Exemplo n.º 1
0
/**
 * v9fs_file_write - write to a file
 * @filp: file pointer to write
 * @data: data buffer to write data from
 * @count: size of buffer
 * @offset: offset at which to write data
 *
 */
static ssize_t
v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
	struct file *file = iocb->ki_filp;
	ssize_t retval;
	loff_t origin;
	int err = 0;

	retval = generic_write_checks(iocb, from);
	if (retval <= 0)
		return retval;

	origin = iocb->ki_pos;
	retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
	if (retval > 0) {
		struct inode *inode = file_inode(file);
		loff_t i_size;
		unsigned long pg_start, pg_end;
		pg_start = origin >> PAGE_SHIFT;
		pg_end = (origin + retval - 1) >> PAGE_SHIFT;
		if (inode->i_mapping && inode->i_mapping->nrpages)
			invalidate_inode_pages2_range(inode->i_mapping,
						      pg_start, pg_end);
		iocb->ki_pos += retval;
		i_size = i_size_read(inode);
		if (iocb->ki_pos > i_size) {
			inode_add_bytes(inode, iocb->ki_pos - i_size);
			i_size_write(inode, iocb->ki_pos);
		}
		return retval;
	}
	return err;
}
Exemplo n.º 2
0
ssize_t
v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
			 const char __user *data, size_t count,
			 loff_t *offset, int invalidate)
{
	int n;
	loff_t i_size;
	size_t total = 0;
	loff_t origin = *offset;
	unsigned long pg_start, pg_end;

	p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
		 data, (int)count, (int)*offset);

	do {
		n = p9_client_write(fid, NULL, data+total, origin+total, count);
		if (n <= 0)
			break;
		count -= n;
		total += n;
	} while (count > 0);

	if (invalidate && (total > 0)) {
		pg_start = origin >> PAGE_CACHE_SHIFT;
		pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
		if (inode->i_mapping && inode->i_mapping->nrpages)
			invalidate_inode_pages2_range(inode->i_mapping,
						      pg_start, pg_end);
		*offset += total;
		i_size = i_size_read(inode);
		if (*offset > i_size) {
			inode_add_bytes(inode, *offset - i_size);
			i_size_write(inode, *offset);
		}
	}
Exemplo n.º 3
0
/*
 * v9fs_xattr_set()
 *
 * Create, replace or remove an extended attribute for this inode. Buffer
 * is NULL to remove an existing extended attribute, and non-NULL to
 * either replace an existing extended attribute, or create a new extended
 * attribute. The flags XATTR_REPLACE and XATTR_CREATE
 * specify that an extended attribute must exist and must not exist
 * previous to the call, respectively.
 *
 * Returns 0, or a negative error number on failure.
 */
int v9fs_xattr_set(struct dentry *dentry, const char *name,
                   const void *value, size_t value_len, int flags)
{
    u64 offset = 0;
    int retval, msize, write_count;
    struct p9_fid *fid = NULL;

    P9_DPRINTK(P9_DEBUG_VFS, "%s: name = %s value_len = %zu flags = %d\n",
               __func__, name, value_len, flags);

    fid = v9fs_fid_clone(dentry);
    if (IS_ERR(fid)) {
        retval = PTR_ERR(fid);
        fid = NULL;
        goto error;
    }
    /*
     * On success fid points to xattr
     */
    retval = p9_client_xattrcreate(fid, name, value_len, flags);
    if (retval < 0) {
        P9_DPRINTK(P9_DEBUG_VFS,
                   "p9_client_xattrcreate failed %d\n", retval);
        goto error;
    }
    msize = fid->clnt->msize;;
    while (value_len) {
        if (value_len > (msize - P9_IOHDRSZ))
            write_count = msize - P9_IOHDRSZ;
        else
            write_count = value_len;
        write_count = p9_client_write(fid, ((char *)value)+offset,
                                      NULL, offset, write_count);
        if (write_count < 0) {
            /* error in xattr write */
            retval = write_count;
            goto error;
        }
        offset += write_count;
        value_len -= write_count;
    }
    /* Total read xattr bytes */
    retval = offset;
error:
    if (fid)
        retval = p9_client_clunk(fid);
    return retval;
}
Exemplo n.º 4
0
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
		   const void *value, size_t value_len, int flags)
{
	struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
	struct iov_iter from;
	int retval;

	iov_iter_kvec(&from, WRITE | ITER_KVEC, &kvec, 1, value_len);

	p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
		 name, value_len, flags);

	/* Clone it */
	fid = p9_client_walk(fid, 0, NULL, 1);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	/*
	 * On success fid points to xattr
	 */
	retval = p9_client_xattrcreate(fid, name, value_len, flags);
	if (retval < 0)
		p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
			 retval);
	else
		p9_client_write(fid, 0, &from, &retval);
	p9_client_clunk(fid);
	return retval;
}

ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
{
	return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
}

const struct xattr_handler *v9fs_xattr_handlers[] = {
	&v9fs_xattr_user_handler,
	&v9fs_xattr_trusted_handler,
#ifdef CONFIG_9P_FS_POSIX_ACL
	&v9fs_xattr_acl_access_handler,
	&v9fs_xattr_acl_default_handler,
#endif
#ifdef CONFIG_9P_FS_SECURITY
	&v9fs_xattr_security_handler,
#endif
	NULL
};
Exemplo n.º 5
0
int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
		   const void *value, size_t value_len, int flags)
{
	u64 offset = 0;
	int retval, msize, write_count;

	p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
		 name, value_len, flags);

	/* Clone it */
	fid = p9_client_walk(fid, 0, NULL, 1);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	/*
	 * On success fid points to xattr
	 */
	retval = p9_client_xattrcreate(fid, name, value_len, flags);
	if (retval < 0) {
		p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
			 retval);
		goto err;
	}
	msize = fid->clnt->msize;
	while (value_len) {
		if (value_len > (msize - P9_IOHDRSZ))
			write_count = msize - P9_IOHDRSZ;
		else
			write_count = value_len;
		write_count = p9_client_write(fid, ((char *)value)+offset,
					NULL, offset, write_count);
		if (write_count < 0) {
			/* error in xattr write */
			retval = write_count;
			goto err;
		}
		offset += write_count;
		value_len -= write_count;
	}
	retval = 0;
err:
	p9_client_clunk(fid);
	return retval;
}
Exemplo n.º 6
0
static ssize_t
v9fs_file_write(struct file *filp, const char __user * data,
                size_t count, loff_t * offset)
{
    int n, rsize, total = 0;
    struct p9_fid *fid;
    struct p9_client *clnt;
    struct inode *inode = filp->f_path.dentry->d_inode;
    loff_t origin = *offset;
    unsigned long pg_start, pg_end;

    P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
               (int)count, (int)*offset);

    fid = filp->private_data;
    clnt = fid->clnt;

    rsize = fid->iounit;
    if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
        rsize = clnt->msize - P9_IOHDRSZ;

    do {
        if (count < rsize)
            rsize = count;

        n = p9_client_write(fid, NULL, data+total, origin+total,
                            rsize);
        if (n <= 0)
            break;
        count -= n;
        total += n;
    } while (count > 0);

    if (total > 0) {
        pg_start = origin >> PAGE_CACHE_SHIFT;
        pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
        if (inode->i_mapping && inode->i_mapping->nrpages)
            invalidate_inode_pages2_range(inode->i_mapping,
                                          pg_start, pg_end);
        *offset += total;
        i_size_write(inode, i_size_read(inode) + total);
        inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
    }
Exemplo n.º 7
0
/**
 * v9fs_file_write - write to a file
 * @filp: file pointer to write
 * @data: data buffer to write data from
 * @count: size of buffer
 * @offset: offset at which to write data
 *
 */
static ssize_t
v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
	struct file *file = iocb->ki_filp;
	ssize_t retval = 0;
	loff_t origin = iocb->ki_pos;
	size_t count = iov_iter_count(from);
	int err = 0;

	retval = generic_write_checks(file, &origin, &count, 0);
	if (retval)
		return retval;

	iov_iter_truncate(from, count);

	if (!count)
		return 0;

	retval = p9_client_write(file->private_data, origin, from, &err);
	if (retval > 0) {
		struct inode *inode = file_inode(file);
		loff_t i_size;
		unsigned long pg_start, pg_end;
		pg_start = origin >> PAGE_CACHE_SHIFT;
		pg_end = (origin + retval - 1) >> PAGE_CACHE_SHIFT;
		if (inode->i_mapping && inode->i_mapping->nrpages)
			invalidate_inode_pages2_range(inode->i_mapping,
						      pg_start, pg_end);
		origin += retval;
		i_size = i_size_read(inode);
		iocb->ki_pos = origin;
		if (origin > i_size) {
			inode_add_bytes(inode, origin - i_size);
			i_size_write(inode, origin);
		}
		return retval;
	}
	return err;
}