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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 08-25-2010, 03:47 PM
Tejun Heo
 
Default reiserfs: replace barriers with explicit flush / FUA usage

From: Christoph Hellwig <hch@infradead.org>

Switch to the WRITE_FLUSH_FUA flag for log writes and remove the EOPNOTSUPP
detection for barriers. Note that reiserfs had a fairly different code
path for barriers before as it wa the only filesystem actually making use
of them. The new code always uses the old non-barrier codepath and just
sets the WRITE_FLUSH_FUA explicitly for the journal commits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
fs/reiserfs/journal.c | 106 +++++++++---------------------------------------
1 files changed, 20 insertions(+), 86 deletions(-)

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 812e2c0..076c8b1 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -138,13 +138,6 @@ static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
return 0;
}

-static void disable_barrier(struct super_block *s)
-{
- REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
- printk("reiserfs: disabling flush barriers on %s
",
- reiserfs_bdevname(s));
-}
-
static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
*sb)
{
@@ -677,30 +670,6 @@ static void submit_ordered_buffer(struct buffer_head *bh)
submit_bh(WRITE, bh);
}

-static int submit_barrier_buffer(struct buffer_head *bh)
-{
- get_bh(bh);
- bh->b_end_io = reiserfs_end_ordered_io;
- clear_buffer_dirty(bh);
- if (!buffer_uptodate(bh))
- BUG();
- return submit_bh(WRITE_BARRIER, bh);
-}
-
-static void check_barrier_completion(struct super_block *s,
- struct buffer_head *bh)
-{
- if (buffer_eopnotsupp(bh)) {
- clear_buffer_eopnotsupp(bh);
- disable_barrier(s);
- set_buffer_uptodate(bh);
- set_buffer_dirty(bh);
- reiserfs_write_unlock(s);
- sync_dirty_buffer(bh);
- reiserfs_write_lock(s);
- }
-}
-
#define CHUNK_SIZE 32
struct buffer_chunk {
struct buffer_head *bh[CHUNK_SIZE];
@@ -1009,7 +978,6 @@ static int flush_commit_list(struct super_block *s,
struct buffer_head *tbh = NULL;
unsigned int trans_id = jl->j_trans_id;
struct reiserfs_journal *journal = SB_JOURNAL(s);
- int barrier = 0;
int retval = 0;
int write_len;

@@ -1094,24 +1062,6 @@ static int flush_commit_list(struct super_block *s,
}
atomic_dec(&journal->j_async_throttle);

- /* We're skipping the commit if there's an error */
- if (retval || reiserfs_is_journal_aborted(journal))
- barrier = 0;
-
- /* wait on everything written so far before writing the commit
- * if we are in barrier mode, send the commit down now
- */
- barrier = reiserfs_barrier_flush(s);
- if (barrier) {
- int ret;
- lock_buffer(jl->j_commit_bh);
- ret = submit_barrier_buffer(jl->j_commit_bh);
- if (ret == -EOPNOTSUPP) {
- set_buffer_uptodate(jl->j_commit_bh);
- disable_barrier(s);
- barrier = 0;
- }
- }
for (i = 0; i < (jl->j_len + 1); i++) {
bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
(jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
@@ -1143,27 +1093,22 @@ static int flush_commit_list(struct super_block *s,

BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);

- if (!barrier) {
- /* If there was a write error in the journal - we can't commit
- * this transaction - it will be invalid and, if successful,
- * will just end up propagating the write error out to
- * the file system. */
- if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
- if (buffer_dirty(jl->j_commit_bh))
- BUG();
- mark_buffer_dirty(jl->j_commit_bh) ;
- reiserfs_write_unlock(s);
- sync_dirty_buffer(jl->j_commit_bh) ;
- reiserfs_write_lock(s);
- }
- } else {
+ /* If there was a write error in the journal - we can't commit
+ * this transaction - it will be invalid and, if successful,
+ * will just end up propagating the write error out to
+ * the file system. */
+ if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
+ if (buffer_dirty(jl->j_commit_bh))
+ BUG();
+ mark_buffer_dirty(jl->j_commit_bh) ;
reiserfs_write_unlock(s);
- wait_on_buffer(jl->j_commit_bh);
+ 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);
}

- check_barrier_completion(s, jl->j_commit_bh);
-
/* If there was a write error in the journal - we can't commit this
* transaction - it will be invalid and, if successful, will just end
* up propagating the write error out to the filesystem. */
@@ -1319,26 +1264,15 @@ static int _update_journal_header_block(struct super_block *sb,
jh->j_first_unflushed_offset = cpu_to_le32(offset);
jh->j_mount_id = cpu_to_le32(journal->j_mount_id);

- if (reiserfs_barrier_flush(sb)) {
- int ret;
- lock_buffer(journal->j_header_bh);
- ret = submit_barrier_buffer(journal->j_header_bh);
- if (ret == -EOPNOTSUPP) {
- set_buffer_uptodate(journal->j_header_bh);
- disable_barrier(sb);
- goto sync;
- }
- reiserfs_write_unlock(sb);
- wait_on_buffer(journal->j_header_bh);
- reiserfs_write_lock(sb);
- check_barrier_completion(sb, journal->j_header_bh);
- } else {
- sync:
- set_buffer_dirty(journal->j_header_bh);
- reiserfs_write_unlock(sb);
+ set_buffer_dirty(journal->j_header_bh);
+ reiserfs_write_unlock(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(sb);
if (!buffer_uptodate(journal->j_header_bh)) {
reiserfs_warning(sb, "journal-837",
"IO error during journal replay");
--
1.7.1

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Old 09-03-2010, 10:29 AM
Tejun Heo
 
Default reiserfs: replace barriers with explicit flush / FUA usage

From: Christoph Hellwig <hch@infradead.org>

Switch to the WRITE_FLUSH_FUA flag for log writes and remove the EOPNOTSUPP
detection for barriers. Note that reiserfs had a fairly different code
path for barriers before as it wa the only filesystem actually making use
of them. The new code always uses the old non-barrier codepath and just
sets the WRITE_FLUSH_FUA explicitly for the journal commits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
fs/reiserfs/journal.c | 106 +++++++++---------------------------------------
1 files changed, 20 insertions(+), 86 deletions(-)

diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 812e2c0..076c8b1 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -138,13 +138,6 @@ static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
return 0;
}

-static void disable_barrier(struct super_block *s)
-{
- REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_BARRIER_FLUSH);
- printk("reiserfs: disabling flush barriers on %s
",
- reiserfs_bdevname(s));
-}
-
static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
*sb)
{
@@ -677,30 +670,6 @@ static void submit_ordered_buffer(struct buffer_head *bh)
submit_bh(WRITE, bh);
}

-static int submit_barrier_buffer(struct buffer_head *bh)
-{
- get_bh(bh);
- bh->b_end_io = reiserfs_end_ordered_io;
- clear_buffer_dirty(bh);
- if (!buffer_uptodate(bh))
- BUG();
- return submit_bh(WRITE_BARRIER, bh);
-}
-
-static void check_barrier_completion(struct super_block *s,
- struct buffer_head *bh)
-{
- if (buffer_eopnotsupp(bh)) {
- clear_buffer_eopnotsupp(bh);
- disable_barrier(s);
- set_buffer_uptodate(bh);
- set_buffer_dirty(bh);
- reiserfs_write_unlock(s);
- sync_dirty_buffer(bh);
- reiserfs_write_lock(s);
- }
-}
-
#define CHUNK_SIZE 32
struct buffer_chunk {
struct buffer_head *bh[CHUNK_SIZE];
@@ -1009,7 +978,6 @@ static int flush_commit_list(struct super_block *s,
struct buffer_head *tbh = NULL;
unsigned int trans_id = jl->j_trans_id;
struct reiserfs_journal *journal = SB_JOURNAL(s);
- int barrier = 0;
int retval = 0;
int write_len;

@@ -1094,24 +1062,6 @@ static int flush_commit_list(struct super_block *s,
}
atomic_dec(&journal->j_async_throttle);

- /* We're skipping the commit if there's an error */
- if (retval || reiserfs_is_journal_aborted(journal))
- barrier = 0;
-
- /* wait on everything written so far before writing the commit
- * if we are in barrier mode, send the commit down now
- */
- barrier = reiserfs_barrier_flush(s);
- if (barrier) {
- int ret;
- lock_buffer(jl->j_commit_bh);
- ret = submit_barrier_buffer(jl->j_commit_bh);
- if (ret == -EOPNOTSUPP) {
- set_buffer_uptodate(jl->j_commit_bh);
- disable_barrier(s);
- barrier = 0;
- }
- }
for (i = 0; i < (jl->j_len + 1); i++) {
bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
(jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
@@ -1143,27 +1093,22 @@ static int flush_commit_list(struct super_block *s,

BUG_ON(atomic_read(&(jl->j_commit_left)) != 1);

- if (!barrier) {
- /* If there was a write error in the journal - we can't commit
- * this transaction - it will be invalid and, if successful,
- * will just end up propagating the write error out to
- * the file system. */
- if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
- if (buffer_dirty(jl->j_commit_bh))
- BUG();
- mark_buffer_dirty(jl->j_commit_bh) ;
- reiserfs_write_unlock(s);
- sync_dirty_buffer(jl->j_commit_bh) ;
- reiserfs_write_lock(s);
- }
- } else {
+ /* If there was a write error in the journal - we can't commit
+ * this transaction - it will be invalid and, if successful,
+ * will just end up propagating the write error out to
+ * the file system. */
+ if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
+ if (buffer_dirty(jl->j_commit_bh))
+ BUG();
+ mark_buffer_dirty(jl->j_commit_bh) ;
reiserfs_write_unlock(s);
- wait_on_buffer(jl->j_commit_bh);
+ 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);
}

- check_barrier_completion(s, jl->j_commit_bh);
-
/* If there was a write error in the journal - we can't commit this
* transaction - it will be invalid and, if successful, will just end
* up propagating the write error out to the filesystem. */
@@ -1319,26 +1264,15 @@ static int _update_journal_header_block(struct super_block *sb,
jh->j_first_unflushed_offset = cpu_to_le32(offset);
jh->j_mount_id = cpu_to_le32(journal->j_mount_id);

- if (reiserfs_barrier_flush(sb)) {
- int ret;
- lock_buffer(journal->j_header_bh);
- ret = submit_barrier_buffer(journal->j_header_bh);
- if (ret == -EOPNOTSUPP) {
- set_buffer_uptodate(journal->j_header_bh);
- disable_barrier(sb);
- goto sync;
- }
- reiserfs_write_unlock(sb);
- wait_on_buffer(journal->j_header_bh);
- reiserfs_write_lock(sb);
- check_barrier_completion(sb, journal->j_header_bh);
- } else {
- sync:
- set_buffer_dirty(journal->j_header_bh);
- reiserfs_write_unlock(sb);
+ set_buffer_dirty(journal->j_header_bh);
+ reiserfs_write_unlock(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(sb);
if (!buffer_uptodate(journal->j_header_bh)) {
reiserfs_warning(sb, "journal-837",
"IO error during journal replay");
--
1.7.1

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