[linux.git] / fs / 9p / v9fs_vfs.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * V9FS VFS extensions.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
 *  Copyright (C) 2002 by Ron Minnich <[email protected]>
 */
#ifndef FS_9P_V9FS_VFS_H
#define FS_9P_V9FS_VFS_H

/* plan9 semantics are that created files are implicitly opened.
 * But linux semantics are that you call create, then open.
 * the plan9 approach is superior as it provides an atomic
 * open.
 * we track the create fid here. When the file is opened, if fidopen is
 * non-zero, we use the fid and can skip some steps.
 * there may be a better way to do this, but I don't know it.
 * one BAD way is to clunk the fid on create, then open it again:
 * you lose the atomicity of file open
 */

/* special case:
 * unlink calls remove, which is an implicit clunk. So we have to track
 * that kind of thing so that we don't try to clunk a dead fid.
 */
#define P9_LOCK_TIMEOUT (30*HZ)

/* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */
#define V9FS_STAT2INODE_KEEP_ISIZE 1

extern struct file_system_type v9fs_fs_type;
extern const struct address_space_operations v9fs_addr_operations;
extern const struct file_operations v9fs_file_operations;
extern const struct file_operations v9fs_file_operations_dotl;
extern const struct file_operations v9fs_dir_operations;
extern const struct file_operations v9fs_dir_operations_dotl;
extern const struct dentry_operations v9fs_dentry_operations;
extern const struct dentry_operations v9fs_cached_dentry_operations;
extern struct kmem_cache *v9fs_inode_cache;

struct inode *v9fs_alloc_inode(struct super_block *sb);
void v9fs_free_inode(struct inode *inode);
struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode,
			     dev_t rdev);
int v9fs_init_inode(struct v9fs_session_info *v9ses,
		    struct inode *inode, umode_t mode, dev_t rdev);
void v9fs_evict_inode(struct inode *inode);
ino_t v9fs_qid2ino(struct p9_qid *qid);
void v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
		      struct super_block *sb, unsigned int flags);
void v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
			   unsigned int flags);
int v9fs_dir_release(struct inode *inode, struct file *filp);
int v9fs_file_open(struct inode *inode, struct file *file);
void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
int v9fs_uflags2omode(int uflags, int extended);

void v9fs_blank_wstat(struct p9_wstat *wstat);
int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
			  struct dentry *dentry, struct iattr *iattr);
int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
			 int datasync);
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode);
int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode);
static inline void v9fs_invalidate_inode_attr(struct inode *inode)
{
	struct v9fs_inode *v9inode;

	v9inode = V9FS_I(inode);
	v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
}

int v9fs_open_to_dotl_flags(int flags);

static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size)
{
	/*
	 * 32-bit need the lock, concurrent updates could break the
	 * sequences and make i_size_read() loop forever.
	 * 64-bit updates are atomic and can skip the locking.
	 */
	if (sizeof(i_size) > sizeof(long))
		spin_lock(&inode->i_lock);
	i_size_write(inode, i_size);
	if (sizeof(i_size) > sizeof(long))
		spin_unlock(&inode->i_lock);
}
#endif
Commit	Line	Data
1f327613	1	/* SPDX-License-Identifier: GPL-2.0-only */
9e82cf6a EVH	2	/*
	3	* V9FS VFS extensions.
	4	*
	5	* Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
	6	* Copyright (C) 2002 by Ron Minnich <[email protected]>
9e82cf6a	7	*/
e0459f57 AK	8	#ifndef FS_9P_V9FS_VFS_H
e0459f57 AK	9	#define FS_9P_V9FS_VFS_H
9e82cf6a EVH	10
	11	/* plan9 semantics are that created files are implicitly opened.
	12	* But linux semantics are that you call create, then open.
	13	* the plan9 approach is superior as it provides an atomic
	14	* open.
	15	* we track the create fid here. When the file is opened, if fidopen is
	16	* non-zero, we use the fid and can skip some steps.
	17	* there may be a better way to do this, but I don't know it.
	18	* one BAD way is to clunk the fid on create, then open it again:
	19	* you lose the atomicity of file open
	20	*/
	21
	22	/* special case:
	23	* unlink calls remove, which is an implicit clunk. So we have to track
	24	* that kind of thing so that we don't try to clunk a dead fid.
	25	*/
e0459f57	26	#define P9_LOCK_TIMEOUT (30*HZ)
9e82cf6a	27
5e3cc1ee HT	28	/* flags for v9fs_stat2inode() & v9fs_stat2inode_dotl() */
	29	#define V9FS_STAT2INODE_KEEP_ISIZE 1
	30
9e82cf6a	31	extern struct file_system_type v9fs_fs_type;
f5e54d6e	32	extern const struct address_space_operations v9fs_addr_operations;
4b6f5d20	33	extern const struct file_operations v9fs_file_operations;
9b6533c9	34	extern const struct file_operations v9fs_file_operations_dotl;
4b6f5d20	35	extern const struct file_operations v9fs_dir_operations;
9b6533c9	36	extern const struct file_operations v9fs_dir_operations_dotl;
a488257c AV	37	extern const struct dentry_operations v9fs_dentry_operations;
a488257c AV	38	extern const struct dentry_operations v9fs_cached_dentry_operations;
a78ce05d	39	extern struct kmem_cache *v9fs_inode_cache;
9e82cf6a	40
60e78d2c	41	struct inode v9fs_alloc_inode(struct super_block sb);
5e8a0770	42	void v9fs_free_inode(struct inode *inode);
6e195b0f DM	43	struct inode v9fs_get_inode(struct super_block sb, umode_t mode,
6e195b0f DM	44	dev_t rdev);
5ffc0cb3	45	int v9fs_init_inode(struct v9fs_session_info *v9ses,
6e195b0f	46	struct inode *inode, umode_t mode, dev_t rdev);
b57922d9	47	void v9fs_evict_inode(struct inode *inode);
bd238fb4	48	ino_t v9fs_qid2ino(struct p9_qid *qid);
5e3cc1ee HT	49	void v9fs_stat2inode(struct p9_wstat stat, struct inode inode,
	50	struct super_block *sb, unsigned int flags);
	51	void v9fs_stat2inode_dotl(struct p9_stat_dotl stat, struct inode inode,
	52	unsigned int flags);
9e82cf6a EVH	53	int v9fs_dir_release(struct inode inode, struct file filp);
9e82cf6a EVH	54	int v9fs_file_open(struct inode inode, struct file file);
51a87c55	55	void v9fs_inode2stat(struct inode inode, struct p9_wstat stat);
2e4bef41	56	int v9fs_uflags2omode(int uflags, int extended);
fbedadc1	57
7a4439c4	58	void v9fs_blank_wstat(struct p9_wstat *wstat);
c1632a0f	59	int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
6e195b0f	60	struct dentry dentry, struct iattr iattr);
02c24a82 JB	61	int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
02c24a82 JB	62	int datasync);
b3cbea03 AK	63	int v9fs_refresh_inode(struct p9_fid fid, struct inode inode);
	64	int v9fs_refresh_inode_dotl(struct p9_fid fid, struct inode inode);
	65	static inline void v9fs_invalidate_inode_attr(struct inode *inode)
	66	{
	67	struct v9fs_inode *v9inode;
6e195b0f	68
b3cbea03 AK	69	v9inode = V9FS_I(inode);
b3cbea03 AK	70	v9inode->cache_validity \|= V9FS_INO_INVALID_ATTR;
b3cbea03	71	}
f88657ce AK	72
f88657ce AK	73	int v9fs_open_to_dotl_flags(int flags);
5e3cc1ee HT	74
	75	static inline void v9fs_i_size_write(struct inode *inode, loff_t i_size)
	76	{
	77	/*
	78	* 32-bit need the lock, concurrent updates could break the
	79	* sequences and make i_size_read() loop forever.
	80	* 64-bit updates are atomic and can skip the locking.
	81	*/
	82	if (sizeof(i_size) > sizeof(long))
	83	spin_lock(&inode->i_lock);
	84	i_size_write(inode, i_size);
	85	if (sizeof(i_size) > sizeof(long))
	86	spin_unlock(&inode->i_lock);
	87	}
e0459f57	88	#endif