Messages in this thread | | | Date | Tue, 4 Apr 2017 13:52:48 +0900 | From | Minchan Kim <> | Subject | Re: [PATCH 4/5] zram: remove zram_meta structure |
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On Tue, Apr 04, 2017 at 11:31:15AM +0900, Sergey Senozhatsky wrote: > On (04/03/17 14:17), Minchan Kim wrote: > [..] > > -static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize) > > +static bool zram_meta_alloc(struct zram *zram, u64 disksize) > > { > > size_t num_pages; > > - struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL); > > - > > - if (!meta) > > - return NULL; > > > > num_pages = disksize >> PAGE_SHIFT; > > - meta->table = vzalloc(num_pages * sizeof(*meta->table)); > > - if (!meta->table) { > > - pr_err("Error allocating zram address table\n"); > > - goto out_error; > > - } > > + zram->table = vzalloc(num_pages * sizeof(*zram->table)); > > + if (!zram->table) > > + return false; > > > > - meta->mem_pool = zs_create_pool(pool_name); > > - if (!meta->mem_pool) { > > - pr_err("Error creating memory pool\n"); > > - goto out_error; > > + zram->mem_pool = zs_create_pool(zram->disk->disk_name); > > + if (!zram->mem_pool) { > > + vfree(zram->table); > > + return false; > > } > > > > - return meta; > > - > > -out_error: > > - vfree(meta->table); > > - kfree(meta); > > - return NULL; > > + return true; > > } > > [..] > > > @@ -1020,7 +989,6 @@ static ssize_t disksize_store(struct device *dev, > > { > > u64 disksize; > > struct zcomp *comp; > > - struct zram_meta *meta; > > struct zram *zram = dev_to_zram(dev); > > int err; > > > > @@ -1029,8 +997,7 @@ static ssize_t disksize_store(struct device *dev, > > return -EINVAL; > > > > disksize = PAGE_ALIGN(disksize); > > - meta = zram_meta_alloc(zram->disk->disk_name, disksize); > > - if (!meta) > > + if (!zram_meta_alloc(zram, disksize)) > > return -ENOMEM; > > > > comp = zcomp_create(zram->compressor); > > @@ -1048,7 +1015,6 @@ static ssize_t disksize_store(struct device *dev, > > goto out_destroy_comp; > > } > > > > - zram->meta = meta; > > zram->comp = comp; > > zram->disksize = disksize; > > set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); > > @@ -1061,7 +1027,7 @@ static ssize_t disksize_store(struct device *dev, > > up_write(&zram->init_lock); > > zcomp_destroy(comp); > > out_free_meta: > > - zram_meta_free(meta, disksize); > > + zram_meta_free(zram, disksize); > > return err; > > } > > OK, I don't think it's the same. > > we used to have > > struct zram_meta *zram_meta_alloc() > { > meta->table = vzalloc() > meta->mem_pool = zs_create_pool(); > return meta; > } > > > disksize_store() > { > meta = zram_meta_alloc(); > if (init_done(zram)) { > pr_info("Cannot change disksize for initialized device\n"); > goto out_destroy_comp; > } > > zram->meta = meta; > ^^^^^^^^^^^^^^^^^^ > } > > now we have > > struct zram_meta *zram_meta_alloc() > { > zram->table = vzalloc() > zram->mem_pool = zs_create_pool(); > return true; > } > > > disksize_store() > { > zram_meta_alloc(); > ^^^^^^^^^^^^^^^^^ > if (init_done(zram)) { > pr_info("Cannot change disksize for initialized device\n"); > goto out_destroy_comp; > } > } > > > by the time we call init_done(zram) on already init device zram->table > and zram->mem_pool are overwritten and lost. right?
Right you are. I will fix it!
> > > [..] > > -struct zram_meta { > > +struct zram { > > struct zram_table_entry *table; > > struct zs_pool *mem_pool; > > -}; > > - > > -struct zram { > > - struct zram_meta *meta; > > struct zcomp *comp; > > struct gendisk *disk; > > /* Prevent concurrent execution of device init */ > > > we still have several zram_meta_FOO() left overs in zram_drv.c > > -ss
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