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fs/fuse/virtio_fs.c
36.8 KB
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// SPDX-License-Identifier: GPL-2.0 /* * virtio-fs: Virtio Filesystem * Copyright (C) 2018 Red Hat, Inc. */ #include <linux/fs.h> |
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#include <linux/dax.h> #include <linux/pci.h> #include <linux/pfn_t.h> |
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#include <linux/module.h> #include <linux/virtio.h> #include <linux/virtio_fs.h> #include <linux/delay.h> #include <linux/fs_context.h> |
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#include <linux/fs_parser.h> |
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#include <linux/highmem.h> |
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#include <linux/uio.h> |
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#include "fuse_i.h" /* List of virtio-fs device instances and a lock for the list. Also provides * mutual exclusion in device removal and mounting path */ static DEFINE_MUTEX(virtio_fs_mutex); static LIST_HEAD(virtio_fs_instances); enum { VQ_HIPRIO, VQ_REQUEST }; |
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#define VQ_NAME_LEN 24 |
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/* Per-virtqueue state */ struct virtio_fs_vq { spinlock_t lock; struct virtqueue *vq; /* protected by ->lock */ struct work_struct done_work; struct list_head queued_reqs; |
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struct list_head end_reqs; /* End these requests */ |
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struct delayed_work dispatch_work; struct fuse_dev *fud; bool connected; long in_flight; |
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struct completion in_flight_zero; /* No inflight requests */ |
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char name[VQ_NAME_LEN]; |
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} ____cacheline_aligned_in_smp; /* A virtio-fs device instance */ struct virtio_fs { struct kref refcount; struct list_head list; /* on virtio_fs_instances */ char *tag; struct virtio_fs_vq *vqs; unsigned int nvqs; /* number of virtqueues */ unsigned int num_request_queues; /* number of request queues */ |
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struct dax_device *dax_dev; /* DAX memory window where file contents are mapped */ void *window_kaddr; phys_addr_t window_phys_addr; size_t window_len; |
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}; |
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struct virtio_fs_forget_req { |
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struct fuse_in_header ih; struct fuse_forget_in arg; |
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}; struct virtio_fs_forget { |
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/* This request can be temporarily queued on virt queue */ struct list_head list; |
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struct virtio_fs_forget_req req; |
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}; |
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struct virtio_fs_req_work { struct fuse_req *req; struct virtio_fs_vq *fsvq; struct work_struct done_work; }; |
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static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq, struct fuse_req *req, bool in_flight); |
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enum { OPT_DAX, }; static const struct fs_parameter_spec virtio_fs_parameters[] = { fsparam_flag("dax", OPT_DAX), {} }; static int virtio_fs_parse_param(struct fs_context *fc, struct fs_parameter *param) { struct fs_parse_result result; struct fuse_fs_context *ctx = fc->fs_private; int opt; opt = fs_parse(fc, virtio_fs_parameters, param, &result); if (opt < 0) return opt; switch (opt) { case OPT_DAX: ctx->dax = 1; break; default: return -EINVAL; } return 0; } static void virtio_fs_free_fc(struct fs_context *fc) { struct fuse_fs_context *ctx = fc->fs_private; kfree(ctx); } |
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static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq) { struct virtio_fs *fs = vq->vdev->priv; return &fs->vqs[vq->index]; } static inline struct fuse_pqueue *vq_to_fpq(struct virtqueue *vq) { return &vq_to_fsvq(vq)->fud->pq; } |
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/* Should be called with fsvq->lock held. */ static inline void inc_in_flight_req(struct virtio_fs_vq *fsvq) { fsvq->in_flight++; } /* Should be called with fsvq->lock held. */ static inline void dec_in_flight_req(struct virtio_fs_vq *fsvq) { WARN_ON(fsvq->in_flight <= 0); fsvq->in_flight--; |
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if (!fsvq->in_flight) complete(&fsvq->in_flight_zero); |
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} |
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static void release_virtio_fs_obj(struct kref *ref) { struct virtio_fs *vfs = container_of(ref, struct virtio_fs, refcount); kfree(vfs->vqs); kfree(vfs); } /* Make sure virtiofs_mutex is held */ static void virtio_fs_put(struct virtio_fs *fs) { kref_put(&fs->refcount, release_virtio_fs_obj); } static void virtio_fs_fiq_release(struct fuse_iqueue *fiq) { struct virtio_fs *vfs = fiq->priv; mutex_lock(&virtio_fs_mutex); virtio_fs_put(vfs); mutex_unlock(&virtio_fs_mutex); } static void virtio_fs_drain_queue(struct virtio_fs_vq *fsvq) { WARN_ON(fsvq->in_flight < 0); /* Wait for in flight requests to finish.*/ |
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spin_lock(&fsvq->lock); if (fsvq->in_flight) { /* We are holding virtio_fs_mutex. There should not be any * waiters waiting for completion. */ reinit_completion(&fsvq->in_flight_zero); spin_unlock(&fsvq->lock); wait_for_completion(&fsvq->in_flight_zero); } else { |
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spin_unlock(&fsvq->lock); |
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} flush_work(&fsvq->done_work); flush_delayed_work(&fsvq->dispatch_work); } |
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static void virtio_fs_drain_all_queues_locked(struct virtio_fs *fs) |
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{ struct virtio_fs_vq *fsvq; int i; for (i = 0; i < fs->nvqs; i++) { fsvq = &fs->vqs[i]; |
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virtio_fs_drain_queue(fsvq); } } |
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static void virtio_fs_drain_all_queues(struct virtio_fs *fs) { /* Provides mutual exclusion between ->remove and ->kill_sb * paths. We don't want both of these draining queue at the * same time. Current completion logic reinits completion * and that means there should not be any other thread * doing reinit or waiting for completion already. */ mutex_lock(&virtio_fs_mutex); virtio_fs_drain_all_queues_locked(fs); mutex_unlock(&virtio_fs_mutex); } |
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static void virtio_fs_start_all_queues(struct virtio_fs *fs) { struct virtio_fs_vq *fsvq; int i; for (i = 0; i < fs->nvqs; i++) { fsvq = &fs->vqs[i]; spin_lock(&fsvq->lock); fsvq->connected = true; spin_unlock(&fsvq->lock); } } /* Add a new instance to the list or return -EEXIST if tag name exists*/ static int virtio_fs_add_instance(struct virtio_fs *fs) { struct virtio_fs *fs2; bool duplicate = false; mutex_lock(&virtio_fs_mutex); list_for_each_entry(fs2, &virtio_fs_instances, list) { if (strcmp(fs->tag, fs2->tag) == 0) duplicate = true; } if (!duplicate) list_add_tail(&fs->list, &virtio_fs_instances); mutex_unlock(&virtio_fs_mutex); if (duplicate) return -EEXIST; return 0; } /* Return the virtio_fs with a given tag, or NULL */ static struct virtio_fs *virtio_fs_find_instance(const char *tag) { struct virtio_fs *fs; mutex_lock(&virtio_fs_mutex); list_for_each_entry(fs, &virtio_fs_instances, list) { if (strcmp(fs->tag, tag) == 0) { kref_get(&fs->refcount); goto found; } } fs = NULL; /* not found */ found: mutex_unlock(&virtio_fs_mutex); return fs; } static void virtio_fs_free_devs(struct virtio_fs *fs) { unsigned int i; for (i = 0; i < fs->nvqs; i++) { struct virtio_fs_vq *fsvq = &fs->vqs[i]; if (!fsvq->fud) continue; fuse_dev_free(fsvq->fud); fsvq->fud = NULL; } } /* Read filesystem name from virtio config into fs->tag (must kfree()). */ static int virtio_fs_read_tag(struct virtio_device *vdev, struct virtio_fs *fs) { char tag_buf[sizeof_field(struct virtio_fs_config, tag)]; char *end; size_t len; virtio_cread_bytes(vdev, offsetof(struct virtio_fs_config, tag), &tag_buf, sizeof(tag_buf)); end = memchr(tag_buf, '\0', sizeof(tag_buf)); if (end == tag_buf) return -EINVAL; /* empty tag */ if (!end) end = &tag_buf[sizeof(tag_buf)]; len = end - tag_buf; fs->tag = devm_kmalloc(&vdev->dev, len + 1, GFP_KERNEL); if (!fs->tag) return -ENOMEM; memcpy(fs->tag, tag_buf, len); fs->tag[len] = '\0'; return 0; } /* Work function for hiprio completion */ static void virtio_fs_hiprio_done_work(struct work_struct *work) { struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, done_work); struct virtqueue *vq = fsvq->vq; /* Free completed FUSE_FORGET requests */ spin_lock(&fsvq->lock); do { unsigned int len; void *req; virtqueue_disable_cb(vq); while ((req = virtqueue_get_buf(vq, &len)) != NULL) { kfree(req); |
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dec_in_flight_req(fsvq); |
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} } while (!virtqueue_enable_cb(vq) && likely(!virtqueue_is_broken(vq))); spin_unlock(&fsvq->lock); } |
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static void virtio_fs_request_dispatch_work(struct work_struct *work) |
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{ |
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struct fuse_req *req; struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, dispatch_work.work); |
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int ret; |
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pr_debug("virtio-fs: worker %s called. ", __func__); while (1) { spin_lock(&fsvq->lock); req = list_first_entry_or_null(&fsvq->end_reqs, struct fuse_req, list); if (!req) { spin_unlock(&fsvq->lock); |
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break; |
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} list_del_init(&req->list); spin_unlock(&fsvq->lock); |
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fuse_request_end(req); |
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} |
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/* Dispatch pending requests */ while (1) { spin_lock(&fsvq->lock); req = list_first_entry_or_null(&fsvq->queued_reqs, struct fuse_req, list); if (!req) { spin_unlock(&fsvq->lock); return; } list_del_init(&req->list); spin_unlock(&fsvq->lock); ret = virtio_fs_enqueue_req(fsvq, req, true); if (ret < 0) { if (ret == -ENOMEM || ret == -ENOSPC) { spin_lock(&fsvq->lock); list_add_tail(&req->list, &fsvq->queued_reqs); schedule_delayed_work(&fsvq->dispatch_work, msecs_to_jiffies(1)); spin_unlock(&fsvq->lock); return; } req->out.h.error = ret; spin_lock(&fsvq->lock); dec_in_flight_req(fsvq); spin_unlock(&fsvq->lock); pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d ", ret); |
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fuse_request_end(req); |
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} } |
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} |
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/* * Returns 1 if queue is full and sender should wait a bit before sending * next request, 0 otherwise. */ static int send_forget_request(struct virtio_fs_vq *fsvq, struct virtio_fs_forget *forget, bool in_flight) { struct scatterlist sg; struct virtqueue *vq; int ret = 0; bool notify; |
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struct virtio_fs_forget_req *req = &forget->req; |
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spin_lock(&fsvq->lock); if (!fsvq->connected) { if (in_flight) dec_in_flight_req(fsvq); kfree(forget); goto out; } |
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sg_init_one(&sg, req, sizeof(*req)); |
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vq = fsvq->vq; dev_dbg(&vq->vdev->dev, "%s ", __func__); ret = virtqueue_add_outbuf(vq, &sg, 1, forget, GFP_ATOMIC); if (ret < 0) { if (ret == -ENOMEM || ret == -ENOSPC) { pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later ", ret); list_add_tail(&forget->list, &fsvq->queued_reqs); schedule_delayed_work(&fsvq->dispatch_work, msecs_to_jiffies(1)); if (!in_flight) inc_in_flight_req(fsvq); /* Queue is full */ ret = 1; } else { pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it. ", ret); kfree(forget); if (in_flight) dec_in_flight_req(fsvq); } goto out; } if (!in_flight) inc_in_flight_req(fsvq); notify = virtqueue_kick_prepare(vq); spin_unlock(&fsvq->lock); if (notify) virtqueue_notify(vq); return ret; out: spin_unlock(&fsvq->lock); return ret; } |
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static void virtio_fs_hiprio_dispatch_work(struct work_struct *work) { struct virtio_fs_forget *forget; struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, dispatch_work.work); |
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pr_debug("virtio-fs: worker %s called. ", __func__); while (1) { spin_lock(&fsvq->lock); forget = list_first_entry_or_null(&fsvq->queued_reqs, struct virtio_fs_forget, list); if (!forget) { spin_unlock(&fsvq->lock); return; } list_del(&forget->list); |
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spin_unlock(&fsvq->lock); |
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if (send_forget_request(fsvq, forget, true)) return; |
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} } /* Allocate and copy args into req->argbuf */ static int copy_args_to_argbuf(struct fuse_req *req) { struct fuse_args *args = req->args; unsigned int offset = 0; unsigned int num_in; unsigned int num_out; unsigned int len; unsigned int i; num_in = args->in_numargs - args->in_pages; num_out = args->out_numargs - args->out_pages; len = fuse_len_args(num_in, (struct fuse_arg *) args->in_args) + fuse_len_args(num_out, args->out_args); req->argbuf = kmalloc(len, GFP_ATOMIC); if (!req->argbuf) return -ENOMEM; for (i = 0; i < num_in; i++) { memcpy(req->argbuf + offset, args->in_args[i].value, args->in_args[i].size); offset += args->in_args[i].size; } return 0; } /* Copy args out of and free req->argbuf */ static void copy_args_from_argbuf(struct fuse_args *args, struct fuse_req *req) { unsigned int remaining; unsigned int offset; unsigned int num_in; unsigned int num_out; unsigned int i; remaining = req->out.h.len - sizeof(req->out.h); num_in = args->in_numargs - args->in_pages; num_out = args->out_numargs - args->out_pages; offset = fuse_len_args(num_in, (struct fuse_arg *)args->in_args); for (i = 0; i < num_out; i++) { unsigned int argsize = args->out_args[i].size; if (args->out_argvar && i == args->out_numargs - 1 && argsize > remaining) { argsize = remaining; } memcpy(args->out_args[i].value, req->argbuf + offset, argsize); offset += argsize; if (i != args->out_numargs - 1) remaining -= argsize; } /* Store the actual size of the variable-length arg */ if (args->out_argvar) args->out_args[args->out_numargs - 1].size = remaining; kfree(req->argbuf); req->argbuf = NULL; } /* Work function for request completion */ |
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static void virtio_fs_request_complete(struct fuse_req *req, struct virtio_fs_vq *fsvq) { struct fuse_pqueue *fpq = &fsvq->fud->pq; |
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struct fuse_args *args; struct fuse_args_pages *ap; unsigned int len, i, thislen; struct page *page; /* * TODO verify that server properly follows FUSE protocol * (oh.uniq, oh.len) */ args = req->args; copy_args_from_argbuf(args, req); if (args->out_pages && args->page_zeroing) { len = args->out_args[args->out_numargs - 1].size; ap = container_of(args, typeof(*ap), args); for (i = 0; i < ap->num_pages; i++) { thislen = ap->descs[i].length; if (len < thislen) { WARN_ON(ap->descs[i].offset); page = ap->pages[i]; zero_user_segment(page, len, thislen); len = 0; } else { len -= thislen; } } } spin_lock(&fpq->lock); clear_bit(FR_SENT, &req->flags); spin_unlock(&fpq->lock); |
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fuse_request_end(req); |
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spin_lock(&fsvq->lock); dec_in_flight_req(fsvq); spin_unlock(&fsvq->lock); } static void virtio_fs_complete_req_work(struct work_struct *work) { struct virtio_fs_req_work *w = container_of(work, typeof(*w), done_work); virtio_fs_request_complete(w->req, w->fsvq); kfree(w); } |
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static void virtio_fs_requests_done_work(struct work_struct *work) { struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq, done_work); struct fuse_pqueue *fpq = &fsvq->fud->pq; |
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struct virtqueue *vq = fsvq->vq; struct fuse_req *req; |
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struct fuse_req *next; |
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unsigned int len; |
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LIST_HEAD(reqs); /* Collect completed requests off the virtqueue */ spin_lock(&fsvq->lock); do { virtqueue_disable_cb(vq); while ((req = virtqueue_get_buf(vq, &len)) != NULL) { spin_lock(&fpq->lock); list_move_tail(&req->list, &reqs); spin_unlock(&fpq->lock); } } while (!virtqueue_enable_cb(vq) && likely(!virtqueue_is_broken(vq))); spin_unlock(&fsvq->lock); /* End requests */ list_for_each_entry_safe(req, next, &reqs, list) { |
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list_del_init(&req->list); |
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/* blocking async request completes in a worker context */ if (req->args->may_block) { struct virtio_fs_req_work *w; w = kzalloc(sizeof(*w), GFP_NOFS | __GFP_NOFAIL); INIT_WORK(&w->done_work, virtio_fs_complete_req_work); w->fsvq = fsvq; w->req = req; schedule_work(&w->done_work); } else { virtio_fs_request_complete(req, fsvq); } |
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} } /* Virtqueue interrupt handler */ static void virtio_fs_vq_done(struct virtqueue *vq) { struct virtio_fs_vq *fsvq = vq_to_fsvq(vq); dev_dbg(&vq->vdev->dev, "%s %s ", __func__, fsvq->name); schedule_work(&fsvq->done_work); } |
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static void virtio_fs_init_vq(struct virtio_fs_vq *fsvq, char *name, int vq_type) { strncpy(fsvq->name, name, VQ_NAME_LEN); spin_lock_init(&fsvq->lock); INIT_LIST_HEAD(&fsvq->queued_reqs); INIT_LIST_HEAD(&fsvq->end_reqs); init_completion(&fsvq->in_flight_zero); if (vq_type == VQ_REQUEST) { INIT_WORK(&fsvq->done_work, virtio_fs_requests_done_work); INIT_DELAYED_WORK(&fsvq->dispatch_work, virtio_fs_request_dispatch_work); } else { INIT_WORK(&fsvq->done_work, virtio_fs_hiprio_done_work); INIT_DELAYED_WORK(&fsvq->dispatch_work, virtio_fs_hiprio_dispatch_work); } } |
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/* Initialize virtqueues */ static int virtio_fs_setup_vqs(struct virtio_device *vdev, struct virtio_fs *fs) { struct virtqueue **vqs; vq_callback_t **callbacks; const char **names; unsigned int i; int ret = 0; |
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virtio_cread_le(vdev, struct virtio_fs_config, num_request_queues, &fs->num_request_queues); |
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if (fs->num_request_queues == 0) return -EINVAL; |
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fs->nvqs = VQ_REQUEST + fs->num_request_queues; |
a62a8ef9d virtio-fs: add vi... |
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fs->vqs = kcalloc(fs->nvqs, sizeof(fs->vqs[VQ_HIPRIO]), GFP_KERNEL); if (!fs->vqs) return -ENOMEM; vqs = kmalloc_array(fs->nvqs, sizeof(vqs[VQ_HIPRIO]), GFP_KERNEL); callbacks = kmalloc_array(fs->nvqs, sizeof(callbacks[VQ_HIPRIO]), GFP_KERNEL); names = kmalloc_array(fs->nvqs, sizeof(names[VQ_HIPRIO]), GFP_KERNEL); if (!vqs || !callbacks || !names) { ret = -ENOMEM; goto out; } |
b43b7e81e virtiofs: provide... |
681 |
/* Initialize the hiprio/forget request virtqueue */ |
a62a8ef9d virtio-fs: add vi... |
682 |
callbacks[VQ_HIPRIO] = virtio_fs_vq_done; |
b43b7e81e virtiofs: provide... |
683 |
virtio_fs_init_vq(&fs->vqs[VQ_HIPRIO], "hiprio", VQ_HIPRIO); |
a62a8ef9d virtio-fs: add vi... |
684 |
names[VQ_HIPRIO] = fs->vqs[VQ_HIPRIO].name; |
a62a8ef9d virtio-fs: add vi... |
685 686 687 |
/* Initialize the requests virtqueues */ for (i = VQ_REQUEST; i < fs->nvqs; i++) { |
b43b7e81e virtiofs: provide... |
688 689 690 691 |
char vq_name[VQ_NAME_LEN]; snprintf(vq_name, VQ_NAME_LEN, "requests.%u", i - VQ_REQUEST); virtio_fs_init_vq(&fs->vqs[i], vq_name, VQ_REQUEST); |
a62a8ef9d virtio-fs: add vi... |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
callbacks[i] = virtio_fs_vq_done; names[i] = fs->vqs[i].name; } ret = virtio_find_vqs(vdev, fs->nvqs, vqs, callbacks, names, NULL); if (ret < 0) goto out; for (i = 0; i < fs->nvqs; i++) fs->vqs[i].vq = vqs[i]; virtio_fs_start_all_queues(fs); out: kfree(names); kfree(callbacks); kfree(vqs); if (ret) kfree(fs->vqs); return ret; } /* Free virtqueues (device must already be reset) */ static void virtio_fs_cleanup_vqs(struct virtio_device *vdev, struct virtio_fs *fs) { vdev->config->del_vqs(vdev); } |
22f3787e9 virtiofs: set up ... |
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 |
/* Map a window offset to a page frame number. The window offset will have * been produced by .iomap_begin(), which maps a file offset to a window * offset. */ static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { struct virtio_fs *fs = dax_get_private(dax_dev); phys_addr_t offset = PFN_PHYS(pgoff); size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff; if (kaddr) *kaddr = fs->window_kaddr + offset; if (pfn) *pfn = phys_to_pfn_t(fs->window_phys_addr + offset, PFN_DEV | PFN_MAP); return nr_pages > max_nr_pages ? max_nr_pages : nr_pages; } static size_t virtio_fs_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { return copy_from_iter(addr, bytes, i); } static size_t virtio_fs_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { return copy_to_iter(addr, bytes, i); } static int virtio_fs_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, size_t nr_pages) { long rc; void *kaddr; rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL); if (rc < 0) return rc; memset(kaddr, 0, nr_pages << PAGE_SHIFT); dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT); return 0; } static const struct dax_operations virtio_fs_dax_ops = { .direct_access = virtio_fs_direct_access, .copy_from_iter = virtio_fs_copy_from_iter, .copy_to_iter = virtio_fs_copy_to_iter, .zero_page_range = virtio_fs_zero_page_range, }; static void virtio_fs_cleanup_dax(void *data) { struct dax_device *dax_dev = data; kill_dax(dax_dev); put_dax(dax_dev); } static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) { struct virtio_shm_region cache_reg; struct dev_pagemap *pgmap; bool have_cache; if (!IS_ENABLED(CONFIG_FUSE_DAX)) return 0; /* Get cache region */ have_cache = virtio_get_shm_region(vdev, &cache_reg, (u8)VIRTIO_FS_SHMCAP_ID_CACHE); if (!have_cache) { dev_notice(&vdev->dev, "%s: No cache capability ", __func__); return 0; } if (!devm_request_mem_region(&vdev->dev, cache_reg.addr, cache_reg.len, dev_name(&vdev->dev))) { dev_warn(&vdev->dev, "could not reserve region addr=0x%llx len=0x%llx ", cache_reg.addr, cache_reg.len); return -EBUSY; } dev_notice(&vdev->dev, "Cache len: 0x%llx @ 0x%llx ", cache_reg.len, cache_reg.addr); pgmap = devm_kzalloc(&vdev->dev, sizeof(*pgmap), GFP_KERNEL); if (!pgmap) return -ENOMEM; pgmap->type = MEMORY_DEVICE_FS_DAX; /* Ideally we would directly use the PCI BAR resource but * devm_memremap_pages() wants its own copy in pgmap. So * initialize a struct resource from scratch (only the start * and end fields will be used). */ |
694565356 Merge tag 'fuse-u... |
822 |
pgmap->range = (struct range) { |
22f3787e9 virtiofs: set up ... |
823 824 825 |
.start = (phys_addr_t) cache_reg.addr, .end = (phys_addr_t) cache_reg.addr + cache_reg.len - 1, }; |
694565356 Merge tag 'fuse-u... |
826 |
pgmap->nr_range = 1; |
22f3787e9 virtiofs: set up ... |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
fs->window_kaddr = devm_memremap_pages(&vdev->dev, pgmap); if (IS_ERR(fs->window_kaddr)) return PTR_ERR(fs->window_kaddr); fs->window_phys_addr = (phys_addr_t) cache_reg.addr; fs->window_len = (phys_addr_t) cache_reg.len; dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx ", __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len); fs->dax_dev = alloc_dax(fs, NULL, &virtio_fs_dax_ops, 0); if (IS_ERR(fs->dax_dev)) return PTR_ERR(fs->dax_dev); return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax, fs->dax_dev); } |
a62a8ef9d virtio-fs: add vi... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 |
static int virtio_fs_probe(struct virtio_device *vdev) { struct virtio_fs *fs; int ret; fs = kzalloc(sizeof(*fs), GFP_KERNEL); if (!fs) return -ENOMEM; kref_init(&fs->refcount); vdev->priv = fs; ret = virtio_fs_read_tag(vdev, fs); if (ret < 0) goto out; ret = virtio_fs_setup_vqs(vdev, fs); if (ret < 0) goto out; /* TODO vq affinity */ |
22f3787e9 virtiofs: set up ... |
866 867 868 |
ret = virtio_fs_setup_dax(vdev, fs); if (ret < 0) goto out_vqs; |
a62a8ef9d virtio-fs: add vi... |
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 |
/* Bring the device online in case the filesystem is mounted and * requests need to be sent before we return. */ virtio_device_ready(vdev); ret = virtio_fs_add_instance(fs); if (ret < 0) goto out_vqs; return 0; out_vqs: vdev->config->reset(vdev); virtio_fs_cleanup_vqs(vdev, fs); out: vdev->priv = NULL; kfree(fs); return ret; } static void virtio_fs_stop_all_queues(struct virtio_fs *fs) { struct virtio_fs_vq *fsvq; int i; for (i = 0; i < fs->nvqs; i++) { fsvq = &fs->vqs[i]; spin_lock(&fsvq->lock); fsvq->connected = false; spin_unlock(&fsvq->lock); } } static void virtio_fs_remove(struct virtio_device *vdev) { struct virtio_fs *fs = vdev->priv; mutex_lock(&virtio_fs_mutex); /* This device is going away. No one should get new reference */ list_del_init(&fs->list); virtio_fs_stop_all_queues(fs); |
724c15a43 virtiofs: Use com... |
911 |
virtio_fs_drain_all_queues_locked(fs); |
a62a8ef9d virtio-fs: add vi... |
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 |
vdev->config->reset(vdev); virtio_fs_cleanup_vqs(vdev, fs); vdev->priv = NULL; /* Put device reference on virtio_fs object */ virtio_fs_put(fs); mutex_unlock(&virtio_fs_mutex); } #ifdef CONFIG_PM_SLEEP static int virtio_fs_freeze(struct virtio_device *vdev) { /* TODO need to save state here */ pr_warn("virtio-fs: suspend/resume not yet supported "); return -EOPNOTSUPP; } static int virtio_fs_restore(struct virtio_device *vdev) { /* TODO need to restore state here */ return 0; } #endif /* CONFIG_PM_SLEEP */ |
00929447f virtiofs: Fix old... |
936 |
static const struct virtio_device_id id_table[] = { |
a62a8ef9d virtio-fs: add vi... |
937 938 939 |
{ VIRTIO_ID_FS, VIRTIO_DEV_ANY_ID }, {}, }; |
00929447f virtiofs: Fix old... |
940 |
static const unsigned int feature_table[] = {}; |
a62a8ef9d virtio-fs: add vi... |
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 |
static struct virtio_driver virtio_fs_driver = { .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .id_table = id_table, .feature_table = feature_table, .feature_table_size = ARRAY_SIZE(feature_table), .probe = virtio_fs_probe, .remove = virtio_fs_remove, #ifdef CONFIG_PM_SLEEP .freeze = virtio_fs_freeze, .restore = virtio_fs_restore, #endif }; static void virtio_fs_wake_forget_and_unlock(struct fuse_iqueue *fiq) __releases(fiq->lock) { struct fuse_forget_link *link; struct virtio_fs_forget *forget; |
1efcf39eb virtiofs: Do not ... |
961 |
struct virtio_fs_forget_req *req; |
a62a8ef9d virtio-fs: add vi... |
962 |
struct virtio_fs *fs; |
a62a8ef9d virtio-fs: add vi... |
963 |
struct virtio_fs_vq *fsvq; |
a62a8ef9d virtio-fs: add vi... |
964 |
u64 unique; |
a62a8ef9d virtio-fs: add vi... |
965 966 967 968 969 970 971 972 973 974 |
link = fuse_dequeue_forget(fiq, 1, NULL); unique = fuse_get_unique(fiq); fs = fiq->priv; fsvq = &fs->vqs[VQ_HIPRIO]; spin_unlock(&fiq->lock); /* Allocate a buffer for the request */ forget = kmalloc(sizeof(*forget), GFP_NOFS | __GFP_NOFAIL); |
1efcf39eb virtiofs: Do not ... |
975 |
req = &forget->req; |
a62a8ef9d virtio-fs: add vi... |
976 |
|
1efcf39eb virtiofs: Do not ... |
977 |
req->ih = (struct fuse_in_header){ |
a62a8ef9d virtio-fs: add vi... |
978 979 980 |
.opcode = FUSE_FORGET, .nodeid = link->forget_one.nodeid, .unique = unique, |
1efcf39eb virtiofs: Do not ... |
981 |
.len = sizeof(*req), |
a62a8ef9d virtio-fs: add vi... |
982 |
}; |
1efcf39eb virtiofs: Do not ... |
983 |
req->arg = (struct fuse_forget_in){ |
a62a8ef9d virtio-fs: add vi... |
984 985 |
.nlookup = link->forget_one.nlookup, }; |
58ada94f9 virtiofs: Use a c... |
986 |
send_forget_request(fsvq, forget, false); |
a62a8ef9d virtio-fs: add vi... |
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 |
kfree(link); } static void virtio_fs_wake_interrupt_and_unlock(struct fuse_iqueue *fiq) __releases(fiq->lock) { /* * TODO interrupts. * * Normal fs operations on a local filesystems aren't interruptible. * Exceptions are blocking lock operations; for example fcntl(F_SETLKW) * with shared lock between host and guest. */ spin_unlock(&fiq->lock); } |
42d3e2d04 virtiofs: calcula... |
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
/* Count number of scatter-gather elements required */ static unsigned int sg_count_fuse_pages(struct fuse_page_desc *page_descs, unsigned int num_pages, unsigned int total_len) { unsigned int i; unsigned int this_len; for (i = 0; i < num_pages && total_len; i++) { this_len = min(page_descs[i].length, total_len); total_len -= this_len; } return i; } |
a62a8ef9d virtio-fs: add vi... |
1017 1018 1019 1020 1021 |
/* Return the number of scatter-gather list elements required */ static unsigned int sg_count_fuse_req(struct fuse_req *req) { struct fuse_args *args = req->args; struct fuse_args_pages *ap = container_of(args, typeof(*ap), args); |
42d3e2d04 virtiofs: calcula... |
1022 |
unsigned int size, total_sgs = 1 /* fuse_in_header */; |
a62a8ef9d virtio-fs: add vi... |
1023 1024 1025 |
if (args->in_numargs - args->in_pages) total_sgs += 1; |
42d3e2d04 virtiofs: calcula... |
1026 1027 1028 1029 1030 |
if (args->in_pages) { size = args->in_args[args->in_numargs - 1].size; total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages, size); } |
a62a8ef9d virtio-fs: add vi... |
1031 1032 1033 1034 1035 1036 1037 1038 |
if (!test_bit(FR_ISREPLY, &req->flags)) return total_sgs; total_sgs += 1 /* fuse_out_header */; if (args->out_numargs - args->out_pages) total_sgs += 1; |
42d3e2d04 virtiofs: calcula... |
1039 1040 1041 1042 1043 |
if (args->out_pages) { size = args->out_args[args->out_numargs - 1].size; total_sgs += sg_count_fuse_pages(ap->descs, ap->num_pages, size); } |
a62a8ef9d virtio-fs: add vi... |
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 |
return total_sgs; } /* Add pages to scatter-gather list and return number of elements used */ static unsigned int sg_init_fuse_pages(struct scatterlist *sg, struct page **pages, struct fuse_page_desc *page_descs, unsigned int num_pages, unsigned int total_len) { unsigned int i; unsigned int this_len; for (i = 0; i < num_pages && total_len; i++) { sg_init_table(&sg[i], 1); this_len = min(page_descs[i].length, total_len); sg_set_page(&sg[i], pages[i], this_len, page_descs[i].offset); total_len -= this_len; } return i; } /* Add args to scatter-gather list and return number of elements used */ static unsigned int sg_init_fuse_args(struct scatterlist *sg, struct fuse_req *req, struct fuse_arg *args, unsigned int numargs, bool argpages, void *argbuf, unsigned int *len_used) { struct fuse_args_pages *ap = container_of(req->args, typeof(*ap), args); unsigned int total_sgs = 0; unsigned int len; len = fuse_len_args(numargs - argpages, args); if (len) sg_init_one(&sg[total_sgs++], argbuf, len); if (argpages) total_sgs += sg_init_fuse_pages(&sg[total_sgs], ap->pages, ap->descs, ap->num_pages, args[numargs - 1].size); if (len_used) *len_used = len; return total_sgs; } /* Add a request to a virtqueue and kick the device */ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq, |
a9bfd9dd3 virtiofs: Retry r... |
1099 |
struct fuse_req *req, bool in_flight) |
a62a8ef9d virtio-fs: add vi... |
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 |
{ /* requests need at least 4 elements */ struct scatterlist *stack_sgs[6]; struct scatterlist stack_sg[ARRAY_SIZE(stack_sgs)]; struct scatterlist **sgs = stack_sgs; struct scatterlist *sg = stack_sg; struct virtqueue *vq; struct fuse_args *args = req->args; unsigned int argbuf_used = 0; unsigned int out_sgs = 0; unsigned int in_sgs = 0; unsigned int total_sgs; unsigned int i; int ret; bool notify; |
5dbe190f3 virtiofs: Set FR_... |
1115 |
struct fuse_pqueue *fpq; |
a62a8ef9d virtio-fs: add vi... |
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 |
/* Does the sglist fit on the stack? */ total_sgs = sg_count_fuse_req(req); if (total_sgs > ARRAY_SIZE(stack_sgs)) { sgs = kmalloc_array(total_sgs, sizeof(sgs[0]), GFP_ATOMIC); sg = kmalloc_array(total_sgs, sizeof(sg[0]), GFP_ATOMIC); if (!sgs || !sg) { ret = -ENOMEM; goto out; } } /* Use a bounce buffer since stack args cannot be mapped */ ret = copy_args_to_argbuf(req); if (ret < 0) goto out; /* Request elements */ sg_init_one(&sg[out_sgs++], &req->in.h, sizeof(req->in.h)); out_sgs += sg_init_fuse_args(&sg[out_sgs], req, (struct fuse_arg *)args->in_args, args->in_numargs, args->in_pages, req->argbuf, &argbuf_used); /* Reply elements */ if (test_bit(FR_ISREPLY, &req->flags)) { sg_init_one(&sg[out_sgs + in_sgs++], &req->out.h, sizeof(req->out.h)); in_sgs += sg_init_fuse_args(&sg[out_sgs + in_sgs], req, args->out_args, args->out_numargs, args->out_pages, req->argbuf + argbuf_used, NULL); } WARN_ON(out_sgs + in_sgs != total_sgs); for (i = 0; i < total_sgs; i++) sgs[i] = &sg[i]; spin_lock(&fsvq->lock); if (!fsvq->connected) { spin_unlock(&fsvq->lock); ret = -ENOTCONN; goto out; } vq = fsvq->vq; ret = virtqueue_add_sgs(vq, sgs, out_sgs, in_sgs, req, GFP_ATOMIC); if (ret < 0) { spin_unlock(&fsvq->lock); goto out; } |
5dbe190f3 virtiofs: Set FR_... |
1169 1170 1171 1172 1173 1174 1175 1176 |
/* Request successfully sent. */ fpq = &fsvq->fud->pq; spin_lock(&fpq->lock); list_add_tail(&req->list, fpq->processing); spin_unlock(&fpq->lock); set_bit(FR_SENT, &req->flags); /* matches barrier in request_wait_answer() */ smp_mb__after_atomic(); |
a9bfd9dd3 virtiofs: Retry r... |
1177 1178 |
if (!in_flight) inc_in_flight_req(fsvq); |
a62a8ef9d virtio-fs: add vi... |
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
notify = virtqueue_kick_prepare(vq); spin_unlock(&fsvq->lock); if (notify) virtqueue_notify(vq); out: if (ret < 0 && req->argbuf) { kfree(req->argbuf); req->argbuf = NULL; } if (sgs != stack_sgs) { kfree(sgs); kfree(sg); } return ret; } static void virtio_fs_wake_pending_and_unlock(struct fuse_iqueue *fiq) __releases(fiq->lock) { unsigned int queue_id = VQ_REQUEST; /* TODO multiqueue */ struct virtio_fs *fs; |
a62a8ef9d virtio-fs: add vi... |
1204 |
struct fuse_req *req; |
51fecdd25 virtiofs: Do not ... |
1205 |
struct virtio_fs_vq *fsvq; |
a62a8ef9d virtio-fs: add vi... |
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 |
int ret; WARN_ON(list_empty(&fiq->pending)); req = list_last_entry(&fiq->pending, struct fuse_req, list); clear_bit(FR_PENDING, &req->flags); list_del_init(&req->list); WARN_ON(!list_empty(&fiq->pending)); spin_unlock(&fiq->lock); fs = fiq->priv; |
a62a8ef9d virtio-fs: add vi... |
1216 1217 1218 1219 1220 1221 |
pr_debug("%s: opcode %u unique %#llx nodeid %#llx in.len %u out.len %u ", __func__, req->in.h.opcode, req->in.h.unique, req->in.h.nodeid, req->in.h.len, fuse_len_args(req->args->out_numargs, req->args->out_args)); |
51fecdd25 virtiofs: Do not ... |
1222 |
fsvq = &fs->vqs[queue_id]; |
a9bfd9dd3 virtiofs: Retry r... |
1223 |
ret = virtio_fs_enqueue_req(fsvq, req, false); |
a62a8ef9d virtio-fs: add vi... |
1224 1225 |
if (ret < 0) { if (ret == -ENOMEM || ret == -ENOSPC) { |
a9bfd9dd3 virtiofs: Retry r... |
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 |
/* * Virtqueue full. Retry submission from worker * context as we might be holding fc->bg_lock. */ spin_lock(&fsvq->lock); list_add_tail(&req->list, &fsvq->queued_reqs); inc_in_flight_req(fsvq); schedule_delayed_work(&fsvq->dispatch_work, msecs_to_jiffies(1)); spin_unlock(&fsvq->lock); return; |
a62a8ef9d virtio-fs: add vi... |
1237 1238 1239 1240 |
} req->out.h.error = ret; pr_err("virtio-fs: virtio_fs_enqueue_req() failed %d ", ret); |
51fecdd25 virtiofs: Do not ... |
1241 1242 1243 1244 1245 1246 |
/* Can't end request in submission context. Use a worker */ spin_lock(&fsvq->lock); list_add_tail(&req->list, &fsvq->end_reqs); schedule_delayed_work(&fsvq->dispatch_work, 0); spin_unlock(&fsvq->lock); |
a62a8ef9d virtio-fs: add vi... |
1247 1248 1249 |
return; } } |
00929447f virtiofs: Fix old... |
1250 |
static const struct fuse_iqueue_ops virtio_fs_fiq_ops = { |
a62a8ef9d virtio-fs: add vi... |
1251 1252 1253 1254 1255 |
.wake_forget_and_unlock = virtio_fs_wake_forget_and_unlock, .wake_interrupt_and_unlock = virtio_fs_wake_interrupt_and_unlock, .wake_pending_and_unlock = virtio_fs_wake_pending_and_unlock, .release = virtio_fs_fiq_release, }; |
1dd539577 virtiofs: add a m... |
1256 |
static inline void virtio_fs_ctx_set_defaults(struct fuse_fs_context *ctx) |
a62a8ef9d virtio-fs: add vi... |
1257 |
{ |
1dd539577 virtiofs: add a m... |
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 |
ctx->rootmode = S_IFDIR; ctx->default_permissions = 1; ctx->allow_other = 1; ctx->max_read = UINT_MAX; ctx->blksize = 512; ctx->destroy = true; ctx->no_control = true; ctx->no_force_umount = true; } static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc) |
a62a8ef9d virtio-fs: add vi... |
1269 |
{ |
fcee216be fuse: split fuse_... |
1270 1271 |
struct fuse_mount *fm = get_fuse_mount_super(sb); struct fuse_conn *fc = fm->fc; |
a62a8ef9d virtio-fs: add vi... |
1272 |
struct virtio_fs *fs = fc->iq.priv; |
1dd539577 virtiofs: add a m... |
1273 |
struct fuse_fs_context *ctx = fsc->fs_private; |
a62a8ef9d virtio-fs: add vi... |
1274 1275 |
unsigned int i; int err; |
a62a8ef9d virtio-fs: add vi... |
1276 |
|
1dd539577 virtiofs: add a m... |
1277 |
virtio_fs_ctx_set_defaults(ctx); |
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1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 |
mutex_lock(&virtio_fs_mutex); /* After holding mutex, make sure virtiofs device is still there. * Though we are holding a reference to it, drive ->remove might * still have cleaned up virtual queues. In that case bail out. */ err = -EINVAL; if (list_empty(&fs->list)) { pr_info("virtio-fs: tag <%s> not found ", fs->tag); goto err; } err = -ENOMEM; /* Allocate fuse_dev for hiprio and notification queues */ |
7fd3abfa8 virtiofs: do not ... |
1293 |
for (i = 0; i < fs->nvqs; i++) { |
a62a8ef9d virtio-fs: add vi... |
1294 1295 1296 1297 1298 1299 |
struct virtio_fs_vq *fsvq = &fs->vqs[i]; fsvq->fud = fuse_dev_alloc(); if (!fsvq->fud) goto err_free_fuse_devs; } |
7fd3abfa8 virtiofs: do not ... |
1300 |
/* virtiofs allocates and installs its own fuse devices */ |
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1301 1302 1303 1304 |
ctx->fudptr = NULL; if (ctx->dax) ctx->dax_dev = fs->dax_dev; err = fuse_fill_super_common(sb, ctx); |
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1305 1306 |
if (err < 0) goto err_free_fuse_devs; |
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1307 1308 |
for (i = 0; i < fs->nvqs; i++) { struct virtio_fs_vq *fsvq = &fs->vqs[i]; |
a62a8ef9d virtio-fs: add vi... |
1309 1310 1311 1312 1313 |
fuse_dev_install(fsvq->fud, fc); } /* Previous unmount will stop all queues. Start these again */ virtio_fs_start_all_queues(fs); |
fcee216be fuse: split fuse_... |
1314 |
fuse_send_init(fm); |
a62a8ef9d virtio-fs: add vi... |
1315 1316 1317 1318 1319 1320 1321 1322 1323 |
mutex_unlock(&virtio_fs_mutex); return 0; err_free_fuse_devs: virtio_fs_free_devs(fs); err: mutex_unlock(&virtio_fs_mutex); return err; } |
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1324 |
static void virtio_fs_conn_destroy(struct fuse_mount *fm) |
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1325 |
{ |
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struct fuse_conn *fc = fm->fc; struct virtio_fs *vfs = fc->iq.priv; struct virtio_fs_vq *fsvq = &vfs->vqs[VQ_HIPRIO]; |
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1329 |
|
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1330 1331 |
/* Stop dax worker. Soon evict_inodes() will be called which * will free all memory ranges belonging to all inodes. |
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1332 1333 1334 |
*/ if (IS_ENABLED(CONFIG_FUSE_DAX)) fuse_dax_cancel_work(fc); |
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1335 1336 1337 1338 1339 1340 |
/* Stop forget queue. Soon destroy will be sent */ spin_lock(&fsvq->lock); fsvq->connected = false; spin_unlock(&fsvq->lock); virtio_fs_drain_all_queues(vfs); |
fcee216be fuse: split fuse_... |
1341 |
fuse_conn_destroy(fm); |
a62a8ef9d virtio-fs: add vi... |
1342 |
|
fcee216be fuse: split fuse_... |
1343 |
/* fuse_conn_destroy() must have sent destroy. Stop all queues |
a62a8ef9d virtio-fs: add vi... |
1344 1345 1346 1347 1348 1349 1350 1351 |
* and drain one more time and free fuse devices. Freeing fuse * devices will drop their reference on fuse_conn and that in * turn will drop its reference on virtio_fs object. */ virtio_fs_stop_all_queues(vfs); virtio_fs_drain_all_queues(vfs); virtio_fs_free_devs(vfs); } |
fcee216be fuse: split fuse_... |
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 |
static void virtio_kill_sb(struct super_block *sb) { struct fuse_mount *fm = get_fuse_mount_super(sb); bool last; /* If mount failed, we can still be called without any fc */ if (fm) { last = fuse_mount_remove(fm); if (last) virtio_fs_conn_destroy(fm); } kill_anon_super(sb); } |
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1365 1366 1367 |
static int virtio_fs_test_super(struct super_block *sb, struct fs_context *fsc) { |
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1368 1369 |
struct fuse_mount *fsc_fm = fsc->s_fs_info; struct fuse_mount *sb_fm = get_fuse_mount_super(sb); |
a62a8ef9d virtio-fs: add vi... |
1370 |
|
fcee216be fuse: split fuse_... |
1371 |
return fsc_fm->fc->iq.priv == sb_fm->fc->iq.priv; |
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1372 1373 1374 1375 1376 1377 1378 1379 1380 |
} static int virtio_fs_set_super(struct super_block *sb, struct fs_context *fsc) { int err; err = get_anon_bdev(&sb->s_dev); if (!err) |
fcee216be fuse: split fuse_... |
1381 |
fuse_mount_get(fsc->s_fs_info); |
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1382 1383 1384 1385 1386 1387 1388 1389 1390 |
return err; } static int virtio_fs_get_tree(struct fs_context *fsc) { struct virtio_fs *fs; struct super_block *sb; struct fuse_conn *fc; |
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1391 |
struct fuse_mount *fm; |
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1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 |
int err; /* This gets a reference on virtio_fs object. This ptr gets installed * in fc->iq->priv. Once fuse_conn is going away, it calls ->put() * to drop the reference to this object. */ fs = virtio_fs_find_instance(fsc->source); if (!fs) { pr_info("virtio-fs: tag <%s> not found ", fsc->source); return -EINVAL; } fc = kzalloc(sizeof(struct fuse_conn), GFP_KERNEL); if (!fc) { mutex_lock(&virtio_fs_mutex); virtio_fs_put(fs); mutex_unlock(&virtio_fs_mutex); return -ENOMEM; } |
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1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 |
fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL); if (!fm) { mutex_lock(&virtio_fs_mutex); virtio_fs_put(fs); mutex_unlock(&virtio_fs_mutex); kfree(fc); return -ENOMEM; } fuse_conn_init(fc, fm, get_user_ns(current_user_ns()), &virtio_fs_fiq_ops, fs); |
a62a8ef9d virtio-fs: add vi... |
1423 1424 |
fc->release = fuse_free_conn; fc->delete_stale = true; |
bf109c640 fuse: implement c... |
1425 |
fc->auto_submounts = true; |
a62a8ef9d virtio-fs: add vi... |
1426 |
|
fcee216be fuse: split fuse_... |
1427 |
fsc->s_fs_info = fm; |
a62a8ef9d virtio-fs: add vi... |
1428 |
sb = sget_fc(fsc, virtio_fs_test_super, virtio_fs_set_super); |
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1429 |
fuse_mount_put(fm); |
a62a8ef9d virtio-fs: add vi... |
1430 1431 1432 1433 |
if (IS_ERR(sb)) return PTR_ERR(sb); if (!sb->s_root) { |
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1434 |
err = virtio_fs_fill_super(sb, fsc); |
a62a8ef9d virtio-fs: add vi... |
1435 |
if (err) { |
941327d40 virtiofs fix leak... |
1436 1437 |
fuse_mount_put(fm); sb->s_fs_info = NULL; |
a62a8ef9d virtio-fs: add vi... |
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
deactivate_locked_super(sb); return err; } sb->s_flags |= SB_ACTIVE; } WARN_ON(fsc->root); fsc->root = dget(sb->s_root); return 0; } static const struct fs_context_operations virtio_fs_context_ops = { |
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1451 1452 |
.free = virtio_fs_free_fc, .parse_param = virtio_fs_parse_param, |
a62a8ef9d virtio-fs: add vi... |
1453 1454 1455 1456 1457 |
.get_tree = virtio_fs_get_tree, }; static int virtio_fs_init_fs_context(struct fs_context *fsc) { |
1dd539577 virtiofs: add a m... |
1458 1459 1460 1461 1462 1463 |
struct fuse_fs_context *ctx; ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL); if (!ctx) return -ENOMEM; fsc->fs_private = ctx; |
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1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 |
fsc->ops = &virtio_fs_context_ops; return 0; } static struct file_system_type virtio_fs_type = { .owner = THIS_MODULE, .name = "virtiofs", .init_fs_context = virtio_fs_init_fs_context, .kill_sb = virtio_kill_sb, }; static int __init virtio_fs_init(void) { int ret; ret = register_virtio_driver(&virtio_fs_driver); if (ret < 0) return ret; ret = register_filesystem(&virtio_fs_type); if (ret < 0) { unregister_virtio_driver(&virtio_fs_driver); return ret; } return 0; } module_init(virtio_fs_init); static void __exit virtio_fs_exit(void) { unregister_filesystem(&virtio_fs_type); unregister_virtio_driver(&virtio_fs_driver); } module_exit(virtio_fs_exit); MODULE_AUTHOR("Stefan Hajnoczi <stefanha@redhat.com>"); MODULE_DESCRIPTION("Virtio Filesystem"); MODULE_LICENSE("GPL"); MODULE_ALIAS_FS(KBUILD_MODNAME); MODULE_DEVICE_TABLE(virtio, id_table); |