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f2fs: don't cache nat entry if out of memory 

If we run out of memory, in cache_nat_entry, it's better to avoid loop
for allocating memory to cache nat entry, so in low memory scenario, for
read path of node block, I expect this can avoid unneeded latency.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2016-12-13 18:54:59 +08:00 committed by Jaegeuk Kim
parent fed2466848
commit 5c9e418436
1 changed files with 20 additions and 7 deletions
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27
fs/f2fs/node.c
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@ -245,12 +245,24 @@ bool need_inode_block_update(struct f2fs_sb_info *sbi, nid_t ino)
return need_update; return need_update;
} }
static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid) static struct nat_entry *grab_nat_entry(struct f2fs_nm_info *nm_i, nid_t nid,
bool no_fail)
{ {
struct nat_entry *new; struct nat_entry *new;
new = f2fs_kmem_cache_alloc(nat_entry_slab, GFP_NOFS); if (no_fail) {
f2fs_radix_tree_insert(&nm_i->nat_root, nid, new); new = f2fs_kmem_cache_alloc(nat_entry_slab, GFP_NOFS);
f2fs_radix_tree_insert(&nm_i->nat_root, nid, new);
} else {
new = kmem_cache_alloc(nat_entry_slab, GFP_NOFS);
if (!new)
return NULL;
if (radix_tree_insert(&nm_i->nat_root, nid, new)) {
kmem_cache_free(nat_entry_slab, new);
return NULL;
}
}
memset(new, 0, sizeof(struct nat_entry)); memset(new, 0, sizeof(struct nat_entry));
nat_set_nid(new, nid); nat_set_nid(new, nid);
nat_reset_flag(new); nat_reset_flag(new);
@ -267,8 +279,9 @@ static void cache_nat_entry(struct f2fs_sb_info *sbi, nid_t nid,
e = __lookup_nat_cache(nm_i, nid); e = __lookup_nat_cache(nm_i, nid);
if (!e) { if (!e) {
e = grab_nat_entry(nm_i, nid); e = grab_nat_entry(nm_i, nid, false);
node_info_from_raw_nat(&e->ni, ne); if (e)
node_info_from_raw_nat(&e->ni, ne);
} else { } else {
f2fs_bug_on(sbi, nat_get_ino(e) != le32_to_cpu(ne->ino) || f2fs_bug_on(sbi, nat_get_ino(e) != le32_to_cpu(ne->ino) ||
nat_get_blkaddr(e) != nat_get_blkaddr(e) !=
@ -286,7 +299,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
down_write(&nm_i->nat_tree_lock); down_write(&nm_i->nat_tree_lock);
e = __lookup_nat_cache(nm_i, ni->nid); e = __lookup_nat_cache(nm_i, ni->nid);
if (!e) { if (!e) {
e = grab_nat_entry(nm_i, ni->nid); e = grab_nat_entry(nm_i, ni->nid, true);
copy_node_info(&e->ni, ni); copy_node_info(&e->ni, ni);
f2fs_bug_on(sbi, ni->blk_addr == NEW_ADDR); f2fs_bug_on(sbi, ni->blk_addr == NEW_ADDR);
} else if (new_blkaddr == NEW_ADDR) { } else if (new_blkaddr == NEW_ADDR) {
@ -2152,7 +2165,7 @@ static void remove_nats_in_journal(struct f2fs_sb_info *sbi)
ne = __lookup_nat_cache(nm_i, nid); ne = __lookup_nat_cache(nm_i, nid);
if (!ne) { if (!ne) {
ne = grab_nat_entry(nm_i, nid); ne = grab_nat_entry(nm_i, nid, true);
node_info_from_raw_nat(&ne->ni, &raw_ne); node_info_from_raw_nat(&ne->ni, &raw_ne);
} }