* [f2fs-dev] [PATCH] f2fs: add a function to move nid
[not found] <CGME20171028110400epcas1p2cd8fd0105884f449b5116b1ee9cf6092@epcas1p2.samsung.com>
@ 2017-10-28 11:03 ` Fan Li
2017-10-28 11:48 ` Chao Yu
0 siblings, 1 reply; 4+ messages in thread
From: Fan Li @ 2017-10-28 11:03 UTC (permalink / raw)
To: 'Chao Yu', jaegeuk; +Cc: linux-kernel, linux-f2fs-devel
This patch add a new function to move nid from one state to another.
Move operation is heavily used, by adding a new function for it
we can cut down some branches from several flow.
Signed-off-by: Fan li <fanofcode.li@samsung.com>
---
fs/f2fs/node.c | 51 ++++++++++++++++++++++++++++++---------------------
1 file changed, 30 insertions(+), 21 deletions(-)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ac629d6..8116b50
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1763,15 +1763,13 @@ static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
}
static int __insert_free_nid(struct f2fs_sb_info *sbi,
- struct free_nid *i, enum nid_state state, bool new)
+ struct free_nid *i, enum nid_state state)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
- if (new) {
- int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
- if (err)
- return err;
- }
+ int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
+ if (err)
+ return err;
f2fs_bug_on(sbi, state != i->state);
nm_i->nid_cnt[state]++;
@@ -1781,7 +1779,7 @@ static int __insert_free_nid(struct f2fs_sb_info *sbi,
}
static void __remove_free_nid(struct f2fs_sb_info *sbi,
- struct free_nid *i, enum nid_state state, bool reuse)
+ struct free_nid *i, enum nid_state state)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
@@ -1789,8 +1787,23 @@ static void __remove_free_nid(struct f2fs_sb_info *sbi,
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);
+ radix_tree_delete(&nm_i->free_nid_root, i->nid);
+}
+
+static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
+ enum nid_state org_state, enum nid_state dst_state)
+{
+ struct f2fs_nm_info *nm_i = NM_I(sbi);
+
+ f2fs_bug_on(sbi, org_state != i->state);
+ i->state = dst_state;
+ nm_i->nid_cnt[org_state]--;
+ nm_i->nid_cnt[dst_state]++;
+
+ if (org_state == FREE_NID)
+ list_del(&i->list);
+ else if (dst_state == FREE_NID)
+ list_add_tail(&i->list, &nm_i->free_nid_list);
}
/* return if the nid is recognized as free */
@@ -1850,7 +1863,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
}
}
ret = true;
- err = __insert_free_nid(sbi, i, FREE_NID, true);
+ err = __insert_free_nid(sbi, i, FREE_NID);
err_out:
spin_unlock(&nm_i->nid_list_lock);
radix_tree_preload_end();
@@ -1869,7 +1882,7 @@ 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 == FREE_NID) {
- __remove_free_nid(sbi, i, FREE_NID, false);
+ __remove_free_nid(sbi, i, FREE_NID);
need_free = true;
}
spin_unlock(&nm_i->nid_list_lock);
@@ -2080,9 +2093,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
struct free_nid, list);
*nid = i->nid;
- __remove_free_nid(sbi, i, FREE_NID, true);
- i->state = PREALLOC_NID;
- __insert_free_nid(sbi, i, PREALLOC_NID, false);
+ __move_free_nid(sbi, i, FREE_NID, PREALLOC_NID);
nm_i->available_nids--;
update_free_nid_bitmap(sbi, *nid, false, false);
@@ -2108,7 +2119,7 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
+ __remove_free_nid(sbi, i, PREALLOC_NID);
spin_unlock(&nm_i->nid_list_lock);
kmem_cache_free(free_nid_slab, i);
@@ -2131,12 +2142,10 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
+ __remove_free_nid(sbi, i, PREALLOC_NID);
need_free = true;
} else {
- __remove_free_nid(sbi, i, PREALLOC_NID, true);
- i->state = FREE_NID;
- __insert_free_nid(sbi, i, FREE_NID, false);
+ __move_free_nid(sbi, i, PREALLOC_NID, FREE_NID);
}
nm_i->available_nids++;
@@ -2167,7 +2176,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
break;
- __remove_free_nid(sbi, i, FREE_NID, false);
+ __remove_free_nid(sbi, i, FREE_NID);
kmem_cache_free(free_nid_slab, i);
nr_shrink--;
}
@@ -2746,7 +2755,7 @@ 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->free_nid_list, list) {
- __remove_free_nid(sbi, i, FREE_NID, false);
+ __remove_free_nid(sbi, i, FREE_NID);
spin_unlock(&nm_i->nid_list_lock);
kmem_cache_free(free_nid_slab, i);
spin_lock(&nm_i->nid_list_lock);
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [f2fs-dev] [PATCH] f2fs: add a function to move nid
2017-10-28 11:03 ` [f2fs-dev] [PATCH] f2fs: add a function to move nid Fan Li
@ 2017-10-28 11:48 ` Chao Yu
2017-10-30 9:30 ` Jaegeuk Kim
0 siblings, 1 reply; 4+ messages in thread
From: Chao Yu @ 2017-10-28 11:48 UTC (permalink / raw)
To: Fan Li, 'Chao Yu', jaegeuk; +Cc: linux-kernel, linux-f2fs-devel
On 2017/10/28 19:03, Fan Li wrote:
> This patch add a new function to move nid from one state to another.
> Move operation is heavily used, by adding a new function for it
> we can cut down some branches from several flow.
>
>
> Signed-off-by: Fan li <fanofcode.li@samsung.com>
> ---
> fs/f2fs/node.c | 51 ++++++++++++++++++++++++++++++---------------------
> 1 file changed, 30 insertions(+), 21 deletions(-)
>
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index ac629d6..8116b50
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1763,15 +1763,13 @@ static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
> }
>
> static int __insert_free_nid(struct f2fs_sb_info *sbi,
> - struct free_nid *i, enum nid_state state, bool new)
> + struct free_nid *i, enum nid_state state)
> {
> struct f2fs_nm_info *nm_i = NM_I(sbi);
>
> - if (new) {
> - int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> - if (err)
> - return err;
> - }
> + int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> + if (err)
> + return err;
>
> f2fs_bug_on(sbi, state != i->state);
> nm_i->nid_cnt[state]++;
> @@ -1781,7 +1779,7 @@ static int __insert_free_nid(struct f2fs_sb_info *sbi,
> }
>
> static void __remove_free_nid(struct f2fs_sb_info *sbi,
> - struct free_nid *i, enum nid_state state, bool reuse)
> + struct free_nid *i, enum nid_state state)
> {
> struct f2fs_nm_info *nm_i = NM_I(sbi);
>
> @@ -1789,8 +1787,23 @@ static void __remove_free_nid(struct f2fs_sb_info *sbi,
> 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);
> + radix_tree_delete(&nm_i->free_nid_root, i->nid);
> +}
> +
> +static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
> + enum nid_state org_state, enum nid_state dst_state)
> +{
> + struct f2fs_nm_info *nm_i = NM_I(sbi);
> +
> + f2fs_bug_on(sbi, org_state != i->state);
> + i->state = dst_state;
> + nm_i->nid_cnt[org_state]--;
> + nm_i->nid_cnt[dst_state]++;
> +
> + if (org_state == FREE_NID)
Welcome back to community, Fan. :)
Minor, how about "if (dst_stat == PREALLOC_NID)" ?
Otherwise this patch looks good to me, anyway, you can add:
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Thanks,
> + list_del(&i->list);
> + else if (dst_state == FREE_NID)
> + list_add_tail(&i->list, &nm_i->free_nid_list);
> }
>
> /* return if the nid is recognized as free */
> @@ -1850,7 +1863,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
> }
> }
> ret = true;
> - err = __insert_free_nid(sbi, i, FREE_NID, true);
> + err = __insert_free_nid(sbi, i, FREE_NID);
> err_out:
> spin_unlock(&nm_i->nid_list_lock);
> radix_tree_preload_end();
> @@ -1869,7 +1882,7 @@ 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 == FREE_NID) {
> - __remove_free_nid(sbi, i, FREE_NID, false);
> + __remove_free_nid(sbi, i, FREE_NID);
> need_free = true;
> }
> spin_unlock(&nm_i->nid_list_lock);
> @@ -2080,9 +2093,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
> struct free_nid, list);
> *nid = i->nid;
>
> - __remove_free_nid(sbi, i, FREE_NID, true);
> - i->state = PREALLOC_NID;
> - __insert_free_nid(sbi, i, PREALLOC_NID, false);
> + __move_free_nid(sbi, i, FREE_NID, PREALLOC_NID);
> nm_i->available_nids--;
>
> update_free_nid_bitmap(sbi, *nid, false, false);
> @@ -2108,7 +2119,7 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> + __remove_free_nid(sbi, i, PREALLOC_NID);
> spin_unlock(&nm_i->nid_list_lock);
>
> kmem_cache_free(free_nid_slab, i);
> @@ -2131,12 +2142,10 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> + __remove_free_nid(sbi, i, PREALLOC_NID);
> need_free = true;
> } else {
> - __remove_free_nid(sbi, i, PREALLOC_NID, true);
> - i->state = FREE_NID;
> - __insert_free_nid(sbi, i, FREE_NID, false);
> + __move_free_nid(sbi, i, PREALLOC_NID, FREE_NID);
> }
>
> nm_i->available_nids++;
> @@ -2167,7 +2176,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
> nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
> break;
>
> - __remove_free_nid(sbi, i, FREE_NID, false);
> + __remove_free_nid(sbi, i, FREE_NID);
> kmem_cache_free(free_nid_slab, i);
> nr_shrink--;
> }
> @@ -2746,7 +2755,7 @@ 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->free_nid_list, list) {
> - __remove_free_nid(sbi, i, FREE_NID, false);
> + __remove_free_nid(sbi, i, FREE_NID);
> spin_unlock(&nm_i->nid_list_lock);
> kmem_cache_free(free_nid_slab, i);
> spin_lock(&nm_i->nid_list_lock);
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [f2fs-dev] [PATCH] f2fs: add a function to move nid
2017-10-28 11:48 ` Chao Yu
@ 2017-10-30 9:30 ` Jaegeuk Kim
2017-10-30 11:50 ` Fan Li
0 siblings, 1 reply; 4+ messages in thread
From: Jaegeuk Kim @ 2017-10-30 9:30 UTC (permalink / raw)
To: Chao Yu; +Cc: Fan Li, 'Chao Yu', linux-kernel, linux-f2fs-devel
On 10/28, Chao Yu wrote:
> On 2017/10/28 19:03, Fan Li wrote:
> > This patch add a new function to move nid from one state to another.
> > Move operation is heavily used, by adding a new function for it
> > we can cut down some branches from several flow.
> >
> >
> > Signed-off-by: Fan li <fanofcode.li@samsung.com>
> > ---
> > fs/f2fs/node.c | 51 ++++++++++++++++++++++++++++++---------------------
> > 1 file changed, 30 insertions(+), 21 deletions(-)
> >
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index ac629d6..8116b50
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1763,15 +1763,13 @@ static struct free_nid *__lookup_free_nid_list(struct f2fs_nm_info *nm_i,
> > }
> >
> > static int __insert_free_nid(struct f2fs_sb_info *sbi,
> > - struct free_nid *i, enum nid_state state, bool new)
> > + struct free_nid *i, enum nid_state state)
> > {
> > struct f2fs_nm_info *nm_i = NM_I(sbi);
> >
> > - if (new) {
> > - int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > - if (err)
> > - return err;
> > - }
> > + int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > + if (err)
> > + return err;
> >
> > f2fs_bug_on(sbi, state != i->state);
> > nm_i->nid_cnt[state]++;
> > @@ -1781,7 +1779,7 @@ static int __insert_free_nid(struct f2fs_sb_info *sbi,
> > }
> >
> > static void __remove_free_nid(struct f2fs_sb_info *sbi,
> > - struct free_nid *i, enum nid_state state, bool reuse)
> > + struct free_nid *i, enum nid_state state)
> > {
> > struct f2fs_nm_info *nm_i = NM_I(sbi);
> >
> > @@ -1789,8 +1787,23 @@ static void __remove_free_nid(struct f2fs_sb_info *sbi,
> > 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);
> > + radix_tree_delete(&nm_i->free_nid_root, i->nid);
> > +}
> > +
> > +static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
> > + enum nid_state org_state, enum nid_state dst_state)
> > +{
> > + struct f2fs_nm_info *nm_i = NM_I(sbi);
> > +
> > + f2fs_bug_on(sbi, org_state != i->state);
> > + i->state = dst_state;
> > + nm_i->nid_cnt[org_state]--;
> > + nm_i->nid_cnt[dst_state]++;
> > +
> > + if (org_state == FREE_NID)
>
> Welcome back to community, Fan. :)
>
> Minor, how about "if (dst_stat == PREALLOC_NID)" ?
How about this?
switch (dst_state) {
case PREALLOC_NID:
list_del(&i->list);
break;
case FREE_NID:
list_add_tail(&i->list, &nm_i->free_nid_list);
break;
default:
BUG_ON(1);
};
>
> Otherwise this patch looks good to me, anyway, you can add:
>
> Reviewed-by: Chao Yu <yuchao0@huawei.com>
>
> Thanks,
>
> > + list_del(&i->list);
> > + else if (dst_state == FREE_NID)
> > + list_add_tail(&i->list, &nm_i->free_nid_list);
> > }
> >
> > /* return if the nid is recognized as free */
> > @@ -1850,7 +1863,7 @@ static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
> > }
> > }
> > ret = true;
> > - err = __insert_free_nid(sbi, i, FREE_NID, true);
> > + err = __insert_free_nid(sbi, i, FREE_NID);
> > err_out:
> > spin_unlock(&nm_i->nid_list_lock);
> > radix_tree_preload_end();
> > @@ -1869,7 +1882,7 @@ 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 == FREE_NID) {
> > - __remove_free_nid(sbi, i, FREE_NID, false);
> > + __remove_free_nid(sbi, i, FREE_NID);
> > need_free = true;
> > }
> > spin_unlock(&nm_i->nid_list_lock);
> > @@ -2080,9 +2093,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
> > struct free_nid, list);
> > *nid = i->nid;
> >
> > - __remove_free_nid(sbi, i, FREE_NID, true);
> > - i->state = PREALLOC_NID;
> > - __insert_free_nid(sbi, i, PREALLOC_NID, false);
> > + __move_free_nid(sbi, i, FREE_NID, PREALLOC_NID);
> > nm_i->available_nids--;
> >
> > update_free_nid_bitmap(sbi, *nid, false, false);
> > @@ -2108,7 +2119,7 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> > + __remove_free_nid(sbi, i, PREALLOC_NID);
> > spin_unlock(&nm_i->nid_list_lock);
> >
> > kmem_cache_free(free_nid_slab, i);
> > @@ -2131,12 +2142,10 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> > + __remove_free_nid(sbi, i, PREALLOC_NID);
> > need_free = true;
> > } else {
> > - __remove_free_nid(sbi, i, PREALLOC_NID, true);
> > - i->state = FREE_NID;
> > - __insert_free_nid(sbi, i, FREE_NID, false);
> > + __move_free_nid(sbi, i, PREALLOC_NID, FREE_NID);
> > }
> >
> > nm_i->available_nids++;
> > @@ -2167,7 +2176,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
> > nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
> > break;
> >
> > - __remove_free_nid(sbi, i, FREE_NID, false);
> > + __remove_free_nid(sbi, i, FREE_NID);
> > kmem_cache_free(free_nid_slab, i);
> > nr_shrink--;
> > }
> > @@ -2746,7 +2755,7 @@ 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->free_nid_list, list) {
> > - __remove_free_nid(sbi, i, FREE_NID, false);
> > + __remove_free_nid(sbi, i, FREE_NID);
> > spin_unlock(&nm_i->nid_list_lock);
> > kmem_cache_free(free_nid_slab, i);
> > spin_lock(&nm_i->nid_list_lock);
> >
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: [f2fs-dev] [PATCH] f2fs: add a function to move nid
2017-10-30 9:30 ` Jaegeuk Kim
@ 2017-10-30 11:50 ` Fan Li
0 siblings, 0 replies; 4+ messages in thread
From: Fan Li @ 2017-10-30 11:50 UTC (permalink / raw)
To: 'Jaegeuk Kim', 'Chao Yu'
Cc: 'Chao Yu', linux-kernel, linux-f2fs-devel
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> Sent: Monday, October 30, 2017 5:30 PM
> To: Chao Yu
> Cc: Fan Li; 'Chao Yu'; linux-kernel@vger.kernel.org; linux-f2fs-devel@lists.sourceforge.net
> Subject: Re: [f2fs-dev] [PATCH] f2fs: add a function to move nid
>
> On 10/28, Chao Yu wrote:
> > On 2017/10/28 19:03, Fan Li wrote:
> > > This patch add a new function to move nid from one state to another.
> > > Move operation is heavily used, by adding a new function for it we
> > > can cut down some branches from several flow.
> > >
> > >
> > > Signed-off-by: Fan li <fanofcode.li@samsung.com>
> > > ---
> > > fs/f2fs/node.c | 51
> > > ++++++++++++++++++++++++++++++---------------------
> > > 1 file changed, 30 insertions(+), 21 deletions(-)
> > >
> > > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index ac629d6..8116b50
> > > --- a/fs/f2fs/node.c
> > > +++ b/fs/f2fs/node.c
> > > @@ -1763,15 +1763,13 @@ static struct free_nid
> > > *__lookup_free_nid_list(struct f2fs_nm_info *nm_i, }
> > >
> > > static int __insert_free_nid(struct f2fs_sb_info *sbi,
> > > - struct free_nid *i, enum nid_state state, bool new)
> > > + struct free_nid *i, enum nid_state state)
> > > {
> > > struct f2fs_nm_info *nm_i = NM_I(sbi);
> > >
> > > - if (new) {
> > > - int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > > - if (err)
> > > - return err;
> > > - }
> > > + int err = radix_tree_insert(&nm_i->free_nid_root, i->nid, i);
> > > + if (err)
> > > + return err;
> > >
> > > f2fs_bug_on(sbi, state != i->state);
> > > nm_i->nid_cnt[state]++;
> > > @@ -1781,7 +1779,7 @@ static int __insert_free_nid(struct
> > > f2fs_sb_info *sbi, }
> > >
> > > static void __remove_free_nid(struct f2fs_sb_info *sbi,
> > > - struct free_nid *i, enum nid_state state, bool reuse)
> > > + struct free_nid *i, enum nid_state state)
> > > {
> > > struct f2fs_nm_info *nm_i = NM_I(sbi);
> > >
> > > @@ -1789,8 +1787,23 @@ static void __remove_free_nid(struct f2fs_sb_info *sbi,
> > > 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);
> > > + radix_tree_delete(&nm_i->free_nid_root, i->nid); }
> > > +
> > > +static void __move_free_nid(struct f2fs_sb_info *sbi, struct free_nid *i,
> > > + enum nid_state org_state, enum nid_state dst_state) {
> > > + struct f2fs_nm_info *nm_i = NM_I(sbi);
> > > +
> > > + f2fs_bug_on(sbi, org_state != i->state);
> > > + i->state = dst_state;
> > > + nm_i->nid_cnt[org_state]--;
> > > + nm_i->nid_cnt[dst_state]++;
> > > +
> > > + if (org_state == FREE_NID)
> >
> > Welcome back to community, Fan. :)
> >
> > Minor, how about "if (dst_stat == PREALLOC_NID)" ?
>
> How about this?
>
> switch (dst_state) {
> case PREALLOC_NID:
> list_del(&i->list);
> break;
> case FREE_NID:
> list_add_tail(&i->list, &nm_i->free_nid_list);
> break;
> default:
> BUG_ON(1);
> };
>
I had thought about it, the reason why I finally chose the current version is because
" dst_state== PREALLOC_NID" implies that all states other than PREALLOC_NID
are in a list, so we need to call list_del.
Of course it's true now, but in the future if we add more states which aren't in a list,
it would be harder for us to track this branch to modify it since it's not related to
FREE_NID explicitly.
However the difference is trivial, if you think it's not a big deal, it's fine by me.
> >
> > Otherwise this patch looks good to me, anyway, you can add:
> >
> > Reviewed-by: Chao Yu <yuchao0@huawei.com>
> >
> > Thanks,
> >
> > > + list_del(&i->list);
> > > + else if (dst_state == FREE_NID)
> > > + list_add_tail(&i->list, &nm_i->free_nid_list);
> > > }
> > >
> > > /* return if the nid is recognized as free */ @@ -1850,7 +1863,7 @@
> > > static bool add_free_nid(struct f2fs_sb_info *sbi, nid_t nid, bool build)
> > > }
> > > }
> > > ret = true;
> > > - err = __insert_free_nid(sbi, i, FREE_NID, true);
> > > + err = __insert_free_nid(sbi, i, FREE_NID);
> > > err_out:
> > > spin_unlock(&nm_i->nid_list_lock);
> > > radix_tree_preload_end();
> > > @@ -1869,7 +1882,7 @@ 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 == FREE_NID) {
> > > - __remove_free_nid(sbi, i, FREE_NID, false);
> > > + __remove_free_nid(sbi, i, FREE_NID);
> > > need_free = true;
> > > }
> > > spin_unlock(&nm_i->nid_list_lock);
> > > @@ -2080,9 +2093,7 @@ bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
> > > struct free_nid, list);
> > > *nid = i->nid;
> > >
> > > - __remove_free_nid(sbi, i, FREE_NID, true);
> > > - i->state = PREALLOC_NID;
> > > - __insert_free_nid(sbi, i, PREALLOC_NID, false);
> > > + __move_free_nid(sbi, i, FREE_NID, PREALLOC_NID);
> > > nm_i->available_nids--;
> > >
> > > update_free_nid_bitmap(sbi, *nid, false, false); @@ -2108,7
> > > +2119,7 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> > > + __remove_free_nid(sbi, i, PREALLOC_NID);
> > > spin_unlock(&nm_i->nid_list_lock);
> > >
> > > kmem_cache_free(free_nid_slab, i); @@ -2131,12 +2142,10 @@ 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_free_nid(sbi, i, PREALLOC_NID, false);
> > > + __remove_free_nid(sbi, i, PREALLOC_NID);
> > > need_free = true;
> > > } else {
> > > - __remove_free_nid(sbi, i, PREALLOC_NID, true);
> > > - i->state = FREE_NID;
> > > - __insert_free_nid(sbi, i, FREE_NID, false);
> > > + __move_free_nid(sbi, i, PREALLOC_NID, FREE_NID);
> > > }
> > >
> > > nm_i->available_nids++;
> > > @@ -2167,7 +2176,7 @@ int try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
> > > nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
> > > break;
> > >
> > > - __remove_free_nid(sbi, i, FREE_NID, false);
> > > + __remove_free_nid(sbi, i, FREE_NID);
> > > kmem_cache_free(free_nid_slab, i);
> > > nr_shrink--;
> > > }
> > > @@ -2746,7 +2755,7 @@ 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->free_nid_list, list) {
> > > - __remove_free_nid(sbi, i, FREE_NID, false);
> > > + __remove_free_nid(sbi, i, FREE_NID);
> > > spin_unlock(&nm_i->nid_list_lock);
> > > kmem_cache_free(free_nid_slab, i);
> > > spin_lock(&nm_i->nid_list_lock);
> > >
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-10-30 11:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2017-10-28 11:03 ` [f2fs-dev] [PATCH] f2fs: add a function to move nid Fan Li
2017-10-28 11:48 ` Chao Yu
2017-10-30 9:30 ` Jaegeuk Kim
2017-10-30 11:50 ` Fan Li
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