Google Git
Sign in
kernel / pub / scm / linux / kernel / git / tglx / history / refs/tags/v2.5.2 / . / fs / reiserfs / journal.c
blob: 98d6b2dc31aa05d414dfc5bfe91de78a665a9f2b [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
**
** The commit thread -- a writer process for async commits. It allows a
** a process to request a log flush on a task queue.
** the commit will happen once the commit thread wakes up.
** The benefit here is the writer (with whatever
** related locks it has) doesn't have to wait for the
** log blocks to hit disk if it doesn't want to.
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/sched.h>
#include <asm/semaphore.h>
#include <linux/vmalloc.h>
#include <linux/reiserfs_fs.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/locks.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
/* the number of mounted filesystems. This is used to decide when to
** start and kill the commit thread
*/
static int reiserfs_mounted_fs_count = 0 ;
/* wake this up when you add something to the commit thread task queue */
DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_wait) ;
/* wait on this if you need to be sure you task queue entries have been run */
static DECLARE_WAIT_QUEUE_HEAD(reiserfs_commit_thread_done) ;
DECLARE_TASK_QUEUE(reiserfs_commit_thread_tq) ;
#define JOURNAL_TRANS_HALF 1018 /* must be correct to keep the desc and commit structs at 4k */
/* cnode stat bits. Move these into reiserfs_fs.h */
#define BLOCK_FREED 2 /* this block was freed, and can't be written. */
#define BLOCK_FREED_HOLDER 3 /* this block was freed during this transaction, and can't be written */
#define BLOCK_NEEDS_FLUSH 4 /* used in flush_journal_list */
/* flags for do_journal_end */
#define FLUSH_ALL 1 /* flush commit and real blocks */
#define COMMIT_NOW 2 /* end and commit this transaction */
#define WAIT 4 /* wait for the log blocks to hit the disk*/
/* state bits for the journal */
#define WRITERS_BLOCKED 1 /* set when new writers not allowed */
static int do_journal_end(struct reiserfs_transaction_handle *,struct super_block *,unsigned long nblocks,int flags) ;
static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) ;
static int can_dirty(struct reiserfs_journal_cnode *cn) ;
static void init_journal_hash(struct super_block *p_s_sb) {
memset(SB_JOURNAL(p_s_sb)->j_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
}
/*
** clears BH_Dirty and sticks the buffer on the clean list. Called because I can't allow refile_buffer to
** make schedule happen after I've freed a block. Look at remove_from_transaction and journal_mark_freed for
** more details.
*/
static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) {
if (bh) {
clear_bit(BH_Dirty, &bh->b_state) ;
refile_buffer(bh) ;
}
return 0 ;
}
static struct reiserfs_bitmap_node *
allocate_bitmap_node(struct super_block *p_s_sb) {
struct reiserfs_bitmap_node *bn ;
static int id = 0 ;
bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS) ;
if (!bn) {
return NULL ;
}
bn->data = kmalloc(p_s_sb->s_blocksize, GFP_NOFS) ;
if (!bn->data) {
kfree(bn) ;
return NULL ;
}
bn->id = id++ ;
memset(bn->data, 0, p_s_sb->s_blocksize) ;
INIT_LIST_HEAD(&bn->list) ;
return bn ;
}
static struct reiserfs_bitmap_node *
get_bitmap_node(struct super_block *p_s_sb) {
struct reiserfs_bitmap_node *bn = NULL;
struct list_head *entry = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes++ ;
repeat:
if(entry != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) {
bn = list_entry(entry, struct reiserfs_bitmap_node, list) ;
list_del(entry) ;
memset(bn->data, 0, p_s_sb->s_blocksize) ;
SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ;
return bn ;
}
bn = allocate_bitmap_node(p_s_sb) ;
if (!bn) {
yield();
goto repeat ;
}
return bn ;
}
static inline void free_bitmap_node(struct super_block *p_s_sb,
struct reiserfs_bitmap_node *bn) {
SB_JOURNAL(p_s_sb)->j_used_bitmap_nodes-- ;
if (SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
kfree(bn->data) ;
kfree(bn) ;
} else {
list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ;
}
}
static void allocate_bitmap_nodes(struct super_block *p_s_sb) {
int i ;
struct reiserfs_bitmap_node *bn = NULL ;
for (i = 0 ; i < REISERFS_MIN_BITMAP_NODES ; i++) {
bn = allocate_bitmap_node(p_s_sb) ;
if (bn) {
list_add(&bn->list, &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes++ ;
} else {
break ; // this is ok, we'll try again when more are needed
}
}
}
static int set_bit_in_list_bitmap(struct super_block *p_s_sb, int block,
struct reiserfs_list_bitmap *jb) {
int bmap_nr = block / (p_s_sb->s_blocksize << 3) ;
int bit_nr = block % (p_s_sb->s_blocksize << 3) ;
if (!jb->bitmaps[bmap_nr]) {
jb->bitmaps[bmap_nr] = get_bitmap_node(p_s_sb) ;
}
set_bit(bit_nr, jb->bitmaps[bmap_nr]->data) ;
return 0 ;
}
static void cleanup_bitmap_list(struct super_block *p_s_sb,
struct reiserfs_list_bitmap *jb) {
int i;
for (i = 0 ; i < SB_BMAP_NR(p_s_sb) ; i++) {
if (jb->bitmaps[i]) {
free_bitmap_node(p_s_sb, jb->bitmaps[i]) ;
jb->bitmaps[i] = NULL ;
}
}
}
/*
** only call this on FS unmount.
*/
static int free_list_bitmaps(struct super_block *p_s_sb,
struct reiserfs_list_bitmap *jb_array) {
int i ;
struct reiserfs_list_bitmap *jb ;
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
jb = jb_array + i ;
jb->journal_list = NULL ;
cleanup_bitmap_list(p_s_sb, jb) ;
vfree(jb->bitmaps) ;
jb->bitmaps = NULL ;
}
return 0;
}
static int free_bitmap_nodes(struct super_block *p_s_sb) {
struct list_head *next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
struct reiserfs_bitmap_node *bn ;
while(next != &SB_JOURNAL(p_s_sb)->j_bitmap_nodes) {
bn = list_entry(next, struct reiserfs_bitmap_node, list) ;
list_del(next) ;
kfree(bn->data) ;
kfree(bn) ;
next = SB_JOURNAL(p_s_sb)->j_bitmap_nodes.next ;
SB_JOURNAL(p_s_sb)->j_free_bitmap_nodes-- ;
}
return 0 ;
}
/*
** get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
** jb_array is the array to be filled in.
*/
int reiserfs_allocate_list_bitmaps(struct super_block *p_s_sb,
struct reiserfs_list_bitmap *jb_array,
int bmap_nr) {
int i ;
int failed = 0 ;
struct reiserfs_list_bitmap *jb ;
int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *) ;
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
jb = jb_array + i ;
jb->journal_list = NULL ;
jb->bitmaps = vmalloc( mem ) ;
if (!jb->bitmaps) {
reiserfs_warning("clm-2000, unable to allocate bitmaps for journal lists\n") ;
failed = 1;
break ;
}
memset(jb->bitmaps, 0, mem) ;
}
if (failed) {
free_list_bitmaps(p_s_sb, jb_array) ;
return -1 ;
}
return 0 ;
}
/*
** find an available list bitmap. If you can't find one, flush a commit list
** and try again
*/
static struct reiserfs_list_bitmap *
get_list_bitmap(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
int i,j ;
struct reiserfs_list_bitmap *jb = NULL ;
for (j = 0 ; j < (JOURNAL_NUM_BITMAPS * 3) ; j++) {
i = SB_JOURNAL(p_s_sb)->j_list_bitmap_index ;
SB_JOURNAL(p_s_sb)->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS ;
jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ;
if (SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) {
flush_commit_list(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list, 1) ;
if (!SB_JOURNAL(p_s_sb)->j_list_bitmap[i].journal_list) {
break ;
}
} else {
break ;
}
}
if (jb->journal_list) { /* double check to make sure if flushed correctly */
return NULL ;
}
jb->journal_list = jl ;
return jb ;
}
/*
** allocates a new chunk of X nodes, and links them all together as a list.
** Uses the cnode->next and cnode->prev pointers
** returns NULL on failure
*/
static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) {
struct reiserfs_journal_cnode *head ;
int i ;
if (num_cnodes <= 0) {
return NULL ;
}
head = vmalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
if (!head) {
return NULL ;
}
memset(head, 0, num_cnodes * sizeof(struct reiserfs_journal_cnode)) ;
head[0].prev = NULL ;
head[0].next = head + 1 ;
for (i = 1 ; i < num_cnodes; i++) {
head[i].prev = head + (i - 1) ;
head[i].next = head + (i + 1) ; /* if last one, overwrite it after the if */
}
head[num_cnodes -1].next = NULL ;
return head ;
}
/*
** pulls a cnode off the free list, or returns NULL on failure
*/
static struct reiserfs_journal_cnode *get_cnode(struct super_block *p_s_sb) {
struct reiserfs_journal_cnode *cn ;
reiserfs_check_lock_depth("get_cnode") ;
if (SB_JOURNAL(p_s_sb)->j_cnode_free <= 0) {
return NULL ;
}
SB_JOURNAL(p_s_sb)->j_cnode_used++ ;
SB_JOURNAL(p_s_sb)->j_cnode_free-- ;
cn = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
if (!cn) {
return cn ;
}
if (cn->next) {
cn->next->prev = NULL ;
}
SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn->next ;
memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ;
return cn ;
}
/*
** returns a cnode to the free list
*/
static void free_cnode(struct super_block *p_s_sb, struct reiserfs_journal_cnode *cn) {
reiserfs_check_lock_depth("free_cnode") ;
SB_JOURNAL(p_s_sb)->j_cnode_used-- ;
SB_JOURNAL(p_s_sb)->j_cnode_free++ ;
/* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
cn->next = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
if (SB_JOURNAL(p_s_sb)->j_cnode_free_list) {
SB_JOURNAL(p_s_sb)->j_cnode_free_list->prev = cn ;
}
cn->prev = NULL ; /* not needed with the memset, but I might kill the memset, and forget to do this */
SB_JOURNAL(p_s_sb)->j_cnode_free_list = cn ;
}
static int clear_prepared_bits(struct buffer_head *bh) {
clear_bit(BH_JPrepared, &bh->b_state) ;
return 0 ;
}
/* buffer is in current transaction */
inline int buffer_journaled(const struct buffer_head *bh) {
if (bh)
return test_bit(BH_JDirty, ( struct buffer_head * ) &bh->b_state) ;
else
return 0 ;
}
/* disk block was taken off free list before being in a finished transation, or written to disk
** journal_new blocks can be reused immediately, for any purpose
*/
inline int buffer_journal_new(const struct buffer_head *bh) {
if (bh)
return test_bit(BH_JNew, ( struct buffer_head * )&bh->b_state) ;
else
return 0 ;
}
inline int mark_buffer_journal_new(struct buffer_head *bh) {
if (bh) {
set_bit(BH_JNew, &bh->b_state) ;
}
return 0 ;
}
inline int mark_buffer_not_journaled(struct buffer_head *bh) {
if (bh)
clear_bit(BH_JDirty, &bh->b_state) ;
return 0 ;
}
/* utility function to force a BUG if it is called without the big
** kernel lock held. caller is the string printed just before calling BUG()
*/
void reiserfs_check_lock_depth(char *caller) {
#ifdef CONFIG_SMP
if (current->lock_depth < 0) {
printk("%s called without kernel lock held\n", caller) ;
show_reiserfs_locks() ;
BUG() ;
}
#else
;
#endif
}
/* return a cnode with same dev, block number and size in table, or null if not found */
static inline struct reiserfs_journal_cnode *
get_journal_hash_dev(struct 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 ;
}
/* returns a cnode with same size, block number and dev as bh in the current transaction hash. NULL if not found */
static inline struct reiserfs_journal_cnode *get_journal_hash(struct super_block *p_s_sb, struct buffer_head *bh) {
struct reiserfs_journal_cnode *cn ;
if (bh) {
cn = get_journal_hash_dev(p_s_sb, SB_JOURNAL(p_s_sb)->j_hash_table, bh->b_blocknr);
}
else {
return (struct reiserfs_journal_cnode *)0 ;
}
return cn ;
}
/* once upon a time, the journal would deadlock. a lot. Now, when
** CONFIG_REISERFS_CHECK is defined, anytime someone enters a
** transaction, it pushes itself into this ugly static list, and pops
** itself off before calling journal_end. I made a SysRq key to dump
** the list, and tell me what the writers are when I'm deadlocked. */
/* are you depending on the compiler
to optimize this function away
everywhere it is called? It is not
obvious how this works, but I
suppose debugging code need not be
clear. -Hans */
static char *journal_writers[512] ;
int push_journal_writer(char *s) {
#ifdef CONFIG_REISERFS_CHECK
int i ;
for (i = 0 ; i < 512 ; i++) {
if (!journal_writers[i]) {
journal_writers[i] = s ;
return i ;
}
}
return -1 ;
#else
return 0 ;
#endif
}
int pop_journal_writer(int index) {
#ifdef CONFIG_REISERFS_CHECK
if (index >= 0) {
journal_writers[index] = NULL ;
}
#endif
return 0 ;
}
int dump_journal_writers(void) {
int i ;
for (i = 0 ; i < 512 ; i++) {
if (journal_writers[i]) {
printk("%d: %s\n", i, journal_writers[i]) ;
}
}
return 0 ;
}
/*
** this actually means 'can this block be reallocated yet?'. If you set search_all, a block can only be allocated
** if it is not in the current transaction, was not freed by the current transaction, and has no chance of ever
** being overwritten by a replay after crashing.
**
** If you don't set search_all, a block can only be allocated if it is not in the current transaction. Since deleting
** a block removes it from the current transaction, this case should never happen. If you don't set search_all, make
** sure you never write the block without logging it.
**
** next_zero_bit is a suggestion about the next block to try for find_forward.
** when bl is rejected because it is set in a journal list bitmap, we search
** for the next zero bit in the bitmap that rejected bl. Then, we return that
** through next_zero_bit for find_forward to try.
**
** Just because we return something in next_zero_bit does not mean we won't
** reject it on the next call to reiserfs_in_journal
**
*/
int reiserfs_in_journal(struct super_block *p_s_sb,
unsigned long bl, int search_all,
unsigned long *next_zero_bit) {
struct reiserfs_journal_cnode *cn ;
struct reiserfs_list_bitmap *jb ;
int i ;
int bmap_nr = bl / (p_s_sb->s_blocksize << 3) ;
int bit_nr = bl % (p_s_sb->s_blocksize << 3) ;
int tmp_bit ;
*next_zero_bit = 0 ; /* always start this at zero. */
/* we aren't logging all blocks are safe for reuse */
if (reiserfs_dont_log(p_s_sb)) {
return 0 ;
}
PROC_INFO_INC( p_s_sb, journal.in_journal );
/* If we aren't doing a search_all, this is a metablock, and it will be logged before use.
** if we crash before the transaction that freed it commits, this transaction won't
** have committed either, and the block will never be written
*/
if (search_all) {
for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
PROC_INFO_INC( p_s_sb, journal.in_journal_bitmap );
jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ;
if (jb->journal_list && jb->bitmaps[bmap_nr] &&
test_bit(bit_nr, jb->bitmaps[bmap_nr]->data)) {
tmp_bit = find_next_zero_bit((unsigned long *)
(jb->bitmaps[bmap_nr]->data),
p_s_sb->s_blocksize << 3, bit_nr+1) ;
*next_zero_bit = bmap_nr * (p_s_sb->s_blocksize << 3) + tmp_bit ;
return 1 ;
}
}
}
/* is it in any old transactions? */
if (search_all && (cn = get_journal_hash_dev(p_s_sb, SB_JOURNAL(p_s_sb)->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, SB_JOURNAL(p_s_sb)->j_hash_table, bl))) {
return 1;
}
PROC_INFO_INC( p_s_sb, journal.in_journal_reusable );
/* safe for reuse */
return 0 ;
}
/* insert cn into table
*/
inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) {
struct reiserfs_journal_cnode *cn_orig ;
cn_orig = journal_hash(table, cn->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 );
while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_wlock)) > 0) {
PROC_INFO_INC( p_s_sb, journal.lock_journal_wait );
sleep_on(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
}
atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 1) ;
}
/* unlock the current transaction */
inline static void unlock_journal(struct super_block *p_s_sb) {
atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wlock)) ;
wake_up(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
}
/*
** this used to be much more involved, and I'm keeping it just in case things get ugly again.
** it gets called by flush_commit_list, and cleans up any data stored about blocks freed during a
** transaction.
*/
static void cleanup_freed_for_journal_list(struct super_block *p_s_sb, struct reiserfs_journal_list *jl) {
struct reiserfs_list_bitmap *jb = jl->j_list_bitmap ;
if (jb) {
cleanup_bitmap_list(p_s_sb, jb) ;
}
jl->j_list_bitmap->journal_list = NULL ;
jl->j_list_bitmap = NULL ;
}
/*
** if this journal list still has commit blocks unflushed, send them to disk.
**
** log areas must be flushed in order (transaction 2 can't commit before transaction 1)
** Before the commit block can by written, every other log block must be safely on disk
**
*/
static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) {
int i, count ;
int index = 0 ;
int bn ;
int retry_count = 0 ;
int orig_commit_left = 0 ;
struct buffer_head *tbh = NULL ;
struct reiserfs_journal_list *other_jl ;
reiserfs_check_lock_depth("flush_commit_list") ;
if (atomic_read(&jl->j_older_commits_done)) {
return 0 ;
}
/* before we can put our commit blocks on disk, we have to make sure everyone older than
** us is on disk too
*/
if (jl->j_len <= 0) {
return 0 ;
}
if (flushall) {
/* we _must_ make sure the transactions are committed in order. Start with the
** index after this one, wrap all the way around
*/
index = (jl - SB_JOURNAL_LIST(s)) + 1 ;
for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
other_jl = SB_JOURNAL_LIST(s) + ( (index + i) % JOURNAL_LIST_COUNT) ;
if (other_jl && other_jl != jl && other_jl->j_len > 0 && other_jl->j_trans_id > 0 &&
other_jl->j_trans_id <= jl->j_trans_id && (atomic_read(&(jl->j_older_commits_done)) == 0)) {
flush_commit_list(s, other_jl, 0) ;
}
}
}
count = 0 ;
/* don't flush the commit list for the current transactoin */
if (jl == ((SB_JOURNAL_LIST(s) + SB_JOURNAL_LIST_INDEX(s)))) {
return 0 ;
}
/* make sure nobody is trying to flush this one at the same time */
if (atomic_read(&(jl->j_commit_flushing))) {
sleep_on(&(jl->j_commit_wait)) ;
if (flushall) {
atomic_set(&(jl->j_older_commits_done), 1) ;
}
return 0 ;
}
/* this commit is done, exit */
if (atomic_read(&(jl->j_commit_left)) <= 0) {
if (flushall) {
atomic_set(&(jl->j_older_commits_done), 1) ;
}
return 0 ;
}
/* keeps others from flushing while we are flushing */
atomic_set(&(jl->j_commit_flushing), 1) ;
if (jl->j_len > JOURNAL_TRANS_MAX) {
reiserfs_panic(s, "journal-512: flush_commit_list: length is %lu, list number %d\n", jl->j_len, jl - SB_JOURNAL_LIST(s)) ;
return 0 ;
}
orig_commit_left = atomic_read(&(jl->j_commit_left)) ;
/* start by checking all the commit blocks in this transaction.
** Add anyone not on disk into tbh. Stop checking once commit_left <= 1, because that means we
** only have the commit block left
*/
retry:
count = 0 ;
for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 && i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */
bn = reiserfs_get_journal_block(s) + (jl->j_start+i) % JOURNAL_BLOCK_COUNT;
tbh = sb_get_hash_table(s, bn) ;
/* kill this sanity check */
if (count > (orig_commit_left + 2)) {
reiserfs_panic(s, "journal-539: flush_commit_list: BAD count(%d) > orig_commit_left(%d)!\n", count, orig_commit_left) ;
}
if (tbh) {
if (buffer_locked(tbh)) { /* wait on it, redo it just to make sure */
wait_on_buffer(tbh) ;
if (!buffer_uptodate(tbh)) {
reiserfs_panic(s, "journal-584, buffer write failed\n") ;
}
}
if (buffer_dirty(tbh)) {
printk("journal-569: flush_commit_list, block already dirty!\n") ;
} else {
mark_buffer_dirty(tbh) ;
}
ll_rw_block(WRITE, 1, &tbh) ;
count++ ;
put_bh(tbh) ; /* once for our get_hash */
}
}
/* wait on everyone in tbh before writing commit block*/
if (count > 0) {
for (i = 0 ; atomic_read(&(jl->j_commit_left)) > 1 &&
i < (jl->j_len + 1) ; i++) { /* everything but commit_bh */
bn = reiserfs_get_journal_block(s) + (jl->j_start + i) % JOURNAL_BLOCK_COUNT ;
tbh = sb_get_hash_table(s, bn) ;
wait_on_buffer(tbh) ;
if (!buffer_uptodate(tbh)) {
reiserfs_panic(s, "journal-601, buffer write failed\n") ;
}
put_bh(tbh) ; /* once for our get_hash */
bforget(tbh) ; /* once due to original getblk in do_journal_end */
atomic_dec(&(jl->j_commit_left)) ;
}
}
if (atomic_read(&(jl->j_commit_left)) != 1) { /* just the commit_bh left, flush it without calling getblk for everyone */
if (retry_count < 2) {
printk("journal-582: flush_commit_list, not all log blocks on disk yet, trying again\n") ;
retry_count++ ;
goto retry;
}
reiserfs_panic(s, "journal-563: flush_commit_list: BAD, j_commit_left is %u, should be 1\n",
atomic_read(&(jl->j_commit_left)));
}
mark_buffer_dirty(jl->j_commit_bh) ;
ll_rw_block(WRITE, 1, &(jl->j_commit_bh)) ;
wait_on_buffer(jl->j_commit_bh) ;
if (!buffer_uptodate(jl->j_commit_bh)) {
reiserfs_panic(s, "journal-615: buffer write failed\n") ;
}
atomic_dec(&(jl->j_commit_left)) ;
bforget(jl->j_commit_bh) ;
/* now, every commit block is on the disk. It is safe to allow blocks freed during this transaction to be reallocated */
cleanup_freed_for_journal_list(s, jl) ;
if (flushall) {
atomic_set(&(jl->j_older_commits_done), 1) ;
}
atomic_set(&(jl->j_commit_flushing), 0) ;
wake_up(&(jl->j_commit_wait)) ;
s->s_dirt = 1 ;
return 0 ;
}
/*
** flush_journal_list frequently needs to find a newer transaction for a given block. This does that, or
** returns NULL if it can't find anything
*/
static struct reiserfs_journal_list *find_newer_jl_for_cn(struct reiserfs_journal_cnode *cn) {
struct super_block *sb = cn->sb;
unsigned long 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 ;
}
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_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) {
printk("block %lu, bh is %d, state %d\n", cn->blocknr, cn->bh ? 1: 0,
cn->state) ;
}
cn->state = 0 ;
remove_journal_hash(p_s_sb, SB_JOURNAL(p_s_sb)->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 ;
if (trans_id >= SB_JOURNAL(p_s_sb)->j_last_flush_trans_id) {
if (buffer_locked((SB_JOURNAL(p_s_sb)->j_header_bh))) {
wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ;
if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) {
reiserfs_panic(p_s_sb, "journal-699: buffer write failed\n") ;
}
}
SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ;
SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = offset ;
jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ;
jh->j_last_flush_trans_id = cpu_to_le32(trans_id) ;
jh->j_first_unflushed_offset = cpu_to_le32(offset) ;
jh->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ;
set_bit(BH_Dirty, &(SB_JOURNAL(p_s_sb)->j_header_bh->b_state)) ;
ll_rw_block(WRITE, 1, &(SB_JOURNAL(p_s_sb)->j_header_bh)) ;
wait_on_buffer((SB_JOURNAL(p_s_sb)->j_header_bh)) ;
if (!buffer_uptodate(SB_JOURNAL(p_s_sb)->j_header_bh)) {
printk( "reiserfs: journal-837: IO error during journal replay\n" );
return -EIO ;
}
}
return 0 ;
}
static int update_journal_header_block(struct super_block *p_s_sb,
unsigned long offset,
unsigned long trans_id) {
if (_update_journal_header_block(p_s_sb, offset, trans_id)) {
reiserfs_panic(p_s_sb, "journal-712: buffer write failed\n") ;
}
return 0 ;
}
/*
** flush any and all journal lists older than you are
** can only be called from flush_journal_list
*/
static int flush_older_journal_lists(struct super_block *p_s_sb, struct reiserfs_journal_list *jl, unsigned long trans_id) {
int i, index ;
struct reiserfs_journal_list *other_jl ;
index = jl - SB_JOURNAL_LIST(p_s_sb) ;
for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
other_jl = SB_JOURNAL_LIST(p_s_sb) + ((index + i) % JOURNAL_LIST_COUNT) ;
if (other_jl && other_jl->j_len > 0 &&
other_jl->j_trans_id > 0 &&
other_jl->j_trans_id < trans_id &&
other_jl != jl) {
/* do not flush all */
flush_journal_list(p_s_sb, other_jl, 0) ;
}
}
return 0 ;
}
static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) {
if (buffer_journaled(bh)) {
reiserfs_warning("clm-2084: pinned buffer %lu:%s sent to disk\n",
bh->b_blocknr, kdevname(bh->b_dev)) ;
}
mark_buffer_uptodate(bh, uptodate) ;
unlock_buffer(bh) ;
put_bh(bh) ;
}
static void submit_logged_buffer(struct buffer_head *bh) {
lock_buffer(bh) ;
get_bh(bh) ;
bh->b_end_io = reiserfs_end_buffer_io_sync ;
mark_buffer_notjournal_new(bh) ;
clear_bit(BH_Dirty, &bh->b_state) ;
submit_bh(WRITE, bh) ;
}
/* flush a journal list, both commit and real blocks
**
** always set flushall to 1, unless you are calling from inside
** flush_journal_list
**
** IMPORTANT. This can only be called while there are no journal writers,
** and the journal is locked. That means it can only be called from
** do_journal_end, or by journal_release
*/
static int flush_journal_list(struct super_block *s,
struct reiserfs_journal_list *jl, int flushall) {
struct reiserfs_journal_list *pjl ;
struct reiserfs_journal_cnode *cn, *last ;
int count ;
int was_jwait = 0 ;
int was_dirty = 0 ;
struct buffer_head *saved_bh ;
unsigned long j_len_saved = jl->j_len ;
if (j_len_saved <= 0) {
return 0 ;
}
if (atomic_read(&SB_JOURNAL(s)->j_wcount) != 0) {
reiserfs_warning("clm-2048: flush_journal_list called with wcount %d\n",
atomic_read(&SB_JOURNAL(s)->j_wcount)) ;
}
/* if someone is getting the commit list, we must wait for them */
while (atomic_read(&(jl->j_commit_flushing))) {
sleep_on(&(jl->j_commit_wait)) ;
}
/* if someone is flushing this list, we must wait for them */
while (atomic_read(&(jl->j_flushing))) {
sleep_on(&(jl->j_flush_wait)) ;
}
/* this list is now ours, we can change anything we want */
atomic_set(&(jl->j_flushing), 1) ;
count = 0 ;
if (j_len_saved > JOURNAL_TRANS_MAX) {
reiserfs_panic(s, "journal-715: flush_journal_list, length is %lu, list number %d\n", j_len_saved, jl - SB_JOURNAL_LIST(s)) ;
atomic_dec(&(jl->j_flushing)) ;
return 0 ;
}
/* if all the work is already done, get out of here */
if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
atomic_read(&(jl->j_commit_left)) <= 0) {
goto flush_older_and_return ;
}
/* start by putting the commit list on disk. This will also flush
** the commit lists of any olders transactions
*/
flush_commit_list(s, jl, 1) ;
/* are we done now? */
if (atomic_read(&(jl->j_nonzerolen)) <= 0 &&
atomic_read(&(jl->j_commit_left)) <= 0) {
goto flush_older_and_return ;
}
/* loop through each cnode, see if we need to write it,
** or wait on a more recent transaction, or just ignore it
*/
if (atomic_read(&(SB_JOURNAL(s)->j_wcount)) != 0) {
reiserfs_panic(s, "journal-844: panic journal list is flushing, wcount is not 0\n") ;
}
cn = jl->j_realblock ;
while(cn) {
was_jwait = 0 ;
was_dirty = 0 ;
saved_bh = NULL ;
/* blocknr of 0 is no longer in the hash, ignore it */
if (cn->blocknr == 0) {
goto free_cnode ;
}
pjl = find_newer_jl_for_cn(cn) ;
/* the order is important here. We check pjl to make sure we
** don't clear BH_JDirty_wait if we aren't the one writing this
** block to disk
*/
if (!pjl && cn->bh) {
saved_bh = cn->bh ;
/* we do this to make sure nobody releases the buffer while
** we are working with it
*/
get_bh(saved_bh) ;
if (buffer_journal_dirty(saved_bh)) {
was_jwait = 1 ;
mark_buffer_notjournal_dirty(saved_bh) ;
/* undo the inc from journal_mark_dirty */
put_bh(saved_bh) ;
}
if (can_dirty(cn)) {
was_dirty = 1 ;
}
}
/* if someone has this block in a newer transaction, just make
** sure they are commited, and don't try writing it to disk
*/
if (pjl) {
flush_commit_list(s, pjl, 1) ;
goto free_cnode ;
}
/* bh == NULL when the block got to disk on its own, OR,
** the block got freed in a future transaction
*/
if (saved_bh == NULL) {
goto free_cnode ;
}
/* this should never happen. kupdate_one_transaction has this list
** locked while it works, so we should never see a buffer here that
** is not marked JDirty_wait
*/
if ((!was_jwait) && !buffer_locked(saved_bh)) {
printk("journal-813: BAD! buffer %lu %cdirty %cjwait, not in a newer tranasction\n", saved_bh->b_blocknr,
was_dirty ? ' ' : '!', was_jwait ? ' ' : '!') ;
}
/* kupdate_one_transaction waits on the buffers it is writing, so we
** should never see locked buffers here
*/
if (buffer_locked(saved_bh)) {
printk("clm-2083: locked buffer %lu in flush_journal_list\n",
saved_bh->b_blocknr) ;
wait_on_buffer(saved_bh) ;
if (!buffer_uptodate(saved_bh)) {
reiserfs_panic(s, "journal-923: buffer write failed\n") ;
}
}
if (was_dirty) {
/* we inc again because saved_bh gets decremented at free_cnode */
get_bh(saved_bh) ;
set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
submit_logged_buffer(saved_bh) ;
count++ ;
} else {
printk("clm-2082: Unable to flush buffer %lu in flush_journal_list\n",
saved_bh->b_blocknr) ;
}
free_cnode:
last = cn ;
cn = cn->next ;
if (saved_bh) {
/* we incremented this to keep others from taking the buffer head away */
put_bh(saved_bh) ;
if (atomic_read(&(saved_bh->b_count)) < 0) {
printk("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 (!buffer_uptodate(cn->bh)) {
reiserfs_panic(s, "journal-949: buffer write failed\n") ;
}
refile_buffer(cn->bh) ;
brelse(cn->bh) ;
}
cn = cn->next ;
}
}
flush_older_and_return:
/* before we can update the journal header block, we _must_ flush all
** real blocks from all older transactions to disk. This is because
** once the header block is updated, this transaction will not be
** replayed after a crash
*/
if (flushall) {
flush_older_journal_lists(s, jl, jl->j_trans_id) ;
}
/* before we can remove everything from the hash tables for this
** transaction, we must make sure it can never be replayed
**
** since we are only called from do_journal_end, we know for sure there
** are no allocations going on while we are flushing journal lists. So,
** we only need to update the journal header block for the last list
** being flushed
*/
if (flushall) {
update_journal_header_block(s, (jl->j_start + jl->j_len + 2) % JOURNAL_BLOCK_COUNT, jl->j_trans_id) ;
}
remove_all_from_journal_list(s, jl, 0) ;
jl->j_len = 0 ;
atomic_set(&(jl->j_nonzerolen), 0) ;
jl->j_start = 0 ;
jl->j_realblock = NULL ;
jl->j_commit_bh = NULL ;
jl->j_trans_id = 0 ;
atomic_dec(&(jl->j_flushing)) ;
wake_up(&(jl->j_flush_wait)) ;
return 0 ;
}
static int kupdate_one_transaction(struct super_block *s,
struct reiserfs_journal_list *jl)
{
struct reiserfs_journal_list *pjl ; /* previous list for this cn */
struct reiserfs_journal_cnode *cn, *walk_cn ;
unsigned long blocknr ;
int run = 0 ;
int orig_trans_id = jl->j_trans_id ;
struct buffer_head *saved_bh ;
int ret = 0 ;
/* if someone is getting the commit list, we must wait for them */
while (atomic_read(&(jl->j_commit_flushing))) {
sleep_on(&(jl->j_commit_wait)) ;
}
/* if someone is flushing this list, we must wait for them */
while (atomic_read(&(jl->j_flushing))) {
sleep_on(&(jl->j_flush_wait)) ;
}
/* was it flushed while we slept? */
if (jl->j_len <= 0 || jl->j_trans_id != orig_trans_id) {
return 0 ;
}
/* this list is now ours, we can change anything we want */
atomic_set(&(jl->j_flushing), 1) ;
loop_start:
cn = jl->j_realblock ;
while(cn) {
saved_bh = NULL ;
/* if the blocknr == 0, this has been cleared from the hash,
** skip it
*/
if (cn->blocknr == 0) {
goto next ;
}
/* look for a more recent transaction that logged this
** buffer. Only the most recent transaction with a buffer in
** it is allowed to send that buffer to disk
*/
pjl = find_newer_jl_for_cn(cn) ;
if (run == 0 && !pjl && cn->bh && buffer_journal_dirty(cn->bh) &&
can_dirty(cn))
{
if (!test_bit(BH_JPrepared, &cn->bh->b_state)) {
set_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
submit_logged_buffer(cn->bh) ;
} else {
/* someone else is using this buffer. We can't
** send it to disk right now because they might
** be changing/logging it.
*/
ret = 1 ;
}
} else if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
clear_bit(BLOCK_NEEDS_FLUSH, &cn->state) ;
if (!pjl && cn->bh) {
wait_on_buffer(cn->bh) ;
}
/* check again, someone could have logged while we scheduled */
pjl = find_newer_jl_for_cn(cn) ;
/* before the JDirty_wait bit is set, the
** buffer is added to the hash list. So, if we are
** run in the middle of a do_journal_end, we will notice
** if this buffer was logged and added from the latest
** transaction. In this case, we don't want to decrement
** b_count
*/
if (!pjl && cn->bh && buffer_journal_dirty(cn->bh)) {
blocknr = cn->blocknr ;
walk_cn = cn ;
saved_bh= cn->bh ;
/* update all older transactions to show this block
** was flushed
*/
mark_buffer_notjournal_dirty(cn->bh) ;
while(walk_cn) {
if (walk_cn->bh && walk_cn->blocknr == blocknr &&
walk_cn->sb == cn->sb) {
if (walk_cn->jlist) {
atomic_dec(&(walk_cn->jlist->j_nonzerolen)) ;
}
walk_cn->bh = NULL ;
}
walk_cn = walk_cn->hnext ;
}
if (atomic_read(&saved_bh->b_count) < 1) {
reiserfs_warning("clm-2081: bad count on %lu\n",
saved_bh->b_blocknr) ;
}
brelse(saved_bh) ;
}
}
/*
** if the more recent transaction is committed to the log,
** this buffer can be considered flushed. Decrement our
** counters to reflect one less buffer that needs writing.
**
** note, this relies on all of the above code being
** schedule free once pjl comes back non-null.
*/
if (pjl && cn->bh && atomic_read(&pjl->j_commit_left) == 0) {
atomic_dec(&cn->jlist->j_nonzerolen) ;
cn->bh = NULL ;
}
next:
cn = cn->next ;
}
/* the first run through the loop sends all the dirty buffers to
** ll_rw_block.
** the second run through the loop does all the accounting
*/
if (run++ == 0) {
goto loop_start ;
}
atomic_set(&(jl->j_flushing), 0) ;
wake_up(&(jl->j_flush_wait)) ;
return ret ;
}
/* since we never give dirty buffers to bdflush/kupdate, we have to
** flush them ourselves. This runs through the journal lists, finds
** old metadata in need of flushing and sends it to disk.
** this does not end transactions, commit anything, or free
** cnodes.
**
** returns the highest transaction id that was flushed last time
*/
static unsigned long reiserfs_journal_kupdate(struct super_block *s) {
struct reiserfs_journal_list *jl ;
int i ;
int start ;
time_t age ;
int ret = 0 ;
start = SB_JOURNAL_LIST_INDEX(s) ;
/* safety check to prevent flush attempts during a mount */
if (start < 0) {
return 0 ;
}
i = (start + 1) % JOURNAL_LIST_COUNT ;
while(i != start) {
jl = SB_JOURNAL_LIST(s) + i ;
age = CURRENT_TIME - jl->j_timestamp ;
if (jl->j_len > 0 && // age >= (JOURNAL_MAX_COMMIT_AGE * 2) &&
atomic_read(&(jl->j_nonzerolen)) > 0 &&
atomic_read(&(jl->j_commit_left)) == 0) {
if (jl->j_trans_id == SB_JOURNAL(s)->j_trans_id) {
break ;
}
/* if ret was already 1, we want to preserve that */
ret |= kupdate_one_transaction(s, jl) ;
}
if (atomic_read(&(jl->j_nonzerolen)) > 0) {
ret |= 1 ;
}
i = (i + 1) % JOURNAL_LIST_COUNT ;
}
return ret ;
}
/*
** removes any nodes in table with name block and dev as bh.
** only touchs the hnext and hprev pointers.
*/
void remove_journal_hash(struct 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) {
vfree(SB_JOURNAL(p_s_sb)->j_cnode_free_orig) ;
free_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap) ;
free_bitmap_nodes(p_s_sb) ; /* must be after free_list_bitmaps */
if (SB_JOURNAL(p_s_sb)->j_header_bh) {
brelse(SB_JOURNAL(p_s_sb)->j_header_bh) ;
}
vfree(SB_JOURNAL(p_s_sb)) ;
}
/*
** call on unmount. Only set error to 1 if you haven't made your way out
** of read_super() yet. Any other caller must keep error at 0.
*/
static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, int error) {
struct reiserfs_transaction_handle myth ;
/* we only want to flush out transactions if we were called with error == 0
*/
if (!error && !(p_s_sb->s_flags & MS_RDONLY)) {
/* end the current trans */
do_journal_end(th, p_s_sb,10, FLUSH_ALL) ;
/* make sure something gets logged to force our way into the flush code */
journal_join(&myth, p_s_sb, 1) ;
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&myth, p_s_sb,1, FLUSH_ALL) ;
}
/* we decrement before we wake up, because the commit thread dies off
** when it has been woken up and the count is <= 0
*/
reiserfs_mounted_fs_count-- ;
wake_up(&reiserfs_commit_thread_wait) ;
sleep_on(&reiserfs_commit_thread_done) ;
free_journal_ram(p_s_sb) ;
return 0 ;
}
/*
** call on unmount. flush all journal trans, release all alloc'd ram
*/
int journal_release(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
return do_journal_release(th, p_s_sb, 0) ;
}
/*
** only call from an error condition inside reiserfs_read_super!
*/
int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb) {
return do_journal_release(th, p_s_sb, 1) ;
}
/* compares description block with commit block. returns 1 if they differ, 0 if they are the same */
static int journal_compare_desc_commit(struct super_block *p_s_sb, struct reiserfs_journal_desc *desc,
struct reiserfs_journal_commit *commit) {
if (le32_to_cpu(commit->j_trans_id) != le32_to_cpu(desc->j_trans_id) ||
le32_to_cpu(commit->j_len) != le32_to_cpu(desc->j_len) ||
le32_to_cpu(commit->j_len) > JOURNAL_TRANS_MAX ||
le32_to_cpu(commit->j_len) <= 0
) {
return 1 ;
}
return 0 ;
}
/* returns 0 if it did not find a description block
** returns -1 if it found a corrupt commit block
** returns 1 if both desc and commit were valid
*/
static int journal_transaction_is_valid(struct super_block *p_s_sb, struct buffer_head *d_bh, unsigned long *oldest_invalid_trans_id, unsigned long *newest_mount_id) {
struct reiserfs_journal_desc *desc ;
struct reiserfs_journal_commit *commit ;
struct buffer_head *c_bh ;
unsigned long offset ;
if (!d_bh)
return 0 ;
desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
if (le32_to_cpu(desc->j_len) > 0 && !memcmp(desc->j_magic, JOURNAL_DESC_MAGIC, 8)) {
if (oldest_invalid_trans_id && *oldest_invalid_trans_id && le32_to_cpu(desc->j_trans_id) > *oldest_invalid_trans_id) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-986: transaction "
"is valid returning because trans_id %d is greater than "
"oldest_invalid %lu\n", le32_to_cpu(desc->j_trans_id),
*oldest_invalid_trans_id);
return 0 ;
}
if (newest_mount_id && *newest_mount_id > le32_to_cpu(desc->j_mount_id)) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1087: transaction "
"is valid returning because mount_id %d is less than "
"newest_mount_id %lu\n", desc->j_mount_id,
*newest_mount_id) ;
return -1 ;
}
offset = d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb) ;
/* ok, we have a journal description block, lets see if the transaction was valid */
c_bh = sb_bread(p_s_sb, reiserfs_get_journal_block(p_s_sb) + ((offset + le32_to_cpu(desc->j_len) + 1) % JOURNAL_BLOCK_COUNT)) ;
if (!c_bh)
return 0 ;
commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
"journal_transaction_is_valid, commit offset %ld had bad "
"time %d or length %d\n",
c_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
le32_to_cpu(commit->j_trans_id),
le32_to_cpu(commit->j_len));
brelse(c_bh) ;
if (oldest_invalid_trans_id)
*oldest_invalid_trans_id = le32_to_cpu(desc->j_trans_id) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1004: "
"transaction_is_valid setting oldest invalid trans_id "
"to %d\n", le32_to_cpu(desc->j_trans_id)) ;
return -1;
}
brelse(c_bh) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1006: found valid "
"transaction start offset %lu, len %d id %d\n",
d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_trans_id)) ;
return 1 ;
} else {
return 0 ;
}
}
static void brelse_array(struct buffer_head **heads, int num) {
int i ;
for (i = 0 ; i < num ; i++) {
brelse(heads[i]) ;
}
}
/*
** given the start, and values for the oldest acceptable transactions,
** this either reads in a replays a transaction, or returns because the transaction
** is invalid, or too old.
*/
static int journal_read_transaction(struct super_block *p_s_sb, unsigned long cur_dblock, unsigned long oldest_start,
unsigned long oldest_trans_id, unsigned long newest_mount_id) {
struct reiserfs_journal_desc *desc ;
struct reiserfs_journal_commit *commit ;
unsigned long trans_id = 0 ;
struct buffer_head *c_bh ;
struct buffer_head *d_bh ;
struct buffer_head **log_blocks = NULL ;
struct buffer_head **real_blocks = NULL ;
unsigned long trans_offset ;
int i;
d_bh = sb_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 - reiserfs_get_journal_block(p_s_sb) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1037: "
"journal_read_transaction, offset %lu, len %d mount_id %d\n",
d_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
le32_to_cpu(desc->j_len), le32_to_cpu(desc->j_mount_id)) ;
if (le32_to_cpu(desc->j_trans_id) < oldest_trans_id) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1039: "
"journal_read_trans skipping because %lu is too old\n",
cur_dblock - reiserfs_get_journal_block(p_s_sb)) ;
brelse(d_bh) ;
return 1 ;
}
if (le32_to_cpu(desc->j_mount_id) != newest_mount_id) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1146: "
"journal_read_trans skipping because %d is != "
"newest_mount_id %lu\n", le32_to_cpu(desc->j_mount_id),
newest_mount_id) ;
brelse(d_bh) ;
return 1 ;
}
c_bh = sb_bread(p_s_sb, reiserfs_get_journal_block(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 1) % JOURNAL_BLOCK_COUNT)) ;
if (!c_bh) {
brelse(d_bh) ;
return 1 ;
}
commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
if (journal_compare_desc_commit(p_s_sb, desc, commit)) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal_read_transaction, "
"commit offset %ld had bad time %d or length %d\n",
c_bh->b_blocknr - reiserfs_get_journal_block(p_s_sb),
le32_to_cpu(commit->j_trans_id), le32_to_cpu(commit->j_len));
brelse(c_bh) ;
brelse(d_bh) ;
return 1;
}
trans_id = le32_to_cpu(desc->j_trans_id) ;
/* now we know we've got a good transaction, and it was inside the valid time ranges */
log_blocks = kmalloc(le32_to_cpu(desc->j_len) * sizeof(struct buffer_head *), GFP_NOFS) ;
real_blocks = kmalloc(le32_to_cpu(desc->j_len) * 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("journal-1169: kmalloc failed, unable to mount FS\n") ;
return -1 ;
}
/* get all the buffer heads */
for(i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
log_blocks[i] = sb_getblk(p_s_sb, reiserfs_get_journal_block(p_s_sb) + (trans_offset + 1 + i) % JOURNAL_BLOCK_COUNT);
if (i < JOURNAL_TRANS_HALF) {
real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(desc->j_realblock[i])) ;
} else {
real_blocks[i] = sb_getblk(p_s_sb, le32_to_cpu(commit->j_realblock[i - JOURNAL_TRANS_HALF])) ;
}
if (real_blocks[i]->b_blocknr >= reiserfs_get_journal_block(p_s_sb) &&
real_blocks[i]->b_blocknr < (reiserfs_get_journal_block(p_s_sb)+JOURNAL_BLOCK_COUNT)) {
reiserfs_warning("journal-1204: REPLAY FAILURE fsck required! Trying to replay onto a log block\n") ;
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, le32_to_cpu(desc->j_len), log_blocks) ;
for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
wait_on_buffer(log_blocks[i]) ;
if (!buffer_uptodate(log_blocks[i])) {
reiserfs_warning("journal-1212: REPLAY FAILURE fsck required! buffer write failed\n") ;
brelse_array(log_blocks + i, le32_to_cpu(desc->j_len) - i) ;
brelse_array(real_blocks, le32_to_cpu(desc->j_len)) ;
brelse(c_bh) ;
brelse(d_bh) ;
kfree(log_blocks) ;
kfree(real_blocks) ;
return -1 ;
}
memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size) ;
mark_buffer_uptodate(real_blocks[i], 1) ;
brelse(log_blocks[i]) ;
}
/* flush out the real blocks */
for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
set_bit(BH_Dirty, &(real_blocks[i]->b_state)) ;
ll_rw_block(WRITE, 1, real_blocks + i) ;
}
for (i = 0 ; i < le32_to_cpu(desc->j_len) ; i++) {
wait_on_buffer(real_blocks[i]) ;
if (!buffer_uptodate(real_blocks[i])) {
reiserfs_warning("journal-1226: REPLAY FAILURE, fsck required! buffer write failed\n") ;
brelse_array(real_blocks + i, le32_to_cpu(desc->j_len) - i) ;
brelse(c_bh) ;
brelse(d_bh) ;
kfree(log_blocks) ;
kfree(real_blocks) ;
return -1 ;
}
brelse(real_blocks[i]) ;
}
cur_dblock = reiserfs_get_journal_block(p_s_sb) + ((trans_offset + le32_to_cpu(desc->j_len) + 2) % JOURNAL_BLOCK_COUNT) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal "
"start to offset %ld\n",
cur_dblock - reiserfs_get_journal_block(p_s_sb)) ;
/* init starting values for the first transaction, in case this is the last transaction to be replayed. */
SB_JOURNAL(p_s_sb)->j_start = cur_dblock - reiserfs_get_journal_block(p_s_sb) ;
SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = trans_id ;
SB_JOURNAL(p_s_sb)->j_trans_id = trans_id + 1;
brelse(c_bh) ;
brelse(d_bh) ;
kfree(log_blocks) ;
kfree(real_blocks) ;
return 0 ;
}
/*
** read and replay the log
** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
** transaction. This tests that before finding all the transactions in the log, whic makes normal mount times fast.
**
** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
**
** On exit, it sets things up so the first transaction will work correctly.
*/
static int journal_read(struct super_block *p_s_sb) {
struct reiserfs_journal_desc *desc ;
unsigned long last_flush_trans_id = 0 ;
unsigned long oldest_trans_id = 0;
unsigned long oldest_invalid_trans_id = 0 ;
time_t start ;
unsigned long last_flush_start = 0;
unsigned long oldest_start = 0;
unsigned long cur_dblock = 0 ;
unsigned long newest_mount_id = 9 ;
struct buffer_head *d_bh ;
struct reiserfs_journal_header *jh ;
int valid_journal_header = 0 ;
int replay_count = 0 ;
int continue_replay = 1 ;
int ret ;
cur_dblock = reiserfs_get_journal_block(p_s_sb) ;
printk("reiserfs: checking transaction log (device %s) ...\n", p_s_sb->s_id) ;
start = CURRENT_TIME ;
/* step 1, read in the journal header block. Check the transaction it says
** is the first unflushed, and if that transaction is not valid,
** replay is done
*/
SB_JOURNAL(p_s_sb)->j_header_bh = sb_bread(p_s_sb,
reiserfs_get_journal_block(p_s_sb) +
JOURNAL_BLOCK_COUNT) ;
if (!SB_JOURNAL(p_s_sb)->j_header_bh) {
return 1 ;
}
jh = (struct reiserfs_journal_header *)(SB_JOURNAL(p_s_sb)->j_header_bh->b_data) ;
if (le32_to_cpu(jh->j_first_unflushed_offset) >= 0 &&
le32_to_cpu(jh->j_first_unflushed_offset) < JOURNAL_BLOCK_COUNT &&
le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
last_flush_start = reiserfs_get_journal_block(p_s_sb) +
le32_to_cpu(jh->j_first_unflushed_offset) ;
last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1153: found in "
"header: first_unflushed_offset %d, last_flushed_trans_id "
"%lu\n", le32_to_cpu(jh->j_first_unflushed_offset),
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 = sb_bread(p_s_sb, reiserfs_get_journal_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) ;
}
if (continue_replay && is_read_only(p_s_sb->s_dev)) {
printk("clm-2076: device is readonly, unable to replay log\n") ;
return -1 ;
}
if (continue_replay && (p_s_sb->s_flags & MS_RDONLY)) {
printk("Warning, log replay starting on readonly filesystem\n") ;
}
/* ok, there are transactions that need to be replayed. start with the first log block, find
** all the valid transactions, and pick out the oldest.
*/
while(continue_replay && cur_dblock < (reiserfs_get_journal_block(p_s_sb) + JOURNAL_BLOCK_COUNT)) {
d_bh = sb_bread(p_s_sb, cur_dblock) ;
ret = journal_transaction_is_valid(p_s_sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id) ;
if (ret == 1) {
desc = (struct reiserfs_journal_desc *)d_bh->b_data ;
if (oldest_start == 0) { /* init all oldest_ values */
oldest_trans_id = le32_to_cpu(desc->j_trans_id) ;
oldest_start = d_bh->b_blocknr ;
newest_mount_id = le32_to_cpu(desc->j_mount_id) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1179: Setting "
"oldest_start to offset %lu, trans_id %lu\n",
oldest_start - reiserfs_get_journal_block(p_s_sb),
oldest_trans_id) ;
} else if (oldest_trans_id > le32_to_cpu(desc->j_trans_id)) {
/* one we just read was older */
oldest_trans_id = le32_to_cpu(desc->j_trans_id) ;
oldest_start = d_bh->b_blocknr ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting "
"oldest_start to offset %lu, trans_id %lu\n",
oldest_start - reiserfs_get_journal_block(p_s_sb),
oldest_trans_id) ;
}
if (newest_mount_id < le32_to_cpu(desc->j_mount_id)) {
newest_mount_id = le32_to_cpu(desc->j_mount_id) ;
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
"newest_mount_id to %d\n", le32_to_cpu(desc->j_mount_id));
}
cur_dblock += le32_to_cpu(desc->j_len) + 2 ;
}
else {
cur_dblock++ ;
}
brelse(d_bh) ;
}
/* step three, starting at the oldest transaction, replay */
if (last_flush_start > 0) {
oldest_start = last_flush_start ;
oldest_trans_id = last_flush_trans_id ;
}
cur_dblock = oldest_start ;
if (oldest_trans_id) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay "
"from offset %lu, trans_id %lu\n",
cur_dblock - reiserfs_get_journal_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 = reiserfs_get_journal_block(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start ;
replay_count++ ;
}
if (oldest_trans_id == 0) {
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1225: No valid "
"transactions found\n") ;
}
/* j_start does not get set correctly if we don't replay any transactions.
** if we had a valid journal_header, set j_start to the first unflushed transaction value,
** copy the trans_id from the header
*/
if (valid_journal_header && replay_count == 0) {
SB_JOURNAL(p_s_sb)->j_start = le32_to_cpu(jh->j_first_unflushed_offset) ;
SB_JOURNAL(p_s_sb)->j_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
SB_JOURNAL(p_s_sb)->j_last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) ;
SB_JOURNAL(p_s_sb)->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
} else {
SB_JOURNAL(p_s_sb)->j_mount_id = newest_mount_id + 1 ;
}
reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
"newest_mount_id to %lu\n", SB_JOURNAL(p_s_sb)->j_mount_id) ;
SB_JOURNAL(p_s_sb)->j_first_unflushed_offset = SB_JOURNAL(p_s_sb)->j_start ;
if (replay_count > 0) {
printk("reiserfs: replayed %d transactions in %lu seconds\n", replay_count,
CURRENT_TIME - start) ;
}
if (!is_read_only(p_s_sb->s_dev) &&
_update_journal_header_block(p_s_sb, SB_JOURNAL(p_s_sb)->j_start,
SB_JOURNAL(p_s_sb)->j_last_flush_trans_id))
{
/* replay failed, caller must call free_journal_ram and abort
** the mount
*/
return -1 ;
}
return 0 ;
}
struct reiserfs_journal_commit_task {
struct super_block *p_s_sb ;
int jindex ;
int wake_on_finish ; /* if this is one, we wake the task_done queue, if it
** is zero, we free the whole struct on finish
*/
struct reiserfs_journal_commit_task *self ;
struct wait_queue *task_done ;
struct tq_struct task ;
} ;
static void reiserfs_journal_commit_task_func(struct reiserfs_journal_commit_task *ct) {
struct reiserfs_journal_list *jl ;
jl = SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex ;
flush_commit_list(ct->p_s_sb, SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex, 1) ;
if (jl->j_len > 0 && atomic_read(&(jl->j_nonzerolen)) > 0 &&
atomic_read(&(jl->j_commit_left)) == 0) {
kupdate_one_transaction(ct->p_s_sb, jl) ;
}
kfree(ct->self) ;
}
static void setup_commit_task_arg(struct reiserfs_journal_commit_task *ct,
struct super_block *p_s_sb,
int jindex) {
if (!ct) {
reiserfs_panic(NULL, "journal-1360: setup_commit_task_arg called with NULL struct\n") ;
}
ct->p_s_sb = p_s_sb ;
ct->jindex = jindex ;
ct->task_done = NULL ;
INIT_LIST_HEAD(&ct->task.list) ;
ct->task.sync = 0 ;
ct->task.routine = (void *)(void *)reiserfs_journal_commit_task_func ;
ct->self = ct ;
ct->task.data = (void *)ct ;
}
static void commit_flush_async(struct super_block *p_s_sb, int jindex) {
struct reiserfs_journal_commit_task *ct ;
/* using GFP_NOFS, GFP_KERNEL could try to flush inodes, which will try
** to start/join a transaction, which will deadlock
*/
ct = kmalloc(sizeof(struct reiserfs_journal_commit_task), GFP_NOFS) ;
if (ct) {
setup_commit_task_arg(ct, p_s_sb, jindex) ;
queue_task(&(ct->task), &reiserfs_commit_thread_tq);
wake_up(&reiserfs_commit_thread_wait) ;
} else {
#ifdef CONFIG_REISERFS_CHECK
reiserfs_warning("journal-1540: kmalloc failed, doing sync commit\n") ;
#endif
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ;
}
}
/*
** this is the commit thread. It is started with kernel_thread on
** FS mount, and journal_release() waits for it to exit.
**
** It could do a periodic commit, but there is a lot code for that
** elsewhere right now, and I only wanted to implement this little
** piece for starters.
**
** All we do here is sleep on the j_commit_thread_wait wait queue, and
** then run the per filesystem commit task queue when we wakeup.
*/
static int reiserfs_journal_commit_thread(void *nullp) {
daemonize() ;
spin_lock_irq(&current->sigmask_lock);
sigfillset(&current->blocked);
recalc_sigpending(current);
spin_unlock_irq(&current->sigmask_lock);
sprintf(current->comm, "kreiserfsd") ;
lock_kernel() ;
while(1) {
while(TQ_ACTIVE(reiserfs_commit_thread_tq)) {
run_task_queue(&reiserfs_commit_thread_tq) ;
}
/* if there aren't any more filesystems left, break */
if (reiserfs_mounted_fs_count <= 0) {
run_task_queue(&reiserfs_commit_thread_tq) ;
break ;
}
wake_up(&reiserfs_commit_thread_done) ;
interruptible_sleep_on_timeout(&reiserfs_commit_thread_wait, 5) ;
}
unlock_kernel() ;
wake_up(&reiserfs_commit_thread_done) ;
return 0 ;
}
static void journal_list_init(struct super_block *p_s_sb) {
int i ;
for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_commit_wait)) ;
init_waitqueue_head(&(SB_JOURNAL_LIST(p_s_sb)[i].j_flush_wait)) ;
}
}
/*
** must be called once on fs mount. calls journal_read for you
*/
int journal_init(struct super_block *p_s_sb) {
int num_cnodes = JOURNAL_BLOCK_COUNT * 2 ;
if (sizeof(struct reiserfs_journal_commit) != 4096 ||
sizeof(struct reiserfs_journal_desc) != 4096
) {
printk("journal-1249: commit or desc struct not 4096 %Zd %Zd\n", sizeof(struct reiserfs_journal_commit),
sizeof(struct reiserfs_journal_desc)) ;
return 1 ;
}
/* sanity check to make sure they don't overflow the journal */
if (JOURNAL_BLOCK_COUNT > reiserfs_get_journal_orig_size(p_s_sb)) {
printk("journal-1393: current JOURNAL_BLOCK_COUNT (%d) is too big. This FS was created with a journal size of %lu blocks\n",
JOURNAL_BLOCK_COUNT, reiserfs_get_journal_orig_size(p_s_sb)) ;
return 1 ;
}
SB_JOURNAL(p_s_sb) = vmalloc(sizeof (struct reiserfs_journal)) ;
if (!SB_JOURNAL(p_s_sb)) {
printk("journal-1256: unable to get memory for journal structure\n") ;
return 1 ;
}
memset(SB_JOURNAL(p_s_sb), 0, sizeof(struct reiserfs_journal)) ;
SB_JOURNAL(p_s_sb)->j_list_bitmap_index = 0 ;
SB_JOURNAL_LIST_INDEX(p_s_sb) = -10000 ; /* make sure flush_old_commits does not try to flush a list while replay is on */
/* clear out the journal list array */
memset(SB_JOURNAL_LIST(p_s_sb), 0, sizeof(struct reiserfs_journal_list) * JOURNAL_LIST_COUNT) ;
journal_list_init(p_s_sb) ;
memset(SB_JOURNAL(p_s_sb)->j_list_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)) ;
memset(journal_writers, 0, sizeof(char *) * 512) ; /* debug code */
INIT_LIST_HEAD(&SB_JOURNAL(p_s_sb)->j_bitmap_nodes) ;
INIT_LIST_HEAD(&(SB_JOURNAL(p_s_sb)->j_dummy_inode.i_dirty_buffers)) ;
reiserfs_allocate_list_bitmaps(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_bitmap,
SB_BMAP_NR(p_s_sb)) ;
allocate_bitmap_nodes(p_s_sb) ;
SB_JOURNAL(p_s_sb)->j_start = 0 ;
SB_JOURNAL(p_s_sb)->j_len = 0 ;
SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ;
SB_JOURNAL(p_s_sb)->j_bcount = 0 ;
SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ;
SB_JOURNAL(p_s_sb)->j_last = NULL ;
SB_JOURNAL(p_s_sb)->j_first = NULL ;
init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
init_waitqueue_head(&(SB_JOURNAL(p_s_sb)->j_wait)) ;
SB_JOURNAL(p_s_sb)->j_trans_id = 10 ;
SB_JOURNAL(p_s_sb)->j_mount_id = 10 ;
SB_JOURNAL(p_s_sb)->j_state = 0 ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_wlock), 0) ;
SB_JOURNAL(p_s_sb)->j_cnode_free_list = allocate_cnodes(num_cnodes) ;
SB_JOURNAL(p_s_sb)->j_cnode_free_orig = SB_JOURNAL(p_s_sb)->j_cnode_free_list ;
SB_JOURNAL(p_s_sb)->j_cnode_free = SB_JOURNAL(p_s_sb)->j_cnode_free_list ? num_cnodes : 0 ;
SB_JOURNAL(p_s_sb)->j_cnode_used = 0 ;
SB_JOURNAL(p_s_sb)->j_must_wait = 0 ;
init_journal_hash(p_s_sb) ;
SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb)) ;
if (!(SB_JOURNAL_LIST(p_s_sb)[0].j_list_bitmap)) {
reiserfs_warning("journal-2005, get_list_bitmap failed for journal list 0\n") ;
return 1 ;
}
if (journal_read(p_s_sb) < 0) {
reiserfs_warning("Replay Failure, unable to mount\n") ;
free_journal_ram(p_s_sb) ;
return 1 ;
}
SB_JOURNAL_LIST_INDEX(p_s_sb) = 0 ; /* once the read is done, we can set this
where it belongs */
INIT_LIST_HEAD (&SB_JOURNAL(p_s_sb)->j_prealloc_list);
if (reiserfs_dont_log (p_s_sb))
return 0;
reiserfs_mounted_fs_count++ ;
if (reiserfs_mounted_fs_count <= 1) {
kernel_thread((void *)(void *)reiserfs_journal_commit_thread, NULL,
CLONE_FS | CLONE_FILES | CLONE_VM) ;
}
return 0 ;
}
/*
** test for a polite end of the current transaction. Used by file_write, and should
** be used by delete to make sure they don't write more than can fit inside a single
** transaction
*/
int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) {
time_t now = CURRENT_TIME ;
if (reiserfs_dont_log(th->t_super))
return 0 ;
if ( SB_JOURNAL(th->t_super)->j_must_wait > 0 ||
(SB_JOURNAL(th->t_super)->j_len_alloc + new_alloc) >= JOURNAL_MAX_BATCH ||
atomic_read(&(SB_JOURNAL(th->t_super)->j_jlock)) ||
(now - SB_JOURNAL(th->t_super)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE ||
SB_JOURNAL(th->t_super)->j_cnode_free < (JOURNAL_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 super_block *s = th->t_super ;
SB_JOURNAL(s)->j_must_wait = 1 ;
set_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ;
return ;
}
/* this must be called without a transaction started, and does not
** require BKL
*/
void reiserfs_allow_writes(struct super_block *s) {
clear_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state) ;
wake_up(&SB_JOURNAL(s)->j_join_wait) ;
}
/* this must be called without a transaction started, and does not
** require BKL
*/
void reiserfs_wait_on_write_block(struct super_block *s) {
wait_event(SB_JOURNAL(s)->j_join_wait,
!test_bit(WRITERS_BLOCKED, &SB_JOURNAL(s)->j_state)) ;
}
/* join == true if you must join an existing transaction.
** join == false if you can deal with waiting for others to finish
**
** this will block until the transaction is joinable. send the number of blocks you
** expect to use in nblocks.
*/
static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb,unsigned long nblocks,int join) {
time_t now = CURRENT_TIME ;
int old_trans_id ;
reiserfs_check_lock_depth("journal_begin") ;
RFALSE( p_s_sb->s_flags & MS_RDONLY,
"clm-2078: calling journal_begin on readonly FS") ;
if (reiserfs_dont_log(p_s_sb)) {
th->t_super = p_s_sb ; /* others will check this for the don't log flag */
return 0 ;
}
PROC_INFO_INC( p_s_sb, journal.journal_being );
relock:
lock_journal(p_s_sb) ;
if (test_bit(WRITERS_BLOCKED, &SB_JOURNAL(p_s_sb)->j_state)) {
unlock_journal(p_s_sb) ;
reiserfs_wait_on_write_block(p_s_sb) ;
PROC_INFO_INC( p_s_sb, journal.journal_relock_writers );
goto relock ;
}
/* if there is no room in the journal OR
** if this transaction is too old, and we weren't called joinable, wait for it to finish before beginning
** we don't sleep if there aren't other writers
*/
if ( (!join && SB_JOURNAL(p_s_sb)->j_must_wait > 0) ||
( !join && (SB_JOURNAL(p_s_sb)->j_len_alloc + nblocks + 2) >= JOURNAL_MAX_BATCH) ||
(!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0 && SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 &&
(now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) ||
(!join && atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) ) ||
(!join && SB_JOURNAL(p_s_sb)->j_cnode_free < (JOURNAL_TRANS_MAX * 3))) {
unlock_journal(p_s_sb) ; /* allow others to finish this transaction */
/* if writer count is 0, we can just force this transaction to end, and start
** a new one afterwards.
*/
if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) {
struct reiserfs_transaction_handle myth ;
journal_join(&myth, p_s_sb, 1) ;
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&myth, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&myth, p_s_sb,1,COMMIT_NOW) ;
} else {
/* but if the writer count isn't zero, we have to wait for the current writers to finish.
** They won't batch on transaction end once we set j_jlock
*/
atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ;
old_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) &&
SB_JOURNAL(p_s_sb)->j_trans_id == old_trans_id) {
sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
}
}
PROC_INFO_INC( p_s_sb, journal.journal_relock_wcount );
goto relock ;
}
if (SB_JOURNAL(p_s_sb)->j_trans_start_time == 0) { /* we are the first writer, set trans_id */
SB_JOURNAL(p_s_sb)->j_trans_start_time = now ;
}
atomic_inc(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
SB_JOURNAL(p_s_sb)->j_len_alloc += nblocks ;
th->t_blocks_logged = 0 ;
th->t_blocks_allocated = nblocks ;
th->t_super = p_s_sb ;
th->t_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
th->t_caller = "Unknown" ;
unlock_journal(p_s_sb) ;
p_s_sb->s_dirt = 1;
return 0 ;
}
int journal_join(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
return do_journal_begin_r(th, p_s_sb, nblocks, 1) ;
}
int journal_begin(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks) {
return do_journal_begin_r(th, p_s_sb, nblocks, 0) ;
}
/* not used at all */
int journal_prepare(struct super_block * p_s_sb, struct buffer_head *bh) {
return 0 ;
}
/*
** puts bh into the current transaction. If it was already there, reorders removes the
** old pointers from the hash, and puts new ones in (to make sure replay happen in the right order).
**
** if it was dirty, cleans and files onto the clean list. I can't let it be dirty again until the
** transaction is committed.
**
** if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
*/
int journal_mark_dirty(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) {
struct reiserfs_journal_cnode *cn = NULL;
int count_already_incd = 0 ;
int prepared = 0 ;
PROC_INFO_INC( p_s_sb, journal.mark_dirty );
if (reiserfs_dont_log(th->t_super)) {
mark_buffer_dirty(bh) ;
return 0 ;
}
if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) {
reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n",
th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id);
}
p_s_sb->s_dirt = 1 ;
prepared = test_and_clear_bit(BH_JPrepared, &bh->b_state) ;
/* already in this transaction, we are done */
if (buffer_journaled(bh)) {
PROC_INFO_INC( p_s_sb, journal.mark_dirty_already );
return 0 ;
}
/* this must be turned into a panic instead of a warning. We can't allow
** a dirty or journal_dirty or locked buffer to be logged, as some changes
** could get to disk too early. NOT GOOD.
*/
if (!prepared || buffer_locked(bh)) {
printk("journal-1777: buffer %lu bad state %cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT\n", bh->b_blocknr, prepared ? ' ' : '!',
buffer_locked(bh) ? ' ' : '!',
buffer_dirty(bh) ? ' ' : '!',
buffer_journal_dirty(bh) ? ' ' : '!') ;
show_reiserfs_locks() ;
}
count_already_incd = clear_prepared_bits(bh) ;
if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0) {
printk("journal-1409: journal_mark_dirty returning because j_wcount was %d\n", atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount))) ;
return 1 ;
}
/* this error means I've screwed up, and we've overflowed the transaction.
** Nothing can be done here, except make the FS readonly or panic.
*/
if (SB_JOURNAL(p_s_sb)->j_len >= JOURNAL_TRANS_MAX) {
reiserfs_panic(th->t_super, "journal-1413: journal_mark_dirty: j_len (%lu) is too big\n", SB_JOURNAL(p_s_sb)->j_len) ;
}
if (buffer_journal_dirty(bh)) {
count_already_incd = 1 ;
PROC_INFO_INC( p_s_sb, journal.mark_dirty_notjournal );
mark_buffer_notjournal_dirty(bh) ;
}
if (buffer_dirty(bh)) {
clear_bit(BH_Dirty, &bh->b_state) ;
}
if (buffer_journaled(bh)) { /* must double check after getting lock */
goto done ;
}
if (SB_JOURNAL(p_s_sb)->j_len > SB_JOURNAL(p_s_sb)->j_len_alloc) {
SB_JOURNAL(p_s_sb)->j_len_alloc = SB_JOURNAL(p_s_sb)->j_len + JOURNAL_PER_BALANCE_CNT ;
}
set_bit(BH_JDirty, &bh->b_state) ;
/* now put this guy on the end */
if (!cn) {
cn = get_cnode(p_s_sb) ;
if (!cn) {
reiserfs_panic(p_s_sb, "get_cnode failed!\n");
}
if (th->t_blocks_logged == th->t_blocks_allocated) {
th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT ;
SB_JOURNAL(p_s_sb)->j_len_alloc += JOURNAL_PER_BALANCE_CNT ;
}
th->t_blocks_logged++ ;
SB_JOURNAL(p_s_sb)->j_len++ ;
cn->bh = bh ;
cn->blocknr = bh->b_blocknr ;
cn->sb = p_s_sb;
cn->jlist = NULL ;
insert_journal_hash(SB_JOURNAL(p_s_sb)->j_hash_table, cn) ;
if (!count_already_incd) {
get_bh(bh) ;
}
}
cn->next = NULL ;
cn->prev = SB_JOURNAL(p_s_sb)->j_last ;
cn->bh = bh ;
if (SB_JOURNAL(p_s_sb)->j_last) {
SB_JOURNAL(p_s_sb)->j_last->next = cn ;
SB_JOURNAL(p_s_sb)->j_last = cn ;
} else {
SB_JOURNAL(p_s_sb)->j_first = cn ;
SB_JOURNAL(p_s_sb)->j_last = cn ;
}
done:
return 0 ;
}
/*
** if buffer already in current transaction, do a journal_mark_dirty
** otherwise, just mark it dirty and move on. Used for writes to meta blocks
** that don't need journaling
*/
int journal_mark_dirty_nolog(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, struct buffer_head *bh) {
if (reiserfs_dont_log(th->t_super) || buffer_journaled(bh) ||
buffer_journal_dirty(bh)) {
return journal_mark_dirty(th, p_s_sb, bh) ;
}
if (get_journal_hash_dev(p_s_sb, SB_JOURNAL(p_s_sb)->j_list_hash_table, bh->b_blocknr)) {
return journal_mark_dirty(th, p_s_sb, bh) ;
}
mark_buffer_dirty(bh) ;
return 0 ;
}
int journal_end(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
return do_journal_end(th, p_s_sb, nblocks, 0) ;
}
/* removes from the current transaction, relsing and descrementing any counters.
** also files the removed buffer directly onto the clean list
**
** called by journal_mark_freed when a block has been deleted
**
** returns 1 if it cleaned and relsed the buffer. 0 otherwise
*/
int remove_from_transaction(struct super_block *p_s_sb, unsigned long blocknr, int already_cleaned) {
struct buffer_head *bh ;
struct reiserfs_journal_cnode *cn ;
int ret = 0;
cn = get_journal_hash_dev(p_s_sb, SB_JOURNAL(p_s_sb)->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 == SB_JOURNAL(p_s_sb)->j_first) {
SB_JOURNAL(p_s_sb)->j_first = cn->next ;
}
if (cn == SB_JOURNAL(p_s_sb)->j_last) {
SB_JOURNAL(p_s_sb)->j_last = cn->prev ;
}
if (bh)
remove_journal_hash(p_s_sb, SB_JOURNAL(p_s_sb)->j_hash_table, NULL, bh->b_blocknr, 0) ;
mark_buffer_not_journaled(bh) ; /* don't log this one */
if (!already_cleaned) {
mark_buffer_notjournal_dirty(bh) ;
put_bh(bh) ;
if (atomic_read(&(bh->b_count)) < 0) {
printk("journal-1752: remove from trans, b_count < 0\n") ;
}
if (!buffer_locked(bh)) reiserfs_clean_and_file_buffer(bh) ;
ret = 1 ;
}
SB_JOURNAL(p_s_sb)->j_len-- ;
SB_JOURNAL(p_s_sb)->j_len_alloc-- ;
free_cnode(p_s_sb, cn) ;
return ret ;
}
/*
** for any cnode in a journal list, it can only be dirtied of all the
** transactions that include it are commited to disk.
** this checks through each transaction, and returns 1 if you are allowed to dirty,
** and 0 if you aren't
**
** it is called by dirty_journal_list, which is called after flush_commit_list has gotten all the log
** blocks for a given transaction on disk
**
*/
static int can_dirty(struct reiserfs_journal_cnode *cn) {
struct super_block *sb = cn->sb;
unsigned long blocknr = cn->blocknr ;
struct reiserfs_journal_cnode *cur = cn->hprev ;
int can_dirty = 1 ;
/* first test hprev. These are all newer than cn, so any node here
** with the name block number and dev means this node can't be sent
** to disk right now.
*/
while(cur && can_dirty) {
if (cur->jlist && cur->bh && cur->blocknr && cur->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/commited before returning
*/
int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
if (SB_JOURNAL(p_s_sb)->j_len == 0) {
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
}
return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT) ;
}
int show_reiserfs_locks(void) {
dump_journal_writers() ;
#if 0 /* debugging code for when we are compiled static don't delete */
p_s_sb = sb_entry(super_blocks.next);
while (p_s_sb != sb_entry(&super_blocks)) {
if (reiserfs_is_super(p_s_sb)) {
printk("journal lock is %d, join lock is %d, writers %d must wait is %d\n",
atomic_read(&(SB_JOURNAL(p_s_sb)->j_wlock)),
atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)),
atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)),
SB_JOURNAL(p_s_sb)->j_must_wait) ;
printk("used cnodes %d, free cnodes %d\n", SB_JOURNAL(p_s_sb)->j_cnode_used, SB_JOURNAL(p_s_sb)->j_cnode_free) ;
}
p_s_sb = sb_entry(p_s_sb->s_list.next);
}
#endif
return 0 ;
}
/*
** used to get memory back from async commits that are floating around
** and to reclaim any blocks deleted but unusable because their commits
** haven't hit disk yet. called from bitmap.c
**
** if it starts flushing things, it ors SCHEDULE_OCCURRED into repeat.
** note, this is just if schedule has a chance of occuring. I need to
** change flush_commit_lists to have a repeat parameter too.
**
*/
void flush_async_commits(struct super_block *p_s_sb) {
int i ;
for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) {
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ;
}
}
}
/*
** flushes any old transactions to disk
** ends the current transaction if it is too old
**
** also calls flush_journal_list with old_only == 1, which allows me to reclaim
** memory and such from the journal lists whose real blocks are all on disk.
**
** called by sync_dev_journal from buffer.c
*/
int flush_old_commits(struct super_block *p_s_sb, int immediate) {
int i ;
int count = 0;
int start ;
time_t now ;
struct reiserfs_transaction_handle th ;
start = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
now = CURRENT_TIME ;
/* safety check so we don't flush while we are replaying the log during mount */
if (SB_JOURNAL_LIST_INDEX(p_s_sb) < 0) {
return 0 ;
}
/* starting with oldest, loop until we get to the start */
i = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ;
while(i != start) {
if (SB_JOURNAL_LIST(p_s_sb)[i].j_len > 0 && ((now - SB_JOURNAL_LIST(p_s_sb)[i].j_timestamp) > JOURNAL_MAX_COMMIT_AGE ||
immediate)) {
/* we have to check again to be sure the current transaction did not change */
if (i != SB_JOURNAL_LIST_INDEX(p_s_sb)) {
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + i, 1) ;
}
}
i = (i + 1) % JOURNAL_LIST_COUNT ;
count++ ;
}
/* now, check the current transaction. If there are no writers, and it is too old, finish it, and
** force the commit blocks to disk
*/
if (!immediate && atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) <= 0 &&
SB_JOURNAL(p_s_sb)->j_trans_start_time > 0 &&
SB_JOURNAL(p_s_sb)->j_len > 0 &&
(now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) {
journal_join(&th, p_s_sb, 1) ;
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&th, p_s_sb,1, COMMIT_NOW) ;
} else if (immediate) { /* belongs above, but I wanted this to be very explicit as a special case. If they say to
flush, we must be sure old transactions hit the disk too. */
journal_join(&th, p_s_sb, 1) ;
reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
journal_mark_dirty(&th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
do_journal_end(&th, p_s_sb,1, COMMIT_NOW | WAIT) ;
}
reiserfs_journal_kupdate(p_s_sb) ;
return 0 ;
}
/*
** returns 0 if do_journal_end should return right away, returns 1 if do_journal_end should finish the commit
**
** if the current transaction is too old, but still has writers, this will wait on j_join_wait until all
** the writers are done. By the time it wakes up, the transaction it was called has already ended, so it just
** flushes the commit list and returns 0.
**
** Won't batch when flush or commit_now is set. Also won't batch when others are waiting on j_join_wait.
**
** Note, we can't allow the journal_end to proceed while there are still writers in the log.
*/
static int check_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb,
unsigned long nblocks, int flags) {
time_t now ;
int flush = flags & FLUSH_ALL ;
int commit_now = flags & COMMIT_NOW ;
int wait_on_commit = flags & WAIT ;
if (th->t_trans_id != SB_JOURNAL(p_s_sb)->j_trans_id) {
reiserfs_panic(th->t_super, "journal-1577: handle trans id %ld != current trans id %ld\n",
th->t_trans_id, SB_JOURNAL(p_s_sb)->j_trans_id);
}
SB_JOURNAL(p_s_sb)->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged) ;
if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) { /* <= 0 is allowed. unmounting might not call begin */
atomic_dec(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
}
/* BUG, deal with case where j_len is 0, but people previously freed blocks need to be released
** will be dealt with by next transaction that actually writes something, but should be taken
** care of in this trans
*/
if (SB_JOURNAL(p_s_sb)->j_len == 0) {
int wcount = atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) ;
unlock_journal(p_s_sb) ;
if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) > 0 && wcount <= 0) {
atomic_dec(&(SB_JOURNAL(p_s_sb)->j_jlock)) ;
wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
}
return 0 ;
}
/* if wcount > 0, and we are called to with flush or commit_now,
** we wait on j_join_wait. We will wake up when the last writer has
** finished the transaction, and started it on its way to the disk.
** Then, we flush the commit or journal list, and just return 0
** because the rest of journal end was already done for this transaction.
*/
if (atomic_read(&(SB_JOURNAL(p_s_sb)->j_wcount)) > 0) {
if (flush || commit_now) {
int orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 1) ;
if (flush) {
SB_JOURNAL(p_s_sb)->j_next_full_flush = 1 ;
}
unlock_journal(p_s_sb) ;
/* sleep while the current transaction is still j_jlocked */
while(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock)) &&
SB_JOURNAL(p_s_sb)->j_trans_id == th->t_trans_id) {
sleep_on(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
}
if (commit_now) {
if (wait_on_commit) {
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
} else {
commit_flush_async(p_s_sb, orig_jindex) ;
}
}
return 0 ;
}
unlock_journal(p_s_sb) ;
return 0 ;
}
/* deal with old transactions where we are the last writers */
now = CURRENT_TIME ;
if ((now - SB_JOURNAL(p_s_sb)->j_trans_start_time) > JOURNAL_MAX_TRANS_AGE) {
commit_now = 1 ;
SB_JOURNAL(p_s_sb)->j_next_async_flush = 1 ;
}
/* don't batch when someone is waiting on j_join_wait */
/* don't batch when syncing the commit or flushing the whole trans */
if (!(SB_JOURNAL(p_s_sb)->j_must_wait > 0) && !(atomic_read(&(SB_JOURNAL(p_s_sb)->j_jlock))) && !flush && !commit_now &&
(SB_JOURNAL(p_s_sb)->j_len < JOURNAL_MAX_BATCH) &&
SB_JOURNAL(p_s_sb)->j_len_alloc < JOURNAL_MAX_BATCH && SB_JOURNAL(p_s_sb)->j_cnode_free > (JOURNAL_TRANS_MAX * 3)) {
SB_JOURNAL(p_s_sb)->j_bcount++ ;
unlock_journal(p_s_sb) ;
return 0 ;
}
if (SB_JOURNAL(p_s_sb)->j_start > JOURNAL_BLOCK_COUNT) {
reiserfs_panic(p_s_sb, "journal-003: journal_end: j_start (%ld) is too high\n", SB_JOURNAL(p_s_sb)->j_start) ;
}
return 1 ;
}
/*
** Does all the work that makes deleting blocks safe.
** when deleting a block mark BH_JNew, just remove it from the current transaction, clean it's buffer_head and move on.
**
** otherwise:
** set a bit for the block in the journal bitmap. That will prevent it from being allocated for unformatted nodes
** before this transaction has finished.
**
** mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. That will prevent any old transactions with
** this block from trying to flush to the real location. Since we aren't removing the cnode from the journal_list_hash,
** the block can't be reallocated yet.
**
** Then remove it from the current transaction, decrementing any counters and filing it on the clean list.
*/
int journal_mark_freed(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long blocknr) {
struct reiserfs_journal_cnode *cn = NULL ;
struct buffer_head *bh = NULL ;
struct reiserfs_list_bitmap *jb = NULL ;
int cleaned = 0 ;
if (reiserfs_dont_log(th->t_super)) {
bh = sb_get_hash_table(p_s_sb, blocknr) ;
if (bh && buffer_dirty (bh)) {
printk ("journal_mark_freed(dont_log): dirty buffer on hash list: %lx %ld\n", bh->b_state, blocknr);
BUG ();
}
brelse (bh);
return 0 ;
}
bh = sb_get_hash_table(p_s_sb, blocknr) ;
/* if it is journal new, we just remove it from this transaction */
if (bh && buffer_journal_new(bh)) {
mark_buffer_notjournal_new(bh) ;
clear_prepared_bits(bh) ;
cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
} else {
/* set the bit for this block in the journal bitmap for this transaction */
jb = SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap ;
if (!jb) {
reiserfs_panic(p_s_sb, "journal-1702: journal_mark_freed, journal_list_bitmap is NULL\n") ;
}
set_bit_in_list_bitmap(p_s_sb, blocknr, jb) ;
/* Note, the entire while loop is not allowed to schedule. */
if (bh) {
clear_prepared_bits(bh) ;
}
cleaned = remove_from_transaction(p_s_sb, blocknr, cleaned) ;
/* find all older transactions with this block, make sure they don't try to write it out */
cn = get_journal_hash_dev(p_s_sb,SB_JOURNAL(p_s_sb)->j_list_hash_table, blocknr) ;
while (cn) {
if (p_s_sb == cn->sb && blocknr == cn->blocknr) {
set_bit(BLOCK_FREED, &cn->state) ;
if (cn->bh) {
if (!cleaned) {
/* remove_from_transaction will brelse the buffer if it was
** in the current trans
*/
mark_buffer_notjournal_dirty(cn->bh) ;
cleaned = 1 ;
put_bh(cn->bh) ;
if (atomic_read(&(cn->bh->b_count)) < 0) {
printk("journal-2138: cn->bh->b_count < 0\n") ;
}
}
if (cn->jlist) { /* since we are clearing the bh, we MUST dec nonzerolen */
atomic_dec(&(cn->jlist->j_nonzerolen)) ;
}
cn->bh = NULL ;
}
}
cn = cn->hnext ;
}
}
if (bh) {
reiserfs_clean_and_file_buffer(bh) ;
put_bh(bh) ; /* get_hash grabs the buffer */
if (atomic_read(&(bh->b_count)) < 0) {
printk("journal-2165: bh->b_count < 0\n") ;
}
}
return 0 ;
}
void reiserfs_update_inode_transaction(struct inode *inode) {
inode->u.reiserfs_i.i_trans_index = SB_JOURNAL_LIST_INDEX(inode->i_sb);
inode->u.reiserfs_i.i_trans_id = SB_JOURNAL(inode->i_sb)->j_trans_id ;
}
static int reiserfs_inode_in_this_transaction(struct inode *inode) {
if (inode->u.reiserfs_i.i_trans_id == SB_JOURNAL(inode->i_sb)->j_trans_id ||
inode->u.reiserfs_i.i_trans_id == 0) {
return 1;
}
return 0 ;
}
void reiserfs_commit_for_inode(struct inode *inode) {
struct reiserfs_journal_list *jl ;
struct reiserfs_transaction_handle th ;
struct super_block *sb = inode->i_sb ;
jl = SB_JOURNAL_LIST(sb) + inode->u.reiserfs_i.i_trans_index ;
/* is it from the current transaction, or from an unknown transaction? */
if (reiserfs_inode_in_this_transaction(inode)) {
journal_join(&th, sb, 1) ;
reiserfs_update_inode_transaction(inode) ;
journal_end_sync(&th, sb, 1) ;
} else if (jl->j_trans_id == inode->u.reiserfs_i.i_trans_id) {
flush_commit_list(sb, jl, 1) ;
}
/* if the transaction id does not match, this list is long since flushed
** and we don't have to do anything here
*/
}
void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
struct buffer_head *bh) {
PROC_INFO_INC( p_s_sb, journal.restore_prepared );
if (reiserfs_dont_log (p_s_sb))
return;
if (!bh) {
return ;
}
clear_bit(BH_JPrepared, &bh->b_state) ;
}
extern struct tree_balance *cur_tb ;
/*
** before we can change a metadata block, we have to make sure it won't
** be written to disk while we are altering it. So, we must:
** clean it
** wait on it.
**
*/
void reiserfs_prepare_for_journal(struct super_block *p_s_sb,
struct buffer_head *bh, int wait) {
int retry_count = 0 ;
PROC_INFO_INC( p_s_sb, journal.prepare );
if (reiserfs_dont_log (p_s_sb))
return;
while(!test_bit(BH_JPrepared, &bh->b_state) ||
(wait && buffer_locked(bh))) {
if (buffer_journaled(bh)) {
set_bit(BH_JPrepared, &bh->b_state) ;
return ;
}
set_bit(BH_JPrepared, &bh->b_state) ;
if (wait) {
RFALSE( buffer_locked(bh) && cur_tb != NULL,
"waiting while do_balance was running\n") ;
wait_on_buffer(bh) ;
}
PROC_INFO_INC( p_s_sb, journal.prepare_retry );
retry_count++ ;
}
}
/*
** long and ugly. If flush, will not return until all commit
** blocks and all real buffers in the trans are on disk.
** If no_async, won't return until all commit blocks are on disk.
**
** keep reading, there are comments as you go along
*/
static int do_journal_end(struct reiserfs_transaction_handle *th, struct super_block * p_s_sb, unsigned long nblocks,
int flags) {
struct reiserfs_journal_cnode *cn, *next, *jl_cn;
struct reiserfs_journal_cnode *last_cn = NULL;
struct reiserfs_journal_desc *desc ;
struct reiserfs_journal_commit *commit ;
struct buffer_head *c_bh ; /* commit bh */
struct buffer_head *d_bh ; /* desc bh */
int cur_write_start = 0 ; /* start index of current log write */
int cur_blocks_left = 0 ; /* number of journal blocks left to write */
int old_start ;
int i ;
int jindex ;
int orig_jindex ;
int flush = flags & FLUSH_ALL ;
int commit_now = flags & COMMIT_NOW ;
int wait_on_commit = flags & WAIT ;
struct reiserfs_super_block *rs ;
if (reiserfs_dont_log(th->t_super)) {
return 0 ;
}
lock_journal(p_s_sb) ;
if (SB_JOURNAL(p_s_sb)->j_next_full_flush) {
flags |= FLUSH_ALL ;
flush = 1 ;
}
if (SB_JOURNAL(p_s_sb)->j_next_async_flush) {
flags |= COMMIT_NOW ;
commit_now = 1 ;
}
/* check_journal_end locks the journal, and unlocks if it does not return 1
** it tells us if we should continue with the journal_end, or just return
*/
if (!check_journal_end(th, p_s_sb, nblocks, flags)) {
return 0 ;
}
/* check_journal_end might set these, check again */
if (SB_JOURNAL(p_s_sb)->j_next_full_flush) {
flush = 1 ;
}
if (SB_JOURNAL(p_s_sb)->j_next_async_flush) {
commit_now = 1 ;
}
/*
** j must wait means we have to flush the log blocks, and the real blocks for
** this transaction
*/
if (SB_JOURNAL(p_s_sb)->j_must_wait > 0) {
flush = 1 ;
}
#ifdef REISERFS_PREALLOCATE
reiserfs_discard_all_prealloc(th); /* it should not involve new blocks into
* the transaction */
#endif
rs = SB_DISK_SUPER_BLOCK(p_s_sb) ;
/* setup description block */
d_bh = sb_getblk(p_s_sb, reiserfs_get_journal_block(p_s_sb) + SB_JOURNAL(p_s_sb)->j_start) ;
mark_buffer_uptodate(d_bh, 1) ;
desc = (struct reiserfs_journal_desc *)(d_bh)->b_data ;
memset(desc, 0, sizeof(struct reiserfs_journal_desc)) ;
memcpy(desc->j_magic, JOURNAL_DESC_MAGIC, 8) ;
desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
/* setup commit block. Don't write (keep it clean too) this one until after everyone else is written */
c_bh = sb_getblk(p_s_sb, reiserfs_get_journal_block(p_s_sb) +
((SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 1) % JOURNAL_BLOCK_COUNT)) ;
commit = (struct reiserfs_journal_commit *)c_bh->b_data ;
memset(commit, 0, sizeof(struct reiserfs_journal_commit)) ;
commit->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
mark_buffer_uptodate(c_bh, 1) ;
/* init this journal list */
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_older_commits_done), 0) ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_trans_id = SB_JOURNAL(p_s_sb)->j_trans_id ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_timestamp = SB_JOURNAL(p_s_sb)->j_trans_start_time ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_bh = c_bh ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_start = SB_JOURNAL(p_s_sb)->j_start ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len = SB_JOURNAL(p_s_sb)->j_len ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_nonzerolen), SB_JOURNAL(p_s_sb)->j_len) ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_left), SB_JOURNAL(p_s_sb)->j_len + 2);
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = NULL ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ;
/* which is faster, locking/unlocking at the start and end of the for
** or locking once per iteration around the insert_journal_hash?
** eitherway, we are write locking insert_journal_hash. The ENTIRE FOR
** LOOP MUST not cause schedule to occur.
*/
/* for each real block, add it to the journal list hash,
** copy into real block index array in the commit or desc block
*/
for (i = 0, cn = SB_JOURNAL(p_s_sb)->j_first ; cn ; cn = cn->next, i++) {
if (test_bit(BH_JDirty, &cn->bh->b_state) ) {
jl_cn = get_cnode(p_s_sb) ;
if (!jl_cn) {
reiserfs_panic(p_s_sb, "journal-1676, get_cnode returned NULL\n") ;
}
if (i == 0) {
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_realblock = jl_cn ;
}
jl_cn->prev = last_cn ;
jl_cn->next = NULL ;
if (last_cn) {
last_cn->next = jl_cn ;
}
last_cn = jl_cn ;
if (cn->bh->b_blocknr >= reiserfs_get_journal_block(p_s_sb) &&
cn->bh->b_blocknr < (reiserfs_get_journal_block(p_s_sb) + JOURNAL_BLOCK_COUNT)) {
reiserfs_panic(p_s_sb, "journal-2332: Trying to log block %lu, which is a log block\n", cn->bh->b_blocknr) ;
}
jl_cn->blocknr = cn->bh->b_blocknr ;
jl_cn->state = 0 ;
jl_cn->sb = p_s_sb ;
jl_cn->bh = cn->bh ;
jl_cn->jlist = SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb) ;
insert_journal_hash(SB_JOURNAL(p_s_sb)->j_list_hash_table, jl_cn) ;
if (i < JOURNAL_TRANS_HALF) {
desc->j_realblock[i] = cpu_to_le32(cn->bh->b_blocknr) ;
} else {
commit->j_realblock[i - JOURNAL_TRANS_HALF] = cpu_to_le32(cn->bh->b_blocknr) ;
}
} else {
i-- ;
}
}
desc->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ;
desc->j_mount_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_mount_id) ;
desc->j_trans_id = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_trans_id) ;
commit->j_len = cpu_to_le32(SB_JOURNAL(p_s_sb)->j_len) ;
/* special check in case all buffers in the journal were marked for not logging */
if (SB_JOURNAL(p_s_sb)->j_len == 0) {
brelse(d_bh) ;
brelse(c_bh) ;
unlock_journal(p_s_sb) ;
printk("journal-2020: do_journal_end: BAD desc->j_len is ZERO\n") ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
return 0 ;
}
/* first data block is j_start + 1, so add one to cur_write_start wherever you use it */
cur_write_start = SB_JOURNAL(p_s_sb)->j_start ;
cur_blocks_left = SB_JOURNAL(p_s_sb)->j_len ;
cn = SB_JOURNAL(p_s_sb)->j_first ;
jindex = 1 ; /* start at one so we don't get the desc again */
while(cur_blocks_left > 0) {
/* copy all the real blocks into log area. dirty log blocks */
if (test_bit(BH_JDirty, &cn->bh->b_state)) {
struct buffer_head *tmp_bh ;
tmp_bh = sb_getblk(p_s_sb, reiserfs_get_journal_block(p_s_sb) +
((cur_write_start + jindex) % JOURNAL_BLOCK_COUNT)) ;
mark_buffer_uptodate(tmp_bh, 1) ;
memcpy(tmp_bh->b_data, cn->bh->b_data, cn->bh->b_size) ;
jindex++ ;
} else {
/* JDirty cleared sometime during transaction. don't log this one */
printk("journal-2048: do_journal_end: BAD, buffer in journal hash, but not JDirty!\n") ;
}
cn = cn->next ;
cur_blocks_left-- ;
}
/* we are done with both the c_bh and d_bh, but
** c_bh must be written after all other commit blocks,
** so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
*/
/* now loop through and mark all buffers from this transaction as JDirty_wait
** clear the JDirty bit, clear BH_JNew too.
** if they weren't JDirty, they weren't logged, just relse them and move on
*/
cn = SB_JOURNAL(p_s_sb)->j_first ;
while(cn) {
clear_bit(BH_JNew, &(cn->bh->b_state)) ;
if (test_bit(BH_JDirty, &(cn->bh->b_state))) {
set_bit(BH_JDirty_wait, &(cn->bh->b_state)) ;
clear_bit(BH_JDirty, &(cn->bh->b_state)) ;
} else {
brelse(cn->bh) ;
}
next = cn->next ;
free_cnode(p_s_sb, cn) ;
cn = next ;
}
/* unlock the journal list for committing and flushing */
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 0) ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 0) ;
orig_jindex = SB_JOURNAL_LIST_INDEX(p_s_sb) ;
jindex = (SB_JOURNAL_LIST_INDEX(p_s_sb) + 1) % JOURNAL_LIST_COUNT ;
SB_JOURNAL_LIST_INDEX(p_s_sb) = jindex ;
/* write any buffers that must hit disk before this commit is done */
fsync_inode_buffers(&(SB_JOURNAL(p_s_sb)->j_dummy_inode)) ;
/* honor the flush and async wishes from the caller */
if (flush) {
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex , 1) ;
} else if (commit_now) {
if (wait_on_commit) {
flush_commit_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + orig_jindex, 1) ;
} else {
commit_flush_async(p_s_sb, orig_jindex) ;
}
}
/* reset journal values for the next transaction */
old_start = SB_JOURNAL(p_s_sb)->j_start ;
SB_JOURNAL(p_s_sb)->j_start = (SB_JOURNAL(p_s_sb)->j_start + SB_JOURNAL(p_s_sb)->j_len + 2) % JOURNAL_BLOCK_COUNT;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_wcount), 0) ;
SB_JOURNAL(p_s_sb)->j_bcount = 0 ;
SB_JOURNAL(p_s_sb)->j_last = NULL ;
SB_JOURNAL(p_s_sb)->j_first = NULL ;
SB_JOURNAL(p_s_sb)->j_len = 0 ;
SB_JOURNAL(p_s_sb)->j_trans_start_time = 0 ;
SB_JOURNAL(p_s_sb)->j_trans_id++ ;
SB_JOURNAL(p_s_sb)->j_must_wait = 0 ;
SB_JOURNAL(p_s_sb)->j_len_alloc = 0 ;
SB_JOURNAL(p_s_sb)->j_next_full_flush = 0 ;
SB_JOURNAL(p_s_sb)->j_next_async_flush = 0 ;
init_journal_hash(p_s_sb) ;
/* if the next transaction has any chance of wrapping, flush
** transactions that might get overwritten. If any journal lists are very
** old flush them as well.
*/
for (i = 0 ; i < JOURNAL_LIST_COUNT ; i++) {
jindex = i ;
if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 && SB_JOURNAL(p_s_sb)->j_start <= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
if ((SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) >= SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1) ;
}
} else if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 &&
(SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) > JOURNAL_BLOCK_COUNT) {
if (((SB_JOURNAL(p_s_sb)->j_start + JOURNAL_TRANS_MAX + 1) % JOURNAL_BLOCK_COUNT) >=
SB_JOURNAL_LIST(p_s_sb)[jindex].j_start) {
flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ;
}
}
/* this check should always be run, to send old lists to disk */
if (SB_JOURNAL_LIST(p_s_sb)[jindex].j_len > 0 &&
SB_JOURNAL_LIST(p_s_sb)[jindex].j_timestamp <
(CURRENT_TIME - (JOURNAL_MAX_TRANS_AGE * 4))) {
flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + jindex, 1 ) ;
}
}
/* if the next journal_list is still in use, flush it */
if (SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_len != 0) {
flush_journal_list(p_s_sb, SB_JOURNAL_LIST(p_s_sb) + SB_JOURNAL_LIST_INDEX(p_s_sb), 1) ;
}
/* we don't want anyone flushing the new transaction's list */
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_commit_flushing), 1) ;
atomic_set(&(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_flushing), 1) ;
SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap = get_list_bitmap(p_s_sb, SB_JOURNAL_LIST(p_s_sb) +
SB_JOURNAL_LIST_INDEX(p_s_sb)) ;
if (!(SB_JOURNAL_LIST(p_s_sb)[SB_JOURNAL_LIST_INDEX(p_s_sb)].j_list_bitmap)) {
reiserfs_panic(p_s_sb, "journal-1996: do_journal_end, could not get a list bitmap\n") ;
}
unlock_journal(p_s_sb) ;
atomic_set(&(SB_JOURNAL(p_s_sb)->j_jlock), 0) ;
/* wake up any body waiting to join. */
wake_up(&(SB_JOURNAL(p_s_sb)->j_join_wait)) ;
return 0 ;
}