This option doesn't do anything interesting for ext4 anymore since we attach
buffers to the page in page_mkwrite and in write_begin to support delayed
allocation and properly handle ENOSPC caused by mmaped writes.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/ext4/inode.c | 42 ++++++++++++------------------------------
fs/ext4/super.c | 10 +++-------
2 files changed, 15 insertions(+), 37 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f9c642b..58492ab 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2481,20 +2481,17 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
}
/*
- * This function is used as a standard get_block_t calback function
- * when there is no desire to allocate any blocks. It is used as a
- * callback function for block_prepare_write(), nobh_writepage(), and
- * block_write_full_page(). These functions should only try to map a
- * single block at a time.
+ * This function is used as a standard get_block_t calback function when there
+ * is no desire to allocate any blocks. It is used as a callback function for
+ * block_prepare_write() and block_write_full_page(). These functions should
+ * only try to map a single block at a time.
*
- * Since this function doesn't do block allocations even if the caller
- * requests it by passing in create=1, it is critically important that
- * any caller checks to make sure that any buffer heads are returned
- * by this function are either all already mapped or marked for
- * delayed allocation before calling nobh_writepage() or
- * block_write_full_page(). Otherwise, b_blocknr could be left
- * unitialized, and the page write functions will be taken by
- * surprise.
+ * Since this function doesn't do block allocations even if the caller requests
+ * it by passing in create=1, it is critically important that any caller checks
+ * to make sure that any buffer heads are returned by this function are either
+ * all already mapped or marked for delayed allocation before calling
+ * block_write_full_page(). Otherwise, b_blocknr could be left unitialized,
+ * and the page write functions will be taken by surprise.
*/
static int noalloc_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
@@ -2690,11 +2687,7 @@ static int ext4_writepage(struct page *page,
return __ext4_journalled_writepage(page, wbc, len);
}
- if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
- ret = nobh_writepage(page, noalloc_get_block_write, wbc);
- else
- ret = block_write_full_page(page, noalloc_get_block_write,
- wbc);
+ ret = block_write_full_page(page, noalloc_get_block_write, wbc);
return ret;
}
@@ -3463,17 +3456,6 @@ int ext4_block_truncate_page(handle_t *handle,
length = blocksize - (offset & (blocksize - 1));
iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
- /*
- * For "nobh" option, we can only work if we don't need to
- * read-in the page - otherwise we create buffers to do the IO.
- */
- if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
- ext4_should_writeback_data(inode) && PageUptodate(page)) {
- zero_user(page, offset, length);
- set_page_dirty(page);
- goto unlock;
- }
-
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8f4f079..160051f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -846,8 +846,6 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
seq_puts(seq, ",journal_async_commit");
- if (test_opt(sb, NOBH))
- seq_puts(seq, ",nobh");
if (test_opt(sb, I_VERSION))
seq_puts(seq, ",i_version");
if (!test_opt(sb, DELALLOC))
@@ -2775,11 +2773,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
no_journal:
if (test_opt(sb, NOBH)) {
- if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
- ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
- "its supported only with writeback mode");
- clear_opt(sbi->s_mount_opt, NOBH);
- }
+ ext4_msg(sb, KERN_WARNING, "nobh option is deprecated. "
+ "Ignoring it.");
+ clear_opt(sbi->s_mount_opt, NOBH);
}
/*
* The jbd2_journal_load will have done any necessary log recovery,
--
1.6.0.2
--
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