/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*
* Ported the filesystem routines to 2.5.
* 2003-02-10 Petr Baudis <pasky@ucw.cz>
*/
-#include <linux/stddef.h>
#include <linux/fs.h>
#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
+#include <linux/mm.h>
#include <linux/pagemap.h>
-#include <linux/blkdev.h>
-#include <linux/list.h>
#include <linux/statfs.h>
-#include <linux/kdev_t.h>
-#include <asm/uaccess.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
#include "hostfs.h"
-#include "kern_util.h"
-#include "kern.h"
-#include "user_util.h"
#include "init.h"
+#include "kern.h"
struct hostfs_inode_info {
- char *host_filename;
int fd;
- int mode;
+ fmode_t mode;
struct inode vfs_inode;
};
static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
{
- return(list_entry(inode, struct hostfs_inode_info, vfs_inode));
+ return list_entry(inode, struct hostfs_inode_info, vfs_inode);
}
-#define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_dentry->d_inode)
+#define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_path.dentry->d_inode)
-int hostfs_d_delete(struct dentry *dentry)
+static int hostfs_d_delete(struct dentry *dentry)
{
- return(1);
+ return 1;
}
-struct dentry_operations hostfs_dentry_ops = {
+static const struct dentry_operations hostfs_dentry_ops = {
.d_delete = hostfs_d_delete,
};
/* Changed in hostfs_args before the kernel starts running */
-static char *root_ino = "/";
+static char *root_ino = "";
static int append = 0;
#define HOSTFS_SUPER_MAGIC 0x00c0ffee
-static struct inode_operations hostfs_iops;
-static struct inode_operations hostfs_dir_iops;
-static struct address_space_operations hostfs_link_aops;
+static const struct inode_operations hostfs_iops;
+static const struct inode_operations hostfs_dir_iops;
+static const struct inode_operations hostfs_link_iops;
#ifndef MODULE
static int __init hostfs_args(char *options, int *add)
char *ptr;
ptr = strchr(options, ',');
- if(ptr != NULL)
+ if (ptr != NULL)
*ptr++ = '\0';
- if(*options != '\0')
+ if (*options != '\0')
root_ino = options;
options = ptr;
- while(options){
+ while (options) {
ptr = strchr(options, ',');
- if(ptr != NULL)
+ if (ptr != NULL)
*ptr++ = '\0';
- if(*options != '\0'){
- if(!strcmp(options, "append"))
+ if (*options != '\0') {
+ if (!strcmp(options, "append"))
append = 1;
else printf("hostfs_args - unsupported option - %s\n",
options);
}
options = ptr;
}
- return(0);
+ return 0;
}
__uml_setup("hostfs=", hostfs_args,
);
#endif
-static char *dentry_name(struct dentry *dentry, int extra)
+static char *__dentry_name(struct dentry *dentry, char *name)
{
- struct dentry *parent;
- char *root, *name;
- int len;
-
- len = 0;
- parent = dentry;
- while(parent->d_parent != parent){
- len += parent->d_name.len + 1;
- parent = parent->d_parent;
- }
+ char *p = __dentry_path(dentry, name, PATH_MAX);
+ char *root;
+ size_t len;
+
+ spin_unlock(&dcache_lock);
- root = HOSTFS_I(parent->d_inode)->host_filename;
- len += strlen(root);
- name = kmalloc(len + extra + 1, GFP_KERNEL);
- if(name == NULL) return(NULL);
-
- name[len] = '\0';
- parent = dentry;
- while(parent->d_parent != parent){
- len -= parent->d_name.len + 1;
- name[len] = '/';
- strncpy(&name[len + 1], parent->d_name.name,
- parent->d_name.len);
- parent = parent->d_parent;
+ root = dentry->d_sb->s_fs_info;
+ len = strlen(root);
+ if (IS_ERR(p)) {
+ __putname(name);
+ return NULL;
}
- strncpy(name, root, strlen(root));
- return(name);
+ strlcpy(name, root, PATH_MAX);
+ if (len > p - name) {
+ __putname(name);
+ return NULL;
+ }
+ if (p > name + len) {
+ char *s = name + len;
+ while ((*s++ = *p++) != '\0')
+ ;
+ }
+ return name;
}
-static char *inode_name(struct inode *ino, int extra)
+static char *dentry_name(struct dentry *dentry)
{
- struct dentry *dentry;
+ char *name = __getname();
+ if (!name)
+ return NULL;
- dentry = list_entry(ino->i_dentry.next, struct dentry, d_alias);
- return(dentry_name(dentry, extra));
+ spin_lock(&dcache_lock);
+ return __dentry_name(dentry, name); /* will unlock */
}
-static int read_name(struct inode *ino, char *name)
+static char *inode_name(struct inode *ino)
{
- /* The non-int inode fields are copied into ints by stat_file and
- * then copied into the inode because passing the actual pointers
- * in and having them treated as int * breaks on big-endian machines
- */
- int err;
- int i_mode, i_nlink, i_blksize;
- unsigned long long i_size;
- unsigned long long i_ino;
- unsigned long long i_blocks;
-
- err = stat_file(name, &i_ino, &i_mode, &i_nlink, &ino->i_uid,
- &ino->i_gid, &i_size, &ino->i_atime, &ino->i_mtime,
- &ino->i_ctime, &i_blksize, &i_blocks);
- if(err)
- return(err);
-
- ino->i_ino = i_ino;
- ino->i_mode = i_mode;
- ino->i_nlink = i_nlink;
- ino->i_size = i_size;
- ino->i_blksize = i_blksize;
- ino->i_blocks = i_blocks;
- return(0);
+ struct dentry *dentry;
+ char *name = __getname();
+ if (!name)
+ return NULL;
+
+ spin_lock(&dcache_lock);
+ if (list_empty(&ino->i_dentry)) {
+ spin_unlock(&dcache_lock);
+ __putname(name);
+ return NULL;
+ }
+ dentry = list_first_entry(&ino->i_dentry, struct dentry, d_alias);
+ return __dentry_name(dentry, name); /* will unlock */
}
static char *follow_link(char *link)
char *name, *resolved, *end;
len = 64;
- while(1){
+ while (1) {
n = -ENOMEM;
name = kmalloc(len, GFP_KERNEL);
- if(name == NULL)
+ if (name == NULL)
goto out;
- n = do_readlink(link, name, len);
- if(n < len)
+ n = hostfs_do_readlink(link, name, len);
+ if (n < len)
break;
len *= 2;
kfree(name);
}
- if(n < 0)
+ if (n < 0)
goto out_free;
- if(*name == '/')
- return(name);
+ if (*name == '/')
+ return name;
end = strrchr(link, '/');
- if(end == NULL)
- return(name);
+ if (end == NULL)
+ return name;
*(end + 1) = '\0';
len = strlen(link) + strlen(name) + 1;
resolved = kmalloc(len, GFP_KERNEL);
- if(resolved == NULL){
+ if (resolved == NULL) {
n = -ENOMEM;
goto out_free;
}
sprintf(resolved, "%s%s", link, name);
kfree(name);
kfree(link);
- return(resolved);
+ return resolved;
out_free:
kfree(name);
out:
- return(ERR_PTR(n));
+ return ERR_PTR(n);
}
-static int read_inode(struct inode *ino)
+static struct inode *hostfs_iget(struct super_block *sb)
{
- char *name;
- int err = 0;
-
- /* Unfortunately, we are called from iget() when we don't have a dentry
- * allocated yet.
- */
- if(list_empty(&ino->i_dentry))
- goto out;
-
- err = -ENOMEM;
- name = inode_name(ino, 0);
- if(name == NULL)
- goto out;
-
- if(file_type(name, NULL, NULL) == OS_TYPE_SYMLINK){
- name = follow_link(name);
- if(IS_ERR(name)){
- err = PTR_ERR(name);
- goto out;
- }
- }
-
- err = read_name(ino, name);
- kfree(name);
- out:
- return(err);
+ struct inode *inode = new_inode(sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ return inode;
}
-int hostfs_statfs(struct super_block *sb, struct kstatfs *sf)
+int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
- /* do_statfs uses struct statfs64 internally, but the linux kernel
+ /*
+ * do_statfs uses struct statfs64 internally, but the linux kernel
* struct statfs still has 32-bit versions for most of these fields,
* so we convert them here
*/
long long f_files;
long long f_ffree;
- err = do_statfs(HOSTFS_I(sb->s_root->d_inode)->host_filename,
+ err = do_statfs(dentry->d_sb->s_fs_info,
&sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files,
&f_ffree, &sf->f_fsid, sizeof(sf->f_fsid),
- &sf->f_namelen, sf->f_spare);
- if(err) return(err);
+ &sf->f_namelen);
+ if (err)
+ return err;
sf->f_blocks = f_blocks;
sf->f_bfree = f_bfree;
sf->f_bavail = f_bavail;
sf->f_files = f_files;
sf->f_ffree = f_ffree;
sf->f_type = HOSTFS_SUPER_MAGIC;
- return(0);
+ return 0;
}
static struct inode *hostfs_alloc_inode(struct super_block *sb)
{
struct hostfs_inode_info *hi;
- hi = kmalloc(sizeof(*hi), GFP_KERNEL);
- if(hi == NULL)
- return(NULL);
-
- *hi = ((struct hostfs_inode_info) { .host_filename = NULL,
- .fd = -1,
- .mode = 0 });
+ hi = kzalloc(sizeof(*hi), GFP_KERNEL);
+ if (hi == NULL)
+ return NULL;
+ hi->fd = -1;
inode_init_once(&hi->vfs_inode);
- return(&hi->vfs_inode);
+ return &hi->vfs_inode;
}
-static void hostfs_delete_inode(struct inode *inode)
+static void hostfs_evict_inode(struct inode *inode)
{
truncate_inode_pages(&inode->i_data, 0);
- if(HOSTFS_I(inode)->fd != -1) {
+ end_writeback(inode);
+ if (HOSTFS_I(inode)->fd != -1) {
close_file(&HOSTFS_I(inode)->fd);
HOSTFS_I(inode)->fd = -1;
}
- clear_inode(inode);
}
static void hostfs_destroy_inode(struct inode *inode)
{
- kfree(HOSTFS_I(inode)->host_filename);
-
- /*XXX: This should not happen, probably. The check is here for
- * additional safety.*/
- if(HOSTFS_I(inode)->fd != -1) {
- close_file(&HOSTFS_I(inode)->fd);
- printk(KERN_DEBUG "Closing host fd in .destroy_inode\n");
- }
-
kfree(HOSTFS_I(inode));
}
-static void hostfs_read_inode(struct inode *inode)
+static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
- read_inode(inode);
+ const char *root_path = vfs->mnt_sb->s_fs_info;
+ size_t offset = strlen(root_ino) + 1;
+
+ if (strlen(root_path) > offset)
+ seq_printf(seq, ",%s", root_path + offset);
+
+ return 0;
}
-static struct super_operations hostfs_sbops = {
+static const struct super_operations hostfs_sbops = {
.alloc_inode = hostfs_alloc_inode,
- .drop_inode = generic_delete_inode,
- .delete_inode = hostfs_delete_inode,
.destroy_inode = hostfs_destroy_inode,
- .read_inode = hostfs_read_inode,
+ .evict_inode = hostfs_evict_inode,
.statfs = hostfs_statfs,
+ .show_options = hostfs_show_options,
};
int hostfs_readdir(struct file *file, void *ent, filldir_t filldir)
unsigned long long next, ino;
int error, len;
- name = dentry_name(file->f_dentry, 0);
- if(name == NULL) return(-ENOMEM);
+ name = dentry_name(file->f_path.dentry);
+ if (name == NULL)
+ return -ENOMEM;
dir = open_dir(name, &error);
- kfree(name);
- if(dir == NULL) return(-error);
+ __putname(name);
+ if (dir == NULL)
+ return -error;
next = file->f_pos;
- while((name = read_dir(dir, &next, &ino, &len)) != NULL){
+ while ((name = read_dir(dir, &next, &ino, &len)) != NULL) {
error = (*filldir)(ent, name, len, file->f_pos,
ino, DT_UNKNOWN);
- if(error) break;
+ if (error) break;
file->f_pos = next;
}
close_dir(dir);
- return(0);
+ return 0;
}
int hostfs_file_open(struct inode *ino, struct file *file)
{
+ static DEFINE_MUTEX(open_mutex);
char *name;
- int mode = 0, r = 0, w = 0, fd;
+ fmode_t mode = 0;
+ int err;
+ int r = 0, w = 0, fd;
mode = file->f_mode & (FMODE_READ | FMODE_WRITE);
- if((mode & HOSTFS_I(ino)->mode) == mode)
- return(0);
+ if ((mode & HOSTFS_I(ino)->mode) == mode)
+ return 0;
- /* The file may already have been opened, but with the wrong access,
- * so this resets things and reopens the file with the new access.
- */
- if(HOSTFS_I(ino)->fd != -1){
- close_file(&HOSTFS_I(ino)->fd);
- HOSTFS_I(ino)->fd = -1;
- }
+ mode |= HOSTFS_I(ino)->mode;
- HOSTFS_I(ino)->mode |= mode;
- if(HOSTFS_I(ino)->mode & FMODE_READ)
+retry:
+ if (mode & FMODE_READ)
r = 1;
- if(HOSTFS_I(ino)->mode & FMODE_WRITE)
+ if (mode & FMODE_WRITE)
w = 1;
- if(w)
+ if (w)
r = 1;
- name = dentry_name(file->f_dentry, 0);
- if(name == NULL)
- return(-ENOMEM);
+ name = dentry_name(file->f_path.dentry);
+ if (name == NULL)
+ return -ENOMEM;
fd = open_file(name, r, w, append);
- kfree(name);
- if(fd < 0) return(fd);
- FILE_HOSTFS_I(file)->fd = fd;
+ __putname(name);
+ if (fd < 0)
+ return fd;
+
+ mutex_lock(&open_mutex);
+ /* somebody else had handled it first? */
+ if ((mode & HOSTFS_I(ino)->mode) == mode) {
+ mutex_unlock(&open_mutex);
+ return 0;
+ }
+ if ((mode | HOSTFS_I(ino)->mode) != mode) {
+ mode |= HOSTFS_I(ino)->mode;
+ mutex_unlock(&open_mutex);
+ close_file(&fd);
+ goto retry;
+ }
+ if (HOSTFS_I(ino)->fd == -1) {
+ HOSTFS_I(ino)->fd = fd;
+ } else {
+ err = replace_file(fd, HOSTFS_I(ino)->fd);
+ close_file(&fd);
+ if (err < 0) {
+ mutex_unlock(&open_mutex);
+ return err;
+ }
+ }
+ HOSTFS_I(ino)->mode = mode;
+ mutex_unlock(&open_mutex);
- return(0);
+ return 0;
}
-int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+int hostfs_fsync(struct file *file, int datasync)
{
- return fsync_file(HOSTFS_I(dentry->d_inode)->fd, datasync);
+ return fsync_file(HOSTFS_I(file->f_mapping->host)->fd, datasync);
}
-static struct file_operations hostfs_file_fops = {
+static const struct file_operations hostfs_file_fops = {
.llseek = generic_file_llseek,
- .read = generic_file_read,
- .sendfile = generic_file_sendfile,
+ .read = do_sync_read,
+ .splice_read = generic_file_splice_read,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
- .readv = generic_file_readv,
- .writev = generic_file_writev,
- .write = generic_file_write,
+ .write = do_sync_write,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
.release = NULL,
.fsync = hostfs_fsync,
};
-static struct file_operations hostfs_dir_fops = {
+static const struct file_operations hostfs_dir_fops = {
.llseek = generic_file_llseek,
.readdir = hostfs_readdir,
.read = generic_read_dir,
base = ((unsigned long long) page->index) << PAGE_CACHE_SHIFT;
err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
- if(err != count){
+ if (err != count) {
ClearPageUptodate(page);
goto out;
}
buffer = kmap(page);
err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer,
PAGE_CACHE_SIZE);
- if(err < 0) goto out;
+ if (err < 0)
+ goto out;
memset(&buffer[err], 0, PAGE_CACHE_SIZE - err);
out:
kunmap(page);
unlock_page(page);
- return(err);
+ return err;
}
-int hostfs_prepare_write(struct file *file, struct page *page,
- unsigned int from, unsigned int to)
+int hostfs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
- char *buffer;
- long long start, tmp;
- int err;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
- start = (long long) page->index << PAGE_CACHE_SHIFT;
- buffer = kmap(page);
- if(from != 0){
- tmp = start;
- err = read_file(FILE_HOSTFS_I(file)->fd, &tmp, buffer,
- from);
- if(err < 0) goto out;
- }
- if(to != PAGE_CACHE_SIZE){
- start += to;
- err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer + to,
- PAGE_CACHE_SIZE - to);
- if(err < 0) goto out;
- }
- err = 0;
- out:
- kunmap(page);
- return(err);
+ *pagep = grab_cache_page_write_begin(mapping, index, flags);
+ if (!*pagep)
+ return -ENOMEM;
+ return 0;
}
-int hostfs_commit_write(struct file *file, struct page *page, unsigned from,
- unsigned to)
+int hostfs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
- struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
- char *buffer;
- long long start;
- int err = 0;
+ void *buffer;
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ int err;
- start = (long long) (page->index << PAGE_CACHE_SHIFT) + from;
buffer = kmap(page);
- err = write_file(FILE_HOSTFS_I(file)->fd, &start, buffer + from,
- to - from);
- if(err > 0) err = 0;
- if(!err && (start > inode->i_size))
- inode->i_size = start;
-
+ err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer + from, copied);
kunmap(page);
- return(err);
+
+ if (!PageUptodate(page) && err == PAGE_CACHE_SIZE)
+ SetPageUptodate(page);
+
+ /*
+ * If err > 0, write_file has added err to pos, so we are comparing
+ * i_size against the last byte written.
+ */
+ if (err > 0 && (pos > inode->i_size))
+ inode->i_size = pos;
+ unlock_page(page);
+ page_cache_release(page);
+
+ return err;
}
-static struct address_space_operations hostfs_aops = {
+static const struct address_space_operations hostfs_aops = {
.writepage = hostfs_writepage,
.readpage = hostfs_readpage,
.set_page_dirty = __set_page_dirty_nobuffers,
- .prepare_write = hostfs_prepare_write,
- .commit_write = hostfs_commit_write
+ .write_begin = hostfs_write_begin,
+ .write_end = hostfs_write_end,
};
-static int init_inode(struct inode *inode, struct dentry *dentry)
+static int read_name(struct inode *ino, char *name)
{
- char *name;
- int type, err = -ENOMEM;
- int maj, min;
- dev_t rdev = 0;
+ dev_t rdev;
+ struct hostfs_stat st;
+ int err = stat_file(name, &st, -1);
+ if (err)
+ return err;
- if(dentry){
- name = dentry_name(dentry, 0);
- if(name == NULL)
- goto out;
- type = file_type(name, &maj, &min);
- /*Reencode maj and min with the kernel encoding.*/
- rdev = MKDEV(maj, min);
- kfree(name);
- }
- else type = OS_TYPE_DIR;
+ /* Reencode maj and min with the kernel encoding.*/
+ rdev = MKDEV(st.maj, st.min);
- err = 0;
- if(type == OS_TYPE_SYMLINK)
- inode->i_op = &page_symlink_inode_operations;
- else if(type == OS_TYPE_DIR)
- inode->i_op = &hostfs_dir_iops;
- else inode->i_op = &hostfs_iops;
-
- if(type == OS_TYPE_DIR) inode->i_fop = &hostfs_dir_fops;
- else inode->i_fop = &hostfs_file_fops;
-
- if(type == OS_TYPE_SYMLINK)
- inode->i_mapping->a_ops = &hostfs_link_aops;
- else inode->i_mapping->a_ops = &hostfs_aops;
-
- switch (type) {
- case OS_TYPE_CHARDEV:
- init_special_inode(inode, S_IFCHR, rdev);
- break;
- case OS_TYPE_BLOCKDEV:
- init_special_inode(inode, S_IFBLK, rdev);
+ switch (st.mode & S_IFMT) {
+ case S_IFLNK:
+ ino->i_op = &hostfs_link_iops;
break;
- case OS_TYPE_FIFO:
- init_special_inode(inode, S_IFIFO, 0);
+ case S_IFDIR:
+ ino->i_op = &hostfs_dir_iops;
+ ino->i_fop = &hostfs_dir_fops;
break;
- case OS_TYPE_SOCK:
- init_special_inode(inode, S_IFSOCK, 0);
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFIFO:
+ case S_IFSOCK:
+ init_special_inode(ino, st.mode & S_IFMT, rdev);
+ ino->i_op = &hostfs_iops;
break;
+
+ default:
+ ino->i_op = &hostfs_iops;
+ ino->i_fop = &hostfs_file_fops;
+ ino->i_mapping->a_ops = &hostfs_aops;
}
- out:
- return(err);
+
+ ino->i_ino = st.ino;
+ ino->i_mode = st.mode;
+ ino->i_nlink = st.nlink;
+ ino->i_uid = st.uid;
+ ino->i_gid = st.gid;
+ ino->i_atime = st.atime;
+ ino->i_mtime = st.mtime;
+ ino->i_ctime = st.ctime;
+ ino->i_size = st.size;
+ ino->i_blocks = st.blocks;
+ return 0;
}
int hostfs_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd)
+ struct nameidata *nd)
{
struct inode *inode;
char *name;
int error, fd;
- error = -ENOMEM;
- inode = iget(dir->i_sb, 0);
- if(inode == NULL) goto out;
-
- error = init_inode(inode, dentry);
- if(error)
- goto out_put;
+ inode = hostfs_iget(dir->i_sb);
+ if (IS_ERR(inode)) {
+ error = PTR_ERR(inode);
+ goto out;
+ }
error = -ENOMEM;
- name = dentry_name(dentry, 0);
- if(name == NULL)
+ name = dentry_name(dentry);
+ if (name == NULL)
goto out_put;
fd = file_create(name,
mode & S_IRUSR, mode & S_IWUSR, mode & S_IXUSR,
mode & S_IRGRP, mode & S_IWGRP, mode & S_IXGRP,
mode & S_IROTH, mode & S_IWOTH, mode & S_IXOTH);
- if(fd < 0)
+ if (fd < 0)
error = fd;
- else error = read_name(inode, name);
+ else
+ error = read_name(inode, name);
- kfree(name);
- if(error)
+ __putname(name);
+ if (error)
goto out_put;
HOSTFS_I(inode)->fd = fd;
HOSTFS_I(inode)->mode = FMODE_READ | FMODE_WRITE;
d_instantiate(dentry, inode);
- return(0);
+ return 0;
out_put:
iput(inode);
out:
- return(error);
+ return error;
}
struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
- struct nameidata *nd)
+ struct nameidata *nd)
{
struct inode *inode;
char *name;
int err;
- err = -ENOMEM;
- inode = iget(ino->i_sb, 0);
- if(inode == NULL)
+ inode = hostfs_iget(ino->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
goto out;
-
- err = init_inode(inode, dentry);
- if(err)
- goto out_put;
+ }
err = -ENOMEM;
- name = dentry_name(dentry, 0);
- if(name == NULL)
+ name = dentry_name(dentry);
+ if (name == NULL)
goto out_put;
err = read_name(inode, name);
- kfree(name);
- if(err == -ENOENT){
+
+ __putname(name);
+ if (err == -ENOENT) {
iput(inode);
inode = NULL;
}
- else if(err)
+ else if (err)
goto out_put;
d_add(dentry, inode);
dentry->d_op = &hostfs_dentry_ops;
- return(NULL);
+ return NULL;
out_put:
iput(inode);
out:
- return(ERR_PTR(err));
-}
-
-static char *inode_dentry_name(struct inode *ino, struct dentry *dentry)
-{
- char *file;
- int len;
-
- file = inode_name(ino, dentry->d_name.len + 1);
- if(file == NULL) return(NULL);
- strcat(file, "/");
- len = strlen(file);
- strncat(file, dentry->d_name.name, dentry->d_name.len);
- file[len + dentry->d_name.len] = '\0';
- return(file);
+ return ERR_PTR(err);
}
int hostfs_link(struct dentry *to, struct inode *ino, struct dentry *from)
{
- char *from_name, *to_name;
- int err;
-
- if((from_name = inode_dentry_name(ino, from)) == NULL)
- return(-ENOMEM);
- to_name = dentry_name(to, 0);
- if(to_name == NULL){
- kfree(from_name);
- return(-ENOMEM);
+ char *from_name, *to_name;
+ int err;
+
+ if ((from_name = dentry_name(from)) == NULL)
+ return -ENOMEM;
+ to_name = dentry_name(to);
+ if (to_name == NULL) {
+ __putname(from_name);
+ return -ENOMEM;
}
- err = link_file(to_name, from_name);
- kfree(from_name);
- kfree(to_name);
- return(err);
+ err = link_file(to_name, from_name);
+ __putname(from_name);
+ __putname(to_name);
+ return err;
}
int hostfs_unlink(struct inode *ino, struct dentry *dentry)
char *file;
int err;
- if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM);
- if(append)
- return(-EPERM);
+ if (append)
+ return -EPERM;
+
+ if ((file = dentry_name(dentry)) == NULL)
+ return -ENOMEM;
err = unlink_file(file);
- kfree(file);
- return(err);
+ __putname(file);
+ return err;
}
int hostfs_symlink(struct inode *ino, struct dentry *dentry, const char *to)
char *file;
int err;
- if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM);
+ if ((file = dentry_name(dentry)) == NULL)
+ return -ENOMEM;
err = make_symlink(file, to);
- kfree(file);
- return(err);
+ __putname(file);
+ return err;
}
int hostfs_mkdir(struct inode *ino, struct dentry *dentry, int mode)
char *file;
int err;
- if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM);
+ if ((file = dentry_name(dentry)) == NULL)
+ return -ENOMEM;
err = do_mkdir(file, mode);
- kfree(file);
- return(err);
+ __putname(file);
+ return err;
}
int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
char *file;
int err;
- if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM);
+ if ((file = dentry_name(dentry)) == NULL)
+ return -ENOMEM;
err = do_rmdir(file);
- kfree(file);
- return(err);
+ __putname(file);
+ return err;
}
int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
struct inode *inode;
char *name;
- int err = -ENOMEM;
+ int err;
- inode = iget(dir->i_sb, 0);
- if(inode == NULL)
+ inode = hostfs_iget(dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
goto out;
-
- err = init_inode(inode, dentry);
- if(err)
- goto out_put;
+ }
err = -ENOMEM;
- name = dentry_name(dentry, 0);
- if(name == NULL)
+ name = dentry_name(dentry);
+ if (name == NULL)
goto out_put;
init_special_inode(inode, mode, dev);
- err = do_mknod(name, mode, dev);
- if(err)
+ err = do_mknod(name, mode, MAJOR(dev), MINOR(dev));
+ if (!err)
goto out_free;
err = read_name(inode, name);
- kfree(name);
- if(err)
+ __putname(name);
+ if (err)
+ goto out_put;
+ if (err)
goto out_put;
d_instantiate(dentry, inode);
- return(0);
+ return 0;
out_free:
- kfree(name);
+ __putname(name);
out_put:
iput(inode);
out:
- return(err);
+ return err;
}
int hostfs_rename(struct inode *from_ino, struct dentry *from,
char *from_name, *to_name;
int err;
- if((from_name = inode_dentry_name(from_ino, from)) == NULL)
- return(-ENOMEM);
- if((to_name = inode_dentry_name(to_ino, to)) == NULL){
- kfree(from_name);
- return(-ENOMEM);
+ if ((from_name = dentry_name(from)) == NULL)
+ return -ENOMEM;
+ if ((to_name = dentry_name(to)) == NULL) {
+ __putname(from_name);
+ return -ENOMEM;
}
err = rename_file(from_name, to_name);
- kfree(from_name);
- kfree(to_name);
- return(err);
+ __putname(from_name);
+ __putname(to_name);
+ return err;
}
-int hostfs_permission(struct inode *ino, int desired, struct nameidata *nd)
+int hostfs_permission(struct inode *ino, int desired)
{
char *name;
int r = 0, w = 0, x = 0, err;
if (desired & MAY_READ) r = 1;
if (desired & MAY_WRITE) w = 1;
if (desired & MAY_EXEC) x = 1;
- name = inode_name(ino, 0);
- if (name == NULL) return(-ENOMEM);
+ name = inode_name(ino);
+ if (name == NULL)
+ return -ENOMEM;
if (S_ISCHR(ino->i_mode) || S_ISBLK(ino->i_mode) ||
- S_ISFIFO(ino->i_mode) || S_ISSOCK(ino->i_mode))
+ S_ISFIFO(ino->i_mode) || S_ISSOCK(ino->i_mode))
err = 0;
else
err = access_file(name, r, w, x);
- kfree(name);
- if(!err)
+ __putname(name);
+ if (!err)
err = generic_permission(ino, desired, NULL);
return err;
}
int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
{
+ struct inode *inode = dentry->d_inode;
struct hostfs_iattr attrs;
char *name;
int err;
- err = inode_change_ok(dentry->d_inode, attr);
+ int fd = HOSTFS_I(inode)->fd;
+
+ err = inode_change_ok(inode, attr);
if (err)
return err;
- if(append)
+ if (append)
attr->ia_valid &= ~ATTR_SIZE;
attrs.ia_valid = 0;
- if(attr->ia_valid & ATTR_MODE){
+ if (attr->ia_valid & ATTR_MODE) {
attrs.ia_valid |= HOSTFS_ATTR_MODE;
attrs.ia_mode = attr->ia_mode;
}
- if(attr->ia_valid & ATTR_UID){
+ if (attr->ia_valid & ATTR_UID) {
attrs.ia_valid |= HOSTFS_ATTR_UID;
attrs.ia_uid = attr->ia_uid;
}
- if(attr->ia_valid & ATTR_GID){
+ if (attr->ia_valid & ATTR_GID) {
attrs.ia_valid |= HOSTFS_ATTR_GID;
attrs.ia_gid = attr->ia_gid;
}
- if(attr->ia_valid & ATTR_SIZE){
+ if (attr->ia_valid & ATTR_SIZE) {
attrs.ia_valid |= HOSTFS_ATTR_SIZE;
attrs.ia_size = attr->ia_size;
}
- if(attr->ia_valid & ATTR_ATIME){
+ if (attr->ia_valid & ATTR_ATIME) {
attrs.ia_valid |= HOSTFS_ATTR_ATIME;
attrs.ia_atime = attr->ia_atime;
}
- if(attr->ia_valid & ATTR_MTIME){
+ if (attr->ia_valid & ATTR_MTIME) {
attrs.ia_valid |= HOSTFS_ATTR_MTIME;
attrs.ia_mtime = attr->ia_mtime;
}
- if(attr->ia_valid & ATTR_CTIME){
+ if (attr->ia_valid & ATTR_CTIME) {
attrs.ia_valid |= HOSTFS_ATTR_CTIME;
attrs.ia_ctime = attr->ia_ctime;
}
- if(attr->ia_valid & ATTR_ATIME_SET){
+ if (attr->ia_valid & ATTR_ATIME_SET) {
attrs.ia_valid |= HOSTFS_ATTR_ATIME_SET;
}
- if(attr->ia_valid & ATTR_MTIME_SET){
+ if (attr->ia_valid & ATTR_MTIME_SET) {
attrs.ia_valid |= HOSTFS_ATTR_MTIME_SET;
}
- name = dentry_name(dentry, 0);
- if(name == NULL) return(-ENOMEM);
- err = set_attr(name, &attrs);
- kfree(name);
- if(err)
- return(err);
+ name = dentry_name(dentry);
+ if (name == NULL)
+ return -ENOMEM;
+ err = set_attr(name, &attrs, fd);
+ __putname(name);
+ if (err)
+ return err;
- return(inode_setattr(dentry->d_inode, attr));
-}
+ if ((attr->ia_valid & ATTR_SIZE) &&
+ attr->ia_size != i_size_read(inode)) {
+ int error;
-int hostfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
- struct kstat *stat)
-{
- generic_fillattr(dentry->d_inode, stat);
- return(0);
+ error = vmtruncate(inode, attr->ia_size);
+ if (err)
+ return err;
+ }
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
}
-static struct inode_operations hostfs_iops = {
+static const struct inode_operations hostfs_iops = {
.create = hostfs_create,
.link = hostfs_link,
.unlink = hostfs_unlink,
.rename = hostfs_rename,
.permission = hostfs_permission,
.setattr = hostfs_setattr,
- .getattr = hostfs_getattr,
};
-static struct inode_operations hostfs_dir_iops = {
+static const struct inode_operations hostfs_dir_iops = {
.create = hostfs_create,
.lookup = hostfs_lookup,
.link = hostfs_link,
.rename = hostfs_rename,
.permission = hostfs_permission,
.setattr = hostfs_setattr,
- .getattr = hostfs_getattr,
};
-int hostfs_link_readpage(struct file *file, struct page *page)
-{
- char *buffer, *name;
- int err;
-
- buffer = kmap(page);
- name = inode_name(page->mapping->host, 0);
- if(name == NULL) return(-ENOMEM);
- err = do_readlink(name, buffer, PAGE_CACHE_SIZE);
- kfree(name);
- if(err == PAGE_CACHE_SIZE)
- err = -E2BIG;
- else if(err > 0){
- flush_dcache_page(page);
- SetPageUptodate(page);
- if (PageError(page)) ClearPageError(page);
- err = 0;
+static void *hostfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ char *link = __getname();
+ if (link) {
+ char *path = dentry_name(dentry);
+ int err = -ENOMEM;
+ if (path) {
+ err = hostfs_do_readlink(path, link, PATH_MAX);
+ if (err == PATH_MAX)
+ err = -E2BIG;
+ __putname(path);
+ }
+ if (err < 0) {
+ __putname(link);
+ link = ERR_PTR(err);
+ }
+ } else {
+ link = ERR_PTR(-ENOMEM);
}
- kunmap(page);
- unlock_page(page);
- return(err);
+
+ nd_set_link(nd, link);
+ return NULL;
}
-static struct address_space_operations hostfs_link_aops = {
- .readpage = hostfs_link_readpage,
+static void hostfs_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+{
+ char *s = nd_get_link(nd);
+ if (!IS_ERR(s))
+ __putname(s);
+}
+
+static const struct inode_operations hostfs_link_iops = {
+ .readlink = generic_readlink,
+ .follow_link = hostfs_follow_link,
+ .put_link = hostfs_put_link,
};
static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
{
struct inode *root_inode;
- char *name, *data = d;
+ char *host_root_path, *req_root = d;
int err;
sb->s_blocksize = 1024;
sb->s_blocksize_bits = 10;
sb->s_magic = HOSTFS_SUPER_MAGIC;
sb->s_op = &hostfs_sbops;
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
- if((data == NULL) || (*data == '\0'))
- data = root_ino;
+ /* NULL is printed as <NULL> by sprintf: avoid that. */
+ if (req_root == NULL)
+ req_root = "";
err = -ENOMEM;
- name = kmalloc(strlen(data) + 1, GFP_KERNEL);
- if(name == NULL)
+ sb->s_fs_info = host_root_path =
+ kmalloc(strlen(root_ino) + strlen(req_root) + 2, GFP_KERNEL);
+ if (host_root_path == NULL)
goto out;
- strcpy(name, data);
+ sprintf(host_root_path, "%s/%s", root_ino, req_root);
- root_inode = iget(sb, 0);
- if(root_inode == NULL)
- goto out_free;
+ root_inode = new_inode(sb);
+ if (!root_inode)
+ goto out;
- err = init_inode(root_inode, NULL);
- if(err)
+ err = read_name(root_inode, host_root_path);
+ if (err)
goto out_put;
- HOSTFS_I(root_inode)->host_filename = name;
+ if (S_ISLNK(root_inode->i_mode)) {
+ char *name = follow_link(host_root_path);
+ if (IS_ERR(name))
+ err = PTR_ERR(name);
+ else
+ err = read_name(root_inode, name);
+ kfree(name);
+ if (err)
+ goto out_put;
+ }
err = -ENOMEM;
sb->s_root = d_alloc_root(root_inode);
- if(sb->s_root == NULL)
+ if (sb->s_root == NULL)
goto out_put;
- err = read_inode(root_inode);
- if(err){
- /* No iput in this case because the dput does that for us */
- dput(sb->s_root);
- sb->s_root = NULL;
- goto out_free;
- }
+ return 0;
- return(0);
+out_put:
+ iput(root_inode);
+out:
+ return err;
+}
- out_put:
- iput(root_inode);
- out_free:
- kfree(name);
- out:
- return(err);
+static int hostfs_read_sb(struct file_system_type *type,
+ int flags, const char *dev_name,
+ void *data, struct vfsmount *mnt)
+{
+ return get_sb_nodev(type, flags, data, hostfs_fill_sb_common, mnt);
}
-static struct super_block *hostfs_read_sb(struct file_system_type *type,
- int flags, const char *dev_name,
- void *data)
+static void hostfs_kill_sb(struct super_block *s)
{
- return(get_sb_nodev(type, flags, data, hostfs_fill_sb_common));
+ kill_anon_super(s);
+ kfree(s->s_fs_info);
}
static struct file_system_type hostfs_type = {
.owner = THIS_MODULE,
.name = "hostfs",
.get_sb = hostfs_read_sb,
- .kill_sb = kill_anon_super,
+ .kill_sb = hostfs_kill_sb,
.fs_flags = 0,
};
static int __init init_hostfs(void)
{
- return(register_filesystem(&hostfs_type));
+ return register_filesystem(&hostfs_type);
}
static void __exit exit_hostfs(void)
module_init(init_hostfs)
module_exit(exit_hostfs)
MODULE_LICENSE("GPL");
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
Code Review / linux-2.6.git / blobdiff