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Add limits to spa_slop_shift tunable
This change adds limits to the possible spa_slop_shift values set via the sysfs interface. Accepted values are from a minimum of 1 to a maximum of 31 (inclusive): these limits are based on the following values observed on a 128PB file-vdev test pool: spa_slop_shift=1, spa_get_slop_space=63.5PiB spa_slop_shift=2, spa_get_slop_space=31.8PiB spa_slop_shift=3, spa_get_slop_space=15.9PiB spa_slop_shift=4, spa_get_slop_space=7.9PiB spa_slop_shift=5, spa_get_slop_space=4PiB spa_slop_shift=6, spa_get_slop_space=2PiB ... spa_slop_shift=25, spa_get_slop_space=4GiB spa_slop_shift=26, spa_get_slop_space=2GiB spa_slop_shift=27, spa_get_slop_space=1016MiB spa_slop_shift=28, spa_get_slop_space=508MiB spa_slop_shift=29, spa_get_slop_space=254MiB spa_slop_shift=30, spa_get_slop_space=128MiB spa_slop_shift=31, spa_get_slop_space=128MiB spa_slop_shift=32, spa_get_slop_space=128MiB Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: loli10K <ezomori.nozomu@gmail.com> Closes #7876 Closes #7900
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@ -2553,6 +2553,26 @@ param_set_deadman_synctime(const char *val, zfs_kernel_param_t *kp)
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return (0);
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return (0);
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}
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}
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static int
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param_set_slop_shift(const char *buf, zfs_kernel_param_t *kp)
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{
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unsigned long val;
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int error;
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error = kstrtoul(buf, 0, &val);
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if (error)
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return (SET_ERROR(error));
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if (val < 1 || val > 31)
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return (SET_ERROR(-EINVAL));
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error = param_set_int(buf, kp);
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if (error < 0)
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return (SET_ERROR(error));
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return (0);
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}
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/* Namespace manipulation */
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/* Namespace manipulation */
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EXPORT_SYMBOL(spa_lookup);
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EXPORT_SYMBOL(spa_lookup);
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EXPORT_SYMBOL(spa_add);
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EXPORT_SYMBOL(spa_add);
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@ -2678,7 +2698,8 @@ module_param(spa_asize_inflation, int, 0644);
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MODULE_PARM_DESC(spa_asize_inflation,
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MODULE_PARM_DESC(spa_asize_inflation,
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"SPA size estimate multiplication factor");
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"SPA size estimate multiplication factor");
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module_param(spa_slop_shift, int, 0644);
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module_param_call(spa_slop_shift, param_set_slop_shift, param_get_int,
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&spa_slop_shift, 0644);
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MODULE_PARM_DESC(spa_slop_shift, "Reserved free space in pool");
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MODULE_PARM_DESC(spa_slop_shift, "Reserved free space in pool");
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module_param(zfs_ddt_data_is_special, int, 0644);
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module_param(zfs_ddt_data_is_special, int, 0644);
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