diff options
| -rw-r--r-- | fs/ext4/inode.c | 85 |
1 files changed, 73 insertions, 12 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 89c92c0..b6fa0c4 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1783,6 +1783,39 @@ static inline void __unmap_underlying_blocks(struct inode *inode, unmap_underlying_metadata(bdev, bh->b_blocknr + i); } +static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd, + sector_t logical, long blk_cnt) +{ + int nr_pages, i; + pgoff_t index, end; + struct pagevec pvec; + struct inode *inode = mpd->inode; + struct address_space *mapping = inode->i_mapping; + + index = logical >> (PAGE_CACHE_SHIFT - inode->i_blkbits); + end = (logical + blk_cnt - 1) >> + (PAGE_CACHE_SHIFT - inode->i_blkbits); + while (index <= end) { + nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); + if (nr_pages == 0) + break; + for (i = 0; i < nr_pages; i++) { + struct page *page = pvec.pages[i]; + index = page->index; + if (index > end) + break; + index++; + + BUG_ON(!PageLocked(page)); + BUG_ON(PageWriteback(page)); + block_invalidatepage(page, 0); + ClearPageUptodate(page); + unlock_page(page); + } + } + return; +} + /* * mpage_da_map_blocks - go through given space * @@ -1792,7 +1825,7 @@ static inline void __unmap_underlying_blocks(struct inode *inode, * The function skips space we know is already mapped to disk blocks. * */ -static void mpage_da_map_blocks(struct mpage_da_data *mpd) +static int mpage_da_map_blocks(struct mpage_da_data *mpd) { int err = 0; struct buffer_head *lbh = &mpd->lbh; @@ -1803,7 +1836,7 @@ static void mpage_da_map_blocks(struct mpage_da_data *mpd) * We consider only non-mapped and non-allocated blocks */ if (buffer_mapped(lbh) && !buffer_delay(lbh)) - return; + return 0; new.b_state = lbh->b_state; new.b_blocknr = 0; @@ -1814,10 +1847,38 @@ static void mpage_da_map_blocks(struct mpage_da_data *mpd) * to write simply return */ if (!new.b_size) - return; + return 0; err = mpd->get_block(mpd->inode, next, &new, 1); - if (err) - return; + if (err) { + + /* If get block returns with error + * we simply return. Later writepage + * will redirty the page and writepages + * will find the dirty page again + */ + if (err == -EAGAIN) + return 0; + /* + * get block failure will cause us + * to loop in writepages. Because + * a_ops->writepage won't be able to + * make progress. The page will be redirtied + * by writepage and writepages will again + * try to write the same. + */ + printk(KERN_EMERG "%s block allocation failed for inode %lu " + "at logical offset %llu with max blocks " + "%zd with error %d\n", + __func__, mpd->inode->i_ino, + (unsigned long long)next, + lbh->b_size >> mpd->inode->i_blkbits, err); + printk(KERN_EMERG "This should not happen.!! " + "Data will be lost\n"); + /* invlaidate all the pages */ + ext4_da_block_invalidatepages(mpd, next, + lbh->b_size >> mpd->inode->i_blkbits); + return err; + } BUG_ON(new.b_size == 0); if (buffer_new(&new)) @@ -1830,7 +1891,7 @@ static void mpage_da_map_blocks(struct mpage_da_data *mpd) if (buffer_delay(lbh) || buffer_unwritten(lbh)) mpage_put_bnr_to_bhs(mpd, next, &new); - return; + return 0; } #define BH_FLAGS ((1 << BH_Uptodate) | (1 << BH_Mapped) | \ @@ -1899,8 +1960,8 @@ flush_it: * We couldn't merge the block to our extent, so we * need to flush current extent and start new one */ - mpage_da_map_blocks(mpd); - mpage_da_submit_io(mpd); + if (mpage_da_map_blocks(mpd) == 0) + mpage_da_submit_io(mpd); mpd->io_done = 1; return; } @@ -1942,8 +2003,8 @@ static int __mpage_da_writepage(struct page *page, * and start IO on them using writepage() */ if (mpd->next_page != mpd->first_page) { - mpage_da_map_blocks(mpd); - mpage_da_submit_io(mpd); + if (mpage_da_map_blocks(mpd) == 0) + mpage_da_submit_io(mpd); /* * skip rest of the page in the page_vec */ @@ -2046,8 +2107,8 @@ static int mpage_da_writepages(struct address_space *mapping, * Handle last extent of pages */ if (!mpd.io_done && mpd.next_page != mpd.first_page) { - mpage_da_map_blocks(&mpd); - mpage_da_submit_io(&mpd); + if (mpage_da_map_blocks(&mpd) == 0) + mpage_da_submit_io(&mpd); } wbc->nr_to_write = to_write - mpd.pages_written; |