^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * (C) 2001 Clemson University and The University of Chicago
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * See COPYING in top-level directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include "protocol.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "orangefs-kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include "orangefs-bufmap.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) struct slot_map {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) int c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) wait_queue_head_t q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) int count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) unsigned long *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct slot_map rw_map = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) .c = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) .q = __WAIT_QUEUE_HEAD_INITIALIZER(rw_map.q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct slot_map readdir_map = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) .c = -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) .q = __WAIT_QUEUE_HEAD_INITIALIZER(readdir_map.q)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static void install(struct slot_map *m, int count, unsigned long *map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) m->c = m->count = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) m->map = map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) wake_up_all_locked(&m->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static void mark_killed(struct slot_map *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) m->c -= m->count + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static void run_down(struct slot_map *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) DEFINE_WAIT(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (m->c != -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (likely(list_empty(&wait.entry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) __add_wait_queue_entry_tail(&m->q, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) set_current_state(TASK_UNINTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (m->c == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) __remove_wait_queue(&m->q, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) __set_current_state(TASK_RUNNING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) m->map = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void put(struct slot_map *m, int slot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) __clear_bit(slot, m->map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) v = ++m->c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (v > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) wake_up_locked(&m->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (unlikely(v == -1)) /* finished dying */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) wake_up_all_locked(&m->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int wait_for_free(struct slot_map *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) long left = slot_timeout_secs * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) DEFINE_WAIT(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) long n = left, t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (likely(list_empty(&wait.entry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) __add_wait_queue_entry_tail_exclusive(&m->q, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) set_current_state(TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (m->c > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (m->c < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /* we are waiting for map to be installed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* it would better be there soon, or we go away */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (n > ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) n = ORANGEFS_BUFMAP_WAIT_TIMEOUT_SECS * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) t = schedule_timeout(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (unlikely(!t) && n != left && m->c < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) left = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) left = t + (left - n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (signal_pending(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) left = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) } while (left > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (!list_empty(&wait.entry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) list_del(&wait.entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) else if (left <= 0 && waitqueue_active(&m->q))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) __wake_up_locked_key(&m->q, TASK_INTERRUPTIBLE, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) __set_current_state(TASK_RUNNING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (likely(left > 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return left < 0 ? -EINTR : -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int get(struct slot_map *m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) spin_lock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (unlikely(m->c <= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) res = wait_for_free(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (likely(!res)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) m->c--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) res = find_first_zero_bit(m->map, m->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) __set_bit(res, m->map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) spin_unlock(&m->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /* used to describe mapped buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct orangefs_bufmap_desc {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) void __user *uaddr; /* user space address pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct page **page_array; /* array of mapped pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int array_count; /* size of above arrays */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct list_head list_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static struct orangefs_bufmap {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int desc_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int desc_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) int total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int page_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct page **page_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct orangefs_bufmap_desc *desc_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* array to track usage of buffer descriptors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsigned long *buffer_index_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /* array to track usage of buffer descriptors for readdir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) #define N DIV_ROUND_UP(ORANGEFS_READDIR_DEFAULT_DESC_COUNT, BITS_PER_LONG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsigned long readdir_index_array[N];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) #undef N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) } *__orangefs_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static DEFINE_SPINLOCK(orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) orangefs_bufmap_unmap(struct orangefs_bufmap *bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) unpin_user_pages(bufmap->page_array, bufmap->page_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) orangefs_bufmap_free(struct orangefs_bufmap *bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) kfree(bufmap->page_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) kfree(bufmap->desc_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) bitmap_free(bufmap->buffer_index_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) kfree(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * XXX: Can the size and shift change while the caller gives up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * XXX: lock between calling this and doing something useful?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int orangefs_bufmap_size_query(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct orangefs_bufmap *bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) int size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) spin_lock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) bufmap = __orangefs_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) size = bufmap->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) spin_unlock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int orangefs_bufmap_shift_query(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct orangefs_bufmap *bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) int shift = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) spin_lock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) bufmap = __orangefs_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) shift = bufmap->desc_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) spin_unlock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static DECLARE_WAIT_QUEUE_HEAD(bufmap_waitq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static DECLARE_WAIT_QUEUE_HEAD(readdir_waitq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static struct orangefs_bufmap *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) orangefs_bufmap_alloc(struct ORANGEFS_dev_map_desc *user_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct orangefs_bufmap *bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) bufmap = kzalloc(sizeof(*bufmap), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (!bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) bufmap->total_size = user_desc->total_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) bufmap->desc_count = user_desc->count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) bufmap->desc_size = user_desc->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) bufmap->desc_shift = ilog2(bufmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) bufmap->buffer_index_array = bitmap_zalloc(bufmap->desc_count, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (!bufmap->buffer_index_array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) goto out_free_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) bufmap->desc_array =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) kcalloc(bufmap->desc_count, sizeof(struct orangefs_bufmap_desc),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!bufmap->desc_array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) goto out_free_index_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) bufmap->page_count = bufmap->total_size / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /* allocate storage to track our page mappings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) bufmap->page_array =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) kcalloc(bufmap->page_count, sizeof(struct page *), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!bufmap->page_array)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) goto out_free_desc_array;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) out_free_desc_array:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) kfree(bufmap->desc_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) out_free_index_array:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) bitmap_free(bufmap->buffer_index_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) out_free_bufmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) kfree(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) orangefs_bufmap_map(struct orangefs_bufmap *bufmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct ORANGEFS_dev_map_desc *user_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int pages_per_desc = bufmap->desc_size / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) int offset = 0, ret, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* map the pages */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) ret = pin_user_pages_fast((unsigned long)user_desc->ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) bufmap->page_count, FOLL_WRITE, bufmap->page_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (ret != bufmap->page_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) gossip_err("orangefs error: asked for %d pages, only got %d.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) bufmap->page_count, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) for (i = 0; i < ret; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) SetPageError(bufmap->page_array[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) unpin_user_page(bufmap->page_array[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * ideally we want to get kernel space pointers for each page, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * we can't kmap that many pages at once if highmem is being used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * so instead, we just kmap/kunmap the page address each time the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * kaddr is needed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) for (i = 0; i < bufmap->page_count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) flush_dcache_page(bufmap->page_array[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /* build a list of available descriptors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) for (offset = 0, i = 0; i < bufmap->desc_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) bufmap->desc_array[i].page_array = &bufmap->page_array[offset];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) bufmap->desc_array[i].array_count = pages_per_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) bufmap->desc_array[i].uaddr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) (user_desc->ptr + (i * pages_per_desc * PAGE_SIZE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) offset += pages_per_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * orangefs_bufmap_initialize()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * initializes the mapped buffer interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * returns 0 on success, -errno on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) int orangefs_bufmap_initialize(struct ORANGEFS_dev_map_desc *user_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct orangefs_bufmap *bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) gossip_debug(GOSSIP_BUFMAP_DEBUG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) "orangefs_bufmap_initialize: called (ptr ("
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) "%p) sz (%d) cnt(%d).\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) user_desc->ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) user_desc->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) user_desc->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (user_desc->total_size < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) user_desc->size < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) user_desc->count < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * sanity check alignment and size of buffer that caller wants to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * work with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (PAGE_ALIGN((unsigned long)user_desc->ptr) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) (unsigned long)user_desc->ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) gossip_err("orangefs error: memory alignment (front). %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) user_desc->ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (PAGE_ALIGN(((unsigned long)user_desc->ptr + user_desc->total_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) != (unsigned long)(user_desc->ptr + user_desc->total_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) gossip_err("orangefs error: memory alignment (back).(%p + %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) user_desc->ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) user_desc->total_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (user_desc->total_size != (user_desc->size * user_desc->count)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) gossip_err("orangefs error: user provided an oddly sized buffer: (%d, %d, %d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) user_desc->total_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) user_desc->size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) user_desc->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if ((user_desc->size % PAGE_SIZE) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) gossip_err("orangefs error: bufmap size not page size divisible (%d).\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) user_desc->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) bufmap = orangefs_bufmap_alloc(user_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (!bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) ret = orangefs_bufmap_map(bufmap, user_desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) goto out_free_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) spin_lock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (__orangefs_bufmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) spin_unlock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) gossip_err("orangefs: error: bufmap already initialized.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) goto out_unmap_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) __orangefs_bufmap = bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) install(&rw_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) bufmap->desc_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) bufmap->buffer_index_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) install(&readdir_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) ORANGEFS_READDIR_DEFAULT_DESC_COUNT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) bufmap->readdir_index_array);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) spin_unlock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) gossip_debug(GOSSIP_BUFMAP_DEBUG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) "orangefs_bufmap_initialize: exiting normally\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) out_unmap_bufmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) orangefs_bufmap_unmap(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) out_free_bufmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) orangefs_bufmap_free(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * orangefs_bufmap_finalize()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * shuts down the mapped buffer interface and releases any resources
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * associated with it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * no return value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) void orangefs_bufmap_finalize(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct orangefs_bufmap *bufmap = __orangefs_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (!bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) gossip_debug(GOSSIP_BUFMAP_DEBUG, "orangefs_bufmap_finalize: called\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) mark_killed(&rw_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) mark_killed(&readdir_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) gossip_debug(GOSSIP_BUFMAP_DEBUG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) "orangefs_bufmap_finalize: exiting normally\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) void orangefs_bufmap_run_down(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) struct orangefs_bufmap *bufmap = __orangefs_bufmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (!bufmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) run_down(&rw_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) run_down(&readdir_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) spin_lock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) __orangefs_bufmap = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) spin_unlock(&orangefs_bufmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) orangefs_bufmap_unmap(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) orangefs_bufmap_free(bufmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * orangefs_bufmap_get()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * gets a free mapped buffer descriptor, will sleep until one becomes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * available if necessary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * returns slot on success, -errno on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) int orangefs_bufmap_get(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return get(&rw_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * orangefs_bufmap_put()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * returns a mapped buffer descriptor to the collection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * no return value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) void orangefs_bufmap_put(int buffer_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) put(&rw_map, buffer_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * orangefs_readdir_index_get()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) * gets a free descriptor, will sleep until one becomes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) * available if necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) * Although the readdir buffers are not mapped into kernel space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * we could do that at a later point of time. Regardless, these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * indices are used by the client-core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * returns slot on success, -errno on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) int orangefs_readdir_index_get(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return get(&readdir_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) void orangefs_readdir_index_put(int buffer_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) put(&readdir_map, buffer_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * we've been handed an iovec, we need to copy it to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * the shared memory descriptor at "buffer_index".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) int orangefs_bufmap_copy_from_iovec(struct iov_iter *iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) int buffer_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct orangefs_bufmap_desc *to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) gossip_debug(GOSSIP_BUFMAP_DEBUG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) "%s: buffer_index:%d: size:%zu:\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) __func__, buffer_index, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) to = &__orangefs_bufmap->desc_array[buffer_index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) for (i = 0; size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) struct page *page = to->page_array[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) size_t n = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) if (n > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) n = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (copy_page_from_iter(page, 0, n, iter) != n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) size -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) * we've been handed an iovec, we need to fill it from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) * the shared memory descriptor at "buffer_index".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) int orangefs_bufmap_copy_to_iovec(struct iov_iter *iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int buffer_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) struct orangefs_bufmap_desc *from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) from = &__orangefs_bufmap->desc_array[buffer_index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) gossip_debug(GOSSIP_BUFMAP_DEBUG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) "%s: buffer_index:%d: size:%zu:\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) __func__, buffer_index, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) for (i = 0; size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) struct page *page = from->page_array[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) size_t n = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) if (n > PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) n = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) n = copy_page_to_iter(page, 0, n, iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (!n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) size -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) void orangefs_bufmap_page_fill(void *page_to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) int buffer_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) int slot_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) struct orangefs_bufmap_desc *from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) void *page_from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) from = &__orangefs_bufmap->desc_array[buffer_index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) page_from = kmap_atomic(from->page_array[slot_index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) memcpy(page_to, page_from, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) kunmap_atomic(page_from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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