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ext4: Mark the buffer_heads as dirty and uptodate after prepare_write 

We need to make sure we mark the buffer_heads as dirty and uptodate
so that block_write_full_page write them correctly.

This fixes mmap corruptions that can occur in low memory situations.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
hifive-unleashed-5.1
Aneesh Kumar K.V 2008-11-07 09:06:45 -05:00 committed by Theodore Ts'o
parent ac51d83705
commit ed9b3e3379
1 changed files with 2 additions and 0 deletions
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2
fs/ext4/inode.c
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@ -2329,6 +2329,8 @@ static int ext4_da_writepage(struct page *page,
unlock_page(page);
return 0;
}
/* now mark the buffer_heads as dirty and uptodate */
block_commit_write(page, 0, PAGE_CACHE_SIZE);
}
if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode))