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Diffstat (limited to 'ANDROID_3.4.5/fs/ext4/page-io.c')
-rw-r--r--ANDROID_3.4.5/fs/ext4/page-io.c433
1 files changed, 0 insertions, 433 deletions
diff --git a/ANDROID_3.4.5/fs/ext4/page-io.c b/ANDROID_3.4.5/fs/ext4/page-io.c
deleted file mode 100644
index dcdeef16..00000000
--- a/ANDROID_3.4.5/fs/ext4/page-io.c
+++ /dev/null
@@ -1,433 +0,0 @@
-/*
- * linux/fs/ext4/page-io.c
- *
- * This contains the new page_io functions for ext4
- *
- * Written by Theodore Ts'o, 2010.
- */
-
-#include <linux/fs.h>
-#include <linux/time.h>
-#include <linux/jbd2.h>
-#include <linux/highuid.h>
-#include <linux/pagemap.h>
-#include <linux/quotaops.h>
-#include <linux/string.h>
-#include <linux/buffer_head.h>
-#include <linux/writeback.h>
-#include <linux/pagevec.h>
-#include <linux/mpage.h>
-#include <linux/namei.h>
-#include <linux/uio.h>
-#include <linux/bio.h>
-#include <linux/workqueue.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-
-#include "ext4_jbd2.h"
-#include "xattr.h"
-#include "acl.h"
-#include "ext4_extents.h"
-
-static struct kmem_cache *io_page_cachep, *io_end_cachep;
-
-int __init ext4_init_pageio(void)
-{
- io_page_cachep = KMEM_CACHE(ext4_io_page, SLAB_RECLAIM_ACCOUNT);
- if (io_page_cachep == NULL)
- return -ENOMEM;
- io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT);
- if (io_end_cachep == NULL) {
- kmem_cache_destroy(io_page_cachep);
- return -ENOMEM;
- }
- return 0;
-}
-
-void ext4_exit_pageio(void)
-{
- kmem_cache_destroy(io_end_cachep);
- kmem_cache_destroy(io_page_cachep);
-}
-
-void ext4_ioend_wait(struct inode *inode)
-{
- wait_queue_head_t *wq = ext4_ioend_wq(inode);
-
- wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0));
-}
-
-static void put_io_page(struct ext4_io_page *io_page)
-{
- if (atomic_dec_and_test(&io_page->p_count)) {
- end_page_writeback(io_page->p_page);
- put_page(io_page->p_page);
- kmem_cache_free(io_page_cachep, io_page);
- }
-}
-
-void ext4_free_io_end(ext4_io_end_t *io)
-{
- int i;
-
- BUG_ON(!io);
- if (io->page)
- put_page(io->page);
- for (i = 0; i < io->num_io_pages; i++)
- put_io_page(io->pages[i]);
- io->num_io_pages = 0;
- if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count))
- wake_up_all(ext4_ioend_wq(io->inode));
- kmem_cache_free(io_end_cachep, io);
-}
-
-/*
- * check a range of space and convert unwritten extents to written.
- *
- * Called with inode->i_mutex; we depend on this when we manipulate
- * io->flag, since we could otherwise race with ext4_flush_completed_IO()
- */
-int ext4_end_io_nolock(ext4_io_end_t *io)
-{
- struct inode *inode = io->inode;
- loff_t offset = io->offset;
- ssize_t size = io->size;
- int ret = 0;
-
- ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p,"
- "list->prev 0x%p\n",
- io, inode->i_ino, io->list.next, io->list.prev);
-
- ret = ext4_convert_unwritten_extents(inode, offset, size);
- if (ret < 0) {
- ext4_msg(inode->i_sb, KERN_EMERG,
- "failed to convert unwritten extents to written "
- "extents -- potential data loss! "
- "(inode %lu, offset %llu, size %zd, error %d)",
- inode->i_ino, offset, size, ret);
- }
-
- if (io->iocb)
- aio_complete(io->iocb, io->result, 0);
-
- if (io->flag & EXT4_IO_END_DIRECT)
- inode_dio_done(inode);
- /* Wake up anyone waiting on unwritten extent conversion */
- if (atomic_dec_and_test(&EXT4_I(inode)->i_aiodio_unwritten))
- wake_up_all(ext4_ioend_wq(io->inode));
- return ret;
-}
-
-/*
- * work on completed aio dio IO, to convert unwritten extents to extents
- */
-static void ext4_end_io_work(struct work_struct *work)
-{
- ext4_io_end_t *io = container_of(work, ext4_io_end_t, work);
- struct inode *inode = io->inode;
- struct ext4_inode_info *ei = EXT4_I(inode);
- unsigned long flags;
-
- spin_lock_irqsave(&ei->i_completed_io_lock, flags);
- if (io->flag & EXT4_IO_END_IN_FSYNC)
- goto requeue;
- if (list_empty(&io->list)) {
- spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
- goto free;
- }
-
- if (!mutex_trylock(&inode->i_mutex)) {
- bool was_queued;
-requeue:
- was_queued = !!(io->flag & EXT4_IO_END_QUEUED);
- io->flag |= EXT4_IO_END_QUEUED;
- spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
- /*
- * Requeue the work instead of waiting so that the work
- * items queued after this can be processed.
- */
- queue_work(EXT4_SB(inode->i_sb)->dio_unwritten_wq, &io->work);
- /*
- * To prevent the ext4-dio-unwritten thread from keeping
- * requeueing end_io requests and occupying cpu for too long,
- * yield the cpu if it sees an end_io request that has already
- * been requeued.
- */
- if (was_queued)
- yield();
- return;
- }
- list_del_init(&io->list);
- spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
- (void) ext4_end_io_nolock(io);
- mutex_unlock(&inode->i_mutex);
-free:
- ext4_free_io_end(io);
-}
-
-ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
-{
- ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags);
- if (io) {
- atomic_inc(&EXT4_I(inode)->i_ioend_count);
- io->inode = inode;
- INIT_WORK(&io->work, ext4_end_io_work);
- INIT_LIST_HEAD(&io->list);
- }
- return io;
-}
-
-/*
- * 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 workqueue_struct *wq;
- struct inode *inode;
- unsigned long flags;
- int i;
- sector_t bi_sector = bio->bi_sector;
-
- BUG_ON(!io_end);
- bio->bi_private = NULL;
- bio->bi_end_io = NULL;
- if (test_bit(BIO_UPTODATE, &bio->bi_flags))
- error = 0;
- bio_put(bio);
-
- for (i = 0; i < io_end->num_io_pages; i++) {
- struct page *page = io_end->pages[i]->p_page;
- struct buffer_head *bh, *head;
- loff_t offset;
- loff_t io_end_offset;
-
- if (error) {
- SetPageError(page);
- set_bit(AS_EIO, &page->mapping->flags);
- head = page_buffers(page);
- BUG_ON(!head);
-
- io_end_offset = io_end->offset + io_end->size;
-
- offset = (sector_t) page->index << PAGE_CACHE_SHIFT;
- bh = head;
- do {
- if ((offset >= io_end->offset) &&
- (offset+bh->b_size <= io_end_offset))
- buffer_io_error(bh);
-
- offset += bh->b_size;
- bh = bh->b_this_page;
- } while (bh != head);
- }
-
- put_io_page(io_end->pages[i]);
- }
- io_end->num_io_pages = 0;
- inode = io_end->inode;
-
- if (error) {
- io_end->flag |= EXT4_IO_END_ERROR;
- ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
- "(offset %llu size %ld starting block %llu)",
- inode->i_ino,
- (unsigned long long) io_end->offset,
- (long) io_end->size,
- (unsigned long long)
- bi_sector >> (inode->i_blkbits - 9));
- }
-
- if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
- ext4_free_io_end(io_end);
- return;
- }
-
- /* Add the io_end to per-inode completed io list*/
- spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags);
- list_add_tail(&io_end->list, &EXT4_I(inode)->i_completed_io_list);
- spin_unlock_irqrestore(&EXT4_I(inode)->i_completed_io_lock, flags);
-
- wq = EXT4_SB(inode->i_sb)->dio_unwritten_wq;
- /* queue the work to convert unwritten extents to written */
- queue_work(wq, &io_end->work);
-}
-
-void ext4_io_submit(struct ext4_io_submit *io)
-{
- struct bio *bio = io->io_bio;
-
- if (bio) {
- bio_get(io->io_bio);
- submit_bio(io->io_op, io->io_bio);
- BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP));
- bio_put(io->io_bio);
- }
- io->io_bio = NULL;
- io->io_op = 0;
- io->io_end = NULL;
-}
-
-static int io_submit_init(struct ext4_io_submit *io,
- struct inode *inode,
- struct writeback_control *wbc,
- struct buffer_head *bh)
-{
- ext4_io_end_t *io_end;
- struct page *page = bh->b_page;
- int nvecs = bio_get_nr_vecs(bh->b_bdev);
- struct bio *bio;
-
- io_end = ext4_init_io_end(inode, GFP_NOFS);
- if (!io_end)
- return -ENOMEM;
- bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES));
- bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
- bio->bi_bdev = bh->b_bdev;
- bio->bi_private = io->io_end = io_end;
- bio->bi_end_io = ext4_end_bio;
-
- io_end->offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(bh);
-
- io->io_bio = bio;
- io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
- io->io_next_block = bh->b_blocknr;
- return 0;
-}
-
-static int io_submit_add_bh(struct ext4_io_submit *io,
- struct ext4_io_page *io_page,
- struct inode *inode,
- struct writeback_control *wbc,
- struct buffer_head *bh)
-{
- ext4_io_end_t *io_end;
- int ret;
-
- if (buffer_new(bh)) {
- clear_buffer_new(bh);
- unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
- }
-
- if (!buffer_mapped(bh) || buffer_delay(bh)) {
- if (!buffer_mapped(bh))
- clear_buffer_dirty(bh);
- if (io->io_bio)
- ext4_io_submit(io);
- return 0;
- }
-
- if (io->io_bio && bh->b_blocknr != io->io_next_block) {
-submit_and_retry:
- ext4_io_submit(io);
- }
- if (io->io_bio == NULL) {
- ret = io_submit_init(io, inode, wbc, bh);
- if (ret)
- return ret;
- }
- io_end = io->io_end;
- if ((io_end->num_io_pages >= MAX_IO_PAGES) &&
- (io_end->pages[io_end->num_io_pages-1] != io_page))
- goto submit_and_retry;
- if (buffer_uninit(bh))
- ext4_set_io_unwritten_flag(inode, io_end);
- io->io_end->size += bh->b_size;
- io->io_next_block++;
- ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh));
- if (ret != bh->b_size)
- goto submit_and_retry;
- if ((io_end->num_io_pages == 0) ||
- (io_end->pages[io_end->num_io_pages-1] != io_page)) {
- io_end->pages[io_end->num_io_pages++] = io_page;
- atomic_inc(&io_page->p_count);
- }
- return 0;
-}
-
-int ext4_bio_write_page(struct ext4_io_submit *io,
- struct page *page,
- int len,
- struct writeback_control *wbc)
-{
- struct inode *inode = page->mapping->host;
- unsigned block_start, block_end, blocksize;
- struct ext4_io_page *io_page;
- struct buffer_head *bh, *head;
- int ret = 0;
-
- blocksize = 1 << inode->i_blkbits;
-
- BUG_ON(!PageLocked(page));
- BUG_ON(PageWriteback(page));
-
- io_page = kmem_cache_alloc(io_page_cachep, GFP_NOFS);
- if (!io_page) {
- set_page_dirty(page);
- unlock_page(page);
- return -ENOMEM;
- }
- io_page->p_page = page;
- atomic_set(&io_page->p_count, 1);
- get_page(page);
- set_page_writeback(page);
- ClearPageError(page);
-
- for (bh = head = page_buffers(page), block_start = 0;
- bh != head || !block_start;
- block_start = block_end, bh = bh->b_this_page) {
-
- block_end = block_start + blocksize;
- if (block_start >= len) {
- /*
- * Comments copied from block_write_full_page_endio:
- *
- * The page straddles i_size. It must be zeroed out on
- * each and every writepage invocation because it may
- * be mmapped. "A file is mapped in multiples of the
- * page size. For a file that is not a multiple of
- * the page size, the remaining memory is zeroed when
- * mapped, and writes to that region are not written
- * out to the file."
- */
- zero_user_segment(page, block_start, block_end);
- clear_buffer_dirty(bh);
- set_buffer_uptodate(bh);
- continue;
- }
- clear_buffer_dirty(bh);
- ret = io_submit_add_bh(io, io_page, inode, wbc, bh);
- if (ret) {
- /*
- * We only get here on ENOMEM. Not much else
- * we can do but mark the page as dirty, and
- * better luck next time.
- */
- set_page_dirty(page);
- break;
- }
- }
- unlock_page(page);
- /*
- * If the page was truncated before we could do the writeback,
- * or we had a memory allocation error while trying to write
- * the first buffer head, we won't have submitted any pages for
- * I/O. In that case we need to make sure we've cleared the
- * PageWriteback bit from the page to prevent the system from
- * wedging later on.
- */
- put_io_page(io_page);
- return ret;
-}
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