diff options
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index ff6724bbdf91..e29e952b99c3 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -998,6 +998,72 @@ static int __comp_algorithm_store(struct zram *zram, u32 prio, const char *buf) return 0; } +static int comp_params_store(struct zram *zram, u32 prio, s32 level) +{ + zram->params[prio].level = level; + return 0; +} + +static ssize_t algorithm_params_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + s32 prio = ZRAM_PRIMARY_COMP, level = ZCOMP_PARAM_NO_LEVEL; + char *args, *param, *val, *algo = NULL; + struct zram *zram = dev_to_zram(dev); + int ret; + + args = skip_spaces(buf); + while (*args) { + args = next_arg(args, ¶m, &val); + + if (!val || !*val) + return -EINVAL; + + if (!strcmp(param, "priority")) { + ret = kstrtoint(val, 10, &prio); + if (ret) + return ret; + continue; + } + + if (!strcmp(param, "level")) { + ret = kstrtoint(val, 10, &level); + if (ret) + return ret; + continue; + } + + if (!strcmp(param, "algo")) { + algo = val; + continue; + } + } + + /* Lookup priority by algorithm name */ + if (algo) { + s32 p; + + prio = -EINVAL; + for (p = ZRAM_PRIMARY_COMP; p < ZRAM_MAX_COMPS; p++) { + if (!zram->comp_algs[p]) + continue; + + if (!strcmp(zram->comp_algs[p], algo)) { + prio = p; + break; + } + } + } + + if (prio < ZRAM_PRIMARY_COMP || prio >= ZRAM_MAX_COMPS) + return -EINVAL; + + ret = comp_params_store(zram, prio, level); + return ret ? ret : len; +} + static ssize_t comp_algorithm_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -2169,6 +2235,7 @@ static DEVICE_ATTR_RW(writeback_limit_enable); static DEVICE_ATTR_RW(recomp_algorithm); static DEVICE_ATTR_WO(recompress); #endif +static DEVICE_ATTR_WO(algorithm_params); static struct attribute *zram_disk_attrs[] = { &dev_attr_disksize.attr, @@ -2196,6 +2263,7 @@ static struct attribute *zram_disk_attrs[] = { &dev_attr_recomp_algorithm.attr, &dev_attr_recompress.attr, #endif + &dev_attr_algorithm_params.attr, NULL, }; |