static int
coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
{
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct file *host_file;
struct inode *coda_inode, *host_inode;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->mmap)
return -ENODEV;
coda_inode = coda_file->f_path.dentry->d_inode;
host_inode = host_file->f_path.dentry->d_inode;
coda_file->f_mapping = host_file->f_mapping;
if (coda_inode->i_mapping == &coda_inode->i_data)
coda_inode->i_mapping = host_inode->i_mapping;
/* only allow additional mmaps as long as userspace isn't changing
* the container file on us! */
else if (coda_inode->i_mapping != host_inode->i_mapping)
return -EBUSY;
/* keep track of how often the coda_inode/host_file has been mmapped */
cii = ITOC(coda_inode);
cii->c_mapcount++;
cfi->cfi_mapcount++;
return host_file->f_op->mmap(host_file, vma);
}
/* file operations for directories */
int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
{
struct dentry *coda_dentry = coda_file->f_dentry;
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
if (!cfi || cfi->cfi_magic != CODA_MAGIC) BUG();
host_file = cfi->cfi_container;
coda_vfs_stat.readdir++;
down(&host_file->f_dentry->d_inode->i_sem);
host_file->f_pos = coda_file->f_pos;
if ( !host_file->f_op->readdir ) {
/* Venus: we must read Venus dirents from the file */
ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
} else {
/* potemkin case: we were handed a directory inode */
ret = vfs_readdir(host_file, filldir, dirent);
}
coda_file->f_pos = host_file->f_pos;
up(&host_file->f_dentry->d_inode->i_sem);
return ret;
}
int coda_release(struct inode *coda_inode, struct file *coda_file)
{
unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
unsigned short coda_flags = coda_flags_to_cflags(flags);
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct inode *host_inode;
int err;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
coda_flags, coda_file->f_cred->fsuid);
host_inode = cfi->cfi_container->f_path.dentry->d_inode;
cii = ITOC(coda_inode);
/* did we mmap this file? */
spin_lock(&cii->c_lock);
if (coda_inode->i_mapping == &host_inode->i_data) {
cii->c_mapcount -= cfi->cfi_mapcount;
if (!cii->c_mapcount)
coda_inode->i_mapping = &coda_inode->i_data;
}
spin_unlock(&cii->c_lock);
fput(cfi->cfi_container);
kfree(coda_file->private_data);
coda_file->private_data = NULL;
/* VFS fput ignores the return value from file_operations->release, so
* there is no use returning an error here */
return 0;
}
int coda_fsync(struct file *coda_file, struct dentry *coda_dentry, int datasync)
{
struct file *host_file;
struct dentry *host_dentry;
struct inode *host_inode, *coda_inode = coda_dentry->d_inode;
struct coda_file_info *cfi;
int err = 0;
if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
S_ISLNK(coda_inode->i_mode)))
return -EINVAL;
cfi = CODA_FTOC(coda_file);
if (!cfi || cfi->cfi_magic != CODA_MAGIC) BUG();
host_file = cfi->cfi_container;
coda_vfs_stat.fsync++;
if (host_file->f_op && host_file->f_op->fsync) {
host_dentry = host_file->f_dentry;
host_inode = host_dentry->d_inode;
down(&host_inode->i_sem);
err = host_file->f_op->fsync(host_file, host_dentry, datasync);
up(&host_inode->i_sem);
}
if ( !err && !datasync ) {
lock_kernel();
err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
unlock_kernel();
}
return err;
}
static ssize_t
coda_file_write(struct file *coda_file, const char *buf, size_t count, loff_t *ppos)
{
struct inode *coda_inode = coda_file->f_dentry->d_inode;
struct coda_file_info *cfi;
struct file *host_file;
ssize_t ret;
cfi = CODA_FTOC(coda_file);
if (!cfi || cfi->cfi_magic != CODA_MAGIC) BUG();
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->write)
return -EINVAL;
down(&coda_inode->i_sem);
ret = host_file->f_op->write(host_file, buf, count, ppos);
coda_inode->i_size = host_file->f_dentry->d_inode->i_size;
coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME;
up(&coda_inode->i_sem);
return ret;
}
int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
{
struct file *host_file;
struct inode *coda_inode = coda_file->f_path.dentry->d_inode;
struct coda_file_info *cfi;
int err;
if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
S_ISLNK(coda_inode->i_mode)))
return -EINVAL;
err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
if (err)
return err;
mutex_lock(&coda_inode->i_mutex);
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
err = vfs_fsync(host_file, datasync);
if (!err && !datasync)
err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
mutex_unlock(&coda_inode->i_mutex);
return err;
}
static ssize_t
coda_file_write(struct file *coda_file, const char __user *buf, size_t count, loff_t *ppos)
{
struct inode *host_inode, *coda_inode = coda_file->f_path.dentry->d_inode;
struct coda_file_info *cfi;
struct file *host_file;
ssize_t ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->write)
return -EINVAL;
host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&coda_inode->i_mutex);
ret = host_file->f_op->write(host_file, buf, count, ppos);
coda_inode->i_size = host_inode->i_size;
coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
mutex_unlock(&coda_inode->i_mutex);
return ret;
}
static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op)
return -ENOTDIR;
if (host_file->f_op->readdir)
{
struct inode *host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, buf, filldir);
file_accessed(host_file);
}
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
}
else
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
}
static ssize_t
coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *coda_file = iocb->ki_filp;
struct coda_file_info *cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos);
}
static ssize_t
coda_file_read(struct file *coda_file, char __user *buf, size_t count, loff_t *ppos)
{
struct coda_file_info *cfi;
struct file *host_file;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->read)
return -EINVAL;
return host_file->f_op->read(host_file, buf, count, ppos);
}
static ssize_t
coda_file_sendfile(struct file *coda_file, loff_t *ppos, size_t count,
read_actor_t actor, void *target)
{
struct coda_file_info *cfi;
struct file *host_file;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->sendfile)
return -EINVAL;
return host_file->f_op->sendfile(host_file, ppos, count, actor, target);
}
static ssize_t
coda_file_splice_read(struct file *coda_file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct coda_file_info *cfi;
struct file *host_file;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op || !host_file->f_op->splice_read)
return -EINVAL;
return host_file->f_op->splice_read(host_file, ppos, pipe, count,flags);
}
int coda_release(struct inode *coda_inode, struct file *coda_file)
{
unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
unsigned short coda_flags = coda_flags_to_cflags(flags);
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct inode *host_inode;
int err = 0;
lock_kernel();
coda_vfs_stat.release++;
if (!use_coda_close) {
err = venus_release(coda_inode->i_sb, coda_i2f(coda_inode),
coda_flags);
if (err == -EOPNOTSUPP) {
use_coda_close = 1;
err = 0;
}
}
cfi = CODA_FTOC(coda_file);
if (!cfi || cfi->cfi_magic != CODA_MAGIC) BUG();
if (use_coda_close)
err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
coda_flags, &cfi->cfi_cred);
host_inode = cfi->cfi_container->f_dentry->d_inode;
cii = ITOC(coda_inode);
/* did we mmap this file? */
if (coda_inode->i_mapping == &host_inode->i_data) {
cii->c_mapcount -= cfi->cfi_mapcount;
if (!cii->c_mapcount)
coda_inode->i_mapping = &coda_inode->i_data;
}
fput(cfi->cfi_container);
kfree(coda_file->private_data);
coda_file->private_data = NULL;
unlock_kernel();
return err;
}
int coda_flush(struct file *coda_file, fl_owner_t id)
{
unsigned short flags = coda_file->f_flags & ~O_EXCL;
unsigned short coda_flags = coda_flags_to_cflags(flags);
struct coda_file_info *cfi;
struct inode *coda_inode;
int err = 0, fcnt;
lock_kernel();
coda_vfs_stat.flush++;
/* last close semantics */
fcnt = file_count(coda_file);
if (fcnt > 1)
goto out;
/* No need to make an upcall when we have not made any modifications
* to the file */
if ((coda_file->f_flags & O_ACCMODE) == O_RDONLY)
goto out;
if (use_coda_close)
goto out;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
coda_inode = coda_file->f_dentry->d_inode;
err = venus_store(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
coda_file->f_uid);
if (err == -EOPNOTSUPP) {
use_coda_close = 1;
err = 0;
}
out:
unlock_kernel();
return err;
}
static ssize_t
coda_file_splice_read(struct file *coda_file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
ssize_t (*splice_read)(struct file *, loff_t *,
struct pipe_inode_info *, size_t, unsigned int);
struct coda_file_info *cfi;
struct file *host_file;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
splice_read = host_file->f_op->splice_read;
if (!splice_read)
splice_read = default_file_splice_read;
return splice_read(host_file, ppos, pipe, count, flags);
}
/* file operations for directories */
int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
{
struct dentry *coda_dentry = coda_file->f_path.dentry;
struct coda_file_info *cfi;
struct file *host_file;
struct inode *host_inode;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
coda_vfs_stat.readdir++;
host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
if (!host_file->f_op->readdir) {
/* Venus: we must read Venus dirents from the file */
ret = coda_venus_readdir(host_file, filldir, dirent, coda_dentry);
} else {
/* potemkin case: we were handed a directory inode. */
/* Yuk, we can't call vfs_readdir because we are already
* holding the inode semaphore. */
ret = -ENOTDIR;
if (!host_file->f_op || !host_file->f_op->readdir)
goto out;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, filldir, dirent);
file_accessed(host_file);
}
}
out:
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
return ret;
}
static ssize_t
coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *coda_file = iocb->ki_filp;
struct inode *coda_inode = file_inode(coda_file);
struct coda_file_info *cfi = CODA_FTOC(coda_file);
struct file *host_file;
ssize_t ret;
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
file_start_write(host_file);
inode_lock(coda_inode);
ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos);
coda_inode->i_size = file_inode(host_file)->i_size;
coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
inode_unlock(coda_inode);
file_end_write(host_file);
return ret;
}
/* file operations for directories */
static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (!host_file->f_op)
return -ENOTDIR;
if (host_file->f_op->readdir)
{
/* potemkin case: we were handed a directory inode.
* We can't use vfs_readdir because we have to keep the file
* position in sync between the coda_file and the host_file.
* and as such we need grab the inode mutex. */
struct inode *host_inode = host_file->f_path.dentry->d_inode;
mutex_lock(&host_inode->i_mutex);
host_file->f_pos = coda_file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->readdir(host_file, buf, filldir);
file_accessed(host_file);
}
coda_file->f_pos = host_file->f_pos;
mutex_unlock(&host_inode->i_mutex);
}
else /* Venus: we must read Venus dirents from a file */
ret = coda_venus_readdir(coda_file, buf, filldir);
return ret;
}
int coda_fsync(struct file *coda_file, struct dentry *coda_dentry, int datasync)
{
struct file *host_file;
struct inode *coda_inode = coda_dentry->d_inode;
struct coda_file_info *cfi;
int err = 0;
if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
S_ISLNK(coda_inode->i_mode)))
return -EINVAL;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
err = vfs_fsync(host_file, host_file->f_path.dentry, datasync);
if ( !err && !datasync ) {
lock_kernel();
err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
unlock_kernel();
}
return err;
}
/* file operations for directories */
static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
{
struct coda_file_info *cfi;
struct file *host_file;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
if (host_file->f_op->iterate) {
struct inode *host_inode = file_inode(host_file);
mutex_lock(&host_inode->i_mutex);
ret = -ENOENT;
if (!IS_DEADDIR(host_inode)) {
ret = host_file->f_op->iterate(host_file, ctx);
file_accessed(host_file);
}
mutex_unlock(&host_inode->i_mutex);
return ret;
}
/* Venus: we must read Venus dirents from a file */
return coda_venus_readdir(coda_file, ctx);
}
int coda_flush(struct file *coda_file)
{
unsigned short flags = coda_file->f_flags & ~O_EXCL;
unsigned short coda_flags = coda_flags_to_cflags(flags);
struct coda_file_info *cfi;
struct inode *coda_inode;
int err = 0, fcnt;
coda_vfs_stat.flush++;
/* No need to make an upcall when we have not made any modifications
* to the file */
if ((coda_file->f_flags & O_ACCMODE) == O_RDONLY)
return 0;
if (use_coda_close)
return 0;
fcnt = file_count(coda_file);
if (fcnt > 1) return 0;
coda_inode = coda_file->f_dentry->d_inode;
cfi = CODA_FTOC(coda_file);
if (!cfi || cfi->cfi_magic != CODA_MAGIC) BUG();
err = venus_store(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
&cfi->cfi_cred);
if (err == -EOPNOTSUPP) {
use_coda_close = 1;
err = 0;
}
return err;
}
/* support routines */
static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
{
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct file *host_file;
struct venus_dirent *vdir;
unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
unsigned int type;
struct qstr name;
ino_t ino;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
cii = ITOC(file_inode(coda_file));
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
if (!vdir) return -ENOMEM;
if (!dir_emit_dots(coda_file, ctx))
goto out;
while (1) {
/* read entries from the directory file */
ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
sizeof(*vdir));
if (ret < 0) {
pr_err("%s: read dir %s failed %d\n",
__func__, coda_f2s(&cii->c_fid), ret);
break;
}
if (ret == 0) break; /* end of directory file reached */
/* catch truncated reads */
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
pr_err("%s: short read on %s\n",
__func__, coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
/* validate whether the directory file actually makes sense */
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
pr_err("%s: invalid dir %s\n",
__func__, coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
name.len = vdir->d_namlen;
name.name = vdir->d_name;
/* Make sure we skip '.' and '..', we already got those */
if (name.name[0] == '.' && (name.len == 1 ||
(name.name[1] == '.' && name.len == 2)))
vdir->d_fileno = name.len = 0;
/* skip null entries */
if (vdir->d_fileno && name.len) {
ino = vdir->d_fileno;
type = CDT2DT(vdir->d_type);
if (!dir_emit(ctx, name.name, name.len, ino, type))
break;
}
/* we'll always have progress because d_reclen is unsigned and
* we've already established it is non-zero. */
ctx->pos += vdir->d_reclen;
}
out:
kfree(vdir);
return 0;
}
static int coda_venus_readdir(struct file *coda_file, void *buf,
filldir_t filldir)
{
int result = 0;
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct file *host_file;
struct dentry *de;
struct venus_dirent *vdir;
unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
unsigned int type;
struct qstr name;
ino_t ino;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
de = coda_file->f_path.dentry;
cii = ITOC(de->d_inode);
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
if (!vdir) return -ENOMEM;
if (coda_file->f_pos == 0) {
ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
if (coda_file->f_pos == 1) {
ret = filldir(buf, "..", 2, 1, parent_ino(de), DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
while (1) {
ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
sizeof(*vdir));
if (ret < 0) {
printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
coda_f2s(&cii->c_fid), ret);
break;
}
if (ret == 0) break;
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
printk(KERN_ERR "coda readdir: short read on %s\n",
coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
printk(KERN_ERR "coda readdir: invalid dir %s\n",
coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
name.len = vdir->d_namlen;
name.name = vdir->d_name;
if (name.name[0] == '.' && (name.len == 1 ||
(vdir->d_name[1] == '.' && name.len == 2)))
vdir->d_fileno = name.len = 0;
if (vdir->d_fileno && name.len) {
ino = find_inode_number(de, &name);
if (!ino) ino = vdir->d_fileno;
type = CDT2DT(vdir->d_type);
ret = filldir(buf, name.name, name.len,
coda_file->f_pos, ino, type);
if (ret < 0) break;
result++;
}
coda_file->f_pos += vdir->d_reclen;
}
out:
kfree(vdir);
return result ? result : ret;
}
/* support routines */
static int coda_venus_readdir(struct file *coda_file, void *buf,
filldir_t filldir)
{
int result = 0; /* # of entries returned */
struct coda_file_info *cfi;
struct coda_inode_info *cii;
struct file *host_file;
struct dentry *de;
struct venus_dirent *vdir;
unsigned long vdir_size =
(unsigned long)(&((struct venus_dirent *)0)->d_name);
unsigned int type;
struct qstr name;
ino_t ino;
int ret;
cfi = CODA_FTOC(coda_file);
BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
host_file = cfi->cfi_container;
de = coda_file->f_path.dentry;
cii = ITOC(de->d_inode);
vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
if (!vdir) return -ENOMEM;
if (coda_file->f_pos == 0) {
ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
if (coda_file->f_pos == 1) {
ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR);
if (ret < 0)
goto out;
result++;
coda_file->f_pos++;
}
while (1) {
/* read entries from the directory file */
ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
sizeof(*vdir));
if (ret < 0) {
printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
coda_f2s(&cii->c_fid), ret);
break;
}
if (ret == 0) break; /* end of directory file reached */
/* catch truncated reads */
if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
printk(KERN_ERR "coda readdir: short read on %s\n",
coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
/* validate whether the directory file actually makes sense */
if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
printk(KERN_ERR "coda readdir: invalid dir %s\n",
coda_f2s(&cii->c_fid));
ret = -EBADF;
break;
}
name.len = vdir->d_namlen;
name.name = vdir->d_name;
/* Make sure we skip '.' and '..', we already got those */
if (name.name[0] == '.' && (name.len == 1 ||
(vdir->d_name[1] == '.' && name.len == 2)))
vdir->d_fileno = name.len = 0;
/* skip null entries */
if (vdir->d_fileno && name.len) {
/* try to look up this entry in the dcache, that way
* userspace doesn't have to worry about breaking
* getcwd by having mismatched inode numbers for
* internal volume mountpoints. */
ino = find_inode_number(de, &name);
if (!ino) ino = vdir->d_fileno;
type = CDT2DT(vdir->d_type);
ret = filldir(buf, name.name, name.len,
coda_file->f_pos, ino, type);
/* failure means no space for filling in this round */
if (ret < 0) break;
result++;
}
/* we'll always have progress because d_reclen is unsigned and
* we've already established it is non-zero. */
coda_file->f_pos += vdir->d_reclen;
}
out:
kfree(vdir);
return result ? result : ret;
}
