kill BH_Ordered flag
Instead of abusing a buffer_head flag just add a variant of
sync_dirty_buffer which allows passing the exact type of write
flag required.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/buffer.c b/fs/buffer.c
index 50efa33..6c8ad97 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2912,13 +2912,6 @@
BUG_ON(buffer_unwritten(bh));
/*
- * Mask in barrier bit for a write (could be either a WRITE or a
- * WRITE_SYNC
- */
- if (buffer_ordered(bh) && (rw & WRITE))
- rw |= WRITE_BARRIER;
-
- /*
* Only clear out a write error when rewriting
*/
if (test_set_buffer_req(bh) && (rw & WRITE))
@@ -3021,7 +3014,7 @@
* and then start new I/O and then wait upon it. The caller must have a ref on
* the buffer_head.
*/
-int sync_dirty_buffer(struct buffer_head *bh)
+int __sync_dirty_buffer(struct buffer_head *bh, int rw)
{
int ret = 0;
@@ -3030,7 +3023,7 @@
if (test_clear_buffer_dirty(bh)) {
get_bh(bh);
bh->b_end_io = end_buffer_write_sync;
- ret = submit_bh(WRITE_SYNC, bh);
+ ret = submit_bh(rw, bh);
wait_on_buffer(bh);
if (buffer_eopnotsupp(bh)) {
clear_buffer_eopnotsupp(bh);
@@ -3043,6 +3036,12 @@
}
return ret;
}
+EXPORT_SYMBOL(__sync_dirty_buffer);
+
+int sync_dirty_buffer(struct buffer_head *bh)
+{
+ return __sync_dirty_buffer(bh, WRITE_SYNC);
+}
EXPORT_SYMBOL(sync_dirty_buffer);
/*
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index 28a9dda..95d8c11 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -119,7 +119,6 @@
struct buffer_head *bh;
journal_header_t *header;
int ret;
- int barrier_done = 0;
if (is_journal_aborted(journal))
return 0;
@@ -137,34 +136,36 @@
JBUFFER_TRACE(descriptor, "write commit block");
set_buffer_dirty(bh);
+
if (journal->j_flags & JFS_BARRIER) {
- set_buffer_ordered(bh);
- barrier_done = 1;
- }
- ret = sync_dirty_buffer(bh);
- if (barrier_done)
- clear_buffer_ordered(bh);
- /* is it possible for another commit to fail at roughly
- * the same time as this one? If so, we don't want to
- * trust the barrier flag in the super, but instead want
- * to remember if we sent a barrier request
- */
- if (ret == -EOPNOTSUPP && barrier_done) {
- char b[BDEVNAME_SIZE];
+ ret = __sync_dirty_buffer(bh, WRITE_SYNC | WRITE_BARRIER);
- printk(KERN_WARNING
- "JBD: barrier-based sync failed on %s - "
- "disabling barriers\n",
- bdevname(journal->j_dev, b));
- spin_lock(&journal->j_state_lock);
- journal->j_flags &= ~JFS_BARRIER;
- spin_unlock(&journal->j_state_lock);
+ /*
+ * Is it possible for another commit to fail at roughly
+ * the same time as this one? If so, we don't want to
+ * trust the barrier flag in the super, but instead want
+ * to remember if we sent a barrier request
+ */
+ if (ret == -EOPNOTSUPP) {
+ char b[BDEVNAME_SIZE];
- /* And try again, without the barrier */
- set_buffer_uptodate(bh);
- set_buffer_dirty(bh);
+ printk(KERN_WARNING
+ "JBD: barrier-based sync failed on %s - "
+ "disabling barriers\n",
+ bdevname(journal->j_dev, b));
+ spin_lock(&journal->j_state_lock);
+ journal->j_flags &= ~JFS_BARRIER;
+ spin_unlock(&journal->j_state_lock);
+
+ /* And try again, without the barrier */
+ set_buffer_uptodate(bh);
+ set_buffer_dirty(bh);
+ ret = sync_dirty_buffer(bh);
+ }
+ } else {
ret = sync_dirty_buffer(bh);
}
+
put_bh(bh); /* One for getblk() */
journal_put_journal_head(descriptor);
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index f52e5e8..7c068c1 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -101,7 +101,6 @@
struct commit_header *tmp;
struct buffer_head *bh;
int ret;
- int barrier_done = 0;
struct timespec now = current_kernel_time();
if (is_journal_aborted(journal))
@@ -136,30 +135,22 @@
if (journal->j_flags & JBD2_BARRIER &&
!JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
- set_buffer_ordered(bh);
- barrier_done = 1;
- }
- ret = submit_bh(WRITE_SYNC_PLUG, bh);
- if (barrier_done)
- clear_buffer_ordered(bh);
+ ret = submit_bh(WRITE_SYNC_PLUG | WRITE_BARRIER, bh);
+ if (ret == -EOPNOTSUPP) {
+ printk(KERN_WARNING
+ "JBD2: Disabling barriers on %s, "
+ "not supported by device\n", journal->j_devname);
+ write_lock(&journal->j_state_lock);
+ journal->j_flags &= ~JBD2_BARRIER;
+ write_unlock(&journal->j_state_lock);
- /* is it possible for another commit to fail at roughly
- * the same time as this one? If so, we don't want to
- * trust the barrier flag in the super, but instead want
- * to remember if we sent a barrier request
- */
- if (ret == -EOPNOTSUPP && barrier_done) {
- printk(KERN_WARNING
- "JBD2: Disabling barriers on %s, "
- "not supported by device\n", journal->j_devname);
- write_lock(&journal->j_state_lock);
- journal->j_flags &= ~JBD2_BARRIER;
- write_unlock(&journal->j_state_lock);
-
- /* And try again, without the barrier */
- lock_buffer(bh);
- set_buffer_uptodate(bh);
- clear_buffer_dirty(bh);
+ /* And try again, without the barrier */
+ lock_buffer(bh);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+ ret = submit_bh(WRITE_SYNC_PLUG, bh);
+ }
+ } else {
ret = submit_bh(WRITE_SYNC_PLUG, bh);
}
*cbh = bh;
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 1fa86b9..6834543 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -175,24 +175,24 @@
{
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
- int barrier_done = 0;
- if (nilfs_test_opt(sbi, BARRIER)) {
- set_buffer_ordered(nilfs->ns_sbh[0]);
- barrier_done = 1;
- }
retry:
set_buffer_dirty(nilfs->ns_sbh[0]);
- err = sync_dirty_buffer(nilfs->ns_sbh[0]);
- if (err == -EOPNOTSUPP && barrier_done) {
- nilfs_warning(sbi->s_super, __func__,
- "barrier-based sync failed. "
- "disabling barriers\n");
- nilfs_clear_opt(sbi, BARRIER);
- barrier_done = 0;
- clear_buffer_ordered(nilfs->ns_sbh[0]);
- goto retry;
+
+ if (nilfs_test_opt(sbi, BARRIER)) {
+ err = __sync_dirty_buffer(nilfs->ns_sbh[0],
+ WRITE_SYNC | WRITE_BARRIER);
+ if (err == -EOPNOTSUPP) {
+ nilfs_warning(sbi->s_super, __func__,
+ "barrier-based sync failed. "
+ "disabling barriers\n");
+ nilfs_clear_opt(sbi, BARRIER);
+ goto retry;
+ }
+ } else {
+ err = sync_dirty_buffer(nilfs->ns_sbh[0]);
}
+
if (unlikely(err)) {
printk(KERN_ERR
"NILFS: unable to write superblock (err=%d)\n", err);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 43e649a..72c1cf8 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -32,7 +32,6 @@
BH_Delay, /* Buffer is not yet allocated on disk */
BH_Boundary, /* Block is followed by a discontiguity */
BH_Write_EIO, /* I/O error on write */
- BH_Ordered, /* ordered write */
BH_Eopnotsupp, /* operation not supported (barrier) */
BH_Unwritten, /* Buffer is allocated on disk but not written */
BH_Quiet, /* Buffer Error Prinks to be quiet */
@@ -125,7 +124,6 @@
BUFFER_FNS(Delay, delay)
BUFFER_FNS(Boundary, boundary)
BUFFER_FNS(Write_EIO, write_io_error)
-BUFFER_FNS(Ordered, ordered)
BUFFER_FNS(Eopnotsupp, eopnotsupp)
BUFFER_FNS(Unwritten, unwritten)
@@ -183,6 +181,7 @@
void __lock_buffer(struct buffer_head *bh);
void ll_rw_block(int, int, struct buffer_head * bh[]);
int sync_dirty_buffer(struct buffer_head *bh);
+int __sync_dirty_buffer(struct buffer_head *bh, int rw);
int submit_bh(int, struct buffer_head *);
void write_boundary_block(struct block_device *bdev,
sector_t bblock, unsigned blocksize);
