summaryrefslogtreecommitdiff
path: root/sound
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2023-11-24 13:39:02 +0000
committerDavid Howells <dhowells@redhat.com>2023-12-28 09:45:27 +0000
commit100ccd18bb41ea7abb4fbb419202c06079559501 (patch)
tree7782c047ddb96ef5122e22fddea8ea3444f32842 /sound
parent41d8e7673a7726cba57cb8112d81c89cfb6c3e35 (diff)
netfs: Optimise away reads above the point at which there can be no data
Track the file position above which the server is not expected to have any data (the "zero point") and preemptively assume that we can satisfy requests by filling them with zeroes locally rather than attempting to download them if they're over that line - even if we've written data back to the server. Assume that any data that was written back above that position is held in the local cache. Note that we have to split requests that straddle the line. Make use of this to optimise away some reads from the server. We need to set the zero point in the following circumstances: (1) When we see an extant remote inode and have no cache for it, we set the zero_point to i_size. (2) On local inode creation, we set zero_point to 0. (3) On local truncation down, we reduce zero_point to the new i_size if the new i_size is lower. (4) On local truncation up, we don't change zero_point. (5) On local modification, we don't change zero_point. (6) On remote invalidation, we set zero_point to the new i_size. (7) If stored data is discarded from the pagecache or culled from fscache, we must set zero_point above that if the data also got written to the server. (8) If dirty data is written back to the server, but not fscache, we must set zero_point above that. (9) If a direct I/O write is made, set zero_point above that. Assuming the above, any read from the server at or above the zero_point position will return all zeroes. The zero_point value can be stored in the cache, provided the above rules are applied to it by any code that culls part of the local cache. Signed-off-by: David Howells <dhowells@redhat.com> cc: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions