i = 0 ; i < get_desc_trans_len(desc) ; i++) {
log_blocks[i] = journal_getblk(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + (trans_offset + 1 + i) % SB_ONDISK_JOURNAL_SIZE(p_s_sb));
if (i < trans_half) {
real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(desc->j_realblock[i])) ;
} else {
real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(commit->j_realblock[i - trans_half])) ;
}
if ( real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(p_s_sb) ) {
reiserfs_warning(p_s_sb, "journal-1207: REPLAY FAILURE fsck required! Block to replay is outside of filesystem");
goto abort_replay;
}
/* make sure we don't try to replay onto log or reserved area */
if (is_block_in_log_or_reserved_area(p_s_sb, real_blocks[i]->b_blocknr)) {
reiserfs_warning(p_s_sb, "journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block") ;
abort_replay:
brelse_array(log_blocks, i) ;
brelse_array(real_blocks, i) ;
brelse(c_bh) ;
brelse(d_bh) ;
reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
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(p_s_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) ;
reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
return -1 ;
}
memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size) ;
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]) ;
ll_rw_block(WRITE, 1, real_blocks + i) ;
}
for (i = 0 ; i < get_desc_trans_len(desc) ; i++) {
wait_on_buffer(real_blocks[i]) ;
if (!buffer_uptodate(real_blocks[i])) {
reiserfs_warning(p_s_sb, "journal-1226: REPLAY FAILURE, fsck required! buffer write failed") ;
brelse_array(real_blocks + i, get_desc_trans_len(desc) - i) ;
brelse(c_bh) ;
brelse(d_bh) ;
reiserfs_kfree(log_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_kfree(real_blocks, get_desc_trans_len(desc) * sizeof(struct buffer_head *), p_s_sb) ;
return -1 ;
}
brelse(real_blocks[i]) ;
}
cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + ((trans_offset + get_desc_trans_len(desc) + 2) % SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal "
"start to offset %ld",
cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb)) ;
/* init starting values for the first transaction, in case this is the last transaction to be replayed. */
journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
journal->j_last_flush_trans_id = trans_id ;
journal->j_trans_id = trans_id + 1;
brelse(c_bh) ;
brelse(d_bh) ;
reiserfs_kfree(log_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ;
reiserfs_kfree(real_blocks, le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), p_s_sb) ;
return 0 ;
}
/* 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, int block, int bufsize,
unsigned int max_block)
{
struct buffer_head * bhlist[BUFNR];
unsigned int blocks = BUFNR;
struct buffer_head * bh;
int i, j;
bh = __getblk (dev, block, bufsize );
if (buffer_uptodate (bh))
return (bh);
if (block + BUFNR > max_block) {
blocks = max_block - block;
}
bhlist[0] = bh;
j = 1;
for (i = 1; i < blocks; i++) {
bh = __getblk (dev, block + i, bufsize);
if (buffer_uptodate (bh)) {
brelse (bh);
break;
}
else bhlist[j++] = bh;
}
ll_rw_block (READ, j, bhlist);
for(i = 1; i < j; i++)
brelse (bhlist[i]);
bh = bhlist[0];
wait_on_buffer (bh);
if (buffer_uptodate (bh))
return bh;
brelse (bh);
return NULL;
}
/*
** 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.
*/
static int journal_read(struct super_block *p_s_sb) {
struct reiserfs_journal *journal = SB_JOURNAL (p_s_sb);
struct reiserfs_journal_desc *desc ;
unsigned long oldest_trans_id = 0;
unsigned long oldest_invalid_trans_id = 0 ;
time_t start ;
unsigned long oldest_start = 0;
unsigned long cur_dblock = 0 ;
unsigned long newest_mount_id = 9 ;
struct buffer_head *d_bh ;
struct reiserfs_journal_header *jh ;
int valid_journal_header = 0 ;
int replay_count = 0 ;
int continue_replay = 1 ;
int ret ;
char b[BDEVNAME_SIZE];
cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) ;
reiserfs_info (p_s_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(p_s_sb,
SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
SB_ONDISK_JOURNAL_SIZE(p_s_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) >= 0 &&
le32_to_cpu(jh->j_first_unflushed_offset) < SB_ONDISK_JOURNAL_SIZE(p_s_sb) &&
le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
oldest_start = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) +
le32_to_cpu(jh->j_first_unflushed_offset) ;
oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
newest_mount_id = le32_to_cpu(jh->j_mount_id);
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1153: found in "
"header: first_unflushed_offset %d, last_flushed_trans_id "
"%lu", le32_to_cpu(jh->j_first_unflushed_offset),
le32_to_cpu(jh->j_last_flush_trans_id)) ;
valid_journal_header = 1 ;
/* now, we try to read the first unflushed offset. If it is not valid,
** there is nothing more we can do, and it makes no sense to read
** through the whole log.
*/
d_bh = journal_bread(p_s_sb, SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + le32_to_cpu(jh->j_first_unflushed_offset)) ;
ret = journal_transaction_is_valid(p_s_sb, d_bh, NULL, NULL) ;
if (!ret) {
continue_replay = 0 ;
}
brelse(d_bh) ;
goto start_log_replay;
}
if (continue_replay && bdev_read_only(p_s_sb->s_bdev)) {
reiserfs_warning (p_s_sb,
"clm-2076: device is readonly, unable to replay log") ;
return -1 ;
}
/* ok, there are transactions that need to be replayed. start with the first log block, find
** all the valid transactions, and pick out the oldest.
*/
while(continue_replay && cur_dblock < (SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb))) {
/* 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, p_s_sb->s_blocksize,
SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb)) ;
ret = journal_transaction_is_valid(p_s_sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id) ;
if (ret == 1) {
desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
if (oldest_start == 0) { /* init all oldest_ values */
oldest_trans_id = get_desc_trans_id(desc) ;
oldest_start = d_bh->b_blocknr ;
newest_mount_id = get_desc_mount_id(desc) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1179: Setting "
"oldest_start to offset %llu, trans_id %lu",
oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_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(p_s_sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting "
"oldest_start to offset %lu, trans_id %lu",
oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
oldest_trans_id) ;
}
if (newest_mount_id < get_desc_mount_id(desc)) {
newest_mount_id = get_desc_mount_id(desc) ;
reiserfs_debug(p_s_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(p_s_sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay "
"from offset %llu, trans_id %lu",
cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb),
oldest_trans_id) ;
}
replay_count = 0 ;
while(continue_replay && oldest_trans_id > 0) {
ret = journal_read_transaction(p_s_sb, cur_dblock, oldest_start, oldest_trans_id, newest_mount_id) ;
if (ret < 0) {
return ret ;
} else if (ret != 0) {
break ;
}
cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + journal->j_start ;
replay_count++ ;
if (cur_dblock == oldest_start)
break;
}
if (oldest_trans_id == 0) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1225: No valid "
"transactions found") ;
}
/* 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;
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(p_s_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 (p_s_sb, "replayed %d transactions in %lu seconds\n",
replay_count, get_seconds() - start) ;
}
if (!bdev_read_only(p_s_sb->s_bdev) &&
_update_journal_header_block(p_s_sb, journal->j_start,
journal->j_last_flush_trans_id))
{
/* replay failed, caller must call free_journal_ram and abort
** the mount
*/
return -1 ;
}
return 0 ;
}
static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
{
struct reiserfs_journal_list *jl;
retry:
jl = reiserfs_kmalloc(sizeof(struct reiserfs_journal_list), GFP_NOFS, s);
if (!jl) {
yield();
goto retry;
}
memset(jl, 0, sizeof(*jl));
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);
sema_init(&jl->j_commit_lock, 1);
SB_JOURNAL(s)->j_num_lists++;
get_journal_list(jl);
return jl;
}
static void journal_list_init(struct super_block *p_s_sb) {
SB_JOURNAL(p_s_sb)->j_current_jl = alloc_journal_list(p_s_sb);
}
static int release_journal_dev( struct super_block *super,
struct reiserfs_journal *journal )
{
int result;
result = 0;
if( journal -> j_dev_file != NULL ) {
result = filp_close( journal -> j_dev_file, NULL );
journal -> j_dev_file = NULL;
journal -> j_dev_bd = NULL;
} else if( journal -> j_dev_bd != NULL ) {
result = blkdev_put( journal -> j_dev_bd );
journal -> j_dev_bd = NULL;
}
if( result != 0 ) {
reiserfs_warning(super, "sh-457: release_journal_dev: Cannot release journal device: %i", result );
}
return result;
}
static int journal_init_dev( struct super_block *super,
struct reiserfs_journal *journal,
const char *jdev_name )
{
int result;
dev_t jdev;
int blkdev_mode = FMODE_READ | FMODE_WRITE;
char b[BDEVNAME_SIZE];
result = 0;
journal -> j_dev_bd = NULL;
journal -> j_dev_file = NULL;
jdev = SB_ONDISK_JOURNAL_DEVICE( super ) ?
new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
if (bdev_read_only(super->s_bdev))
blkdev_mode = FMODE_READ;
/* there is no "jdev" option and journal is on separate device */
if( ( !jdev_name || !jdev_name[ 0 ] ) ) {
journal->j_dev_bd = open_by_devnum(jdev, 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: journal_init_dev: "
"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_file = filp_open( jdev_name, 0, 0 );
if( !IS_ERR( journal -> j_dev_file ) ) {
struct inode *jdev_inode = journal->j_dev_file->f_mapping->host;
if( !S_ISBLK( jdev_inode -> i_mode ) ) {
reiserfs_warning(super, "journal_init_dev: '%s' is "
"not a block device", jdev_name );
result = -ENOTBLK;
release_journal_dev( super, journal );
} else {
/* ok */
journal->j_dev_bd = I_BDEV(jdev_inode);
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));
}
} else {
result = PTR_ERR( journal -> j_dev_file );
journal -> j_dev_file = NULL;
reiserfs_warning (super,
"journal_init_dev: Cannot open '%s': %i",
jdev_name, result );
}
return result;
}
/*
** must be called once on fs mount. calls journal_read for you
*/
int journal_init(struct super_block *p_s_sb, const char * j_dev_name, int old_format, unsigned int commit_max_age) {
int num_cnodes = SB_ONDISK_JOURNAL_SIZE(p_s_sb) * 2 ;
struct buffer_head *bhjh;
struct reiserfs_super_block * rs;
struct reiserfs_journal_header *jh;
struct reiserfs_journal *journal;
struct reiserfs_journal_list *jl;
char b[BDEVNAME_SIZE];
journal = SB_JOURNAL(p_s_sb) = vmalloc(sizeof (struct reiserfs_journal)) ;
if (!journal) {
reiserfs_warning (p_s_sb, "journal-1256: unable to get memory for journal structure") ;
return 1 ;
}
memset(journal, 0, sizeof(struct reiserfs_journal)) ;
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(p_s_sb,
journal->j_list_bitmap,
SB_BMAP_NR(p_s_sb)))
goto free_and_return ;
allocate_bitmap_nodes(p_s_sb) ;
/* reserved for journal area support */
SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) = (old_format ?
REISERFS_OLD_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize +
SB_BMAP_NR(p_s_sb) + 1 :
REISERFS_DISK_OFFSET_IN_BYTES / p_s_sb->s_blocksize + 2);
/* Sanity check to see is the standard journal fitting withing first bitmap
(actual for small blocksizes) */
if ( !SB_ONDISK_JOURNAL_DEVICE( p_s_sb ) &&
(SB_JOURNAL_1st_RESERVED_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb) > p_s_sb->s_blocksize * 8) ) {
reiserfs_warning (p_s_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(p_s_sb),
SB_ONDISK_JOURNAL_SIZE(p_s_sb), p_s_sb->s_blocksize);
goto free_and_return;
}
if( journal_init_dev( p_s_sb, journal, j_dev_name ) != 0 ) {
reiserfs_warning (p_s_sb, "sh-462: unable to initialize jornal device");
goto free_and_return;
}
rs = SB_DISK_SUPER_BLOCK(p_s_sb);
/* read journal header */
bhjh = journal_bread(p_s_sb,
SB_ONDISK_JOURNAL_1st_BLOCK(p_s_sb) + SB_ONDISK_JOURNAL_SIZE(p_s_sb));
if (!bhjh) {
reiserfs_warning (p_s_sb, "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 (p_s_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 (journal->j_trans_max) {
/* make sure these parameters are available, assign it if they are not */
__u32 initial = journal->j_trans_max;
__u32 ratio = 1;
if (p_s_sb->s_blocksize < 4096)
ratio = 4096 / p_s_sb->s_blocksize;
if (SB_ONDISK_JOURNAL_SIZE(p_s_sb)/journal->j_trans_max < JOURNAL_MIN_RATIO)
journal->j_trans_max = SB_ONDISK_JOURNAL_SIZE(p_s_sb) / JOURNAL_MIN_RATIO;
if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio)
journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT / ratio;
if (journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio)
journal->j_trans_max = JOURNAL_TRANS_MIN_DEFAULT / ratio;
if (journal->j_trans_max != initial)
reiserfs_warning (p_s_sb, "sh-461: journal_init: wrong transaction max size (%u). Changed to %u",
initial, journal->j_trans_max);
journal->j_max_batch = journal->j_trans_max*
JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT;
}
if (!journal->j_trans_max) {
/*we have the file system was created by old version of mkreiserfs
so this field contains zero value */
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 ;
/* for blocksize >= 4096 - max transaction size is 1024. For block size < 4096
trans max size is decreased proportionally */
if (p_s_sb->s_blocksize < 4096) {
journal->j_trans_max /= (4096 / p_s_sb->s_blocksize) ;
journal->j_max_batch = (journal->j_trans_max) * 9 / 10 ;
}
}
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 (p_s_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(p_s_sb),
SB_ONDISK_JOURNAL_1st_BLOCK(p_s_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(p_s_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)) ;
sema_init(&journal->j_lock, 1);
sema_init(&journal->j_flush_sem, 1);
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 ;
init_journal_hash(p_s_sb) ;
jl = journal->j_current_jl;
jl->j_list_bitmap = get_list_bitmap(p_s_sb, jl);
if (!jl->j_list_bitmap) {
reiserfs_warning(p_s_sb, "journal-2005, get_list_bitmap failed for journal list 0") ;
goto free_and_return;
}
if (journal_read(p_s_sb) < 0) {
reiserfs_warning(p_s_sb, "Replay Failure, unable to mount") ;
goto free_and_return;
}
reiserfs_mounted_fs_count++ ;
if (reiserfs_mounted_fs_count <= 1)
commit_wq = create_workqueue("reiserfs");
INIT_WORK(&journal->j_work, flush_async_commits, p_s_sb);
return 0 ;
free_and_return:
free_journal_ram(p_s_sb);
return 1;
}
/*
** test for a polite end of the current transaction. Used by file_write, and should
** be used by delete to make sure they don't write more than can fit inside a single
** transaction
*/
int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) {
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 ;
}
return 0 ;
}
/* this must be called inside a transaction, and requires the
** kernel_lock to be held
*/
void reiserfs_block_writes(struct reiserfs_transaction_handle *th) {
struct 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, and does not
** require BKL
*/
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, and does not
** require BKL
*/
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))
schedule();
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 long trans_id)
{
struct reiserfs_journal *journal = SB_JOURNAL (sb);
unsigned long bcount = journal->j_bcount;
while(1) {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(1);
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 * p_s_sb,unsigned long nblocks,int join) {
time_t now = get_seconds() ;
int old_trans_id ;
struct reiserfs_journal *journal = SB_JOURNAL(p_s_sb);
struct reiserfs_transaction_handle myth;
int sched_count = 0;
int retval;
reiserfs_check_lock_depth(p_s_sb, "journal_begin") ;
if (nblocks > journal->j_trans_max)
BUG();
PROC_INFO_INC( p_s_sb, journal.journal_being );
/* set here for journal_join */
th->t_refcount = 1;
th->t_super = p_s_sb ;
relock:
lock_journal(p_s_sb) ;
if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted (journal)) {
unlock_journal (p_s_sb);
retval = journal->j_errno;
goto out_fail;
}
journal->j_bcount++;
if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
unlock_journal(p_s_sb) ;
reiserfs_wait_on_write_block(p_s_sb) ;
PROC_INFO_INC( p_s_sb, journal.journal_relock_writers );
goto relock ;
}
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;
unlock_journal(p_s_sb) ; /* allow others to finish this transaction */
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(p_s_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(p_s_sb);
}
goto relock;
}
retval = journal_join(&myth, p_s_sb, 1) ;
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, p_s_sb, 1, 0) ;
} else {
retval = do_journal_end(&myth, p_s_sb, 1, COMMIT_NOW) ;
}
if (retval)
goto out_fail;
PROC_INFO_INC( p_s_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(p_s_sb) ;
INIT_LIST_HEAD (&th->t_list);
get_fs_excl();
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 = p_s_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++ ;
if (th->t_refcount < 2) {
BUG() ;
}
return th ;
}
th = reiserfs_kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS, s) ;
if (!th)
return NULL;
ret = journal_begin(th, s, nblocks) ;
if (ret) {
reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle), s) ;
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, th->t_super, th->t_blocks_allocated);
else
ret = -EIO;
if (th->t_refcount == 0) {
SB_JOURNAL(s)->j_persistent_trans--;
reiserfs_kfree(th, sizeof(struct reiserfs_transaction_handle), s) ;
}
return ret;
}
static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
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 ;
if (cur_th && cur_th->t_refcount > 1) {
BUG() ;
}
return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_JOIN) ;
}
int journal_join_abort(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
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 ;
if (cur_th && cur_th->t_refcount > 1) {
BUG() ;
}
return do_journal_begin_r(th, p_s_sb, nblocks, JBEGIN_ABORT) ;
}
int journal_begin(struct reiserfs_transaction_handle *th, struct super_block * p_s_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 == p_s_sb) {
BUG_ON (!cur_th->t_refcount);
cur_th->t_refcount++ ;
memcpy(th, cur_th, sizeof(*th));
if (th->t_refcount <= 1)
reiserfs_warning (p_s_sb, "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(p_s_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, p_s_sb, nblocks, JBEGIN_REG) ;
if (current->journal_info != th)
BUG() ;
/* 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