@@ -180,8 +180,7 @@ struct ext4_map_blocks {
* Flags for ext4_io_end->flags
*/
#define EXT4_IO_END_UNWRITTEN 0x0001
-#define EXT4_IO_END_ERROR 0x0002
-#define EXT4_IO_END_DIRECT 0x0004
+#define EXT4_IO_END_DIRECT 0x0002
/*
* For converting uninitialized extents on a work queue. 'handle' is used for
@@ -192,6 +191,8 @@ typedef struct ext4_io_end {
handle_t *handle; /* handle reserved for extent
* conversion */
struct inode *inode; /* file being written to */
+ struct bio *bio; /* Linked list of completed
+ * bios covering the extent */
unsigned int flag; /* unwritten or not */
loff_t offset; /* offset in the file */
ssize_t size; /* size of the extent */
@@ -132,10 +132,6 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
if (inode->i_sb->s_flags & MS_RDONLY)
goto out;
- ret = ext4_flush_unwritten_io(inode);
- if (ret < 0)
- goto out;
-
if (!journal) {
ret = __sync_inode(inode, datasync);
if (!ret && !hlist_empty(&inode->i_dentry))
@@ -64,14 +64,83 @@ void ext4_ioend_shutdown(struct inode *inode)
cancel_work_sync(&EXT4_I(inode)->i_unrsv_conversion_work);
}
+/*
+ * Print an buffer I/O error compatible with the fs/buffer.c. This
+ * provides compatibility with dmesg scrapers that look for a specific
+ * buffer I/O error message. We really need a unified error reporting
+ * structure to userspace ala Digital Unix's uerf system, but it's
+ * probably not going to happen in my lifetime, due to LKML politics...
+ */
+static void buffer_io_error(struct buffer_head *bh)
+{
+ char b[BDEVNAME_SIZE];
+ printk(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n",
+ bdevname(bh->b_bdev, b),
+ (unsigned long long)bh->b_blocknr);
+}
+
+static void ext4_finish_bio(struct bio *bio)
+{
+ int i;
+ int error = !test_bit(BIO_UPTODATE, &bio->bi_flags);
+
+ for (i = 0; i < bio->bi_vcnt; i++) {
+ struct bio_vec *bvec = &bio->bi_io_vec[i];
+ struct page *page = bvec->bv_page;
+ struct buffer_head *bh, *head;
+ unsigned bio_start = bvec->bv_offset;
+ unsigned bio_end = bio_start + bvec->bv_len;
+ unsigned under_io = 0;
+ unsigned long flags;
+
+ if (!page)
+ continue;
+
+ if (error) {
+ SetPageError(page);
+ set_bit(AS_EIO, &page->mapping->flags);
+ }
+ bh = head = page_buffers(page);
+ /*
+ * We check all buffers in the page under BH_Uptodate_Lock
+ * to avoid races with other end io clearing async_write flags
+ */
+ local_irq_save(flags);
+ bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
+ do {
+ if (bh_offset(bh) < bio_start ||
+ bh_offset(bh) + bh->b_size > bio_end) {
+ if (buffer_async_write(bh))
+ under_io++;
+ continue;
+ }
+ clear_buffer_async_write(bh);
+ if (error)
+ buffer_io_error(bh);
+ } while ((bh = bh->b_this_page) != head);
+ bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
+ local_irq_restore(flags);
+ if (!under_io)
+ end_page_writeback(page);
+ }
+}
+
static void ext4_release_io_end(ext4_io_end_t *io_end)
{
+ struct bio *bio, *next_bio;
+
BUG_ON(!list_empty(&io_end->list));
BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
WARN_ON(io_end->handle);
if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count))
wake_up_all(ext4_ioend_wq(io_end->inode));
+
+ for (bio = io_end->bio; bio; bio = next_bio) {
+ next_bio = bio->bi_private;
+ ext4_finish_bio(bio);
+ bio_put(bio);
+ }
if (io_end->flag & EXT4_IO_END_DIRECT)
inode_dio_done(io_end->inode);
if (io_end->iocb)
@@ -267,79 +336,31 @@ ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end)
return io_end;
}
-/*
- * Print an buffer I/O error compatible with the fs/buffer.c. This
- * provides compatibility with dmesg scrapers that look for a specific
- * buffer I/O error message. We really need a unified error reporting
- * structure to userspace ala Digital Unix's uerf system, but it's
- * probably not going to happen in my lifetime, due to LKML politics...
- */
-static void buffer_io_error(struct buffer_head *bh)
-{
- char b[BDEVNAME_SIZE];
- printk(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n",
- bdevname(bh->b_bdev, b),
- (unsigned long long)bh->b_blocknr);
-}
-
static void ext4_end_bio(struct bio *bio, int error)
{
ext4_io_end_t *io_end = bio->bi_private;
- struct inode *inode;
- int i;
- int blocksize;
sector_t bi_sector = bio->bi_sector;
BUG_ON(!io_end);
- inode = io_end->inode;
- blocksize = 1 << inode->i_blkbits;
- bio->bi_private = NULL;
bio->bi_end_io = NULL;
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
error = 0;
- for (i = 0; i < bio->bi_vcnt; i++) {
- struct bio_vec *bvec = &bio->bi_io_vec[i];
- struct page *page = bvec->bv_page;
- struct buffer_head *bh, *head;
- unsigned bio_start = bvec->bv_offset;
- unsigned bio_end = bio_start + bvec->bv_len;
- unsigned under_io = 0;
- unsigned long flags;
- if (!page)
- continue;
-
- if (error) {
- SetPageError(page);
- set_bit(AS_EIO, &page->mapping->flags);
- }
- bh = head = page_buffers(page);
+ if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
/*
- * We check all buffers in the page under BH_Uptodate_Lock
- * to avoid races with other end io clearing async_write flags
+ * Link bio into list hanging from io_end. We have to do it
+ * atomically as bio completions can be racing against each
+ * other.
*/
- local_irq_save(flags);
- bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
- do {
- if (bh_offset(bh) < bio_start ||
- bh_offset(bh) + blocksize > bio_end) {
- if (buffer_async_write(bh))
- under_io++;
- continue;
- }
- clear_buffer_async_write(bh);
- if (error)
- buffer_io_error(bh);
- } while ((bh = bh->b_this_page) != head);
- bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
- local_irq_restore(flags);
- if (!under_io)
- end_page_writeback(page);
+ bio->bi_private = xchg(&io_end->bio, bio);
+ } else {
+ ext4_finish_bio(bio);
+ bio_put(bio);
}
- bio_put(bio);
if (error) {
- io_end->flag |= EXT4_IO_END_ERROR;
+ struct inode *inode = io_end->inode;
+
ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
"(offset %llu size %ld starting block %llu)",
inode->i_ino,
@@ -348,7 +369,6 @@ static void ext4_end_bio(struct bio *bio, int error)
(unsigned long long)
bi_sector >> (inode->i_blkbits - 9));
}
-
ext4_put_io_end_defer(io_end);
}