/*
FUSE: Filesystem in Userspace
- Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
+ Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
#include <linux/slab.h>
#include <linux/kernel.h>
-static struct file_operations fuse_direct_io_file_operations;
+static const struct file_operations fuse_direct_io_file_operations;
static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
struct fuse_open_out *outargp)
struct fuse_req *req;
int err;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
memset(&inarg, 0, sizeof(inarg));
inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
struct fuse_file *ff;
ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
if (ff) {
- ff->release_req = fuse_request_alloc();
- if (!ff->release_req) {
+ ff->reserved_req = fuse_request_alloc();
+ if (!ff->reserved_req) {
kfree(ff);
ff = NULL;
}
void fuse_file_free(struct fuse_file *ff)
{
- fuse_request_free(ff->release_req);
+ fuse_request_free(ff->reserved_req);
kfree(ff);
}
return err;
}
-/* Special case for failed iget in CREATE */
-static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
+struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags,
+ int opcode)
{
- /* If called from end_io_requests(), req has more than one
- reference and fuse_reset_request() cannot work */
- if (fc->connected) {
- u64 nodeid = req->in.h.nodeid;
- fuse_reset_request(req);
- fuse_send_forget(fc, req, nodeid, 1);
- } else
- fuse_put_request(fc, req);
-}
-
-void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff,
- u64 nodeid, struct inode *inode, int flags, int isdir)
-{
- struct fuse_req * req = ff->release_req;
+ struct fuse_req *req = ff->reserved_req;
struct fuse_release_in *inarg = &req->misc.release_in;
inarg->fh = ff->fh;
inarg->flags = flags;
- req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
+ req->in.h.opcode = opcode;
req->in.h.nodeid = nodeid;
- req->inode = inode;
req->in.numargs = 1;
req->in.args[0].size = sizeof(struct fuse_release_in);
req->in.args[0].value = inarg;
- request_send_background(fc, req);
- if (!inode)
- req->end = fuse_release_end;
kfree(ff);
+
+ return req;
}
int fuse_release_common(struct inode *inode, struct file *file, int isdir)
struct fuse_file *ff = file->private_data;
if (ff) {
struct fuse_conn *fc = get_fuse_conn(inode);
- u64 nodeid = get_node_id(inode);
- fuse_send_release(fc, ff, nodeid, inode, file->f_flags, isdir);
+ struct fuse_req *req;
+
+ req = fuse_release_fill(ff, get_node_id(inode), file->f_flags,
+ isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
+
+ /* Hold vfsmount and dentry until release is finished */
+ req->vfsmount = mntget(file->f_path.mnt);
+ req->dentry = dget(file->f_path.dentry);
+ request_send_background(fc, req);
}
/* Return value is ignored by VFS */
return fuse_release_common(inode, file, 0);
}
-static int fuse_flush(struct file *file)
+/*
+ * Scramble the ID space with XTEA, so that the value of the files_struct
+ * pointer is not exposed to userspace.
+ */
+static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
{
- struct inode *inode = file->f_dentry->d_inode;
+ u32 *k = fc->scramble_key;
+ u64 v = (unsigned long) id;
+ u32 v0 = v;
+ u32 v1 = v >> 32;
+ u32 sum = 0;
+ int i;
+
+ for (i = 0; i < 32; i++) {
+ v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
+ sum += 0x9E3779B9;
+ v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
+ }
+
+ return (u64) v0 + ((u64) v1 << 32);
+}
+
+static int fuse_flush(struct file *file, fl_owner_t id)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
struct fuse_req *req;
if (fc->no_flush)
return 0;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
-
+ req = fuse_get_req_nofail(fc, file);
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
+ inarg.lock_owner = fuse_lock_owner_id(fc, id);
req->in.h.opcode = FUSE_FLUSH;
req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->file = file;
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
+ req->force = 1;
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
return 0;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
inarg.fsync_flags = datasync ? 1 : 0;
req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->file = file;
req->in.numargs = 1;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].value = &inarg;
inarg->size = count;
req->in.h.opcode = opcode;
req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->file = file;
req->in.numargs = 1;
req->in.args[0].size = sizeof(struct fuse_read_in);
req->in.args[0].value = inarg;
if (is_bad_inode(inode))
goto out;
- err = -EINTR;
- req = fuse_get_request(fc);
- if (!req)
+ req = fuse_get_req(fc);
+ err = PTR_ERR(req);
+ if (IS_ERR(req))
goto out;
req->out.page_zeroing = 1;
req->out.page_zeroing = 1;
fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
if (fc->async_read) {
+ get_file(file);
+ req->file = file;
req->end = fuse_readpages_end;
request_send_background(fc, req);
} else {
(req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
req->pages[req->num_pages - 1]->index + 1 != page->index)) {
fuse_send_readpages(req, data->file, inode);
- data->req = req = fuse_get_request(fc);
- if (!req) {
+ data->req = req = fuse_get_req(fc);
+ if (IS_ERR(req)) {
unlock_page(page);
- return -EINTR;
+ return PTR_ERR(req);
}
}
req->pages[req->num_pages] = page;
struct fuse_readpages_data data;
int err;
+ err = -EIO;
if (is_bad_inode(inode))
- return -EIO;
+ goto out;
data.file = file;
data.inode = inode;
- data.req = fuse_get_request(fc);
- if (!data.req)
- return -EINTR;
+ data.req = fuse_get_req(fc);
+ err = PTR_ERR(data.req);
+ if (IS_ERR(data.req))
+ goto out;
err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
if (!err) {
else
fuse_put_request(fc, data.req);
}
+out:
return err;
}
inarg.size = count;
req->in.h.opcode = FUSE_WRITE;
req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->file = file;
req->in.argpages = 1;
req->in.numargs = 2;
req->in.args[0].size = sizeof(struct fuse_write_in);
if (is_bad_inode(inode))
return -EIO;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
req->num_pages = 1;
req->pages[0] = page;
err = -EIO;
if (!err) {
pos += count;
- spin_lock(&fuse_lock);
+ spin_lock(&fc->lock);
if (pos > inode->i_size)
i_size_write(inode, pos);
- spin_unlock(&fuse_lock);
+ spin_unlock(&fc->lock);
- if (offset == 0 && to == PAGE_CACHE_SIZE) {
- clear_page_dirty(page);
+ if (offset == 0 && to == PAGE_CACHE_SIZE)
SetPageUptodate(page);
- }
}
fuse_invalidate_attr(inode);
return err;
static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
size_t count, loff_t *ppos, int write)
{
- struct inode *inode = file->f_dentry->d_inode;
+ struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
size_t nmax = write ? fc->max_write : fc->max_read;
loff_t pos = *ppos;
if (is_bad_inode(inode))
return -EIO;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
while (count) {
size_t nres;
buf += nres;
if (nres != nbytes)
break;
- if (count)
- fuse_reset_request(req);
+ if (count) {
+ fuse_put_request(fc, req);
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ break;
+ }
}
fuse_put_request(fc, req);
if (res > 0) {
if (write) {
- spin_lock(&fuse_lock);
+ spin_lock(&fc->lock);
if (pos > inode->i_size)
i_size_write(inode, pos);
- spin_unlock(&fuse_lock);
+ spin_unlock(&fc->lock);
}
*ppos = pos;
}
static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct inode *inode = file->f_dentry->d_inode;
+ struct inode *inode = file->f_path.dentry->d_inode;
ssize_t res;
/* Don't allow parallel writes to the same file */
mutex_lock(&inode->i_mutex);
return 0;
}
-static struct file_operations fuse_file_operations = {
+static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
+ struct file_lock *fl)
+{
+ switch (ffl->type) {
+ case F_UNLCK:
+ break;
+
+ case F_RDLCK:
+ case F_WRLCK:
+ if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
+ ffl->end < ffl->start)
+ return -EIO;
+
+ fl->fl_start = ffl->start;
+ fl->fl_end = ffl->end;
+ fl->fl_pid = ffl->pid;
+ break;
+
+ default:
+ return -EIO;
+ }
+ fl->fl_type = ffl->type;
+ return 0;
+}
+
+static void fuse_lk_fill(struct fuse_req *req, struct file *file,
+ const struct file_lock *fl, int opcode, pid_t pid)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_file *ff = file->private_data;
+ struct fuse_lk_in *arg = &req->misc.lk_in;
+
+ arg->fh = ff->fh;
+ arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
+ arg->lk.start = fl->fl_start;
+ arg->lk.end = fl->fl_end;
+ arg->lk.type = fl->fl_type;
+ arg->lk.pid = pid;
+ req->in.h.opcode = opcode;
+ req->in.h.nodeid = get_node_id(inode);
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(*arg);
+ req->in.args[0].value = arg;
+}
+
+static int fuse_getlk(struct file *file, struct file_lock *fl)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_lk_out outarg;
+ int err;
+
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (!err)
+ err = convert_fuse_file_lock(&outarg.lk, fl);
+
+ return err;
+}
+
+static int fuse_setlk(struct file *file, struct file_lock *fl)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
+ pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
+ int err;
+
+ /* Unlock on close is handled by the flush method */
+ if (fl->fl_flags & FL_CLOSE)
+ return 0;
+
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ fuse_lk_fill(req, file, fl, opcode, pid);
+ request_send(fc, req);
+ err = req->out.h.error;
+ /* locking is restartable */
+ if (err == -EINTR)
+ err = -ERESTARTSYS;
+ fuse_put_request(fc, req);
+ return err;
+}
+
+static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ int err;
+
+ if (cmd == F_GETLK) {
+ if (fc->no_lock) {
+ if (!posix_test_lock(file, fl, fl))
+ fl->fl_type = F_UNLCK;
+ err = 0;
+ } else
+ err = fuse_getlk(file, fl);
+ } else {
+ if (fc->no_lock)
+ err = posix_lock_file_wait(file, fl);
+ else
+ err = fuse_setlk(file, fl);
+ }
+ return err;
+}
+
+static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
+{
+ struct inode *inode = mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_bmap_in inarg;
+ struct fuse_bmap_out outarg;
+ int err;
+
+ if (!inode->i_sb->s_bdev || fc->no_bmap)
+ return 0;
+
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return 0;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.block = block;
+ inarg.blocksize = inode->i_sb->s_blocksize;
+ req->in.h.opcode = FUSE_BMAP;
+ req->in.h.nodeid = get_node_id(inode);
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS)
+ fc->no_bmap = 1;
+
+ return err ? 0 : outarg.block;
+}
+
+static const struct file_operations fuse_file_operations = {
.llseek = generic_file_llseek,
- .read = generic_file_read,
- .write = generic_file_write,
+ .read = do_sync_read,
+ .aio_read = generic_file_aio_read,
+ .write = do_sync_write,
+ .aio_write = generic_file_aio_write,
.mmap = fuse_file_mmap,
.open = fuse_open,
.flush = fuse_flush,
.release = fuse_release,
.fsync = fuse_fsync,
+ .lock = fuse_file_lock,
.sendfile = generic_file_sendfile,
};
-static struct file_operations fuse_direct_io_file_operations = {
+static const struct file_operations fuse_direct_io_file_operations = {
.llseek = generic_file_llseek,
.read = fuse_direct_read,
.write = fuse_direct_write,
.flush = fuse_flush,
.release = fuse_release,
.fsync = fuse_fsync,
+ .lock = fuse_file_lock,
/* no mmap and sendfile */
};
-static struct address_space_operations fuse_file_aops = {
+static const struct address_space_operations fuse_file_aops = {
.readpage = fuse_readpage,
.prepare_write = fuse_prepare_write,
.commit_write = fuse_commit_write,
.readpages = fuse_readpages,
.set_page_dirty = fuse_set_page_dirty,
+ .bmap = fuse_bmap,
};
void fuse_init_file_inode(struct inode *inode)
git://git.onelab.eu / linux-2.6.git / blobdiff