diff options
Diffstat (limited to 'fs/btrfs/sysfs.c')
| -rw-r--r-- | fs/btrfs/sysfs.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c index 5211d13d73f8..53b846d99ece 100644 --- a/fs/btrfs/sysfs.c +++ b/fs/btrfs/sysfs.c @@ -1313,7 +1313,22 @@ static const char *btrfs_read_policy_name[] = { #endif }; -static int btrfs_read_policy_to_enum(const char *str, s64 *value_ret) +#ifdef CONFIG_BTRFS_EXPERIMENTAL + +/* Global module configuration parameters. */ +static char *read_policy; +char *btrfs_get_mod_read_policy(void) +{ + return read_policy; +} + +/* Set perms to 0, disable /sys/module/btrfs/parameter/read_policy interface. */ +module_param(read_policy, charp, 0); +MODULE_PARM_DESC(read_policy, +"Global read policy: pid (default), round-robin[:<min_contig_read>], devid[:<devid>]"); +#endif + +int btrfs_read_policy_to_enum(const char *str, s64 *value_ret) { char param[32] = { 0 }; char __maybe_unused *value_str; @@ -1344,6 +1359,20 @@ static int btrfs_read_policy_to_enum(const char *str, s64 *value_ret) return sysfs_match_string(btrfs_read_policy_name, param); } +#ifdef CONFIG_BTRFS_EXPERIMENTAL +int __init btrfs_read_policy_init(void) +{ + s64 value; + + if (btrfs_read_policy_to_enum(read_policy, &value) == -EINVAL) { + btrfs_err(NULL, "invalid read policy or value %s", read_policy); + return -EINVAL; + } + + return 0; +} +#endif + static ssize_t btrfs_read_policy_show(struct kobject *kobj, struct kobj_attribute *a, char *buf) { |