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f2fs: obsolete ALLOC_NID_LIST list 

As Fan Li reported, there is no user traversing nid_list[ALLOC_NID_LIST]
which is used for tracking preallocated nids. Let's drop it, and only
track preallocated nids in free_nid_root radix-tree.

Reported-by: Fan Li <fanofcode.li@samsung.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-09-29 13:59:35 +08:00 committed by Jaegeuk Kim
parent 71ad682c1c
commit 9a4ffdf558
5 changed files with 64 additions and 73 deletions
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8
fs/f2fs/debug.c
View File

@ -98,9 +98,9 @@ static void update_general_status(struct f2fs_sb_info *sbi)
si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
si->sits = MAIN_SEGS(sbi);
si->dirty_sits = SIT_I(sbi)->dirty_sentries;
si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID_LIST];
si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];
si->avail_nids = NM_I(sbi)->available_nids;
si->alloc_nids = NM_I(sbi)->nid_cnt[ALLOC_NID_LIST];
si->alloc_nids = NM_I(sbi)->nid_cnt[PREALLOC_NID];
si->bg_gc = sbi->bg_gc;
si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
* 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
@ -233,8 +233,8 @@ get_cache:
}
/* free nids */
si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID_LIST] +
NM_I(sbi)->nid_cnt[ALLOC_NID_LIST]) *
si->cache_mem += (NM_I(sbi)->nid_cnt[FREE_NID] +
NM_I(sbi)->nid_cnt[PREALLOC_NID]) *
sizeof(struct free_nid);
si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
si->cache_mem += NM_I(sbi)->dirty_nat_cnt *

15
fs/f2fs/f2fs.h
View File

@ -666,10 +666,13 @@ static inline void __try_update_largest_extent(struct inode *inode,
}
}
enum nid_list {
FREE_NID_LIST,
ALLOC_NID_LIST,
MAX_NID_LIST,
/*
* For free nid management
*/
enum nid_state {
FREE_NID, /* newly added to free nid list */
PREALLOC_NID, /* it is preallocated */
MAX_NID_STATE,
};
struct f2fs_nm_info {
@ -692,8 +695,8 @@ struct f2fs_nm_info {
/* free node ids management */
struct radix_tree_root free_nid_root;/* root of the free_nid cache */
struct list_head nid_list[MAX_NID_LIST];/* lists for free nids */
unsigned int nid_cnt[MAX_NID_LIST]; /* the number of free node id */
struct list_head free_nid_list; /* list for free nids excluding preallocated nids */
unsigned int nid_cnt[MAX_NID_STATE]; /* the number of free node id */
spinlock_t nid_list_lock; /* protect nid lists ops */
struct mutex build_lock; /* lock for build free nids */
unsigned char (*free_nid_bitmap)[NAT_ENTRY_BITMAP_SIZE];

97
fs/f2fs/node.c
View File

@ -46,7 +46,7 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
* give 25%, 25%, 50%, 50%, 50% memory for each components respectively
*/
if (type == FREE_NIDS) {
mem_size = (nm_i->nid_cnt[FREE_NID_LIST] *
mem_size = (nm_i->nid_cnt[FREE_NID] *
sizeof(struct free_nid)) >> PAGE_SHIFT;
res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 2);
} else if (type == NAT_ENTRIES) {
@ -1757,8 +1757,8 @@ static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
return radix_tree_lookup(&nm_i->free_nid_root, n);
}
static int __insert_nid_to_list(struct f2fs_sb_info *sbi,
struct free_nid *i, enum nid_list list, bool new)
static int __insert_free_nid(struct f2fs_sb_info *sbi,
struct free_nid *i, enum nid_state state, bool new)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
@ -1768,22 +1768,22 @@ static int __insert_nid_to_list(struct f2fs_sb_info *sbi,
return err;
}
f2fs_bug_on(sbi, list == FREE_NID_LIST ? i->state != NID_NEW :
i->state != NID_ALLOC);
nm_i->nid_cnt[list]++;
list_add_tail(&i->list, &nm_i->nid_list[list]);
f2fs_bug_on(sbi, state != i->state);
nm_i->nid_cnt[state]++;
if (state == FREE_NID)
list_add_tail(&i->list, &nm_i->free_nid_list);
return 0;
}
static void __remove_nid_from_list(struct f2fs_sb_info *sbi,
struct free_nid *i, enum nid_list list, bool reuse)
static void __remove_free_nid(struct f2fs_sb_info *sbi,
struct free_nid *i, enum nid_state state, bool reuse)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
f2fs_bug_on(sbi, list == FREE_NID_LIST ? i->state != NID_NEW :
i->state != NID_ALLOC);
nm_i->nid_cnt[list]--;
list_del(&i->list);
f2fs_bug_on(sbi, state != i->state);
nm_i->nid_cnt[state]--;
if (state == FREE_NID)
list_del(&i->list);
if (!reuse)
radix_tree_delete(&nm_i->free_nid_root, i->nid);
}
@ -1803,7 +1803,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
i = f2fs_kmem_cache_alloc(free_nid_slab, GFP_NOFS);
i->nid = nid;
i->state = NID_NEW;
i->state = FREE_NID;
if (radix_tree_preload(GFP_NOFS))
goto err;
@ -1816,7 +1816,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
* - f2fs_create
* - f2fs_new_inode
* - alloc_nid
* - __insert_nid_to_list(ALLOC_NID_LIST)
* - __insert_nid_to_list(PREALLOC_NID)
* - f2fs_balance_fs_bg
* - build_free_nids
* - __build_free_nids
@ -1829,8 +1829,8 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
* - new_node_page
* - set_node_addr
* - alloc_nid_done
* - __remove_nid_from_list(ALLOC_NID_LIST)
* - __insert_nid_to_list(FREE_NID_LIST)
* - __remove_nid_from_list(PREALLOC_NID)
* - __insert_nid_to_list(FREE_NID)
*/
ne = __lookup_nat_cache(nm_i, nid);
if (ne && (!get_nat_flag(ne, IS_CHECKPOINTED) ||
@ -1839,13 +1839,13 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
e = __lookup_free_nid_list(nm_i, nid);
if (e) {
if (e->state == NID_NEW)
if (e->state == FREE_NID)
ret = true;
goto err_out;
}
}
ret = true;
err = __insert_nid_to_list(sbi, i, FREE_NID_LIST, true);
err = __insert_free_nid(sbi, i, FREE_NID, true);
err_out:
spin_unlock(&nm_i->nid_list_lock);
radix_tree_preload_end();
@ -1863,8 +1863,8 @@ static void remove_free_nid(struct f2fs_sb_info *sbi, nid_t nid)
spin_lock(&nm_i->nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
if (i && i->state == NID_NEW) {
__remove_nid_from_list(sbi, i, FREE_NID_LIST, false);
if (i && i->state == FREE_NID) {
__remove_free_nid(sbi, i, FREE_NID, false);
need_free = true;
}
spin_unlock(&nm_i->nid_list_lock);
@ -1949,7 +1949,7 @@ static void scan_free_nid_bits(struct f2fs_sb_info *sbi)
nid = i * NAT_ENTRY_PER_BLOCK + idx;
add_free_nid(sbi, nid, true);
if (nm_i->nid_cnt[FREE_NID_LIST] >= MAX_FREE_NIDS)
if (nm_i->nid_cnt[FREE_NID] >= MAX_FREE_NIDS)
goto out;
}
}
@ -1982,7 +1982,7 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
nid = 0;
/* Enough entries */
if (nm_i->nid_cnt[FREE_NID_LIST] >= NAT_ENTRY_PER_BLOCK)
if (nm_i->nid_cnt[FREE_NID] >= NAT_ENTRY_PER_BLOCK)
return;
if (!sync && !available_free_memory(sbi, FREE_NIDS))
@ -1992,7 +1992,7 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
/* try to find free nids in free_nid_bitmap */
scan_free_nid_bits(sbi);
if (nm_i->nid_cnt[FREE_NID_LIST])
if (nm_i->nid_cnt[FREE_NID])
return;
}
@ -2069,15 +2069,15 @@ retry:
}
/* We should not use stale free nids created by build_free_nids */
if (nm_i->nid_cnt[FREE_NID_LIST] && !on_build_free_nids(nm_i)) {
f2fs_bug_on(sbi, list_empty(&nm_i->nid_list[FREE_NID_LIST]));
i = list_first_entry(&nm_i->nid_list[FREE_NID_LIST],
if (nm_i->nid_cnt[FREE_NID] && !on_build_free_nids(nm_i)) {
f2fs_bug_on(sbi, list_empty(&nm_i->free_nid_list));
i = list_first_entry(&nm_i->free_nid_list,
struct free_nid, list);
*nid = i->nid;
__remove_nid_from_list(sbi, i, FREE_NID_LIST, true);
i->state = NID_ALLOC;
__insert_nid_to_list(sbi, i, ALLOC_NID_LIST, false);
__remove_free_nid(sbi, i, FREE_NID, true);
i->state = PREALLOC_NID;
__insert_free_nid(sbi, i, PREALLOC_NID, false);
nm_i->available_nids--;
update_free_nid_bitmap(sbi, *nid, false, false);
@ -2103,7 +2103,7 @@ void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid)
spin_lock(&nm_i->nid_list_lock);
i = __lookup_free_nid_list(nm_i, nid);
f2fs_bug_on(sbi, !i);
__remove_nid_from_list(sbi, i, ALLOC_NID_LIST, false);
__remove_free_nid(sbi, i, PREALLOC_NID, false);
spin_unlock(&nm_i->nid_list_lock);
kmem_cache_free(free_nid_slab, i);
@ -2126,12 +2126,12 @@ void alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
f2fs_bug_on(sbi, !i);
if (!available_free_memory(sbi, FREE_NIDS)) {
__remove_nid_from_list(sbi, i, ALLOC_NID_LIST, false);
__remove_free_nid(sbi, i, PREALLOC_NID, false);
need_free = true;
} else {
__remove_nid_from_list(sbi, i, ALLOC_NID_LIST, true);
i->state = NID_NEW;
__insert_nid_to_list(sbi, i, FREE_NID_LIST, false);
__remove_free_nid(sbi, i, PREALLOC_NID, true);
i->state = FREE_NID;
__insert_free_nid(sbi, i, FREE_NID, false);
}
nm_i->available_nids++;
@ -2150,20 +2150,19 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
struct free_nid *i, *next;
int nr = nr_shrink;
if (nm_i->nid_cnt[FREE_NID_LIST] <= MAX_FREE_NIDS)
if (nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
return 0;
if (!mutex_trylock(&nm_i->build_lock))
return 0;
spin_lock(&nm_i->nid_list_lock);
list_for_each_entry_safe(i, next, &nm_i->nid_list[FREE_NID_LIST],
list) {
list_for_each_entry_safe(i, next, &nm_i->free_nid_list, list) {
if (nr_shrink <= 0 ||
nm_i->nid_cnt[FREE_NID_LIST] <= MAX_FREE_NIDS)
nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
break;
__remove_nid_from_list(sbi, i, FREE_NID_LIST, false);
__remove_free_nid(sbi, i, FREE_NID, false);
kmem_cache_free(free_nid_slab, i);
nr_shrink--;
}
@ -2635,16 +2634,15 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
/* not used nids: 0, node, meta, (and root counted as valid node) */
nm_i->available_nids = nm_i->max_nid - sbi->total_valid_node_count -
F2FS_RESERVED_NODE_NUM;
nm_i->nid_cnt[FREE_NID_LIST] = 0;
nm_i->nid_cnt[ALLOC_NID_LIST] = 0;
nm_i->nid_cnt[FREE_NID] = 0;
nm_i->nid_cnt[PREALLOC_NID] = 0;
nm_i->nat_cnt = 0;
nm_i->ram_thresh = DEF_RAM_THRESHOLD;
nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
INIT_LIST_HEAD(&nm_i->nid_list[FREE_NID_LIST]);
INIT_LIST_HEAD(&nm_i->nid_list[ALLOC_NID_LIST]);
INIT_LIST_HEAD(&nm_i->free_nid_list);
INIT_RADIX_TREE(&nm_i->nat_root, GFP_NOIO);
INIT_RADIX_TREE(&nm_i->nat_set_root, GFP_NOIO);
INIT_LIST_HEAD(&nm_i->nat_entries);
@ -2736,16 +2734,15 @@ void destroy_node_manager(struct f2fs_sb_info *sbi)
/* destroy free nid list */
spin_lock(&nm_i->nid_list_lock);
list_for_each_entry_safe(i, next_i, &nm_i->nid_list[FREE_NID_LIST],
list) {
__remove_nid_from_list(sbi, i, FREE_NID_LIST, false);
list_for_each_entry_safe(i, next_i, &nm_i->free_nid_list, list) {
__remove_free_nid(sbi, i, FREE_NID, false);
spin_unlock(&nm_i->nid_list_lock);
kmem_cache_free(free_nid_slab, i);
spin_lock(&nm_i->nid_list_lock);
}
f2fs_bug_on(sbi, nm_i->nid_cnt[FREE_NID_LIST]);
f2fs_bug_on(sbi, nm_i->nid_cnt[ALLOC_NID_LIST]);
f2fs_bug_on(sbi, !list_empty(&nm_i->nid_list[ALLOC_NID_LIST]));
f2fs_bug_on(sbi, nm_i->nid_cnt[FREE_NID]);
f2fs_bug_on(sbi, nm_i->nid_cnt[PREALLOC_NID]);
f2fs_bug_on(sbi, !list_empty(&nm_i->free_nid_list));
spin_unlock(&nm_i->nid_list_lock);
/* destroy nat cache */

15
fs/f2fs/node.h
View File

@ -150,18 +150,10 @@ struct nat_entry_set {
unsigned int entry_cnt; /* the # of nat entries in set */
};
/*
* For free nid mangement
*/
enum nid_state {
NID_NEW, /* newly added to free nid list */
NID_ALLOC /* it is allocated */
};
struct free_nid {
struct list_head list; /* for free node id list */
nid_t nid; /* node id */
int state; /* in use or not: NID_NEW or NID_ALLOC */
int state; /* in use or not: FREE_NID or PREALLOC_NID */
};
static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
@ -170,12 +162,11 @@ static inline void next_free_nid(struct f2fs_sb_info *sbi, nid_t *nid)
struct free_nid *fnid;
spin_lock(&nm_i->nid_list_lock);
if (nm_i->nid_cnt[FREE_NID_LIST] <= 0) {
if (nm_i->nid_cnt[FREE_NID] <= 0) {
spin_unlock(&nm_i->nid_list_lock);
return;
}
fnid = list_first_entry(&nm_i->nid_list[FREE_NID_LIST],
struct free_nid, list);
fnid = list_first_entry(&nm_i->free_nid_list, struct free_nid, list);
*nid = fnid->nid;
spin_unlock(&nm_i->nid_list_lock);
}

2
fs/f2fs/shrinker.c
View File

@ -28,7 +28,7 @@ static unsigned long __count_nat_entries(struct f2fs_sb_info *sbi)
static unsigned long __count_free_nids(struct f2fs_sb_info *sbi)
{
long count = NM_I(sbi)->nid_cnt[FREE_NID_LIST] - MAX_FREE_NIDS;
long count = NM_I(sbi)->nid_cnt[FREE_NID] - MAX_FREE_NIDS;
return count > 0 ? count : 0;
}