|
|
/*
FUSE: Filesystem in Userspace Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPLv2. See the file COPYING.LIB*/
/* For pthread_rwlock_t */#define _GNU_SOURCE
#include "config.h"
#include "fuse_i.h"
#include "fuse_lowlevel.h"
#include "fuse_opt.h"
#include "fuse_misc.h"
#include "fuse_kernel.h"
#include "fuse_dirents.h"
#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <time.h>
#include <unistd.h>
#define FUSE_NODE_SLAB 1
#ifndef MAP_ANONYMOUS
#undef FUSE_NODE_SLAB
#endif
#define FUSE_DEFAULT_INTR_SIGNAL SIGUSR1
#define FUSE_UNKNOWN_INO UINT64_MAX
#define OFFSET_MAX 0x7fffffffffffffffLL
#define NODE_TABLE_MIN_SIZE 8192
struct fuse_config{ unsigned int uid; unsigned int gid; unsigned int umask; int remember; int debug; int use_ino; int set_mode; int set_uid; int set_gid; int intr; int intr_signal; int help; int threads;};
struct fuse_fs{ struct fuse_operations op; void *user_data; int debug;};
struct lock_queue_element{ struct lock_queue_element *next; pthread_cond_t cond; fuse_ino_t nodeid1; const char *name1; char **path1; struct node **wnode1; fuse_ino_t nodeid2; const char *name2; char **path2; struct node **wnode2; int err; bool first_locked : 1; bool second_locked : 1; bool done : 1;};
struct node_table{ struct node **array; size_t use; size_t size; size_t split;};
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \ (type *)( (char *)__mptr - offsetof(type,member) );})
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
struct list_head{ struct list_head *next; struct list_head *prev;};
struct node_slab{ struct list_head list; /* must be the first member */ struct list_head freelist; int used;};
struct fuse{ struct fuse_session *se; struct node_table name_table; struct node_table id_table; struct list_head lru_table; fuse_ino_t ctr; uint64_t generation; unsigned int hidectr; pthread_mutex_t lock; struct fuse_config conf; int intr_installed; struct fuse_fs *fs; struct lock_queue_element *lockq; int pagesize; struct list_head partial_slabs; struct list_head full_slabs; pthread_t prune_thread;};
struct lock{ int type; off_t start; off_t end; pid_t pid; uint64_t owner; struct lock *next;};
struct node{ struct node *name_next; struct node *id_next; fuse_ino_t nodeid; uint64_t generation; int refctr; struct node *parent; char *name; uint64_t nlookup; int open_count; struct lock *locks; uint64_t hidden_fh; char is_hidden; int treelock; struct stat stat_cache; char stat_cache_valid; char inline_name[32];};
#define TREELOCK_WRITE -1
#define TREELOCK_WAIT_OFFSET INT_MIN
struct node_lru{ struct node node; struct list_head lru; struct timespec forget_time;};
struct fuse_dh{ pthread_mutex_t lock; uint64_t fh; fuse_dirents_t d;};
struct fuse_context_i{ struct fuse_context ctx; fuse_req_t req;};
static pthread_key_t fuse_context_key;static pthread_mutex_t fuse_context_lock = PTHREAD_MUTEX_INITIALIZER;static int fuse_context_ref;
staticvoidinit_list_head(struct list_head *list){ list->next = list; list->prev = list;}
staticintlist_empty(const struct list_head *head){ return head->next == head;}
staticvoidlist_add(struct list_head *new, struct list_head *prev, struct list_head *next){ next->prev = new; new->next = next; new->prev = prev; prev->next = new;}
staticinlinevoidlist_add_head(struct list_head *new, struct list_head *head){ list_add(new, head, head->next);}
staticinlinevoidlist_add_tail(struct list_head *new, struct list_head *head){ list_add(new, head->prev, head);}
staticinlinevoidlist_del(struct list_head *entry){ struct list_head *prev = entry->prev; struct list_head *next = entry->next;
next->prev = prev; prev->next = next;}
staticinlineintlru_enabled(struct fuse *f){ return f->conf.remember > 0;}
staticstructnode_lru*node_lru(struct node *node){ return (struct node_lru*)node;}
staticsize_tget_node_size(struct fuse *f){ if (lru_enabled(f)) return sizeof(struct node_lru); else return sizeof(struct node);}
#ifdef FUSE_NODE_SLAB
staticstruct node_slab*list_to_slab(struct list_head *head){ return (struct node_slab *) head;}
staticstruct node_slab*node_to_slab(struct fuse *f, struct node *node){ return (struct node_slab *) (((uintptr_t) node) & ~((uintptr_t) f->pagesize - 1));}
staticintalloc_slab(struct fuse *f){ void *mem; struct node_slab *slab; char *start; size_t num; size_t i; size_t node_size = get_node_size(f);
mem = mmap(NULL, f->pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (mem == MAP_FAILED) return -1;
slab = mem; init_list_head(&slab->freelist); slab->used = 0; num = (f->pagesize - sizeof(struct node_slab)) / node_size;
start = (char *) mem + f->pagesize - num * node_size; for (i = 0; i < num; i++) { struct list_head *n;
n = (struct list_head *) (start + i * node_size); list_add_tail(n, &slab->freelist); } list_add_tail(&slab->list, &f->partial_slabs);
return 0;}
staticstruct node*alloc_node(struct fuse *f){ struct node_slab *slab; struct list_head *node;
if (list_empty(&f->partial_slabs)) { int res = alloc_slab(f); if (res != 0) return NULL; } slab = list_to_slab(f->partial_slabs.next); slab->used++; node = slab->freelist.next; list_del(node); if (list_empty(&slab->freelist)) { list_del(&slab->list); list_add_tail(&slab->list, &f->full_slabs); } memset(node, 0, sizeof(struct node));
return (struct node *) node;}
staticvoidfree_slab(struct fuse *f, struct node_slab *slab){ int res;
list_del(&slab->list); res = munmap(slab, f->pagesize); if (res == -1) fprintf(stderr, "fuse warning: munmap(%p) failed\n", slab);}
staticvoidfree_node_mem(struct fuse *f, struct node *node){ struct node_slab *slab = node_to_slab(f, node); struct list_head *n = (struct list_head *) node;
slab->used--; if (slab->used) { if (list_empty(&slab->freelist)) { list_del(&slab->list); list_add_tail(&slab->list, &f->partial_slabs); } list_add_head(n, &slab->freelist); } else { free_slab(f, slab); }}#else
staticstruct node*alloc_node(struct fuse *f){ return (struct node *) calloc(1, get_node_size(f));}
staticvoidfree_node_mem(struct fuse *f, struct node *node){ (void) f; free(node);}#endif
staticsize_tid_hash(struct fuse *f, fuse_ino_t ino){ uint64_t hash = ((uint32_t) ino * 2654435761U) % f->id_table.size; uint64_t oldhash = hash % (f->id_table.size / 2);
if (oldhash >= f->id_table.split) return oldhash; else return hash;}
staticstruct node*get_node_nocheck(struct fuse *f, fuse_ino_t nodeid){ size_t hash = id_hash(f, nodeid); struct node *node;
for (node = f->id_table.array[hash]; node != NULL; node = node->id_next) if (node->nodeid == nodeid) return node;
return NULL;}
staticstruct node*get_node(struct fuse *f, const fuse_ino_t nodeid){ struct node *node = get_node_nocheck(f, nodeid);
if(!node) { fprintf(stderr, "fuse internal error: node %llu not found\n", (unsigned long long) nodeid); abort(); }
return node;}
static void curr_time(struct timespec *now);static double diff_timespec(const struct timespec *t1, const struct timespec *t2);
staticvoidremove_node_lru(struct node *node){ struct node_lru *lnode = node_lru(node); list_del(&lnode->lru); init_list_head(&lnode->lru);}
staticvoidset_forget_time(struct fuse *f, struct node *node){ struct node_lru *lnode = node_lru(node);
list_del(&lnode->lru); list_add_tail(&lnode->lru, &f->lru_table); curr_time(&lnode->forget_time);}
staticvoidfree_node(struct fuse *f_, struct node *node_){ if(node_->name != node_->inline_name) free(node_->name);
if(node_->is_hidden) fuse_fs_free_hide(f_->fs,node_->hidden_fh);
free_node_mem(f_,node_);}
staticvoidnode_table_reduce(struct node_table *t){ size_t newsize = t->size / 2; void *newarray;
if (newsize < NODE_TABLE_MIN_SIZE) return;
newarray = realloc(t->array, sizeof(struct node *) * newsize); if (newarray != NULL) t->array = newarray;
t->size = newsize; t->split = t->size / 2;}
staticvoidremerge_id(struct fuse *f){ struct node_table *t = &f->id_table; int iter;
if (t->split == 0) node_table_reduce(t);
for (iter = 8; t->split > 0 && iter; iter--) { struct node **upper;
t->split--; upper = &t->array[t->split + t->size / 2]; if (*upper) { struct node **nodep;
for (nodep = &t->array[t->split]; *nodep; nodep = &(*nodep)->id_next);
*nodep = *upper; *upper = NULL; break; } }}
staticvoidunhash_id(struct fuse *f, struct node *node){ struct node **nodep = &f->id_table.array[id_hash(f, node->nodeid)];
for (; *nodep != NULL; nodep = &(*nodep)->id_next) if (*nodep == node) { *nodep = node->id_next; f->id_table.use--;
if(f->id_table.use < f->id_table.size / 4) remerge_id(f); return; }}
static int node_table_resize(struct node_table *t){ size_t newsize = t->size * 2; void *newarray;
newarray = realloc(t->array, sizeof(struct node *) * newsize); if (newarray == NULL) return -1;
t->array = newarray; memset(t->array + t->size, 0, t->size * sizeof(struct node *)); t->size = newsize; t->split = 0;
return 0;}
static void rehash_id(struct fuse *f){ struct node_table *t = &f->id_table; struct node **nodep; struct node **next; size_t hash;
if (t->split == t->size / 2) return;
hash = t->split; t->split++; for (nodep = &t->array[hash]; *nodep != NULL; nodep = next) { struct node *node = *nodep; size_t newhash = id_hash(f, node->nodeid);
if (newhash != hash) { next = nodep; *nodep = node->id_next; node->id_next = t->array[newhash]; t->array[newhash] = node; } else { next = &node->id_next; } } if (t->split == t->size / 2) node_table_resize(t);}
static void hash_id(struct fuse *f, struct node *node){ size_t hash = id_hash(f, node->nodeid); node->id_next = f->id_table.array[hash]; f->id_table.array[hash] = node; f->id_table.use++;
if (f->id_table.use >= f->id_table.size / 2) rehash_id(f);}
static size_t name_hash(struct fuse *f, fuse_ino_t parent, const char *name){ uint64_t hash = parent; uint64_t oldhash;
for (; *name; name++) hash = hash * 31 + (unsigned char) *name;
hash %= f->name_table.size; oldhash = hash % (f->name_table.size / 2); if (oldhash >= f->name_table.split) return oldhash; else return hash;}
static void unref_node(struct fuse *f, struct node *node);
static void remerge_name(struct fuse *f){ struct node_table *t = &f->name_table; int iter;
if (t->split == 0) node_table_reduce(t);
for (iter = 8; t->split > 0 && iter; iter--) { struct node **upper;
t->split--; upper = &t->array[t->split + t->size / 2]; if (*upper) { struct node **nodep;
for (nodep = &t->array[t->split]; *nodep; nodep = &(*nodep)->name_next);
*nodep = *upper; *upper = NULL; break; } }}
static void unhash_name(struct fuse *f, struct node *node){ if (node->name) { size_t hash = name_hash(f, node->parent->nodeid, node->name); struct node **nodep = &f->name_table.array[hash];
for (; *nodep != NULL; nodep = &(*nodep)->name_next) if (*nodep == node) { *nodep = node->name_next; node->name_next = NULL; unref_node(f, node->parent); if (node->name != node->inline_name) free(node->name); node->name = NULL; node->parent = NULL; f->name_table.use--;
if (f->name_table.use < f->name_table.size / 4) remerge_name(f); return; } fprintf(stderr, "fuse internal error: unable to unhash node: %llu\n", (unsigned long long) node->nodeid); abort(); }}
static void rehash_name(struct fuse *f){ struct node_table *t = &f->name_table; struct node **nodep; struct node **next; size_t hash;
if (t->split == t->size / 2) return;
hash = t->split; t->split++; for (nodep = &t->array[hash]; *nodep != NULL; nodep = next) { struct node *node = *nodep; size_t newhash = name_hash(f, node->parent->nodeid, node->name);
if (newhash != hash) { next = nodep; *nodep = node->name_next; node->name_next = t->array[newhash]; t->array[newhash] = node; } else { next = &node->name_next; } } if (t->split == t->size / 2) node_table_resize(t);}
static int hash_name(struct fuse *f, struct node *node, fuse_ino_t parentid, const char *name){ size_t hash = name_hash(f, parentid, name); struct node *parent = get_node(f, parentid); if (strlen(name) < sizeof(node->inline_name)) { strcpy(node->inline_name, name); node->name = node->inline_name; } else { node->name = strdup(name); if (node->name == NULL) return -1; }
parent->refctr ++; node->parent = parent; node->name_next = f->name_table.array[hash]; f->name_table.array[hash] = node; f->name_table.use++;
if (f->name_table.use >= f->name_table.size / 2) rehash_name(f);
return 0;}
static void delete_node(struct fuse *f, struct node *node){ if (f->conf.debug) fprintf(stderr, "DELETE: %llu\n", (unsigned long long) node->nodeid);
assert(node->treelock == 0); unhash_name(f, node); if (lru_enabled(f)) remove_node_lru(node); unhash_id(f, node); free_node(f, node);}
static void unref_node(struct fuse *f, struct node *node){ assert(node->refctr > 0); node->refctr --; if (!node->refctr) delete_node(f, node);}
staticuint64_trand64(void){ uint64_t rv;
rv = rand(); rv <<= 32; rv |= rand();
return rv;}
staticfuse_ino_tnext_id(struct fuse *f){ do { f->ctr = ((f->ctr + 1) & UINT64_MAX); if(f->ctr == 0) f->generation++; } while((f->ctr == 0) || (f->ctr == FUSE_UNKNOWN_INO) || (get_node_nocheck(f, f->ctr) != NULL));
return f->ctr;}
static struct node *lookup_node(struct fuse *f, fuse_ino_t parent, const char *name){ size_t hash = name_hash(f, parent, name); struct node *node;
for (node = f->name_table.array[hash]; node != NULL; node = node->name_next) if (node->parent->nodeid == parent && strcmp(node->name, name) == 0) return node;
return NULL;}
static void inc_nlookup(struct node *node){ if (!node->nlookup) node->refctr++; node->nlookup++;}
static struct node *find_node(struct fuse *f, fuse_ino_t parent, const char *name){ struct node *node;
pthread_mutex_lock(&f->lock); if (!name) node = get_node(f, parent); else node = lookup_node(f, parent, name); if (node == NULL) { node = alloc_node(f); if (node == NULL) goto out_err;
node->nodeid = next_id(f); node->generation = f->generation; if (f->conf.remember) inc_nlookup(node);
if (hash_name(f, node, parent, name) == -1) { free_node(f, node); node = NULL; goto out_err; } hash_id(f, node); if (lru_enabled(f)) { struct node_lru *lnode = node_lru(node); init_list_head(&lnode->lru); } } else if (lru_enabled(f) && node->nlookup == 1) { remove_node_lru(node); } inc_nlookup(node); out_err: pthread_mutex_unlock(&f->lock); return node;}
static char *add_name(char **buf, unsigned *bufsize, char *s, const char *name){ size_t len = strlen(name);
if (s - len <= *buf) { unsigned pathlen = *bufsize - (s - *buf); unsigned newbufsize = *bufsize; char *newbuf;
while (newbufsize < pathlen + len + 1) { if (newbufsize >= 0x80000000) newbufsize = 0xffffffff; else newbufsize *= 2; }
newbuf = realloc(*buf, newbufsize); if (newbuf == NULL) return NULL;
*buf = newbuf; s = newbuf + newbufsize - pathlen; memmove(s, newbuf + *bufsize - pathlen, pathlen); *bufsize = newbufsize; } s -= len; strncpy(s, name, len); s--; *s = '/';
return s;}
static void unlock_path(struct fuse *f, fuse_ino_t nodeid, struct node *wnode, struct node *end){ struct node *node;
if (wnode) { assert(wnode->treelock == TREELOCK_WRITE); wnode->treelock = 0; }
for (node = get_node(f, nodeid); node != end && node->nodeid != FUSE_ROOT_ID; node = node->parent) { assert(node->treelock != 0); assert(node->treelock != TREELOCK_WAIT_OFFSET); assert(node->treelock != TREELOCK_WRITE); node->treelock--; if (node->treelock == TREELOCK_WAIT_OFFSET) node->treelock = 0; }}
static int try_get_path(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnodep, bool need_lock){ unsigned bufsize = 256; char *buf; char *s; struct node *node; struct node *wnode = NULL; int err;
*path = NULL;
err = -ENOMEM; buf = malloc(bufsize); if (buf == NULL) goto out_err;
s = buf + bufsize - 1; *s = '\0';
if (name != NULL) { s = add_name(&buf, &bufsize, s, name); err = -ENOMEM; if (s == NULL) goto out_free; }
if (wnodep) { assert(need_lock); wnode = lookup_node(f, nodeid, name); if (wnode) { if (wnode->treelock != 0) { if (wnode->treelock > 0) wnode->treelock += TREELOCK_WAIT_OFFSET; err = -EAGAIN; goto out_free; } wnode->treelock = TREELOCK_WRITE; } }
for (node = get_node(f, nodeid); node->nodeid != FUSE_ROOT_ID; node = node->parent) { err = -ENOENT; if (node->name == NULL || node->parent == NULL) goto out_unlock;
err = -ENOMEM; s = add_name(&buf, &bufsize, s, node->name); if (s == NULL) goto out_unlock;
if (need_lock) { err = -EAGAIN; if (node->treelock < 0) goto out_unlock;
node->treelock++; } }
if (s[0]) memmove(buf, s, bufsize - (s - buf)); else strcpy(buf, "/");
*path = buf; if (wnodep) *wnodep = wnode;
return 0;
out_unlock: if (need_lock) unlock_path(f, nodeid, wnode, node); out_free: free(buf);
out_err: return err;}
static void queue_element_unlock(struct fuse *f, struct lock_queue_element *qe){ struct node *wnode;
if (qe->first_locked) { wnode = qe->wnode1 ? *qe->wnode1 : NULL; unlock_path(f, qe->nodeid1, wnode, NULL); qe->first_locked = false; } if (qe->second_locked) { wnode = qe->wnode2 ? *qe->wnode2 : NULL; unlock_path(f, qe->nodeid2, wnode, NULL); qe->second_locked = false; }}
static void queue_element_wakeup(struct fuse *f, struct lock_queue_element *qe){ int err; bool first = (qe == f->lockq);
if (!qe->path1) { /* Just waiting for it to be unlocked */ if (get_node(f, qe->nodeid1)->treelock == 0) pthread_cond_signal(&qe->cond);
return; }
if (!qe->first_locked) { err = try_get_path(f, qe->nodeid1, qe->name1, qe->path1, qe->wnode1, true); if (!err) qe->first_locked = true; else if (err != -EAGAIN) goto err_unlock; } if (!qe->second_locked && qe->path2) { err = try_get_path(f, qe->nodeid2, qe->name2, qe->path2, qe->wnode2, true); if (!err) qe->second_locked = true; else if (err != -EAGAIN) goto err_unlock; }
if (qe->first_locked && (qe->second_locked || !qe->path2)) { err = 0; goto done; }
/*
* Only let the first element be partially locked otherwise there could * be a deadlock. * * But do allow the first element to be partially locked to prevent * starvation. */ if (!first) queue_element_unlock(f, qe);
/* keep trying */ return;
err_unlock: queue_element_unlock(f, qe); done: qe->err = err; qe->done = true; pthread_cond_signal(&qe->cond);}
static void wake_up_queued(struct fuse *f){ struct lock_queue_element *qe;
for (qe = f->lockq; qe != NULL; qe = qe->next) queue_element_wakeup(f, qe);}
static void debug_path(struct fuse *f, const char *msg, fuse_ino_t nodeid, const char *name, bool wr){ if (f->conf.debug) { struct node *wnode = NULL;
if (wr) wnode = lookup_node(f, nodeid, name);
if (wnode) fprintf(stderr, "%s %li (w)\n", msg, wnode->nodeid); else fprintf(stderr, "%s %li\n", msg, nodeid); }}
static void queue_path(struct fuse *f, struct lock_queue_element *qe){ struct lock_queue_element **qp;
qe->done = false; qe->first_locked = false; qe->second_locked = false; pthread_cond_init(&qe->cond, NULL); qe->next = NULL; for (qp = &f->lockq; *qp != NULL; qp = &(*qp)->next); *qp = qe;}
static void dequeue_path(struct fuse *f, struct lock_queue_element *qe){ struct lock_queue_element **qp;
pthread_cond_destroy(&qe->cond); for (qp = &f->lockq; *qp != qe; qp = &(*qp)->next); *qp = qe->next;}
static int wait_path(struct fuse *f, struct lock_queue_element *qe){ queue_path(f, qe);
do { pthread_cond_wait(&qe->cond, &f->lock); } while (!qe->done);
dequeue_path(f, qe);
return qe->err;}
static int get_path_common(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnode){ int err;
pthread_mutex_lock(&f->lock); err = try_get_path(f, nodeid, name, path, wnode, true); if (err == -EAGAIN) { struct lock_queue_element qe = { .nodeid1 = nodeid, .name1 = name, .path1 = path, .wnode1 = wnode, }; debug_path(f, "QUEUE PATH", nodeid, name, !!wnode); err = wait_path(f, &qe); debug_path(f, "DEQUEUE PATH", nodeid, name, !!wnode); } pthread_mutex_unlock(&f->lock);
return err;}
static int get_path(struct fuse *f, fuse_ino_t nodeid, char **path){ return get_path_common(f, nodeid, NULL, path, NULL);}
static int get_path_name(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path){ return get_path_common(f, nodeid, name, path, NULL);}
static int get_path_wrlock(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnode){ return get_path_common(f, nodeid, name, path, wnode);}
static int try_get_path2(struct fuse *f, fuse_ino_t nodeid1, const char *name1, fuse_ino_t nodeid2, const char *name2, char **path1, char **path2, struct node **wnode1, struct node **wnode2){ int err;
/* FIXME: locking two paths needs deadlock checking */ err = try_get_path(f, nodeid1, name1, path1, wnode1, true); if (!err) { err = try_get_path(f, nodeid2, name2, path2, wnode2, true); if (err) { struct node *wn1 = wnode1 ? *wnode1 : NULL;
unlock_path(f, nodeid1, wn1, NULL); free(*path1); } } return err;}
static int get_path2(struct fuse *f, fuse_ino_t nodeid1, const char *name1, fuse_ino_t nodeid2, const char *name2, char **path1, char **path2, struct node **wnode1, struct node **wnode2){ int err;
pthread_mutex_lock(&f->lock); err = try_get_path2(f, nodeid1, name1, nodeid2, name2, path1, path2, wnode1, wnode2); if (err == -EAGAIN) { struct lock_queue_element qe = { .nodeid1 = nodeid1, .name1 = name1, .path1 = path1, .wnode1 = wnode1, .nodeid2 = nodeid2, .name2 = name2, .path2 = path2, .wnode2 = wnode2, };
debug_path(f, "QUEUE PATH1", nodeid1, name1, !!wnode1); debug_path(f, " PATH2", nodeid2, name2, !!wnode2); err = wait_path(f, &qe); debug_path(f, "DEQUEUE PATH1", nodeid1, name1, !!wnode1); debug_path(f, " PATH2", nodeid2, name2, !!wnode2); } pthread_mutex_unlock(&f->lock);
return err;}
static void free_path_wrlock(struct fuse *f, fuse_ino_t nodeid, struct node *wnode, char *path){ pthread_mutex_lock(&f->lock); unlock_path(f, nodeid, wnode, NULL); if (f->lockq) wake_up_queued(f); pthread_mutex_unlock(&f->lock); free(path);}
static void free_path(struct fuse *f, fuse_ino_t nodeid, char *path){ if (path) free_path_wrlock(f, nodeid, NULL, path);}
static void free_path2(struct fuse *f, fuse_ino_t nodeid1, fuse_ino_t nodeid2, struct node *wnode1, struct node *wnode2, char *path1, char *path2){ pthread_mutex_lock(&f->lock); unlock_path(f, nodeid1, wnode1, NULL); unlock_path(f, nodeid2, wnode2, NULL); wake_up_queued(f); pthread_mutex_unlock(&f->lock); free(path1); free(path2);}
staticvoidforget_node(struct fuse *f, const fuse_ino_t nodeid, const uint64_t nlookup){ struct node *node;
if(nodeid == FUSE_ROOT_ID) return;
pthread_mutex_lock(&f->lock); node = get_node(f, nodeid);
/*
* Node may still be locked due to interrupt idiocy in open, * create and opendir */ while(node->nlookup == nlookup && node->treelock) { struct lock_queue_element qe = { .nodeid1 = nodeid, };
debug_path(f, "QUEUE PATH (forget)", nodeid, NULL, false); queue_path(f, &qe);
do { pthread_cond_wait(&qe.cond, &f->lock); } while((node->nlookup == nlookup) && node->treelock);
dequeue_path(f, &qe); debug_path(f, "DEQUEUE_PATH (forget)", nodeid, NULL, false); }
assert(node->nlookup >= nlookup); node->nlookup -= nlookup; if(!node->nlookup) unref_node(f, node); else if(lru_enabled(f) && node->nlookup == 1) set_forget_time(f, node);
pthread_mutex_unlock(&f->lock);}
static void unlink_node(struct fuse *f, struct node *node){ if (f->conf.remember) { assert(node->nlookup > 1); node->nlookup--; } unhash_name(f, node);}
static void remove_node(struct fuse *f, fuse_ino_t dir, const char *name){ struct node *node;
pthread_mutex_lock(&f->lock); node = lookup_node(f, dir, name); if (node != NULL) unlink_node(f, node); pthread_mutex_unlock(&f->lock);}
static int rename_node(struct fuse *f, fuse_ino_t olddir, const char *oldname, fuse_ino_t newdir, const char *newname){ struct node *node; struct node *newnode; int err = 0;
pthread_mutex_lock(&f->lock); node = lookup_node(f, olddir, oldname); newnode = lookup_node(f, newdir, newname); if (node == NULL) goto out;
if (newnode != NULL) unlink_node(f, newnode);
unhash_name(f, node); if (hash_name(f, node, newdir, newname) == -1) { err = -ENOMEM; goto out; }
out: pthread_mutex_unlock(&f->lock); return err;}
static void set_stat(struct fuse *f, fuse_ino_t nodeid, struct stat *stbuf){ if (!f->conf.use_ino) stbuf->st_ino = nodeid; if (f->conf.set_mode) stbuf->st_mode = (stbuf->st_mode & S_IFMT) | (0777 & ~f->conf.umask); if (f->conf.set_uid) stbuf->st_uid = f->conf.uid; if (f->conf.set_gid) stbuf->st_gid = f->conf.gid;}
static struct fuse *req_fuse(fuse_req_t req){ return (struct fuse *) fuse_req_userdata(req);}
static void fuse_intr_sighandler(int sig){ (void) sig; /* Nothing to do */}
struct fuse_intr_data { pthread_t id; pthread_cond_t cond; int finished;};
static void fuse_interrupt(fuse_req_t req, void *d_){ struct fuse_intr_data *d = d_; struct fuse *f = req_fuse(req);
if (d->id == pthread_self()) return;
pthread_mutex_lock(&f->lock); while (!d->finished) { struct timeval now; struct timespec timeout;
pthread_kill(d->id, f->conf.intr_signal); gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + 1; timeout.tv_nsec = now.tv_usec * 1000; pthread_cond_timedwait(&d->cond, &f->lock, &timeout); } pthread_mutex_unlock(&f->lock);}
static void fuse_do_finish_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d){ pthread_mutex_lock(&f->lock); d->finished = 1; pthread_cond_broadcast(&d->cond); pthread_mutex_unlock(&f->lock); fuse_req_interrupt_func(req, NULL, NULL); pthread_cond_destroy(&d->cond);}
static void fuse_do_prepare_interrupt(fuse_req_t req, struct fuse_intr_data *d){ d->id = pthread_self(); pthread_cond_init(&d->cond, NULL); d->finished = 0; fuse_req_interrupt_func(req, fuse_interrupt, d);}
static inline void fuse_finish_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d){ if (f->conf.intr) fuse_do_finish_interrupt(f, req, d);}
static inline void fuse_prepare_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d){ if (f->conf.intr) fuse_do_prepare_interrupt(req, d);}
intfuse_fs_getattr(struct fuse_fs *fs, const char *path, struct stat *buf, fuse_timeouts_t *timeout){ if(fs->op.getattr == NULL) return -ENOSYS;
if(fs->debug) fprintf(stderr,"getattr %s\n",path);
fuse_get_context()->private_data = fs->user_data;
return fs->op.getattr(path,buf,timeout);}
intfuse_fs_fgetattr(struct fuse_fs *fs, struct stat *buf, struct fuse_file_info *fi, fuse_timeouts_t *timeout){ if(fs->op.fgetattr == NULL) return -ENOSYS;
fuse_get_context()->private_data = fs->user_data; if(fs->debug) fprintf(stderr,"fgetattr[%llu]\n",(unsigned long long)fi->fh);
return fs->op.fgetattr(buf,fi,timeout);}
intfuse_fs_rename(struct fuse_fs *fs, const char *oldpath, const char *newpath){ fuse_get_context()->private_data = fs->user_data;
if(fs->op.rename) return fs->op.rename(oldpath, newpath);
return -ENOSYS;}
intfuse_fs_prepare_hide(struct fuse_fs *fs_, const char *path_, uint64_t *fh_){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.prepare_hide) return fs_->op.prepare_hide(path_,fh_);
return -ENOSYS;}
intfuse_fs_free_hide(struct fuse_fs *fs_, uint64_t fh_){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.free_hide) return fs_->op.free_hide(fh_);
return -ENOSYS;}
int fuse_fs_unlink(struct fuse_fs *fs, const char *path){ fuse_get_context()->private_data = fs->user_data; if (fs->op.unlink) { if (fs->debug) fprintf(stderr, "unlink %s\n", path);
return fs->op.unlink(path); } else { return -ENOSYS; }}
int fuse_fs_rmdir(struct fuse_fs *fs, const char *path){ fuse_get_context()->private_data = fs->user_data; if (fs->op.rmdir) { if (fs->debug) fprintf(stderr, "rmdir %s\n", path);
return fs->op.rmdir(path); } else { return -ENOSYS; }}
int fuse_fs_symlink(struct fuse_fs *fs, const char *linkname, const char *path){ fuse_get_context()->private_data = fs->user_data; if (fs->op.symlink) { if (fs->debug) fprintf(stderr, "symlink %s %s\n", linkname, path);
return fs->op.symlink(linkname, path); } else { return -ENOSYS; }}
int fuse_fs_link(struct fuse_fs *fs, const char *oldpath, const char *newpath){ fuse_get_context()->private_data = fs->user_data; if (fs->op.link) { if (fs->debug) fprintf(stderr, "link %s %s\n", oldpath, newpath);
return fs->op.link(oldpath, newpath); } else { return -ENOSYS; }}
int fuse_fs_release(struct fuse_fs *fs, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.release) { if (fs->debug) fprintf(stderr, "release%s[%llu] flags: 0x%x\n", fi->flush ? "+flush" : "", (unsigned long long) fi->fh, fi->flags);
return fs->op.release(fi); } else { return 0; }}
int fuse_fs_opendir(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.opendir) { int err;
if (fs->debug) fprintf(stderr, "opendir flags: 0x%x %s\n", fi->flags, path);
err = fs->op.opendir(path,fi);
if (fs->debug && !err) fprintf(stderr, " opendir[%lli] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path);
return err; } else { return 0; }}
int fuse_fs_open(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.open) { int err;
if (fs->debug) fprintf(stderr, "open flags: 0x%x %s\n", fi->flags, path);
err = fs->op.open(path,fi);
if (fs->debug && !err) fprintf(stderr, " open[%lli] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path);
return err; } else { return 0; }}
static void fuse_free_buf(struct fuse_bufvec *buf){ if (buf != NULL) { size_t i;
for (i = 0; i < buf->count; i++) free(buf->buf[i].mem); free(buf); }}
int fuse_fs_read_buf(struct fuse_fs *fs, struct fuse_bufvec **bufp, size_t size, off_t off, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.read || fs->op.read_buf) { int res;
if (fs->debug) fprintf(stderr, "read[%llu] %zu bytes from %llu flags: 0x%x\n", (unsigned long long) fi->fh, size, (unsigned long long) off, fi->flags);
if (fs->op.read_buf) { res = fs->op.read_buf(bufp, size, off, fi); } else { struct fuse_bufvec *buf; void *mem;
buf = malloc(sizeof(struct fuse_bufvec)); if (buf == NULL) return -ENOMEM;
mem = malloc(size); if (mem == NULL) { free(buf); return -ENOMEM; } *buf = FUSE_BUFVEC_INIT(size); buf->buf[0].mem = mem; *bufp = buf;
res = fs->op.read(mem, size, off, fi); if (res >= 0) buf->buf[0].size = res; }
if (fs->debug && res >= 0) fprintf(stderr, " read[%llu] %zu bytes from %llu\n", (unsigned long long) fi->fh, fuse_buf_size(*bufp), (unsigned long long) off); if (res >= 0 && fuse_buf_size(*bufp) > (int) size) fprintf(stderr, "fuse: read too many bytes\n");
if (res < 0) return res;
return 0; } else { return -ENOSYS; }}
int fuse_fs_read(struct fuse_fs *fs, char *mem, size_t size, off_t off, struct fuse_file_info *fi){ int res; struct fuse_bufvec *buf = NULL;
res = fuse_fs_read_buf(fs, &buf, size, off, fi); if (res == 0) { struct fuse_bufvec dst = FUSE_BUFVEC_INIT(size);
dst.buf[0].mem = mem; res = fuse_buf_copy(&dst, buf, 0); } fuse_free_buf(buf);
return res;}
int fuse_fs_write_buf(struct fuse_fs *fs, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.write_buf || fs->op.write) { int res; size_t size = fuse_buf_size(buf);
assert(buf->idx == 0 && buf->off == 0); if (fs->debug) fprintf(stderr, "write%s[%llu] %zu bytes to %llu flags: 0x%x\n", fi->writepage ? "page" : "", (unsigned long long) fi->fh, size, (unsigned long long) off, fi->flags);
if (fs->op.write_buf) { res = fs->op.write_buf(buf, off, fi); } else { void *mem = NULL; struct fuse_buf *flatbuf; struct fuse_bufvec tmp = FUSE_BUFVEC_INIT(size);
if (buf->count == 1 && !(buf->buf[0].flags & FUSE_BUF_IS_FD)) { flatbuf = &buf->buf[0]; } else { res = -ENOMEM; mem = malloc(size); if (mem == NULL) goto out;
tmp.buf[0].mem = mem; res = fuse_buf_copy(&tmp, buf, 0); if (res <= 0) goto out_free;
tmp.buf[0].size = res; flatbuf = &tmp.buf[0]; }
res = fs->op.write(flatbuf->mem, flatbuf->size, off, fi); out_free: free(mem); } out: if (fs->debug && res >= 0) fprintf(stderr, " write%s[%llu] %u bytes to %llu\n", fi->writepage ? "page" : "", (unsigned long long) fi->fh, res, (unsigned long long) off); if (res > (int) size) fprintf(stderr, "fuse: wrote too many bytes\n");
return res; } else { return -ENOSYS; }}
int fuse_fs_write(struct fuse_fs *fs, const char *mem, size_t size, off_t off, struct fuse_file_info *fi){ struct fuse_bufvec bufv = FUSE_BUFVEC_INIT(size);
bufv.buf[0].mem = (void *) mem;
return fuse_fs_write_buf(fs, &bufv, off, fi);}
int fuse_fs_fsync(struct fuse_fs *fs, int datasync, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.fsync) { if (fs->debug) fprintf(stderr, "fsync[%llu] datasync: %i\n", (unsigned long long) fi->fh, datasync);
return fs->op.fsync(datasync, fi); } else { return -ENOSYS; }}
int fuse_fs_fsyncdir(struct fuse_fs *fs, int datasync, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.fsyncdir) { if (fs->debug) fprintf(stderr, "fsyncdir[%llu] datasync: %i\n", (unsigned long long) fi->fh, datasync);
return fs->op.fsyncdir(datasync, fi); } else { return -ENOSYS; }}
int fuse_fs_flush(struct fuse_fs *fs, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.flush) { if (fs->debug) fprintf(stderr, "flush[%llu]\n", (unsigned long long) fi->fh);
return fs->op.flush(fi); } else { return -ENOSYS; }}
int fuse_fs_statfs(struct fuse_fs *fs, const char *path, struct statvfs *buf){ fuse_get_context()->private_data = fs->user_data; if (fs->op.statfs) { if (fs->debug) fprintf(stderr, "statfs %s\n", path);
return fs->op.statfs(path,buf); } else { buf->f_namemax = 255; buf->f_bsize = 512; return 0; }}
int fuse_fs_releasedir(struct fuse_fs *fs, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.releasedir) { if (fs->debug) fprintf(stderr, "releasedir[%llu] flags: 0x%x\n", (unsigned long long) fi->fh, fi->flags);
return fs->op.releasedir(fi); } else { return 0; }}
intfuse_fs_readdir(struct fuse_fs *fs, struct fuse_file_info *fi, fuse_dirents_t *buf){ if(fs->op.readdir == NULL) return -ENOSYS;
fuse_get_context()->private_data = fs->user_data;
return fs->op.readdir(fi,buf);}
intfuse_fs_readdir_plus(struct fuse_fs *fs_, struct fuse_file_info *ffi_, fuse_dirents_t *buf_){ if(fs_->op.readdir_plus == NULL) return -ENOSYS;
fuse_get_context()->private_data = fs_->user_data;
return fs_->op.readdir_plus(ffi_,buf_);}
int fuse_fs_create(struct fuse_fs *fs, const char *path, mode_t mode, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.create) { int err;
if (fs->debug) fprintf(stderr, "create flags: 0x%x %s 0%o umask=0%03o\n", fi->flags, path, mode, fuse_get_context()->umask);
err = fs->op.create(path, mode, fi);
if (fs->debug && !err) fprintf(stderr, " create[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path);
return err; } else { return -ENOSYS; }}
int fuse_fs_lock(struct fuse_fs *fs, struct fuse_file_info *fi, int cmd, struct flock *lock){ fuse_get_context()->private_data = fs->user_data; if (fs->op.lock) { if (fs->debug) fprintf(stderr, "lock[%llu] %s %s start: %llu len: %llu pid: %llu\n", (unsigned long long) fi->fh, (cmd == F_GETLK ? "F_GETLK" : (cmd == F_SETLK ? "F_SETLK" : (cmd == F_SETLKW ? "F_SETLKW" : "???"))), (lock->l_type == F_RDLCK ? "F_RDLCK" : (lock->l_type == F_WRLCK ? "F_WRLCK" : (lock->l_type == F_UNLCK ? "F_UNLCK" : "???"))), (unsigned long long) lock->l_start, (unsigned long long) lock->l_len, (unsigned long long) lock->l_pid);
return fs->op.lock(fi, cmd, lock); } else { return -ENOSYS; }}
int fuse_fs_flock(struct fuse_fs *fs, struct fuse_file_info *fi, int op){ fuse_get_context()->private_data = fs->user_data; if (fs->op.flock) { if (fs->debug) { int xop = op & ~LOCK_NB;
fprintf(stderr, "lock[%llu] %s%s\n", (unsigned long long) fi->fh, xop == LOCK_SH ? "LOCK_SH" : (xop == LOCK_EX ? "LOCK_EX" : (xop == LOCK_UN ? "LOCK_UN" : "???")), (op & LOCK_NB) ? "|LOCK_NB" : ""); } return fs->op.flock(fi, op); } else { return -ENOSYS; }}
int fuse_fs_chown(struct fuse_fs *fs, const char *path, uid_t uid, gid_t gid){ fuse_get_context()->private_data = fs->user_data; if (fs->op.chown) { if (fs->debug) fprintf(stderr, "chown %s %lu %lu\n", path, (unsigned long) uid, (unsigned long) gid);
return fs->op.chown(path, uid, gid); } else { return -ENOSYS; }}
intfuse_fs_fchown(struct fuse_fs *fs_, const struct fuse_file_info *ffi_, const uid_t uid_, const gid_t gid_){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.fchown) return fs_->op.fchown(ffi_,uid_,gid_);
return -ENOSYS;}
int fuse_fs_truncate(struct fuse_fs *fs, const char *path, off_t size){ fuse_get_context()->private_data = fs->user_data; if (fs->op.truncate) { if (fs->debug) fprintf(stderr, "truncate %s %llu\n", path, (unsigned long long) size);
return fs->op.truncate(path, size); } else { return -ENOSYS; }}
int fuse_fs_ftruncate(struct fuse_fs *fs, off_t size, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->debug) fprintf(stderr, "ftruncate[%llu] %llu\n", (unsigned long long) fi->fh, (unsigned long long) size);
return fs->op.ftruncate(size, fi);}
int fuse_fs_utimens(struct fuse_fs *fs, const char *path, const struct timespec tv[2]){ fuse_get_context()->private_data = fs->user_data; if (fs->op.utimens) { if (fs->debug) fprintf(stderr, "utimens %s %li.%09lu %li.%09lu\n", path, tv[0].tv_sec, tv[0].tv_nsec, tv[1].tv_sec, tv[1].tv_nsec);
return fs->op.utimens(path, tv); } else if(fs->op.utime) { struct utimbuf buf;
if (fs->debug) fprintf(stderr, "utime %s %li %li\n", path, tv[0].tv_sec, tv[1].tv_sec);
buf.actime = tv[0].tv_sec; buf.modtime = tv[1].tv_sec; return fs->op.utime(path, &buf); } else { return -ENOSYS; }}
intfuse_fs_futimens(struct fuse_fs *fs_, const struct fuse_file_info *ffi_, const struct timespec tv_[2]){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.futimens) return fs_->op.futimens(ffi_,tv_);
return -ENOSYS;}
int fuse_fs_access(struct fuse_fs *fs, const char *path, int mask){ fuse_get_context()->private_data = fs->user_data; if (fs->op.access) { if (fs->debug) fprintf(stderr, "access %s 0%o\n", path, mask);
return fs->op.access(path, mask); } else { return -ENOSYS; }}
int fuse_fs_readlink(struct fuse_fs *fs, const char *path, char *buf, size_t len){ fuse_get_context()->private_data = fs->user_data; if (fs->op.readlink) { if (fs->debug) fprintf(stderr, "readlink %s %lu\n", path, (unsigned long) len);
return fs->op.readlink(path, buf, len); } else { return -ENOSYS; }}
int fuse_fs_mknod(struct fuse_fs *fs, const char *path, mode_t mode, dev_t rdev){ fuse_get_context()->private_data = fs->user_data; if (fs->op.mknod) { if (fs->debug) fprintf(stderr, "mknod %s 0%o 0x%llx umask=0%03o\n", path, mode, (unsigned long long) rdev, fuse_get_context()->umask);
return fs->op.mknod(path, mode, rdev); } else { return -ENOSYS; }}
int fuse_fs_mkdir(struct fuse_fs *fs, const char *path, mode_t mode){ fuse_get_context()->private_data = fs->user_data; if (fs->op.mkdir) { if (fs->debug) fprintf(stderr, "mkdir %s 0%o umask=0%03o\n", path, mode, fuse_get_context()->umask);
return fs->op.mkdir(path, mode); } else { return -ENOSYS; }}
int fuse_fs_setxattr(struct fuse_fs *fs, const char *path, const char *name, const char *value, size_t size, int flags){ fuse_get_context()->private_data = fs->user_data; if (fs->op.setxattr) { if (fs->debug) fprintf(stderr, "setxattr %s %s %lu 0x%x\n", path, name, (unsigned long) size, flags);
return fs->op.setxattr(path, name, value, size, flags); } else { return -ENOSYS; }}
int fuse_fs_getxattr(struct fuse_fs *fs, const char *path, const char *name, char *value, size_t size){ fuse_get_context()->private_data = fs->user_data; if (fs->op.getxattr) { if (fs->debug) fprintf(stderr, "getxattr %s %s %lu\n", path, name, (unsigned long) size);
return fs->op.getxattr(path, name, value, size); } else { return -ENOSYS; }}
int fuse_fs_listxattr(struct fuse_fs *fs, const char *path, char *list, size_t size){ fuse_get_context()->private_data = fs->user_data; if (fs->op.listxattr) { if (fs->debug) fprintf(stderr, "listxattr %s %lu\n", path, (unsigned long) size);
return fs->op.listxattr(path, list, size); } else { return -ENOSYS; }}
int fuse_fs_bmap(struct fuse_fs *fs, const char *path, size_t blocksize, uint64_t *idx){ fuse_get_context()->private_data = fs->user_data; if (fs->op.bmap) { if (fs->debug) fprintf(stderr, "bmap %s blocksize: %lu index: %llu\n", path, (unsigned long) blocksize, (unsigned long long) *idx);
return fs->op.bmap(path, blocksize, idx); } else { return -ENOSYS; }}
int fuse_fs_removexattr(struct fuse_fs *fs, const char *path, const char *name){ fuse_get_context()->private_data = fs->user_data; if (fs->op.removexattr) { if (fs->debug) fprintf(stderr, "removexattr %s %s\n", path, name);
return fs->op.removexattr(path, name); } else { return -ENOSYS; }}
int fuse_fs_ioctl(struct fuse_fs *fs, unsigned long cmd, void *arg, struct fuse_file_info *fi, unsigned int flags, void *data, uint32_t *out_size){ fuse_get_context()->private_data = fs->user_data; if (fs->op.ioctl) { if (fs->debug) fprintf(stderr, "ioctl[%llu] 0x%lx flags: 0x%x\n", (unsigned long long) fi->fh, cmd, flags);
return fs->op.ioctl(cmd, arg, fi, flags, data, out_size); } else return -ENOSYS;}
int fuse_fs_poll(struct fuse_fs *fs, struct fuse_file_info *fi, struct fuse_pollhandle *ph, unsigned *reventsp){ fuse_get_context()->private_data = fs->user_data; if (fs->op.poll) { int res;
if (fs->debug) fprintf(stderr, "poll[%llu] ph: %p\n", (unsigned long long) fi->fh, ph);
res = fs->op.poll(fi, ph, reventsp);
if (fs->debug && !res) fprintf(stderr, " poll[%llu] revents: 0x%x\n", (unsigned long long) fi->fh, *reventsp);
return res; } else return -ENOSYS;}
int fuse_fs_fallocate(struct fuse_fs *fs, int mode, off_t offset, off_t length, struct fuse_file_info *fi){ fuse_get_context()->private_data = fs->user_data; if (fs->op.fallocate) { if (fs->debug) fprintf(stderr, "fallocate mode %x, offset: %llu, length: %llu\n", mode, (unsigned long long) offset, (unsigned long long) length);
return fs->op.fallocate(mode, offset, length, fi); } else return -ENOSYS;}
ssize_tfuse_fs_copy_file_range(struct fuse_fs *fs_, struct fuse_file_info *ffi_in_, off_t off_in_, struct fuse_file_info *ffi_out_, off_t off_out_, size_t len_, int flags_){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.copy_file_range == NULL) return -ENOSYS;
return fs_->op.copy_file_range(ffi_in_, off_in_, ffi_out_, off_out_, len_, flags_);}
intnode_open(const struct node *node_){ return ((node_ != NULL) && (node_->open_count > 0));}
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC CLOCK_REALTIME
#endif
static void curr_time(struct timespec *now){ static clockid_t clockid = CLOCK_MONOTONIC; int res = clock_gettime(clockid, now); if (res == -1 && errno == EINVAL) { clockid = CLOCK_REALTIME; res = clock_gettime(clockid, now); } if (res == -1) { perror("fuse: clock_gettime"); abort(); }}
staticvoidupdate_stat(struct node *node_, const struct stat *stnew_){ struct stat *stold;
stold = &node_->stat_cache; if((node_->stat_cache_valid) && ((stold->st_mtim.tv_sec != stnew_->st_mtim.tv_sec) || (stold->st_mtim.tv_nsec != stnew_->st_mtim.tv_nsec) || (stold->st_size != stnew_->st_size))) node_->stat_cache_valid = 0;
*stold = *stnew_;}
staticintlookup_path(struct fuse *f, fuse_ino_t nodeid, const char *name, const char *path, struct fuse_entry_param *e, struct fuse_file_info *fi){ int res;
memset(e,0,sizeof(struct fuse_entry_param));
if(fi) res = fuse_fs_fgetattr(f->fs,&e->attr,fi,&e->timeout); else res = fuse_fs_getattr(f->fs,path,&e->attr,&e->timeout);
if(res == 0) { struct node *node;
node = find_node(f,nodeid,name); if(node == NULL) { res = -ENOMEM; } else { e->ino = node->nodeid; e->generation = node->generation;
pthread_mutex_lock(&f->lock); update_stat(node,&e->attr); pthread_mutex_unlock(&f->lock);
set_stat(f,e->ino,&e->attr); if(f->conf.debug) fprintf(stderr, " NODEID: %llu\n" " GEN: %llu\n", (unsigned long long)e->ino, (unsigned long long)e->generation); } }
return res;}
static struct fuse_context_i *fuse_get_context_internal(void){ struct fuse_context_i *c;
c = (struct fuse_context_i *) pthread_getspecific(fuse_context_key); if (c == NULL) { c = (struct fuse_context_i *) calloc(1, sizeof(struct fuse_context_i)); if (c == NULL) { /* This is hard to deal with properly, so just
abort. If memory is so low that the context cannot be allocated, there's not much hope for the filesystem anyway */ fprintf(stderr, "fuse: failed to allocate thread specific data\n"); abort(); } pthread_setspecific(fuse_context_key, c); } return c;}
static void fuse_freecontext(void *data){ free(data);}
static int fuse_create_context_key(void){ int err = 0; pthread_mutex_lock(&fuse_context_lock); if (!fuse_context_ref) { err = pthread_key_create(&fuse_context_key, fuse_freecontext); if (err) { fprintf(stderr, "fuse: failed to create thread specific key: %s\n", strerror(err)); pthread_mutex_unlock(&fuse_context_lock); return -1; } } fuse_context_ref++; pthread_mutex_unlock(&fuse_context_lock); return 0;}
static void fuse_delete_context_key(void){ pthread_mutex_lock(&fuse_context_lock); fuse_context_ref--; if (!fuse_context_ref) { free(pthread_getspecific(fuse_context_key)); pthread_key_delete(fuse_context_key); } pthread_mutex_unlock(&fuse_context_lock);}
static struct fuse *req_fuse_prepare(fuse_req_t req){ struct fuse_context_i *c = fuse_get_context_internal(); const struct fuse_ctx *ctx = fuse_req_ctx(req); c->req = req; c->ctx.fuse = req_fuse(req); c->ctx.uid = ctx->uid; c->ctx.gid = ctx->gid; c->ctx.pid = ctx->pid; c->ctx.umask = ctx->umask; return c->ctx.fuse;}
static inline void reply_err(fuse_req_t req, int err){ /* fuse_reply_err() uses non-negated errno values */ fuse_reply_err(req, -err);}
static void reply_entry(fuse_req_t req, const struct fuse_entry_param *e, int err){ if (!err) { struct fuse *f = req_fuse(req); if (fuse_reply_entry(req, e) == -ENOENT) { /* Skip forget for negative result */ if (e->ino != 0) forget_node(f, e->ino, 1); } } else reply_err(req, err);}
void fuse_fs_init(struct fuse_fs *fs, struct fuse_conn_info *conn){ fuse_get_context()->private_data = fs->user_data; if (!fs->op.write_buf) conn->want &= ~FUSE_CAP_SPLICE_READ; if (!fs->op.lock) conn->want &= ~FUSE_CAP_POSIX_LOCKS; if (!fs->op.flock) conn->want &= ~FUSE_CAP_FLOCK_LOCKS; if (fs->op.init) fs->user_data = fs->op.init(conn);}
static void fuse_lib_init(void *data, struct fuse_conn_info *conn){ struct fuse *f = (struct fuse *) data; struct fuse_context_i *c = fuse_get_context_internal();
memset(c, 0, sizeof(*c)); c->ctx.fuse = f; conn->want |= FUSE_CAP_EXPORT_SUPPORT; fuse_fs_init(f->fs, conn);}
void fuse_fs_destroy(struct fuse_fs *fs){ fuse_get_context()->private_data = fs->user_data; if (fs->op.destroy) fs->op.destroy(fs->user_data); free(fs);}
static void fuse_lib_destroy(void *data){ struct fuse *f = (struct fuse *) data; struct fuse_context_i *c = fuse_get_context_internal();
memset(c, 0, sizeof(*c)); c->ctx.fuse = f; fuse_fs_destroy(f->fs); f->fs = NULL;}
staticvoidfuse_lib_lookup(fuse_req_t req, fuse_ino_t parent, const char *name){ struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err; struct node *dot = NULL;
if (name[0] == '.') { int len = strlen(name);
if (len == 1 || (name[1] == '.' && len == 2)) { pthread_mutex_lock(&f->lock); if (len == 1) { if (f->conf.debug) fprintf(stderr, "LOOKUP-DOT\n"); dot = get_node_nocheck(f, parent); if (dot == NULL) { pthread_mutex_unlock(&f->lock); reply_entry(req, &e, -ESTALE); return; } dot->refctr++; } else { if (f->conf.debug) fprintf(stderr, "LOOKUP-DOTDOT\n"); parent = get_node(f, parent)->parent->nodeid; } pthread_mutex_unlock(&f->lock); name = NULL; } }
err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "LOOKUP %s\n", path); fuse_prepare_interrupt(f, req, &d); err = lookup_path(f, parent, name, path, &e, NULL); if (err == -ENOENT) { e.ino = 0; err = 0; } fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } if (dot) { pthread_mutex_lock(&f->lock); unref_node(f, dot); pthread_mutex_unlock(&f->lock); } reply_entry(req, &e, err);}
staticvoiddo_forget(struct fuse *f, const fuse_ino_t ino, const uint64_t nlookup){ if(f->conf.debug) fprintf(stderr, "FORGET %llu/%llu\n", (unsigned long long)ino, (unsigned long long)nlookup); forget_node(f, ino, nlookup);}
staticvoidfuse_lib_forget(fuse_req_t req, const fuse_ino_t ino, const uint64_t nlookup){ do_forget(req_fuse(req), ino, nlookup); fuse_reply_none(req);}
static void fuse_lib_forget_multi(fuse_req_t req, size_t count, struct fuse_forget_data *forgets){ struct fuse *f = req_fuse(req); size_t i;
for (i = 0; i < count; i++) do_forget(f, forgets[i].ino, forgets[i].nlookup);
fuse_reply_none(req);}
staticvoidfuse_lib_getattr(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi){
int err; char *path; struct fuse *f; struct stat buf; struct node *node; fuse_timeouts_t timeout; struct fuse_file_info ffi = {0};
f = req_fuse_prepare(req); if(fi == NULL) { pthread_mutex_lock(&f->lock); node = get_node(f,ino); if(node->is_hidden) { fi = &ffi; fi->fh = node->hidden_fh; } pthread_mutex_unlock(&f->lock); }
memset(&buf, 0, sizeof(buf));
err = 0; path = NULL; if((fi == NULL) || (f->fs->op.fgetattr == NULL)) err = get_path(f,ino,&path);
if(!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f,req,&d);
err = ((fi == NULL) ? fuse_fs_getattr(f->fs,path,&buf,&timeout) : fuse_fs_fgetattr(f->fs,&buf,fi,&timeout));
fuse_finish_interrupt(f,req,&d);
free_path(f,ino,path); }
if(!err) { pthread_mutex_lock(&f->lock); node = get_node(f,ino); update_stat(node,&buf); pthread_mutex_unlock(&f->lock); set_stat(f,ino,&buf); fuse_reply_attr(req,&buf,timeout.attr); } else { reply_err(req, err); }}
int fuse_fs_chmod(struct fuse_fs *fs, const char *path, mode_t mode){ fuse_get_context()->private_data = fs->user_data; if (fs->op.chmod) return fs->op.chmod(path, mode); else return -ENOSYS;}
intfuse_fs_fchmod(struct fuse_fs *fs_, const struct fuse_file_info *ffi_, const mode_t mode_){ fuse_get_context()->private_data = fs_->user_data;
if(fs_->op.fchmod) return fs_->op.fchmod(ffi_,mode_);
return -ENOSYS;}
staticvoidfuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, int valid, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); struct stat buf; char *path; int err; struct node *node; fuse_timeouts_t timeout; struct fuse_file_info ffi = {0};
if(fi == NULL) { pthread_mutex_lock(&f->lock); node = get_node(f,ino); if(node->is_hidden) { fi = &ffi; fi->fh = node->hidden_fh; } pthread_mutex_unlock(&f->lock); }
memset(&buf,0,sizeof(buf));
err = 0; path = NULL; if(fi == NULL) err = get_path(f,ino,&path);
if(!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f,req,&d);
err = 0; if (!err && (valid & FATTR_MODE)) err = ((fi == NULL) ? fuse_fs_chmod(f->fs,path,attr->st_mode) : fuse_fs_fchmod(f->fs,fi,attr->st_mode));
if(!err && (valid & (FATTR_UID | FATTR_GID))) { uid_t uid = ((valid & FATTR_UID) ? attr->st_uid : (uid_t) -1); gid_t gid = ((valid & FATTR_GID) ? attr->st_gid : (gid_t) -1);
err = ((fi == NULL) ? fuse_fs_chown(f->fs,path,uid,gid) : fuse_fs_fchown(f->fs,fi,uid,gid)); }
if(!err && (valid & FATTR_SIZE)) err = ((fi == NULL) ? fuse_fs_truncate(f->fs,path,attr->st_size) : fuse_fs_ftruncate(f->fs,attr->st_size,fi));
#ifdef HAVE_UTIMENSAT
if(!err && (valid & (FATTR_ATIME | FATTR_MTIME))) { struct timespec tv[2];
tv[0].tv_sec = 0; tv[1].tv_sec = 0; tv[0].tv_nsec = UTIME_OMIT; tv[1].tv_nsec = UTIME_OMIT;
if(valid & FATTR_ATIME_NOW) tv[0].tv_nsec = UTIME_NOW; else if(valid & FATTR_ATIME) tv[0] = attr->st_atim;
if(valid & FATTR_MTIME_NOW) tv[1].tv_nsec = UTIME_NOW; else if(valid & FATTR_MTIME) tv[1] = attr->st_mtim;
err = ((fi == NULL) ? fuse_fs_utimens(f->fs,path,tv) : fuse_fs_futimens(f->fs,fi,tv)); } else#endif
if(!err && ((valid & (FATTR_ATIME|FATTR_MTIME)) == (FATTR_ATIME|FATTR_MTIME))) { struct timespec tv[2]; tv[0].tv_sec = attr->st_atime; tv[0].tv_nsec = ST_ATIM_NSEC(attr); tv[1].tv_sec = attr->st_mtime; tv[1].tv_nsec = ST_MTIM_NSEC(attr); err = ((fi == NULL) ? fuse_fs_utimens(f->fs,path,tv) : fuse_fs_futimens(f->fs,fi,tv)); }
if (!err) err = ((fi == NULL) ? fuse_fs_getattr(f->fs,path,&buf,&timeout) : fuse_fs_fgetattr(f->fs,&buf,fi,&timeout));
fuse_finish_interrupt(f,req,&d); free_path(f,ino,path); }
if(!err) { pthread_mutex_lock(&f->lock); update_stat(get_node(f,ino),&buf); pthread_mutex_unlock(&f->lock); set_stat(f,ino,&buf); fuse_reply_attr(req,&buf,timeout.attr); } else { reply_err(req,err); }}
static void fuse_lib_access(fuse_req_t req, fuse_ino_t ino, int mask){ struct fuse *f = req_fuse_prepare(req); char *path; int err;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_access(f->fs, path, mask); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err);}
static void fuse_lib_readlink(fuse_req_t req, fuse_ino_t ino){ struct fuse *f = req_fuse_prepare(req); char linkname[PATH_MAX + 1]; char *path; int err;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_readlink(f->fs, path, linkname, sizeof(linkname)); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) { linkname[PATH_MAX] = '\0'; fuse_reply_readlink(req, linkname); } else reply_err(req, err);}
static void fuse_lib_mknod(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev_t rdev){ struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err;
err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = -ENOSYS; if (S_ISREG(mode)) { struct fuse_file_info fi;
memset(&fi, 0, sizeof(fi)); fi.flags = O_CREAT | O_EXCL | O_WRONLY; err = fuse_fs_create(f->fs, path, mode, &fi); if (!err) { err = lookup_path(f, parent, name, path, &e, &fi); fuse_fs_release(f->fs, &fi); } } if (err == -ENOSYS) { err = fuse_fs_mknod(f->fs, path, mode, rdev); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); } fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err);}
static void fuse_lib_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode){ struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err;
err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_mkdir(f->fs, path, mode); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err);}
staticvoidfuse_lib_unlink(fuse_req_t req, fuse_ino_t parent, const char *name){ int err; char *path; struct fuse *f; struct node *wnode; struct fuse_intr_data d;
f = req_fuse_prepare(req); err = get_path_wrlock(f,parent,name,&path,&wnode);
if(!err) { fuse_prepare_interrupt(f,req,&d);
pthread_mutex_lock(&f->lock); if(node_open(wnode)) { err = fuse_fs_prepare_hide(f->fs,path,&wnode->hidden_fh); if(!err) wnode->is_hidden = 1; } pthread_mutex_unlock(&f->lock);
err = fuse_fs_unlink(f->fs,path); if(!err) remove_node(f,parent,name);
fuse_finish_interrupt(f,req,&d); free_path_wrlock(f,parent,wnode,path); }
reply_err(req,err);}
static void fuse_lib_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name){ struct fuse *f = req_fuse_prepare(req); struct node *wnode; char *path; int err;
err = get_path_wrlock(f, parent, name, &path, &wnode); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_rmdir(f->fs, path); fuse_finish_interrupt(f, req, &d); if (!err) remove_node(f, parent, name); free_path_wrlock(f, parent, wnode, path); } reply_err(req, err);}
static void fuse_lib_symlink(fuse_req_t req, const char *linkname, fuse_ino_t parent, const char *name){ struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err;
err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_symlink(f->fs, linkname, path); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err);}
staticvoidfuse_lib_rename(fuse_req_t req, fuse_ino_t olddir, const char *oldname, fuse_ino_t newdir, const char *newname){ int err; struct fuse *f; char *oldpath; char *newpath; struct node *wnode1; struct node *wnode2; struct fuse_intr_data d;
f = req_fuse_prepare(req); err = get_path2(f,olddir,oldname,newdir,newname, &oldpath,&newpath,&wnode1,&wnode2);
if(!err) { fuse_prepare_interrupt(f,req,&d);
pthread_mutex_lock(&f->lock); if(node_open(wnode2)) { err = fuse_fs_prepare_hide(f->fs,newpath,&wnode2->hidden_fh); if(!err) wnode2->is_hidden = 1; } pthread_mutex_unlock(&f->lock);
err = fuse_fs_rename(f->fs,oldpath,newpath); if(!err) err = rename_node(f,olddir,oldname,newdir,newname);
fuse_finish_interrupt(f,req,&d); free_path2(f,olddir,newdir,wnode1,wnode2,oldpath,newpath); }
reply_err(req,err);}
static void fuse_lib_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent, const char *newname){ struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *oldpath; char *newpath; int err;
err = get_path2(f, ino, NULL, newparent, newname, &oldpath, &newpath, NULL, NULL); if (!err) { struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_link(f->fs, oldpath, newpath); if (!err) err = lookup_path(f, newparent, newname, newpath, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path2(f, ino, newparent, NULL, NULL, oldpath, newpath); } reply_entry(req, &e, err);}
static void fuse_do_release(struct fuse *f, fuse_ino_t ino, struct fuse_file_info *fi){ struct node *node; uint64_t fh; int was_hidden;
fh = 0; fuse_fs_release(f->fs, fi);
pthread_mutex_lock(&f->lock); node = get_node(f, ino); assert(node->open_count > 0); node->open_count--; was_hidden = 0; if (node->is_hidden && (node->open_count == 0)) { was_hidden = 1; node->is_hidden = 0; fh = node->hidden_fh; } pthread_mutex_unlock(&f->lock);
if(was_hidden) fuse_fs_free_hide(f->fs,fh);}
staticvoidfuse_lib_create(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, struct fuse_file_info *fi){ int err; char *path; struct fuse *f; struct fuse_intr_data d; struct fuse_entry_param e;
f = req_fuse_prepare(req); err = get_path_name(f, parent, name, &path); if(!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_create(f->fs, path, mode, fi); if(!err) { err = lookup_path(f, parent, name, path, &e, fi); if(err) { fuse_fs_release(f->fs, fi); } else if(!S_ISREG(e.attr.st_mode)) { err = -EIO; fuse_fs_release(f->fs, fi); forget_node(f, e.ino, 1); } } fuse_finish_interrupt(f, req, &d); }
if(!err) { pthread_mutex_lock(&f->lock); get_node(f,e.ino)->open_count++; pthread_mutex_unlock(&f->lock);
if (fuse_reply_create(req, &e, fi) == -ENOENT) { /* The open syscall was interrupted, so it
must be cancelled */ fuse_do_release(f, e.ino, fi); forget_node(f, e.ino, 1); } } else { reply_err(req, err); }
free_path(f, parent, path);}
static double diff_timespec(const struct timespec *t1, const struct timespec *t2){ return (t1->tv_sec - t2->tv_sec) + ((double) t1->tv_nsec - (double) t2->tv_nsec) / 1000000000.0;}
staticvoidopen_auto_cache(struct fuse *f, fuse_ino_t ino, const char *path, struct fuse_file_info *fi){ struct node *node; fuse_timeouts_t timeout;
pthread_mutex_lock(&f->lock);
node = get_node(f,ino); if(node->stat_cache_valid) { int err; struct stat stbuf;
pthread_mutex_unlock(&f->lock); err = fuse_fs_fgetattr(f->fs,&stbuf,fi,&timeout); pthread_mutex_lock(&f->lock);
if(!err) update_stat(node,&stbuf); else node->stat_cache_valid = 0; }
if(node->stat_cache_valid) fi->keep_cache = 1;
node->stat_cache_valid = 1;
pthread_mutex_unlock(&f->lock);}
staticvoidfuse_lib_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi){ int err; char *path; struct fuse *f; struct fuse_intr_data d;
f = req_fuse_prepare(req); err = get_path(f, ino, &path); if(!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_open(f->fs, path, fi); if(!err) { if (fi && fi->auto_cache) open_auto_cache(f, ino, path, fi); } fuse_finish_interrupt(f, req, &d); }
if(!err) { pthread_mutex_lock(&f->lock); get_node(f,ino)->open_count++; pthread_mutex_unlock(&f->lock); /* The open syscall was interrupted, so it must be cancelled */ if(fuse_reply_open(req, fi) == -ENOENT) fuse_do_release(f, ino, fi); } else { reply_err(req, err); }
free_path(f, ino, path);}
static void fuse_lib_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); struct fuse_bufvec *buf = NULL; int res; struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); res = fuse_fs_read_buf(f->fs, &buf, size, off, fi); fuse_finish_interrupt(f, req, &d);
if (res == 0) fuse_reply_data(req, buf, FUSE_BUF_SPLICE_MOVE); else reply_err(req, res);
fuse_free_buf(buf);}
static void fuse_lib_write_buf(fuse_req_t req, fuse_ino_t ino, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); int res; struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); res = fuse_fs_write_buf(f->fs, buf, off, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, NULL);
if (res >= 0) fuse_reply_write(req, res); else reply_err(req, res);}
static void fuse_lib_fsync(fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); int err; struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fsync(f->fs, datasync, fi); fuse_finish_interrupt(f, req, &d);
reply_err(req, err);}
static struct fuse_dh *get_dirhandle(const struct fuse_file_info *llfi, struct fuse_file_info *fi){ struct fuse_dh *dh = (struct fuse_dh *) (uintptr_t) llfi->fh; memset(fi, 0, sizeof(struct fuse_file_info)); fi->fh = dh->fh; return dh;}
static void fuse_lib_opendir(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *llfi){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_dh *dh; struct fuse_file_info fi; char *path; int err;
dh = (struct fuse_dh *) calloc(1,sizeof(struct fuse_dh)); if (dh == NULL) { reply_err(req, -ENOMEM); return; }
fuse_dirents_init(&dh->d); fuse_mutex_init(&dh->lock);
llfi->fh = (uintptr_t) dh;
memset(&fi, 0, sizeof(fi)); fi.flags = llfi->flags;
err = get_path(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_opendir(f->fs, path, &fi); fuse_finish_interrupt(f, req, &d); dh->fh = fi.fh; llfi->keep_cache = fi.keep_cache; llfi->cache_readdir = fi.cache_readdir; }
if (!err) { if (fuse_reply_open(req, llfi) == -ENOENT) { /* The opendir syscall was interrupted, so it
must be cancelled */ fuse_fs_releasedir(f->fs, &fi); pthread_mutex_destroy(&dh->lock); free(dh); } } else { reply_err(req, err); pthread_mutex_destroy(&dh->lock); free(dh); } free_path(f, ino, path);}
staticintreaddir_fill(struct fuse *f_, fuse_req_t req_, fuse_dirents_t *d_, struct fuse_file_info *fi_){ int rv; struct fuse_intr_data intr_data;
fuse_prepare_interrupt(f_,req_,&intr_data); rv = fuse_fs_readdir(f_->fs,fi_,d_); fuse_finish_interrupt(f_,req_,&intr_data);
return rv;}
staticintreaddir_plus_fill(struct fuse *f_, fuse_req_t req_, fuse_dirents_t *d_, struct fuse_file_info *fi_){ int rv; struct fuse_intr_data intr_data;
fuse_prepare_interrupt(f_,req_,&intr_data); rv = fuse_fs_readdir_plus(f_->fs,fi_,d_); fuse_finish_interrupt(f_,req_,&intr_data);
return rv;}
staticsize_treaddir_buf_size(fuse_dirents_t *d_, size_t size_, off_t off_){ if(off_ >= kv_size(d_->offs)) return 0; if((kv_A(d_->offs,off_) + size_) > d_->data_len) return (d_->data_len - kv_A(d_->offs,off_)); return size_;}
staticchar*readdir_buf(fuse_dirents_t *d_, off_t off_){ return &d_->buf[kv_A(d_->offs,off_)];}
staticvoidfuse_lib_readdir(fuse_req_t req_, fuse_ino_t ino_, size_t size_, off_t off_, struct fuse_file_info *llffi_){ int rv; struct fuse *f; fuse_dirents_t *d; struct fuse_dh *dh; struct fuse_file_info fi;
f = req_fuse_prepare(req_); dh = get_dirhandle(llffi_,&fi); d = &dh->d;
pthread_mutex_lock(&dh->lock);
rv = 0; if((off_ == 0) || (d->data_len == 0)) rv = readdir_fill(f,req_,d,&fi);
if(rv) { reply_err(req_,rv); goto out; }
size_ = readdir_buf_size(d,size_,off_);
fuse_reply_buf(req_, readdir_buf(d,off_), size_);
out: pthread_mutex_unlock(&dh->lock);}
staticvoidfuse_lib_readdir_plus(fuse_req_t req_, fuse_ino_t ino_, size_t size_, off_t off_, struct fuse_file_info *llffi_){ int rv; struct fuse *f; fuse_dirents_t *d; struct fuse_dh *dh; struct fuse_file_info fi;
f = req_fuse_prepare(req_); dh = get_dirhandle(llffi_,&fi); d = &dh->d;
pthread_mutex_lock(&dh->lock);
rv = 0; if((off_ == 0) || (d->data_len == 0)) rv = readdir_plus_fill(f,req_,d,&fi);
if(rv) { reply_err(req_,rv); goto out; }
size_ = readdir_buf_size(d,size_,off_);
fuse_reply_buf(req_, readdir_buf(d,off_), size_);
out: pthread_mutex_unlock(&dh->lock);}
staticvoidfuse_lib_releasedir(fuse_req_t req_, fuse_ino_t ino_, struct fuse_file_info *llfi_){ struct fuse *f; struct fuse_dh *dh; struct fuse_intr_data d; struct fuse_file_info fi;
f = req_fuse_prepare(req_); dh = get_dirhandle(llfi_,&fi);
fuse_prepare_interrupt(f,req_,&d); fuse_fs_releasedir(f->fs,&fi); fuse_finish_interrupt(f,req_,&d);
/* Done to keep race condition between last readdir reply and the unlock */ pthread_mutex_lock(&dh->lock); pthread_mutex_unlock(&dh->lock); pthread_mutex_destroy(&dh->lock); fuse_dirents_free(&dh->d); free(dh); reply_err(req_,0);}
static void fuse_lib_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *llfi){ struct fuse *f = req_fuse_prepare(req); struct fuse_file_info fi; int err; struct fuse_intr_data d;
get_dirhandle(llfi, &fi);
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fsyncdir(f->fs, datasync, &fi); fuse_finish_interrupt(f, req, &d);
reply_err(req, err);}
static void fuse_lib_statfs(fuse_req_t req, fuse_ino_t ino){ struct fuse *f = req_fuse_prepare(req); struct statvfs buf; char *path = NULL; int err = 0;
memset(&buf, 0, sizeof(buf)); if (ino) err = get_path(f, ino, &path);
if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_statfs(f->fs, path ? path : "/", &buf); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); }
if (!err) fuse_reply_statfs(req, &buf); else reply_err(req, err);}
static void fuse_lib_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name, const char *value, size_t size, int flags){ struct fuse *f = req_fuse_prepare(req); char *path; int err;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_setxattr(f->fs, path, name, value, size, flags); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err);}
static int common_getxattr(struct fuse *f, fuse_req_t req, fuse_ino_t ino, const char *name, char *value, size_t size){ int err; char *path;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_getxattr(f->fs, path, name, value, size); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } return err;}
static void fuse_lib_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name, size_t size){ struct fuse *f = req_fuse_prepare(req); int res;
if (size) { char *value = (char *) malloc(size); if (value == NULL) { reply_err(req, -ENOMEM); return; } res = common_getxattr(f, req, ino, name, value, size); if (res > 0) fuse_reply_buf(req, value, res); else reply_err(req, res); free(value); } else { res = common_getxattr(f, req, ino, name, NULL, 0); if (res >= 0) fuse_reply_xattr(req, res); else reply_err(req, res); }}
static int common_listxattr(struct fuse *f, fuse_req_t req, fuse_ino_t ino, char *list, size_t size){ char *path; int err;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_listxattr(f->fs, path, list, size); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } return err;}
static void fuse_lib_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size){ struct fuse *f = req_fuse_prepare(req); int res;
if (size) { char *list = (char *) malloc(size); if (list == NULL) { reply_err(req, -ENOMEM); return; } res = common_listxattr(f, req, ino, list, size); if (res > 0) fuse_reply_buf(req, list, res); else reply_err(req, res); free(list); } else { res = common_listxattr(f, req, ino, NULL, 0); if (res >= 0) fuse_reply_xattr(req, res); else reply_err(req, res); }}
static void fuse_lib_removexattr(fuse_req_t req, fuse_ino_t ino, const char *name){ struct fuse *f = req_fuse_prepare(req); char *path; int err;
err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_removexattr(f->fs, path, name); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err);}
staticvoidfuse_lib_copy_file_range(fuse_req_t req_, fuse_ino_t nodeid_in_, off_t off_in_, struct fuse_file_info *ffi_in_, fuse_ino_t nodeid_out_, off_t off_out_, struct fuse_file_info *ffi_out_, size_t len_, int flags_){ ssize_t rv; struct fuse *f; struct fuse_intr_data d;
f = req_fuse_prepare(req_);
fuse_prepare_interrupt(f,req_,&d);
rv = fuse_fs_copy_file_range(f->fs, ffi_in_, off_in_, ffi_out_, off_out_, len_, flags_);
fuse_finish_interrupt(f,req_,&d);
if(rv >= 0) fuse_reply_write(req_,rv); else reply_err(req_,rv);}
static struct lock *locks_conflict(struct node *node, const struct lock *lock){ struct lock *l;
for (l = node->locks; l; l = l->next) if (l->owner != lock->owner && lock->start <= l->end && l->start <= lock->end && (l->type == F_WRLCK || lock->type == F_WRLCK)) break;
return l;}
static void delete_lock(struct lock **lockp){ struct lock *l = *lockp; *lockp = l->next; free(l);}
static void insert_lock(struct lock **pos, struct lock *lock){ lock->next = *pos; *pos = lock;}
static int locks_insert(struct node *node, struct lock *lock){ struct lock **lp; struct lock *newl1 = NULL; struct lock *newl2 = NULL;
if (lock->type != F_UNLCK || lock->start != 0 || lock->end != OFFSET_MAX) { newl1 = malloc(sizeof(struct lock)); newl2 = malloc(sizeof(struct lock));
if (!newl1 || !newl2) { free(newl1); free(newl2); return -ENOLCK; } }
for (lp = &node->locks; *lp;) { struct lock *l = *lp; if (l->owner != lock->owner) goto skip;
if (lock->type == l->type) { if (l->end < lock->start - 1) goto skip; if (lock->end < l->start - 1) break; if (l->start <= lock->start && lock->end <= l->end) goto out; if (l->start < lock->start) lock->start = l->start; if (lock->end < l->end) lock->end = l->end; goto delete; } else { if (l->end < lock->start) goto skip; if (lock->end < l->start) break; if (lock->start <= l->start && l->end <= lock->end) goto delete; if (l->end <= lock->end) { l->end = lock->start - 1; goto skip; } if (lock->start <= l->start) { l->start = lock->end + 1; break; } *newl2 = *l; newl2->start = lock->end + 1; l->end = lock->start - 1; insert_lock(&l->next, newl2); newl2 = NULL; } skip: lp = &l->next; continue;
delete: delete_lock(lp); } if (lock->type != F_UNLCK) { *newl1 = *lock; insert_lock(lp, newl1); newl1 = NULL; } out: free(newl1); free(newl2); return 0;}
static void flock_to_lock(struct flock *flock, struct lock *lock){ memset(lock, 0, sizeof(struct lock)); lock->type = flock->l_type; lock->start = flock->l_start; lock->end = flock->l_len ? flock->l_start + flock->l_len - 1 : OFFSET_MAX; lock->pid = flock->l_pid;}
static void lock_to_flock(struct lock *lock, struct flock *flock){ flock->l_type = lock->type; flock->l_start = lock->start; flock->l_len = (lock->end == OFFSET_MAX) ? 0 : lock->end - lock->start + 1; flock->l_pid = lock->pid;}
static int fuse_flush_common(struct fuse *f, fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi){ struct fuse_intr_data d; struct flock lock; struct lock l; int err; int errlock;
fuse_prepare_interrupt(f, req, &d); memset(&lock, 0, sizeof(lock)); lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; err = fuse_fs_flush(f->fs, fi); errlock = fuse_fs_lock(f->fs, fi, F_SETLK, &lock); fuse_finish_interrupt(f, req, &d);
if (errlock != -ENOSYS) { flock_to_lock(&lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); locks_insert(get_node(f, ino), &l); pthread_mutex_unlock(&f->lock);
/* if op.lock() is defined FLUSH is needed regardless
of op.flush() */ if (err == -ENOSYS) err = 0; } return err;}
static void fuse_lib_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; int err = 0;
if (fi->flush) { err = fuse_flush_common(f, req, ino, fi); if (err == -ENOSYS) err = 0; }
fuse_prepare_interrupt(f, req, &d); fuse_do_release(f, ino, fi); fuse_finish_interrupt(f, req, &d);
reply_err(req, err);}
static void fuse_lib_flush(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); int err;
err = fuse_flush_common(f, req, ino, fi);
reply_err(req, err);}
static int fuse_lock_common(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock, int cmd){ struct fuse *f = req_fuse_prepare(req); int err; struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_lock(f->fs, fi, cmd, lock); fuse_finish_interrupt(f, req, &d);
return err;}
static void fuse_lib_getlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock){ int err; struct lock l; struct lock *conflict; struct fuse *f = req_fuse(req);
flock_to_lock(lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); conflict = locks_conflict(get_node(f, ino), &l); if (conflict) lock_to_flock(conflict, lock); pthread_mutex_unlock(&f->lock); if (!conflict) err = fuse_lock_common(req, ino, fi, lock, F_GETLK); else err = 0;
if (!err) fuse_reply_lock(req, lock); else reply_err(req, err);}
static void fuse_lib_setlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock, int sleep){ int err = fuse_lock_common(req, ino, fi, lock, sleep ? F_SETLKW : F_SETLK); if (!err) { struct fuse *f = req_fuse(req); struct lock l; flock_to_lock(lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); locks_insert(get_node(f, ino), &l); pthread_mutex_unlock(&f->lock); } reply_err(req, err);}
static void fuse_lib_flock(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, int op){ struct fuse *f = req_fuse_prepare(req); int err; struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_flock(f->fs, fi, op); fuse_finish_interrupt(f, req, &d);
reply_err(req, err);}
static void fuse_lib_bmap(fuse_req_t req, fuse_ino_t ino, size_t blocksize, uint64_t idx){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err;
err = get_path(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_bmap(f->fs, path, blocksize, &idx); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) fuse_reply_bmap(req, idx); else reply_err(req, err);}
static void fuse_lib_ioctl(fuse_req_t req, fuse_ino_t ino, unsigned long cmd, void *arg, struct fuse_file_info *llfi, unsigned int flags, const void *in_buf, uint32_t in_bufsz, uint32_t out_bufsz_){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_file_info fi; char *out_buf = NULL; int err; uint32_t out_bufsz = out_bufsz_;
err = -EPERM; if (flags & FUSE_IOCTL_UNRESTRICTED) goto err;
if (flags & FUSE_IOCTL_DIR) get_dirhandle(llfi, &fi); else fi = *llfi;
if (out_bufsz) { err = -ENOMEM; out_buf = malloc(out_bufsz); if (!out_buf) goto err; }
assert(!in_bufsz || !out_bufsz || in_bufsz == out_bufsz); if (out_buf) memcpy(out_buf, in_buf, in_bufsz);
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_ioctl(f->fs, cmd, arg, &fi, flags, out_buf ?: (void *)in_buf, &out_bufsz);
fuse_finish_interrupt(f, req, &d);
fuse_reply_ioctl(req, err, out_buf, out_bufsz); goto out; err: reply_err(req, err); out: free(out_buf);}
static void fuse_lib_poll(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct fuse_pollhandle *ph){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; int err; unsigned revents = 0;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_poll(f->fs, fi, ph, &revents); fuse_finish_interrupt(f, req, &d);
if (!err) fuse_reply_poll(req, revents); else reply_err(req, err);}
static void fuse_lib_fallocate(fuse_req_t req, fuse_ino_t ino, int mode, off_t offset, off_t length, struct fuse_file_info *fi){ struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; int err;
fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fallocate(f->fs, mode, offset, length, fi); fuse_finish_interrupt(f, req, &d);
reply_err(req, err);}
static int clean_delay(struct fuse *f){ /*
* This is calculating the delay between clean runs. To * reduce the number of cleans we are doing them 10 times * within the remember window. */ int min_sleep = 60; int max_sleep = 3600; int sleep_time = f->conf.remember / 10;
if (sleep_time > max_sleep) return max_sleep; if (sleep_time < min_sleep) return min_sleep; return sleep_time;}
int fuse_clean_cache(struct fuse *f){ struct node_lru *lnode; struct list_head *curr, *next; struct node *node; struct timespec now;
pthread_mutex_lock(&f->lock);
curr_time(&now);
for (curr = f->lru_table.next; curr != &f->lru_table; curr = next) { double age;
next = curr->next; lnode = list_entry(curr, struct node_lru, lru); node = &lnode->node;
age = diff_timespec(&now, &lnode->forget_time); if (age <= f->conf.remember) break;
assert(node->nlookup == 1);
/* Don't forget active directories */ if (node->refctr > 1) continue;
node->nlookup = 0; unhash_name(f, node); unref_node(f, node); } pthread_mutex_unlock(&f->lock);
return clean_delay(f);}
static struct fuse_lowlevel_ops fuse_path_ops = { .init = fuse_lib_init, .destroy = fuse_lib_destroy, .lookup = fuse_lib_lookup, .forget = fuse_lib_forget, .forget_multi = fuse_lib_forget_multi, .getattr = fuse_lib_getattr, .setattr = fuse_lib_setattr, .access = fuse_lib_access, .readlink = fuse_lib_readlink, .mknod = fuse_lib_mknod, .mkdir = fuse_lib_mkdir, .unlink = fuse_lib_unlink, .rmdir = fuse_lib_rmdir, .symlink = fuse_lib_symlink, .rename = fuse_lib_rename, .link = fuse_lib_link, .create = fuse_lib_create, .open = fuse_lib_open, .read = fuse_lib_read, .write_buf = fuse_lib_write_buf, .flush = fuse_lib_flush, .release = fuse_lib_release, .fsync = fuse_lib_fsync, .opendir = fuse_lib_opendir, .readdir = fuse_lib_readdir, .readdir_plus = fuse_lib_readdir_plus, .releasedir = fuse_lib_releasedir, .fsyncdir = fuse_lib_fsyncdir, .statfs = fuse_lib_statfs, .setxattr = fuse_lib_setxattr, .getxattr = fuse_lib_getxattr, .listxattr = fuse_lib_listxattr, .removexattr = fuse_lib_removexattr, .getlk = fuse_lib_getlk, .setlk = fuse_lib_setlk, .flock = fuse_lib_flock, .bmap = fuse_lib_bmap, .ioctl = fuse_lib_ioctl, .poll = fuse_lib_poll, .fallocate = fuse_lib_fallocate, .copy_file_range = fuse_lib_copy_file_range,};
int fuse_notify_poll(struct fuse_pollhandle *ph){ return fuse_lowlevel_notify_poll(ph);}
static void free_cmd(struct fuse_cmd *cmd){ free(cmd->buf); free(cmd);}
void fuse_process_cmd(struct fuse *f, struct fuse_cmd *cmd){ fuse_session_process(f->se, cmd->buf, cmd->buflen, cmd->ch); free_cmd(cmd);}
int fuse_exited(struct fuse *f){ return fuse_session_exited(f->se);}
struct fuse_session *fuse_get_session(struct fuse *f){ return f->se;}
static struct fuse_cmd *fuse_alloc_cmd(size_t bufsize){ struct fuse_cmd *cmd = (struct fuse_cmd *) malloc(sizeof(*cmd)); if (cmd == NULL) { fprintf(stderr, "fuse: failed to allocate cmd\n"); return NULL; } cmd->buf = (char *) malloc(bufsize); if (cmd->buf == NULL) { fprintf(stderr, "fuse: failed to allocate read buffer\n"); free(cmd); return NULL; } return cmd;}
struct fuse_cmd *fuse_read_cmd(struct fuse *f){ struct fuse_chan *ch = fuse_session_next_chan(f->se, NULL); size_t bufsize = fuse_chan_bufsize(ch); struct fuse_cmd *cmd = fuse_alloc_cmd(bufsize); if (cmd != NULL) { int res = fuse_chan_recv(&ch, cmd->buf, bufsize); if (res <= 0) { free_cmd(cmd); if (res < 0 && res != -EINTR && res != -EAGAIN) fuse_exit(f); return NULL; } cmd->buflen = res; cmd->ch = ch; } return cmd;}
int fuse_invalidate(struct fuse *f, const char *path){ (void) f; (void) path; return -EINVAL;}
void fuse_exit(struct fuse *f){ fuse_session_exit(f->se);}
struct fuse_context *fuse_get_context(void){ return &fuse_get_context_internal()->ctx;}
int fuse_interrupted(void){ return fuse_req_interrupted(fuse_get_context_internal()->req);}
void fuse_set_getcontext_func(struct fuse_context *(*func)(void)){ (void) func; /* no-op */}
enum { KEY_HELP,};
#define FUSE_LIB_OPT(t, p, v) { t, offsetof(struct fuse_config, p), v }
static const struct fuse_opt fuse_lib_opts[] = { FUSE_OPT_KEY("-h", KEY_HELP), FUSE_OPT_KEY("--help", KEY_HELP), FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP), FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP), FUSE_LIB_OPT("debug", debug, 1), FUSE_LIB_OPT("-d", debug, 1), FUSE_LIB_OPT("umask=", set_mode, 1), FUSE_LIB_OPT("umask=%o", umask, 0), FUSE_LIB_OPT("uid=", set_uid, 1), FUSE_LIB_OPT("uid=%d", uid, 0), FUSE_LIB_OPT("gid=", set_gid, 1), FUSE_LIB_OPT("gid=%d", gid, 0), FUSE_LIB_OPT("noforget", remember, -1), FUSE_LIB_OPT("remember=%u", remember, 0), FUSE_LIB_OPT("intr", intr, 1), FUSE_LIB_OPT("intr_signal=%d", intr_signal, 0), FUSE_LIB_OPT("threads=%d", threads, 0), FUSE_LIB_OPT("use_ino", use_ino, 1), FUSE_OPT_END};
static void fuse_lib_help(void){ fprintf(stderr, " -o umask=M set file permissions (octal)\n" " -o uid=N set file owner\n" " -o gid=N set file group\n" " -o noforget never forget cached inodes\n" " -o remember=T remember cached inodes for T seconds (0s)\n" " -o intr allow requests to be interrupted\n" " -o intr_signal=NUM signal to send on interrupt (%i)\n" " -o threads=NUM number of worker threads. 0 = autodetect.\n" " Negative values autodetect then divide by\n" " absolute value. default = 0\n" "\n", FUSE_DEFAULT_INTR_SIGNAL);}
static int fuse_lib_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs){ (void) arg; (void) outargs;
if (key == KEY_HELP) { struct fuse_config *conf = (struct fuse_config *) data; fuse_lib_help(); conf->help = 1; }
return 1;}
int fuse_is_lib_option(const char *opt){ return fuse_lowlevel_is_lib_option(opt) || fuse_opt_match(fuse_lib_opts, opt);}
static int fuse_init_intr_signal(int signum, int *installed){ struct sigaction old_sa;
if (sigaction(signum, NULL, &old_sa) == -1) { perror("fuse: cannot get old signal handler"); return -1; }
if (old_sa.sa_handler == SIG_DFL) { struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction)); sa.sa_handler = fuse_intr_sighandler; sigemptyset(&sa.sa_mask);
if (sigaction(signum, &sa, NULL) == -1) { perror("fuse: cannot set interrupt signal handler"); return -1; } *installed = 1; } return 0;}
static void fuse_restore_intr_signal(int signum){ struct sigaction sa;
memset(&sa, 0, sizeof(struct sigaction)); sa.sa_handler = SIG_DFL; sigaction(signum, &sa, NULL);}
struct fuse_fs *fuse_fs_new(const struct fuse_operations *op, size_t op_size, void *user_data){ struct fuse_fs *fs;
if (sizeof(struct fuse_operations) < op_size) { fprintf(stderr, "fuse: warning: library too old, some operations may not not work\n"); op_size = sizeof(struct fuse_operations); }
fs = (struct fuse_fs *) calloc(1, sizeof(struct fuse_fs)); if (!fs) { fprintf(stderr, "fuse: failed to allocate fuse_fs object\n"); return NULL; }
fs->user_data = user_data; if (op) memcpy(&fs->op, op, op_size); return fs;}
static int node_table_init(struct node_table *t){ t->size = NODE_TABLE_MIN_SIZE; t->array = (struct node **) calloc(1, sizeof(struct node *) * t->size); if (t->array == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); return -1; } t->use = 0; t->split = 0;
return 0;}
static void *fuse_prune_nodes(void *fuse){ struct fuse *f = fuse; int sleep_time;
while(1) { sleep_time = fuse_clean_cache(f); sleep(sleep_time); } return NULL;}
int fuse_start_cleanup_thread(struct fuse *f){ if (lru_enabled(f)) return fuse_start_thread(&f->prune_thread, fuse_prune_nodes, f);
return 0;}
void fuse_stop_cleanup_thread(struct fuse *f){ if (lru_enabled(f)) { pthread_mutex_lock(&f->lock); pthread_cancel(f->prune_thread); pthread_mutex_unlock(&f->lock); pthread_join(f->prune_thread, NULL); }}
struct fuse *fuse_new_common(struct fuse_chan *ch, struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data){ struct fuse *f; struct node *root; struct fuse_fs *fs; struct fuse_lowlevel_ops llop = fuse_path_ops;
if (fuse_create_context_key() == -1) goto out;
f = (struct fuse *) calloc(1, sizeof(struct fuse)); if (f == NULL) { fprintf(stderr, "fuse: failed to allocate fuse object\n"); goto out_delete_context_key; }
fs = fuse_fs_new(op, op_size, user_data); if (!fs) goto out_free;
f->fs = fs;
/* Oh f**k, this is ugly! */ if (!fs->op.lock) { llop.getlk = NULL; llop.setlk = NULL; }
f->conf.intr_signal = FUSE_DEFAULT_INTR_SIGNAL;
f->pagesize = getpagesize(); init_list_head(&f->partial_slabs); init_list_head(&f->full_slabs); init_list_head(&f->lru_table);
if (fuse_opt_parse(args, &f->conf, fuse_lib_opts, fuse_lib_opt_proc) == -1) goto out_free_fs;
f->se = fuse_lowlevel_new_common(args, &llop, sizeof(llop), f); if (f->se == NULL) { goto out_free_fs; }
fuse_session_add_chan(f->se, ch);
/* Trace topmost layer by default */ srand(time(NULL)); f->fs->debug = f->conf.debug; f->ctr = 0; f->generation = rand64(); if (node_table_init(&f->name_table) == -1) goto out_free_session;
if (node_table_init(&f->id_table) == -1) goto out_free_name_table;
fuse_mutex_init(&f->lock);
root = alloc_node(f); if (root == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); goto out_free_id_table; } if (lru_enabled(f)) { struct node_lru *lnode = node_lru(root); init_list_head(&lnode->lru); }
strcpy(root->inline_name, "/"); root->name = root->inline_name;
if (f->conf.intr && fuse_init_intr_signal(f->conf.intr_signal, &f->intr_installed) == -1) goto out_free_root;
root->parent = NULL; root->nodeid = FUSE_ROOT_ID; inc_nlookup(root); hash_id(f, root);
return f;
out_free_root: free(root); out_free_id_table: free(f->id_table.array); out_free_name_table: free(f->name_table.array); out_free_session: fuse_session_destroy(f->se); out_free_fs: /* Horrible compatibility hack to stop the destructor from being
called on the filesystem without init being called first */ fs->op.destroy = NULL; fuse_fs_destroy(f->fs); out_free: free(f); out_delete_context_key: fuse_delete_context_key(); out: return NULL;}
struct fuse *fuse_new(struct fuse_chan *ch, struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data){ return fuse_new_common(ch, args, op, op_size, user_data);}
void fuse_destroy(struct fuse *f){ size_t i;
if (f->conf.intr && f->intr_installed) fuse_restore_intr_signal(f->conf.intr_signal);
if (f->fs) { struct fuse_context_i *c = fuse_get_context_internal();
memset(c, 0, sizeof(*c)); c->ctx.fuse = f;
for (i = 0; i < f->id_table.size; i++) { struct node *node;
for (node = f->id_table.array[i]; node != NULL; node = node->id_next) { if (node->is_hidden) fuse_fs_free_hide(f->fs,node->hidden_fh); } } } for (i = 0; i < f->id_table.size; i++) { struct node *node; struct node *next;
for (node = f->id_table.array[i]; node != NULL; node = next) { next = node->id_next; free_node(f, node); f->id_table.use--; } } assert(list_empty(&f->partial_slabs)); assert(list_empty(&f->full_slabs));
free(f->id_table.array); free(f->name_table.array); pthread_mutex_destroy(&f->lock); fuse_session_destroy(f->se); free(f); fuse_delete_context_key();}
intfuse_config_num_threads(const struct fuse *fuse_){ return fuse_->conf.threads;}
|
