* [PATCH 4/11] FUSE - read-only operations
@ 2005-01-10 19:02 Miklos Szeredi
2005-01-10 22:18 ` Mike Waychison
0 siblings, 1 reply; 4+ messages in thread
From: Miklos Szeredi @ 2005-01-10 19:02 UTC (permalink / raw)
To: akpm, torvalds; +Cc: linux-fsdevel, linux-kernel
This patch adds the read-only filesystem operations of FUSE.
This contains the following files:
o dir.c
- directory, symlink and file-inode operations
The following operations are added:
o lookup
o getattr
o readlink
o follow_link
o directory open
o readdir
o directory release
o permission
o dentry revalidate
o statfs
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
diff -Nurp a/fs/fuse/Makefile b/fs/fuse/Makefile
--- a/fs/fuse/Makefile 2005-01-10 19:28:38.000000000 +0100
+++ b/fs/fuse/Makefile 2005-01-10 19:28:38.000000000 +0100
@@ -4,4 +4,4 @@
obj-$(CONFIG_FUSE) += fuse.o
-fuse-objs := dev.o inode.o
+fuse-objs := dev.o dir.o inode.o
diff -Nurp a/fs/fuse/dev.c b/fs/fuse/dev.c
--- a/fs/fuse/dev.c 2005-01-10 19:28:38.000000000 +0100
+++ b/fs/fuse/dev.c 2005-01-10 19:28:38.000000000 +0100
@@ -642,6 +642,13 @@ static struct fuse_req *request_find(str
return NULL;
}
+/* fget() needs to be done in this context */
+static void process_getdir(struct fuse_req *req)
+{
+ struct fuse_getdir_out_i *arg = req->out.args[0].value;
+ arg->file = fget(arg->fd);
+}
+
static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
unsigned nbytes)
{
@@ -714,6 +721,8 @@ static ssize_t fuse_dev_writev(struct fi
if (!err) {
if (req->interrupted)
err = -ENOENT;
+ else if (req->in.h.opcode == FUSE_GETDIR && !oh.error)
+ process_getdir(req);
} else if (!req->interrupted)
req->out.h.error = -EIO;
request_end(fc, req);
diff -Nurp a/fs/fuse/dir.c b/fs/fuse/dir.c
--- a/fs/fuse/dir.c 1970-01-01 01:00:00.000000000 +0100
+++ b/fs/fuse/dir.c 2005-01-10 19:28:38.000000000 +0100
@@ -0,0 +1,417 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
+
+ This program can be distributed under the terms of the GNU GPL.
+ See the file COPYING.
+*/
+
+#include "fuse_i.h"
+
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/gfp.h>
+#include <linux/sched.h>
+
+static inline unsigned long time_to_jiffies(unsigned long sec,
+ unsigned long nsec)
+{
+ /* prevent wrapping of jiffies */
+ if (sec + 1 >= LONG_MAX / HZ)
+ return 0;
+
+ return jiffies + sec * HZ + nsec / (1000000000 / HZ);
+}
+
+static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
+ struct dentry *entry,
+ struct fuse_entry_out *outarg)
+{
+ req->in.h.opcode = FUSE_LOOKUP;
+ req->in.h.nodeid = get_node_id(dir);
+ req->inode = dir;
+ req->in.numargs = 1;
+ req->in.args[0].size = entry->d_name.len + 1;
+ req->in.args[0].value = entry->d_name.name;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(struct fuse_entry_out);
+ req->out.args[0].value = outarg;
+}
+
+static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
+{
+ if (!entry->d_inode || is_bad_inode(entry->d_inode))
+ return 0;
+ else if (entry->d_time && time_after(jiffies, entry->d_time)) {
+ int err;
+ int version;
+ struct fuse_entry_out outarg;
+ struct inode *inode = entry->d_inode;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request_nonint(fc);
+ if (!req)
+ return 0;
+
+ fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
+ request_send_nonint(fc, req);
+ version = req->out.h.unique;
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err || outarg.nodeid != get_node_id(inode) ||
+ (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
+ return 0;
+
+ fuse_change_attributes(inode, &outarg.attr);
+ inode->i_version = version;
+ entry->d_time = time_to_jiffies(outarg.entry_valid,
+ outarg.entry_valid_nsec);
+ fi->i_time = time_to_jiffies(outarg.attr_valid,
+ outarg.attr_valid_nsec);
+ }
+ return 1;
+}
+
+static struct dentry_operations fuse_dentry_operations = {
+ .d_revalidate = fuse_dentry_revalidate,
+};
+
+static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
+ struct inode **inodep)
+{
+ int err;
+ int version;
+ struct fuse_entry_out outarg;
+ struct inode *inode = NULL;
+ struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_req *req;
+
+ if (entry->d_name.len > FUSE_NAME_MAX)
+ return -ENAMETOOLONG;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ fuse_lookup_init(req, dir, entry, &outarg);
+ request_send(fc, req);
+ version = req->out.h.unique;
+ err = req->out.h.error;
+ if (!err) {
+ inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
+ &outarg.attr, version);
+ if (!inode) {
+ fuse_send_forget(fc, req, outarg.nodeid, version);
+ return -ENOMEM;
+ }
+ }
+ fuse_put_request(fc, req);
+ if (err && err != -ENOENT)
+ return err;
+
+ if (inode) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ entry->d_time = time_to_jiffies(outarg.entry_valid,
+ outarg.entry_valid_nsec);
+ fi->i_time = time_to_jiffies(outarg.attr_valid,
+ outarg.attr_valid_nsec);
+ }
+
+ entry->d_op = &fuse_dentry_operations;
+ *inodep = inode;
+ return 0;
+}
+
+int fuse_do_getattr(struct inode *inode)
+{
+ int err;
+ struct fuse_attr_out arg;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ req->in.h.opcode = FUSE_GETATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(arg);
+ req->out.args[0].value = &arg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (!err) {
+ if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
+ make_bad_inode(inode);
+ err = -EIO;
+ } else {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ fuse_change_attributes(inode, &arg.attr);
+ fi->i_time = time_to_jiffies(arg.attr_valid,
+ arg.attr_valid_nsec);
+ }
+ }
+ return err;
+}
+
+static int fuse_revalidate(struct dentry *entry)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (get_node_id(inode) == FUSE_ROOT_ID) {
+ if (current->fsuid != fc->user_id)
+ return -EACCES;
+ } else if (!fi->i_time || time_before_eq(jiffies, fi->i_time))
+ return 0;
+
+ return fuse_do_getattr(inode);
+}
+
+static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (current->fsuid != fc->user_id)
+ return -EACCES;
+ else {
+ int mode = inode->i_mode;
+ if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
+ (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+ return -EROFS;
+ if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
+ return -EACCES;
+ return 0;
+ }
+}
+
+static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
+ void *dstbuf, filldir_t filldir)
+{
+ while (nbytes >= FUSE_NAME_OFFSET) {
+ struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
+ size_t reclen = FUSE_DIRENT_SIZE(dirent);
+ int over;
+ if (dirent->namelen > FUSE_NAME_MAX)
+ return -EIO;
+ if (reclen > nbytes)
+ break;
+
+ over = filldir(dstbuf, dirent->name, dirent->namelen,
+ file->f_pos, dirent->ino, dirent->type);
+ if (over)
+ break;
+
+ buf += reclen;
+ file->f_pos += reclen;
+ nbytes -= reclen;
+ }
+
+ return 0;
+}
+
+static int fuse_checkdir(struct file *cfile, struct file *file)
+{
+ struct inode *inode;
+ if (!cfile)
+ return -EIO;
+ inode = cfile->f_dentry->d_inode;
+ if (!S_ISREG(inode->i_mode)) {
+ fput(cfile);
+ return -EIO;
+ }
+
+ file->private_data = cfile;
+ return 0;
+}
+
+static int fuse_getdir(struct file *file)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ struct fuse_getdir_out_i outarg;
+ int err;
+
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ req->in.h.opcode = FUSE_GETDIR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(struct fuse_getdir_out);
+ req->out.args[0].value = &outarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (!err)
+ err = fuse_checkdir(outarg.file, file);
+ return err;
+}
+
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
+{
+ struct file *cfile = file->private_data;
+ char *buf;
+ int ret;
+
+ if (!cfile) {
+ ret = fuse_getdir(file);
+ if (ret)
+ return ret;
+
+ cfile = file->private_data;
+ }
+
+ buf = (char *) __get_free_page(GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
+ if (ret > 0)
+ ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
+
+ free_page((unsigned long) buf);
+ return ret;
+}
+
+static char *read_link(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ char *link;
+
+ if (!req)
+ return ERR_PTR(-ERESTARTNOINTR);
+
+ link = (char *) __get_free_page(GFP_KERNEL);
+ if (!link) {
+ link = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ req->in.h.opcode = FUSE_READLINK;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.argvar = 1;
+ req->out.numargs = 1;
+ req->out.args[0].size = PAGE_SIZE - 1;
+ req->out.args[0].value = link;
+ request_send(fc, req);
+ if (req->out.h.error) {
+ free_page((unsigned long) link);
+ link = ERR_PTR(req->out.h.error);
+ } else
+ link[req->out.args[0].size] = '\0';
+ out:
+ fuse_put_request(fc, req);
+ return link;
+}
+
+static void free_link(char *link)
+{
+ if (!IS_ERR(link))
+ free_page((unsigned long) link);
+}
+
+static int fuse_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ int ret;
+ char *link;
+
+ link = read_link(dentry);
+ ret = vfs_readlink(dentry, buffer, buflen, link);
+ free_link(link);
+ return ret;
+}
+
+static int fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ int ret;
+ char *link;
+
+ link = read_link(dentry);
+ ret = vfs_follow_link(nd, link);
+ free_link(link);
+ return ret;
+}
+
+static int fuse_dir_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return 0;
+}
+
+static int fuse_dir_release(struct inode *inode, struct file *file)
+{
+ struct file *cfile = file->private_data;
+
+ if (cfile)
+ fput(cfile);
+
+ return 0;
+}
+
+static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
+ struct kstat *stat)
+{
+ struct inode *inode = entry->d_inode;
+ int err = fuse_revalidate(entry);
+ if (!err)
+ generic_fillattr(inode, stat);
+
+ return err;
+}
+
+static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
+ struct nameidata *nd)
+{
+ struct inode *inode;
+ int err = fuse_lookup_iget(dir, entry, &inode);
+ if (err)
+ return ERR_PTR(err);
+ return d_splice_alias(inode, entry);
+}
+
+static struct inode_operations fuse_dir_inode_operations = {
+ .lookup = fuse_lookup,
+ .permission = fuse_permission,
+ .getattr = fuse_getattr,
+};
+
+static struct file_operations fuse_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = fuse_readdir,
+ .open = fuse_dir_open,
+ .release = fuse_dir_release,
+};
+
+static struct inode_operations fuse_common_inode_operations = {
+ .permission = fuse_permission,
+ .getattr = fuse_getattr,
+};
+
+static struct inode_operations fuse_symlink_inode_operations = {
+ .readlink = fuse_readlink,
+ .follow_link = fuse_follow_link,
+ .getattr = fuse_getattr,
+};
+
+void fuse_init_common(struct inode *inode)
+{
+ inode->i_op = &fuse_common_inode_operations;
+}
+
+void fuse_init_dir(struct inode *inode)
+{
+ inode->i_op = &fuse_dir_inode_operations;
+ inode->i_fop = &fuse_dir_operations;
+}
+
+void fuse_init_symlink(struct inode *inode)
+{
+ inode->i_op = &fuse_symlink_inode_operations;
+}
diff -Nurp a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
--- a/fs/fuse/fuse_i.h 2005-01-10 19:28:38.000000000 +0100
+++ b/fs/fuse/fuse_i.h 2005-01-10 19:28:38.000000000 +0100
@@ -27,6 +27,9 @@ struct fuse_inode {
* and kernel */
u64 nodeid;
+ /** The request used for sending the FORGET message */
+ struct fuse_req *forget_req;
+
/** Time in jiffies until the file attributes are valid */
unsigned long i_time;
};
@@ -126,6 +129,7 @@ struct fuse_req {
/** Data for asynchronous requests */
union {
+ struct fuse_forget_in forget_in;
struct fuse_init_in_out init_in_out;
} misc;
@@ -191,6 +195,11 @@ struct fuse_conn {
struct backing_dev_info bdi;
};
+struct fuse_getdir_out_i {
+ int fd;
+ void *file; /* Used by kernel only */
+};
+
static inline struct fuse_conn **get_fuse_conn_super_p(struct super_block *sb)
{
return (struct fuse_conn **) &sb->s_fs_info;
@@ -234,6 +243,38 @@ extern struct file_operations fuse_dev_o
extern spinlock_t fuse_lock;
/**
+ * Get a filled in inode
+ */
+struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
+ int generation, struct fuse_attr *attr, int version);
+
+/**
+ * Send FORGET command
+ */
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+ unsigned long nodeid, int version);
+
+/**
+ * Initialise inode operations on regular files and special files
+ */
+void fuse_init_common(struct inode *inode);
+
+/**
+ * Initialise inode and file operations on a directory
+ */
+void fuse_init_dir(struct inode *inode);
+
+/**
+ * Initialise inode operations on a symlink
+ */
+void fuse_init_symlink(struct inode *inode);
+
+/**
+ * Change attributes of an inode
+ */
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);
+
+/**
* Check if the connection can be released, and if yes, then free the
* connection structure
*/
@@ -301,6 +342,16 @@ void request_send_noreply(struct fuse_co
void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
/**
+ * Get the attributes of a file
+ */
+int fuse_do_getattr(struct inode *inode);
+
+/**
+ * Invalidate inode attributes
+ */
+void fuse_invalidate_attr(struct inode *inode);
+
+/**
* Send the INIT message
*/
void fuse_send_init(struct fuse_conn *fc);
diff -Nurp a/fs/fuse/inode.c b/fs/fuse/inode.c
--- a/fs/fuse/inode.c 2005-01-10 19:28:38.000000000 +0100
+++ b/fs/fuse/inode.c 2005-01-10 19:28:38.000000000 +0100
@@ -50,12 +50,20 @@ static struct inode *fuse_alloc_inode(st
fi = get_fuse_inode(inode);
memset(fi, 0, sizeof(*fi));
+ fi->forget_req = fuse_request_alloc();
+ if (!fi->forget_req) {
+ kmem_cache_free(fuse_inode_cachep, inode);
+ return NULL;
+ }
return inode;
}
static void fuse_destroy_inode(struct inode *inode)
{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ if (fi->forget_req)
+ fuse_request_free(fi->forget_req);
kmem_cache_free(fuse_inode_cachep, inode);
}
@@ -64,8 +72,27 @@ static void fuse_read_inode(struct inode
/* No op */
}
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+ unsigned long nodeid, int version)
+{
+ struct fuse_forget_in *inarg = &req->misc.forget_in;
+ inarg->version = version;
+ req->in.h.opcode = FUSE_FORGET;
+ req->in.h.nodeid = nodeid;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(struct fuse_forget_in);
+ req->in.args[0].value = inarg;
+ request_send_noreply(fc, req);
+}
+
static void fuse_clear_inode(struct inode *inode)
{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ if (fc) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ fuse_send_forget(fc, fi->forget_req, fi->nodeid, inode->i_version);
+ fi->forget_req = NULL;
+ }
}
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
@@ -93,6 +120,22 @@ static void fuse_init_inode(struct inode
{
inode->i_mode = attr->mode & S_IFMT;
i_size_write(inode, attr->size);
+ if (S_ISREG(inode->i_mode)) {
+ fuse_init_common(inode);
+ } else if (S_ISDIR(inode->i_mode))
+ fuse_init_dir(inode);
+ else if (S_ISLNK(inode->i_mode))
+ fuse_init_symlink(inode);
+ else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+ S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+ fuse_init_common(inode);
+ init_special_inode(inode, inode->i_mode,
+ new_decode_dev(attr->rdev));
+ } else {
+ /* Don't let user create weird files */
+ inode->i_mode = S_IFREG;
+ fuse_init_common(inode);
+ }
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
@@ -157,6 +200,43 @@ static void fuse_put_super(struct super_
spin_unlock(&fuse_lock);
}
+static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
+{
+ stbuf->f_type = FUSE_SUPER_MAGIC;
+ stbuf->f_bsize = attr->bsize;
+ stbuf->f_blocks = attr->blocks;
+ stbuf->f_bfree = attr->bfree;
+ stbuf->f_bavail = attr->bavail;
+ stbuf->f_files = attr->files;
+ stbuf->f_ffree = attr->ffree;
+ stbuf->f_namelen = attr->namelen;
+ /* fsid is left zero */
+}
+
+static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_req *req;
+ struct fuse_statfs_out outarg;
+ int err;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTSYS;
+
+ req->in.numargs = 0;
+ req->in.h.opcode = FUSE_STATFS;
+ 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;
+ if (!err)
+ convert_fuse_statfs(buf, &outarg.st);
+ fuse_put_request(fc, req);
+ return err;
+}
+
enum {
OPT_FD,
OPT_ROOTMODE,
@@ -317,6 +397,7 @@ static struct super_operations fuse_supe
.read_inode = fuse_read_inode,
.clear_inode = fuse_clear_inode,
.put_super = fuse_put_super,
+ .statfs = fuse_statfs,
.show_options = fuse_show_options,
};
diff -Nurp a/include/linux/fuse.h b/include/linux/fuse.h
--- a/include/linux/fuse.h 2005-01-10 19:28:38.000000000 +0100
+++ b/include/linux/fuse.h 2005-01-10 19:28:38.000000000 +0100
@@ -42,13 +42,61 @@ struct fuse_attr {
__u32 rdev;
};
+struct fuse_kstatfs {
+ __u64 blocks;
+ __u64 bfree;
+ __u64 bavail;
+ __u64 files;
+ __u64 ffree;
+ __u32 bsize;
+ __u32 namelen;
+};
+
enum fuse_opcode {
+ FUSE_LOOKUP = 1,
+ FUSE_FORGET = 2, /* no reply */
+ FUSE_GETATTR = 3,
+ FUSE_READLINK = 5,
+ FUSE_GETDIR = 7,
+ FUSE_STATFS = 17,
FUSE_INIT = 26
};
/* Conservative buffer size for the client */
#define FUSE_MAX_IN 8192
+#define FUSE_NAME_MAX 1024
+
+struct fuse_entry_out {
+ __u64 nodeid; /* Inode ID */
+ __u64 generation; /* Inode generation: nodeid:gen must
+ be unique for the fs's lifetime */
+ __u64 entry_valid; /* Cache timeout for the name */
+ __u64 attr_valid; /* Cache timeout for the attributes */
+ __u32 entry_valid_nsec;
+ __u32 attr_valid_nsec;
+ struct fuse_attr attr;
+};
+
+struct fuse_forget_in {
+ __u64 version;
+};
+
+struct fuse_attr_out {
+ __u64 attr_valid; /* Cache timeout for the attributes */
+ __u32 attr_valid_nsec;
+ __u32 dummy;
+ struct fuse_attr attr;
+};
+
+struct fuse_getdir_out {
+ __u32 fd;
+};
+
+struct fuse_statfs_out {
+ struct fuse_kstatfs st;
+};
+
struct fuse_init_in_out {
__u32 major;
__u32 minor;
@@ -70,3 +118,14 @@ struct fuse_out_header {
__u64 unique;
};
+struct fuse_dirent {
+ __u64 ino;
+ __u32 namelen;
+ __u32 type;
+ char name[0];
+};
+
+#define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
+#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
+#define FUSE_DIRENT_SIZE(d) \
+ FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH 4/11] FUSE - read-only operations
2005-01-10 19:02 [PATCH 4/11] FUSE - read-only operations Miklos Szeredi
@ 2005-01-10 22:18 ` Mike Waychison
2005-01-10 23:03 ` Miklos Szeredi
0 siblings, 1 reply; 4+ messages in thread
From: Mike Waychison @ 2005-01-10 22:18 UTC (permalink / raw)
To: Miklos Szeredi; +Cc: akpm, torvalds, linux-fsdevel, linux-kernel
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Miklos Szeredi wrote:
> This patch adds the read-only filesystem operations of FUSE.
>
> This contains the following files:
>
> o dir.c
> - directory, symlink and file-inode operations
>
> The following operations are added:
>
> o lookup
> o getattr
> o readlink
> o follow_link
> o directory open
> o readdir
> o directory release
> o permission
> o dentry revalidate
> o statfs
>
> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
> diff -Nurp a/fs/fuse/Makefile b/fs/fuse/Makefile
> --- a/fs/fuse/Makefile 2005-01-10 19:28:38.000000000 +0100
> +++ b/fs/fuse/Makefile 2005-01-10 19:28:38.000000000 +0100
> @@ -4,4 +4,4 @@
>
> obj-$(CONFIG_FUSE) += fuse.o
>
> -fuse-objs := dev.o inode.o
> +fuse-objs := dev.o dir.o inode.o
> diff -Nurp a/fs/fuse/dev.c b/fs/fuse/dev.c
> --- a/fs/fuse/dev.c 2005-01-10 19:28:38.000000000 +0100
> +++ b/fs/fuse/dev.c 2005-01-10 19:28:38.000000000 +0100
> @@ -642,6 +642,13 @@ static struct fuse_req *request_find(str
> return NULL;
> }
>
> +/* fget() needs to be done in this context */
> +static void process_getdir(struct fuse_req *req)
> +{
> + struct fuse_getdir_out_i *arg = req->out.args[0].value;
> + arg->file = fget(arg->fd);
> +}
> +
> static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
> unsigned nbytes)
> {
> @@ -714,6 +721,8 @@ static ssize_t fuse_dev_writev(struct fi
> if (!err) {
> if (req->interrupted)
> err = -ENOENT;
> + else if (req->in.h.opcode == FUSE_GETDIR && !oh.error)
> + process_getdir(req);
> } else if (!req->interrupted)
> req->out.h.error = -EIO;
> request_end(fc, req);
> diff -Nurp a/fs/fuse/dir.c b/fs/fuse/dir.c
> --- a/fs/fuse/dir.c 1970-01-01 01:00:00.000000000 +0100
> +++ b/fs/fuse/dir.c 2005-01-10 19:28:38.000000000 +0100
> @@ -0,0 +1,417 @@
> +/*
> + FUSE: Filesystem in Userspace
> + Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
> +
> + This program can be distributed under the terms of the GNU GPL.
> + See the file COPYING.
> +*/
> +
> +#include "fuse_i.h"
> +
> +#include <linux/pagemap.h>
> +#include <linux/file.h>
> +#include <linux/gfp.h>
> +#include <linux/sched.h>
> +
> +static inline unsigned long time_to_jiffies(unsigned long sec,
> + unsigned long nsec)
> +{
> + /* prevent wrapping of jiffies */
> + if (sec + 1 >= LONG_MAX / HZ)
> + return 0;
> +
> + return jiffies + sec * HZ + nsec / (1000000000 / HZ);
> +}
Use timespec_to_jiffies ?
> +
> +static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
> + struct dentry *entry,
> + struct fuse_entry_out *outarg)
> +{
> + req->in.h.opcode = FUSE_LOOKUP;
> + req->in.h.nodeid = get_node_id(dir);
> + req->inode = dir;
> + req->in.numargs = 1;
> + req->in.args[0].size = entry->d_name.len + 1;
> + req->in.args[0].value = entry->d_name.name;
> + req->out.numargs = 1;
> + req->out.args[0].size = sizeof(struct fuse_entry_out);
> + req->out.args[0].value = outarg;
> +}
> +
> +static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
> +{
> + if (!entry->d_inode || is_bad_inode(entry->d_inode))
> + return 0;
> + else if (entry->d_time && time_after(jiffies, entry->d_time)) {
> + int err;
> + int version;
> + struct fuse_entry_out outarg;
> + struct inode *inode = entry->d_inode;
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + struct fuse_conn *fc = get_fuse_conn(inode);
> + struct fuse_req *req = fuse_get_request_nonint(fc);
> + if (!req)
> + return 0;
> +
> + fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
> + request_send_nonint(fc, req);
> + version = req->out.h.unique;
> + err = req->out.h.error;
> + fuse_put_request(fc, req);
> + if (err || outarg.nodeid != get_node_id(inode) ||
> + (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
> + return 0;
> +
> + fuse_change_attributes(inode, &outarg.attr);
> + inode->i_version = version;
> + entry->d_time = time_to_jiffies(outarg.entry_valid,
> + outarg.entry_valid_nsec);
> + fi->i_time = time_to_jiffies(outarg.attr_valid,
> + outarg.attr_valid_nsec);
> + }
> + return 1;
> +}
> +
> +static struct dentry_operations fuse_dentry_operations = {
> + .d_revalidate = fuse_dentry_revalidate,
> +};
> +
> +static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
> + struct inode **inodep)
> +{
> + int err;
> + int version;
> + struct fuse_entry_out outarg;
> + struct inode *inode = NULL;
> + struct fuse_conn *fc = get_fuse_conn(dir);
> + struct fuse_req *req;
> +
> + if (entry->d_name.len > FUSE_NAME_MAX)
> + return -ENAMETOOLONG;
> +
> + req = fuse_get_request(fc);
> + if (!req)
> + return -ERESTARTNOINTR;
Is this trying to restart the action over and over if the system is low
on memory?
> +
> + fuse_lookup_init(req, dir, entry, &outarg);
> + request_send(fc, req);
> + version = req->out.h.unique;
> + err = req->out.h.error;
> + if (!err) {
> + inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
> + &outarg.attr, version);
> + if (!inode) {
> + fuse_send_forget(fc, req, outarg.nodeid, version);
> + return -ENOMEM;
> + }
> + }
> + fuse_put_request(fc, req);
> + if (err && err != -ENOENT)
> + return err;
> +
> + if (inode) {
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + entry->d_time = time_to_jiffies(outarg.entry_valid,
> + outarg.entry_valid_nsec);
> + fi->i_time = time_to_jiffies(outarg.attr_valid,
> + outarg.attr_valid_nsec);
> + }
> +
> + entry->d_op = &fuse_dentry_operations;
> + *inodep = inode;
> + return 0;
> +}
> +
> +int fuse_do_getattr(struct inode *inode)
> +{
> + int err;
> + struct fuse_attr_out arg;
> + struct fuse_conn *fc = get_fuse_conn(inode);
> + struct fuse_req *req = fuse_get_request(fc);
> + if (!req)
> + return -ERESTARTNOINTR;
> +
> + req->in.h.opcode = FUSE_GETATTR;
> + req->in.h.nodeid = get_node_id(inode);
> + req->inode = inode;
> + req->out.numargs = 1;
> + req->out.args[0].size = sizeof(arg);
> + req->out.args[0].value = &arg;
> + request_send(fc, req);
> + err = req->out.h.error;
> + fuse_put_request(fc, req);
> + if (!err) {
> + if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
> + make_bad_inode(inode);
> + err = -EIO;
> + } else {
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + fuse_change_attributes(inode, &arg.attr);
> + fi->i_time = time_to_jiffies(arg.attr_valid,
> + arg.attr_valid_nsec);
> + }
> + }
> + return err;
> +}
> +
> +static int fuse_revalidate(struct dentry *entry)
> +{
> + struct inode *inode = entry->d_inode;
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + struct fuse_conn *fc = get_fuse_conn(inode);
> +
> + if (get_node_id(inode) == FUSE_ROOT_ID) {
> + if (current->fsuid != fc->user_id)
> + return -EACCES;
> + } else if (!fi->i_time || time_before_eq(jiffies, fi->i_time))
> + return 0;
> +
> + return fuse_do_getattr(inode);
> +}
> +
> +static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
> +{
> + struct fuse_conn *fc = get_fuse_conn(inode);
> +
> + if (current->fsuid != fc->user_id)
> + return -EACCES;
> + else {
> + int mode = inode->i_mode;
> + if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
> + (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
> + return -EROFS;
> + if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
> + return -EACCES;
> + return 0;
> + }
This else clause would be better to use vfs_permission().
> +}
> +
> +static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
> + void *dstbuf, filldir_t filldir)
> +{
> + while (nbytes >= FUSE_NAME_OFFSET) {
> + struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
> + size_t reclen = FUSE_DIRENT_SIZE(dirent);
> + int over;
> + if (dirent->namelen > FUSE_NAME_MAX)
> + return -EIO;
> + if (reclen > nbytes)
> + break;
> +
> + over = filldir(dstbuf, dirent->name, dirent->namelen,
> + file->f_pos, dirent->ino, dirent->type);
> + if (over)
> + break;
> +
> + buf += reclen;
> + file->f_pos += reclen;
> + nbytes -= reclen;
> + }
> +
> + return 0;
> +}
> +
> +static int fuse_checkdir(struct file *cfile, struct file *file)
> +{
> + struct inode *inode;
> + if (!cfile)
> + return -EIO;
> + inode = cfile->f_dentry->d_inode;
> + if (!S_ISREG(inode->i_mode)) {
> + fput(cfile);
> + return -EIO;
> + }
> +
> + file->private_data = cfile;
> + return 0;
> +}
> +
> +static int fuse_getdir(struct file *file)
> +{
> + struct inode *inode = file->f_dentry->d_inode;
> + struct fuse_conn *fc = get_fuse_conn(inode);
> + struct fuse_req *req = fuse_get_request(fc);
> + struct fuse_getdir_out_i outarg;
> + int err;
> +
> + if (!req)
> + return -ERESTARTNOINTR;
> +
> + req->in.h.opcode = FUSE_GETDIR;
> + req->in.h.nodeid = get_node_id(inode);
> + req->inode = inode;
> + req->out.numargs = 1;
> + req->out.args[0].size = sizeof(struct fuse_getdir_out);
> + req->out.args[0].value = &outarg;
> + request_send(fc, req);
> + err = req->out.h.error;
> + fuse_put_request(fc, req);
> + if (!err)
> + err = fuse_checkdir(outarg.file, file);
> + return err;
> +}
> +
> +static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
> +{
> + struct file *cfile = file->private_data;
> + char *buf;
> + int ret;
> +
> + if (!cfile) {
> + ret = fuse_getdir(file);
> + if (ret)
> + return ret;
> +
> + cfile = file->private_data;
> + }
> +
> + buf = (char *) __get_free_page(GFP_KERNEL);
> + if (!buf)
> + return -ENOMEM;
> +
> + ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
> + if (ret > 0)
> + ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
> +
> + free_page((unsigned long) buf);
> + return ret;
> +}
> +
> +static char *read_link(struct dentry *dentry)
> +{
> + struct inode *inode = dentry->d_inode;
> + struct fuse_conn *fc = get_fuse_conn(inode);
> + struct fuse_req *req = fuse_get_request(fc);
> + char *link;
> +
> + if (!req)
> + return ERR_PTR(-ERESTARTNOINTR);
> +
> + link = (char *) __get_free_page(GFP_KERNEL);
> + if (!link) {
> + link = ERR_PTR(-ENOMEM);
> + goto out;
> + }
> + req->in.h.opcode = FUSE_READLINK;
> + req->in.h.nodeid = get_node_id(inode);
> + req->inode = inode;
> + req->out.argvar = 1;
> + req->out.numargs = 1;
> + req->out.args[0].size = PAGE_SIZE - 1;
> + req->out.args[0].value = link;
> + request_send(fc, req);
> + if (req->out.h.error) {
> + free_page((unsigned long) link);
> + link = ERR_PTR(req->out.h.error);
> + } else
> + link[req->out.args[0].size] = '\0';
> + out:
> + fuse_put_request(fc, req);
> + return link;
> +}
> +
> +static void free_link(char *link)
> +{
> + if (!IS_ERR(link))
> + free_page((unsigned long) link);
> +}
> +
> +static int fuse_readlink(struct dentry *dentry, char __user *buffer,
> + int buflen)
> +{
> + int ret;
> + char *link;
> +
> + link = read_link(dentry);
> + ret = vfs_readlink(dentry, buffer, buflen, link);
> + free_link(link);
> + return ret;
> +}
> +
> +static int fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
> +{
> + int ret;
> + char *link;
> +
> + link = read_link(dentry);
> + ret = vfs_follow_link(nd, link);
> + free_link(link);
> + return ret;
> +}
If you don't have to do magic for follow_link, please use the recently
added interface that is stack friendly. See:
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.7-rc1/2.6.7-rc1-mm1/broken-out/SL0-core-RC6-bk5.patch
> +
> +static int fuse_dir_open(struct inode *inode, struct file *file)
> +{
> + file->private_data = NULL;
> + return 0;
> +}
> +
> +static int fuse_dir_release(struct inode *inode, struct file *file)
> +{
> + struct file *cfile = file->private_data;
> +
> + if (cfile)
> + fput(cfile);
> +
> + return 0;
> +}
> +
> +static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
> + struct kstat *stat)
> +{
> + struct inode *inode = entry->d_inode;
> + int err = fuse_revalidate(entry);
> + if (!err)
> + generic_fillattr(inode, stat);
> +
> + return err;
> +}
> +
> +static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
> + struct nameidata *nd)
> +{
> + struct inode *inode;
> + int err = fuse_lookup_iget(dir, entry, &inode);
> + if (err)
> + return ERR_PTR(err);
> + return d_splice_alias(inode, entry);
> +}
> +
> +static struct inode_operations fuse_dir_inode_operations = {
> + .lookup = fuse_lookup,
> + .permission = fuse_permission,
> + .getattr = fuse_getattr,
> +};
> +
> +static struct file_operations fuse_dir_operations = {
> + .read = generic_read_dir,
> + .readdir = fuse_readdir,
> + .open = fuse_dir_open,
> + .release = fuse_dir_release,
> +};
> +
> +static struct inode_operations fuse_common_inode_operations = {
> + .permission = fuse_permission,
> + .getattr = fuse_getattr,
> +};
> +
> +static struct inode_operations fuse_symlink_inode_operations = {
> + .readlink = fuse_readlink,
> + .follow_link = fuse_follow_link,
> + .getattr = fuse_getattr,
> +};
> +
> +void fuse_init_common(struct inode *inode)
> +{
> + inode->i_op = &fuse_common_inode_operations;
> +}
> +
> +void fuse_init_dir(struct inode *inode)
> +{
> + inode->i_op = &fuse_dir_inode_operations;
> + inode->i_fop = &fuse_dir_operations;
> +}
> +
> +void fuse_init_symlink(struct inode *inode)
> +{
> + inode->i_op = &fuse_symlink_inode_operations;
> +}
> diff -Nurp a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> --- a/fs/fuse/fuse_i.h 2005-01-10 19:28:38.000000000 +0100
> +++ b/fs/fuse/fuse_i.h 2005-01-10 19:28:38.000000000 +0100
> @@ -27,6 +27,9 @@ struct fuse_inode {
> * and kernel */
> u64 nodeid;
>
> + /** The request used for sending the FORGET message */
> + struct fuse_req *forget_req;
> +
> /** Time in jiffies until the file attributes are valid */
> unsigned long i_time;
> };
> @@ -126,6 +129,7 @@ struct fuse_req {
>
> /** Data for asynchronous requests */
> union {
> + struct fuse_forget_in forget_in;
> struct fuse_init_in_out init_in_out;
> } misc;
>
> @@ -191,6 +195,11 @@ struct fuse_conn {
> struct backing_dev_info bdi;
> };
>
> +struct fuse_getdir_out_i {
> + int fd;
> + void *file; /* Used by kernel only */
> +};
> +
> static inline struct fuse_conn **get_fuse_conn_super_p(struct super_block *sb)
> {
> return (struct fuse_conn **) &sb->s_fs_info;
> @@ -234,6 +243,38 @@ extern struct file_operations fuse_dev_o
> extern spinlock_t fuse_lock;
>
> /**
> + * Get a filled in inode
> + */
> +struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
> + int generation, struct fuse_attr *attr, int version);
> +
> +/**
> + * Send FORGET command
> + */
> +void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
> + unsigned long nodeid, int version);
> +
> +/**
> + * Initialise inode operations on regular files and special files
> + */
> +void fuse_init_common(struct inode *inode);
> +
> +/**
> + * Initialise inode and file operations on a directory
> + */
> +void fuse_init_dir(struct inode *inode);
> +
> +/**
> + * Initialise inode operations on a symlink
> + */
> +void fuse_init_symlink(struct inode *inode);
> +
> +/**
> + * Change attributes of an inode
> + */
> +void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);
> +
> +/**
> * Check if the connection can be released, and if yes, then free the
> * connection structure
> */
> @@ -301,6 +342,16 @@ void request_send_noreply(struct fuse_co
> void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
>
> /**
> + * Get the attributes of a file
> + */
> +int fuse_do_getattr(struct inode *inode);
> +
> +/**
> + * Invalidate inode attributes
> + */
> +void fuse_invalidate_attr(struct inode *inode);
> +
> +/**
> * Send the INIT message
> */
> void fuse_send_init(struct fuse_conn *fc);
> diff -Nurp a/fs/fuse/inode.c b/fs/fuse/inode.c
> --- a/fs/fuse/inode.c 2005-01-10 19:28:38.000000000 +0100
> +++ b/fs/fuse/inode.c 2005-01-10 19:28:38.000000000 +0100
> @@ -50,12 +50,20 @@ static struct inode *fuse_alloc_inode(st
>
> fi = get_fuse_inode(inode);
> memset(fi, 0, sizeof(*fi));
> + fi->forget_req = fuse_request_alloc();
> + if (!fi->forget_req) {
> + kmem_cache_free(fuse_inode_cachep, inode);
> + return NULL;
> + }
>
> return inode;
> }
>
> static void fuse_destroy_inode(struct inode *inode)
> {
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + if (fi->forget_req)
> + fuse_request_free(fi->forget_req);
> kmem_cache_free(fuse_inode_cachep, inode);
> }
>
> @@ -64,8 +72,27 @@ static void fuse_read_inode(struct inode
> /* No op */
> }
>
> +void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
> + unsigned long nodeid, int version)
> +{
> + struct fuse_forget_in *inarg = &req->misc.forget_in;
> + inarg->version = version;
> + req->in.h.opcode = FUSE_FORGET;
> + req->in.h.nodeid = nodeid;
> + req->in.numargs = 1;
> + req->in.args[0].size = sizeof(struct fuse_forget_in);
> + req->in.args[0].value = inarg;
> + request_send_noreply(fc, req);
> +}
> +
> static void fuse_clear_inode(struct inode *inode)
> {
> + struct fuse_conn *fc = get_fuse_conn(inode);
> + if (fc) {
> + struct fuse_inode *fi = get_fuse_inode(inode);
> + fuse_send_forget(fc, fi->forget_req, fi->nodeid, inode->i_version);
> + fi->forget_req = NULL;
> + }
> }
>
> void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
> @@ -93,6 +120,22 @@ static void fuse_init_inode(struct inode
> {
> inode->i_mode = attr->mode & S_IFMT;
> i_size_write(inode, attr->size);
> + if (S_ISREG(inode->i_mode)) {
> + fuse_init_common(inode);
> + } else if (S_ISDIR(inode->i_mode))
> + fuse_init_dir(inode);
> + else if (S_ISLNK(inode->i_mode))
> + fuse_init_symlink(inode);
> + else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
> + S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
> + fuse_init_common(inode);
> + init_special_inode(inode, inode->i_mode,
> + new_decode_dev(attr->rdev));
> + } else {
> + /* Don't let user create weird files */
> + inode->i_mode = S_IFREG;
> + fuse_init_common(inode);
> + }
> }
>
> static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
> @@ -157,6 +200,43 @@ static void fuse_put_super(struct super_
> spin_unlock(&fuse_lock);
> }
>
> +static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
> +{
> + stbuf->f_type = FUSE_SUPER_MAGIC;
> + stbuf->f_bsize = attr->bsize;
> + stbuf->f_blocks = attr->blocks;
> + stbuf->f_bfree = attr->bfree;
> + stbuf->f_bavail = attr->bavail;
> + stbuf->f_files = attr->files;
> + stbuf->f_ffree = attr->ffree;
> + stbuf->f_namelen = attr->namelen;
> + /* fsid is left zero */
> +}
> +
> +static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
> +{
> + struct fuse_conn *fc = get_fuse_conn_super(sb);
> + struct fuse_req *req;
> + struct fuse_statfs_out outarg;
> + int err;
> +
> + req = fuse_get_request(fc);
> + if (!req)
> + return -ERESTARTSYS;
> +
> + req->in.numargs = 0;
> + req->in.h.opcode = FUSE_STATFS;
> + 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;
> + if (!err)
> + convert_fuse_statfs(buf, &outarg.st);
> + fuse_put_request(fc, req);
> + return err;
> +}
> +
> enum {
> OPT_FD,
> OPT_ROOTMODE,
> @@ -317,6 +397,7 @@ static struct super_operations fuse_supe
> .read_inode = fuse_read_inode,
> .clear_inode = fuse_clear_inode,
> .put_super = fuse_put_super,
> + .statfs = fuse_statfs,
> .show_options = fuse_show_options,
> };
>
> diff -Nurp a/include/linux/fuse.h b/include/linux/fuse.h
> --- a/include/linux/fuse.h 2005-01-10 19:28:38.000000000 +0100
> +++ b/include/linux/fuse.h 2005-01-10 19:28:38.000000000 +0100
> @@ -42,13 +42,61 @@ struct fuse_attr {
> __u32 rdev;
> };
>
> +struct fuse_kstatfs {
> + __u64 blocks;
> + __u64 bfree;
> + __u64 bavail;
> + __u64 files;
> + __u64 ffree;
> + __u32 bsize;
> + __u32 namelen;
> +};
> +
> enum fuse_opcode {
> + FUSE_LOOKUP = 1,
> + FUSE_FORGET = 2, /* no reply */
> + FUSE_GETATTR = 3,
> + FUSE_READLINK = 5,
> + FUSE_GETDIR = 7,
> + FUSE_STATFS = 17,
> FUSE_INIT = 26
> };
>
> /* Conservative buffer size for the client */
> #define FUSE_MAX_IN 8192
>
> +#define FUSE_NAME_MAX 1024
> +
> +struct fuse_entry_out {
> + __u64 nodeid; /* Inode ID */
> + __u64 generation; /* Inode generation: nodeid:gen must
> + be unique for the fs's lifetime */
> + __u64 entry_valid; /* Cache timeout for the name */
> + __u64 attr_valid; /* Cache timeout for the attributes */
> + __u32 entry_valid_nsec;
> + __u32 attr_valid_nsec;
> + struct fuse_attr attr;
> +};
> +
> +struct fuse_forget_in {
> + __u64 version;
> +};
> +
> +struct fuse_attr_out {
> + __u64 attr_valid; /* Cache timeout for the attributes */
> + __u32 attr_valid_nsec;
> + __u32 dummy;
> + struct fuse_attr attr;
> +};
> +
> +struct fuse_getdir_out {
> + __u32 fd;
> +};
> +
> +struct fuse_statfs_out {
> + struct fuse_kstatfs st;
> +};
> +
> struct fuse_init_in_out {
> __u32 major;
> __u32 minor;
> @@ -70,3 +118,14 @@ struct fuse_out_header {
> __u64 unique;
> };
>
> +struct fuse_dirent {
> + __u64 ino;
> + __u32 namelen;
> + __u32 type;
> + char name[0];
> +};
> +
> +#define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
> +#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
> +#define FUSE_DIRENT_SIZE(d) \
> + FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
> -
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
- --
Mike Waychison
Sun Microsystems, Inc.
1 (650) 352-5299 voice
1 (416) 202-8336 voice
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NOTICE: The opinions expressed in this email are held by me,
and may not represent the views of Sun Microsystems, Inc.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH 4/11] FUSE - read-only operations
2005-01-10 22:18 ` Mike Waychison
@ 2005-01-10 23:03 ` Miklos Szeredi
0 siblings, 0 replies; 4+ messages in thread
From: Miklos Szeredi @ 2005-01-10 23:03 UTC (permalink / raw)
To: Michael.Waychison; +Cc: miklos, akpm, torvalds, linux-fsdevel, linux-kernel
> > +static inline unsigned long time_to_jiffies(unsigned long sec,
> > + unsigned long nsec)
> > +{
> > + /* prevent wrapping of jiffies */
> > + if (sec + 1 >= LONG_MAX / HZ)
> > + return 0;
> > +
> > + return jiffies + sec * HZ + nsec / (1000000000 / HZ);
> > +}
>
> Use timespec_to_jiffies ?
OK.
> > +
> > + req = fuse_get_request(fc);
> > + if (!req)
> > + return -ERESTARTNOINTR;
>
> Is this trying to restart the action over and over if the system is low
> on memory?
No, memory is not allocated in fuse_get_request(). Rather it returns
an unused preallocated request. If there are no unused requests it
will block. If interrupted it will return NULL.
> This else clause would be better to use vfs_permission().
Later patch will introduce mount option that does exactly this. The
default behavior is deliberately more liberal than
generic_permission().
> > + link = read_link(dentry);
> > + ret = vfs_follow_link(nd, link);
> > + free_link(link);
> > + return ret;
> > +}
>
> If you don't have to do magic for follow_link, please use the recently
> added interface that is stack friendly. See:
> http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.7-rc1/2.6.7-rc1-mm1/broken-out/SL0-core-RC6-bk5.patch
OK. I didn't know this.
Thanks,
Miklos
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 4/11] FUSE - read-only operations
@ 2005-01-11 16:26 Miklos Szeredi
0 siblings, 0 replies; 4+ messages in thread
From: Miklos Szeredi @ 2005-01-11 16:26 UTC (permalink / raw)
To: akpm, torvalds; +Cc: linux-fsdevel, linux-kernel
This patch adds the read-only filesystem operations of FUSE.
This contains the following files:
o dir.c
- directory, symlink and file-inode operations
The following operations are added:
o lookup
o getattr
o readlink
o follow_link
o directory open
o readdir
o directory release
o permission
o dentry revalidate
o statfs
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
diff -Nurp a/fs/fuse/Makefile b/fs/fuse/Makefile
--- a/fs/fuse/Makefile 2005-01-11 16:28:29.000000000 +0100
+++ b/fs/fuse/Makefile 2005-01-11 16:28:29.000000000 +0100
@@ -4,4 +4,4 @@
obj-$(CONFIG_FUSE_FS) += fuse.o
-fuse-objs := dev.o inode.o
+fuse-objs := dev.o dir.o inode.o
diff -Nurp a/fs/fuse/dev.c b/fs/fuse/dev.c
--- a/fs/fuse/dev.c 2005-01-11 16:28:29.000000000 +0100
+++ b/fs/fuse/dev.c 2005-01-11 16:28:29.000000000 +0100
@@ -642,6 +642,13 @@ static struct fuse_req *request_find(str
return NULL;
}
+/* fget() needs to be done in this context */
+static void process_getdir(struct fuse_req *req)
+{
+ struct fuse_getdir_out_i *arg = req->out.args[0].value;
+ arg->file = fget(arg->fd);
+}
+
static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
unsigned nbytes)
{
@@ -714,6 +721,8 @@ static ssize_t fuse_dev_writev(struct fi
if (!err) {
if (req->interrupted)
err = -ENOENT;
+ else if (req->in.h.opcode == FUSE_GETDIR && !oh.error)
+ process_getdir(req);
} else if (!req->interrupted)
req->out.h.error = -EIO;
request_end(fc, req);
diff -Nurp a/fs/fuse/dir.c b/fs/fuse/dir.c
--- a/fs/fuse/dir.c 1970-01-01 01:00:00.000000000 +0100
+++ b/fs/fuse/dir.c 2005-01-11 16:28:29.000000000 +0100
@@ -0,0 +1,404 @@
+/*
+ FUSE: Filesystem in Userspace
+ Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
+
+ This program can be distributed under the terms of the GNU GPL.
+ See the file COPYING.
+*/
+
+#include "fuse_i.h"
+
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/gfp.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+
+static inline unsigned long time_to_jiffies(unsigned long sec,
+ unsigned long nsec)
+{
+ struct timespec ts = {sec, nsec};
+ return jiffies + timespec_to_jiffies(&ts);
+}
+
+static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
+ struct dentry *entry,
+ struct fuse_entry_out *outarg)
+{
+ req->in.h.opcode = FUSE_LOOKUP;
+ req->in.h.nodeid = get_node_id(dir);
+ req->inode = dir;
+ req->in.numargs = 1;
+ req->in.args[0].size = entry->d_name.len + 1;
+ req->in.args[0].value = entry->d_name.name;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(struct fuse_entry_out);
+ req->out.args[0].value = outarg;
+}
+
+static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
+{
+ if (!entry->d_inode || is_bad_inode(entry->d_inode))
+ return 0;
+ else if (time_after(jiffies, entry->d_time)) {
+ int err;
+ int version;
+ struct fuse_entry_out outarg;
+ struct inode *inode = entry->d_inode;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request_nonint(fc);
+ if (!req)
+ return 0;
+
+ fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
+ request_send_nonint(fc, req);
+ version = req->out.h.unique;
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err || outarg.nodeid != get_node_id(inode) ||
+ (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
+ return 0;
+
+ fuse_change_attributes(inode, &outarg.attr);
+ inode->i_version = version;
+ entry->d_time = time_to_jiffies(outarg.entry_valid,
+ outarg.entry_valid_nsec);
+ fi->i_time = time_to_jiffies(outarg.attr_valid,
+ outarg.attr_valid_nsec);
+ }
+ return 1;
+}
+
+static struct dentry_operations fuse_dentry_operations = {
+ .d_revalidate = fuse_dentry_revalidate,
+};
+
+static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
+ struct inode **inodep)
+{
+ int err;
+ int version;
+ struct fuse_entry_out outarg;
+ struct inode *inode = NULL;
+ struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_req *req;
+
+ if (entry->d_name.len > FUSE_NAME_MAX)
+ return -ENAMETOOLONG;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ fuse_lookup_init(req, dir, entry, &outarg);
+ request_send(fc, req);
+ version = req->out.h.unique;
+ err = req->out.h.error;
+ if (!err) {
+ inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
+ &outarg.attr, version);
+ if (!inode) {
+ fuse_send_forget(fc, req, outarg.nodeid, version);
+ return -ENOMEM;
+ }
+ }
+ fuse_put_request(fc, req);
+ if (err && err != -ENOENT)
+ return err;
+
+ if (inode) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ entry->d_time = time_to_jiffies(outarg.entry_valid,
+ outarg.entry_valid_nsec);
+ fi->i_time = time_to_jiffies(outarg.attr_valid,
+ outarg.attr_valid_nsec);
+ }
+
+ entry->d_op = &fuse_dentry_operations;
+ *inodep = inode;
+ return 0;
+}
+
+int fuse_do_getattr(struct inode *inode)
+{
+ int err;
+ struct fuse_attr_out arg;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ req->in.h.opcode = FUSE_GETATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(arg);
+ req->out.args[0].value = &arg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (!err) {
+ if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
+ make_bad_inode(inode);
+ err = -EIO;
+ } else {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ fuse_change_attributes(inode, &arg.attr);
+ fi->i_time = time_to_jiffies(arg.attr_valid,
+ arg.attr_valid_nsec);
+ }
+ }
+ return err;
+}
+
+static int fuse_revalidate(struct dentry *entry)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (get_node_id(inode) == FUSE_ROOT_ID) {
+ if (current->fsuid != fc->user_id)
+ return -EACCES;
+ } else if (time_before_eq(jiffies, fi->i_time))
+ return 0;
+
+ return fuse_do_getattr(inode);
+}
+
+static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (current->fsuid != fc->user_id)
+ return -EACCES;
+ else {
+ int mode = inode->i_mode;
+ if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
+ (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+ return -EROFS;
+ if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
+ return -EACCES;
+ return 0;
+ }
+}
+
+static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
+ void *dstbuf, filldir_t filldir)
+{
+ while (nbytes >= FUSE_NAME_OFFSET) {
+ struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
+ size_t reclen = FUSE_DIRENT_SIZE(dirent);
+ int over;
+ if (dirent->namelen > FUSE_NAME_MAX)
+ return -EIO;
+ if (reclen > nbytes)
+ break;
+
+ over = filldir(dstbuf, dirent->name, dirent->namelen,
+ file->f_pos, dirent->ino, dirent->type);
+ if (over)
+ break;
+
+ buf += reclen;
+ file->f_pos += reclen;
+ nbytes -= reclen;
+ }
+
+ return 0;
+}
+
+static int fuse_checkdir(struct file *cfile, struct file *file)
+{
+ struct inode *inode;
+ if (!cfile)
+ return -EIO;
+ inode = cfile->f_dentry->d_inode;
+ if (!S_ISREG(inode->i_mode)) {
+ fput(cfile);
+ return -EIO;
+ }
+
+ file->private_data = cfile;
+ return 0;
+}
+
+static int fuse_getdir(struct file *file)
+{
+ struct inode *inode = file->f_dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ struct fuse_getdir_out_i outarg;
+ int err;
+
+ if (!req)
+ return -ERESTARTNOINTR;
+
+ req->in.h.opcode = FUSE_GETDIR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(struct fuse_getdir_out);
+ req->out.args[0].value = &outarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (!err)
+ err = fuse_checkdir(outarg.file, file);
+ return err;
+}
+
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
+{
+ struct file *cfile = file->private_data;
+ char *buf;
+ int ret;
+
+ if (!cfile) {
+ ret = fuse_getdir(file);
+ if (ret)
+ return ret;
+
+ cfile = file->private_data;
+ }
+
+ buf = (char *) __get_free_page(GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
+ if (ret > 0)
+ ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
+
+ free_page((unsigned long) buf);
+ return ret;
+}
+
+static char *read_link(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req = fuse_get_request(fc);
+ char *link;
+
+ if (!req)
+ return ERR_PTR(-ERESTARTNOINTR);
+
+ link = (char *) __get_free_page(GFP_KERNEL);
+ if (!link) {
+ link = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ req->in.h.opcode = FUSE_READLINK;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->out.argvar = 1;
+ req->out.numargs = 1;
+ req->out.args[0].size = PAGE_SIZE - 1;
+ req->out.args[0].value = link;
+ request_send(fc, req);
+ if (req->out.h.error) {
+ free_page((unsigned long) link);
+ link = ERR_PTR(req->out.h.error);
+ } else
+ link[req->out.args[0].size] = '\0';
+ out:
+ fuse_put_request(fc, req);
+ return link;
+}
+
+static void free_link(char *link)
+{
+ if (!IS_ERR(link))
+ free_page((unsigned long) link);
+}
+
+static int fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ nd_set_link(nd, read_link(dentry));
+ return 0;
+}
+
+static void fuse_put_link(struct dentry *dentry, struct nameidata *nd)
+{
+ free_link(nd_get_link(nd));
+}
+
+static int fuse_dir_open(struct inode *inode, struct file *file)
+{
+ file->private_data = NULL;
+ return 0;
+}
+
+static int fuse_dir_release(struct inode *inode, struct file *file)
+{
+ struct file *cfile = file->private_data;
+
+ if (cfile)
+ fput(cfile);
+
+ return 0;
+}
+
+static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
+ struct kstat *stat)
+{
+ struct inode *inode = entry->d_inode;
+ int err = fuse_revalidate(entry);
+ if (!err)
+ generic_fillattr(inode, stat);
+
+ return err;
+}
+
+static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
+ struct nameidata *nd)
+{
+ struct inode *inode;
+ int err = fuse_lookup_iget(dir, entry, &inode);
+ if (err)
+ return ERR_PTR(err);
+ return d_splice_alias(inode, entry);
+}
+
+static struct inode_operations fuse_dir_inode_operations = {
+ .lookup = fuse_lookup,
+ .permission = fuse_permission,
+ .getattr = fuse_getattr,
+};
+
+static struct file_operations fuse_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = fuse_readdir,
+ .open = fuse_dir_open,
+ .release = fuse_dir_release,
+};
+
+static struct inode_operations fuse_common_inode_operations = {
+ .permission = fuse_permission,
+ .getattr = fuse_getattr,
+};
+
+static struct inode_operations fuse_symlink_inode_operations = {
+ .follow_link = fuse_follow_link,
+ .put_link = fuse_put_link,
+ .readlink = generic_readlink,
+ .getattr = fuse_getattr,
+};
+
+void fuse_init_common(struct inode *inode)
+{
+ inode->i_op = &fuse_common_inode_operations;
+}
+
+void fuse_init_dir(struct inode *inode)
+{
+ inode->i_op = &fuse_dir_inode_operations;
+ inode->i_fop = &fuse_dir_operations;
+}
+
+void fuse_init_symlink(struct inode *inode)
+{
+ inode->i_op = &fuse_symlink_inode_operations;
+}
diff -Nurp a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
--- a/fs/fuse/fuse_i.h 2005-01-11 16:28:29.000000000 +0100
+++ b/fs/fuse/fuse_i.h 2005-01-11 16:28:29.000000000 +0100
@@ -30,6 +30,9 @@ struct fuse_inode {
* and kernel */
u64 nodeid;
+ /** The request used for sending the FORGET message */
+ struct fuse_req *forget_req;
+
/** Time in jiffies until the file attributes are valid */
unsigned long i_time;
};
@@ -129,6 +132,7 @@ struct fuse_req {
/** Data for asynchronous requests */
union {
+ struct fuse_forget_in forget_in;
struct fuse_init_in_out init_in_out;
} misc;
@@ -194,6 +198,11 @@ struct fuse_conn {
struct backing_dev_info bdi;
};
+struct fuse_getdir_out_i {
+ int fd;
+ void *file; /* Used by kernel only */
+};
+
static inline struct fuse_conn **get_fuse_conn_super_p(struct super_block *sb)
{
return (struct fuse_conn **) &sb->s_fs_info;
@@ -237,6 +246,38 @@ extern struct file_operations fuse_dev_o
extern spinlock_t fuse_lock;
/**
+ * Get a filled in inode
+ */
+struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
+ int generation, struct fuse_attr *attr, int version);
+
+/**
+ * Send FORGET command
+ */
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+ unsigned long nodeid, int version);
+
+/**
+ * Initialise inode operations on regular files and special files
+ */
+void fuse_init_common(struct inode *inode);
+
+/**
+ * Initialise inode and file operations on a directory
+ */
+void fuse_init_dir(struct inode *inode);
+
+/**
+ * Initialise inode operations on a symlink
+ */
+void fuse_init_symlink(struct inode *inode);
+
+/**
+ * Change attributes of an inode
+ */
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);
+
+/**
* Check if the connection can be released, and if yes, then free the
* connection structure
*/
@@ -304,6 +345,16 @@ void request_send_noreply(struct fuse_co
void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
/**
+ * Get the attributes of a file
+ */
+int fuse_do_getattr(struct inode *inode);
+
+/**
+ * Invalidate inode attributes
+ */
+void fuse_invalidate_attr(struct inode *inode);
+
+/**
* Send the INIT message
*/
void fuse_send_init(struct fuse_conn *fc);
diff -Nurp a/fs/fuse/inode.c b/fs/fuse/inode.c
--- a/fs/fuse/inode.c 2005-01-11 16:28:29.000000000 +0100
+++ b/fs/fuse/inode.c 2005-01-11 16:28:29.000000000 +0100
@@ -51,12 +51,20 @@ static struct inode *fuse_alloc_inode(st
fi = get_fuse_inode(inode);
fi->i_time = jiffies - 1;
fi->nodeid = 0;
+ fi->forget_req = fuse_request_alloc();
+ if (!fi->forget_req) {
+ kmem_cache_free(fuse_inode_cachep, inode);
+ return NULL;
+ }
return inode;
}
static void fuse_destroy_inode(struct inode *inode)
{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ if (fi->forget_req)
+ fuse_request_free(fi->forget_req);
kmem_cache_free(fuse_inode_cachep, inode);
}
@@ -65,8 +73,27 @@ static void fuse_read_inode(struct inode
/* No op */
}
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+ unsigned long nodeid, int version)
+{
+ struct fuse_forget_in *inarg = &req->misc.forget_in;
+ inarg->version = version;
+ req->in.h.opcode = FUSE_FORGET;
+ req->in.h.nodeid = nodeid;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(struct fuse_forget_in);
+ req->in.args[0].value = inarg;
+ request_send_noreply(fc, req);
+}
+
static void fuse_clear_inode(struct inode *inode)
{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ if (fc) {
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ fuse_send_forget(fc, fi->forget_req, fi->nodeid, inode->i_version);
+ fi->forget_req = NULL;
+ }
}
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
@@ -94,6 +121,22 @@ static void fuse_init_inode(struct inode
{
inode->i_mode = attr->mode & S_IFMT;
i_size_write(inode, attr->size);
+ if (S_ISREG(inode->i_mode)) {
+ fuse_init_common(inode);
+ } else if (S_ISDIR(inode->i_mode))
+ fuse_init_dir(inode);
+ else if (S_ISLNK(inode->i_mode))
+ fuse_init_symlink(inode);
+ else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+ S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+ fuse_init_common(inode);
+ init_special_inode(inode, inode->i_mode,
+ new_decode_dev(attr->rdev));
+ } else {
+ /* Don't let user create weird files */
+ inode->i_mode = S_IFREG;
+ fuse_init_common(inode);
+ }
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
@@ -158,6 +201,43 @@ static void fuse_put_super(struct super_
spin_unlock(&fuse_lock);
}
+static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
+{
+ stbuf->f_type = FUSE_SUPER_MAGIC;
+ stbuf->f_bsize = attr->bsize;
+ stbuf->f_blocks = attr->blocks;
+ stbuf->f_bfree = attr->bfree;
+ stbuf->f_bavail = attr->bavail;
+ stbuf->f_files = attr->files;
+ stbuf->f_ffree = attr->ffree;
+ stbuf->f_namelen = attr->namelen;
+ /* fsid is left zero */
+}
+
+static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_req *req;
+ struct fuse_statfs_out outarg;
+ int err;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -ERESTARTSYS;
+
+ req->in.numargs = 0;
+ req->in.h.opcode = FUSE_STATFS;
+ 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;
+ if (!err)
+ convert_fuse_statfs(buf, &outarg.st);
+ fuse_put_request(fc, req);
+ return err;
+}
+
enum {
OPT_FD,
OPT_ROOTMODE,
@@ -318,6 +398,7 @@ static struct super_operations fuse_supe
.read_inode = fuse_read_inode,
.clear_inode = fuse_clear_inode,
.put_super = fuse_put_super,
+ .statfs = fuse_statfs,
.show_options = fuse_show_options,
};
diff -Nurp a/include/linux/fuse.h b/include/linux/fuse.h
--- a/include/linux/fuse.h 2005-01-11 16:28:29.000000000 +0100
+++ b/include/linux/fuse.h 2005-01-11 16:28:29.000000000 +0100
@@ -42,13 +42,61 @@ struct fuse_attr {
__u32 rdev;
};
+struct fuse_kstatfs {
+ __u64 blocks;
+ __u64 bfree;
+ __u64 bavail;
+ __u64 files;
+ __u64 ffree;
+ __u32 bsize;
+ __u32 namelen;
+};
+
enum fuse_opcode {
+ FUSE_LOOKUP = 1,
+ FUSE_FORGET = 2, /* no reply */
+ FUSE_GETATTR = 3,
+ FUSE_READLINK = 5,
+ FUSE_GETDIR = 7,
+ FUSE_STATFS = 17,
FUSE_INIT = 26
};
/* Conservative buffer size for the client */
#define FUSE_MAX_IN 8192
+#define FUSE_NAME_MAX 1024
+
+struct fuse_entry_out {
+ __u64 nodeid; /* Inode ID */
+ __u64 generation; /* Inode generation: nodeid:gen must
+ be unique for the fs's lifetime */
+ __u64 entry_valid; /* Cache timeout for the name */
+ __u64 attr_valid; /* Cache timeout for the attributes */
+ __u32 entry_valid_nsec;
+ __u32 attr_valid_nsec;
+ struct fuse_attr attr;
+};
+
+struct fuse_forget_in {
+ __u64 version;
+};
+
+struct fuse_attr_out {
+ __u64 attr_valid; /* Cache timeout for the attributes */
+ __u32 attr_valid_nsec;
+ __u32 dummy;
+ struct fuse_attr attr;
+};
+
+struct fuse_getdir_out {
+ __u32 fd;
+};
+
+struct fuse_statfs_out {
+ struct fuse_kstatfs st;
+};
+
struct fuse_init_in_out {
__u32 major;
__u32 minor;
@@ -70,3 +118,14 @@ struct fuse_out_header {
__u64 unique;
};
+struct fuse_dirent {
+ __u64 ino;
+ __u32 namelen;
+ __u32 type;
+ char name[0];
+};
+
+#define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
+#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
+#define FUSE_DIRENT_SIZE(d) \
+ FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-01-11 16:40 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-01-10 19:02 [PATCH 4/11] FUSE - read-only operations Miklos Szeredi
2005-01-10 22:18 ` Mike Waychison
2005-01-10 23:03 ` Miklos Szeredi
2005-01-11 16:26 Miklos Szeredi
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