ext4: remove vestiges of nobh support
The nobh option was only supported for writeback mode, but given that all write paths actually create buffer heads it effectively was a no-op already. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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206f7ab4f4
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@ -873,7 +873,6 @@ struct ext4_inode_info {
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#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
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#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
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#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
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#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
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#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
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#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
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#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
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@ -313,17 +313,15 @@ static inline int ext4_should_writeback_data(struct inode *inode)
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* This function controls whether or not we should try to go down the
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* dioread_nolock code paths, which makes it safe to avoid taking
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* i_mutex for direct I/O reads. This only works for extent-based
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* files, and it doesn't work for nobh or if data journaling is
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* enabled, since the dioread_nolock code uses b_private to pass
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* information back to the I/O completion handler, and this conflicts
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* with the jbd's use of b_private.
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* files, and it doesn't work if data journaling is enabled, since the
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* dioread_nolock code uses b_private to pass information back to the
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* I/O completion handler, and this conflicts with the jbd's use of
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* b_private.
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*/
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static inline int ext4_should_dioread_nolock(struct inode *inode)
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{
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if (!test_opt(inode->i_sb, DIOREAD_NOLOCK))
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return 0;
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if (test_opt(inode->i_sb, NOBH))
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return 0;
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if (!S_ISREG(inode->i_mode))
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return 0;
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if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
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@ -2553,18 +2553,16 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
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/*
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* This function is used as a standard get_block_t calback function
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* when there is no desire to allocate any blocks. It is used as a
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* callback function for block_prepare_write(), nobh_writepage(), and
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* block_write_full_page(). These functions should only try to map a
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* single block at a time.
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* callback function for block_prepare_write() and block_write_full_page().
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* These functions should only try to map a single block at a time.
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*
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* Since this function doesn't do block allocations even if the caller
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* requests it by passing in create=1, it is critically important that
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* any caller checks to make sure that any buffer heads are returned
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* by this function are either all already mapped or marked for
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* delayed allocation before calling nobh_writepage() or
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* block_write_full_page(). Otherwise, b_blocknr could be left
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* unitialized, and the page write functions will be taken by
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* surprise.
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* delayed allocation before calling block_write_full_page(). Otherwise,
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* b_blocknr could be left unitialized, and the page write functions will
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* be taken by surprise.
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*/
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static int noalloc_get_block_write(struct inode *inode, sector_t iblock,
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struct buffer_head *bh_result, int create)
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@ -2749,9 +2747,7 @@ static int ext4_writepage(struct page *page,
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return __ext4_journalled_writepage(page, len);
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}
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if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))
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ret = nobh_writepage(page, noalloc_get_block_write, wbc);
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else if (page_bufs && buffer_uninit(page_bufs)) {
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if (page_bufs && buffer_uninit(page_bufs)) {
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ext4_set_bh_endio(page_bufs, inode);
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ret = block_write_full_page_endio(page, noalloc_get_block_write,
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wbc, ext4_end_io_buffer_write);
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@ -4125,17 +4121,6 @@ int ext4_block_truncate_page(handle_t *handle,
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length = blocksize - (offset & (blocksize - 1));
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iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
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/*
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* For "nobh" option, we can only work if we don't need to
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* read-in the page - otherwise we create buffers to do the IO.
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*/
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if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
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ext4_should_writeback_data(inode) && PageUptodate(page)) {
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zero_user(page, offset, length);
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set_page_dirty(page);
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goto unlock;
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}
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if (!page_has_buffers(page))
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create_empty_buffers(page, blocksize, 0);
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@ -946,8 +946,6 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
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seq_puts(seq, ",journal_async_commit");
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else if (test_opt(sb, JOURNAL_CHECKSUM))
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seq_puts(seq, ",journal_checksum");
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if (test_opt(sb, NOBH))
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seq_puts(seq, ",nobh");
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if (test_opt(sb, I_VERSION))
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seq_puts(seq, ",i_version");
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if (!test_opt(sb, DELALLOC))
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@ -1624,10 +1622,12 @@ set_qf_format:
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*n_blocks_count = option;
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break;
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case Opt_nobh:
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set_opt(sbi->s_mount_opt, NOBH);
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ext4_msg(sb, KERN_WARNING,
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"Ignoring deprecated nobh option");
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break;
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case Opt_bh:
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clear_opt(sbi->s_mount_opt, NOBH);
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ext4_msg(sb, KERN_WARNING,
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"Ignoring deprecated bh option");
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break;
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case Opt_i_version:
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set_opt(sbi->s_mount_opt, I_VERSION);
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@ -2912,18 +2912,7 @@ no_journal:
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ext4_msg(sb, KERN_ERR, "insufficient memory");
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goto failed_mount_wq;
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}
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if (test_opt(sb, NOBH)) {
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if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
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ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
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"its supported only with writeback mode");
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clear_opt(sbi->s_mount_opt, NOBH);
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}
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if (test_opt(sb, DIOREAD_NOLOCK)) {
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ext4_msg(sb, KERN_WARNING, "dioread_nolock option is "
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"not supported with nobh mode");
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goto failed_mount_wq;
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}
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}
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EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
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if (!EXT4_SB(sb)->dio_unwritten_wq) {
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printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
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