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-rw-r--r--fs/reiserfs/bitmap.c3
-rw-r--r--fs/reiserfs/journal.c64
-rw-r--r--fs/reiserfs/super.c54
3 files changed, 53 insertions, 68 deletions
diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
index a945cd26522..70de42f09f1 100644
--- a/fs/reiserfs/bitmap.c
+++ b/fs/reiserfs/bitmap.c
@@ -1364,10 +1364,7 @@ int reiserfs_init_bitmap_cache(struct super_block *sb)
struct reiserfs_bitmap_info *bitmap;
unsigned int bmap_nr = reiserfs_bmap_count(sb);
- /* Avoid lock recursion in fault case */
- reiserfs_write_unlock(sb);
bitmap = vmalloc(sizeof(*bitmap) * bmap_nr);
- reiserfs_write_lock(sb);
if (bitmap == NULL)
return -ENOMEM;
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index eb711060a6f..c3cf54fd4de 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -2678,16 +2678,10 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
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) = vzalloc(sizeof(struct reiserfs_journal));
if (!journal) {
reiserfs_warning(sb, "journal-1256",
"unable to get memory for journal structure");
- reiserfs_write_lock(sb);
return 1;
}
INIT_LIST_HEAD(&journal->j_bitmap_nodes);
@@ -2695,10 +2689,8 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
INIT_LIST_HEAD(&journal->j_working_list);
INIT_LIST_HEAD(&journal->j_journal_list);
journal->j_persistent_trans = 0;
- ret = reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
- reiserfs_bmap_count(sb));
- reiserfs_write_lock(sb);
- if (ret)
+ if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
+ reiserfs_bmap_count(sb)))
goto free_and_return;
allocate_bitmap_nodes(sb);
@@ -2727,27 +2719,11 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
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);
@@ -2829,9 +2805,7 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
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;
@@ -2848,24 +2822,37 @@ int journal_init(struct super_block *sb, const char *j_dev_name,
init_journal_hash(sb);
jl = journal->j_current_jl;
+
+ /*
+ * get_list_bitmap() may call flush_commit_list() which
+ * requires the lock. Calling flush_commit_list() shouldn't happen
+ * this early but I like to be paranoid.
+ */
+ reiserfs_write_lock(sb);
jl->j_list_bitmap = get_list_bitmap(sb, jl);
+ reiserfs_write_unlock(sb);
if (!jl->j_list_bitmap) {
reiserfs_warning(sb, "journal-2005",
"get_list_bitmap failed for journal list 0");
goto free_and_return;
}
- if (journal_read(sb) < 0) {
+
+ /*
+ * 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");
goto free_and_return;
}
reiserfs_mounted_fs_count++;
- if (reiserfs_mounted_fs_count <= 1) {
- reiserfs_write_unlock(sb);
+ if (reiserfs_mounted_fs_count <= 1)
commit_wq = alloc_workqueue("reiserfs", WQ_MEM_RECLAIM, 0);
- reiserfs_write_lock(sb);
- }
INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
journal->j_work_sb = sb;
@@ -2896,14 +2883,13 @@ int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
journal->j_cnode_free < (journal->j_trans_max * 3)) {
return 1;
}
- /* protected by the BKL here */
+
journal->j_len_alloc += new_alloc;
th->t_blocks_allocated += new_alloc ;
return 0;
}
-/* this must be called inside a transaction, and requires the
-** kernel_lock to be held
+/* this must be called inside a transaction
*/
void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
{
@@ -2914,8 +2900,7 @@ void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
return;
}
-/* this must be called without a transaction started, and does not
-** require BKL
+/* this must be called without a transaction started
*/
void reiserfs_allow_writes(struct super_block *s)
{
@@ -2924,8 +2909,7 @@ void reiserfs_allow_writes(struct super_block *s)
wake_up(&journal->j_join_wait);
}
-/* this must be called without a transaction started, and does not
-** require BKL
+/* this must be called without a transaction started
*/
void reiserfs_wait_on_write_block(struct super_block *s)
{
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 1d42e707d5f..e12d8b97cd4 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1519,9 +1519,7 @@ static int read_super_block(struct super_block *s, int offset)
static int reread_meta_blocks(struct super_block *s)
{
ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
- reiserfs_write_unlock(s);
wait_on_buffer(SB_BUFFER_WITH_SB(s));
- reiserfs_write_lock(s);
if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
reiserfs_warning(s, "reiserfs-2504", "error reading the super");
return 1;
@@ -1746,22 +1744,11 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
mutex_init(&REISERFS_SB(s)->lock);
REISERFS_SB(s)->lock_depth = -1;
- /*
- * This function is called with the bkl, which also was the old
- * locking used here.
- * do_journal_begin() will soon check if we hold the lock (ie: was the
- * bkl). This is likely because do_journal_begin() has several another
- * callers because at this time, it doesn't seem to be necessary to
- * protect against anything.
- * Anyway, let's be conservative and lock for now.
- */
- reiserfs_write_lock(s);
-
jdev_name = NULL;
if (reiserfs_parse_options
(s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
&commit_max_age, qf_names, &qfmt) == 0) {
- goto error;
+ goto error_unlocked;
}
if (jdev_name && jdev_name[0]) {
REISERFS_SB(s)->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
@@ -1777,7 +1764,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
if (blocks) {
SWARN(silent, s, "jmacd-7", "resize option for remount only");
- goto error;
+ goto error_unlocked;
}
/* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
@@ -1787,7 +1774,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
reiserfs_bdevname(s));
- goto error;
+ goto error_unlocked;
}
rs = SB_DISK_SUPER_BLOCK(s);
@@ -1803,7 +1790,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
"or increase size of your LVM partition");
SWARN(silent, s, "", "Or may be you forgot to "
"reboot after fdisk when it told you to");
- goto error;
+ goto error_unlocked;
}
sbi->s_mount_state = SB_REISERFS_STATE(s);
@@ -1811,8 +1798,9 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
if ((errval = reiserfs_init_bitmap_cache(s))) {
SWARN(silent, s, "jmacd-8", "unable to read bitmap");
- goto error;
+ goto error_unlocked;
}
+
errval = -EINVAL;
#ifdef CONFIG_REISERFS_CHECK
SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
@@ -1835,24 +1823,26 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
if (reiserfs_barrier_flush(s)) {
printk("reiserfs: using flush barriers\n");
}
+
// set_device_ro(s->s_dev, 1) ;
if (journal_init(s, jdev_name, old_format, commit_max_age)) {
SWARN(silent, s, "sh-2022",
"unable to initialize journal space");
- goto error;
+ goto error_unlocked;
} else {
jinit_done = 1; /* once this is set, journal_release must be called
** if we error out of the mount
*/
}
+
if (reread_meta_blocks(s)) {
SWARN(silent, s, "jmacd-9",
"unable to reread meta blocks after journal init");
- goto error;
+ goto error_unlocked;
}
if (replay_only(s))
- goto error;
+ goto error_unlocked;
if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
SWARN(silent, s, "clm-7000",
@@ -1866,9 +1856,19 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
reiserfs_init_locked_inode, (void *)(&args));
if (!root_inode) {
SWARN(silent, s, "jmacd-10", "get root inode failed");
- goto error;
+ goto error_unlocked;
}
+ /*
+ * This path assumed to be called with the BKL in the old times.
+ * Now we have inherited the big reiserfs lock from it and many
+ * reiserfs helpers called in the mount path and elsewhere require
+ * this lock to be held even if it's not always necessary. Let's be
+ * conservative and hold it early. The window can be reduced after
+ * careful review of the code.
+ */
+ reiserfs_write_lock(s);
+
if (root_inode->i_state & I_NEW) {
reiserfs_read_locked_inode(root_inode, &args);
unlock_new_inode(root_inode);
@@ -1995,12 +1995,16 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
return (0);
error:
- if (jinit_done) { /* kill the commit thread, free journal ram */
+ reiserfs_write_unlock(s);
+
+error_unlocked:
+ /* kill the commit thread, free journal ram */
+ if (jinit_done) {
+ reiserfs_write_lock(s);
journal_release_error(NULL, s);
+ reiserfs_write_unlock(s);
}
- reiserfs_write_unlock(s);
-
reiserfs_free_bitmap_cache(s);
if (SB_BUFFER_WITH_SB(s))
brelse(SB_BUFFER_WITH_SB(s));
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-30 02:02:58 +0000