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Btrfs: fix enospc in hole punching
The hole punching can result in adding new leafs (and as a consequence new nodes) to the tree because when we find file extent items that span beyond the hole range we may end up not deleting them (just adjusting them, reducing their range by reducing their length or increasing their offset field) and add new file extent items representing holes. So after splitting a leaf (therefore creating a new one) to insert a new file extent item representing a hole, a new node might be added to each level of the tree in the worst case scenario (since there's a new key and every parent node was full). For example if a file has an extent item representing the range 0 to 64Mb and we punch a hole in the range 1Mb to 20Mb, the existing extent item is duplicated and one of the copies is adjusted to represent the range 0 to 1Mb, the other copy adjusted to represent the range 20Mb to 64Mb, and a new file extent item representing a hole in the range 1Mb to 20Mb is inserted. Fix this by using btrfs_calc_trans_metadata_size() instead of btrfs_calc_trunc_metadata_size(), so that enough metadata space is reserved for the worst possible case. Signed-off-by: Robbie Ko <robbieko@synology.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> [Modified changelog for clarity and correctness]
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1 changed files with 2 additions and 2 deletions
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@ -2347,7 +2347,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
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u64 tail_len;
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u64 orig_start = offset;
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u64 cur_offset;
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u64 min_size = btrfs_calc_trunc_metadata_size(root, 1);
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u64 min_size = btrfs_calc_trans_metadata_size(root, 1);
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u64 drop_end;
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int ret = 0;
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int err = 0;
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@ -2494,7 +2494,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
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ret = -ENOMEM;
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goto out_free;
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}
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rsv->size = btrfs_calc_trunc_metadata_size(root, 1);
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rsv->size = btrfs_calc_trans_metadata_size(root, 1);
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rsv->failfast = 1;
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/*
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