dm-table.c (c6380ecd8e9bee7aba3d9a5a94b58168244c4a61) dm-table.c (8b904b5b6b58b9a29dcf3f82d936d9e7fd69fda6)
1/*
2 * Copyright (C) 2001 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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1856 bool wc = false, fua = false;
1857
1858 /*
1859 * Copy table's limits to the DM device's request_queue
1860 */
1861 q->limits = *limits;
1862
1863 if (!dm_table_supports_discards(t)) {
1/*
2 * Copyright (C) 2001 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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1856 bool wc = false, fua = false;
1857
1858 /*
1859 * Copy table's limits to the DM device's request_queue
1860 */
1861 q->limits = *limits;
1862
1863 if (!dm_table_supports_discards(t)) {
1864 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
1864 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
1865 /* Must also clear discard limits... */
1866 q->limits.max_discard_sectors = 0;
1867 q->limits.max_hw_discard_sectors = 0;
1868 q->limits.discard_granularity = 0;
1869 q->limits.discard_alignment = 0;
1870 q->limits.discard_misaligned = 0;
1871 } else
1865 /* Must also clear discard limits... */
1866 q->limits.max_discard_sectors = 0;
1867 q->limits.max_hw_discard_sectors = 0;
1868 q->limits.discard_granularity = 0;
1869 q->limits.discard_alignment = 0;
1870 q->limits.discard_misaligned = 0;
1871 } else
1872 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1872 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
1873
1874 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
1875 wc = true;
1876 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
1877 fua = true;
1878 }
1879 blk_queue_write_cache(q, wc, fua);
1880
1881 if (dm_table_supports_dax(t))
1873
1874 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
1875 wc = true;
1876 if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA)))
1877 fua = true;
1878 }
1879 blk_queue_write_cache(q, wc, fua);
1880
1881 if (dm_table_supports_dax(t))
1882 queue_flag_set_unlocked(QUEUE_FLAG_DAX, q);
1882 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
1883 if (dm_table_supports_dax_write_cache(t))
1884 dax_write_cache(t->md->dax_dev, true);
1885
1886 /* Ensure that all underlying devices are non-rotational. */
1887 if (dm_table_all_devices_attribute(t, device_is_nonrot))
1883 if (dm_table_supports_dax_write_cache(t))
1884 dax_write_cache(t->md->dax_dev, true);
1885
1886 /* Ensure that all underlying devices are non-rotational. */
1887 if (dm_table_all_devices_attribute(t, device_is_nonrot))
1888 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
1888 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
1889 else
1889 else
1890 queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
1890 blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
1891
1892 if (!dm_table_supports_write_same(t))
1893 q->limits.max_write_same_sectors = 0;
1894 if (!dm_table_supports_write_zeroes(t))
1895 q->limits.max_write_zeroes_sectors = 0;
1896
1897 if (dm_table_all_devices_attribute(t, queue_supports_sg_merge))
1891
1892 if (!dm_table_supports_write_same(t))
1893 q->limits.max_write_same_sectors = 0;
1894 if (!dm_table_supports_write_zeroes(t))
1895 q->limits.max_write_zeroes_sectors = 0;
1896
1897 if (dm_table_all_devices_attribute(t, queue_supports_sg_merge))
1898 queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
1898 blk_queue_flag_clear(QUEUE_FLAG_NO_SG_MERGE, q);
1899 else
1899 else
1900 queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
1900 blk_queue_flag_set(QUEUE_FLAG_NO_SG_MERGE, q);
1901
1902 dm_table_verify_integrity(t);
1903
1904 /*
1905 * Determine whether or not this queue's I/O timings contribute
1906 * to the entropy pool, Only request-based targets use this.
1907 * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
1908 * have it set.
1909 */
1910 if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
1901
1902 dm_table_verify_integrity(t);
1903
1904 /*
1905 * Determine whether or not this queue's I/O timings contribute
1906 * to the entropy pool, Only request-based targets use this.
1907 * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not
1908 * have it set.
1909 */
1910 if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
1911 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
1911 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
1912}
1913
1914unsigned int dm_table_get_num_targets(struct dm_table *t)
1915{
1916 return t->num_targets;
1917}
1918
1919struct list_head *dm_table_get_devices(struct dm_table *t)

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1913
1914unsigned int dm_table_get_num_targets(struct dm_table *t)
1915{
1916 return t->num_targets;
1917}
1918
1919struct list_head *dm_table_get_devices(struct dm_table *t)

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