The function read_extent_from_disk() is only a wrapper to read tree
block.
And read_extent_data() is just a while loop to eliminate short read
caused by stripe boundary.
In fact, a lot of call sites of read_extent_data() are either reading
metadata (thus no possible short read) or doing extra loop by
themselves.
This patch will replace those two functions with read_data_from_disk(),
making it the only entrance for data/metadata read.
And update read_data_from_disk() to return the read bytes, so caller can
do a simple while loop.
For the few callers of read_extent_data(), open-code a small while loop
for them.
This will allow later RAID56 read repair using P/Q much easier.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Currently v1 space cache clearing will delete one cache inode just in
one transaction, and then start a new transaction to delete the next
inode.
This is far from efficient and can make the already slow v1 space cache
deleting even slower, as large fs has tons of cache inodes to delete.
This patch will speed up the process by batching up to 16 inode deletion
into one transaction.
A quick benchmark of deleting 702 v1 space cache inodes would look like
this:
Unpatched: 4.898s
Patched: 0.087s
Which is obviously a big win.
Reported-by: Joshua <joshua@mailmag.net>
Link: https://lore.kernel.org/linux-btrfs/0b4cf70fc883e28c97d893a3b2f81b11@mailmag.net/
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo
David Sterba