2016-09-29 22:49:24

by Ross Zwisler

Subject: [PATCH v4 06/12] dax: consistent variable naming for DAX entries

No functional change.

Consistently use the variable name 'entry' instead of 'ret' for DAX radix
tree entries. This was already happening in most of the code, so update
get_unlocked_mapping_entry(), grab_mapping_entry() and
dax_unlock_mapping_entry().

Signed-off-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/[email protected]>
---
fs/dax.c | 34 +++++++++++++++++-----------------
1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index ac28cdf..baef586 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -357,7 +357,7 @@ static inline void *unlock_slot(struct address_space *mapping, void **slot)
static void *get_unlocked_mapping_entry(struct address_space *mapping,
pgoff_t index, void ***slotp)
{
- void *ret, **slot;
+ void *entry, **slot;
struct wait_exceptional_entry_queue ewait;
wait_queue_head_t *wq = dax_entry_waitqueue(mapping, index);

@@ -367,13 +367,13 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping,
ewait.key.index = index;

for (;;) {
- ret = __radix_tree_lookup(&mapping->page_tree, index, NULL,
+ entry = __radix_tree_lookup(&mapping->page_tree, index, NULL,
&slot);
- if (!ret || !radix_tree_exceptional_entry(ret) ||
+ if (!entry || !radix_tree_exceptional_entry(entry) ||
!slot_locked(mapping, slot)) {
if (slotp)
*slotp = slot;
- return ret;
+ return entry;
}
prepare_to_wait_exclusive(wq, &ewait.wait,
TASK_UNINTERRUPTIBLE);
@@ -396,13 +396,13 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping,
*/
static void *grab_mapping_entry(struct address_space *mapping, pgoff_t index)
{
- void *ret, **slot;
+ void *entry, **slot;

restart:
spin_lock_irq(&mapping->tree_lock);
- ret = get_unlocked_mapping_entry(mapping, index, &slot);
+ entry = get_unlocked_mapping_entry(mapping, index, &slot);
/* No entry for given index? Make sure radix tree is big enough. */
- if (!ret) {
+ if (!entry) {
int err;

spin_unlock_irq(&mapping->tree_lock);
@@ -410,10 +410,10 @@ restart:
mapping_gfp_mask(mapping) & ~__GFP_HIGHMEM);
if (err)
return ERR_PTR(err);
- ret = (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY |
+ entry = (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY |
RADIX_DAX_ENTRY_LOCK);
spin_lock_irq(&mapping->tree_lock);
- err = radix_tree_insert(&mapping->page_tree, index, ret);
+ err = radix_tree_insert(&mapping->page_tree, index, entry);
radix_tree_preload_end();
if (err) {
spin_unlock_irq(&mapping->tree_lock);
@@ -425,11 +425,11 @@ restart:
/* Good, we have inserted empty locked entry into the tree. */
mapping->nrexceptional++;
spin_unlock_irq(&mapping->tree_lock);
- return ret;
+ return entry;
}
/* Normal page in radix tree? */
- if (!radix_tree_exceptional_entry(ret)) {
- struct page *page = ret;
+ if (!radix_tree_exceptional_entry(entry)) {
+ struct page *page = entry;

get_page(page);
spin_unlock_irq(&mapping->tree_lock);
@@ -442,9 +442,9 @@ restart:
}
return page;
}
- ret = lock_slot(mapping, slot);
+ entry = lock_slot(mapping, slot);
spin_unlock_irq(&mapping->tree_lock);
- return ret;
+ return entry;
}

void dax_wake_mapping_entry_waiter(struct address_space *mapping,
@@ -469,11 +469,11 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping,

void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index)
{
- void *ret, **slot;
+ void *entry, **slot;

spin_lock_irq(&mapping->tree_lock);
- ret = __radix_tree_lookup(&mapping->page_tree, index, NULL, &slot);
- if (WARN_ON_ONCE(!ret || !radix_tree_exceptional_entry(ret) ||
+ entry = __radix_tree_lookup(&mapping->page_tree, index, NULL, &slot);
+ if (WARN_ON_ONCE(!entry || !radix_tree_exceptional_entry(entry) ||
!slot_locked(mapping, slot))) {
spin_unlock_irq(&mapping->tree_lock);
return;
--
2.7.4

2016-09-30 08:50:16

by Christoph Hellwig

Subject: Re: [PATCH v4 06/12] dax: consistent variable naming for DAX entries

Looks fine,

Reviewed-by: Christoph Hellwig <[email protected]>

2016-10-03 09:37:32

by Jan Kara

Subject: Re: [PATCH v4 06/12] dax: consistent variable naming for DAX entries

On Thu 29-09-16 16:49:24, Ross Zwisler wrote:
> No functional change.
>
> Consistently use the variable name 'entry' instead of 'ret' for DAX radix
> tree entries. This was already happening in most of the code, so update
> get_unlocked_mapping_entry(), grab_mapping_entry() and
> dax_unlock_mapping_entry().
>
> Signed-off-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/[email protected]>

Looks good. You can add:

Reviewed-by: Jan Kara <[email protected]>

Honza

> ---
> fs/dax.c | 34 +++++++++++++++++-----------------
> 1 file changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index ac28cdf..baef586 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -357,7 +357,7 @@ static inline void *unlock_slot(struct address_space *mapping, void **slot)
> static void *get_unlocked_mapping_entry(struct address_space *mapping,
> pgoff_t index, void ***slotp)
> {
> - void *ret, **slot;
> + void *entry, **slot;
> struct wait_exceptional_entry_queue ewait;
> wait_queue_head_t *wq = dax_entry_waitqueue(mapping, index);
>
> @@ -367,13 +367,13 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping,
> ewait.key.index = index;
>
> for (;;) {
> - ret = __radix_tree_lookup(&mapping->page_tree, index, NULL,
> + entry = __radix_tree_lookup(&mapping->page_tree, index, NULL,
> &slot);
> - if (!ret || !radix_tree_exceptional_entry(ret) ||
> + if (!entry || !radix_tree_exceptional_entry(entry) ||
> !slot_locked(mapping, slot)) {
> if (slotp)
> *slotp = slot;
> - return ret;
> + return entry;
> }
> prepare_to_wait_exclusive(wq, &ewait.wait,
> TASK_UNINTERRUPTIBLE);
> @@ -396,13 +396,13 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping,
> */
> static void *grab_mapping_entry(struct address_space *mapping, pgoff_t index)
> {
> - void *ret, **slot;
> + void *entry, **slot;
>
> restart:
> spin_lock_irq(&mapping->tree_lock);
> - ret = get_unlocked_mapping_entry(mapping, index, &slot);
> + entry = get_unlocked_mapping_entry(mapping, index, &slot);
> /* No entry for given index? Make sure radix tree is big enough. */
> - if (!ret) {
> + if (!entry) {
> int err;
>
> spin_unlock_irq(&mapping->tree_lock);
> @@ -410,10 +410,10 @@ restart:
> mapping_gfp_mask(mapping) & ~__GFP_HIGHMEM);
> if (err)
> return ERR_PTR(err);
> - ret = (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY |
> + entry = (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY |
> RADIX_DAX_ENTRY_LOCK);
> spin_lock_irq(&mapping->tree_lock);
> - err = radix_tree_insert(&mapping->page_tree, index, ret);
> + err = radix_tree_insert(&mapping->page_tree, index, entry);
> radix_tree_preload_end();
> if (err) {
> spin_unlock_irq(&mapping->tree_lock);
> @@ -425,11 +425,11 @@ restart:
> /* Good, we have inserted empty locked entry into the tree. */
> mapping->nrexceptional++;
> spin_unlock_irq(&mapping->tree_lock);
> - return ret;
> + return entry;
> }
> /* Normal page in radix tree? */
> - if (!radix_tree_exceptional_entry(ret)) {
> - struct page *page = ret;
> + if (!radix_tree_exceptional_entry(entry)) {
> + struct page *page = entry;
>
> get_page(page);
> spin_unlock_irq(&mapping->tree_lock);
> @@ -442,9 +442,9 @@ restart:
> }
> return page;
> }
> - ret = lock_slot(mapping, slot);
> + entry = lock_slot(mapping, slot);
> spin_unlock_irq(&mapping->tree_lock);
> - return ret;
> + return entry;
> }
>
> void dax_wake_mapping_entry_waiter(struct address_space *mapping,
> @@ -469,11 +469,11 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping,
>
> void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index)
> {
> - void *ret, **slot;
> + void *entry, **slot;
>
> spin_lock_irq(&mapping->tree_lock);
> - ret = __radix_tree_lookup(&mapping->page_tree, index, NULL, &slot);
> - if (WARN_ON_ONCE(!ret || !radix_tree_exceptional_entry(ret) ||
> + entry = __radix_tree_lookup(&mapping->page_tree, index, NULL, &slot);
> + if (WARN_ON_ONCE(!entry || !radix_tree_exceptional_entry(entry) ||
> !slot_locked(mapping, slot))) {
> spin_unlock_irq(&mapping->tree_lock);
> return;
> --
> 2.7.4
>
>
--
Jan Kara <jack-IBi9RG/[email protected]>
SUSE Labs, CR