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Btrfs: hold a ref on the inode during writepages
We can race with unlink and not actually be able to do our igrab in btrfs_add_ordered_extent. This will result in all sorts of problems. Instead of doing the complicated work to try and handle returning an error properly from btrfs_add_ordered_extent, just hold a ref to the inode during writepages. If we cannot grab a ref we know we're freeing this inode anyway and can just drop the dirty pages on the floor, because screw them we're going to invalidate them anyway. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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1 changed files with 14 additions and 0 deletions
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@ -3324,6 +3324,7 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
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writepage_t writepage, void *data,
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void (*flush_fn)(void *))
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{
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struct inode *inode = mapping->host;
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int ret = 0;
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int done = 0;
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int nr_to_write_done = 0;
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@ -3334,6 +3335,18 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
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int scanned = 0;
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int tag;
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/*
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* We have to hold onto the inode so that ordered extents can do their
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* work when the IO finishes. The alternative to this is failing to add
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* an ordered extent if the igrab() fails there and that is a huge pain
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* to deal with, so instead just hold onto the inode throughout the
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* writepages operation. If it fails here we are freeing up the inode
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* anyway and we'd rather not waste our time writing out stuff that is
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* going to be truncated anyway.
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*/
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if (!igrab(inode))
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return 0;
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pagevec_init(&pvec, 0);
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if (wbc->range_cyclic) {
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index = mapping->writeback_index; /* Start from prev offset */
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@ -3428,6 +3441,7 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
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index = 0;
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goto retry;
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}
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btrfs_add_delayed_iput(inode);
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return ret;
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}
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