| buffer.c (7eaceaccab5f40bbfda044629a6298616aeaed50) | buffer.c (721a9602e6607417c6bc15b18e97a2f35266c690) |
|---|---|
| 1/* 2 * linux/fs/buffer.c 3 * 4 * Copyright (C) 1991, 1992, 2002 Linus Torvalds 5 */ 6 7/* 8 * Start bdflush() with kernel_thread not syscall - Paul Gortmaker, 12/95 --- 753 unchanged lines hidden (view full) --- 762 spin_unlock(lock); 763 /* 764 * Ensure any pending I/O completes so that 765 * write_dirty_buffer() actually writes the 766 * current contents - it is a noop if I/O is 767 * still in flight on potentially older 768 * contents. 769 */ | 1/* 2 * linux/fs/buffer.c 3 * 4 * Copyright (C) 1991, 1992, 2002 Linus Torvalds 5 */ 6 7/* 8 * Start bdflush() with kernel_thread not syscall - Paul Gortmaker, 12/95 --- 753 unchanged lines hidden (view full) --- 762 spin_unlock(lock); 763 /* 764 * Ensure any pending I/O completes so that 765 * write_dirty_buffer() actually writes the 766 * current contents - it is a noop if I/O is 767 * still in flight on potentially older 768 * contents. 769 */ |
| 770 write_dirty_buffer(bh, WRITE_SYNC_PLUG); | 770 write_dirty_buffer(bh, WRITE_SYNC); |
| 771 772 /* 773 * Kick off IO for the previous mapping. Note 774 * that we will not run the very last mapping, 775 * wait_on_buffer() will do that for us 776 * through sync_buffer(). 777 */ 778 brelse(bh); --- 818 unchanged lines hidden (view full) --- 1597 * 1598 * If block_write_full_page() is called for regular writeback 1599 * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a 1600 * locked buffer. This only can happen if someone has written the buffer 1601 * directly, with submit_bh(). At the address_space level PageWriteback 1602 * prevents this contention from occurring. 1603 * 1604 * If block_write_full_page() is called with wbc->sync_mode == | 771 772 /* 773 * Kick off IO for the previous mapping. Note 774 * that we will not run the very last mapping, 775 * wait_on_buffer() will do that for us 776 * through sync_buffer(). 777 */ 778 brelse(bh); --- 818 unchanged lines hidden (view full) --- 1597 * 1598 * If block_write_full_page() is called for regular writeback 1599 * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a 1600 * locked buffer. This only can happen if someone has written the buffer 1601 * directly, with submit_bh(). At the address_space level PageWriteback 1602 * prevents this contention from occurring. 1603 * 1604 * If block_write_full_page() is called with wbc->sync_mode == |
| 1605 * WB_SYNC_ALL, the writes are posted using WRITE_SYNC_PLUG; this 1606 * causes the writes to be flagged as synchronous writes, but the 1607 * block device queue will NOT be unplugged, since usually many pages 1608 * will be pushed to the out before the higher-level caller actually 1609 * waits for the writes to be completed. The various wait functions, 1610 * such as wait_on_writeback_range() will ultimately call sync_page() 1611 * which will ultimately call blk_run_backing_dev(), which will end up 1612 * unplugging the device queue. | 1605 * WB_SYNC_ALL, the writes are posted using WRITE_SYNC; this 1606 * causes the writes to be flagged as synchronous writes. |
| 1613 */ 1614static int __block_write_full_page(struct inode *inode, struct page *page, 1615 get_block_t *get_block, struct writeback_control *wbc, 1616 bh_end_io_t *handler) 1617{ 1618 int err; 1619 sector_t block; 1620 sector_t last_block; 1621 struct buffer_head *bh, *head; 1622 const unsigned blocksize = 1 << inode->i_blkbits; 1623 int nr_underway = 0; 1624 int write_op = (wbc->sync_mode == WB_SYNC_ALL ? | 1607 */ 1608static int __block_write_full_page(struct inode *inode, struct page *page, 1609 get_block_t *get_block, struct writeback_control *wbc, 1610 bh_end_io_t *handler) 1611{ 1612 int err; 1613 sector_t block; 1614 sector_t last_block; 1615 struct buffer_head *bh, *head; 1616 const unsigned blocksize = 1 << inode->i_blkbits; 1617 int nr_underway = 0; 1618 int write_op = (wbc->sync_mode == WB_SYNC_ALL ? |
| 1625 WRITE_SYNC_PLUG : WRITE); | 1619 WRITE_SYNC : WRITE); |
| 1626 1627 BUG_ON(!PageLocked(page)); 1628 1629 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; 1630 1631 if (!page_has_buffers(page)) { 1632 create_empty_buffers(page, blocksize, 1633 (1 << BH_Dirty)|(1 << BH_Uptodate)); --- 1662 unchanged lines hidden --- | 1620 1621 BUG_ON(!PageLocked(page)); 1622 1623 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; 1624 1625 if (!page_has_buffers(page)) { 1626 create_empty_buffers(page, blocksize, 1627 (1 << BH_Dirty)|(1 << BH_Uptodate)); --- 1662 unchanged lines hidden --- |