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/* 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>
extern int coda_debug;
extern int coda_print_entry;
inline int coda_fideq(ViceFid *fid1, ViceFid *fid2)
{
if (fid1->Vnode != fid2->Vnode) return 0;
if (fid1->Volume != fid2->Volume) return 0;
if (fid1->Unique != fid2->Unique) return 0;
return 1;
}
inline int coda_isnullfid(ViceFid *fid)
{
if (fid->Vnode || fid->Volume || fid->Unique) return 0;
return 1;
}
static int coda_inocmp(struct inode *inode, unsigned long ino, void *opaque)
{
return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
}
static struct inode_operations coda_symlink_inode_operations = {
readlink: page_readlink,
follow_link: page_follow_link,
setattr: coda_notify_change,
};
/* cnode.c */
static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
{
CDEBUG(D_SUPER, "ino: %ld\n", inode->i_ino);
if (coda_debug & D_SUPER )
print_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, attr->va_rdev);
}
struct inode * coda_iget(struct super_block * sb, ViceFid * fid,
struct coda_vattr * attr)
{
struct inode *inode;
struct coda_inode_info *cii;
ino_t ino = coda_f2i(fid);
inode = iget4(sb, ino, coda_inocmp, fid);
if ( !inode ) {
CDEBUG(D_CNODE, "coda_iget: no inode\n");
return ERR_PTR(-ENOMEM);
}
/* check if the inode is already initialized */
cii = ITOC(inode);
if (coda_isnullfid(&cii->c_fid))
/* new, empty inode found... initializing */
cii->c_fid = *fid;
/* we shouldnt see inode collisions anymore */
if (!coda_fideq(fid, &cii->c_fid)) BUG();
/* 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, ViceFid *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 ) {
CDEBUG(D_CNODE,
"coda_cnode_make: coda_getvattr returned %d for %s.\n",
error, coda_f2s(fid));
*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);
}
CDEBUG(D_DOWNCALL, "Done making inode: ino %ld, count %d with %s\n",
(*inode)->i_ino, atomic_read(&(*inode)->i_count),
coda_f2s(&ITOC(*inode)->c_fid));
return 0;
}
void coda_replace_fid(struct inode *inode, struct ViceFid *oldfid,
struct ViceFid *newfid)
{
struct coda_inode_info *cii;
cii = ITOC(inode);
if (!coda_fideq(&cii->c_fid, oldfid))
BUG();
/* 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 = coda_f2i(newfid);
insert_inode_hash(inode);
}
/* convert a fid to an inode. */
struct inode *coda_fid_to_inode(ViceFid *fid, struct super_block *sb)
{
ino_t nr;
struct inode *inode;
struct coda_inode_info *cii;
if ( !sb ) {
printk("coda_fid_to_inode: no sb!\n");
return NULL;
}
CDEBUG(D_INODE, "%s\n", coda_f2s(fid));
nr = coda_f2i(fid);
inode = iget4(sb, nr, coda_inocmp, fid);
if ( !inode ) {
printk("coda_fid_to_inode: null from iget, sb %p, nr %ld.\n",
sb, (long)nr);
return NULL;
}
cii = ITOC(inode);
/* The inode could already be purged due to memory pressure */
if (coda_isnullfid(&cii->c_fid)) {
inode->i_nlink = 0;
iput(inode);
return NULL;
}
/* we shouldn't see inode collisions anymore */
if ( !coda_fideq(fid, &cii->c_fid) ) BUG();
CDEBUG(D_INODE, "found %ld\n", inode->i_ino);
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 = 0;
*inode = iget(sb, CTL_INO);
if ( *inode ) {
(*inode)->i_op = &coda_ioctl_inode_operations;
(*inode)->i_fop = &coda_ioctl_operations;
(*inode)->i_mode = 0444;
error = 0;
} else {
error = -ENOMEM;
}
return error;
}
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