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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2014-04-07 15:38:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:36:00 -0700
commitb67d1ec189ffb92cdad9b2bd29475fb1e0166983 (patch)
tree47ee59a17c86fe9e7e778eb89069178ae775f321 /drivers/block
parent8dd1d3247e6c00b50ef83934ea8b22a1590015de (diff)
zram: delete zram_init_device()
allocate new `zram_meta' in disksize_store() only for uninitialised zram device, saving a number of allocations and deallocations in case if disksize_store() was called on currently used device. at the same time zram_meta stack variable is not necessary, because we can set ->meta directly. there is also no need in setting QUEUE_FLAG_NONROT queue on every disksize_store(), set it once during device creation. [minchan@kernel.org: handle zram->meta alloc fail case] [minchan@kernel.org: prevent lockdep spew of init_lock] Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Minchan Kim <minchan@kernel.org> Acked-by: Jerome Marchand <jmarchan@redhat.com> Cc: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/zram/zram_drv.c16
1 files changed, 5 insertions, 11 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 21aee3edcb25..76ba67673a90 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -533,14 +533,6 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity)
up_write(&zram->init_lock);
}
-static void zram_init_device(struct zram *zram, struct zram_meta *meta)
-{
- /* zram devices sort of resembles non-rotational disks */
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
- zram->meta = meta;
- pr_debug("Initialization done!\n");
-}
-
static ssize_t disksize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
@@ -556,17 +548,18 @@ static ssize_t disksize_store(struct device *dev,
meta = zram_meta_alloc(disksize);
if (!meta)
return -ENOMEM;
+
down_write(&zram->init_lock);
if (init_done(zram)) {
- up_write(&zram->init_lock);
zram_meta_free(meta);
+ up_write(&zram->init_lock);
pr_info("Cannot change disksize for initialized device\n");
return -EBUSY;
}
+ zram->meta = meta;
zram->disksize = disksize;
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
- zram_init_device(zram, meta);
up_write(&zram->init_lock);
return len;
@@ -776,7 +769,8 @@ static int create_device(struct zram *zram, int device_id)
/* Actual capacity set using syfs (/sys/block/zram<id>/disksize */
set_capacity(zram->disk, 0);
-
+ /* zram devices sort of resembles non-rotational disks */
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
/*
* To ensure that we always get PAGE_SIZE aligned
* and n*PAGE_SIZED sized I/O requests.