ext4: revert "ext4: use io_end for multiple bios"
This reverts commit 4eec708d26.
Multiple users have reported crashes which is apparently caused by
this commit. Thanks to Dmitry Monakhov for bisecting it.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Dmitry Monakhov <dmonakhov@openvz.org>
Cc: Jan Kara <jack@suse.cz>
wifi-calibration
Theodore Ts'o
parent
e6155736ad
commit
a549984b8c
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@ -209,7 +209,6 @@ typedef struct ext4_io_end {
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ssize_t size; /* size of the extent */
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struct kiocb *iocb; /* iocb struct for AIO */
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int result; /* error value for AIO */
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atomic_t count; /* reference counter */
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} ext4_io_end_t;
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struct ext4_io_submit {
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@ -2651,14 +2650,11 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
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/* page-io.c */
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extern int __init ext4_init_pageio(void);
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extern void ext4_add_complete_io(ext4_io_end_t *io_end);
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extern void ext4_exit_pageio(void);
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extern void ext4_ioend_shutdown(struct inode *);
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extern void ext4_free_io_end(ext4_io_end_t *io);
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extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
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extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
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extern int ext4_put_io_end(ext4_io_end_t *io_end);
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extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
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extern void ext4_io_submit_init(struct ext4_io_submit *io,
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struct writeback_control *wbc);
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extern void ext4_end_io_work(struct work_struct *work);
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extern void ext4_io_submit(struct ext4_io_submit *io);
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extern int ext4_bio_write_page(struct ext4_io_submit *io,
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@ -1487,10 +1487,7 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd,
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struct ext4_io_submit io_submit;
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BUG_ON(mpd->next_page <= mpd->first_page);
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ext4_io_submit_init(&io_submit, mpd->wbc);
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io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS);
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if (!io_submit.io_end)
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return -ENOMEM;
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memset(&io_submit, 0, sizeof(io_submit));
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/*
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* We need to start from the first_page to the next_page - 1
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* to make sure we also write the mapped dirty buffer_heads.
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@ -1578,8 +1575,6 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd,
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pagevec_release(&pvec);
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}
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ext4_io_submit(&io_submit);
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/* Drop io_end reference we got from init */
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ext4_put_io_end_defer(io_submit.io_end);
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return ret;
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}
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@ -2238,16 +2233,9 @@ static int ext4_writepage(struct page *page,
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*/
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return __ext4_journalled_writepage(page, len);
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ext4_io_submit_init(&io_submit, wbc);
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io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS);
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if (!io_submit.io_end) {
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redirty_page_for_writepage(wbc, page);
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return -ENOMEM;
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}
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memset(&io_submit, 0, sizeof(io_submit));
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ret = ext4_bio_write_page(&io_submit, page, len, wbc);
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ext4_io_submit(&io_submit);
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/* Drop io_end reference we got from init */
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ext4_put_io_end_defer(io_submit.io_end);
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return ret;
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}
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@ -3078,13 +3066,9 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
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struct inode *inode = file_inode(iocb->ki_filp);
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ext4_io_end_t *io_end = iocb->private;
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/* if not async direct IO just return */
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if (!io_end) {
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inode_dio_done(inode);
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if (is_async)
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aio_complete(iocb, ret, 0);
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return;
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}
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/* if not async direct IO or dio with 0 bytes write, just return */
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if (!io_end || !size)
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goto out;
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ext_debug("ext4_end_io_dio(): io_end 0x%p "
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"for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
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@ -3092,13 +3076,25 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
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size);
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iocb->private = NULL;
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/* if not aio dio with unwritten extents, just free io and return */
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if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
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ext4_free_io_end(io_end);
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out:
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inode_dio_done(inode);
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if (is_async)
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aio_complete(iocb, ret, 0);
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return;
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}
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io_end->offset = offset;
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io_end->size = size;
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if (is_async) {
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io_end->iocb = iocb;
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io_end->result = ret;
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}
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ext4_put_io_end_defer(io_end);
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ext4_add_complete_io(io_end);
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}
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/*
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@ -3132,7 +3128,6 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
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get_block_t *get_block_func = NULL;
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int dio_flags = 0;
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loff_t final_size = offset + count;
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ext4_io_end_t *io_end = NULL;
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/* Use the old path for reads and writes beyond i_size. */
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if (rw != WRITE || final_size > inode->i_size)
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@ -3171,16 +3166,13 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
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iocb->private = NULL;
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ext4_inode_aio_set(inode, NULL);
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if (!is_sync_kiocb(iocb)) {
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io_end = ext4_init_io_end(inode, GFP_NOFS);
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ext4_io_end_t *io_end = ext4_init_io_end(inode, GFP_NOFS);
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if (!io_end) {
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ret = -ENOMEM;
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goto retake_lock;
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}
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io_end->flag |= EXT4_IO_END_DIRECT;
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/*
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* Grab reference for DIO. Will be dropped in ext4_end_io_dio()
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*/
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iocb->private = ext4_get_io_end(io_end);
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iocb->private = io_end;
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/*
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* we save the io structure for current async direct
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* IO, so that later ext4_map_blocks() could flag the
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@ -3204,27 +3196,26 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
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NULL,
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dio_flags);
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/*
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* Put our reference to io_end. This can free the io_end structure e.g.
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* in sync IO case or in case of error. It can even perform extent
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* conversion if all bios we submitted finished before we got here.
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* Note that in that case iocb->private can be already set to NULL
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* here.
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*/
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if (io_end) {
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if (iocb->private)
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ext4_inode_aio_set(inode, NULL);
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ext4_put_io_end(io_end);
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/*
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* In case of error or no write ext4_end_io_dio() was not
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* called so we have to put iocb's reference.
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*/
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if (ret <= 0 && ret != -EIOCBQUEUED) {
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WARN_ON(iocb->private != io_end);
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ext4_put_io_end(io_end);
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iocb->private = NULL;
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}
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}
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if (ret > 0 && !overwrite && ext4_test_inode_state(inode,
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/*
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* The io_end structure takes a reference to the inode, that
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* structure needs to be destroyed and the reference to the
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* inode need to be dropped, when IO is complete, even with 0
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* byte write, or failed.
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*
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* In the successful AIO DIO case, the io_end structure will
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* be destroyed and the reference to the inode will be dropped
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* after the end_io call back function is called.
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*
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* In the case there is 0 byte write, or error case, since VFS
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* direct IO won't invoke the end_io call back function, we
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* need to free the end_io structure here.
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*/
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if (ret != -EIOCBQUEUED && ret <= 0 && iocb->private) {
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ext4_free_io_end(iocb->private);
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iocb->private = NULL;
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} else if (ret > 0 && !overwrite && ext4_test_inode_state(inode,
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EXT4_STATE_DIO_UNWRITTEN)) {
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int err;
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/*
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@ -61,28 +61,15 @@ void ext4_ioend_shutdown(struct inode *inode)
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cancel_work_sync(&EXT4_I(inode)->i_unwritten_work);
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}
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static void ext4_release_io_end(ext4_io_end_t *io_end)
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void ext4_free_io_end(ext4_io_end_t *io)
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{
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BUG_ON(!list_empty(&io_end->list));
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BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
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BUG_ON(!io);
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BUG_ON(!list_empty(&io->list));
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BUG_ON(io->flag & EXT4_IO_END_UNWRITTEN);
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if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count))
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wake_up_all(ext4_ioend_wq(io_end->inode));
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if (io_end->flag & EXT4_IO_END_DIRECT)
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inode_dio_done(io_end->inode);
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if (io_end->iocb)
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aio_complete(io_end->iocb, io_end->result, 0);
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kmem_cache_free(io_end_cachep, io_end);
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}
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static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
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{
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struct inode *inode = io_end->inode;
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io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
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/* Wake up anyone waiting on unwritten extent conversion */
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if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
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wake_up_all(ext4_ioend_wq(inode));
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if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count))
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wake_up_all(ext4_ioend_wq(io->inode));
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kmem_cache_free(io_end_cachep, io);
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}
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/* check a range of space and convert unwritten extents to written. */
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@ -105,8 +92,13 @@ static int ext4_end_io(ext4_io_end_t *io)
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"(inode %lu, offset %llu, size %zd, error %d)",
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inode->i_ino, offset, size, ret);
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}
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ext4_clear_io_unwritten_flag(io);
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ext4_release_io_end(io);
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/* Wake up anyone waiting on unwritten extent conversion */
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if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
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wake_up_all(ext4_ioend_wq(inode));
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if (io->flag & EXT4_IO_END_DIRECT)
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inode_dio_done(inode);
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if (io->iocb)
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aio_complete(io->iocb, io->result, 0);
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return ret;
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}
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@ -137,7 +129,7 @@ static void dump_completed_IO(struct inode *inode)
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}
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/* Add the io_end to per-inode completed end_io list. */
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static void ext4_add_complete_io(ext4_io_end_t *io_end)
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void ext4_add_complete_io(ext4_io_end_t *io_end)
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{
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struct ext4_inode_info *ei = EXT4_I(io_end->inode);
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struct workqueue_struct *wq;
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@ -174,6 +166,8 @@ static int ext4_do_flush_completed_IO(struct inode *inode)
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err = ext4_end_io(io);
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if (unlikely(!ret && err))
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ret = err;
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io->flag &= ~EXT4_IO_END_UNWRITTEN;
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ext4_free_io_end(io);
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}
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return ret;
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}
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@ -205,43 +199,10 @@ ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
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atomic_inc(&EXT4_I(inode)->i_ioend_count);
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io->inode = inode;
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INIT_LIST_HEAD(&io->list);
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atomic_set(&io->count, 1);
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}
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return io;
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}
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void ext4_put_io_end_defer(ext4_io_end_t *io_end)
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{
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if (atomic_dec_and_test(&io_end->count)) {
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if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) {
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ext4_release_io_end(io_end);
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return;
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}
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ext4_add_complete_io(io_end);
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}
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}
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int ext4_put_io_end(ext4_io_end_t *io_end)
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{
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int err = 0;
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if (atomic_dec_and_test(&io_end->count)) {
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if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
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err = ext4_convert_unwritten_extents(io_end->inode,
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io_end->offset, io_end->size);
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ext4_clear_io_unwritten_flag(io_end);
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}
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ext4_release_io_end(io_end);
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}
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return err;
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}
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ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end)
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{
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atomic_inc(&io_end->count);
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return io_end;
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}
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/*
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* Print an buffer I/O error compatible with the fs/buffer.c. This
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* provides compatibility with dmesg scrapers that look for a specific
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@ -324,7 +285,12 @@ static void ext4_end_bio(struct bio *bio, int error)
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bi_sector >> (inode->i_blkbits - 9));
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}
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ext4_put_io_end_defer(io_end);
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if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
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ext4_free_io_end(io_end);
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return;
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}
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ext4_add_complete_io(io_end);
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}
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void ext4_io_submit(struct ext4_io_submit *io)
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@ -338,37 +304,40 @@ void ext4_io_submit(struct ext4_io_submit *io)
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bio_put(io->io_bio);
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}
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io->io_bio = NULL;
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}
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void ext4_io_submit_init(struct ext4_io_submit *io,
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struct writeback_control *wbc)
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{
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io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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io->io_bio = NULL;
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io->io_op = 0;
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io->io_end = NULL;
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}
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static int io_submit_init_bio(struct ext4_io_submit *io,
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struct buffer_head *bh)
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static int io_submit_init(struct ext4_io_submit *io,
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struct inode *inode,
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struct writeback_control *wbc,
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struct buffer_head *bh)
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{
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ext4_io_end_t *io_end;
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struct page *page = bh->b_page;
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int nvecs = bio_get_nr_vecs(bh->b_bdev);
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struct bio *bio;
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io_end = ext4_init_io_end(inode, GFP_NOFS);
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if (!io_end)
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return -ENOMEM;
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bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES));
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bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
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bio->bi_bdev = bh->b_bdev;
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bio->bi_private = io->io_end = io_end;
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bio->bi_end_io = ext4_end_bio;
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bio->bi_private = ext4_get_io_end(io->io_end);
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if (!io->io_end->size)
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io->io_end->offset = (bh->b_page->index << PAGE_CACHE_SHIFT)
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+ bh_offset(bh);
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io_end->offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(bh);
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io->io_bio = bio;
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io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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io->io_next_block = bh->b_blocknr;
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return 0;
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}
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static int io_submit_add_bh(struct ext4_io_submit *io,
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struct inode *inode,
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struct writeback_control *wbc,
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struct buffer_head *bh)
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{
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ext4_io_end_t *io_end;
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@ -379,18 +348,18 @@ submit_and_retry:
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ext4_io_submit(io);
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}
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if (io->io_bio == NULL) {
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ret = io_submit_init_bio(io, bh);
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ret = io_submit_init(io, inode, wbc, bh);
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if (ret)
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return ret;
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}
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ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh));
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if (ret != bh->b_size)
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goto submit_and_retry;
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io_end = io->io_end;
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if (test_clear_buffer_uninit(bh))
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ext4_set_io_unwritten_flag(inode, io_end);
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io_end->size += bh->b_size;
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io->io_end->size += bh->b_size;
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io->io_next_block++;
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ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh));
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if (ret != bh->b_size)
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goto submit_and_retry;
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return 0;
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}
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@ -462,7 +431,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
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do {
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if (!buffer_async_write(bh))
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||||
continue;
|
||||
ret = io_submit_add_bh(io, inode, bh);
|
||||
ret = io_submit_add_bh(io, inode, wbc, bh);
|
||||
if (ret) {
|
||||
/*
|
||||
* We only get here on ENOMEM. Not much else
|
||||
|
|
|
|||
Loading…
Reference in New Issue