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btrfs: send: avoid unnecessary generation search at did_overwrite_ref()
At did_overwrite_ref() we always call get_inode_gen() to find out the generation of the inode 'ow_inode'. However we don't always need to use that generation, and in fact it's very common to not use it, so we end up doing a b+tree search on the send root, allocating a path, etc, for nothing. So improve on this by getting the generation only if we need to use it. This patch is part of a larger patchset and the changelog of the last patch in the series contains a sample performance test and results. The patches that comprise the patchset are the following: btrfs: send: directly return from did_overwrite_ref() and simplify it btrfs: send: avoid unnecessary generation search at did_overwrite_ref() btrfs: send: directly return from will_overwrite_ref() and simplify it btrfs: send: avoid extra b+tree searches when checking reference overrides btrfs: send: remove send_progress argument from can_rmdir() btrfs: send: avoid duplicated orphan dir allocation and initialization btrfs: send: avoid unnecessary orphan dir rbtree search at can_rmdir() btrfs: send: reduce searches on parent root when checking if dir can be removed btrfs: send: iterate waiting dir move rbtree only once when processing refs btrfs: send: initialize all the red black trees earlier btrfs: send: genericize the backref cache to allow it to be reused btrfs: adapt lru cache to allow for 64 bits keys on 32 bits systems btrfs: send: cache information about created directories btrfs: allow a generation number to be associated with lru cache entries btrfs: add an api to delete a specific entry from the lru cache btrfs: send: use the lru cache to implement the name cache btrfs: send: update size of roots array for backref cache entries btrfs: send: cache utimes operations for directories if possible Signed-off-by: Filipe Manana <fdmanana@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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parent
e739ba307f
commit
cb68948194
1 changed files with 22 additions and 9 deletions
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@ -2193,8 +2193,8 @@ static int did_overwrite_ref(struct send_ctx *sctx,
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const char *name, int name_len)
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{
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int ret;
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u64 gen;
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u64 ow_inode;
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u64 ow_gen = 0;
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if (!sctx->parent_root)
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return 0;
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@ -2204,6 +2204,8 @@ static int did_overwrite_ref(struct send_ctx *sctx,
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return ret;
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if (dir != BTRFS_FIRST_FREE_OBJECTID) {
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u64 gen;
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ret = get_inode_gen(sctx->send_root, dir, &gen);
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if (ret == -ENOENT)
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return 0;
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@ -2224,12 +2226,15 @@ static int did_overwrite_ref(struct send_ctx *sctx,
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return ret;
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}
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ret = get_inode_gen(sctx->send_root, ow_inode, &gen);
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if (ow_inode == ino) {
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ret = get_inode_gen(sctx->send_root, ow_inode, &ow_gen);
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if (ret < 0)
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return ret;
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if (ow_inode == ino && gen == ino_gen)
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/* It's the same inode, so no overwrite happened. */
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if (ow_gen == ino_gen)
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return 0;
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}
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/*
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* We know that it is or will be overwritten. Check this now.
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@ -2237,11 +2242,19 @@ static int did_overwrite_ref(struct send_ctx *sctx,
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* inode 'ino' to be orphanized, therefore check if ow_inode matches
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* the current inode being processed.
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*/
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if ((ow_inode < sctx->send_progress) ||
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(ino != sctx->cur_ino && ow_inode == sctx->cur_ino &&
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gen == sctx->cur_inode_gen))
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if (ow_inode < sctx->send_progress)
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return 1;
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if (ino != sctx->cur_ino && ow_inode == sctx->cur_ino) {
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if (ow_gen == 0) {
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ret = get_inode_gen(sctx->send_root, ow_inode, &ow_gen);
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if (ret < 0)
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return ret;
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}
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if (ow_gen == sctx->cur_inode_gen)
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return 1;
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}
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return 0;
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}
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