[mirror_ubuntu-artful-kernel.git] / fs / ext2 / file.c

/*
 *  linux/fs/ext2/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext2 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by Jakub Jelinek
 * 	(jj@sunsite.ms.mff.cuni.cz)
 */

#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

#ifdef CONFIG_FS_DAX
static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	return dax_fault(vma, vmf, ext2_get_block, NULL);
}

static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
}

static const struct vm_operations_struct ext2_dax_vm_ops = {
	.fault		= ext2_dax_fault,
	.page_mkwrite	= ext2_dax_mkwrite,
	.pfn_mkwrite	= dax_pfn_mkwrite,
};

static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	if (!IS_DAX(file_inode(file)))
		return generic_file_mmap(file, vma);

	file_accessed(file);
	vma->vm_ops = &ext2_dax_vm_ops;
	vma->vm_flags |= VM_MIXEDMAP;
	return 0;
}
#else
#define ext2_file_mmap	generic_file_mmap
#endif

/*
 * Called when filp is released. This happens when all file descriptors
 * for a single struct file are closed. Note that different open() calls
 * for the same file yield different struct file structures.
 */
static int ext2_release_file (struct inode * inode, struct file * filp)
{
	if (filp->f_mode & FMODE_WRITE) {
		mutex_lock(&EXT2_I(inode)->truncate_mutex);
		ext2_discard_reservation(inode);
		mutex_unlock(&EXT2_I(inode)->truncate_mutex);
	}
	return 0;
}

int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int ret;
	struct super_block *sb = file->f_mapping->host->i_sb;
	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;

	ret = generic_file_fsync(file, start, end, datasync);
	if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
		/* We don't really know where the IO error happened... */
		ext2_error(sb, __func__,
			   "detected IO error when writing metadata buffers");
		ret = -EIO;
	}
	return ret;
}

/*
 * We have mostly NULL's here: the current defaults are ok for
 * the ext2 filesystem.
 */
const struct file_operations ext2_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ext2_compat_ioctl,
#endif
	.mmap		= ext2_file_mmap,
	.open		= dquot_file_open,
	.release	= ext2_release_file,
	.fsync		= ext2_fsync,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
};

const struct inode_operations ext2_file_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ext2_listxattr,
	.removexattr	= generic_removexattr,
#endif
	.setattr	= ext2_setattr,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
	.fiemap		= ext2_fiemap,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/file.c
	3	*
	4	* Copyright (C) 1992, 1993, 1994, 1995
	5	* Remy Card (card@masi.ibp.fr)
	6	* Laboratoire MASI - Institut Blaise Pascal
	7	* Universite Pierre et Marie Curie (Paris VI)
	8	*
	9	* from
	10	*
	11	* linux/fs/minix/file.c
	12	*
	13	* Copyright (C) 1991, 1992 Linus Torvalds
	14	*
	15	* ext2 fs regular file handling primitives
	16	*
	17	* 64-bit file support on 64-bit platforms by Jakub Jelinek
	18	* (jj@sunsite.ms.mff.cuni.cz)
	19	*/
	20
	21	#include <linux/time.h>
48bde86d	22	#include <linux/pagemap.h>
871a2931	23	#include <linux/quotaops.h>
1da177e4 LT	24	#include "ext2.h"
	25	#include "xattr.h"
	26	#include "acl.h"
	27
6cd176a5	28	#ifdef CONFIG_FS_DAX
f7ca90b1 MW	29	static int ext2_dax_fault(struct vm_area_struct vma, struct vm_fault vmf)
f7ca90b1 MW	30	{
e842f290	31	return dax_fault(vma, vmf, ext2_get_block, NULL);
f7ca90b1 MW	32	}
	33
	34	static int ext2_dax_mkwrite(struct vm_area_struct vma, struct vm_fault vmf)
	35	{
e842f290	36	return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
f7ca90b1 MW	37	}
	38
	39	static const struct vm_operations_struct ext2_dax_vm_ops = {
	40	.fault = ext2_dax_fault,
	41	.page_mkwrite = ext2_dax_mkwrite,
0e3b210c	42	.pfn_mkwrite = dax_pfn_mkwrite,
f7ca90b1 MW	43	};
	44
	45	static int ext2_file_mmap(struct file file, struct vm_area_struct vma)
	46	{
	47	if (!IS_DAX(file_inode(file)))
	48	return generic_file_mmap(file, vma);
	49
	50	file_accessed(file);
	51	vma->vm_ops = &ext2_dax_vm_ops;
	52	vma->vm_flags \|= VM_MIXEDMAP;
	53	return 0;
	54	}
	55	#else
	56	#define ext2_file_mmap generic_file_mmap
	57	#endif
	58
1da177e4	59	/*
a6739af8 JK	60	* Called when filp is released. This happens when all file descriptors
	61	* for a single struct file are closed. Note that different open() calls
	62	* for the same file yield different struct file structures.
1da177e4 LT	63	*/
	64	static int ext2_release_file (struct inode * inode, struct file * filp)
	65	{
a686cd89 MB	66	if (filp->f_mode & FMODE_WRITE) {
	67	mutex_lock(&EXT2_I(inode)->truncate_mutex);
	68	ext2_discard_reservation(inode);
	69	mutex_unlock(&EXT2_I(inode)->truncate_mutex);
	70	}
1da177e4 LT	71	return 0;
	72	}
	73
02c24a82	74	int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
48bde86d JK	75	{
48bde86d JK	76	int ret;
7ea80859	77	struct super_block *sb = file->f_mapping->host->i_sb;
48bde86d JK	78	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
48bde86d JK	79
02c24a82	80	ret = generic_file_fsync(file, start, end, datasync);
48bde86d JK	81	if (ret == -EIO \|\| test_and_clear_bit(AS_EIO, &mapping->flags)) {
	82	/* We don't really know where the IO error happened... */
	83	ext2_error(sb, __func__,
	84	"detected IO error when writing metadata buffers");
	85	ret = -EIO;
	86	}
	87	return ret;
	88	}
	89
1da177e4 LT	90	/*
	91	* We have mostly NULL's here: the current defaults are ok for
	92	* the ext2 filesystem.
	93	*/
4b6f5d20	94	const struct file_operations ext2_file_operations = {
1da177e4	95	.llseek = generic_file_llseek,
aad4f8bb	96	.read_iter = generic_file_read_iter,
8174202b	97	.write_iter = generic_file_write_iter,
14f9f7b2	98	.unlocked_ioctl = ext2_ioctl,
e322ff07 DH	99	#ifdef CONFIG_COMPAT
	100	.compat_ioctl = ext2_compat_ioctl,
	101	#endif
f7ca90b1	102	.mmap = ext2_file_mmap,
907f4554	103	.open = dquot_file_open,
1da177e4	104	.release = ext2_release_file,
48bde86d	105	.fsync = ext2_fsync,
5274f052	106	.splice_read = generic_file_splice_read,
8d020765	107	.splice_write = iter_file_splice_write,
1da177e4 LT	108	};
1da177e4 LT	109
754661f1	110	const struct inode_operations ext2_file_inode_operations = {
1da177e4 LT	111	#ifdef CONFIG_EXT2_FS_XATTR
	112	.setxattr = generic_setxattr,
	113	.getxattr = generic_getxattr,
	114	.listxattr = ext2_listxattr,
	115	.removexattr = generic_removexattr,
	116	#endif
	117	.setattr = ext2_setattr,
4e34e719	118	.get_acl = ext2_get_acl,
64e178a7	119	.set_acl = ext2_set_acl,
68c9d702	120	.fiemap = ext2_fiemap,
1da177e4	121	};