#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/uaccess.h>
+#include <linux/slab.h>
#include <asm/system.h>
journal_hash(table, cn->sb, cn->blocknr) = cn;
}
-/*
- * Several mutexes depend on the write lock.
- * However sometimes we want to relax the write lock while we hold
- * these mutexes, according to the release/reacquire on schedule()
- * properties of the Bkl that were used.
- * Reiserfs performances and locking were based on this scheme.
- * Now that the write lock is a mutex and not the bkl anymore, doing so
- * may result in a deadlock:
- *
- * A acquire write_lock
- * A acquire j_commit_mutex
- * A release write_lock and wait for something
- * B acquire write_lock
- * B can't acquire j_commit_mutex and sleep
- * A can't acquire write lock anymore
- * deadlock
- *
- * What we do here is avoiding such deadlock by playing the same game
- * than the Bkl: if we can't acquire a mutex that depends on the write lock,
- * we release the write lock, wait a bit and then retry.
- *
- * The mutexes concerned by this hack are:
- * - The commit mutex of a journal list
- * - The flush mutex
- * - The journal lock
- */
-static inline void reiserfs_mutex_lock_safe(struct mutex *m,
- struct super_block *s)
-{
- while (!mutex_trylock(m)) {
- reiserfs_write_unlock(s);
- schedule();
- reiserfs_write_lock(s);
- }
-}
-
/* lock the current transaction */
static inline void lock_journal(struct super_block *sb)
{
SB_ONDISK_JOURNAL_SIZE(s);
tbh = journal_find_get_block(s, bn);
if (tbh) {
- if (buffer_dirty(tbh))
- ll_rw_block(WRITE, 1, &tbh) ;
+ if (buffer_dirty(tbh)) {
+ reiserfs_write_unlock(s);
+ ll_rw_block(WRITE, 1, &tbh);
+ reiserfs_write_lock(s);
+ }
put_bh(tbh) ;
}
}
destroy_workqueue(commit_wq);
commit_wq = NULL;
}
- reiserfs_write_lock(sb);
free_journal_ram(sb);
+ reiserfs_write_lock(sb);
+
return 0;
}
brelse(d_bh);
return 1;
}
+
+ if (bdev_read_only(sb->s_bdev)) {
+ reiserfs_warning(sb, "clm-2076",
+ "device is readonly, unable to replay log");
+ brelse(c_bh);
+ brelse(d_bh);
+ return -EROFS;
+ }
+
trans_id = get_desc_trans_id(desc);
/* now we know we've got a good transaction, and it was inside the valid time ranges */
log_blocks = kmalloc(get_desc_trans_len(desc) *
goto start_log_replay;
}
- if (continue_replay && bdev_read_only(sb->s_bdev)) {
- reiserfs_warning(sb, "clm-2076",
- "device is readonly, unable to replay log");
- return -1;
- }
-
/* ok, there are transactions that need to be replayed. start with the first log block, find
** all the valid transactions, and pick out the oldest.
*/
struct reiserfs_journal *journal;
struct reiserfs_journal_list *jl;
char b[BDEVNAME_SIZE];
+ int ret;
+ /*
+ * Unlock here to avoid various RECLAIM-FS-ON <-> IN-RECLAIM-FS
+ * dependency inversion warnings.
+ */
+ reiserfs_write_unlock(sb);
journal = SB_JOURNAL(sb) = vmalloc(sizeof(struct reiserfs_journal));
if (!journal) {
reiserfs_warning(sb, "journal-1256",
"unable to get memory for journal structure");
+ reiserfs_write_lock(sb);
return 1;
}
memset(journal, 0, sizeof(struct reiserfs_journal));
INIT_LIST_HEAD(&journal->j_working_list);
INIT_LIST_HEAD(&journal->j_journal_list);
journal->j_persistent_trans = 0;
- if (reiserfs_allocate_list_bitmaps(sb,
- journal->j_list_bitmap,
- reiserfs_bmap_count(sb)))
+ ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
+ reiserfs_bmap_count(sb));
+ reiserfs_write_lock(sb);
+ if (ret)
goto free_and_return;
+
allocate_bitmap_nodes(sb);
/* reserved for journal area support */
goto free_and_return;
}
+ /*
+ * We need to unlock here to avoid creating the following
+ * dependency:
+ * reiserfs_lock -> sysfs_mutex
+ * Because the reiserfs mmap path creates the following dependency:
+ * mm->mmap -> reiserfs_lock, hence we have
+ * mm->mmap -> reiserfs_lock ->sysfs_mutex
+ * This would ends up in a circular dependency with sysfs readdir path
+ * which does sysfs_mutex -> mm->mmap_sem
+ * This is fine because the reiserfs lock is useless in mount path,
+ * at least until we call journal_begin. We keep it for paranoid
+ * reasons.
+ */
+ reiserfs_write_unlock(sb);
if (journal_init_dev(sb, journal, j_dev_name) != 0) {
+ reiserfs_write_lock(sb);
reiserfs_warning(sb, "sh-462",
"unable to initialize jornal device");
goto free_and_return;
}
+ reiserfs_write_lock(sb);
rs = SB_DISK_SUPER_BLOCK(sb);
journal->j_mount_id = 10;
journal->j_state = 0;
atomic_set(&(journal->j_jlock), 0);
+ reiserfs_write_unlock(sb);
journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
+ reiserfs_write_lock(sb);
journal->j_cnode_free_orig = journal->j_cnode_free_list;
journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
journal->j_cnode_used = 0;
}
reiserfs_mounted_fs_count++;
- if (reiserfs_mounted_fs_count <= 1)
+ if (reiserfs_mounted_fs_count <= 1) {
+ reiserfs_write_unlock(sb);
commit_wq = create_workqueue("reiserfs");
+ reiserfs_write_lock(sb);
+ }
INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
journal->j_work_sb = sb;
next = cn->next;
free_cnode(sb, cn);
cn = next;
+ reiserfs_write_unlock(sb);
cond_resched();
+ reiserfs_write_lock(sb);
}
/* we are done with both the c_bh and d_bh, but
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff