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util.datamanager: Efficiently remove whole blocks to shift lists

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Using the new pposix.remove_blocks() it should be very performant to
delete whole sections of a file, given a supporting file system.
This commit is contained in:
Kim Alvefur 2023-07-12 11:45:12 +02:00
parent 048b064fcd
commit 3346561d43
1 changed files with 40 additions and 0 deletions
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40
util/datamanager.lua
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@ -34,11 +34,13 @@ local prosody = prosody;
local raw_mkdir = lfs.mkdir;
local atomic_append;
local remove_blocks;
local ENOENT = 2;
pcall(function()
local pposix = require "prosody.util.pposix";
raw_mkdir = pposix.mkdir or raw_mkdir; -- Doesn't trample on umask
atomic_append = pposix.atomic_append;
remove_blocks = pposix.remove_blocks;
ENOENT = pposix.ENOENT or ENOENT;
end);
@ -572,6 +574,44 @@ local function list_shift(username, host, datastore, trim_to)
return true;
end
if remove_blocks then
local f, err = io_open(list_filename, "r+");
if not f then
return f, err;
end
local diff = 0;
local block_offset = 0;
if offset % 0x1000 ~= 0 then
-- Not an even block boundary, we will have to overwrite
diff = offset % 0x1000;
block_offset = offset - diff;
end
if block_offset == 0 then
log("debug", "")
else
local ok, err = remove_blocks(f, 0, block_offset);
log("debug", "remove_blocks(%s, 0, %d)", f, block_offset);
if not ok then
log("warn", "Could not remove blocks from %q[%d, %d]: %s", list_filename, 0, block_offset, err);
else
if diff ~= 0 then
-- overwrite unaligned leftovers
if f:seek("set", 0) then
local wrote, err = f:write(string.rep("\n", diff));
if not wrote then
log("error", "Could not blank out %q[%d, %d]: %s", list_filename, 0, diff, err);
end
end
end
local ok, err = f:close();
shift_index(index_filename, index, trim_to, offset); -- Shift or delete the index
return ok, err;
end
end
end
local r, err = io_open(list_filename, "r");
if not r then
return nil, err;