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btrfs: incremental send, move allocation until it's needed in orphan_dir_info

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Move the allocation after the search when it's clear that the new entry
will be added.

Signed-off-by: Robbie Ko <robbieko@synology.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Robbie Ko 2018-05-08 18:11:37 +08:00 committed by David Sterba
parent 2335efafa6
commit 35c8eda12f
1 changed files with 6 additions and 7 deletions
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13
fs/btrfs/send.c
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@ -2844,12 +2844,6 @@ add_orphan_dir_info(struct send_ctx *sctx, u64 dir_ino)
struct rb_node *parent = NULL;
struct orphan_dir_info *entry, *odi;
odi = kmalloc(sizeof(*odi), GFP_KERNEL);
if (!odi)
return ERR_PTR(-ENOMEM);
odi->ino = dir_ino;
odi->gen = 0;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct orphan_dir_info, node);
@ -2858,11 +2852,16 @@ add_orphan_dir_info(struct send_ctx *sctx, u64 dir_ino)
} else if (dir_ino > entry->ino) {
p = &(*p)->rb_right;
} else {
kfree(odi);
return entry;
}
}
odi = kmalloc(sizeof(*odi), GFP_KERNEL);
if (!odi)
return ERR_PTR(-ENOMEM);
odi->ino = dir_ino;
odi->gen = 0;
rb_link_node(&odi->node, parent, p);
rb_insert_color(&odi->node, &sctx->orphan_dirs);
return odi;