[mirror_ubuntu-jammy-kernel.git] / fs / nfs / nfs4file.c

/*
 *  linux/fs/nfs/file.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 */
#include <linux/fs.h>
#include <linux/falloc.h>
#include <linux/nfs_fs.h>
#include "internal.h"
#include "fscache.h"
#include "pnfs.h"

#ifdef CONFIG_NFS_V4_2
#include "nfs42.h"
#endif

#define NFSDBG_FACILITY		NFSDBG_FILE

static int
nfs4_file_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;
	struct dentry *dentry = filp->f_path.dentry;
	struct dentry *parent = NULL;
	struct inode *dir;
	unsigned openflags = filp->f_flags;
	struct iattr attr;
	int opened = 0;
	int err;

	/*
	 * If no cached dentry exists or if it's negative, NFSv4 handled the
	 * opens in ->lookup() or ->create().
	 *
	 * We only get this far for a cached positive dentry.  We skipped
	 * revalidation, so handle it here by dropping the dentry and returning
	 * -EOPENSTALE.  The VFS will retry the lookup/create/open.
	 */

	dprintk("NFS: open file(%pd2)\n", dentry);

	if ((openflags & O_ACCMODE) == 3)
		openflags--;

	/* We can't create new files here */
	openflags &= ~(O_CREAT|O_EXCL);

	parent = dget_parent(dentry);
	dir = parent->d_inode;

	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	err = PTR_ERR(ctx);
	if (IS_ERR(ctx))
		goto out;

	attr.ia_valid = ATTR_OPEN;
	if (openflags & O_TRUNC) {
		attr.ia_valid |= ATTR_SIZE;
		attr.ia_size = 0;
		nfs_wb_all(inode);
	}

	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		switch (err) {
		case -EPERM:
		case -EACCES:
		case -EDQUOT:
		case -ENOSPC:
		case -EROFS:
			goto out_put_ctx;
		default:
			goto out_drop;
		}
	}
	if (inode != dentry->d_inode)
		goto out_drop;

	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	nfs_file_set_open_context(filp, ctx);
	nfs_fscache_open_file(inode, filp);
	err = 0;

out_put_ctx:
	put_nfs_open_context(ctx);
out:
	dput(parent);
	return err;

out_drop:
	d_drop(dentry);
	err = -EOPENSTALE;
	goto out_put_ctx;
}

static int
nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int ret;
	struct inode *inode = file_inode(file);

	do {
		ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
		if (ret != 0)
			break;
		mutex_lock(&inode->i_mutex);
		ret = nfs_file_fsync_commit(file, start, end, datasync);
		if (!ret)
			ret = pnfs_layoutcommit_inode(inode, true);
		mutex_unlock(&inode->i_mutex);
		/*
		 * If nfs_file_fsync_commit detected a server reboot, then
		 * resend all dirty pages that might have been covered by
		 * the NFS_CONTEXT_RESEND_WRITES flag
		 */
		start = 0;
		end = LLONG_MAX;
	} while (ret == -EAGAIN);

	return ret;
}

#ifdef CONFIG_NFS_V4_2
static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
{
	loff_t ret;

	switch (whence) {
	case SEEK_HOLE:
	case SEEK_DATA:
		ret = nfs42_proc_llseek(filep, offset, whence);
		if (ret != -ENOTSUPP)
			return ret;
	default:
		return nfs_file_llseek(filep, offset, whence);
	}
}

static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
{
	struct inode *inode = file_inode(filep);
	long ret;

	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
		return -EOPNOTSUPP;

	ret = inode_newsize_ok(inode, offset + len);
	if (ret < 0)
		return ret;

	mutex_lock(&inode->i_mutex);
	if (mode & FALLOC_FL_PUNCH_HOLE)
		ret = nfs42_proc_deallocate(filep, offset, len);
	else
		ret = nfs42_proc_allocate(filep, offset, len);
	mutex_unlock(&inode->i_mutex);

	nfs_zap_caches(inode);
	return ret;
}
#endif /* CONFIG_NFS_V4_2 */

const struct file_operations nfs4_file_operations = {
#ifdef CONFIG_NFS_V4_2
	.llseek		= nfs4_file_llseek,
#else
	.llseek		= nfs_file_llseek,
#endif
	.read		= new_sync_read,
	.write		= new_sync_write,
	.read_iter	= nfs_file_read,
	.write_iter	= nfs_file_write,
	.mmap		= nfs_file_mmap,
	.open		= nfs4_file_open,
	.flush		= nfs_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs4_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= nfs_file_splice_read,
	.splice_write	= iter_file_splice_write,
#ifdef CONFIG_NFS_V4_2
	.fallocate	= nfs42_fallocate,
#endif /* CONFIG_NFS_V4_2 */
	.check_flags	= nfs_check_flags,
	.setlease	= simple_nosetlease,
};
Commit	Line	Data
ce4ef7c0 BS	1	/*
	2	* linux/fs/nfs/file.c
	3	*
	4	* Copyright (C) 1992 Rick Sladkey
	5	*/
f4ac1674 AS	6	#include <linux/fs.h>
f4ac1674 AS	7	#include <linux/falloc.h>
ce4ef7c0 BS	8	#include <linux/nfs_fs.h>
ce4ef7c0 BS	9	#include "internal.h"
a4ff1468	10	#include "fscache.h"
ce4ef7c0 BS	11	#include "pnfs.h"
ce4ef7c0 BS	12
1c6dcbe5 AS	13	#ifdef CONFIG_NFS_V4_2
	14	#include "nfs42.h"
	15	#endif
	16
ce4ef7c0 BS	17	#define NFSDBG_FACILITY NFSDBG_FILE
	18
	19	static int
	20	nfs4_file_open(struct inode inode, struct file filp)
	21	{
	22	struct nfs_open_context *ctx;
	23	struct dentry *dentry = filp->f_path.dentry;
	24	struct dentry *parent = NULL;
	25	struct inode *dir;
	26	unsigned openflags = filp->f_flags;
	27	struct iattr attr;
5bc2afc2	28	int opened = 0;
ce4ef7c0 BS	29	int err;
ce4ef7c0 BS	30
ce4ef7c0 BS	31	/*
	32	* If no cached dentry exists or if it's negative, NFSv4 handled the
	33	* opens in ->lookup() or ->create().
	34	*
	35	* We only get this far for a cached positive dentry. We skipped
	36	* revalidation, so handle it here by dropping the dentry and returning
	37	* -EOPENSTALE. The VFS will retry the lookup/create/open.
	38	*/
	39
6de1472f	40	dprintk("NFS: open file(%pd2)\n", dentry);
ce4ef7c0 BS	41
	42	if ((openflags & O_ACCMODE) == 3)
	43	openflags--;
	44
	45	/* We can't create new files here */
	46	openflags &= ~(O_CREAT\|O_EXCL);
	47
	48	parent = dget_parent(dentry);
	49	dir = parent->d_inode;
	50
	51	ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
	52	err = PTR_ERR(ctx);
	53	if (IS_ERR(ctx))
	54	goto out;
	55
	56	attr.ia_valid = ATTR_OPEN;
	57	if (openflags & O_TRUNC) {
	58	attr.ia_valid \|= ATTR_SIZE;
	59	attr.ia_size = 0;
	60	nfs_wb_all(inode);
	61	}
	62
5bc2afc2	63	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
ce4ef7c0 BS	64	if (IS_ERR(inode)) {
	65	err = PTR_ERR(inode);
	66	switch (err) {
	67	case -EPERM:
	68	case -EACCES:
	69	case -EDQUOT:
	70	case -ENOSPC:
	71	case -EROFS:
	72	goto out_put_ctx;
	73	default:
	74	goto out_drop;
	75	}
	76	}
ce4ef7c0 BS	77	if (inode != dentry->d_inode)
	78	goto out_drop;
	79
	80	nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
	81	nfs_file_set_open_context(filp, ctx);
f1fe29b4	82	nfs_fscache_open_file(inode, filp);
ce4ef7c0 BS	83	err = 0;
	84
	85	out_put_ctx:
	86	put_nfs_open_context(ctx);
	87	out:
	88	dput(parent);
	89	return err;
	90
	91	out_drop:
	92	d_drop(dentry);
	93	err = -EOPENSTALE;
	94	goto out_put_ctx;
	95	}
	96
	97	static int
	98	nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
	99	{
	100	int ret;
496ad9aa	101	struct inode *inode = file_inode(file);
ce4ef7c0	102
05990d1b TM	103	do {
	104	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	105	if (ret != 0)
	106	break;
	107	mutex_lock(&inode->i_mutex);
	108	ret = nfs_file_fsync_commit(file, start, end, datasync);
1b33809e	109	if (!ret)
05990d1b TM	110	ret = pnfs_layoutcommit_inode(inode, true);
05990d1b TM	111	mutex_unlock(&inode->i_mutex);
dcfc4f25 TM	112	/*
	113	* If nfs_file_fsync_commit detected a server reboot, then
	114	* resend all dirty pages that might have been covered by
	115	* the NFS_CONTEXT_RESEND_WRITES flag
	116	*/
	117	start = 0;
	118	end = LLONG_MAX;
05990d1b TM	119	} while (ret == -EAGAIN);
05990d1b TM	120
ce4ef7c0 BS	121	return ret;
	122	}
	123
1c6dcbe5 AS	124	#ifdef CONFIG_NFS_V4_2
	125	static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
	126	{
	127	loff_t ret;
	128
	129	switch (whence) {
	130	case SEEK_HOLE:
	131	case SEEK_DATA:
	132	ret = nfs42_proc_llseek(filep, offset, whence);
	133	if (ret != -ENOTSUPP)
	134	return ret;
	135	default:
	136	return nfs_file_llseek(filep, offset, whence);
	137	}
	138	}
f4ac1674 AS	139
	140	static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
	141	{
	142	struct inode *inode = file_inode(filep);
	143	long ret;
	144
	145	if (!S_ISREG(inode->i_mode))
	146	return -EOPNOTSUPP;
	147
624bd5b7	148	if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE \| FALLOC_FL_KEEP_SIZE)))
f4ac1674 AS	149	return -EOPNOTSUPP;
	150
	151	ret = inode_newsize_ok(inode, offset + len);
	152	if (ret < 0)
	153	return ret;
	154
	155	mutex_lock(&inode->i_mutex);
624bd5b7 AS	156	if (mode & FALLOC_FL_PUNCH_HOLE)
	157	ret = nfs42_proc_deallocate(filep, offset, len);
	158	else
	159	ret = nfs42_proc_allocate(filep, offset, len);
f4ac1674 AS	160	mutex_unlock(&inode->i_mutex);
	161
	162	nfs_zap_caches(inode);
	163	return ret;
	164	}
1c6dcbe5 AS	165	#endif /* CONFIG_NFS_V4_2 */
1c6dcbe5 AS	166
ce4ef7c0	167	const struct file_operations nfs4_file_operations = {
1c6dcbe5 AS	168	#ifdef CONFIG_NFS_V4_2
	169	.llseek = nfs4_file_llseek,
	170	#else
ce4ef7c0	171	.llseek = nfs_file_llseek,
1c6dcbe5	172	#endif
3aa2d199	173	.read = new_sync_read,
edaf4369	174	.write = new_sync_write,
3aa2d199	175	.read_iter = nfs_file_read,
edaf4369	176	.write_iter = nfs_file_write,
ce4ef7c0 BS	177	.mmap = nfs_file_mmap,
	178	.open = nfs4_file_open,
	179	.flush = nfs_file_flush,
	180	.release = nfs_file_release,
	181	.fsync = nfs4_file_fsync,
	182	.lock = nfs_lock,
	183	.flock = nfs_flock,
	184	.splice_read = nfs_file_splice_read,
4da54c21	185	.splice_write = iter_file_splice_write,
f4ac1674 AS	186	#ifdef CONFIG_NFS_V4_2
	187	.fallocate = nfs42_fallocate,
	188	#endif /* CONFIG_NFS_V4_2 */
ce4ef7c0	189	.check_flags = nfs_check_flags,
1c994a09	190	.setlease = simple_nosetlease,
ce4ef7c0	191	};