| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> |
| |
| This program can be distributed under the terms of the GNU LGPL. |
| See the file COPYING.LIB |
| */ |
| |
| |
| /* For pthread_rwlock_t */ |
| #define _GNU_SOURCE |
| |
| #include "fuse_i.h" |
| #include "fuse_lowlevel.h" |
| #include "fuse_compat.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <limits.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <stdint.h> |
| #include <pthread.h> |
| #include <sys/param.h> |
| #include <sys/uio.h> |
| |
| /* FUSE flags: */ |
| |
| /** Enable debuging output */ |
| #define FUSE_DEBUG (1 << 1) |
| |
| /** If a file is removed but it's still open, don't hide the file but |
| remove it immediately */ |
| #define FUSE_HARD_REMOVE (1 << 2) |
| |
| /** Use st_ino field in getattr instead of generating inode numbers */ |
| #define FUSE_USE_INO (1 << 3) |
| |
| /** Make a best effort to fill in inode number in a readdir **/ |
| #define FUSE_READDIR_INO (1 << 5) |
| |
| /** Ignore file mode supplied by the filesystem, and create one based |
| on the 'umask' option */ |
| #define FUSE_SET_MODE (1 << 6) |
| |
| /** Ignore st_uid supplied by the filesystem and set it based on the |
| 'uid' option*/ |
| #define FUSE_SET_UID (1 << 7) |
| |
| /** Ignore st_gid supplied by the filesystem and set it based on the |
| 'gid' option*/ |
| #define FUSE_SET_GID (1 << 8) |
| |
| /** Bypass the page cache for read and write operations */ |
| #define FUSE_DIRECT_IO (1 << 9) |
| |
| /** If the FUSE_KERNEL_CACHE flag is given, then cached data will not |
| be flushed on open */ |
| #define FUSE_KERNEL_CACHE (1 << 10) |
| |
| #define FUSE_MAX_PATH 4096 |
| |
| struct fuse { |
| struct fuse_session *se; |
| int flags; |
| struct fuse_operations op; |
| int compat; |
| struct node **name_table; |
| size_t name_table_size; |
| struct node **id_table; |
| size_t id_table_size; |
| fuse_ino_t ctr; |
| unsigned int generation; |
| unsigned int hidectr; |
| pthread_mutex_t lock; |
| pthread_rwlock_t tree_lock; |
| void *user_data; |
| uid_t uid; |
| gid_t gid; |
| mode_t umask; |
| double entry_timeout; |
| double attr_timeout; |
| }; |
| |
| struct node { |
| struct node *name_next; |
| struct node *id_next; |
| fuse_ino_t nodeid; |
| unsigned int generation; |
| int refctr; |
| fuse_ino_t parent; |
| char *name; |
| uint64_t nlookup; |
| int open_count; |
| int is_hidden; |
| }; |
| |
| struct fuse_dirhandle { |
| pthread_mutex_t lock; |
| struct fuse *fuse; |
| char *contents; |
| int allocated; |
| unsigned len; |
| unsigned needlen; |
| int filled; |
| unsigned long fh; |
| int error; |
| fuse_ino_t nodeid; |
| }; |
| |
| static struct fuse_context *(*fuse_getcontext)(void) = NULL; |
| |
| #ifndef USE_UCLIBC |
| #define mutex_init(mut) pthread_mutex_init(mut, NULL) |
| #else |
| static void mutex_init(pthread_mutex_t *mut) |
| { |
| pthread_mutexattr_t attr; |
| pthread_mutexattr_init(&attr); |
| pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP); |
| pthread_mutex_init(mut, &attr); |
| pthread_mutexattr_destroy(&attr); |
| } |
| #endif |
| |
| static struct node *get_node_nocheck(struct fuse *f, fuse_ino_t nodeid) |
| { |
| size_t hash = nodeid % f->id_table_size; |
| struct node *node; |
| |
| for (node = f->id_table[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 %lu not found\n", |
| nodeid); |
| abort(); |
| } |
| return node; |
| } |
| |
| static void free_node(struct node *node) |
| { |
| free(node->name); |
| free(node); |
| } |
| |
| static void unhash_id(struct fuse *f, struct node *node) |
| { |
| size_t hash = node->nodeid % f->id_table_size; |
| struct node **nodep = &f->id_table[hash]; |
| |
| for (; *nodep != NULL; nodep = &(*nodep)->id_next) |
| if (*nodep == node) { |
| *nodep = node->id_next; |
| return; |
| } |
| } |
| |
| static void hash_id(struct fuse *f, struct node *node) |
| { |
| size_t hash = node->nodeid % f->id_table_size; |
| node->id_next = f->id_table[hash]; |
| f->id_table[hash] = node; |
| } |
| |
| static unsigned int name_hash(struct fuse *f, fuse_ino_t parent, const char *name) |
| { |
| unsigned int hash = *name; |
| |
| if (hash) |
| for (name += 1; *name != '\0'; name++) |
| hash = (hash << 5) - hash + *name; |
| |
| return (hash + parent) % f->name_table_size; |
| } |
| |
| static void unref_node(struct fuse *f, struct node *node); |
| |
| static void unhash_name(struct fuse *f, struct node *node) |
| { |
| if (node->name) { |
| size_t hash = name_hash(f, node->parent, node->name); |
| struct node **nodep = &f->name_table[hash]; |
| |
| for (; *nodep != NULL; nodep = &(*nodep)->name_next) |
| if (*nodep == node) { |
| *nodep = node->name_next; |
| node->name_next = NULL; |
| unref_node(f, get_node(f, node->parent)); |
| free(node->name); |
| node->name = NULL; |
| node->parent = 0; |
| return; |
| } |
| fprintf(stderr, "fuse internal error: unable to unhash node: %lu\n", |
| node->nodeid); |
| abort(); |
| } |
| } |
| |
| static int hash_name(struct fuse *f, struct node *node, fuse_ino_t parent, |
| const char *name) |
| { |
| size_t hash = name_hash(f, parent, name); |
| node->name = strdup(name); |
| if (node->name == NULL) |
| return -1; |
| |
| get_node(f, parent)->refctr ++; |
| node->parent = parent; |
| node->name_next = f->name_table[hash]; |
| f->name_table[hash] = node; |
| return 0; |
| } |
| |
| static void delete_node(struct fuse *f, struct node *node) |
| { |
| if (f->flags & FUSE_DEBUG) { |
| printf("delete: %lu\n", node->nodeid); |
| fflush(stdout); |
| } |
| assert(!node->name); |
| unhash_id(f, node); |
| free_node(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++; |
| if (!f->ctr) |
| f->generation ++; |
| } while (f->ctr == 0 || 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[hash]; node != NULL; node = node->name_next) |
| if (node->parent == parent && strcmp(node->name, name) == 0) |
| return node; |
| |
| return NULL; |
| } |
| |
| static struct node *find_node(struct fuse *f, fuse_ino_t parent, |
| const char *name) |
| { |
| struct node *node; |
| |
| pthread_mutex_lock(&f->lock); |
| node = lookup_node(f, parent, name); |
| if (node == NULL) { |
| node = (struct node *) calloc(1, sizeof(struct node)); |
| if (node == NULL) |
| goto out_err; |
| |
| node->refctr = 1; |
| node->nodeid = next_id(f); |
| node->open_count = 0; |
| node->is_hidden = 0; |
| node->generation = f->generation; |
| if (hash_name(f, node, parent, name) == -1) { |
| free(node); |
| node = NULL; |
| goto out_err; |
| } |
| hash_id(f, node); |
| } |
| node->nlookup ++; |
| out_err: |
| pthread_mutex_unlock(&f->lock); |
| return node; |
| } |
| |
| static char *add_name(char *buf, char *s, const char *name) |
| { |
| size_t len = strlen(name); |
| s -= len; |
| if (s <= buf) { |
| fprintf(stderr, "fuse: path too long: ...%s\n", s + len); |
| return NULL; |
| } |
| strncpy(s, name, len); |
| s--; |
| *s = '/'; |
| |
| return s; |
| } |
| |
| static char *get_path_name(struct fuse *f, fuse_ino_t nodeid, const char *name) |
| { |
| char buf[FUSE_MAX_PATH]; |
| char *s = buf + FUSE_MAX_PATH - 1; |
| struct node *node; |
| |
| *s = '\0'; |
| |
| if (name != NULL) { |
| s = add_name(buf, s, name); |
| if (s == NULL) |
| return NULL; |
| } |
| |
| pthread_mutex_lock(&f->lock); |
| for (node = get_node(f, nodeid); node && node->nodeid != FUSE_ROOT_ID; |
| node = get_node(f, node->parent)) { |
| if (node->name == NULL) { |
| s = NULL; |
| break; |
| } |
| |
| s = add_name(buf, s, node->name); |
| if (s == NULL) |
| break; |
| } |
| pthread_mutex_unlock(&f->lock); |
| |
| if (node == NULL || s == NULL) |
| return NULL; |
| else if (*s == '\0') |
| return strdup("/"); |
| else |
| return strdup(s); |
| } |
| |
| static char *get_path(struct fuse *f, fuse_ino_t nodeid) |
| { |
| return get_path_name(f, nodeid, NULL); |
| } |
| |
| 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); |
| assert(node->nlookup >= nlookup); |
| node->nlookup -= nlookup; |
| if (!node->nlookup) { |
| unhash_name(f, node); |
| unref_node(f, node); |
| } |
| pthread_mutex_unlock(&f->lock); |
| } |
| |
| 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) |
| unhash_name(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; |
| } |
| unhash_name(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 void set_stat(struct fuse *f, fuse_ino_t nodeid, struct stat *stbuf) |
| { |
| if (!(f->flags & FUSE_USE_INO)) |
| stbuf->st_ino = nodeid; |
| if (f->flags & FUSE_SET_MODE) |
| stbuf->st_mode = (stbuf->st_mode & S_IFMT) | (0777 & ~f->umask); |
| if (f->flags & FUSE_SET_UID) |
| stbuf->st_uid = f->uid; |
| if (f->flags & FUSE_SET_GID) |
| stbuf->st_gid = f->gid; |
| } |
| |
| 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; |
| |
| if (!f->op.getattr) |
| return NULL; |
| |
| 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); |
| pthread_mutex_unlock(&f->lock); |
| |
| newpath = get_path_name(f, dir, newname); |
| if (!newpath) |
| break; |
| |
| res = f->op.getattr(newpath, &buf); |
| if (res != 0) |
| break; |
| free(newpath); |
| newpath = NULL; |
| } while(--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; |
| |
| if (f->op.rename && f->op.unlink) { |
| newpath = hidden_name(f, dir, oldname, newname, sizeof(newname)); |
| if (newpath) { |
| int res = f->op.rename(oldpath, newpath); |
| if (res == 0) |
| err = rename_node(f, dir, oldname, dir, newname, 1); |
| free(newpath); |
| } |
| } |
| return err; |
| } |
| |
| static int lookup_path(struct fuse *f, fuse_ino_t nodeid, const char *name, |
| const char *path, struct fuse_entry_param *e) |
| { |
| int res; |
| |
| memset(e, 0, sizeof(struct fuse_entry_param)); |
| res = f->op.getattr(path, &e->attr); |
| if (res == 0) { |
| struct node *node; |
| |
| node = find_node(f, nodeid, name); |
| if (node == NULL) |
| res = -ENOMEM; |
| else { |
| e->ino = node->nodeid; |
| e->generation = node->generation; |
| e->entry_timeout = f->entry_timeout; |
| e->attr_timeout = f->attr_timeout; |
| set_stat(f, e->ino, &e->attr); |
| if (f->flags & FUSE_DEBUG) { |
| printf(" NODEID: %lu\n", (unsigned long) e->ino); |
| fflush(stdout); |
| } |
| } |
| } |
| return res; |
| } |
| |
| static struct fuse *req_fuse(fuse_req_t req) |
| { |
| return (struct fuse *) fuse_req_userdata(req); |
| } |
| |
| static struct fuse *req_fuse_prepare(fuse_req_t req) |
| { |
| struct fuse_context *c = fuse_get_context(); |
| const struct fuse_ctx *ctx = fuse_req_ctx(req); |
| c->fuse = req_fuse(req); |
| c->uid = ctx->uid; |
| c->gid = ctx->gid; |
| c->pid = ctx->pid; |
| c->private_data = c->fuse->user_data; |
| |
| return c->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) { |
| if (fuse_reply_entry(req, e) == -ENOENT) |
| forget_node(req_fuse(req), e->ino, 1); |
| } else |
| reply_err(req, err); |
| } |
| |
| static void fuse_data_init(void *data) |
| { |
| struct fuse *f = (struct fuse *) data; |
| |
| if (f->op.init) |
| f->user_data = f->op.init(); |
| } |
| |
| static void fuse_data_destroy(void *data) |
| { |
| struct fuse *f = (struct fuse *) data; |
| |
| if (f->op.destroy) |
| f->op.destroy(f->user_data); |
| } |
| |
| static void fuse_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; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("LOOKUP %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.getattr) |
| err = lookup_path(f, parent, name, path, &e); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_entry(req, &e, err); |
| } |
| |
| static void fuse_forget(fuse_req_t req, fuse_ino_t ino, unsigned long nlookup) |
| { |
| struct fuse *f = req_fuse(req); |
| if (f->flags & FUSE_DEBUG) { |
| printf("FORGET %lu/%lu\n", ino, nlookup); |
| fflush(stdout); |
| } |
| forget_node(f, ino, nlookup); |
| fuse_reply_none(req); |
| } |
| |
| static void fuse_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; |
| |
| (void) fi; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.getattr) |
| err = f->op.getattr(path, &buf); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| if (!err) { |
| set_stat(f, ino, &buf); |
| fuse_reply_attr(req, &buf, f->attr_timeout); |
| } else |
| reply_err(req, err); |
| } |
| |
| static int do_chmod(struct fuse *f, const char *path, struct stat *attr) |
| { |
| int err; |
| |
| err = -ENOSYS; |
| if (f->op.chmod) |
| err = f->op.chmod(path, attr->st_mode); |
| |
| return err; |
| } |
| |
| static int do_chown(struct fuse *f, const char *path, struct stat *attr, |
| int valid) |
| { |
| int err; |
| 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 = -ENOSYS; |
| if (f->op.chown) |
| err = f->op.chown(path, uid, gid); |
| |
| return err; |
| } |
| |
| static int do_truncate(struct fuse *f, const char *path, struct stat *attr) |
| { |
| int err; |
| |
| err = -ENOSYS; |
| if (f->op.truncate) |
| err = f->op.truncate(path, attr->st_size); |
| |
| return err; |
| } |
| |
| static int do_utime(struct fuse *f, const char *path, struct stat *attr) |
| { |
| int err; |
| struct utimbuf buf; |
| buf.actime = attr->st_atime; |
| buf.modtime = attr->st_mtime; |
| err = -ENOSYS; |
| if (f->op.utime) |
| err = f->op.utime(path, &buf); |
| |
| return err; |
| } |
| |
| static void fuse_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; |
| |
| (void) fi; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.getattr) { |
| err = 0; |
| if (!err && (valid & FUSE_SET_ATTR_MODE)) |
| err = do_chmod(f, path, attr); |
| if (!err && (valid & (FUSE_SET_ATTR_UID | FUSE_SET_ATTR_GID))) |
| err = do_chown(f, path, attr, valid); |
| if (!err && (valid & FUSE_SET_ATTR_SIZE)) |
| err = do_truncate(f, path, attr); |
| if (!err && (valid & (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME)) == (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME)) |
| err = do_utime(f, path, attr); |
| if (!err) |
| err = f->op.getattr(path, &buf); |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| if (!err) { |
| set_stat(f, ino, &buf); |
| fuse_reply_attr(req, &buf, f->attr_timeout); |
| } else |
| reply_err(req, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.readlink) |
| err = f->op.readlink(path, linkname, sizeof(linkname)); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| if (!err) { |
| linkname[PATH_MAX] = '\0'; |
| fuse_reply_readlink(req, linkname); |
| } else |
| reply_err(req, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("MKNOD %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.mknod && f->op.getattr) { |
| err = f->op.mknod(path, mode, rdev); |
| if (!err) |
| err = lookup_path(f, parent, name, path, &e); |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_entry(req, &e, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("MKDIR %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.mkdir && f->op.getattr) { |
| err = f->op.mkdir(path, mode); |
| if (!err) |
| err = lookup_path(f, parent, name, path, &e); |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_entry(req, &e, err); |
| } |
| |
| static void fuse_unlink(fuse_req_t req, fuse_ino_t parent, const char *name) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path; |
| int err; |
| |
| err = -ENOENT; |
| pthread_rwlock_wrlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("UNLINK %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.unlink) { |
| if (!(f->flags & FUSE_HARD_REMOVE) && is_open(f, parent, name)) |
| err = hide_node(f, path, parent, name); |
| else { |
| err = f->op.unlink(path); |
| if (!err) |
| remove_node(f, parent, name); |
| } |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static void fuse_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path; |
| int err; |
| |
| err = -ENOENT; |
| pthread_rwlock_wrlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("RMDIR %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.rmdir) { |
| err = f->op.rmdir(path); |
| if (!err) |
| remove_node(f, parent, name); |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path_name(f, parent, name); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("SYMLINK %s\n", path); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.symlink && f->op.getattr) { |
| err = f->op.symlink(linkname, path); |
| if (!err) |
| err = lookup_path(f, parent, name, path, &e); |
| } |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_entry(req, &e, err); |
| } |
| |
| static void fuse_rename(fuse_req_t req, fuse_ino_t olddir, const char *oldname, |
| fuse_ino_t newdir, const char *newname) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *oldpath; |
| char *newpath; |
| int err; |
| |
| err = -ENOENT; |
| pthread_rwlock_wrlock(&f->tree_lock); |
| oldpath = get_path_name(f, olddir, oldname); |
| if (oldpath != NULL) { |
| newpath = get_path_name(f, newdir, newname); |
| if (newpath != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("RENAME %s -> %s\n", oldpath, newpath); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.rename) { |
| err = 0; |
| if (!(f->flags & FUSE_HARD_REMOVE) && |
| is_open(f, newdir, newname)) |
| err = hide_node(f, newpath, newdir, newname); |
| if (!err) { |
| err = f->op.rename(oldpath, newpath); |
| if (!err) |
| err = rename_node(f, olddir, oldname, newdir, newname, 0); |
| } |
| } |
| free(newpath); |
| } |
| free(oldpath); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| oldpath = get_path(f, ino); |
| if (oldpath != NULL) { |
| newpath = get_path_name(f, newparent, newname); |
| if (newpath != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("LINK %s\n", newpath); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.link && f->op.getattr) { |
| err = f->op.link(oldpath, newpath); |
| if (!err) |
| err = lookup_path(f, newparent, newname, newpath, &e); |
| } |
| free(newpath); |
| } |
| free(oldpath); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_entry(req, &e, err); |
| } |
| |
| static void fuse_open(fuse_req_t req, fuse_ino_t ino, |
| struct fuse_file_info *fi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path = NULL; |
| int err = 0; |
| |
| pthread_rwlock_rdlock(&f->tree_lock); |
| if (f->op.open) { |
| err = -ENOENT; |
| path = get_path(f, ino); |
| if (path != NULL) { |
| if (!f->compat) |
| err = f->op.open(path, fi); |
| else |
| err = ((struct fuse_operations_compat2 *) &f->op)->open(path, fi->flags); |
| } |
| } |
| if (!err) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("OPEN[%lu] flags: 0x%x\n", fi->fh, fi->flags); |
| fflush(stdout); |
| } |
| |
| if (f->flags & FUSE_DIRECT_IO) |
| fi->direct_io = 1; |
| if (f->flags & FUSE_KERNEL_CACHE) |
| fi->keep_cache = 1; |
| |
| pthread_mutex_lock(&f->lock); |
| if (fuse_reply_open(req, fi) == -ENOENT) { |
| /* The open syscall was interrupted, so it must be cancelled */ |
| if(f->op.release && path != NULL) { |
| if (!f->compat) |
| f->op.release(path, fi); |
| else |
| ((struct fuse_operations_compat2 *) &f->op)->release(path, fi->flags); |
| } |
| } else { |
| struct node *node = get_node(f, ino); |
| node->open_count ++; |
| } |
| pthread_mutex_unlock(&f->lock); |
| } else |
| reply_err(req, err); |
| |
| if (path) |
| free(path); |
| pthread_rwlock_unlock(&f->tree_lock); |
| } |
| |
| static void fuse_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); |
| char *path; |
| char *buf; |
| int res; |
| |
| buf = (char *) malloc(size); |
| if (buf == NULL) { |
| reply_err(req, -ENOMEM); |
| return; |
| } |
| |
| res = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("READ[%lu] %u bytes from %llu\n", fi->fh, size, off); |
| fflush(stdout); |
| } |
| |
| res = -ENOSYS; |
| if (f->op.read) |
| res = f->op.read(path, buf, size, off, fi); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| |
| if (res >= 0) { |
| if (f->flags & FUSE_DEBUG) { |
| printf(" READ[%lu] %u bytes\n", fi->fh, res); |
| fflush(stdout); |
| } |
| fuse_reply_buf(req, buf, res); |
| } else |
| reply_err(req, res); |
| |
| free(buf); |
| } |
| |
| static void fuse_write(fuse_req_t req, fuse_ino_t ino, const char *buf, |
| size_t size, off_t off, struct fuse_file_info *fi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path; |
| int res; |
| |
| res = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("WRITE%s[%lu] %u bytes to %llu\n", |
| fi->writepage ? "PAGE" : "", fi->fh, size, off); |
| fflush(stdout); |
| } |
| |
| res = -ENOSYS; |
| if (f->op.write) |
| res = f->op.write(path, buf, size, off, fi); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| |
| if (res >= 0) |
| fuse_reply_write(req, res); |
| else |
| reply_err(req, res); |
| } |
| |
| static void fuse_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; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("FLUSH[%lu]\n", fi->fh); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.flush) |
| err = f->op.flush(path, fi); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static void fuse_release(fuse_req_t req, fuse_ino_t ino, |
| struct fuse_file_info *fi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path; |
| struct node *node; |
| int unlink_hidden; |
| |
| pthread_mutex_lock(&f->lock); |
| node = get_node(f, ino); |
| assert(node->open_count > 0); |
| --node->open_count; |
| unlink_hidden = (node->is_hidden && !node->open_count); |
| pthread_mutex_unlock(&f->lock); |
| |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (f->flags & FUSE_DEBUG) { |
| printf("RELEASE[%lu] flags: 0x%x\n", fi->fh, fi->flags); |
| fflush(stdout); |
| } |
| if (f->op.release) { |
| if (!f->compat) |
| f->op.release(path ? path : "-", fi); |
| else if (path) |
| ((struct fuse_operations_compat2 *) &f->op)->release(path, fi->flags); |
| } |
| |
| if(unlink_hidden && path) |
| f->op.unlink(path); |
| |
| if (path) |
| free(path); |
| pthread_rwlock_unlock(&f->tree_lock); |
| |
| reply_err(req, 0); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| if (f->flags & FUSE_DEBUG) { |
| printf("FSYNC[%lu]\n", fi->fh); |
| fflush(stdout); |
| } |
| err = -ENOSYS; |
| if (f->op.fsync) |
| err = f->op.fsync(path, datasync, fi); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static struct fuse_dirhandle *get_dirhandle(const struct fuse_file_info *llfi, |
| struct fuse_file_info *fi) |
| { |
| struct fuse_dirhandle *dh = (struct fuse_dirhandle *) llfi->fh; |
| memset(fi, 0, sizeof(struct fuse_file_info)); |
| fi->fh = dh->fh; |
| return dh; |
| } |
| |
| static void fuse_opendir(fuse_req_t req, fuse_ino_t ino, |
| struct fuse_file_info *llfi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| struct fuse_dirhandle *dh; |
| |
| dh = (struct fuse_dirhandle *) malloc(sizeof(struct fuse_dirhandle)); |
| if (dh == NULL) { |
| reply_err(req, -ENOMEM); |
| return; |
| } |
| memset(dh, 0, sizeof(struct fuse_dirhandle)); |
| dh->fuse = f; |
| dh->contents = NULL; |
| dh->len = 0; |
| dh->filled = 0; |
| dh->nodeid = ino; |
| mutex_init(&dh->lock); |
| |
| llfi->fh = (unsigned long) dh; |
| |
| if (f->op.opendir) { |
| struct fuse_file_info fi; |
| char *path; |
| int err; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = llfi->flags; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = f->op.opendir(path, &fi); |
| dh->fh = fi.fh; |
| } |
| if (!err) { |
| pthread_mutex_lock(&f->lock); |
| if (fuse_reply_open(req, llfi) == -ENOENT) { |
| /* The opendir syscall was interrupted, so it must be |
| cancelled */ |
| if(f->op.releasedir) |
| f->op.releasedir(path, &fi); |
| pthread_mutex_destroy(&dh->lock); |
| free(dh); |
| } |
| pthread_mutex_unlock(&f->lock); |
| } else { |
| reply_err(req, err); |
| free(dh); |
| } |
| free(path); |
| pthread_rwlock_unlock(&f->tree_lock); |
| } else |
| fuse_reply_open(req, llfi); |
| } |
| |
| static int fill_dir_common(struct fuse_dirhandle *dh, const char *name, |
| const struct stat *statp, off_t off) |
| { |
| struct stat stbuf; |
| unsigned namelen = strlen(name); |
| unsigned entsize; |
| unsigned newlen; |
| char *newptr; |
| |
| if (statp) |
| stbuf = *statp; |
| else { |
| memset(&stbuf, 0, sizeof(stbuf)); |
| stbuf.st_ino = (ino_t) -1; |
| } |
| |
| if (!(dh->fuse->flags & FUSE_USE_INO)) { |
| stbuf.st_ino = (ino_t) -1; |
| if (dh->fuse->flags & FUSE_READDIR_INO) { |
| struct node *node; |
| pthread_mutex_lock(&dh->fuse->lock); |
| node = lookup_node(dh->fuse, dh->nodeid, name); |
| if (node) |
| stbuf.st_ino = (ino_t) node->nodeid; |
| pthread_mutex_unlock(&dh->fuse->lock); |
| } |
| } |
| |
| entsize = fuse_dirent_size(namelen); |
| newlen = dh->len + entsize; |
| |
| if (off) { |
| dh->filled = 0; |
| if (newlen > dh->needlen) |
| return 1; |
| } |
| |
| newptr = (char *) realloc(dh->contents, newlen); |
| if (!newptr) { |
| dh->error = -ENOMEM; |
| return 1; |
| } |
| dh->contents = newptr; |
| fuse_add_dirent(dh->contents + dh->len, name, &stbuf, off ? off : newlen); |
| dh->len = newlen; |
| return 0; |
| } |
| |
| static int fill_dir(void *buf, const char *name, const struct stat *stbuf, |
| off_t off) |
| { |
| return fill_dir_common((struct fuse_dirhandle *) buf, name, stbuf, off); |
| } |
| |
| static int fill_dir_old(struct fuse_dirhandle *dh, const char *name, int type, |
| ino_t ino) |
| { |
| struct stat stbuf; |
| |
| memset(&stbuf, 0, sizeof(stbuf)); |
| stbuf.st_mode = type << 12; |
| stbuf.st_ino = ino; |
| |
| fill_dir_common(dh, name, &stbuf, 0); |
| return dh->error; |
| } |
| |
| static int readdir_fill(struct fuse *f, fuse_ino_t ino, size_t size, |
| off_t off, struct fuse_dirhandle *dh, |
| struct fuse_file_info *fi) |
| { |
| int err = -ENOENT; |
| char *path; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| dh->len = 0; |
| dh->error = 0; |
| dh->needlen = size; |
| dh->filled = 1; |
| err = -ENOSYS; |
| if (f->op.readdir) |
| err = f->op.readdir(path, dh, fill_dir, off, fi); |
| else if (f->op.getdir) |
| err = f->op.getdir(path, dh, fill_dir_old); |
| if (!err) |
| err = dh->error; |
| if (err) |
| dh->filled = 0; |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| return err; |
| } |
| |
| static void fuse_readdir(fuse_req_t req, fuse_ino_t ino, size_t size, |
| off_t off, struct fuse_file_info *llfi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| struct fuse_file_info fi; |
| struct fuse_dirhandle *dh = get_dirhandle(llfi, &fi); |
| |
| pthread_mutex_lock(&dh->lock); |
| /* According to SUS, directory contents need to be refreshed on |
| rewinddir() */ |
| if (!off) |
| dh->filled = 0; |
| |
| if (!dh->filled) { |
| int err = readdir_fill(f, ino, size, off, dh, &fi); |
| if (err) { |
| reply_err(req, err); |
| goto out; |
| } |
| } |
| if (dh->filled) { |
| if (off < dh->len) { |
| if (off + size > dh->len) |
| size = dh->len - off; |
| } else |
| size = 0; |
| } else { |
| size = dh->len; |
| off = 0; |
| } |
| fuse_reply_buf(req, dh->contents + off, size); |
| out: |
| pthread_mutex_unlock(&dh->lock); |
| } |
| |
| static void fuse_releasedir(fuse_req_t req, fuse_ino_t ino, |
| struct fuse_file_info *llfi) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| struct fuse_file_info fi; |
| struct fuse_dirhandle *dh = get_dirhandle(llfi, &fi); |
| if (f->op.releasedir) { |
| char *path; |
| |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| f->op.releasedir(path ? path : "-", &fi); |
| free(path); |
| pthread_rwlock_unlock(&f->tree_lock); |
| } |
| pthread_mutex_lock(&dh->lock); |
| pthread_mutex_unlock(&dh->lock); |
| pthread_mutex_destroy(&dh->lock); |
| free(dh->contents); |
| free(dh); |
| reply_err(req, 0); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.fsyncdir) |
| err = f->op.fsyncdir(path, datasync, &fi); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static int default_statfs(struct statfs *buf) |
| { |
| buf->f_namelen = 255; |
| buf->f_bsize = 512; |
| return 0; |
| } |
| |
| static void convert_statfs_compat(struct fuse_statfs_compat1 *compatbuf, |
| struct statfs *stbuf) |
| { |
| stbuf->f_bsize = compatbuf->block_size; |
| stbuf->f_blocks = compatbuf->blocks; |
| stbuf->f_bfree = compatbuf->blocks_free; |
| stbuf->f_bavail = compatbuf->blocks_free; |
| stbuf->f_files = compatbuf->files; |
| stbuf->f_ffree = compatbuf->files_free; |
| stbuf->f_namelen = compatbuf->namelen; |
| } |
| |
| static void fuse_statfs(fuse_req_t req) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| struct statfs buf; |
| int err; |
| |
| memset(&buf, 0, sizeof(struct statfs)); |
| if (f->op.statfs) { |
| if (!f->compat || f->compat > 11) |
| err = f->op.statfs("/", &buf); |
| else { |
| struct fuse_statfs_compat1 compatbuf; |
| memset(&compatbuf, 0, sizeof(struct fuse_statfs_compat1)); |
| err = ((struct fuse_operations_compat1 *) &f->op)->statfs(&compatbuf); |
| if (!err) |
| convert_statfs_compat(&compatbuf, &buf); |
| } |
| } |
| else |
| err = default_statfs(&buf); |
| |
| if (!err) |
| fuse_reply_statfs(req, &buf); |
| else |
| reply_err(req, err); |
| } |
| |
| static void fuse_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 = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.setxattr) |
| err = f->op.setxattr(path, name, value, size, flags); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static int common_getxattr(struct fuse *f, fuse_ino_t ino, const char *name, |
| char *value, size_t size) |
| { |
| int err; |
| char *path; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.getxattr) |
| err = f->op.getxattr(path, name, value, size); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| return err; |
| } |
| |
| static void fuse_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, 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, 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_ino_t ino, char *list, |
| size_t size) |
| { |
| char *path; |
| int err; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.listxattr) |
| err = f->op.listxattr(path, list, size); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| return err; |
| } |
| |
| static void fuse_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, ino, list, size); |
| if (res > 0) |
| fuse_reply_buf(req, list, res); |
| else |
| reply_err(req, res); |
| free(list); |
| } else { |
| res = common_listxattr(f, ino, NULL, 0); |
| if (res >= 0) |
| fuse_reply_xattr(req, res); |
| else |
| reply_err(req, res); |
| } |
| } |
| |
| static void fuse_removexattr(fuse_req_t req, fuse_ino_t ino, const char *name) |
| { |
| struct fuse *f = req_fuse_prepare(req); |
| char *path; |
| int err; |
| |
| err = -ENOENT; |
| pthread_rwlock_rdlock(&f->tree_lock); |
| path = get_path(f, ino); |
| if (path != NULL) { |
| err = -ENOSYS; |
| if (f->op.removexattr) |
| err = f->op.removexattr(path, name); |
| free(path); |
| } |
| pthread_rwlock_unlock(&f->tree_lock); |
| reply_err(req, err); |
| } |
| |
| static struct fuse_lowlevel_ops fuse_path_ops = { |
| .init = fuse_data_init, |
| .destroy = fuse_data_destroy, |
| .lookup = fuse_lookup, |
| .forget = fuse_forget, |
| .getattr = fuse_getattr, |
| .setattr = fuse_setattr, |
| .readlink = fuse_readlink, |
| .mknod = fuse_mknod, |
| .mkdir = fuse_mkdir, |
| .unlink = fuse_unlink, |
| .rmdir = fuse_rmdir, |
| .symlink = fuse_symlink, |
| .rename = fuse_rename, |
| .link = fuse_link, |
| .open = fuse_open, |
| .read = fuse_read, |
| .write = fuse_write, |
| .flush = fuse_flush, |
| .release = fuse_release, |
| .fsync = fuse_fsync, |
| .opendir = fuse_opendir, |
| .readdir = fuse_readdir, |
| .releasedir = fuse_releasedir, |
| .fsyncdir = fuse_fsyncdir, |
| .statfs = fuse_statfs, |
| .setxattr = fuse_setxattr, |
| .getxattr = fuse_getxattr, |
| .listxattr = fuse_listxattr, |
| .removexattr = fuse_removexattr, |
| }; |
| |
| static void free_cmd(struct fuse_cmd *cmd) |
| { |
| free(cmd->buf); |
| free(cmd); |
| } |
| |
| void fuse_process_cmd(struct fuse *f, struct fuse_cmd *cmd) |
| { |
| fuse_session_process(f->se, cmd->buf, cmd->buflen, cmd->ch); |
| } |
| |
| int fuse_exited(struct fuse *f) |
| { |
| return fuse_session_exited(f->se); |
| } |
| |
| struct fuse_session *fuse_get_session(struct fuse *f) |
| { |
| return f->se; |
| } |
| |
| static struct fuse_cmd *fuse_alloc_cmd(size_t bufsize) |
| { |
| struct fuse_cmd *cmd = (struct fuse_cmd *) malloc(sizeof(*cmd)); |
| if (cmd == NULL) { |
| fprintf(stderr, "fuse: failed to allocate cmd\n"); |
| return NULL; |
| } |
| cmd->buf = (char *) malloc(bufsize); |
| if (cmd->buf == NULL) { |
| fprintf(stderr, "fuse: failed to allocate read buffer\n"); |
| free(cmd); |
| return NULL; |
| } |
| return cmd; |
| } |
| |
| struct fuse_cmd *fuse_read_cmd(struct fuse *f) |
| { |
| struct fuse_chan *ch = fuse_session_next_chan(f->se, NULL); |
| size_t bufsize = fuse_chan_bufsize(ch); |
| struct fuse_cmd *cmd = fuse_alloc_cmd(bufsize); |
| if (cmd != NULL) { |
| int res = fuse_chan_receive(ch, cmd->buf, bufsize); |
| if (res <= 0) { |
| free_cmd(cmd); |
| return NULL; |
| } |
| cmd->buflen = res; |
| cmd->ch = ch; |
| } |
| return cmd; |
| } |
| |
| int fuse_loop(struct fuse *f) |
| { |
| if (f) |
| return fuse_session_loop(f->se); |
| else |
| return -1; |
| } |
| |
| int fuse_invalidate(struct fuse *f, const char *path) |
| { |
| (void) f; |
| (void) path; |
| return -EINVAL; |
| } |
| |
| void fuse_exit(struct fuse *f) |
| { |
| fuse_session_exit(f->se); |
| } |
| |
| struct fuse_context *fuse_get_context() |
| { |
| static struct fuse_context context; |
| if (fuse_getcontext) |
| return fuse_getcontext(); |
| else |
| return &context; |
| } |
| |
| void fuse_set_getcontext_func(struct fuse_context *(*func)(void)) |
| { |
| fuse_getcontext = func; |
| } |
| |
| static int begins_with(const char *s, const char *beg) |
| { |
| if (strncmp(s, beg, strlen(beg)) == 0) |
| return 1; |
| else |
| return 0; |
| } |
| |
| int fuse_is_lib_option(const char *opt) |
| { |
| if (fuse_lowlevel_is_lib_option(opt) || |
| strcmp(opt, "debug") == 0 || |
| strcmp(opt, "hard_remove") == 0 || |
| strcmp(opt, "use_ino") == 0 || |
| strcmp(opt, "allow_root") == 0 || |
| strcmp(opt, "readdir_ino") == 0 || |
| strcmp(opt, "direct_io") == 0 || |
| strcmp(opt, "kernel_cache") == 0 || |
| begins_with(opt, "umask=") || |
| begins_with(opt, "uid=") || |
| begins_with(opt, "gid=") || |
| begins_with(opt, "entry_timeout=") || |
| begins_with(opt, "attr_timeout=")) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int parse_lib_opts(struct fuse *f, const char *opts, char **llopts) |
| { |
| if (opts) { |
| char *xopts = strdup(opts); |
| char *s = xopts; |
| char *opt; |
| char *d = xopts; |
| |
| if (xopts == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| return -1; |
| } |
| |
| while((opt = strsep(&s, ","))) { |
| if (fuse_lowlevel_is_lib_option(opt)) { |
| size_t optlen = strlen(opt); |
| if (strcmp(opt, "debug") == 0) |
| f->flags |= FUSE_DEBUG; |
| memmove(d, opt, optlen); |
| d += optlen; |
| *d++ = ','; |
| } else if (strcmp(opt, "hard_remove") == 0) |
| f->flags |= FUSE_HARD_REMOVE; |
| else if (strcmp(opt, "use_ino") == 0) |
| f->flags |= FUSE_USE_INO; |
| else if (strcmp(opt, "readdir_ino") == 0) |
| f->flags |= FUSE_READDIR_INO; |
| else if (strcmp(opt, "direct_io") == 0) |
| f->flags |= FUSE_DIRECT_IO; |
| else if (strcmp(opt, "kernel_cache") == 0) |
| f->flags |= FUSE_KERNEL_CACHE; |
| else if (sscanf(opt, "umask=%o", &f->umask) == 1) |
| f->flags |= FUSE_SET_MODE; |
| else if (sscanf(opt, "uid=%u", &f->uid) == 1) |
| f->flags |= FUSE_SET_UID; |
| else if(sscanf(opt, "gid=%u", &f->gid) == 1) |
| f->flags |= FUSE_SET_GID; |
| else if (sscanf(opt, "entry_timeout=%lf", &f->entry_timeout) == 1) |
| /* nop */; |
| else if (sscanf(opt, "attr_timeout=%lf", &f->attr_timeout) == 1) |
| /* nop */; |
| else |
| fprintf(stderr, "fuse: warning: unknown option `%s'\n", opt); |
| } |
| if (d != xopts) { |
| d[-1] = '\0'; |
| *llopts = xopts; |
| } |
| else |
| free(xopts); |
| } |
| return 0; |
| } |
| |
| struct fuse *fuse_new_common(int fd, const char *opts, |
| const struct fuse_operations *op, |
| size_t op_size, int compat) |
| { |
| struct fuse_chan *ch; |
| struct fuse *f; |
| struct node *root; |
| char *llopts = NULL; |
| |
| 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); |
| } |
| |
| f = (struct fuse *) calloc(1, sizeof(struct fuse)); |
| if (f == NULL) { |
| fprintf(stderr, "fuse: failed to allocate fuse object\n"); |
| goto out; |
| } |
| |
| f->entry_timeout = 1.0; |
| f->attr_timeout = 1.0; |
| |
| if (parse_lib_opts(f, opts, &llopts) == -1) |
| goto out_free; |
| |
| f->se = fuse_lowlevel_new(llopts, &fuse_path_ops, sizeof(fuse_path_ops), f); |
| free(llopts); |
| if (f->se == NULL) |
| goto out_free; |
| |
| ch = fuse_kern_chan_new(fd); |
| if (ch == NULL) |
| goto out_free_session; |
| |
| fuse_session_add_chan(f->se, ch); |
| |
| f->ctr = 0; |
| f->generation = 0; |
| /* FIXME: Dynamic hash table */ |
| f->name_table_size = 14057; |
| f->name_table = (struct node **) |
| calloc(1, sizeof(struct node *) * f->name_table_size); |
| if (f->name_table == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| goto out_free_session; |
| } |
| |
| f->id_table_size = 14057; |
| f->id_table = (struct node **) |
| calloc(1, sizeof(struct node *) * f->id_table_size); |
| if (f->id_table == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| goto out_free_name_table; |
| } |
| |
| mutex_init(&f->lock); |
| memcpy(&f->op, op, op_size); |
| f->compat = compat; |
| |
| root = (struct node *) calloc(1, sizeof(struct node)); |
| if (root == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| goto out_free_id_table; |
| } |
| |
| root->name = strdup("/"); |
| if (root->name == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| goto out_free_root; |
| } |
| |
| root->parent = 0; |
| root->nodeid = FUSE_ROOT_ID; |
| root->generation = 0; |
| root->refctr = 1; |
| root->nlookup = 1; |
| hash_id(f, root); |
| |
| return f; |
| |
| out_free_root: |
| free(root); |
| out_free_id_table: |
| free(f->id_table); |
| out_free_name_table: |
| free(f->name_table); |
| out_free_session: |
| fuse_session_destroy(f->se); |
| out_free: |
| free(f); |
| out: |
| return NULL; |
| } |
| |
| struct fuse *fuse_new(int fd, const char *opts, |
| const struct fuse_operations *op, size_t op_size) |
| { |
| return fuse_new_common(fd, opts, op, op_size, 0); |
| } |
| |
| struct fuse *fuse_new_compat2(int fd, const char *opts, |
| const struct fuse_operations_compat2 *op) |
| { |
| return fuse_new_common(fd, opts, (struct fuse_operations *) op, |
| sizeof(struct fuse_operations_compat2), 21); |
| } |
| |
| struct fuse *fuse_new_compat1(int fd, int flags, |
| const struct fuse_operations_compat1 *op) |
| { |
| const char *opts = NULL; |
| if (flags & FUSE_DEBUG_COMPAT1) |
| opts = "debug"; |
| return fuse_new_common(fd, opts, (struct fuse_operations *) op, |
| sizeof(struct fuse_operations_compat1), 11); |
| } |
| |
| void fuse_destroy(struct fuse *f) |
| { |
| size_t i; |
| for (i = 0; i < f->id_table_size; i++) { |
| struct node *node; |
| |
| for (node = f->id_table[i]; node != NULL; node = node->id_next) { |
| if (node->is_hidden) { |
| char *path = get_path(f, node->nodeid); |
| if (path) { |
| f->op.unlink(path); |
| free(path); |
| } |
| } |
| } |
| } |
| for (i = 0; i < f->id_table_size; i++) { |
| struct node *node; |
| struct node *next; |
| |
| for (node = f->id_table[i]; node != NULL; node = next) { |
| next = node->id_next; |
| free_node(node); |
| } |
| } |
| free(f->id_table); |
| free(f->name_table); |
| pthread_mutex_destroy(&f->lock); |
| fuse_session_destroy(f->se); |
| free(f); |
| } |
| |
| __asm__(".symver fuse_exited,__fuse_exited@"); |
| __asm__(".symver fuse_process_cmd,__fuse_process_cmd@"); |
| __asm__(".symver fuse_read_cmd,__fuse_read_cmd@"); |
| __asm__(".symver fuse_set_getcontext_func,__fuse_set_getcontext_func@"); |
| __asm__(".symver fuse_new_compat2,fuse_new@"); |