btrfs-progs: fi resize: warn if new size is < 256M
The lower kernel limit is 256M otherwise it's considered an invalid parameter. Issue: #875 Signed-off-by: David Sterba <dsterba@suse.com>
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@ -269,6 +269,11 @@ resize [options] [<devid>:][+/-]<size>[kKmMgGtTpPeE]|[<devid>:]max <path>
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take a long time if there are data in the device area that's beyond the new
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take a long time if there are data in the device area that's beyond the new
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end. Relocation of the data takes time.
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end. Relocation of the data takes time.
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Note that there's a lower limit on the new size (either specified
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as an absolute size or difference) that is checked by kernel and
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rejected eventually as invalid. Lower values will print a warning but
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still pass the request to kernel. The currently known value is 256MiB.
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See also section *EXAMPLES*.
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See also section *EXAMPLES*.
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``Options``
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``Options``
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@ -1408,6 +1408,9 @@ static int check_resize_args(const char *amount, const char *path, u64 *devid_re
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di_args[dev_idx].path,
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di_args[dev_idx].path,
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pretty_size_mode(di_args[dev_idx].total_bytes, UNITS_DEFAULT),
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pretty_size_mode(di_args[dev_idx].total_bytes, UNITS_DEFAULT),
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res_str);
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res_str);
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if (new_size < 256 * SZ_1M)
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warning("the new size %lld (%s) is < 256MiB, this may be rejected by kernel",
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new_size, pretty_size_mode(new_size, UNITS_DEFAULT));
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out:
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out:
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free(di_args);
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free(di_args);
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