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Btrfs: fix off-by-one error of the reserved size of btrfs_allocate()
alloc_end is not the real end of the current extent, it is the start of the next adjoining extent. So we needn't +1 when calculating the size the space that is about to be reserved. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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1 changed files with 2 additions and 2 deletions
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@ -2072,7 +2072,7 @@ static long btrfs_fallocate(struct file *file, int mode,
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* Make sure we have enough space before we do the
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* allocation.
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*/
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ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start + 1);
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ret = btrfs_check_data_free_space(inode, alloc_end - alloc_start);
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if (ret)
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return ret;
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@ -2179,7 +2179,7 @@ static long btrfs_fallocate(struct file *file, int mode,
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out:
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mutex_unlock(&inode->i_mutex);
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/* Let go of our reservation. */
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btrfs_free_reserved_data_space(inode, alloc_end - alloc_start + 1);
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btrfs_free_reserved_data_space(inode, alloc_end - alloc_start);
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return ret;
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}
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