[linux.git] / fs / coda / cnode.c

/* cnode related routines for the coda kernel code
   (C) 1996 Peter Braam
   */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/time.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_psdev.h>

static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
{
	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
}

static struct inode_operations coda_symlink_inode_operations = {
	.readlink	= generic_readlink,
	.follow_link	= page_follow_link_light,
	.put_link	= page_put_link,
	.setattr	= coda_setattr,
};

/* cnode.c */
static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
{
        coda_vattr_to_iattr(inode, attr);

        if (S_ISREG(inode->i_mode)) {
                inode->i_op = &coda_file_inode_operations;
                inode->i_fop = &coda_file_operations;
        } else if (S_ISDIR(inode->i_mode)) {
                inode->i_op = &coda_dir_inode_operations;
                inode->i_fop = &coda_dir_operations;
        } else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &coda_symlink_inode_operations;
		inode->i_data.a_ops = &coda_symlink_aops;
		inode->i_mapping = &inode->i_data;
	} else
                init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
}

static int coda_test_inode(struct inode *inode, void *data)
{
	struct CodaFid *fid = (struct CodaFid *)data;
	return coda_fideq(&(ITOC(inode)->c_fid), fid);
}

static int coda_set_inode(struct inode *inode, void *data)
{
	struct CodaFid *fid = (struct CodaFid *)data;
	ITOC(inode)->c_fid = *fid;
	return 0;
}

static int coda_fail_inode(struct inode *inode, void *data)
{
	return -1;
}

struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
			 struct coda_vattr * attr)
{
	struct inode *inode;
	struct coda_inode_info *cii;
	unsigned long hash = coda_f2i(fid);

	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	if (inode->i_state & I_NEW) {
		cii = ITOC(inode);
		/* we still need to set i_ino for things like stat(2) */
		inode->i_ino = hash;
		cii->c_mapcount = 0;
		unlock_new_inode(inode);
	}

	/* always replace the attributes, type might have changed */
	coda_fill_inode(inode, attr);
	return inode;
}

/* this is effectively coda_iget:
   - get attributes (might be cached)
   - get the inode for the fid using vfs iget
   - link the two up if this is needed
   - fill in the attributes
*/
int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
{
        struct coda_vattr attr;
        int error;
        
	/* We get inode numbers from Venus -- see venus source */
	error = venus_getattr(sb, fid, &attr);
	if ( error ) {
	    *inode = NULL;
	    return error;
	} 

	*inode = coda_iget(sb, fid, &attr);
	if ( IS_ERR(*inode) ) {
		printk("coda_cnode_make: coda_iget failed\n");
                return PTR_ERR(*inode);
        }
	return 0;
}


void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 
		      struct CodaFid *newfid)
{
	struct coda_inode_info *cii;
	unsigned long hash = coda_f2i(newfid);
	
	cii = ITOC(inode);

	BUG_ON(!coda_fideq(&cii->c_fid, oldfid));

	/* replace fid and rehash inode */
	/* XXX we probably need to hold some lock here! */
	remove_inode_hash(inode);
	cii->c_fid = *newfid;
	inode->i_ino = hash;
	__insert_inode_hash(inode, hash);
}

/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) 
{
	struct inode *inode;
	unsigned long hash = coda_f2i(fid);

	if ( !sb ) {
		printk("coda_fid_to_inode: no sb!\n");
		return NULL;
	}

	inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
	if ( !inode )
		return NULL;

	/* we should never see newly created inodes because we intentionally
	 * fail in the initialization callback */
	BUG_ON(inode->i_state & I_NEW);

	return inode;
}

/* the CONTROL inode is made without asking attributes from Venus */
int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
{
	int error = -ENOMEM;

	*inode = new_inode(sb);
	if (*inode) {
		(*inode)->i_ino = CTL_INO;
		(*inode)->i_op = &coda_ioctl_inode_operations;
		(*inode)->i_fop = &coda_ioctl_operations;
		(*inode)->i_mode = 0444;
		error = 0;
	}

	return error;
}
Commit	Line	Data
1da177e4 LT	1	/* cnode related routines for the coda kernel code
	2	(C) 1996 Peter Braam
	3	*/
	4
	5	#include <linux/types.h>
	6	#include <linux/string.h>
	7	#include <linux/time.h>
	8
	9	#include <linux/coda.h>
	10	#include <linux/coda_linux.h>
	11	#include <linux/coda_fs_i.h>
	12	#include <linux/coda_psdev.h>
	13
	14	static inline int coda_fideq(struct CodaFid fid1, struct CodaFid fid2)
	15	{
	16	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
	17	}
	18
	19	static struct inode_operations coda_symlink_inode_operations = {
	20	.readlink = generic_readlink,
	21	.follow_link = page_follow_link_light,
	22	.put_link = page_put_link,
	23	.setattr = coda_setattr,
	24	};
	25
	26	/* cnode.c */
	27	static void coda_fill_inode(struct inode inode, struct coda_vattr attr)
	28	{
	29	coda_vattr_to_iattr(inode, attr);
	30
	31	if (S_ISREG(inode->i_mode)) {
	32	inode->i_op = &coda_file_inode_operations;
	33	inode->i_fop = &coda_file_operations;
	34	} else if (S_ISDIR(inode->i_mode)) {
	35	inode->i_op = &coda_dir_inode_operations;
	36	inode->i_fop = &coda_dir_operations;
	37	} else if (S_ISLNK(inode->i_mode)) {
	38	inode->i_op = &coda_symlink_inode_operations;
	39	inode->i_data.a_ops = &coda_symlink_aops;
	40	inode->i_mapping = &inode->i_data;
	41	} else
	42	init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
	43	}
	44
	45	static int coda_test_inode(struct inode inode, void data)
	46	{
	47	struct CodaFid fid = (struct CodaFid )data;
	48	return coda_fideq(&(ITOC(inode)->c_fid), fid);
	49	}
	50
	51	static int coda_set_inode(struct inode inode, void data)
	52	{
	53	struct CodaFid fid = (struct CodaFid )data;
	54	ITOC(inode)->c_fid = *fid;
	55	return 0;
	56	}
	57
	58	static int coda_fail_inode(struct inode inode, void data)
	59	{
	60	return -1;
	61	}
	62
	63	struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
	64	struct coda_vattr * attr)
65	{
66	struct inode *inode;
67	struct coda_inode_info *cii;
68	unsigned long hash = coda_f2i(fid);
69
70	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
71
72	if (!inode)
73	return ERR_PTR(-ENOMEM);
74
75	if (inode->i_state & I_NEW) {
76	cii = ITOC(inode);
77	/* we still need to set i_ino for things like stat(2) */
78	inode->i_ino = hash;
79	cii->c_mapcount = 0;
80	unlock_new_inode(inode);
81	}
82
83	/* always replace the attributes, type might have changed */
84	coda_fill_inode(inode, attr);
85	return inode;
86	}
87
88	/* this is effectively coda_iget:
89	- get attributes (might be cached)
90	- get the inode for the fid using vfs iget
91	- link the two up if this is needed
92	- fill in the attributes
93	*/
94	int coda_cnode_make(struct inode *inode, struct CodaFid fid, struct super_block *sb)
95	{
96	struct coda_vattr attr;
97	int error;
98
99	/* We get inode numbers from Venus -- see venus source */
100	error = venus_getattr(sb, fid, &attr);
101	if ( error ) {
102	*inode = NULL;
103	return error;
104	}
105
106	*inode = coda_iget(sb, fid, &attr);
107	if ( IS_ERR(*inode) ) {
108	printk("coda_cnode_make: coda_iget failed\n");
109	return PTR_ERR(*inode);
110	}
111	return 0;
112	}
113
114
115	void coda_replace_fid(struct inode inode, struct CodaFid oldfid,
116	struct CodaFid *newfid)
117	{
118	struct coda_inode_info *cii;
119	unsigned long hash = coda_f2i(newfid);
120
121	cii = ITOC(inode);
122
c5d3237c	123	BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
1da177e4 LT	124
	125	/* replace fid and rehash inode */
	126	/* XXX we probably need to hold some lock here! */
	127	remove_inode_hash(inode);
	128	cii->c_fid = *newfid;
	129	inode->i_ino = hash;
	130	__insert_inode_hash(inode, hash);
	131	}
	132
	133	/* convert a fid to an inode. */
	134	struct inode coda_fid_to_inode(struct CodaFid fid, struct super_block *sb)
	135	{
	136	struct inode *inode;
	137	unsigned long hash = coda_f2i(fid);
	138
	139	if ( !sb ) {
	140	printk("coda_fid_to_inode: no sb!\n");
	141	return NULL;
	142	}
	143
	144	inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid);
	145	if ( !inode )
	146	return NULL;
	147
	148	/* we should never see newly created inodes because we intentionally
	149	* fail in the initialization callback */
	150	BUG_ON(inode->i_state & I_NEW);
	151
	152	return inode;
	153	}
	154
	155	/* the CONTROL inode is made without asking attributes from Venus */
	156	int coda_cnode_makectl(struct inode *inode, struct super_block sb)
	157	{
	158	int error = -ENOMEM;
	159
	160	*inode = new_inode(sb);
	161	if (*inode) {
	162	(*inode)->i_ino = CTL_INO;
	163	(*inode)->i_op = &coda_ioctl_inode_operations;
	164	(*inode)->i_fop = &coda_ioctl_operations;
	165	(*inode)->i_mode = 0444;
	166	error = 0;
	167	}
	168
	169	return error;
	170	}
	171