fuse.c
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
Implementation of the high-level FUSE API on top of the low-level
API.
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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdbool.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <limits.h>
#include <errno.h>
#include <signal.h>
#include <dlfcn.h>
#include <assert.h>
#include <poll.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/file.h>
#define FUSE_NODE_SLAB 1
#ifndef MAP_ANONYMOUS
#undef FUSE_NODE_SLAB
#endif
#ifndef RENAME_EXCHANGE
#define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */
#endif
#define FUSE_DEFAULT_INTR_SIGNAL SIGUSR1
#define FUSE_UNKNOWN_INO 0xffffffff
#define OFFSET_MAX 0x7fffffffffffffffLL
#define NODE_TABLE_MIN_SIZE 8192
struct fuse_fs {
struct fuse_operations op;
struct fuse_module *m;
void *user_data;
int debug;
};
struct fusemod_so {
void *handle;
int ctr;
};
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;
unsigned int 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;
unsigned int generation;
int refctr;
struct node *parent;
char *name;
uint64_t nlookup;
int open_count;
struct timespec stat_updated;
struct timespec mtime;
off_t size;
struct lock *locks;
unsigned int is_hidden : 1;
unsigned int cache_valid : 1;
int treelock;
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_direntry {
struct stat stat;
char *name;
struct fuse_direntry *next;
};
struct fuse_dh {
pthread_mutex_t lock;
struct fuse *fuse;
fuse_req_t req;
char *contents;
struct fuse_direntry *first;
struct fuse_direntry **last;
unsigned len;
unsigned size;
unsigned needlen;
int filled;
uint64_t fh;
int error;
fuse_ino_t nodeid;
};
struct fuse_context_i {
struct fuse_context ctx;
fuse_req_t req;
};
/* Defined by FUSE_REGISTER_MODULE() in lib/modules/subdir.c and iconv.c. */
extern fuse_module_factory_t fuse_module_subdir_factory;
#ifdef HAVE_ICONV
extern fuse_module_factory_t fuse_module_iconv_factory;
#endif
static pthread_key_t fuse_context_key;
static pthread_mutex_t fuse_context_lock = PTHREAD_MUTEX_INITIALIZER;
static int fuse_context_ref;
static struct fuse_module *fuse_modules = NULL;
static int fuse_register_module(const char *name,
fuse_module_factory_t factory,
struct fusemod_so *so)
{
struct fuse_module *mod;
mod = calloc(1, sizeof(struct fuse_module));
if (!mod) {
fprintf(stderr, "fuse: failed to allocate module\n");
return -1;
}
mod->name = strdup(name);
if (!mod->name) {
fprintf(stderr, "fuse: failed to allocate module name\n");
free(mod);
return -1;
}
mod->factory = factory;
mod->ctr = 0;
mod->so = so;
if (mod->so)
mod->so->ctr++;
mod->next = fuse_modules;
fuse_modules = mod;
return 0;
}
static void fuse_unregister_module(struct fuse_module *m)
{
struct fuse_module **mp;
for (mp = &fuse_modules; *mp; mp = &(*mp)->next) {
if (*mp == m) {
*mp = (*mp)->next;
break;
}
}
free(m->name);
free(m);
}
static int fuse_load_so_module(const char *module)
{
int ret = -1;
char *tmp;
struct fusemod_so *so;
fuse_module_factory_t factory;
tmp = malloc(strlen(module) + 64);
if (!tmp) {
fprintf(stderr, "fuse: memory allocation failed\n");
return -1;
}
sprintf(tmp, "libfusemod_%s.so", module);
so = calloc(1, sizeof(struct fusemod_so));
if (!so) {
fprintf(stderr, "fuse: failed to allocate module so\n");
goto out;
}
so->handle = dlopen(tmp, RTLD_NOW);
if (so->handle == NULL) {
fprintf(stderr, "fuse: dlopen(%s) failed: %s\n",
tmp, dlerror());
goto out_free_so;
}
sprintf(tmp, "fuse_module_%s_factory", module);
*(void**)(&factory) = dlsym(so->handle, tmp);
if (factory == NULL) {
fprintf(stderr, "fuse: symbol <%s> not found in module: %s\n",
tmp, dlerror());
goto out_dlclose;
}
ret = fuse_register_module(module, factory, so);
if (ret)
goto out_dlclose;
out:
free(tmp);
return ret;
out_dlclose:
dlclose(so->handle);
out_free_so:
free(so);
goto out;
}
static struct fuse_module *fuse_find_module(const char *module)
{
struct fuse_module *m;
for (m = fuse_modules; m; m = m->next) {
if (strcmp(module, m->name) == 0) {
m->ctr++;
break;
}
}
return m;
}
static struct fuse_module *fuse_get_module(const char *module)
{
struct fuse_module *m;
pthread_mutex_lock(&fuse_context_lock);
m = fuse_find_module(module);
if (!m) {
int err = fuse_load_so_module(module);
if (!err)
m = fuse_find_module(module);
}
pthread_mutex_unlock(&fuse_context_lock);
return m;
}
static void fuse_put_module(struct fuse_module *m)
{
pthread_mutex_lock(&fuse_context_lock);
if (m->so)
assert(m->ctr > 0);
/* Builtin modules may already have m->ctr == 0 */
if (m->ctr > 0)
m->ctr--;
if (!m->ctr && m->so) {
struct fusemod_so *so = m->so;
assert(so->ctr > 0);
so->ctr--;
if (!so->ctr) {
struct fuse_module **mp;
for (mp = &fuse_modules; *mp;) {
if ((*mp)->so == so)
fuse_unregister_module(*mp);
else
mp = &(*mp)->next;
}
dlclose(so->handle);
free(so);
}
} else if (!m->ctr) {
fuse_unregister_module(m);
}
pthread_mutex_unlock(&fuse_context_lock);
}
static void init_list_head(struct list_head *list)
{
list->next = list;
list->prev = list;
}
static int list_empty(const struct list_head *head)
{
return head->next == head;
}
static void list_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;
}
static inline void list_add_head(struct list_head *new, struct list_head *head)
{
list_add(new, head, head->next);
}
static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
list_add(new, head->prev, head);
}
static inline void list_del(struct list_head *entry)
{
struct list_head *prev = entry->prev;
struct list_head *next = entry->next;
next->prev = prev;
prev->next = next;
}
static inline int lru_enabled(struct fuse *f)
{
return f->conf.remember > 0;
}
static struct node_lru *node_lru(struct node *node)
{
return (struct node_lru *) node;
}
static size_t get_node_size(struct fuse *f)
{
if (lru_enabled(f))
return sizeof(struct node_lru);
else
return sizeof(struct node);
}
#ifdef FUSE_NODE_SLAB
static struct node_slab *list_to_slab(struct list_head *head)
{
return (struct node_slab *) head;
}
static struct node_slab *node_to_slab(struct fuse *f, struct node *node)
{
return (struct node_slab *) (((uintptr_t) node) & ~((uintptr_t) f->pagesize - 1));
}
static int alloc_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;
}
static struct 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;
}
static void free_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);
}
static void free_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
static struct node *alloc_node(struct fuse *f)
{
return (struct node *) calloc(1, get_node_size(f));
}
static void free_node_mem(struct fuse *f, struct node *node)
{
(void) f;
free(node);
}
#endif
static size_t id_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;
}
static struct 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;
}
static struct node *get_node(struct fuse *f, 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);
static void remove_node_lru(struct node *node)
{
struct node_lru *lnode = node_lru(node);
list_del(&lnode->lru);
init_list_head(&lnode->lru);
}
static void set_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);
}
static void free_node(struct fuse *f, struct node *node)
{
if (node->name != node->inline_name)
free(node->name);
free_node_mem(f, node);
}
static void node_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;
}
static void remerge_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;
}
}
}
static void unhash_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);
}
static fuse_ino_t next_id(struct fuse *f)
{
do {
f->ctr = (f->ctr + 1) & 0xffffffff;
if (!f->ctr)
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 int lookup_path_in_cache(struct fuse *f,
const char *path, fuse_ino_t *inop)
{
char *tmp = strdup(path);
if (!tmp)
return -ENOMEM;
pthread_mutex_lock(&f->lock);
fuse_ino_t ino = FUSE_ROOT_ID;
int err = 0;
char *save_ptr;
char *path_element = strtok_r(tmp, "/", &save_ptr);
while (path_element != NULL) {
struct node *node = lookup_node(f, ino, path_element);
if (node == NULL) {
err = -ENOENT;
break;
}
ino = node->nodeid;
path_element = strtok_r(NULL, "/", &save_ptr);
}
pthread_mutex_unlock(&f->lock);
free(tmp);
if (!err)
*inop = ino;
return err;
}
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 %llu (w)\n",
msg, (unsigned long long) wnode->nodeid);
} else {
fprintf(stderr, "%s %llu\n",
msg, (unsigned long long) 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_nullok(struct fuse *f, fuse_ino_t nodeid, char **path)
{
int err = 0;
if (f->conf.nullpath_ok) {
*path = NULL;
} else {
err = get_path_common(f, nodeid, NULL, path, NULL);
if (err == -ENOENT)
err = 0;
}
return err;
}
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);
}
#if defined(__FreeBSD__)
#define CHECK_DIR_LOOP
#endif
#if defined(CHECK_DIR_LOOP)
static int check_dir_loop(struct fuse *f,
fuse_ino_t nodeid1, const char *name1,
fuse_ino_t nodeid2, const char *name2)
{
struct node *node, *node1, *node2;
fuse_ino_t id1, id2;
node1 = lookup_node(f, nodeid1, name1);
id1 = node1 ? node1->nodeid : nodeid1;
node2 = lookup_node(f, nodeid2, name2);
id2 = node2 ? node2->nodeid : nodeid2;
for (node = get_node(f, id2); node->nodeid != FUSE_ROOT_ID;
node = node->parent) {
if (node->name == NULL || node->parent == NULL)
break;
if (node->nodeid != id2 && node->nodeid == id1)
return -EINVAL;
}
if (node2)
{
for (node = get_node(f, id1); node->nodeid != FUSE_ROOT_ID;
node = node->parent) {
if (node->name == NULL || node->parent == NULL)
break;
if (node->nodeid != id1 && node->nodeid == id2)
return -ENOTEMPTY;
}
}
return 0;
}
#endif
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);
#if defined(CHECK_DIR_LOOP)
if (name1)
{
// called during rename; perform dir loop check
err = check_dir_loop(f, nodeid1, name1, nodeid2, name2);
if (err)
goto out_unlock;
}
#endif
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);
}
#if defined(CHECK_DIR_LOOP)
out_unlock:
#endif
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);
}
static void forget_node(struct fuse *f, fuse_ino_t nodeid, 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, int hide)
{
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) {
if (hide) {
fprintf(stderr, "fuse: hidden file got created during hiding\n");
err = -EBUSY;
goto out;
}
unlink_node(f, newnode);
}
unhash_name(f, node);
if (hash_name(f, node, newdir, newname) == -1) {
err = -ENOMEM;
goto out;
}
if (hide)
node->is_hidden = 1;
out:
pthread_mutex_unlock(&f->lock);
return err;
}
static int exchange_node(struct fuse *f, fuse_ino_t olddir, const char *oldname,
fuse_ino_t newdir, const char *newname)
{
struct node *oldnode;
struct node *newnode;
int err;
pthread_mutex_lock(&f->lock);
oldnode = lookup_node(f, olddir, oldname);
newnode = lookup_node(f, newdir, newname);
if (oldnode)
unhash_name(f, oldnode);
if (newnode)
unhash_name(f, newnode);
err = -ENOMEM;
if (oldnode) {
if (hash_name(f, oldnode, newdir, newname) == -1)
goto out;
}
if (newnode) {
if (hash_name(f, newnode, olddir, oldname) == -1)
goto out;
}
err = 0;
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);
}
static const char* file_info_string(struct fuse_file_info *fi,
char* buf, size_t len)
{
if(fi == NULL)
return "NULL";
snprintf(buf, len, "%llu", (unsigned long long) fi->fh);
return buf;
}
int fuse_fs_getattr(struct fuse_fs *fs, const char *path, struct stat *buf,
struct fuse_file_info *fi)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.getattr) {
if (fs->debug) {
char buf[10];
fprintf(stderr, "getattr[%s] %s\n",
file_info_string(fi, buf, sizeof(buf)),
path);
}
return fs->op.getattr(path, buf, fi);
} else {
return -ENOSYS;
}
}
int fuse_fs_rename(struct fuse_fs *fs, const char *oldpath,
const char *newpath, unsigned int flags)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.rename) {
if (fs->debug)
fprintf(stderr, "rename %s %s 0x%x\n", oldpath, newpath,
flags);
return fs->op.rename(oldpath, newpath, flags);
} else {
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, const char *path,
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(path, 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[%llu] 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[%llu] 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++)
if (!(buf->buf[0].flags & FUSE_BUF_IS_FD))
free(buf->buf[i].mem);
free(buf);
}
}
int fuse_fs_read_buf(struct fuse_fs *fs, const char *path,
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(path, 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(path, 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) > 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, const char *path, char *mem, 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) {
struct fuse_bufvec *buf = NULL;
res = fs->op.read_buf(path, &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);
} else {
res = fs->op.read(path, mem, size, off, fi);
}
if (fs->debug && res >= 0)
fprintf(stderr, " read[%llu] %u bytes from %llu\n",
(unsigned long long) fi->fh,
res,
(unsigned long long) off);
if (res >= 0 && res > (int) size)
fprintf(stderr, "fuse: read too many bytes\n");
return res;
} else {
return -ENOSYS;
}
}
int fuse_fs_write_buf(struct fuse_fs *fs, const char *path,
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(path, 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(path, 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 *path, 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, path, &bufv, off, fi);
}
int fuse_fs_fsync(struct fuse_fs *fs, const char *path, 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(path, datasync, fi);
} else {
return -ENOSYS;
}
}
int fuse_fs_fsyncdir(struct fuse_fs *fs, const char *path, 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(path, datasync, fi);
} else {
return -ENOSYS;
}
}
int fuse_fs_flush(struct fuse_fs *fs, const char *path,
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(path, 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, const char *path,
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(path, fi);
} else {
return 0;
}
}
int fuse_fs_readdir(struct fuse_fs *fs, const char *path, void *buf,
fuse_fill_dir_t filler, off_t off,
struct fuse_file_info *fi,
enum fuse_readdir_flags flags)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.readdir) {
if (fs->debug) {
fprintf(stderr, "readdir%s[%llu] from %llu\n",
(flags & FUSE_READDIR_PLUS) ? "plus" : "",
(unsigned long long) fi->fh,
(unsigned long long) off);
}
return fs->op.readdir(path, buf, filler, off, fi, flags);
} else {
return -ENOSYS;
}
}
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, const char *path,
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(path, fi, cmd, lock);
} else {
return -ENOSYS;
}
}
int fuse_fs_flock(struct fuse_fs *fs, const char *path,
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(path, fi, op);
} else {
return -ENOSYS;
}
}
int fuse_fs_chown(struct fuse_fs *fs, const char *path, uid_t uid,
gid_t gid, struct fuse_file_info *fi)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.chown) {
if (fs->debug) {
char buf[10];
fprintf(stderr, "chown[%s] %s %lu %lu\n",
file_info_string(fi, buf, sizeof(buf)),
path, (unsigned long) uid, (unsigned long) gid);
}
return fs->op.chown(path, uid, gid, fi);
} else {
return -ENOSYS;
}
}
int fuse_fs_truncate(struct fuse_fs *fs, const char *path, off_t size,
struct fuse_file_info *fi)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.truncate) {
if (fs->debug) {
char buf[10];
fprintf(stderr, "truncate[%s] %llu\n",
file_info_string(fi, buf, sizeof(buf)),
(unsigned long long) size);
}
return fs->op.truncate(path, size, fi);
} else {
return -ENOSYS;
}
}
int fuse_fs_utimens(struct fuse_fs *fs, const char *path,
const struct timespec tv[2], struct fuse_file_info *fi)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.utimens) {
if (fs->debug) {
char buf[10];
fprintf(stderr, "utimens[%s] %s %li.%09lu %li.%09lu\n",
file_info_string(fi, buf, sizeof(buf)),
path, tv[0].tv_sec, tv[0].tv_nsec,
tv[1].tv_sec, tv[1].tv_nsec);
}
return fs->op.utimens(path, tv, fi);
} else {
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, const char *path, int cmd, void *arg,
struct fuse_file_info *fi, unsigned int flags, void *data)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.ioctl) {
if (fs->debug)
fprintf(stderr, "ioctl[%llu] 0x%x flags: 0x%x\n",
(unsigned long long) fi->fh, cmd, flags);
return fs->op.ioctl(path, cmd, arg, fi, flags, data);
} else
return -ENOSYS;
}
int fuse_fs_poll(struct fuse_fs *fs, const char *path,
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, events 0x%x\n",
(unsigned long long) fi->fh, ph,
fi->poll_events);
res = fs->op.poll(path, 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, const char *path, 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 %s mode %x, offset: %llu, length: %llu\n",
path,
mode,
(unsigned long long) offset,
(unsigned long long) length);
return fs->op.fallocate(path, mode, offset, length, fi);
} else
return -ENOSYS;
}
ssize_t fuse_fs_copy_file_range(struct fuse_fs *fs, const char *path_in,
struct fuse_file_info *fi_in, off_t off_in,
const char *path_out,
struct fuse_file_info *fi_out, off_t off_out,
size_t len, int flags)
{
fuse_get_context()->private_data = fs->user_data;
if (fs->op.copy_file_range) {
if (fs->debug)
fprintf(stderr, "copy_file_range from %s:%llu to "
"%s:%llu, length: %llu\n",
path_in,
(unsigned long long) off_in,
path_out,
(unsigned long long) off_out,
(unsigned long long) len);
return fs->op.copy_file_range(path_in, fi_in, off_in, path_out,
fi_out, off_out, len, flags);
} else
return -ENOSYS;
}
static int is_open(struct fuse *f, fuse_ino_t dir, const char *name)
{
struct node *node;
int isopen = 0;
pthread_mutex_lock(&f->lock);
node = lookup_node(f, dir, name);
if (node && node->open_count > 0)
isopen = 1;
pthread_mutex_unlock(&f->lock);
return isopen;
}
static char *hidden_name(struct fuse *f, fuse_ino_t dir, const char *oldname,
char *newname, size_t bufsize)
{
struct stat buf;
struct node *node;
struct node *newnode;
char *newpath;
int res;
int failctr = 10;
do {
pthread_mutex_lock(&f->lock);
node = lookup_node(f, dir, oldname);
if (node == NULL) {
pthread_mutex_unlock(&f->lock);
return NULL;
}
do {
f->hidectr ++;
snprintf(newname, bufsize, ".fuse_hidden%08x%08x",
(unsigned int) node->nodeid, f->hidectr);
newnode = lookup_node(f, dir, newname);
} while(newnode);
res = try_get_path(f, dir, newname, &newpath, NULL, false);
pthread_mutex_unlock(&f->lock);
if (res)
break;
memset(&buf, 0, sizeof(buf));
res = fuse_fs_getattr(f->fs, newpath, &buf, NULL);
if (res == -ENOENT)
break;
free(newpath);
newpath = NULL;
} while(res == 0 && --failctr);
return newpath;
}
static int hide_node(struct fuse *f, const char *oldpath,
fuse_ino_t dir, const char *oldname)
{
char newname[64];
char *newpath;
int err = -EBUSY;
newpath = hidden_name(f, dir, oldname, newname, sizeof(newname));
if (newpath) {
err = fuse_fs_rename(f->fs, oldpath, newpath, 0);
if (!err)
err = rename_node(f, dir, oldname, dir, newname, 1);
free(newpath);
}
return err;
}
static int mtime_eq(const struct stat *stbuf, const struct timespec *ts)
{
return stbuf->st_mtime == ts->tv_sec &&
ST_MTIM_NSEC(stbuf) == ts->tv_nsec;
}
#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();
}
}
static void update_stat(struct node *node, const struct stat *stbuf)
{
if (node->cache_valid && (!mtime_eq(stbuf, &node->mtime) ||
stbuf->st_size != node->size))
node->cache_valid = 0;
node->mtime.tv_sec = stbuf->st_mtime;
node->mtime.tv_nsec = ST_MTIM_NSEC(stbuf);
node->size = stbuf->st_size;
curr_time(&node->stat_updated);
}
static int do_lookup(struct fuse *f, fuse_ino_t nodeid, const char *name,
struct fuse_entry_param *e)
{
struct node *node;
node = find_node(f, nodeid, name);
if (node == NULL)
return -ENOMEM;
e->ino = node->nodeid;
e->generation = node->generation;
e->entry_timeout = f->conf.entry_timeout;
e->attr_timeout = f->conf.attr_timeout;
if (f->conf.auto_cache) {
pthread_mutex_lock(&f->lock);
update_stat(node, &e->attr);
pthread_mutex_unlock(&f->lock);
}
set_stat(f, e->ino, &e->attr);
return 0;
}
static int lookup_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));
res = fuse_fs_getattr(f->fs, path, &e->attr, fi);
if (res == 0) {
res = do_lookup(f, nodeid, name, e);
if (res == 0 && f->conf.debug) {
fprintf(stderr, " NODEID: %llu\n",
(unsigned long long) e->ino);
}
}
return res;
}
static struct fuse_context_i *fuse_get_context_internal(void)
{
return (struct fuse_context_i *) pthread_getspecific(fuse_context_key);
}
static struct fuse_context_i *fuse_create_context(struct fuse *f)
{
struct fuse_context_i *c = fuse_get_context_internal();
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);
} else {
memset(c, 0, sizeof(*c));
}
c->ctx.fuse = f;
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_create_context(req_fuse(req));
const struct fuse_ctx *ctx = fuse_req_ctx(req);
c->req = 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,
struct fuse_config *cfg)
{
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, cfg);
}
static void fuse_lib_init(void *data, struct fuse_conn_info *conn)
{
struct fuse *f = (struct fuse *) data;
fuse_create_context(f);
if(conn->capable & FUSE_CAP_EXPORT_SUPPORT)
conn->want |= FUSE_CAP_EXPORT_SUPPORT;
fuse_fs_init(f->fs, conn, &f->conf);
}
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);
if (fs->m)
fuse_put_module(fs->m);
free(fs);
}
static void fuse_lib_destroy(void *data)
{
struct fuse *f = (struct fuse *) data;
fuse_create_context(f);
fuse_fs_destroy(f->fs);
f->fs = NULL;
}
static void fuse_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 && f->conf.negative_timeout != 0.0) {
e.ino = 0;
e.entry_timeout = f->conf.negative_timeout;
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);
}
static void do_forget(struct fuse *f, fuse_ino_t ino, 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);
}
static void fuse_lib_forget(fuse_req_t req, fuse_ino_t ino, 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);
}
static void fuse_lib_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
struct fuse *f = req_fuse_prepare(req);
struct stat buf;
char *path;
int err;
memset(&buf, 0, sizeof(buf));
if (fi != NULL)
err = get_path_nullok(f, ino, &path);
else
err = get_path(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_getattr(f->fs, path, &buf, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
if (!err) {
struct node *node;
pthread_mutex_lock(&f->lock);
node = get_node(f, ino);
if (node->is_hidden && buf.st_nlink > 0)
buf.st_nlink--;
if (f->conf.auto_cache)
update_stat(node, &buf);
pthread_mutex_unlock(&f->lock);
set_stat(f, ino, &buf);
fuse_reply_attr(req, &buf, f->conf.attr_timeout);
} else
reply_err(req, err);
}
int fuse_fs_chmod(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.chmod) {
if (fs->debug) {
char buf[10];
fprintf(stderr, "chmod[%s] %s %llo\n",
file_info_string(fi, buf, sizeof(buf)),
path, (unsigned long long) mode);
}
return fs->op.chmod(path, mode, fi);
}
else
return -ENOSYS;
}
static void fuse_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;
memset(&buf, 0, sizeof(buf));
if (fi != NULL)
err = get_path_nullok(f, ino, &path);
else
err = get_path(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = 0;
if (!err && (valid & FUSE_SET_ATTR_MODE))
err = fuse_fs_chmod(f->fs, path, attr->st_mode, fi);
if (!err && (valid & (FUSE_SET_ATTR_UID | FUSE_SET_ATTR_GID))) {
uid_t uid = (valid & FUSE_SET_ATTR_UID) ?
attr->st_uid : (uid_t) -1;
gid_t gid = (valid & FUSE_SET_ATTR_GID) ?
attr->st_gid : (gid_t) -1;
err = fuse_fs_chown(f->fs, path, uid, gid, fi);
}
if (!err && (valid & FUSE_SET_ATTR_SIZE)) {
err = fuse_fs_truncate(f->fs, path,
attr->st_size, fi);
}
#ifdef HAVE_UTIMENSAT
if (!err &&
(valid & (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_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 & FUSE_SET_ATTR_ATIME_NOW)
tv[0].tv_nsec = UTIME_NOW;
else if (valid & FUSE_SET_ATTR_ATIME)
tv[0] = attr->st_atim;
if (valid & FUSE_SET_ATTR_MTIME_NOW)
tv[1].tv_nsec = UTIME_NOW;
else if (valid & FUSE_SET_ATTR_MTIME)
tv[1] = attr->st_mtim;
err = fuse_fs_utimens(f->fs, path, tv, fi);
} else
#endif
if (!err &&
(valid & (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME)) ==
(FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_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 = fuse_fs_utimens(f->fs, path, tv, fi);
}
if (!err) {
err = fuse_fs_getattr(f->fs, path, &buf, fi);
}
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
if (!err) {
if (f->conf.auto_cache) {
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, f->conf.attr_timeout);
} 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, path, &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);
}
static void fuse_lib_unlink(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);
if (!f->conf.hard_remove && is_open(f, parent, name)) {
err = hide_node(f, path, parent, name);
} else {
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);
}
static void fuse_lib_rename(fuse_req_t req, fuse_ino_t olddir,
const char *oldname, fuse_ino_t newdir,
const char *newname, unsigned int flags)
{
struct fuse *f = req_fuse_prepare(req);
char *oldpath;
char *newpath;
struct node *wnode1;
struct node *wnode2;
int err;
err = get_path2(f, olddir, oldname, newdir, newname,
&oldpath, &newpath, &wnode1, &wnode2);
if (!err) {
struct fuse_intr_data d;
err = 0;
fuse_prepare_interrupt(f, req, &d);
if (!f->conf.hard_remove && !(flags & RENAME_EXCHANGE) &&
is_open(f, newdir, newname))
err = hide_node(f, newpath, newdir, newname);
if (!err) {
err = fuse_fs_rename(f->fs, oldpath, newpath, flags);
if (!err) {
if (flags & RENAME_EXCHANGE) {
err = exchange_node(f, olddir, oldname,
newdir, newname);
} else {
err = rename_node(f, olddir, oldname,
newdir, newname, 0);
}
}
}
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, const char *path,
struct fuse_file_info *fi)
{
struct node *node;
int unlink_hidden = 0;
fuse_fs_release(f->fs, path, fi);
pthread_mutex_lock(&f->lock);
node = get_node(f, ino);
assert(node->open_count > 0);
--node->open_count;
if (node->is_hidden && !node->open_count) {
unlink_hidden = 1;
node->is_hidden = 0;
}
pthread_mutex_unlock(&f->lock);
if(unlink_hidden) {
if (path) {
fuse_fs_unlink(f->fs, path);
} else if (f->conf.nullpath_ok) {
char *unlinkpath;
if (get_path(f, ino, &unlinkpath) == 0)
fuse_fs_unlink(f->fs, unlinkpath);
free_path(f, ino, unlinkpath);
}
}
}
static void fuse_lib_create(fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode,
struct fuse_file_info *fi)
{
struct fuse *f = req_fuse_prepare(req);
struct fuse_intr_data d;
struct fuse_entry_param e;
char *path;
int err;
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, path, fi);
else if (!S_ISREG(e.attr.st_mode)) {
err = -EIO;
fuse_fs_release(f->fs, path, fi);
forget_node(f, e.ino, 1);
} else {
if (f->conf.direct_io)
fi->direct_io = 1;
if (f->conf.kernel_cache)
fi->keep_cache = 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, path, 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;
}
static void open_auto_cache(struct fuse *f, fuse_ino_t ino, const char *path,
struct fuse_file_info *fi)
{
struct node *node;
pthread_mutex_lock(&f->lock);
node = get_node(f, ino);
if (node->cache_valid) {
struct timespec now;
curr_time(&now);
if (diff_timespec(&now, &node->stat_updated) >
f->conf.ac_attr_timeout) {
struct stat stbuf;
int err;
pthread_mutex_unlock(&f->lock);
err = fuse_fs_getattr(f->fs, path, &stbuf, fi);
pthread_mutex_lock(&f->lock);
if (!err)
update_stat(node, &stbuf);
else
node->cache_valid = 0;
}
}
if (node->cache_valid)
fi->keep_cache = 1;
node->cache_valid = 1;
pthread_mutex_unlock(&f->lock);
}
static void fuse_lib_open(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;
char *path;
int err;
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 (f->conf.direct_io)
fi->direct_io = 1;
if (f->conf.kernel_cache)
fi->keep_cache = 1;
if (f->conf.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);
if (fuse_reply_open(req, fi) == -ENOENT) {
/* The open syscall was interrupted, so it
must be cancelled */
fuse_do_release(f, ino, path, 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;
char *path;
int res;
res = get_path_nullok(f, ino, &path);
if (res == 0) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
res = fuse_fs_read_buf(f->fs, path, &buf, size, off, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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);
char *path;
int res;
res = get_path_nullok(f, ino, &path);
if (res == 0) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
res = fuse_fs_write_buf(f->fs, path, buf, off, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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);
char *path;
int err;
err = get_path_nullok(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_fsync(f->fs, path, datasync, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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 *) malloc(sizeof(struct fuse_dh));
if (dh == NULL) {
reply_err(req, -ENOMEM);
return;
}
memset(dh, 0, sizeof(struct fuse_dh));
dh->fuse = f;
dh->contents = NULL;
dh->first = NULL;
dh->len = 0;
dh->filled = 0;
dh->nodeid = ino;
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;
}
if (!err) {
if (fuse_reply_open(req, llfi) == -ENOENT) {
/* The opendir syscall was interrupted, so it
must be cancelled */
fuse_fs_releasedir(f->fs, path, &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);
}
static int extend_contents(struct fuse_dh *dh, unsigned minsize)
{
if (minsize > dh->size) {
char *newptr;
unsigned newsize = dh->size;
if (!newsize)
newsize = 1024;
while (newsize < minsize) {
if (newsize >= 0x80000000)
newsize = 0xffffffff;
else
newsize *= 2;
}
newptr = (char *) realloc(dh->contents, newsize);
if (!newptr) {
dh->error = -ENOMEM;
return -1;
}
dh->contents = newptr;
dh->size = newsize;
}
return 0;
}
static int fuse_add_direntry_to_dh(struct fuse_dh *dh, const char *name,
struct stat *st)
{
struct fuse_direntry *de;
de = malloc(sizeof(struct fuse_direntry));
if (!de) {
dh->error = -ENOMEM;
return -1;
}
de->name = strdup(name);
if (!de->name) {
dh->error = -ENOMEM;
free(de);
return -1;
}
de->stat = *st;
de->next = NULL;
*dh->last = de;
dh->last = &de->next;
return 0;
}
static fuse_ino_t lookup_nodeid(struct fuse *f, fuse_ino_t parent,
const char *name)
{
struct node *node;
fuse_ino_t res = FUSE_UNKNOWN_INO;
pthread_mutex_lock(&f->lock);
node = lookup_node(f, parent, name);
if (node)
res = node->nodeid;
pthread_mutex_unlock(&f->lock);
return res;
}
static int fill_dir(void *dh_, const char *name, const struct stat *statp,
off_t off, enum fuse_fill_dir_flags flags)
{
struct fuse_dh *dh = (struct fuse_dh *) dh_;
struct stat stbuf;
if ((flags & ~FUSE_FILL_DIR_PLUS) != 0) {
dh->error = -EIO;
return 1;
}
if (statp)
stbuf = *statp;
else {
memset(&stbuf, 0, sizeof(stbuf));
stbuf.st_ino = FUSE_UNKNOWN_INO;
}
if (!dh->fuse->conf.use_ino) {
stbuf.st_ino = FUSE_UNKNOWN_INO;
if (dh->fuse->conf.readdir_ino) {
stbuf.st_ino = (ino_t)
lookup_nodeid(dh->fuse, dh->nodeid, name);
}
}
if (off) {
size_t newlen;
if (dh->filled) {
dh->error = -EIO;
return 1;
}
if (dh->first) {
dh->error = -EIO;
return 1;
}
if (extend_contents(dh, dh->needlen) == -1)
return 1;
newlen = dh->len +
fuse_add_direntry(dh->req, dh->contents + dh->len,
dh->needlen - dh->len, name,
&stbuf, off);
if (newlen > dh->needlen)
return 1;
dh->len = newlen;
} else {
dh->filled = 1;
if (fuse_add_direntry_to_dh(dh, name, &stbuf) == -1)
return 1;
}
return 0;
}
static int is_dot_or_dotdot(const char *name)
{
return name[0] == '.' && (name[1] == '\0' ||
(name[1] == '.' && name[2] == '\0'));
}
static int fill_dir_plus(void *dh_, const char *name, const struct stat *statp,
off_t off, enum fuse_fill_dir_flags flags)
{
struct fuse_dh *dh = (struct fuse_dh *) dh_;
struct fuse_entry_param e = {
/* ino=0 tells the kernel to ignore readdirplus stat info */
.ino = 0,
};
struct fuse *f = dh->fuse;
int res;
if ((flags & ~FUSE_FILL_DIR_PLUS) != 0) {
dh->error = -EIO;
return 1;
}
if (off && statp && (flags & FUSE_FILL_DIR_PLUS)) {
e.attr = *statp;
if (!is_dot_or_dotdot(name)) {
res = do_lookup(f, dh->nodeid, name, &e);
if (res) {
dh->error = res;
return 1;
}
}
} else {
e.attr.st_ino = FUSE_UNKNOWN_INO;
if (!f->conf.use_ino && f->conf.readdir_ino) {
e.attr.st_ino = (ino_t)
lookup_nodeid(f, dh->nodeid, name);
}
}
if (off) {
size_t newlen;
if (dh->filled) {
dh->error = -EIO;
return 1;
}
if (dh->first) {
dh->error = -EIO;
return 1;
}
if (extend_contents(dh, dh->needlen) == -1)
return 1;
newlen = dh->len +
fuse_add_direntry_plus(dh->req, dh->contents + dh->len,
dh->needlen - dh->len, name,
&e, off);
if (newlen > dh->needlen)
return 1;
dh->len = newlen;
} else {
dh->filled = 1;
if (fuse_add_direntry_to_dh(dh, name, &e.attr) == -1)
return 1;
}
return 0;
}
static void free_direntries(struct fuse_direntry *de)
{
while (de) {
struct fuse_direntry *next = de->next;
free(de->name);
free(de);
de = next;
}
}
static int readdir_fill(struct fuse *f, fuse_req_t req, fuse_ino_t ino,
size_t size, off_t off, struct fuse_dh *dh,
struct fuse_file_info *fi,
enum fuse_readdir_flags flags)
{
char *path;
int err;
if (f->fs->op.readdir)
err = get_path_nullok(f, ino, &path);
else
err = get_path(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_fill_dir_t filler = fill_dir;
if (flags & FUSE_READDIR_PLUS)
filler = fill_dir_plus;
free_direntries(dh->first);
dh->first = NULL;
dh->last = &dh->first;
dh->len = 0;
dh->error = 0;
dh->needlen = size;
dh->filled = 0;
dh->req = req;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_readdir(f->fs, path, dh, filler, off, fi, flags);
fuse_finish_interrupt(f, req, &d);
dh->req = NULL;
if (!err)
err = dh->error;
if (err)
dh->filled = 0;
free_path(f, ino, path);
}
return err;
}
static int readdir_fill_from_list(fuse_req_t req, struct fuse_dh *dh,
off_t off, enum fuse_readdir_flags flags)
{
off_t pos;
struct fuse_direntry *de = dh->first;
dh->len = 0;
if (extend_contents(dh, dh->needlen) == -1)
return dh->error;
for (pos = 0; pos < off; pos++) {
if (!de)
break;
de = de->next;
}
while (de) {
char *p = dh->contents + dh->len;
unsigned rem = dh->needlen - dh->len;
unsigned thislen;
unsigned newlen;
pos++;
if (flags & FUSE_READDIR_PLUS) {
struct fuse_entry_param e = {
.ino = 0,
.attr = de->stat,
};
thislen = fuse_add_direntry_plus(req, p, rem,
de->name, &e, pos);
} else {
thislen = fuse_add_direntry(req, p, rem,
de->name, &de->stat, pos);
}
newlen = dh->len + thislen;
if (newlen > dh->needlen)
break;
dh->len = newlen;
de = de->next;
}
return 0;
}
static void fuse_readdir_common(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *llfi,
enum fuse_readdir_flags flags)
{
struct fuse *f = req_fuse_prepare(req);
struct fuse_file_info fi;
struct fuse_dh *dh = get_dirhandle(llfi, &fi);
int err;
pthread_mutex_lock(&dh->lock);
/* According to SUS, directory contents need to be refreshed on
rewinddir() */
if (!off)
dh->filled = 0;
if (!dh->filled) {
err = readdir_fill(f, req, ino, size, off, dh, &fi, flags);
if (err) {
reply_err(req, err);
goto out;
}
}
if (dh->filled) {
dh->needlen = size;
err = readdir_fill_from_list(req, dh, off, flags);
if (err) {
reply_err(req, err);
goto out;
}
}
fuse_reply_buf(req, dh->contents, dh->len);
out:
pthread_mutex_unlock(&dh->lock);
}
static void fuse_lib_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *llfi)
{
fuse_readdir_common(req, ino, size, off, llfi, 0);
}
static void fuse_lib_readdirplus(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *llfi)
{
fuse_readdir_common(req, ino, size, off, llfi, FUSE_READDIR_PLUS);
}
static void fuse_lib_releasedir(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_file_info fi;
struct fuse_dh *dh = get_dirhandle(llfi, &fi);
char *path;
get_path_nullok(f, ino, &path);
fuse_prepare_interrupt(f, req, &d);
fuse_fs_releasedir(f->fs, path, &fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
pthread_mutex_lock(&dh->lock);
pthread_mutex_unlock(&dh->lock);
pthread_mutex_destroy(&dh->lock);
free_direntries(dh->first);
free(dh->contents);
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;
char *path;
int err;
get_dirhandle(llfi, &fi);
err = get_path_nullok(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_fsyncdir(f->fs, path, datasync, &fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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);
}
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,
const char *path, 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, path, fi);
errlock = fuse_fs_lock(f->fs, path, 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;
char *path;
int err = 0;
get_path_nullok(f, ino, &path);
if (fi->flush) {
err = fuse_flush_common(f, req, ino, path, fi);
if (err == -ENOSYS)
err = 0;
}
fuse_prepare_interrupt(f, req, &d);
fuse_do_release(f, ino, path, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
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);
char *path;
int err;
get_path_nullok(f, ino, &path);
err = fuse_flush_common(f, req, ino, path, fi);
free_path(f, ino, path);
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);
char *path;
int err;
err = get_path_nullok(f, ino, &path);
if (!err) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_lock(f->fs, path, fi, cmd, lock);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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);
char *path;
int err;
err = get_path_nullok(f, ino, &path);
if (err == 0) {
struct fuse_intr_data d;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_flock(f->fs, path, fi, op);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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, int cmd, void *arg,
struct fuse_file_info *llfi, unsigned int flags,
const void *in_buf, size_t in_bufsz,
size_t out_bufsz)
{
struct fuse *f = req_fuse_prepare(req);
struct fuse_intr_data d;
struct fuse_file_info fi;
char *path, *out_buf = NULL;
int err;
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 && in_bufsz)
memcpy(out_buf, in_buf, in_bufsz);
err = get_path_nullok(f, ino, &path);
if (err)
goto err;
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_ioctl(f->fs, path, cmd, arg, &fi, flags,
out_buf ?: (void *)in_buf);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
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;
char *path;
int err;
unsigned revents = 0;
err = get_path_nullok(f, ino, &path);
if (!err) {
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_poll(f->fs, path, fi, ph, &revents);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
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;
char *path;
int err;
err = get_path_nullok(f, ino, &path);
if (!err) {
fuse_prepare_interrupt(f, req, &d);
err = fuse_fs_fallocate(f->fs, path, mode, offset, length, fi);
fuse_finish_interrupt(f, req, &d);
free_path(f, ino, path);
}
reply_err(req, err);
}
static void fuse_lib_copy_file_range(fuse_req_t req, fuse_ino_t nodeid_in,
off_t off_in, struct fuse_file_info *fi_in,
fuse_ino_t nodeid_out, off_t off_out,
struct fuse_file_info *fi_out, size_t len,
int flags)
{
struct fuse *f = req_fuse_prepare(req);
struct fuse_intr_data d;
char *path_in, *path_out;
int err;
ssize_t res;
err = get_path_nullok(f, nodeid_in, &path_in);
if (err) {
reply_err(req, err);
return;
}
err = get_path_nullok(f, nodeid_out, &path_out);
if (err) {
free_path(f, nodeid_in, path_in);
reply_err(req, err);
return;
}
fuse_prepare_interrupt(f, req, &d);
res = fuse_fs_copy_file_range(f->fs, path_in, fi_in, off_in, path_out,
fi_out, off_out, len, flags);
fuse_finish_interrupt(f, req, &d);
if (res >= 0)
fuse_reply_write(req, res);
else
reply_err(req, res);
free_path(f, nodeid_in, path_in);
free_path(f, nodeid_out, path_out);
}
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,
.readdirplus = fuse_lib_readdirplus,
.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);
}
struct fuse_session *fuse_get_session(struct fuse *f)
{
return f->se;
}
static int fuse_session_loop_remember(struct fuse *f)
{
struct fuse_session *se = f->se;
int res = 0;
struct timespec now;
time_t next_clean;
struct pollfd fds = {
.fd = se->fd,
.events = POLLIN
};
struct fuse_buf fbuf = {
.mem = NULL,
};
curr_time(&now);
next_clean = now.tv_sec;
while (!fuse_session_exited(se)) {
unsigned timeout;
curr_time(&now);
if (now.tv_sec < next_clean)
timeout = next_clean - now.tv_sec;
else
timeout = 0;
res = poll(&fds, 1, timeout * 1000);
if (res == -1) {
if (errno == -EINTR)
continue;
else
break;
} else if (res > 0) {
res = fuse_session_receive_buf_int(se, &fbuf, NULL);
if (res == -EINTR)
continue;
if (res <= 0)
break;
fuse_session_process_buf_int(se, &fbuf, NULL);
} else {
timeout = fuse_clean_cache(f);
curr_time(&now);
next_clean = now.tv_sec + timeout;
}
}
free(fbuf.mem);
fuse_session_reset(se);
return res < 0 ? -1 : 0;
}
int fuse_loop(struct fuse *f)
{
if (!f)
return -1;
if (lru_enabled(f))
return fuse_session_loop_remember(f);
return fuse_session_loop(f->se);
}
FUSE_SYMVER(".symver fuse_loop_mt_32,fuse_loop_mt@@FUSE_3.2");
int fuse_loop_mt_32(struct fuse *f, struct fuse_loop_config *config)
{
if (f == NULL)
return -1;
int res = fuse_start_cleanup_thread(f);
if (res)
return -1;
res = fuse_session_loop_mt_32(fuse_get_session(f), config);
fuse_stop_cleanup_thread(f);
return res;
}
int fuse_loop_mt_31(struct fuse *f, int clone_fd);
FUSE_SYMVER(".symver fuse_loop_mt_31,fuse_loop_mt@FUSE_3.0");
int fuse_loop_mt_31(struct fuse *f, int clone_fd)
{
struct fuse_loop_config config;
config.clone_fd = clone_fd;
config.max_idle_threads = 10;
return fuse_loop_mt_32(f, &config);
}
void fuse_exit(struct fuse *f)
{
fuse_session_exit(f->se);
}
struct fuse_context *fuse_get_context(void)
{
struct fuse_context_i *c = fuse_get_context_internal();
if (c)
return &c->ctx;
else
return NULL;
}
int fuse_getgroups(int size, gid_t list[])
{
struct fuse_context_i *c = fuse_get_context_internal();
if (!c)
return -EINVAL;
return fuse_req_getgroups(c->req, size, list);
}
int fuse_interrupted(void)
{
struct fuse_context_i *c = fuse_get_context_internal();
if (c)
return fuse_req_interrupted(c->req);
else
return 0;
}
int fuse_invalidate_path(struct fuse *f, const char *path) {
fuse_ino_t ino;
int err = lookup_path_in_cache(f, path, &ino);
if (err) {
return err;
}
return fuse_lowlevel_notify_inval_inode(f->se, ino, 0, 0);
}
#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("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("kernel_cache", kernel_cache, 1),
FUSE_LIB_OPT("auto_cache", auto_cache, 1),
FUSE_LIB_OPT("noauto_cache", auto_cache, 0),
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("entry_timeout=%lf", entry_timeout, 0),
FUSE_LIB_OPT("attr_timeout=%lf", attr_timeout, 0),
FUSE_LIB_OPT("ac_attr_timeout=%lf", ac_attr_timeout, 0),
FUSE_LIB_OPT("ac_attr_timeout=", ac_attr_timeout_set, 1),
FUSE_LIB_OPT("negative_timeout=%lf", negative_timeout, 0),
FUSE_LIB_OPT("noforget", remember, -1),
FUSE_LIB_OPT("remember=%u", remember, 0),
FUSE_LIB_OPT("modules=%s", modules, 0),
FUSE_OPT_END
};
static int fuse_lib_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
(void) arg; (void) outargs; (void) data; (void) key;
/* Pass through unknown options */
return 1;
}
static const struct fuse_opt fuse_help_opts[] = {
FUSE_LIB_OPT("modules=%s", modules, 1),
FUSE_OPT_KEY("modules=%s", FUSE_OPT_KEY_KEEP),
FUSE_OPT_END
};
static void print_module_help(const char *name,
fuse_module_factory_t *fac)
{
struct fuse_args a = FUSE_ARGS_INIT(0, NULL);
if (fuse_opt_add_arg(&a, "") == -1 ||
fuse_opt_add_arg(&a, "-h") == -1)
return;
printf("\nOptions for %s module:\n", name);
(*fac)(&a, NULL);
}
void fuse_lib_help(struct fuse_args *args)
{
/* These are not all options, but only the ones that
may be of interest to an end-user */
printf(
" -o kernel_cache cache files in kernel\n"
" -o [no]auto_cache enable caching based on modification times (off)\n"
" -o umask=M set file permissions (octal)\n"
" -o uid=N set file owner\n"
" -o gid=N set file group\n"
" -o entry_timeout=T cache timeout for names (1.0s)\n"
" -o negative_timeout=T cache timeout for deleted names (0.0s)\n"
" -o attr_timeout=T cache timeout for attributes (1.0s)\n"
" -o ac_attr_timeout=T auto cache timeout for attributes (attr_timeout)\n"
" -o noforget never forget cached inodes\n"
" -o remember=T remember cached inodes for T seconds (0s)\n"
" -o modules=M1[:M2...] names of modules to push onto filesystem stack\n");
/* Print low-level help */
fuse_lowlevel_help();
/* Print help for builtin modules */
print_module_help("subdir", &fuse_module_subdir_factory);
#ifdef HAVE_ICONV
print_module_help("iconv", &fuse_module_iconv_factory);
#endif
/* Parse command line options in case we need to
activate more modules */
struct fuse_config conf = { .modules = NULL };
if (fuse_opt_parse(args, &conf, fuse_help_opts,
fuse_lib_opt_proc) == -1
|| !conf.modules)
return;
char *module;
char *next;
struct fuse_module *m;
// Iterate over all modules
for (module = conf.modules; module; module = next) {
char *p;
for (p = module; *p && *p != ':'; p++);
next = *p ? p + 1 : NULL;
*p = '\0';
m = fuse_get_module(module);
if (m)
print_module_help(module, &m->factory);
}
}
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);
}
static int fuse_push_module(struct fuse *f, const char *module,
struct fuse_args *args)
{
struct fuse_fs *fs[2] = { f->fs, NULL };
struct fuse_fs *newfs;
struct fuse_module *m = fuse_get_module(module);
if (!m)
return -1;
newfs = m->factory(args, fs);
if (!newfs) {
fuse_put_module(m);
return -1;
}
newfs->m = m;
f->fs = newfs;
return 0;
}
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);
}
}
FUSE_SYMVER(".symver fuse_new_31,fuse_new@@FUSE_3.1");
struct fuse *fuse_new_31(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;
f = (struct fuse *) calloc(1, sizeof(struct fuse));
if (f == NULL) {
fprintf(stderr, "fuse: failed to allocate fuse object\n");
goto out;
}
f->conf.entry_timeout = 1.0;
f->conf.attr_timeout = 1.0;
f->conf.negative_timeout = 0.0;
f->conf.intr_signal = FUSE_DEFAULT_INTR_SIGNAL;
/* Parse options */
if (fuse_opt_parse(args, &f->conf, fuse_lib_opts,
fuse_lib_opt_proc) == -1)
goto out_free;
pthread_mutex_lock(&fuse_context_lock);
static int builtin_modules_registered = 0;
/* Have the builtin modules already been registered? */
if (builtin_modules_registered == 0) {
/* If not, register them. */
fuse_register_module("subdir", fuse_module_subdir_factory, NULL);
#ifdef HAVE_ICONV
fuse_register_module("iconv", fuse_module_iconv_factory, NULL);
#endif
builtin_modules_registered= 1;
}
pthread_mutex_unlock(&fuse_context_lock);
if (fuse_create_context_key() == -1)
goto out_free;
fs = fuse_fs_new(op, op_size, user_data);
if (!fs)
goto out_delete_context_key;
f->fs = fs;
/* Oh f**k, this is ugly! */
if (!fs->op.lock) {
llop.getlk = NULL;
llop.setlk = NULL;
}
f->pagesize = getpagesize();
init_list_head(&f->partial_slabs);
init_list_head(&f->full_slabs);
init_list_head(&f->lru_table);
if (f->conf.modules) {
char *module;
char *next;
for (module = f->conf.modules; module; module = next) {
char *p;
for (p = module; *p && *p != ':'; p++);
next = *p ? p + 1 : NULL;
*p = '\0';
if (module[0] &&
fuse_push_module(f, module, args) == -1)
goto out_free_fs;
}
}
if (!f->conf.ac_attr_timeout_set)
f->conf.ac_attr_timeout = f->conf.attr_timeout;
#if defined(__FreeBSD__) || defined(__NetBSD__)
/*
* In FreeBSD, we always use these settings as inode numbers
* are needed to make getcwd(3) work.
*/
f->conf.readdir_ino = 1;
#endif
f->se = fuse_session_new(args, &llop, sizeof(llop), f);
if (f->se == NULL)
goto out_free_fs;
if (f->conf.debug) {
fprintf(stderr, "nullpath_ok: %i\n", f->conf.nullpath_ok);
}
/* Trace topmost layer by default */
f->fs->debug = f->conf.debug;
f->ctr = 0;
f->generation = 0;
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:
if (f->fs->m)
fuse_put_module(f->fs->m);
free(f->fs);
free(f->conf.modules);
out_delete_context_key:
fuse_delete_context_key();
out_free:
free(f);
out:
return NULL;
}
/* Emulates 3.0-style fuse_new(), which processes --help */
struct fuse *fuse_new_30(struct fuse_args *args, const struct fuse_operations *op,
size_t op_size, void *private_data);
FUSE_SYMVER(".symver fuse_new_30,fuse_new@FUSE_3.0");
struct fuse *fuse_new_30(struct fuse_args *args,
const struct fuse_operations *op,
size_t op_size, void *user_data)
{
struct fuse_config conf;
memset(&conf, 0, sizeof(conf));
const struct fuse_opt opts[] = {
FUSE_LIB_OPT("-h", show_help, 1),
FUSE_LIB_OPT("--help", show_help, 1),
FUSE_OPT_END
};
if (fuse_opt_parse(args, &conf, opts,
fuse_lib_opt_proc) == -1)
return NULL;
if (conf.show_help) {
fuse_lib_help(args);
return NULL;
} else
return fuse_new_31(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) {
fuse_create_context(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) {
char *path;
if (try_get_path(f, node->nodeid, NULL, &path, NULL, false) == 0) {
fuse_fs_unlink(f->fs, path);
free(path);
}
}
}
}
}
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));
while (fuse_modules) {
fuse_put_module(fuse_modules);
}
free(f->id_table.array);
free(f->name_table.array);
pthread_mutex_destroy(&f->lock);
fuse_session_destroy(f->se);
free(f->conf.modules);
free(f);
fuse_delete_context_key();
}
int fuse_mount(struct fuse *f, const char *mountpoint) {
return fuse_session_mount(fuse_get_session(f), mountpoint);
}
void fuse_unmount(struct fuse *f) {
return fuse_session_unmount(fuse_get_session(f));
}
int fuse_version(void)
{
return FUSE_VERSION;
}
const char *fuse_pkgversion(void)
{
return PACKAGE_VERSION;
}
fuse_session_destroy
void fuse_session_destroy(struct fuse_session *se)
Definition: fuse_lowlevel.c:2621
fuse_reply_err
int fuse_reply_err(fuse_req_t req, int err)
Definition: fuse_lowlevel.c:312
fuse_bufvec::off
size_t off
Definition: fuse_common.h:679
fuse_session_new
struct fuse_session * fuse_session_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata)
Definition: fuse_lowlevel.c:2809
fuse_session_exit
void fuse_session_exit(struct fuse_session *se)
Definition: fuse_lowlevel.c:3037
fuse_conn_info::capable
unsigned capable
Definition: fuse_common.h:381
fuse_file_info::fh
uint64_t fh
Definition: fuse_common.h:72
fuse_session_loop
int fuse_session_loop(struct fuse_session *se)
Definition: fuse_loop.c:19
FUSE_FILL_DIR_PLUS
Definition: fuse.h:64
fuse_conn_info
Definition: fuse_common.h:343
fuse_file_info::writepage
unsigned int writepage
Definition: fuse_common.h:43
fuse_reply_ioctl
int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)
Definition: fuse_lowlevel.c:979
fuse_lowlevel_help
void fuse_lowlevel_help(void)
Definition: fuse_lowlevel.c:2611
fuse_file_info::direct_io
unsigned int direct_io
Definition: fuse_common.h:46
FUSE_BUF_IS_FD
Definition: fuse_common.h:555
fuse_add_direntry_plus
size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize, const char *name, const struct fuse_entry_param *e, off_t off)
Definition: fuse_lowlevel.c:357
fuse_reply_data
int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv, enum fuse_buf_copy_flags flags)
Definition: fuse_lowlevel.c:820
fuse_file_info::poll_events
uint32_t poll_events
Definition: fuse_common.h:79
fuse_req_ctx
const struct fuse_ctx * fuse_req_ctx(fuse_req_t req)
Definition: fuse_lowlevel.c:2343
fuse_stop_cleanup_thread
void fuse_stop_cleanup_thread(struct fuse *fuse)
Definition: fuse.c:4816
fuse_session_mount
int fuse_session_mount(struct fuse_session *se, const char *mountpoint)
Definition: fuse_lowlevel.c:2903
fuse_loop_config::max_idle_threads
unsigned int max_idle_threads
Definition: fuse_common.h:103
fuse_ctx::umask
mode_t umask
Definition: fuse_lowlevel.h:125
fuse_loop
int fuse_loop(struct fuse *f)
Definition: fuse.c:4516
fuse_fill_dir_flags
fuse_fill_dir_flags
Definition: fuse.h:54
fuse_opt_parse
int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
Definition: fuse_opt.c:397
fuse_lowlevel_notify_poll
int fuse_lowlevel_notify_poll(struct fuse_pollhandle *ph)
Definition: fuse_lowlevel.c:2124
fuse_req_t
struct fuse_req * fuse_req_t
Definition: fuse_lowlevel.h:49
fuse_entry_param::attr
struct stat attr
Definition: fuse_lowlevel.h:91
fuse_add_direntry
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Definition: fuse_lowlevel.c:267
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