^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) * virtio-fs: Virtio Filesystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2018 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/dax.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/pfn_t.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/virtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/virtio_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fs_context.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/fs_parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/uio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "fuse_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /* List of virtio-fs device instances and a lock for the list. Also provides
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * mutual exclusion in device removal and mounting path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static DEFINE_MUTEX(virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static LIST_HEAD(virtio_fs_instances);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) VQ_HIPRIO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) VQ_REQUEST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define VQ_NAME_LEN 24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Per-virtqueue state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct virtio_fs_vq {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct virtqueue *vq; /* protected by ->lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct work_struct done_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct list_head queued_reqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct list_head end_reqs; /* End these requests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct delayed_work dispatch_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct fuse_dev *fud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) bool connected;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) long in_flight;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct completion in_flight_zero; /* No inflight requests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) char name[VQ_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) } ____cacheline_aligned_in_smp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* A virtio-fs device instance */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct virtio_fs {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct kref refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct list_head list; /* on virtio_fs_instances */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) char *tag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct virtio_fs_vq *vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) unsigned int nvqs; /* number of virtqueues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned int num_request_queues; /* number of request queues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct dax_device *dax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* DAX memory window where file contents are mapped */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) void *window_kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) phys_addr_t window_phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) size_t window_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct virtio_fs_forget_req {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct fuse_in_header ih;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct fuse_forget_in arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct virtio_fs_forget {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* This request can be temporarily queued on virt queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct virtio_fs_forget_req req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct virtio_fs_req_work {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct fuse_req *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct work_struct done_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct fuse_req *req, bool in_flight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) OPT_DAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static const struct fs_parameter_spec virtio_fs_parameters[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) fsparam_flag("dax", OPT_DAX),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static int virtio_fs_parse_param(struct fs_context *fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct fs_parameter *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct fs_parse_result result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct fuse_fs_context *ctx = fc->fs_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) opt = fs_parse(fc, virtio_fs_parameters, param, &result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (opt < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) switch (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) case OPT_DAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ctx->dax = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static void virtio_fs_free_fc(struct fs_context *fc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct fuse_fs_context *ctx = fc->fs_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) kfree(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct virtio_fs *fs = vq->vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return &fs->vqs[vq->index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static inline struct fuse_pqueue *vq_to_fpq(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return &vq_to_fsvq(vq)->fud->pq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* Should be called with fsvq->lock held. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static inline void inc_in_flight_req(struct virtio_fs_vq *fsvq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) fsvq->in_flight++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Should be called with fsvq->lock held. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static inline void dec_in_flight_req(struct virtio_fs_vq *fsvq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) WARN_ON(fsvq->in_flight <= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) fsvq->in_flight--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (!fsvq->in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) complete(&fsvq->in_flight_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static void release_virtio_fs_obj(struct kref *ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) struct virtio_fs *vfs = container_of(ref, struct virtio_fs, refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) kfree(vfs->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) kfree(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Make sure virtiofs_mutex is held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static void virtio_fs_put(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) kref_put(&fs->refcount, release_virtio_fs_obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static void virtio_fs_fiq_release(struct fuse_iqueue *fiq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct virtio_fs *vfs = fiq->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) virtio_fs_put(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static void virtio_fs_drain_queue(struct virtio_fs_vq *fsvq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) WARN_ON(fsvq->in_flight < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /* Wait for in flight requests to finish.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) if (fsvq->in_flight) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /* We are holding virtio_fs_mutex. There should not be any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * waiters waiting for completion.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) reinit_completion(&fsvq->in_flight_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) wait_for_completion(&fsvq->in_flight_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) flush_work(&fsvq->done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) flush_delayed_work(&fsvq->dispatch_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static void virtio_fs_drain_all_queues_locked(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) virtio_fs_drain_queue(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static void virtio_fs_drain_all_queues(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /* Provides mutual exclusion between ->remove and ->kill_sb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * paths. We don't want both of these draining queue at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * same time. Current completion logic reinits completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * and that means there should not be any other thread
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * doing reinit or waiting for completion already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) virtio_fs_drain_all_queues_locked(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static void virtio_fs_start_all_queues(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) fsvq->connected = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* Add a new instance to the list or return -EEXIST if tag name exists*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int virtio_fs_add_instance(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct virtio_fs *fs2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) bool duplicate = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) list_for_each_entry(fs2, &virtio_fs_instances, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (strcmp(fs->tag, fs2->tag) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) duplicate = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!duplicate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) list_add_tail(&fs->list, &virtio_fs_instances);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (duplicate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* Return the virtio_fs with a given tag, or NULL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static struct virtio_fs *virtio_fs_find_instance(const char *tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct virtio_fs *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) list_for_each_entry(fs, &virtio_fs_instances, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (strcmp(fs->tag, tag) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) kref_get(&fs->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) fs = NULL; /* not found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static void virtio_fs_free_devs(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct virtio_fs_vq *fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (!fsvq->fud)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) fuse_dev_free(fsvq->fud);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) fsvq->fud = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /* Read filesystem name from virtio config into fs->tag (must kfree()). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int virtio_fs_read_tag(struct virtio_device *vdev, struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) char tag_buf[sizeof_field(struct virtio_fs_config, tag)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) char *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) virtio_cread_bytes(vdev, offsetof(struct virtio_fs_config, tag),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) &tag_buf, sizeof(tag_buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) end = memchr(tag_buf, '\0', sizeof(tag_buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (end == tag_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return -EINVAL; /* empty tag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (!end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) end = &tag_buf[sizeof(tag_buf)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) len = end - tag_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) fs->tag = devm_kmalloc(&vdev->dev, len + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if (!fs->tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) memcpy(fs->tag, tag_buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) fs->tag[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /* Work function for hiprio completion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static void virtio_fs_hiprio_done_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct virtqueue *vq = fsvq->vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* Free completed FUSE_FORGET requests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) void *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) virtqueue_disable_cb(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) while ((req = virtqueue_get_buf(vq, &len)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) kfree(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) dec_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) } while (!virtqueue_enable_cb(vq) && likely(!virtqueue_is_broken(vq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) static void virtio_fs_request_dispatch_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct fuse_req *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) dispatch_work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) pr_debug("virtio-fs: worker %s called.\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) req = list_first_entry_or_null(&fsvq->end_reqs, struct fuse_req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (!req) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) list_del_init(&req->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) fuse_request_end(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /* Dispatch pending requests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) req = list_first_entry_or_null(&fsvq->queued_reqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct fuse_req, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (!req) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) list_del_init(&req->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) ret = virtio_fs_enqueue_req(fsvq, req, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (ret == -ENOMEM || ret == -ENOSPC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) list_add_tail(&req->list, &fsvq->queued_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) schedule_delayed_work(&fsvq->dispatch_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) msecs_to_jiffies(1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) req->out.h.error = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) dec_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) fuse_request_end(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * Returns 1 if queue is full and sender should wait a bit before sending
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * next request, 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static int send_forget_request(struct virtio_fs_vq *fsvq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) struct virtio_fs_forget *forget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) bool in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct scatterlist sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) struct virtqueue *vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) bool notify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct virtio_fs_forget_req *req = &forget->req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (!fsvq->connected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dec_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) kfree(forget);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) sg_init_one(&sg, req, sizeof(*req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) vq = fsvq->vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) dev_dbg(&vq->vdev->dev, "%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) ret = virtqueue_add_outbuf(vq, &sg, 1, forget, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (ret == -ENOMEM || ret == -ENOSPC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) list_add_tail(&forget->list, &fsvq->queued_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) schedule_delayed_work(&fsvq->dispatch_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) msecs_to_jiffies(1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (!in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) inc_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) /* Queue is full */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) kfree(forget);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) dec_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (!in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) inc_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) notify = virtqueue_kick_prepare(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) virtqueue_notify(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) static void virtio_fs_hiprio_dispatch_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) struct virtio_fs_forget *forget;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) dispatch_work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) pr_debug("virtio-fs: worker %s called.\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) forget = list_first_entry_or_null(&fsvq->queued_reqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct virtio_fs_forget, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (!forget) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) list_del(&forget->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (send_forget_request(fsvq, forget, true))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) return;
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) /* Allocate and copy args into req->argbuf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static int copy_args_to_argbuf(struct fuse_req *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct fuse_args *args = req->args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) unsigned int offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) unsigned int num_in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) unsigned int num_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) num_in = args->in_numargs - args->in_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) num_out = args->out_numargs - args->out_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) len = fuse_len_args(num_in, (struct fuse_arg *) args->in_args) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) fuse_len_args(num_out, args->out_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) req->argbuf = kmalloc(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (!req->argbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) for (i = 0; i < num_in; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) memcpy(req->argbuf + offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) args->in_args[i].value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) args->in_args[i].size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) offset += args->in_args[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) /* Copy args out of and free req->argbuf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) static void copy_args_from_argbuf(struct fuse_args *args, struct fuse_req *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) unsigned int remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) unsigned int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) unsigned int num_in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) unsigned int num_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) remaining = req->out.h.len - sizeof(req->out.h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) num_in = args->in_numargs - args->in_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) num_out = args->out_numargs - args->out_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) offset = fuse_len_args(num_in, (struct fuse_arg *)args->in_args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) for (i = 0; i < num_out; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) unsigned int argsize = args->out_args[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (args->out_argvar &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) i == args->out_numargs - 1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) argsize > remaining) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) argsize = remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) memcpy(args->out_args[i].value, req->argbuf + offset, argsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) offset += argsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if (i != args->out_numargs - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) remaining -= argsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) /* Store the actual size of the variable-length arg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (args->out_argvar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) args->out_args[args->out_numargs - 1].size = remaining;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) kfree(req->argbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) req->argbuf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /* Work function for request completion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) static void virtio_fs_request_complete(struct fuse_req *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) struct virtio_fs_vq *fsvq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) struct fuse_pqueue *fpq = &fsvq->fud->pq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) struct fuse_args *args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) struct fuse_args_pages *ap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) unsigned int len, i, thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) * TODO verify that server properly follows FUSE protocol
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) * (oh.uniq, oh.len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) args = req->args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) copy_args_from_argbuf(args, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (args->out_pages && args->page_zeroing) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) len = args->out_args[args->out_numargs - 1].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ap = container_of(args, typeof(*ap), args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) for (i = 0; i < ap->num_pages; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) thislen = ap->descs[i].length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (len < thislen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) WARN_ON(ap->descs[i].offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) page = ap->pages[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) zero_user_segment(page, len, thislen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) len -= thislen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) spin_lock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) clear_bit(FR_SENT, &req->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) spin_unlock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) fuse_request_end(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) dec_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) static void virtio_fs_complete_req_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct virtio_fs_req_work *w =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) container_of(work, typeof(*w), done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) virtio_fs_request_complete(w->req, w->fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) kfree(w);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) static void virtio_fs_requests_done_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) struct fuse_pqueue *fpq = &fsvq->fud->pq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct virtqueue *vq = fsvq->vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct fuse_req *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct fuse_req *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) LIST_HEAD(reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) /* Collect completed requests off the virtqueue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) virtqueue_disable_cb(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) while ((req = virtqueue_get_buf(vq, &len)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) spin_lock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) list_move_tail(&req->list, &reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) spin_unlock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) } while (!virtqueue_enable_cb(vq) && likely(!virtqueue_is_broken(vq)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) /* End requests */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) list_for_each_entry_safe(req, next, &reqs, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) list_del_init(&req->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) /* blocking async request completes in a worker context */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (req->args->may_block) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) struct virtio_fs_req_work *w;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) w = kzalloc(sizeof(*w), GFP_NOFS | __GFP_NOFAIL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) INIT_WORK(&w->done_work, virtio_fs_complete_req_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) w->fsvq = fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) w->req = req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) schedule_work(&w->done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) virtio_fs_request_complete(req, fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) /* Virtqueue interrupt handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) static void virtio_fs_vq_done(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) struct virtio_fs_vq *fsvq = vq_to_fsvq(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) dev_dbg(&vq->vdev->dev, "%s %s\n", __func__, fsvq->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) schedule_work(&fsvq->done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) static void virtio_fs_init_vq(struct virtio_fs_vq *fsvq, char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) int vq_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) strncpy(fsvq->name, name, VQ_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) spin_lock_init(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) INIT_LIST_HEAD(&fsvq->queued_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) INIT_LIST_HEAD(&fsvq->end_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) init_completion(&fsvq->in_flight_zero);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (vq_type == VQ_REQUEST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) INIT_WORK(&fsvq->done_work, virtio_fs_requests_done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) INIT_DELAYED_WORK(&fsvq->dispatch_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) virtio_fs_request_dispatch_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) INIT_WORK(&fsvq->done_work, virtio_fs_hiprio_done_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) INIT_DELAYED_WORK(&fsvq->dispatch_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) virtio_fs_hiprio_dispatch_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) /* Initialize virtqueues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) static int virtio_fs_setup_vqs(struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct virtqueue **vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) vq_callback_t **callbacks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) const char **names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) virtio_cread_le(vdev, struct virtio_fs_config, num_request_queues,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) &fs->num_request_queues);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (fs->num_request_queues == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) fs->nvqs = VQ_REQUEST + fs->num_request_queues;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) fs->vqs = kcalloc(fs->nvqs, sizeof(fs->vqs[VQ_HIPRIO]), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) if (!fs->vqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) vqs = kmalloc_array(fs->nvqs, sizeof(vqs[VQ_HIPRIO]), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) callbacks = kmalloc_array(fs->nvqs, sizeof(callbacks[VQ_HIPRIO]),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) names = kmalloc_array(fs->nvqs, sizeof(names[VQ_HIPRIO]), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) if (!vqs || !callbacks || !names) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) /* Initialize the hiprio/forget request virtqueue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) callbacks[VQ_HIPRIO] = virtio_fs_vq_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) virtio_fs_init_vq(&fs->vqs[VQ_HIPRIO], "hiprio", VQ_HIPRIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) names[VQ_HIPRIO] = fs->vqs[VQ_HIPRIO].name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) /* Initialize the requests virtqueues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) for (i = VQ_REQUEST; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) char vq_name[VQ_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) snprintf(vq_name, VQ_NAME_LEN, "requests.%u", i - VQ_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) virtio_fs_init_vq(&fs->vqs[i], vq_name, VQ_REQUEST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) callbacks[i] = virtio_fs_vq_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) names[i] = fs->vqs[i].name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) ret = virtio_find_vqs(vdev, fs->nvqs, vqs, callbacks, names, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) for (i = 0; i < fs->nvqs; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) fs->vqs[i].vq = vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) virtio_fs_start_all_queues(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) kfree(names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) kfree(callbacks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) kfree(vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) kfree(fs->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) /* Free virtqueues (device must already be reset) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) static void virtio_fs_cleanup_vqs(struct virtio_device *vdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) vdev->config->del_vqs(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) /* Map a window offset to a page frame number. The window offset will have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) * been produced by .iomap_begin(), which maps a file offset to a window
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) long nr_pages, void **kaddr, pfn_t *pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) struct virtio_fs *fs = dax_get_private(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) phys_addr_t offset = PFN_PHYS(pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (kaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) *kaddr = fs->window_kaddr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) *pfn = phys_to_pfn_t(fs->window_phys_addr + offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) PFN_DEV | PFN_MAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) return nr_pages > max_nr_pages ? max_nr_pages : nr_pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) static size_t virtio_fs_copy_from_iter(struct dax_device *dax_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) pgoff_t pgoff, void *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) size_t bytes, struct iov_iter *i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) return copy_from_iter(addr, bytes, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) static size_t virtio_fs_copy_to_iter(struct dax_device *dax_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) pgoff_t pgoff, void *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) size_t bytes, struct iov_iter *i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) return copy_to_iter(addr, bytes, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) static int virtio_fs_zero_page_range(struct dax_device *dax_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) pgoff_t pgoff, size_t nr_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) long rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) void *kaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) memset(kaddr, 0, nr_pages << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) static const struct dax_operations virtio_fs_dax_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) .direct_access = virtio_fs_direct_access,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) .copy_from_iter = virtio_fs_copy_from_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) .copy_to_iter = virtio_fs_copy_to_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) .zero_page_range = virtio_fs_zero_page_range,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) static void virtio_fs_cleanup_dax(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) struct dax_device *dax_dev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) kill_dax(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) put_dax(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) struct virtio_shm_region cache_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) struct dev_pagemap *pgmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) bool have_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) if (!IS_ENABLED(CONFIG_FUSE_DAX))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) /* Get cache region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) have_cache = virtio_get_shm_region(vdev, &cache_reg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) (u8)VIRTIO_FS_SHMCAP_ID_CACHE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) if (!have_cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) dev_notice(&vdev->dev, "%s: No cache capability\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) if (!devm_request_mem_region(&vdev->dev, cache_reg.addr, cache_reg.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) dev_name(&vdev->dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) dev_warn(&vdev->dev, "could not reserve region addr=0x%llx len=0x%llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) cache_reg.addr, cache_reg.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) dev_notice(&vdev->dev, "Cache len: 0x%llx @ 0x%llx\n", cache_reg.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) cache_reg.addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) pgmap = devm_kzalloc(&vdev->dev, sizeof(*pgmap), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) if (!pgmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) pgmap->type = MEMORY_DEVICE_FS_DAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) /* Ideally we would directly use the PCI BAR resource but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) * devm_memremap_pages() wants its own copy in pgmap. So
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * initialize a struct resource from scratch (only the start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * and end fields will be used).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) pgmap->range = (struct range) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) .start = (phys_addr_t) cache_reg.addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) .end = (phys_addr_t) cache_reg.addr + cache_reg.len - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) pgmap->nr_range = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) fs->window_kaddr = devm_memremap_pages(&vdev->dev, pgmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) if (IS_ERR(fs->window_kaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return PTR_ERR(fs->window_kaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) fs->window_phys_addr = (phys_addr_t) cache_reg.addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) fs->window_len = (phys_addr_t) cache_reg.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) fs->dax_dev = alloc_dax(fs, NULL, &virtio_fs_dax_ops, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) if (IS_ERR(fs->dax_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return PTR_ERR(fs->dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) fs->dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) static int virtio_fs_probe(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) struct virtio_fs *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) fs = kzalloc(sizeof(*fs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (!fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) kref_init(&fs->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) vdev->priv = fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) ret = virtio_fs_read_tag(vdev, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) ret = virtio_fs_setup_vqs(vdev, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) /* TODO vq affinity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) ret = virtio_fs_setup_dax(vdev, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) goto out_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) /* Bring the device online in case the filesystem is mounted and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) * requests need to be sent before we return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) virtio_device_ready(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) ret = virtio_fs_add_instance(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) goto out_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) out_vqs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) vdev->config->reset(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) virtio_fs_cleanup_vqs(vdev, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) kfree(fs->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) vdev->priv = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) kfree(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) static void virtio_fs_stop_all_queues(struct virtio_fs *fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) fsvq->connected = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) static void virtio_fs_remove(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) struct virtio_fs *fs = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) /* This device is going away. No one should get new reference */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) list_del_init(&fs->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) virtio_fs_stop_all_queues(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) virtio_fs_drain_all_queues_locked(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) vdev->config->reset(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) virtio_fs_cleanup_vqs(vdev, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) vdev->priv = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) /* Put device reference on virtio_fs object */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) virtio_fs_put(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) static int virtio_fs_freeze(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) /* TODO need to save state here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) pr_warn("virtio-fs: suspend/resume not yet supported\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) static int virtio_fs_restore(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) /* TODO need to restore state here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) #endif /* CONFIG_PM_SLEEP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) static const struct virtio_device_id id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) { VIRTIO_ID_FS, VIRTIO_DEV_ANY_ID },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) static const unsigned int feature_table[] = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) static struct virtio_driver virtio_fs_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) .driver.name = KBUILD_MODNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) .driver.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) .id_table = id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) .feature_table = feature_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) .feature_table_size = ARRAY_SIZE(feature_table),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) .probe = virtio_fs_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) .remove = virtio_fs_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) .freeze = virtio_fs_freeze,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) .restore = virtio_fs_restore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) static void virtio_fs_wake_forget_and_unlock(struct fuse_iqueue *fiq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) __releases(fiq->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) struct fuse_forget_link *link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) struct virtio_fs_forget *forget;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) struct virtio_fs_forget_req *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) struct virtio_fs *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) u64 unique;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) link = fuse_dequeue_forget(fiq, 1, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) unique = fuse_get_unique(fiq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) fs = fiq->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) fsvq = &fs->vqs[VQ_HIPRIO];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) spin_unlock(&fiq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) /* Allocate a buffer for the request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) forget = kmalloc(sizeof(*forget), GFP_NOFS | __GFP_NOFAIL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) req = &forget->req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) req->ih = (struct fuse_in_header){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) .opcode = FUSE_FORGET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) .nodeid = link->forget_one.nodeid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) .unique = unique,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) .len = sizeof(*req),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) req->arg = (struct fuse_forget_in){
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) .nlookup = link->forget_one.nlookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) send_forget_request(fsvq, forget, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) kfree(link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) static void virtio_fs_wake_interrupt_and_unlock(struct fuse_iqueue *fiq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) __releases(fiq->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) * TODO interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) * Normal fs operations on a local filesystems aren't interruptible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) * Exceptions are blocking lock operations; for example fcntl(F_SETLKW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) * with shared lock between host and guest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) spin_unlock(&fiq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) /* Count number of scatter-gather elements required */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) static unsigned int sg_count_fuse_pages(struct fuse_page_desc *page_descs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) unsigned int num_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) unsigned int total_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) unsigned int this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) for (i = 0; i < num_pages && total_len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) this_len = min(page_descs[i].length, total_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) total_len -= this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) /* Return the number of scatter-gather list elements required */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) static unsigned int sg_count_fuse_req(struct fuse_req *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) struct fuse_args *args = req->args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) struct fuse_args_pages *ap = container_of(args, typeof(*ap), args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) unsigned int size, total_sgs = 1 /* fuse_in_header */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) if (args->in_numargs - args->in_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) total_sgs += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) if (args->in_pages) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) size = args->in_args[args->in_numargs - 1].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) if (!test_bit(FR_ISREPLY, &req->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) return total_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) total_sgs += 1 /* fuse_out_header */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) if (args->out_numargs - args->out_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) total_sgs += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) if (args->out_pages) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) size = args->out_args[args->out_numargs - 1].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) return total_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) /* Add pages to scatter-gather list and return number of elements used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) static unsigned int sg_init_fuse_pages(struct scatterlist *sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) struct page **pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) struct fuse_page_desc *page_descs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) unsigned int num_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) unsigned int total_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) unsigned int this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) for (i = 0; i < num_pages && total_len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) sg_init_table(&sg[i], 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) this_len = min(page_descs[i].length, total_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) sg_set_page(&sg[i], pages[i], this_len, page_descs[i].offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) total_len -= this_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) /* Add args to scatter-gather list and return number of elements used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) static unsigned int sg_init_fuse_args(struct scatterlist *sg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) struct fuse_req *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) struct fuse_arg *args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) unsigned int numargs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) bool argpages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) void *argbuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) unsigned int *len_used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) struct fuse_args_pages *ap = container_of(req->args, typeof(*ap), args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) unsigned int total_sgs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) len = fuse_len_args(numargs - argpages, args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) sg_init_one(&sg[total_sgs++], argbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (argpages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) total_sgs += sg_init_fuse_pages(&sg[total_sgs],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) ap->pages, ap->descs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) ap->num_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) args[numargs - 1].size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) if (len_used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) *len_used = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) return total_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) /* Add a request to a virtqueue and kick the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) struct fuse_req *req, bool in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) /* requests need at least 4 elements */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) struct scatterlist *stack_sgs[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) struct scatterlist stack_sg[ARRAY_SIZE(stack_sgs)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) struct scatterlist **sgs = stack_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) struct scatterlist *sg = stack_sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) struct virtqueue *vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) struct fuse_args *args = req->args;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) unsigned int argbuf_used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) unsigned int out_sgs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) unsigned int in_sgs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) unsigned int total_sgs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) bool notify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) struct fuse_pqueue *fpq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) /* Does the sglist fit on the stack? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) total_sgs = sg_count_fuse_req(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) if (total_sgs > ARRAY_SIZE(stack_sgs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) sgs = kmalloc_array(total_sgs, sizeof(sgs[0]), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) sg = kmalloc_array(total_sgs, sizeof(sg[0]), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) if (!sgs || !sg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) /* Use a bounce buffer since stack args cannot be mapped */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) ret = copy_args_to_argbuf(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) /* Request elements */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) sg_init_one(&sg[out_sgs++], &req->in.h, sizeof(req->in.h));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) out_sgs += sg_init_fuse_args(&sg[out_sgs], req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) (struct fuse_arg *)args->in_args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) args->in_numargs, args->in_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) req->argbuf, &argbuf_used);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) /* Reply elements */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) if (test_bit(FR_ISREPLY, &req->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) sg_init_one(&sg[out_sgs + in_sgs++],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) &req->out.h, sizeof(req->out.h));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) in_sgs += sg_init_fuse_args(&sg[out_sgs + in_sgs], req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) args->out_args, args->out_numargs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) args->out_pages,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) req->argbuf + argbuf_used, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) WARN_ON(out_sgs + in_sgs != total_sgs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) for (i = 0; i < total_sgs; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) sgs[i] = &sg[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) if (!fsvq->connected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) ret = -ENOTCONN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) vq = fsvq->vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) ret = virtqueue_add_sgs(vq, sgs, out_sgs, in_sgs, req, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) /* Request successfully sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) fpq = &fsvq->fud->pq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) spin_lock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) list_add_tail(&req->list, fpq->processing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) spin_unlock(&fpq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) set_bit(FR_SENT, &req->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) /* matches barrier in request_wait_answer() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) smp_mb__after_atomic();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) if (!in_flight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) inc_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) notify = virtqueue_kick_prepare(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) if (notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) virtqueue_notify(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) if (ret < 0 && req->argbuf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) kfree(req->argbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) req->argbuf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) if (sgs != stack_sgs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) kfree(sgs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) kfree(sg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) static void virtio_fs_wake_pending_and_unlock(struct fuse_iqueue *fiq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) __releases(fiq->lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) unsigned int queue_id = VQ_REQUEST; /* TODO multiqueue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) struct virtio_fs *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) struct fuse_req *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) struct virtio_fs_vq *fsvq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) WARN_ON(list_empty(&fiq->pending));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) req = list_last_entry(&fiq->pending, struct fuse_req, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) clear_bit(FR_PENDING, &req->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) list_del_init(&req->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) WARN_ON(!list_empty(&fiq->pending));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) spin_unlock(&fiq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) fs = fiq->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) pr_debug("%s: opcode %u unique %#llx nodeid %#llx in.len %u out.len %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) __func__, req->in.h.opcode, req->in.h.unique,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) req->in.h.nodeid, req->in.h.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) fuse_len_args(req->args->out_numargs, req->args->out_args));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) fsvq = &fs->vqs[queue_id];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) ret = virtio_fs_enqueue_req(fsvq, req, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) if (ret == -ENOMEM || ret == -ENOSPC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) * Virtqueue full. Retry submission from worker
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) * context as we might be holding fc->bg_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) list_add_tail(&req->list, &fsvq->queued_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) inc_in_flight_req(fsvq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) schedule_delayed_work(&fsvq->dispatch_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) msecs_to_jiffies(1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) req->out.h.error = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) /* Can't end request in submission context. Use a worker */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) list_add_tail(&req->list, &fsvq->end_reqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) schedule_delayed_work(&fsvq->dispatch_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) static const struct fuse_iqueue_ops virtio_fs_fiq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) .wake_forget_and_unlock = virtio_fs_wake_forget_and_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) .wake_interrupt_and_unlock = virtio_fs_wake_interrupt_and_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) .wake_pending_and_unlock = virtio_fs_wake_pending_and_unlock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) .release = virtio_fs_fiq_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) static inline void virtio_fs_ctx_set_defaults(struct fuse_fs_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) ctx->rootmode = S_IFDIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) ctx->default_permissions = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) ctx->allow_other = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) ctx->max_read = UINT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) ctx->blksize = 512;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) ctx->destroy = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) ctx->no_control = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) ctx->no_force_umount = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) struct fuse_mount *fm = get_fuse_mount_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) struct fuse_conn *fc = fm->fc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) struct virtio_fs *fs = fc->iq.priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) struct fuse_fs_context *ctx = fsc->fs_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) virtio_fs_ctx_set_defaults(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) /* After holding mutex, make sure virtiofs device is still there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) * Though we are holding a reference to it, drive ->remove might
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) * still have cleaned up virtual queues. In that case bail out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) if (list_empty(&fs->list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) pr_info("virtio-fs: tag <%s> not found\n", fs->tag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) /* Allocate fuse_dev for hiprio and notification queues */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) struct virtio_fs_vq *fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) fsvq->fud = fuse_dev_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) if (!fsvq->fud)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) goto err_free_fuse_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) /* virtiofs allocates and installs its own fuse devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) ctx->fudptr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) if (ctx->dax) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) if (!fs->dax_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) pr_err("virtio-fs: dax can't be enabled as filesystem"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) " device does not support it.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) goto err_free_fuse_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) ctx->dax_dev = fs->dax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) err = fuse_fill_super_common(sb, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) goto err_free_fuse_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) for (i = 0; i < fs->nvqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) struct virtio_fs_vq *fsvq = &fs->vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) fuse_dev_install(fsvq->fud, fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) /* Previous unmount will stop all queues. Start these again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) virtio_fs_start_all_queues(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) fuse_send_init(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) err_free_fuse_devs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) virtio_fs_free_devs(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) static void virtio_fs_conn_destroy(struct fuse_mount *fm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) struct fuse_conn *fc = fm->fc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) struct virtio_fs *vfs = fc->iq.priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) struct virtio_fs_vq *fsvq = &vfs->vqs[VQ_HIPRIO];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) /* Stop dax worker. Soon evict_inodes() will be called which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) * will free all memory ranges belonging to all inodes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) if (IS_ENABLED(CONFIG_FUSE_DAX))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) fuse_dax_cancel_work(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) /* Stop forget queue. Soon destroy will be sent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) spin_lock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) fsvq->connected = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) spin_unlock(&fsvq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) virtio_fs_drain_all_queues(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) fuse_conn_destroy(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) /* fuse_conn_destroy() must have sent destroy. Stop all queues
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) * and drain one more time and free fuse devices. Freeing fuse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) * devices will drop their reference on fuse_conn and that in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) * turn will drop its reference on virtio_fs object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) virtio_fs_stop_all_queues(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) virtio_fs_drain_all_queues(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) virtio_fs_free_devs(vfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) static void virtio_kill_sb(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) struct fuse_mount *fm = get_fuse_mount_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) bool last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) /* If mount failed, we can still be called without any fc */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) if (fm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) last = fuse_mount_remove(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) if (last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) virtio_fs_conn_destroy(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) kill_anon_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) static int virtio_fs_test_super(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) struct fs_context *fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) struct fuse_mount *fsc_fm = fsc->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) struct fuse_mount *sb_fm = get_fuse_mount_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) return fsc_fm->fc->iq.priv == sb_fm->fc->iq.priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) static int virtio_fs_set_super(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) struct fs_context *fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) err = get_anon_bdev(&sb->s_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) fuse_mount_get(fsc->s_fs_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) static int virtio_fs_get_tree(struct fs_context *fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) struct virtio_fs *fs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) struct fuse_conn *fc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) struct fuse_mount *fm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) /* This gets a reference on virtio_fs object. This ptr gets installed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) * in fc->iq->priv. Once fuse_conn is going away, it calls ->put()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) * to drop the reference to this object.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) fs = virtio_fs_find_instance(fsc->source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) if (!fs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) pr_info("virtio-fs: tag <%s> not found\n", fsc->source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) fc = kzalloc(sizeof(struct fuse_conn), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) if (!fc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) virtio_fs_put(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) if (!fm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) mutex_lock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) virtio_fs_put(fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) mutex_unlock(&virtio_fs_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) kfree(fc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) fuse_conn_init(fc, fm, fsc->user_ns, &virtio_fs_fiq_ops, fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) fc->release = fuse_free_conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) fc->delete_stale = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) fc->auto_submounts = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) fsc->s_fs_info = fm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) sb = sget_fc(fsc, virtio_fs_test_super, virtio_fs_set_super);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) fuse_mount_put(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) if (IS_ERR(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) return PTR_ERR(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) if (!sb->s_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) err = virtio_fs_fill_super(sb, fsc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) fuse_mount_put(fm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) sb->s_fs_info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) deactivate_locked_super(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) sb->s_flags |= SB_ACTIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) WARN_ON(fsc->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) fsc->root = dget(sb->s_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) static const struct fs_context_operations virtio_fs_context_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) .free = virtio_fs_free_fc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) .parse_param = virtio_fs_parse_param,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) .get_tree = virtio_fs_get_tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) static int virtio_fs_init_fs_context(struct fs_context *fsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) struct fuse_fs_context *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) if (!ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) fsc->fs_private = ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) fsc->ops = &virtio_fs_context_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) static struct file_system_type virtio_fs_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) .name = "virtiofs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) .init_fs_context = virtio_fs_init_fs_context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) .kill_sb = virtio_kill_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) static int __init virtio_fs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) ret = register_virtio_driver(&virtio_fs_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) ret = register_filesystem(&virtio_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) unregister_virtio_driver(&virtio_fs_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) module_init(virtio_fs_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) static void __exit virtio_fs_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) unregister_filesystem(&virtio_fs_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) unregister_virtio_driver(&virtio_fs_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) module_exit(virtio_fs_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) MODULE_AUTHOR("Stefan Hajnoczi <stefanha@redhat.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) MODULE_DESCRIPTION("Virtio Filesystem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) MODULE_ALIAS_FS(KBUILD_MODNAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) MODULE_DEVICE_TABLE(virtio, id_table);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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