Btrfs: faster/more efficient insertion of file extent items
This is an extension to my previous commit titled: "Btrfs: faster file extent item replace operations" (hash 1acae57b ) Instead of inserting the new file extent item if we deleted existing file extent items covering our target file range, also allow to insert the new file extent item if we didn't find any existing items to delete and replace_extent != 0, since in this case our caller would do another tree search to insert the new file extent item anyway, therefore just combine the two tree searches into a single one, saving cpu time, reducing lock contention and reducing btree node/leaf COW operations. This covers the case where applications keep doing tail append writes to files, which for example is the case of Apache CouchDB (its database and view index files are always open with O_APPEND). Signed-off-by:Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by:
Josef Bacik <jbacik@fb.com>
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