[linux.git] / fs / smbfs / file.c

/*
 *  file.c
 *
 *  Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke
 *  Copyright (C) 1997 by Volker Lendecke
 *
 *  Please add a note about your changes to smbfs in the ChangeLog file.
 */

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/smp_lock.h>
#include <linux/net.h>
#include <linux/aio.h>

#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/smbno.h>
#include <linux/smb_fs.h>

#include "smb_debug.h"
#include "proto.h"

static int
smb_fsync(struct file *file, struct dentry * dentry, int datasync)
{
	struct smb_sb_info *server = server_from_dentry(dentry);
	int result;

	VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));

	/*
	 * The VFS will writepage() all dirty pages for us, but we
	 * should send a SMBflush to the server, letting it know that
	 * we want things synchronized with actual storage.
	 *
	 * Note: this function requires all pages to have been written already
	 *       (should be ok with writepage_sync)
	 */
	result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
	return result;
}

/*
 * Read a page synchronously.
 */
static int
smb_readpage_sync(struct dentry *dentry, struct page *page)
{
	char *buffer = kmap(page);
	loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
	struct smb_sb_info *server = server_from_dentry(dentry);
	unsigned int rsize = smb_get_rsize(server);
	int count = PAGE_SIZE;
	int result;

	VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n",
		DENTRY_PATH(dentry), count, offset, rsize);

	result = smb_open(dentry, SMB_O_RDONLY);
	if (result < 0)
		goto io_error;

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

		result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
		if (result < 0)
			goto io_error;

		count -= result;
		offset += result;
		buffer += result;
		dentry->d_inode->i_atime =
			current_fs_time(dentry->d_inode->i_sb);
		if (result < rsize)
			break;
	} while (count);

	memset(buffer, 0, count);
	flush_dcache_page(page);
	SetPageUptodate(page);
	result = 0;

io_error:
	kunmap(page);
	unlock_page(page);
	return result;
}

/*
 * We are called with the page locked and we unlock it when done.
 */
static int
smb_readpage(struct file *file, struct page *page)
{
	int		error;
	struct dentry  *dentry = file->f_path.dentry;

	page_cache_get(page);
	error = smb_readpage_sync(dentry, page);
	page_cache_release(page);
	return error;
}

/*
 * Write a page synchronously.
 * Offset is the data offset within the page.
 */
static int
smb_writepage_sync(struct inode *inode, struct page *page,
		   unsigned long pageoffset, unsigned int count)
{
	loff_t offset;
	char *buffer = kmap(page) + pageoffset;
	struct smb_sb_info *server = server_from_inode(inode);
	unsigned int wsize = smb_get_wsize(server);
	int ret = 0;

	offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
	VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
		inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);

	do {
		int write_ret;

		if (count < wsize)
			wsize = count;

		write_ret = server->ops->write(inode, offset, wsize, buffer);
		if (write_ret < 0) {
			PARANOIA("failed write, wsize=%d, write_ret=%d\n",
				 wsize, write_ret);
			ret = write_ret;
			break;
		}
		/* N.B. what if result < wsize?? */
#ifdef SMBFS_PARANOIA
		if (write_ret < wsize)
			PARANOIA("short write, wsize=%d, write_ret=%d\n",
				 wsize, write_ret);
#endif
		buffer += wsize;
		offset += wsize;
		count -= wsize;
		/*
		 * Update the inode now rather than waiting for a refresh.
		 */
		inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb);
		SMB_I(inode)->flags |= SMB_F_LOCALWRITE;
		if (offset > inode->i_size)
			inode->i_size = offset;
	} while (count);

	kunmap(page);
	return ret;
}

/*
 * Write a page to the server. This will be used for NFS swapping only
 * (for now), and we currently do this synchronously only.
 *
 * We are called with the page locked and we unlock it when done.
 */
static int
smb_writepage(struct page *page, struct writeback_control *wbc)
{
	struct address_space *mapping = page->mapping;
	struct inode *inode;
	unsigned long end_index;
	unsigned offset = PAGE_CACHE_SIZE;
	int err;

	BUG_ON(!mapping);
	inode = mapping->host;
	BUG_ON(!inode);

	end_index = inode->i_size >> PAGE_CACHE_SHIFT;

	/* easy case */
	if (page->index < end_index)
		goto do_it;
	/* things got complicated... */
	offset = inode->i_size & (PAGE_CACHE_SIZE-1);
	/* OK, are we completely out? */
	if (page->index >= end_index+1 || !offset)
		return 0; /* truncated - don't care */
do_it:
	page_cache_get(page);
	err = smb_writepage_sync(inode, page, 0, offset);
	SetPageUptodate(page);
	unlock_page(page);
	page_cache_release(page);
	return err;
}

static int
smb_updatepage(struct file *file, struct page *page, unsigned long offset,
	       unsigned int count)
{
	struct dentry *dentry = file->f_path.dentry;

	DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
		((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);

	return smb_writepage_sync(dentry->d_inode, page, offset, count);
}

static ssize_t
smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
			unsigned long nr_segs, loff_t pos)
{
	struct file * file = iocb->ki_filp;
	struct dentry * dentry = file->f_path.dentry;
	ssize_t	status;

	VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
		(unsigned long) iocb->ki_left, (unsigned long) pos);

	status = smb_revalidate_inode(dentry);
	if (status) {
		PARANOIA("%s/%s validation failed, error=%Zd\n",
			 DENTRY_PATH(dentry), status);
		goto out;
	}

	VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
		(long)dentry->d_inode->i_size,
		dentry->d_inode->i_flags, dentry->d_inode->i_atime);

	status = generic_file_aio_read(iocb, iov, nr_segs, pos);
out:
	return status;
}

static int
smb_file_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct dentry * dentry = file->f_path.dentry;
	int	status;

	VERBOSE("file %s/%s, address %lu - %lu\n",
		DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);

	status = smb_revalidate_inode(dentry);
	if (status) {
		PARANOIA("%s/%s validation failed, error=%d\n",
			 DENTRY_PATH(dentry), status);
		goto out;
	}
	status = generic_file_mmap(file, vma);
out:
	return status;
}

static ssize_t
smb_file_splice_read(struct file *file, loff_t *ppos,
		     struct pipe_inode_info *pipe, size_t count,
		     unsigned int flags)
{
	struct dentry *dentry = file->f_path.dentry;
	ssize_t status;

	VERBOSE("file %s/%s, pos=%Ld, count=%d\n",
		DENTRY_PATH(dentry), *ppos, count);

	status = smb_revalidate_inode(dentry);
	if (status) {
		PARANOIA("%s/%s validation failed, error=%Zd\n",
			 DENTRY_PATH(dentry), status);
		goto out;
	}
	status = generic_file_splice_read(file, ppos, pipe, count, flags);
out:
	return status;
}

/*
 * This does the "real" work of the write. The generic routine has
 * allocated the page, locked it, done all the page alignment stuff
 * calculations etc. Now we should just copy the data from user
 * space and write it back to the real medium..
 *
 * If the writer ends up delaying the write, the writer needs to
 * increment the page use counts until he is done with the page.
 */
static int smb_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;
	*pagep = __grab_cache_page(mapping, index);
	if (!*pagep)
		return -ENOMEM;
	return 0;
}

static int smb_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *page, void *fsdata)
{
	int status;
	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);

	lock_kernel();
	status = smb_updatepage(file, page, offset, copied);
	unlock_kernel();

	if (!status) {
		if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
			SetPageUptodate(page);
		status = copied;
	}

	unlock_page(page);
	page_cache_release(page);

	return status;
}

const struct address_space_operations smb_file_aops = {
	.readpage = smb_readpage,
	.writepage = smb_writepage,
	.write_begin = smb_write_begin,
	.write_end = smb_write_end,
};

/* 
 * Write to a file (through the page cache).
 */
static ssize_t
smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
			       unsigned long nr_segs, loff_t pos)
{
	struct file * file = iocb->ki_filp;
	struct dentry * dentry = file->f_path.dentry;
	ssize_t	result;

	VERBOSE("file %s/%s, count=%lu@%lu\n",
		DENTRY_PATH(dentry),
		(unsigned long) iocb->ki_left, (unsigned long) pos);

	result = smb_revalidate_inode(dentry);
	if (result) {
		PARANOIA("%s/%s validation failed, error=%Zd\n",
			 DENTRY_PATH(dentry), result);
		goto out;
	}

	result = smb_open(dentry, SMB_O_WRONLY);
	if (result)
		goto out;

	if (iocb->ki_left > 0) {
		result = generic_file_aio_write(iocb, iov, nr_segs, pos);
		VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
			(long) file->f_pos, (long) dentry->d_inode->i_size,
			dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
	}
out:
	return result;
}

static int
smb_file_open(struct inode *inode, struct file * file)
{
	int result;
	struct dentry *dentry = file->f_path.dentry;
	int smb_mode = (file->f_mode & O_ACCMODE) - 1;

	lock_kernel();
	result = smb_open(dentry, smb_mode);
	if (result)
		goto out;
	SMB_I(inode)->openers++;
out:
	unlock_kernel();
	return result;
}

static int
smb_file_release(struct inode *inode, struct file * file)
{
	lock_kernel();
	if (!--SMB_I(inode)->openers) {
		/* We must flush any dirty pages now as we won't be able to
		   write anything after close. mmap can trigger this.
		   "openers" should perhaps include mmap'ers ... */
		filemap_write_and_wait(inode->i_mapping);
		smb_close(inode);
	}
	unlock_kernel();
	return 0;
}

/*
 * Check whether the required access is compatible with
 * an inode's permission. SMB doesn't recognize superuser
 * privileges, so we need our own check for this.
 */
static int
smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
{
	int mode = inode->i_mode;
	int error = 0;

	VERBOSE("mode=%x, mask=%x\n", mode, mask);

	/* Look at user permissions */
	mode >>= 6;
	if ((mode & 7 & mask) != mask)
		error = -EACCES;
	return error;
}

const struct file_operations smb_file_operations =
{
	.llseek		= remote_llseek,
	.read		= do_sync_read,
	.aio_read	= smb_file_aio_read,
	.write		= do_sync_write,
	.aio_write	= smb_file_aio_write,
	.ioctl		= smb_ioctl,
	.mmap		= smb_file_mmap,
	.open		= smb_file_open,
	.release	= smb_file_release,
	.fsync		= smb_fsync,
	.splice_read	= smb_file_splice_read,
};

const struct inode_operations smb_file_inode_operations =
{
	.permission	= smb_file_permission,
	.getattr	= smb_getattr,
	.setattr	= smb_notify_change,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* file.c
	3	*
	4	* Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke
	5	* Copyright (C) 1997 by Volker Lendecke
	6	*
	7	* Please add a note about your changes to smbfs in the ChangeLog file.
	8	*/
	9
	10	#include <linux/time.h>
	11	#include <linux/kernel.h>
	12	#include <linux/errno.h>
	13	#include <linux/fcntl.h>
	14	#include <linux/stat.h>
	15	#include <linux/mm.h>
	16	#include <linux/slab.h>
	17	#include <linux/pagemap.h>
	18	#include <linux/smp_lock.h>
	19	#include <linux/net.h>
e8edc6e0	20	#include <linux/aio.h>
1da177e4 LT	21
	22	#include <asm/uaccess.h>
	23	#include <asm/system.h>
	24
	25	#include <linux/smbno.h>
	26	#include <linux/smb_fs.h>
	27
	28	#include "smb_debug.h"
	29	#include "proto.h"
	30
	31	static int
	32	smb_fsync(struct file file, struct dentry dentry, int datasync)
	33	{
	34	struct smb_sb_info *server = server_from_dentry(dentry);
	35	int result;
	36
	37	VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));
	38
	39	/*
	40	* The VFS will writepage() all dirty pages for us, but we
	41	* should send a SMBflush to the server, letting it know that
	42	* we want things synchronized with actual storage.
	43	*
	44	* Note: this function requires all pages to have been written already
	45	* (should be ok with writepage_sync)
	46	*/
	47	result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
	48	return result;
	49	}
	50
	51	/*
	52	* Read a page synchronously.
	53	*/
	54	static int
	55	smb_readpage_sync(struct dentry dentry, struct page page)
	56	{
	57	char *buffer = kmap(page);
	58	loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
	59	struct smb_sb_info *server = server_from_dentry(dentry);
	60	unsigned int rsize = smb_get_rsize(server);
	61	int count = PAGE_SIZE;
	62	int result;
	63
	64	VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n",
	65	DENTRY_PATH(dentry), count, offset, rsize);
	66
	67	result = smb_open(dentry, SMB_O_RDONLY);
	68	if (result < 0)
	69	goto io_error;
	70
	71	do {
	72	if (count < rsize)
	73	rsize = count;
	74
	75	result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
	76	if (result < 0)
	77	goto io_error;
	78
	79	count -= result;
	80	offset += result;
	81	buffer += result;
	82	dentry->d_inode->i_atime =
	83	current_fs_time(dentry->d_inode->i_sb);
	84	if (result < rsize)
85	break;
86	} while (count);
87
88	memset(buffer, 0, count);
89	flush_dcache_page(page);
90	SetPageUptodate(page);
91	result = 0;
92
93	io_error:
94	kunmap(page);
95	unlock_page(page);
96	return result;
97	}
98
99	/*
100	* We are called with the page locked and we unlock it when done.
101	*/
102	static int
103	smb_readpage(struct file file, struct page page)
104	{
105	int error;
17b75e69	106	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	107
	108	page_cache_get(page);
	109	error = smb_readpage_sync(dentry, page);
	110	page_cache_release(page);
	111	return error;
	112	}
	113
	114	/*
	115	* Write a page synchronously.
	116	* Offset is the data offset within the page.
	117	*/
	118	static int
	119	smb_writepage_sync(struct inode inode, struct page page,
	120	unsigned long pageoffset, unsigned int count)
	121	{
	122	loff_t offset;
	123	char *buffer = kmap(page) + pageoffset;
	124	struct smb_sb_info *server = server_from_inode(inode);
	125	unsigned int wsize = smb_get_wsize(server);
	126	int ret = 0;
	127
	128	offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
	129	VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
	130	inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);
	131
	132	do {
	133	int write_ret;
	134
	135	if (count < wsize)
	136	wsize = count;
	137
	138	write_ret = server->ops->write(inode, offset, wsize, buffer);
	139	if (write_ret < 0) {
	140	PARANOIA("failed write, wsize=%d, write_ret=%d\n",
	141	wsize, write_ret);
	142	ret = write_ret;
	143	break;
	144	}
	145	/* N.B. what if result < wsize?? */
	146	#ifdef SMBFS_PARANOIA
	147	if (write_ret < wsize)
	148	PARANOIA("short write, wsize=%d, write_ret=%d\n",
	149	wsize, write_ret);
	150	#endif
	151	buffer += wsize;
	152	offset += wsize;
	153	count -= wsize;
	154	/*
	155	* Update the inode now rather than waiting for a refresh.
	156	*/
	157	inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb);
	158	SMB_I(inode)->flags \|= SMB_F_LOCALWRITE;
	159	if (offset > inode->i_size)
	160	inode->i_size = offset;
	161	} while (count);
	162
	163	kunmap(page);
	164	return ret;
	165	}
	166
	167	/*
	168	* Write a page to the server. This will be used for NFS swapping only
	169	* (for now), and we currently do this synchronously only.
	170	*
171	* We are called with the page locked and we unlock it when done.
172	*/
173	static int
174	smb_writepage(struct page page, struct writeback_control wbc)
175	{
176	struct address_space *mapping = page->mapping;
177	struct inode *inode;
178	unsigned long end_index;
179	unsigned offset = PAGE_CACHE_SIZE;
180	int err;
181
5df0d312	182	BUG_ON(!mapping);
1da177e4	183	inode = mapping->host;
5df0d312	184	BUG_ON(!inode);
1da177e4 LT	185
	186	end_index = inode->i_size >> PAGE_CACHE_SHIFT;
	187
	188	/* easy case */
	189	if (page->index < end_index)
	190	goto do_it;
	191	/* things got complicated... */
	192	offset = inode->i_size & (PAGE_CACHE_SIZE-1);
	193	/* OK, are we completely out? */
	194	if (page->index >= end_index+1 \|\| !offset)
	195	return 0; /* truncated - don't care */
	196	do_it:
	197	page_cache_get(page);
	198	err = smb_writepage_sync(inode, page, 0, offset);
	199	SetPageUptodate(page);
	200	unlock_page(page);
	201	page_cache_release(page);
	202	return err;
	203	}
	204
	205	static int
	206	smb_updatepage(struct file file, struct page page, unsigned long offset,
	207	unsigned int count)
	208	{
17b75e69	209	struct dentry *dentry = file->f_path.dentry;
1da177e4	210
54b21a79 AM	211	DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
54b21a79 AM	212	((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
1da177e4 LT	213
	214	return smb_writepage_sync(dentry->d_inode, page, offset, count);
	215	}
	216
	217	static ssize_t
543ade1f BP	218	smb_file_aio_read(struct kiocb iocb, const struct iovec iov,
543ade1f BP	219	unsigned long nr_segs, loff_t pos)
1da177e4	220	{
543ade1f	221	struct file * file = iocb->ki_filp;
17b75e69	222	struct dentry * dentry = file->f_path.dentry;
1da177e4 LT	223	ssize_t status;
	224
	225	VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
543ade1f	226	(unsigned long) iocb->ki_left, (unsigned long) pos);
1da177e4 LT	227
	228	status = smb_revalidate_inode(dentry);
	229	if (status) {
	230	PARANOIA("%s/%s validation failed, error=%Zd\n",
	231	DENTRY_PATH(dentry), status);
	232	goto out;
	233	}
	234
	235	VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
	236	(long)dentry->d_inode->i_size,
	237	dentry->d_inode->i_flags, dentry->d_inode->i_atime);
	238
543ade1f	239	status = generic_file_aio_read(iocb, iov, nr_segs, pos);
1da177e4 LT	240	out:
	241	return status;
	242	}
	243
	244	static int
	245	smb_file_mmap(struct file * file, struct vm_area_struct * vma)
	246	{
17b75e69	247	struct dentry * dentry = file->f_path.dentry;
1da177e4 LT	248	int status;
	249
	250	VERBOSE("file %s/%s, address %lu - %lu\n",
	251	DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);
	252
	253	status = smb_revalidate_inode(dentry);
	254	if (status) {
	255	PARANOIA("%s/%s validation failed, error=%d\n",
	256	DENTRY_PATH(dentry), status);
	257	goto out;
	258	}
	259	status = generic_file_mmap(file, vma);
	260	out:
	261	return status;
	262	}
	263
	264	static ssize_t
5ffc4ef4 JA	265	smb_file_splice_read(struct file file, loff_t ppos,
	266	struct pipe_inode_info *pipe, size_t count,
	267	unsigned int flags)
1da177e4	268	{
17b75e69	269	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	270	ssize_t status;
	271
	272	VERBOSE("file %s/%s, pos=%Ld, count=%d\n",
	273	DENTRY_PATH(dentry), *ppos, count);
	274
	275	status = smb_revalidate_inode(dentry);
	276	if (status) {
	277	PARANOIA("%s/%s validation failed, error=%Zd\n",
	278	DENTRY_PATH(dentry), status);
	279	goto out;
	280	}
5ffc4ef4	281	status = generic_file_splice_read(file, ppos, pipe, count, flags);
1da177e4 LT	282	out:
	283	return status;
	284	}
	285
	286	/*
	287	* This does the "real" work of the write. The generic routine has
	288	* allocated the page, locked it, done all the page alignment stuff
	289	* calculations etc. Now we should just copy the data from user
	290	* space and write it back to the real medium..
	291	*
	292	* If the writer ends up delaying the write, the writer needs to
	293	* increment the page use counts until he is done with the page.
	294	*/
fb53b309 NP	295	static int smb_write_begin(struct file file, struct address_space mapping,
	296	loff_t pos, unsigned len, unsigned flags,
	297	struct page pagep, void fsdata)
1da177e4	298	{
fb53b309 NP	299	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
	300	*pagep = __grab_cache_page(mapping, index);
	301	if (!*pagep)
	302	return -ENOMEM;
1da177e4 LT	303	return 0;
	304	}
	305
fb53b309 NP	306	static int smb_write_end(struct file file, struct address_space mapping,
	307	loff_t pos, unsigned len, unsigned copied,
	308	struct page page, void fsdata)
1da177e4 LT	309	{
1da177e4 LT	310	int status;
fb53b309	311	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
1da177e4	312
1da177e4	313	lock_kernel();
fb53b309	314	status = smb_updatepage(file, page, offset, copied);
1da177e4	315	unlock_kernel();
fb53b309 NP	316
	317	if (!status) {
	318	if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
	319	SetPageUptodate(page);
	320	status = copied;
	321	}
	322
	323	unlock_page(page);
	324	page_cache_release(page);
	325
1da177e4 LT	326	return status;
	327	}
	328
f5e54d6e	329	const struct address_space_operations smb_file_aops = {
1da177e4 LT	330	.readpage = smb_readpage,
1da177e4 LT	331	.writepage = smb_writepage,
fb53b309 NP	332	.write_begin = smb_write_begin,
fb53b309 NP	333	.write_end = smb_write_end,
1da177e4 LT	334	};
	335
	336	/*
	337	* Write to a file (through the page cache).
	338	*/
	339	static ssize_t
543ade1f BP	340	smb_file_aio_write(struct kiocb iocb, const struct iovec iov,
543ade1f BP	341	unsigned long nr_segs, loff_t pos)
1da177e4	342	{
543ade1f	343	struct file * file = iocb->ki_filp;
17b75e69	344	struct dentry * dentry = file->f_path.dentry;
1da177e4 LT	345	ssize_t result;
	346
	347	VERBOSE("file %s/%s, count=%lu@%lu\n",
	348	DENTRY_PATH(dentry),
543ade1f	349	(unsigned long) iocb->ki_left, (unsigned long) pos);
1da177e4 LT	350
	351	result = smb_revalidate_inode(dentry);
	352	if (result) {
	353	PARANOIA("%s/%s validation failed, error=%Zd\n",
	354	DENTRY_PATH(dentry), result);
	355	goto out;
	356	}
	357
	358	result = smb_open(dentry, SMB_O_WRONLY);
	359	if (result)
	360	goto out;
	361
543ade1f BP	362	if (iocb->ki_left > 0) {
543ade1f BP	363	result = generic_file_aio_write(iocb, iov, nr_segs, pos);
1da177e4 LT	364	VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
	365	(long) file->f_pos, (long) dentry->d_inode->i_size,
	366	dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
	367	}
	368	out:
	369	return result;
	370	}
	371
	372	static int
	373	smb_file_open(struct inode inode, struct file file)
	374	{
	375	int result;
17b75e69	376	struct dentry *dentry = file->f_path.dentry;
1da177e4 LT	377	int smb_mode = (file->f_mode & O_ACCMODE) - 1;
	378
	379	lock_kernel();
	380	result = smb_open(dentry, smb_mode);
	381	if (result)
	382	goto out;
	383	SMB_I(inode)->openers++;
	384	out:
	385	unlock_kernel();
	386	return result;
	387	}
	388
	389	static int
	390	smb_file_release(struct inode inode, struct file file)
	391	{
	392	lock_kernel();
	393	if (!--SMB_I(inode)->openers) {
	394	/* We must flush any dirty pages now as we won't be able to
	395	write anything after close. mmap can trigger this.
	396	"openers" should perhaps include mmap'ers ... */
28fd1298	397	filemap_write_and_wait(inode->i_mapping);
1da177e4 LT	398	smb_close(inode);
	399	}
	400	unlock_kernel();
	401	return 0;
	402	}
	403
	404	/*
	405	* Check whether the required access is compatible with
	406	* an inode's permission. SMB doesn't recognize superuser
	407	* privileges, so we need our own check for this.
	408	*/
	409	static int
	410	smb_file_permission(struct inode inode, int mask, struct nameidata nd)
	411	{
	412	int mode = inode->i_mode;
	413	int error = 0;
	414
	415	VERBOSE("mode=%x, mask=%x\n", mode, mask);
	416
	417	/* Look at user permissions */
	418	mode >>= 6;
	419	if ((mode & 7 & mask) != mask)
	420	error = -EACCES;
	421	return error;
	422	}
	423
4b6f5d20	424	const struct file_operations smb_file_operations =
1da177e4 LT	425	{
1da177e4 LT	426	.llseek = remote_llseek,
543ade1f BP	427	.read = do_sync_read,
	428	.aio_read = smb_file_aio_read,
	429	.write = do_sync_write,
	430	.aio_write = smb_file_aio_write,
1da177e4 LT	431	.ioctl = smb_ioctl,
	432	.mmap = smb_file_mmap,
	433	.open = smb_file_open,
	434	.release = smb_file_release,
	435	.fsync = smb_fsync,
5ffc4ef4	436	.splice_read = smb_file_splice_read,
1da177e4 LT	437	};
1da177e4 LT	438
c5ef1c42	439	const struct inode_operations smb_file_inode_operations =
1da177e4 LT	440	{
	441	.permission = smb_file_permission,
	442	.getattr = smb_getattr,
	443	.setattr = smb_notify_change,
	444	};