The reiserfs write lock replaced the BKL and uses similar semantics.
Frederic's locking code makes a distinction between when the lock is nested
and when it's being acquired/released, but I don't think that's the right
distinction to make.
The right distinction is between the lock being released at end-of-use and
the lock being released for a schedule. The unlock should return the depth
and the lock should restore it, rather than the other way around as it is now.
This patch implements that and adds a number of places where the lock
should be dropped.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
"reading failed", __func__, block);
else {
if (buffer_locked(bh)) {
+ int depth;
PROC_INFO_INC(sb, scan_bitmap.wait);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
__wait_on_buffer(bh);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
}
BUG_ON(!buffer_uptodate(bh));
BUG_ON(atomic_read(&bh->b_count) == 0);
char small_buf[32]; /* avoid kmalloc if we can */
struct reiserfs_dir_entry de;
int ret = 0;
+ int depth;
reiserfs_write_lock(inode->i_sb);
* Since filldir might sleep, we can release
* the write lock here for other waiters
*/
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
if (!dir_emit
(ctx, local_buf, d_reclen, d_ino,
DT_UNKNOWN)) {
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (local_buf != small_buf) {
kfree(local_buf);
}
goto end;
}
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (local_buf != small_buf) {
kfree(local_buf);
}
if (buffer_locked(*pcom_father)) {
/* Release the write lock while the buffer is busy */
- reiserfs_write_unlock(tb->tb_sb);
+ int depth = reiserfs_write_unlock_nested(tb->tb_sb);
__wait_on_buffer(*pcom_father);
- reiserfs_write_lock(tb->tb_sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (FILESYSTEM_CHANGED_TB(tb)) {
brelse(*pcom_father);
return REPEAT_SEARCH;
return REPEAT_SEARCH;
if (buffer_locked(bh)) {
- reiserfs_write_unlock(tb->tb_sb);
+ int depth = reiserfs_write_unlock_nested(tb->tb_sb);
__wait_on_buffer(bh);
- reiserfs_write_lock(tb->tb_sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (FILESYSTEM_CHANGED_TB(tb))
return REPEAT_SEARCH;
}
unsigned long son_number;
struct super_block *sb = tb->tb_sb;
struct buffer_head *bh;
+ int depth;
PROC_INFO_INC(sb, get_neighbors[h]);
tb->FL[h]) ? tb->lkey[h] : B_NR_ITEMS(tb->
FL[h]);
son_number = B_N_CHILD_NUM(tb->FL[h], child_position);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(tb->tb_sb);
bh = sb_bread(sb, son_number);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (!bh)
return IO_ERROR;
if (FILESYSTEM_CHANGED_TB(tb)) {
child_position =
(bh == tb->FR[h]) ? tb->rkey[h] + 1 : 0;
son_number = B_N_CHILD_NUM(tb->FR[h], child_position);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(tb->tb_sb);
bh = sb_bread(sb, son_number);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (!bh)
return IO_ERROR;
if (FILESYSTEM_CHANGED_TB(tb)) {
}
if (locked) {
+ int depth;
#ifdef CONFIG_REISERFS_CHECK
repeat_counter++;
if ((repeat_counter % 10000) == 0) {
REPEAT_SEARCH : CARRY_ON;
}
#endif
- reiserfs_write_unlock(tb->tb_sb);
+ depth = reiserfs_write_unlock_nested(tb->tb_sb);
__wait_on_buffer(locked);
- reiserfs_write_lock(tb->tb_sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (FILESYSTEM_CHANGED_TB(tb))
return REPEAT_SEARCH;
}
/* if it possible in indirect_to_direct conversion */
if (buffer_locked(tbS0)) {
- reiserfs_write_unlock(tb->tb_sb);
+ int depth = reiserfs_write_unlock_nested(tb->tb_sb);
__wait_on_buffer(tbS0);
- reiserfs_write_lock(tb->tb_sb);
+ reiserfs_write_lock_nested(tb->tb_sb, depth);
if (FILESYSTEM_CHANGED_TB(tb))
return REPEAT_SEARCH;
}
/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
- int depth;
reiserfs_delete_xattrs(inode);
- depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
if (journal_begin(&th, inode->i_sb, jbegin_count))
goto out;
remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
* about an error here */
out:
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
} else {
/* no object items are in the tree */
;
__le32 *item;
int done;
int fs_gen;
- int lock_depth;
struct reiserfs_transaction_handle *th = NULL;
/* space reserved in transaction batch:
. 3 balancings in direct->indirect conversion
loff_t new_offset =
(((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
version = get_inode_item_key_version(inode);
if (!file_capable(inode, block)) {
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
return -EFBIG;
}
/* find number of block-th logical block of the file */
ret = _get_block_create_0(inode, block, bh_result,
create | GET_BLOCK_READ_DIRECT);
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
return ret;
}
/*
if (!dangle && th)
retval = reiserfs_end_persistent_transaction(th);
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
/* the item was found, so new blocks were not added to the file
** there is no need to make sure the inode is updated with this
* long time. reschedule if needed and also release the write
* lock for others.
*/
- if (need_resched()) {
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
- schedule();
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
- }
+ reiserfs_cond_resched(inode->i_sb);
retval = search_for_position_by_key(inode->i_sb, &key, &path);
if (retval == IO_ERROR) {
retval = err;
}
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
reiserfs_check_path(&path);
return retval;
}
{
struct inode *inode;
struct reiserfs_iget_args args;
+ int depth;
args.objectid = key->on_disk_key.k_objectid;
args.dirid = key->on_disk_key.k_dir_id;
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
inode = iget5_locked(s, key->on_disk_key.k_objectid,
reiserfs_find_actor, reiserfs_init_locked_inode,
(void *)(&args));
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
if (!inode)
return ERR_PTR(-ENOMEM);
struct stat_data sd;
int retval;
int err;
+ int depth;
BUG_ON(!th->t_trans_id);
memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
err = insert_inode_locked4(inode, args.objectid,
reiserfs_find_actor, &args);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (err) {
err = -EINVAL;
goto out_bad_inode;
int error;
struct buffer_head *bh = NULL;
int err2;
- int lock_depth;
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
if (inode->i_size > 0) {
error = grab_tail_page(inode, &page, &bh);
page_cache_release(page);
}
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
return 0;
out:
page_cache_release(page);
}
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
return error;
}
struct inode *inode = page->mapping->host;
int ret;
int old_ref = 0;
+ int depth;
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
reiserfs_wait_on_write_block(inode->i_sb);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
fix_tail_page_for_writing(page);
if (reiserfs_transaction_running(inode->i_sb)) {
int update_sd = 0;
struct reiserfs_transaction_handle *th;
unsigned start;
- int lock_depth = 0;
bool locked = false;
if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
*/
if (pos + copied > inode->i_size) {
struct reiserfs_transaction_handle myth;
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
locked = true;
/* If the file have grown beyond the border where it
can have a tail, unmark it as needing a tail
}
if (th) {
if (!locked) {
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
locked = true;
}
if (!update_sd)
out:
if (locked)
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
unlock_page(page);
page_cache_release(page);
return ret == 0 ? copied : ret;
journal_error:
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
locked = false;
if (th) {
if (!update_sd)
int ret = 0;
int update_sd = 0;
struct reiserfs_transaction_handle *th = NULL;
+ int depth;
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
reiserfs_wait_on_write_block(inode->i_sb);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (reiserfs_transaction_running(inode->i_sb)) {
th = current->journal_info;
{
struct inode *inode = dentry->d_inode;
unsigned int ia_valid;
- int depth;
int error;
error = inode_change_ok(inode, attr);
if (is_quota_modification(inode, attr))
dquot_initialize(inode);
- depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
if (attr->ia_valid & ATTR_SIZE) {
/* version 2 items will be caught by the s_maxbytes check
** done for us in vmtruncate
*/
if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
attr->ia_size > MAX_NON_LFS) {
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
error = -EFBIG;
goto out;
}
error = err;
}
if (error) {
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
goto out;
}
/*
attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
}
}
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
if ((((attr->ia_valid & ATTR_UID) && (from_kuid(&init_user_ns, attr->ia_uid) & ~0xffff)) ||
((attr->ia_valid & ATTR_GID) && (from_kgid(&init_user_ns, attr->ia_gid) & ~0xffff))) &&
return error;
/* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
- depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
error = journal_begin(&th, inode->i_sb, jbegin_count);
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
if (error)
goto out;
error = dquot_transfer(inode, attr);
- depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
if (error) {
journal_end(&th, inode->i_sb, jbegin_count);
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
goto out;
}
inode->i_gid = attr->ia_gid;
mark_inode_dirty(inode);
error = journal_end(&th, inode->i_sb, jbegin_count);
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
if (error)
goto out;
}
int reiserfs_unpack(struct inode *inode, struct file *filp)
{
int retval = 0;
- int depth;
int index;
struct page *page;
struct address_space *mapping;
return 0;
}
- depth = reiserfs_write_lock_once(inode->i_sb);
-
/* we need to make sure nobody is changing the file size beneath us */
reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
+
write_from = inode->i_size & (blocksize - 1);
/* if we are on a block boundary, we are already unpacked. */
if (write_from == 0) {
out:
mutex_unlock(&inode->i_mutex);
- reiserfs_write_unlock_once(inode->i_sb, depth);
+ reiserfs_write_unlock(inode->i_sb);
return retval;
}
struct reiserfs_journal *j = SB_JOURNAL(s);
if (atomic_read(&j->j_async_throttle)) {
- reiserfs_write_unlock(s);
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(s);
congestion_wait(BLK_RW_ASYNC, HZ / 10);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
return 0;
struct reiserfs_journal *journal = SB_JOURNAL(s);
int retval = 0;
int write_len;
+ int depth;
reiserfs_check_lock_depth(s, "flush_commit_list");
* We might sleep in numerous places inside
* write_ordered_buffers. Relax the write lock.
*/
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
journal, jl, &jl->j_bh_list);
if (ret < 0 && retval == 0)
retval = ret;
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
BUG_ON(!list_empty(&jl->j_bh_list));
/*
tbh = journal_find_get_block(s, bn);
if (tbh) {
if (buffer_dirty(tbh)) {
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
ll_rw_block(WRITE, 1, &tbh);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
put_bh(tbh) ;
}
(jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
tbh = journal_find_get_block(s, bn);
- reiserfs_write_unlock(s);
- wait_on_buffer(tbh);
- reiserfs_write_lock(s);
+ depth = reiserfs_write_unlock_nested(s);
+ __wait_on_buffer(tbh);
+ reiserfs_write_lock_nested(s, depth);
// since we're using ll_rw_blk above, it might have skipped over
// a locked buffer. Double check here
//
/* redundant, sync_dirty_buffer() checks */
if (buffer_dirty(tbh)) {
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
sync_dirty_buffer(tbh);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
if (unlikely(!buffer_uptodate(tbh))) {
#ifdef CONFIG_REISERFS_CHECK
if (buffer_dirty(jl->j_commit_bh))
BUG();
mark_buffer_dirty(jl->j_commit_bh) ;
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
if (reiserfs_barrier_flush(s))
__sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
else
sync_dirty_buffer(jl->j_commit_bh);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
/* If there was a write error in the journal - we can't commit this
{
struct reiserfs_journal_header *jh;
struct reiserfs_journal *journal = SB_JOURNAL(sb);
+ int depth;
if (reiserfs_is_journal_aborted(journal))
return -EIO;
if (trans_id >= journal->j_last_flush_trans_id) {
if (buffer_locked((journal->j_header_bh))) {
- reiserfs_write_unlock(sb);
- wait_on_buffer((journal->j_header_bh));
- reiserfs_write_lock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
+ __wait_on_buffer(journal->j_header_bh);
+ reiserfs_write_lock_nested(sb, depth);
if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
#ifdef CONFIG_REISERFS_CHECK
reiserfs_warning(sb, "journal-699",
jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
set_buffer_dirty(journal->j_header_bh);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
if (reiserfs_barrier_flush(sb))
__sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
else
sync_dirty_buffer(journal->j_header_bh);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
if (!buffer_uptodate(journal->j_header_bh)) {
reiserfs_warning(sb, "journal-837",
"IO error during journal replay");
unsigned long j_len_saved = jl->j_len;
struct reiserfs_journal *journal = SB_JOURNAL(s);
int err = 0;
+ int depth;
BUG_ON(j_len_saved <= 0);
"cn->bh is NULL");
}
- reiserfs_write_unlock(s);
- wait_on_buffer(cn->bh);
- reiserfs_write_lock(s);
+ depth = reiserfs_write_unlock_nested(s);
+ __wait_on_buffer(cn->bh);
+ reiserfs_write_lock_nested(s, depth);
if (!cn->bh) {
reiserfs_panic(s, "journal-1012",
/* returns 0 if it did not find a description block
** returns -1 if it found a corrupt commit block
** returns 1 if both desc and commit were valid
+** NOTE: only called during fs mount
*/
static int journal_transaction_is_valid(struct super_block *sb,
struct buffer_head *d_bh,
/*
** 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.
+** this either reads in a replays a transaction, or returns because the
+** transaction is invalid, or too old.
+** NOTE: only called during fs mount
*/
static int journal_read_transaction(struct super_block *sb,
unsigned long cur_dblock,
ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
for (i = 0; i < get_desc_trans_len(desc); i++) {
- reiserfs_write_unlock(sb);
wait_on_buffer(log_blocks[i]);
- reiserfs_write_lock(sb);
-
if (!buffer_uptodate(log_blocks[i])) {
reiserfs_warning(sb, "journal-1212",
"REPLAY FAILURE fsck required! "
/*
** read and replay the log
-** on a clean unmount, the journal header's next unflushed pointer will be to an invalid
-** transaction. This tests that before finding all the transactions in the log, which makes normal mount times fast.
-**
-** After a crash, this starts with the next unflushed transaction, and replays until it finds one too old, or invalid.
-**
+** on a clean unmount, the journal header's next unflushed pointer will
+** be to an invalid transaction. This tests that before finding all the
+** transactions in the log, which makes normal mount times fast.
+** After a crash, this starts with the next unflushed transaction, and
+** replays until it finds one too old, or invalid.
** On exit, it sets things up so the first transaction will work correctly.
+** NOTE: only called during fs mount
*/
static int journal_read(struct super_block *sb)
{
"replayed %d transactions in %lu seconds\n",
replay_count, get_seconds() - start);
}
+ /* needed to satisfy the locking in _update_journal_header_block */
+ reiserfs_write_lock(sb);
if (!bdev_read_only(sb->s_bdev) &&
_update_journal_header_block(sb, journal->j_start,
journal->j_last_flush_trans_id)) {
+ reiserfs_write_unlock(sb);
/* replay failed, caller must call free_journal_ram and abort
** the mount
*/
return -1;
}
+ reiserfs_write_unlock(sb);
return 0;
}
goto free_and_return;
}
- /*
- * Journal_read needs to be inspected in order to push down
- * the lock further inside (or even remove it).
- */
- reiserfs_write_lock(sb);
ret = journal_read(sb);
- reiserfs_write_unlock(sb);
if (ret < 0) {
reiserfs_warning(sb, "reiserfs-2006",
"Replay Failure, unable to mount");
add_wait_queue(&journal->j_join_wait, &wait);
set_current_state(TASK_UNINTERRUPTIBLE);
if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
- reiserfs_write_unlock(s);
+ int depth = reiserfs_write_unlock_nested(s);
schedule();
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&journal->j_join_wait, &wait);
struct reiserfs_journal *journal = SB_JOURNAL(sb);
unsigned long bcount = journal->j_bcount;
while (1) {
- reiserfs_write_unlock(sb);
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(sb);
schedule_timeout_uninterruptible(1);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
+
journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
while ((atomic_read(&journal->j_wcount) > 0 ||
atomic_read(&journal->j_jlock)) &&
struct reiserfs_transaction_handle myth;
int sched_count = 0;
int retval;
+ int depth;
reiserfs_check_lock_depth(sb, "journal_begin");
BUG_ON(nblocks > journal->j_trans_max);
if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
unlock_journal(sb);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
reiserfs_wait_on_write_block(sb);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
PROC_INFO_INC(sb, journal.journal_relock_writers);
goto relock;
}
if (test_clear_buffer_journal_restore_dirty(bh) &&
buffer_journal_dirty(bh)) {
struct reiserfs_journal_cnode *cn;
+ reiserfs_write_lock(sb);
cn = get_journal_hash_dev(sb,
journal->j_list_hash_table,
bh->b_blocknr);
set_buffer_journal_test(bh);
mark_buffer_dirty(bh);
}
+ reiserfs_write_unlock(sb);
}
clear_buffer_journal_prepared(bh);
}
unsigned long jindex;
unsigned int commit_trans_id;
int trans_half;
+ int depth;
BUG_ON(th->t_refcount > 1);
BUG_ON(!th->t_trans_id);
next = cn->next;
free_cnode(sb, cn);
cn = next;
- reiserfs_write_unlock(sb);
- cond_resched();
- reiserfs_write_lock(sb);
+ reiserfs_cond_resched(sb);
}
/* we are done with both the c_bh and d_bh, but
* is lost.
*/
if (!list_empty(&jl->j_tail_bh_list)) {
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
write_ordered_buffers(&journal->j_dirty_buffers_lock,
journal, jl, &jl->j_tail_bh_list);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
}
BUG_ON(!list_empty(&jl->j_tail_bh_list));
mutex_unlock(&jl->j_commit_mutex);
}
}
-/*
- * If we already own the lock, just exit and don't increase the depth.
- * Useful when we don't want to lock more than once.
- *
- * We always return the lock_depth we had before calling
- * this function.
- */
-int reiserfs_write_lock_once(struct super_block *s)
+int __must_check reiserfs_write_unlock_nested(struct super_block *s)
{
struct reiserfs_sb_info *sb_i = REISERFS_SB(s);
+ int depth;
- if (sb_i->lock_owner != current) {
- mutex_lock(&sb_i->lock);
- sb_i->lock_owner = current;
- return sb_i->lock_depth++;
- }
+ /* this can happen when the lock isn't always held */
+ if (sb_i->lock_owner != current)
+ return -1;
+
+ depth = sb_i->lock_depth;
+
+ sb_i->lock_depth = -1;
+ sb_i->lock_owner = NULL;
+ mutex_unlock(&sb_i->lock);
- return sb_i->lock_depth;
+ return depth;
}
-void reiserfs_write_unlock_once(struct super_block *s, int lock_depth)
+void reiserfs_write_lock_nested(struct super_block *s, int depth)
{
- if (lock_depth == -1)
- reiserfs_write_unlock(s);
+ struct reiserfs_sb_info *sb_i = REISERFS_SB(s);
+
+ /* this can happen when the lock isn't always held */
+ if (depth == -1)
+ return;
+
+ mutex_lock(&sb_i->lock);
+ sb_i->lock_owner = current;
+ sb_i->lock_depth = depth;
}
/*
{
struct reiserfs_sb_info *sb_i = REISERFS_SB(sb);
- if (sb_i->lock_depth < 0)
- reiserfs_panic(sb, "%s called without kernel lock held %d",
- caller);
+ WARN_ON(sb_i->lock_depth < 0);
}
#ifdef CONFIG_REISERFS_CHECK
unsigned int flags)
{
int retval;
- int lock_depth;
struct inode *inode = NULL;
struct reiserfs_dir_entry de;
INITIALIZE_PATH(path_to_entry);
if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
return ERR_PTR(-ENAMETOOLONG);
- /*
- * Might be called with or without the write lock, must be careful
- * to not recursively hold it in case we want to release the lock
- * before rescheduling.
- */
- lock_depth = reiserfs_write_lock_once(dir->i_sb);
+ reiserfs_write_lock(dir->i_sb);
de.de_gen_number_bit_string = NULL;
retval =
inode = reiserfs_iget(dir->i_sb,
(struct cpu_key *)&(de.de_dir_id));
if (!inode || IS_ERR(inode)) {
- reiserfs_write_unlock_once(dir->i_sb, lock_depth);
+ reiserfs_write_unlock(dir->i_sb);
return ERR_PTR(-EACCES);
}
if (IS_PRIVATE(dir))
inode->i_flags |= S_PRIVATE;
}
- reiserfs_write_unlock_once(dir->i_sb, lock_depth);
+ reiserfs_write_unlock(dir->i_sb);
if (retval == IO_ERROR) {
return ERR_PTR(-EIO);
}
struct inode *inode;
struct reiserfs_transaction_handle th;
struct reiserfs_security_handle security;
- int lock_depth;
/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
int jbegin_count =
JOURNAL_PER_BALANCE_CNT * 3 +
return retval;
}
jbegin_count += retval;
- lock_depth = reiserfs_write_lock_once(dir->i_sb);
+ reiserfs_write_lock(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
d_instantiate(dentry, inode);
retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
- reiserfs_write_unlock_once(dir->i_sb, lock_depth);
+ reiserfs_write_unlock(dir->i_sb);
return retval;
}
struct reiserfs_transaction_handle th;
int jbegin_count;
unsigned long savelink;
- int depth;
dquot_initialize(dir);
JOURNAL_PER_BALANCE_CNT * 2 + 2 +
4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
- depth = reiserfs_write_lock_once(dir->i_sb);
+ reiserfs_write_lock(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval)
goto out_unlink;
retval = journal_end(&th, dir->i_sb, jbegin_count);
reiserfs_check_path(&path);
- reiserfs_write_unlock_once(dir->i_sb, depth);
+ reiserfs_write_unlock(dir->i_sb);
return retval;
end_unlink:
if (err)
retval = err;
out_unlink:
- reiserfs_write_unlock_once(dir->i_sb, depth);
+ reiserfs_write_unlock(dir->i_sb);
return retval;
}
dump_stack();
#endif
if (sb)
- panic(KERN_WARNING "REISERFS panic (device %s): %s%s%s: %s\n",
+ printk(KERN_WARNING "REISERFS panic (device %s): %s%s%s: %s\n",
sb->s_id, id ? id : "", id ? " " : "",
function, error_buf);
else
- panic(KERN_WARNING "REISERFS panic: %s%s%s: %s\n",
+ printk(KERN_WARNING "REISERFS panic: %s%s%s: %s\n",
id ? id : "", id ? " " : "", function, error_buf);
+ BUG();
}
void __reiserfs_error(struct super_block *sb, const char *id,
*/
void reiserfs_write_lock(struct super_block *s);
void reiserfs_write_unlock(struct super_block *s);
-int reiserfs_write_lock_once(struct super_block *s);
-void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
+int __must_check reiserfs_write_unlock_nested(struct super_block *s);
+void reiserfs_write_lock_nested(struct super_block *s, int depth);
#ifdef CONFIG_REISERFS_CHECK
void reiserfs_lock_check_recursive(struct super_block *s);
* - The inode mutex
*/
static inline void reiserfs_mutex_lock_safe(struct mutex *m,
- struct super_block *s)
+ struct super_block *s)
{
- reiserfs_lock_check_recursive(s);
- reiserfs_write_unlock(s);
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(s);
mutex_lock(m);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
static inline void
reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
- struct super_block *s)
+ struct super_block *s)
{
- reiserfs_lock_check_recursive(s);
- reiserfs_write_unlock(s);
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(s);
mutex_lock_nested(m, subclass);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
static inline void
reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s)
{
- reiserfs_lock_check_recursive(s);
- reiserfs_write_unlock(s);
- down_read(sem);
- reiserfs_write_lock(s);
+ int depth;
+ depth = reiserfs_write_unlock_nested(s);
+ down_read(sem);
+ reiserfs_write_lock_nested(s, depth);
}
/*
static inline void reiserfs_cond_resched(struct super_block *s)
{
if (need_resched()) {
- reiserfs_write_unlock(s);
+ int depth;
+
+ depth = reiserfs_write_unlock_nested(s);
schedule();
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
}
}
unsigned long int block_count, free_blocks;
int i;
int copy_size;
+ int depth;
sb = SB_DISK_SUPER_BLOCK(s);
}
/* check the device size */
+ depth = reiserfs_write_unlock_nested(s);
bh = sb_bread(s, block_count_new - 1);
+ reiserfs_write_lock_nested(s, depth);
if (!bh) {
printk("reiserfs_resize: can\'t read last block\n");
return -EINVAL;
* transaction begins, and the new bitmaps don't matter if the
* transaction fails. */
for (i = bmap_nr; i < bmap_nr_new; i++) {
+ int depth;
/* don't use read_bitmap_block since it will cache
* the uninitialized bitmap */
+ depth = reiserfs_write_unlock_nested(s);
bh = sb_bread(s, i * s->s_blocksize * 8);
+ reiserfs_write_lock_nested(s, depth);
if (!bh) {
vfree(bitmap);
return -EIO;
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(s);
sync_dirty_buffer(bh);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(s, depth);
// update bitmap_info stuff
bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
brelse(bh);
* the caller (search_by_key) will perform other schedule-unsafe
* operations just after calling this function.
*
- * @return true if we have unlocked
+ * @return depth of lock to be restored after read completes
*/
-static bool search_by_key_reada(struct super_block *s,
+static int search_by_key_reada(struct super_block *s,
struct buffer_head **bh,
b_blocknr_t *b, int num)
{
int i, j;
- bool unlocked = false;
+ int depth = -1;
for (i = 0; i < num; i++) {
bh[i] = sb_getblk(s, b[i]);
* you have to make sure the prepared bit isn't set on this buffer
*/
if (!buffer_uptodate(bh[j])) {
- if (!unlocked) {
- reiserfs_write_unlock(s);
- unlocked = true;
- }
+ if (depth == -1)
+ depth = reiserfs_write_unlock_nested(s);
ll_rw_block(READA, 1, bh + j);
}
brelse(bh[j]);
}
- return unlocked;
+ return depth;
}
/**************************************************************************
have a pointer to it. */
if ((bh = last_element->pe_buffer =
sb_getblk(sb, block_number))) {
- bool unlocked = false;
- if (!buffer_uptodate(bh) && reada_count > 1)
- /* may unlock the write lock */
- unlocked = search_by_key_reada(sb, reada_bh,
- reada_blocks, reada_count);
/*
- * If we haven't already unlocked the write lock,
- * then we need to do that here before reading
- * the current block
+ * We'll need to drop the lock if we encounter any
+ * buffers that need to be read. If all of them are
+ * already up to date, we don't need to drop the lock.
*/
- if (!buffer_uptodate(bh) && !unlocked) {
- reiserfs_write_unlock(sb);
- unlocked = true;
- }
+ int depth = -1;
+
+ if (!buffer_uptodate(bh) && reada_count > 1)
+ depth = search_by_key_reada(sb, reada_bh,
+ reada_blocks, reada_count);
+
+ if (!buffer_uptodate(bh) && depth == -1)
+ depth = reiserfs_write_unlock_nested(sb);
+
ll_rw_block(READ, 1, &bh);
wait_on_buffer(bh);
- if (unlocked)
- reiserfs_write_lock(sb);
+ if (depth != -1)
+ reiserfs_write_lock_nested(sb, depth);
if (!buffer_uptodate(bh))
goto io_error;
} else {
reiserfs_free_block(th, inode, block, 1);
}
- reiserfs_write_unlock(sb);
- cond_resched();
- reiserfs_write_lock(sb);
+ reiserfs_cond_resched(sb);
if (item_moved (&s_ih, path)) {
need_re_search = 1;
struct reiserfs_transaction_handle th;
int err = 0;
- int lock_depth;
if (inode->i_sb->s_flags & MS_RDONLY) {
reiserfs_warning(inode->i_sb, "clm-6006",
inode->i_ino);
return;
}
- lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ reiserfs_write_lock(inode->i_sb);
/* this is really only used for atime updates, so they don't have
** to be included in O_SYNC or fsync
journal_end(&th, inode->i_sb, 1);
out:
- reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ reiserfs_write_unlock(inode->i_sb);
}
static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
projects / deliverable / linux.git / commitdiff
