[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 const 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;
}

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 = ilookup5(sb, hash, coda_test_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
754661f1	19	static const struct inode_operations coda_symlink_inode_operations = {
1da177e4 LT	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
1da177e4 LT	58	struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
	59	struct coda_vattr * attr)
	60	{
	61	struct inode *inode;
	62	struct coda_inode_info *cii;
	63	unsigned long hash = coda_f2i(fid);
	64
	65	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);
	66
	67	if (!inode)
	68	return ERR_PTR(-ENOMEM);
	69
	70	if (inode->i_state & I_NEW) {
	71	cii = ITOC(inode);
	72	/* we still need to set i_ino for things like stat(2) */
	73	inode->i_ino = hash;
	74	cii->c_mapcount = 0;
	75	unlock_new_inode(inode);
	76	}
	77
	78	/* always replace the attributes, type might have changed */
	79	coda_fill_inode(inode, attr);
	80	return inode;
	81	}
	82
	83	/* this is effectively coda_iget:
	84	- get attributes (might be cached)
	85	- get the inode for the fid using vfs iget
	86	- link the two up if this is needed
	87	- fill in the attributes
	88	*/
	89	int coda_cnode_make(struct inode *inode, struct CodaFid fid, struct super_block *sb)
	90	{
	91	struct coda_vattr attr;
	92	int error;
	93
	94	/* We get inode numbers from Venus -- see venus source */
	95	error = venus_getattr(sb, fid, &attr);
	96	if ( error ) {
	97	*inode = NULL;
	98	return error;
	99	}
	100
	101	*inode = coda_iget(sb, fid, &attr);
	102	if ( IS_ERR(*inode) ) {
	103	printk("coda_cnode_make: coda_iget failed\n");
	104	return PTR_ERR(*inode);
	105	}
	106	return 0;
	107	}
	108
	109
	110	void coda_replace_fid(struct inode inode, struct CodaFid oldfid,
	111	struct CodaFid *newfid)
	112	{
	113	struct coda_inode_info *cii;
	114	unsigned long hash = coda_f2i(newfid);
	115
	116	cii = ITOC(inode);
	117
c5d3237c	118	BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
1da177e4 LT	119
	120	/* replace fid and rehash inode */
	121	/* XXX we probably need to hold some lock here! */
	122	remove_inode_hash(inode);
	123	cii->c_fid = *newfid;
	124	inode->i_ino = hash;
	125	__insert_inode_hash(inode, hash);
	126	}
	127
	128	/* convert a fid to an inode. */
	129	struct inode coda_fid_to_inode(struct CodaFid fid, struct super_block *sb)
	130	{
	131	struct inode *inode;
	132	unsigned long hash = coda_f2i(fid);
	133
	134	if ( !sb ) {
	135	printk("coda_fid_to_inode: no sb!\n");
	136	return NULL;
	137	}
	138
ed31a7dd	139	inode = ilookup5(sb, hash, coda_test_inode, fid);
1da177e4 LT	140	if ( !inode )
	141	return NULL;
	142
	143	/* we should never see newly created inodes because we intentionally
	144	* fail in the initialization callback */
	145	BUG_ON(inode->i_state & I_NEW);
	146
	147	return inode;
	148	}
	149
	150	/* the CONTROL inode is made without asking attributes from Venus */
	151	int coda_cnode_makectl(struct inode *inode, struct super_block sb)
	152	{
	153	int error = -ENOMEM;
	154
	155	*inode = new_inode(sb);
	156	if (*inode) {
	157	(*inode)->i_ino = CTL_INO;
	158	(*inode)->i_op = &coda_ioctl_inode_operations;
	159	(*inode)->i_fop = &coda_ioctl_operations;
	160	(*inode)->i_mode = 0444;
	161	error = 0;
	162	}
	163
	164	return error;
	165	}
	166