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-rw-r--r--fs/hostfs/hostfs.h39
-rw-r--r--fs/hostfs/hostfs_kern.c669
-rw-r--r--fs/hostfs/hostfs_user.c132
3 files changed, 374 insertions, 466 deletions
diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h
index 2f34f8f2134..9c88da0e855 100644
--- a/fs/hostfs/hostfs.h
+++ b/fs/hostfs/hostfs.h
@@ -1,7 +1,7 @@
#ifndef __UM_FS_HOSTFS
#define __UM_FS_HOSTFS
-#include "os.h"
+#include <os.h>
/*
* These are exactly the same definitions as in fs.h, but the names are
@@ -28,12 +28,7 @@
* #define ATTR_KILL_SUID 2048
* #define ATTR_KILL_SGID 4096
*
- * and this is because they were added in 2.5 development in this patch:
- *
- * http://linux.bkbits.net:8080/linux-2.5/
- * cset@3caf4a12k4XgDzK7wyK-TGpSZ9u2Ww?nav=index.html
- * |src/.|src/include|src/include/linux|related/include/linux/fs.h
- *
+ * and this is because they were added in 2.5 development.
* Actually, they are not needed by most ->setattr() methods - they are set by
* callers of notify_change() to notify that the setuid/setgid bits must be
* dropped.
@@ -44,7 +39,7 @@
struct hostfs_iattr {
unsigned int ia_valid;
- mode_t ia_mode;
+ unsigned short ia_mode;
uid_t ia_uid;
gid_t ia_gid;
loff_t ia_size;
@@ -53,18 +48,29 @@ struct hostfs_iattr {
struct timespec ia_ctime;
};
-extern int stat_file(const char *path, unsigned long long *inode_out,
- int *mode_out, int *nlink_out, int *uid_out, int *gid_out,
- unsigned long long *size_out, struct timespec *atime_out,
- struct timespec *mtime_out, struct timespec *ctime_out,
- int *blksize_out, unsigned long long *blocks_out, int fd);
+struct hostfs_stat {
+ unsigned long long ino;
+ unsigned int mode;
+ unsigned int nlink;
+ unsigned int uid;
+ unsigned int gid;
+ unsigned long long size;
+ struct timespec atime, mtime, ctime;
+ unsigned int blksize;
+ unsigned long long blocks;
+ unsigned int maj;
+ unsigned int min;
+};
+
+extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
extern int access_file(char *path, int r, int w, int x);
extern int open_file(char *path, int r, int w, int append);
-extern int file_type(const char *path, int *maj, int *min);
extern void *open_dir(char *path, int *err_out);
extern char *read_dir(void *stream, unsigned long long *pos,
- unsigned long long *ino_out, int *len_out);
+ unsigned long long *ino_out, int *len_out,
+ unsigned int *type_out);
extern void close_file(void *stream);
+extern int replace_file(int oldfd, int fd);
extern void close_dir(void *stream);
extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
extern int write_file(int fd, unsigned long long *offset, const char *buf,
@@ -86,7 +92,6 @@ extern int rename_file(char *from, char *to);
extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
long long *bfree_out, long long *bavail_out,
long long *files_out, long long *ffree_out,
- void *fsid_out, int fsid_size, long *namelen_out,
- long *spare_out);
+ void *fsid_out, int fsid_size, long *namelen_out);
#endif
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 032604e5ef2..bb529f3b7f2 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -7,18 +7,20 @@
*/
#include <linux/fs.h>
+#include <linux/magic.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/statfs.h>
+#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
+#include <linux/namei.h>
#include "hostfs.h"
-#include "init.h"
-#include "kern.h"
+#include <init.h>
+#include <kern.h>
struct hostfs_inode_info {
- char *host_filename;
int fd;
fmode_t mode;
struct inode vfs_inode;
@@ -29,26 +31,15 @@ static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
return list_entry(inode, struct hostfs_inode_info, vfs_inode);
}
-#define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_path.dentry->d_inode)
-
-static int hostfs_d_delete(struct dentry *dentry)
-{
- return 1;
-}
-
-static const struct dentry_operations hostfs_dentry_ops = {
- .d_delete = hostfs_d_delete,
-};
+#define FILE_HOSTFS_I(file) HOSTFS_I(file_inode(file))
/* Changed in hostfs_args before the kernel starts running */
static char *root_ino = "";
static int append = 0;
-#define HOSTFS_SUPER_MAGIC 0x00c0ffee
-
static const struct inode_operations hostfs_iops;
static const struct inode_operations hostfs_dir_iops;
-static const struct address_space_operations hostfs_link_aops;
+static const struct inode_operations hostfs_link_iops;
#ifndef MODULE
static int __init hostfs_args(char *options, int *add)
@@ -89,71 +80,54 @@ __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_raw(dentry, name, PATH_MAX);
+ char *root;
+ size_t len;
- root = HOSTFS_I(parent->d_inode)->host_filename;
- len += strlen(root);
- name = kmalloc(len + extra + 1, GFP_KERNEL);
- if (name == NULL)
+ root = dentry->d_sb->s_fs_info;
+ len = strlen(root);
+ if (IS_ERR(p)) {
+ __putname(name);
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;
}
- strncpy(name, root, strlen(root));
+ 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);
+ return __dentry_name(dentry, name);
}
-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, -1);
- if (err)
- return err;
+ struct dentry *dentry;
+ char *name;
- ino->i_ino = i_ino;
- ino->i_mode = i_mode;
- ino->i_nlink = i_nlink;
- ino->i_size = i_size;
- ino->i_blocks = i_blocks;
- return 0;
+ dentry = d_find_alias(ino);
+ if (!dentry)
+ return NULL;
+
+ name = dentry_name(dentry);
+
+ dput(dentry);
+
+ return name;
}
static char *follow_link(char *link)
@@ -204,57 +178,15 @@ static char *follow_link(char *link)
return ERR_PTR(n);
}
-static int hostfs_read_inode(struct inode *ino)
-{
- 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;
-}
-
static struct inode *hostfs_iget(struct super_block *sb)
{
- struct inode *inode;
- long ret;
-
- inode = iget_locked(sb, 0);
+ struct inode *inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
- if (inode->i_state & I_NEW) {
- ret = hostfs_read_inode(inode);
- if (ret < 0) {
- iget_failed(inode);
- return ERR_PTR(ret);
- }
- unlock_new_inode(inode);
- }
return inode;
}
-int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
+static int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
/*
* do_statfs uses struct statfs64 internally, but the linux kernel
@@ -268,10 +200,10 @@ int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
long long f_files;
long long f_ffree;
- err = do_statfs(HOSTFS_I(dentry->d_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);
+ &sf->f_namelen);
if (err)
return err;
sf->f_blocks = f_blocks;
@@ -290,44 +222,36 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
hi = kmalloc(sizeof(*hi), GFP_KERNEL);
if (hi == NULL)
return NULL;
-
- *hi = ((struct hostfs_inode_info) { .host_filename = NULL,
- .fd = -1,
- .mode = 0 });
+ hi->fd = -1;
+ hi->mode = 0;
inode_init_once(&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);
+ truncate_inode_pages_final(&inode->i_data);
+ clear_inode(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)
+static void hostfs_i_callback(struct rcu_head *head)
{
- 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");
- }
-
+ struct inode *inode = container_of(head, struct inode, i_rcu);
kfree(HOSTFS_I(inode));
}
-static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+static void hostfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hostfs_i_callback);
+}
+
+static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
{
- struct inode *root = vfs->mnt_sb->s_root->d_inode;
- const char *root_path = HOSTFS_I(root)->host_filename;
+ const char *root_path = root->d_sb->s_fs_info;
size_t offset = strlen(root_ino) + 1;
if (strlen(root_path) > offset)
@@ -338,103 +262,140 @@ static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
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,
+ .evict_inode = hostfs_evict_inode,
.statfs = hostfs_statfs,
.show_options = hostfs_show_options,
};
-int hostfs_readdir(struct file *file, void *ent, filldir_t filldir)
+static int hostfs_readdir(struct file *file, struct dir_context *ctx)
{
void *dir;
char *name;
unsigned long long next, ino;
int error, len;
+ unsigned int type;
- name = dentry_name(file->f_path.dentry, 0);
+ name = dentry_name(file->f_path.dentry);
if (name == NULL)
return -ENOMEM;
dir = open_dir(name, &error);
- kfree(name);
+ __putname(name);
if (dir == NULL)
return -error;
- next = file->f_pos;
- while ((name = read_dir(dir, &next, &ino, &len)) != NULL) {
- error = (*filldir)(ent, name, len, file->f_pos,
- ino, DT_UNKNOWN);
- if (error) break;
- file->f_pos = next;
+ next = ctx->pos;
+ while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) {
+ if (!dir_emit(ctx, name, len, ino, type))
+ break;
+ ctx->pos = next;
}
close_dir(dir);
return 0;
}
-int hostfs_file_open(struct inode *ino, struct file *file)
+static int hostfs_file_open(struct inode *ino, struct file *file)
{
+ static DEFINE_MUTEX(open_mutex);
char *name;
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;
- /*
- * 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)
r = 1;
- name = dentry_name(file->f_path.dentry, 0);
+ name = dentry_name(file->f_path.dentry);
if (name == NULL)
return -ENOMEM;
fd = open_file(name, r, w, append);
- kfree(name);
+ __putname(name);
if (fd < 0)
return fd;
- FILE_HOSTFS_I(file)->fd = 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;
}
-int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+static int hostfs_file_release(struct inode *inode, struct file *file)
{
- return fsync_file(HOSTFS_I(dentry->d_inode)->fd, datasync);
+ filemap_write_and_wait(inode->i_mapping);
+
+ return 0;
+}
+
+static int hostfs_fsync(struct file *file, loff_t start, loff_t end,
+ int datasync)
+{
+ struct inode *inode = file->f_mapping->host;
+ int ret;
+
+ ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (ret)
+ return ret;
+
+ mutex_lock(&inode->i_mutex);
+ ret = fsync_file(HOSTFS_I(inode)->fd, datasync);
+ mutex_unlock(&inode->i_mutex);
+
+ return ret;
}
static const struct file_operations hostfs_file_fops = {
.llseek = generic_file_llseek,
- .read = do_sync_read,
+ .read = new_sync_read,
.splice_read = generic_file_splice_read,
- .aio_read = generic_file_aio_read,
- .aio_write = generic_file_aio_write,
- .write = do_sync_write,
+ .read_iter = generic_file_read_iter,
+ .write_iter = generic_file_write_iter,
+ .write = new_sync_write,
.mmap = generic_file_mmap,
.open = hostfs_file_open,
- .release = NULL,
+ .release = hostfs_file_release,
.fsync = hostfs_fsync,
};
static const struct file_operations hostfs_dir_fops = {
.llseek = generic_file_llseek,
- .readdir = hostfs_readdir,
+ .iterate = hostfs_readdir,
.read = generic_read_dir,
};
-int hostfs_writepage(struct page *page, struct writeback_control *wbc)
+static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
@@ -470,7 +431,7 @@ int hostfs_writepage(struct page *page, struct writeback_control *wbc)
return err;
}
-int hostfs_readpage(struct file *file, struct page *page)
+static int hostfs_readpage(struct file *file, struct page *page)
{
char *buffer;
long long start;
@@ -495,9 +456,9 @@ int hostfs_readpage(struct file *file, struct page *page)
return err;
}
-int hostfs_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
+static int hostfs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
@@ -507,9 +468,9 @@ int hostfs_write_begin(struct file *file, struct address_space *mapping,
return 0;
}
-int hostfs_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
+static int hostfs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
void *buffer;
@@ -543,58 +504,54 @@ static const struct address_space_operations hostfs_aops = {
.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);
+ switch (st.mode & S_IFMT) {
+ case S_IFLNK:
+ ino->i_op = &hostfs_link_iops;
break;
- case OS_TYPE_BLOCKDEV:
- init_special_inode(inode, S_IFBLK, rdev);
+ case S_IFDIR:
+ ino->i_op = &hostfs_dir_iops;
+ ino->i_fop = &hostfs_dir_fops;
break;
- case OS_TYPE_FIFO:
- init_special_inode(inode, S_IFIFO, 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;
- case OS_TYPE_SOCK:
- init_special_inode(inode, S_IFSOCK, 0);
- break;
- }
- out:
- return err;
+
+ default:
+ ino->i_op = &hostfs_iops;
+ ino->i_fop = &hostfs_file_fops;
+ ino->i_mapping->a_ops = &hostfs_aops;
+ }
+
+ ino->i_ino = st.ino;
+ ino->i_mode = st.mode;
+ set_nlink(ino, st.nlink);
+ i_uid_write(ino, st.uid);
+ i_gid_write(ino, 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)
+static int hostfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool excl)
{
struct inode *inode;
char *name;
@@ -606,12 +563,8 @@ int hostfs_create(struct inode *dir, struct dentry *dentry, int mode,
goto out;
}
- error = init_inode(inode, dentry);
- if (error)
- goto out_put;
-
error = -ENOMEM;
- name = dentry_name(dentry, 0);
+ name = dentry_name(dentry);
if (name == NULL)
goto out_put;
@@ -621,9 +574,10 @@ int hostfs_create(struct inode *dir, struct dentry *dentry, int mode,
mode & S_IROTH, mode & S_IWOTH, mode & S_IXOTH);
if (fd < 0)
error = fd;
- else error = read_name(inode, name);
+ else
+ error = read_name(inode, name);
- kfree(name);
+ __putname(name);
if (error)
goto out_put;
@@ -638,8 +592,8 @@ int hostfs_create(struct inode *dir, struct dentry *dentry, int mode,
return error;
}
-struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
- struct nameidata *nd)
+static struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
+ unsigned int flags)
{
struct inode *inode;
char *name;
@@ -651,17 +605,14 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
goto out;
}
- err = init_inode(inode, dentry);
- if (err)
- goto out_put;
-
err = -ENOMEM;
- name = dentry_name(dentry, 0);
+ name = dentry_name(dentry);
if (name == NULL)
goto out_put;
err = read_name(inode, name);
- kfree(name);
+
+ __putname(name);
if (err == -ENOENT) {
iput(inode);
inode = NULL;
@@ -670,7 +621,6 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
goto out_put;
d_add(dentry, inode);
- dentry->d_op = &hostfs_dentry_ops;
return NULL;
out_put:
@@ -679,91 +629,79 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
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;
-}
-
-int hostfs_link(struct dentry *to, struct inode *ino, struct dentry *from)
+static 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)
+ if ((from_name = dentry_name(from)) == NULL)
return -ENOMEM;
- to_name = dentry_name(to, 0);
+ to_name = dentry_name(to);
if (to_name == NULL) {
- kfree(from_name);
+ __putname(from_name);
return -ENOMEM;
}
err = link_file(to_name, from_name);
- kfree(from_name);
- kfree(to_name);
+ __putname(from_name);
+ __putname(to_name);
return err;
}
-int hostfs_unlink(struct inode *ino, struct dentry *dentry)
+static 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 ((file = dentry_name(dentry)) == NULL)
+ return -ENOMEM;
+
err = unlink_file(file);
- kfree(file);
+ __putname(file);
return err;
}
-int hostfs_symlink(struct inode *ino, struct dentry *dentry, const char *to)
+static int hostfs_symlink(struct inode *ino, struct dentry *dentry,
+ const char *to)
{
char *file;
int err;
- if ((file = inode_dentry_name(ino, dentry)) == NULL)
+ if ((file = dentry_name(dentry)) == NULL)
return -ENOMEM;
err = make_symlink(file, to);
- kfree(file);
+ __putname(file);
return err;
}
-int hostfs_mkdir(struct inode *ino, struct dentry *dentry, int mode)
+static int hostfs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
{
char *file;
int err;
- if ((file = inode_dentry_name(ino, dentry)) == NULL)
+ if ((file = dentry_name(dentry)) == NULL)
return -ENOMEM;
err = do_mkdir(file, mode);
- kfree(file);
+ __putname(file);
return err;
}
-int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
+static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
{
char *file;
int err;
- if ((file = inode_dentry_name(ino, dentry)) == NULL)
+ if ((file = dentry_name(dentry)) == NULL)
return -ENOMEM;
err = do_rmdir(file);
- kfree(file);
+ __putname(file);
return err;
}
-int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+static int hostfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
struct inode *inode;
char *name;
@@ -775,22 +713,20 @@ int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
goto out;
}
- err = init_inode(inode, dentry);
- if (err)
- goto out_put;
-
err = -ENOMEM;
- name = dentry_name(dentry, 0);
+ name = dentry_name(dentry);
if (name == NULL)
goto out_put;
init_special_inode(inode, mode, dev);
err = do_mknod(name, mode, MAJOR(dev), MINOR(dev));
- if (err)
+ if (!err)
goto out_free;
err = read_name(inode, name);
- kfree(name);
+ __putname(name);
+ if (err)
+ goto out_put;
if (err)
goto out_put;
@@ -798,40 +734,43 @@ int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
return 0;
out_free:
- kfree(name);
+ __putname(name);
out_put:
iput(inode);
out:
return err;
}
-int hostfs_rename(struct inode *from_ino, struct dentry *from,
- struct inode *to_ino, struct dentry *to)
+static int hostfs_rename(struct inode *from_ino, struct dentry *from,
+ struct inode *to_ino, struct dentry *to)
{
char *from_name, *to_name;
int err;
- if ((from_name = inode_dentry_name(from_ino, from)) == NULL)
+ if ((from_name = dentry_name(from)) == NULL)
return -ENOMEM;
- if ((to_name = inode_dentry_name(to_ino, to)) == NULL) {
- kfree(from_name);
+ 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);
+ __putname(from_name);
+ __putname(to_name);
return err;
}
-int hostfs_permission(struct inode *ino, int desired)
+static int hostfs_permission(struct inode *ino, int desired)
{
char *name;
int r = 0, w = 0, x = 0, err;
+ if (desired & MAY_NOT_BLOCK)
+ return -ECHILD;
+
if (desired & MAY_READ) r = 1;
if (desired & MAY_WRITE) w = 1;
if (desired & MAY_EXEC) x = 1;
- name = inode_name(ino, 0);
+ name = inode_name(ino);
if (name == NULL)
return -ENOMEM;
@@ -840,21 +779,22 @@ int hostfs_permission(struct inode *ino, int desired)
err = 0;
else
err = access_file(name, r, w, x);
- kfree(name);
+ __putname(name);
if (!err)
- err = generic_permission(ino, desired, NULL);
+ err = generic_permission(ino, desired);
return err;
}
-int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
+static int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
{
+ struct inode *inode = dentry->d_inode;
struct hostfs_iattr attrs;
char *name;
int err;
- int fd = HOSTFS_I(dentry->d_inode)->fd;
+ int fd = HOSTFS_I(inode)->fd;
- err = inode_change_ok(dentry->d_inode, attr);
+ err = inode_change_ok(inode, attr);
if (err)
return err;
@@ -868,11 +808,11 @@ int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
}
if (attr->ia_valid & ATTR_UID) {
attrs.ia_valid |= HOSTFS_ATTR_UID;
- attrs.ia_uid = attr->ia_uid;
+ attrs.ia_uid = from_kuid(&init_user_ns, attr->ia_uid);
}
if (attr->ia_valid & ATTR_GID) {
attrs.ia_valid |= HOSTFS_ATTR_GID;
- attrs.ia_gid = attr->ia_gid;
+ attrs.ia_gid = from_kgid(&init_user_ns, attr->ia_gid);
}
if (attr->ia_valid & ATTR_SIZE) {
attrs.ia_valid |= HOSTFS_ATTR_SIZE;
@@ -896,26 +836,24 @@ int hostfs_setattr(struct dentry *dentry, struct iattr *attr)
if (attr->ia_valid & ATTR_MTIME_SET) {
attrs.ia_valid |= HOSTFS_ATTR_MTIME_SET;
}
- name = dentry_name(dentry, 0);
+ name = dentry_name(dentry);
if (name == NULL)
return -ENOMEM;
err = set_attr(name, &attrs, fd);
- kfree(name);
+ __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))
+ truncate_setsize(inode, attr->ia_size);
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
}
static const struct inode_operations hostfs_iops = {
- .create = hostfs_create,
- .link = hostfs_link,
- .unlink = hostfs_unlink,
- .symlink = hostfs_symlink,
- .mkdir = hostfs_mkdir,
- .rmdir = hostfs_rmdir,
- .mknod = hostfs_mknod,
- .rename = hostfs_rename,
.permission = hostfs_permission,
.setattr = hostfs_setattr,
};
@@ -934,32 +872,41 @@ static const struct inode_operations hostfs_dir_iops = {
.setattr = hostfs_setattr,
};
-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 = hostfs_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 const 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)
@@ -972,6 +919,7 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
sb->s_blocksize_bits = 10;
sb->s_magic = HOSTFS_SUPER_MAGIC;
sb->s_op = &hostfs_sbops;
+ sb->s_d_op = &simple_dentry_operations;
sb->s_maxbytes = MAX_LFS_FILESIZE;
/* NULL is printed as <NULL> by sprintf: avoid that. */
@@ -979,67 +927,66 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
req_root = "";
err = -ENOMEM;
- host_root_path = kmalloc(strlen(root_ino) + 1
- + strlen(req_root) + 1, GFP_KERNEL);
+ sb->s_fs_info = host_root_path =
+ kmalloc(strlen(root_ino) + strlen(req_root) + 2, GFP_KERNEL);
if (host_root_path == NULL)
goto out;
sprintf(host_root_path, "%s/%s", root_ino, req_root);
- root_inode = hostfs_iget(sb);
- if (IS_ERR(root_inode)) {
- err = PTR_ERR(root_inode);
- goto out_free;
- }
+ root_inode = new_inode(sb);
+ if (!root_inode)
+ goto out;
- err = init_inode(root_inode, NULL);
+ err = read_name(root_inode, host_root_path);
if (err)
goto out_put;
- HOSTFS_I(root_inode)->host_filename = host_root_path;
- /*
- * Avoid that in the error path, iput(root_inode) frees again
- * host_root_path through hostfs_destroy_inode!
- */
- host_root_path = NULL;
+ 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);
+ sb->s_root = d_make_root(root_inode);
if (sb->s_root == NULL)
- goto out_put;
-
- err = hostfs_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;
- }
return 0;
out_put:
iput(root_inode);
-out_free:
- kfree(host_root_path);
out:
return err;
}
-static int hostfs_read_sb(struct file_system_type *type,
+static struct dentry *hostfs_read_sb(struct file_system_type *type,
int flags, const char *dev_name,
- void *data, struct vfsmount *mnt)
+ void *data)
+{
+ return mount_nodev(type, flags, data, hostfs_fill_sb_common);
+}
+
+static void hostfs_kill_sb(struct super_block *s)
{
- return get_sb_nodev(type, flags, data, hostfs_fill_sb_common, mnt);
+ 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,
+ .mount = hostfs_read_sb,
+ .kill_sb = hostfs_kill_sb,
.fs_flags = 0,
};
+MODULE_ALIAS_FS("hostfs");
static int __init init_hostfs(void)
{
diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
index b79424f9328..67838f3aa20 100644
--- a/fs/hostfs/hostfs_user.c
+++ b/fs/hostfs/hostfs_user.c
@@ -15,15 +15,29 @@
#include <sys/types.h>
#include <sys/vfs.h>
#include "hostfs.h"
-#include "os.h"
-#include "user.h"
#include <utime.h>
-int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
- int *nlink_out, int *uid_out, int *gid_out,
- unsigned long long *size_out, struct timespec *atime_out,
- struct timespec *mtime_out, struct timespec *ctime_out,
- int *blksize_out, unsigned long long *blocks_out, int fd)
+static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
+{
+ p->ino = buf->st_ino;
+ p->mode = buf->st_mode;
+ p->nlink = buf->st_nlink;
+ p->uid = buf->st_uid;
+ p->gid = buf->st_gid;
+ p->size = buf->st_size;
+ p->atime.tv_sec = buf->st_atime;
+ p->atime.tv_nsec = 0;
+ p->ctime.tv_sec = buf->st_ctime;
+ p->ctime.tv_nsec = 0;
+ p->mtime.tv_sec = buf->st_mtime;
+ p->mtime.tv_nsec = 0;
+ p->blksize = buf->st_blksize;
+ p->blocks = buf->st_blocks;
+ p->maj = os_major(buf->st_rdev);
+ p->min = os_minor(buf->st_rdev);
+}
+
+int stat_file(const char *path, struct hostfs_stat *p, int fd)
{
struct stat64 buf;
@@ -33,68 +47,10 @@ int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
} else if (lstat64(path, &buf) < 0) {
return -errno;
}
-
- if (inode_out != NULL)
- *inode_out = buf.st_ino;
- if (mode_out != NULL)
- *mode_out = buf.st_mode;
- if (nlink_out != NULL)
- *nlink_out = buf.st_nlink;
- if (uid_out != NULL)
- *uid_out = buf.st_uid;
- if (gid_out != NULL)
- *gid_out = buf.st_gid;
- if (size_out != NULL)
- *size_out = buf.st_size;
- if (atime_out != NULL) {
- atime_out->tv_sec = buf.st_atime;
- atime_out->tv_nsec = 0;
- }
- if (mtime_out != NULL) {
- mtime_out->tv_sec = buf.st_mtime;
- mtime_out->tv_nsec = 0;
- }
- if (ctime_out != NULL) {
- ctime_out->tv_sec = buf.st_ctime;
- ctime_out->tv_nsec = 0;
- }
- if (blksize_out != NULL)
- *blksize_out = buf.st_blksize;
- if (blocks_out != NULL)
- *blocks_out = buf.st_blocks;
+ stat64_to_hostfs(&buf, p);
return 0;
}
-int file_type(const char *path, int *maj, int *min)
-{
- struct stat64 buf;
-
- if (lstat64(path, &buf) < 0)
- return -errno;
- /*
- * We cannot pass rdev as is because glibc and the kernel disagree
- * about its definition.
- */
- if (maj != NULL)
- *maj = major(buf.st_rdev);
- if (min != NULL)
- *min = minor(buf.st_rdev);
-
- if (S_ISDIR(buf.st_mode))
- return OS_TYPE_DIR;
- else if (S_ISLNK(buf.st_mode))
- return OS_TYPE_SYMLINK;
- else if (S_ISCHR(buf.st_mode))
- return OS_TYPE_CHARDEV;
- else if (S_ISBLK(buf.st_mode))
- return OS_TYPE_BLOCKDEV;
- else if (S_ISFIFO(buf.st_mode))
- return OS_TYPE_FIFO;
- else if (S_ISSOCK(buf.st_mode))
- return OS_TYPE_SOCK;
- else return OS_TYPE_FILE;
-}
-
int access_file(char *path, int r, int w, int x)
{
int mode = 0;
@@ -136,13 +92,13 @@ void *open_dir(char *path, int *err_out)
dir = opendir(path);
*err_out = errno;
- if (dir == NULL)
- return NULL;
+
return dir;
}
char *read_dir(void *stream, unsigned long long *pos,
- unsigned long long *ino_out, int *len_out)
+ unsigned long long *ino_out, int *len_out,
+ unsigned int *type_out)
{
DIR *dir = stream;
struct dirent *ent;
@@ -153,6 +109,7 @@ char *read_dir(void *stream, unsigned long long *pos,
return NULL;
*len_out = strlen(ent->d_name);
*ino_out = ent->d_ino;
+ *type_out = ent->d_type;
*pos = telldir(dir);
return ent->d_name;
}
@@ -202,6 +159,11 @@ int fsync_file(int fd, int datasync)
return 0;
}
+int replace_file(int oldfd, int fd)
+{
+ return dup2(oldfd, fd);
+}
+
void close_file(void *stream)
{
close(*((int *) stream));
@@ -235,14 +197,14 @@ int file_create(char *name, int ur, int uw, int ux, int gr,
int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
{
+ struct hostfs_stat st;
struct timeval times[2];
- struct timespec atime_ts, mtime_ts;
int err, ma;
if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
if (fd >= 0) {
if (fchmod(fd, attrs->ia_mode) != 0)
- return (-errno);
+ return -errno;
} else if (chmod(file, attrs->ia_mode) != 0) {
return -errno;
}
@@ -279,15 +241,14 @@ int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
*/
ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
if (attrs->ia_valid & ma) {
- err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
- &atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
+ err = stat_file(file, &st, fd);
if (err != 0)
return err;
- times[0].tv_sec = atime_ts.tv_sec;
- times[0].tv_usec = atime_ts.tv_nsec / 1000;
- times[1].tv_sec = mtime_ts.tv_sec;
- times[1].tv_usec = mtime_ts.tv_nsec / 1000;
+ times[0].tv_sec = st.atime.tv_sec;
+ times[0].tv_usec = st.atime.tv_nsec / 1000;
+ times[1].tv_sec = st.mtime.tv_sec;
+ times[1].tv_usec = st.mtime.tv_nsec / 1000;
if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
times[0].tv_sec = attrs->ia_atime.tv_sec;
@@ -308,9 +269,9 @@ int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
/* Note: ctime is not handled */
if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
- err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
- &attrs->ia_atime, &attrs->ia_mtime, NULL,
- NULL, NULL, fd);
+ err = stat_file(file, &st, fd);
+ attrs->ia_atime = st.atime;
+ attrs->ia_mtime = st.mtime;
if (err != 0)
return err;
}
@@ -361,7 +322,7 @@ int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
{
int err;
- err = mknod(file, mode, makedev(major, minor));
+ err = mknod(file, mode, os_makedev(major, minor));
if (err)
return -errno;
return 0;
@@ -402,8 +363,7 @@ int rename_file(char *from, char *to)
int do_statfs(char *root, long *bsize_out, long long *blocks_out,
long long *bfree_out, long long *bavail_out,
long long *files_out, long long *ffree_out,
- void *fsid_out, int fsid_size, long *namelen_out,
- long *spare_out)
+ void *fsid_out, int fsid_size, long *namelen_out)
{
struct statfs64 buf;
int err;
@@ -422,10 +382,6 @@ int do_statfs(char *root, long *bsize_out, long long *blocks_out,
sizeof(buf.f_fsid) > fsid_size ? fsid_size :
sizeof(buf.f_fsid));
*namelen_out = buf.f_namelen;
- spare_out[0] = buf.f_spare[0];
- spare_out[1] = buf.f_spare[1];
- spare_out[2] = buf.f_spare[2];
- spare_out[3] = buf.f_spare[3];
- spare_out[4] = buf.f_spare[4];
+
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 14:57:04 +0000