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;
}
/* Although we treat Coda file identifiers as immutable, there is one
* special case for files created during a disconnection where they may
* not be globally unique. When an identifier collision is detected we
* first try to flush the cached inode from the kernel and finally
* resort to renaming/rehashing in-place. Userspace remembers both old
* and new values of the identifier to handle any in-flight upcalls.
* The real solution is to use globally unique UUIDs as identifiers, but
* retrofitting the existing userspace code for this is non-trivial. */
void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
struct CodaFid *newfid)
{
struct coda_inode_info *cii = ITOC(inode);
unsigned long hash = coda_f2i(newfid);
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);
}
void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid,
struct CodaFid *newfid)
{
struct coda_inode_info *cii = ITOC(inode);
unsigned long hash = coda_f2i(newfid);
BUG_ON(!coda_fideq(&cii->c_fid, oldfid));
remove_inode_hash(inode);
cii->c_fid = *newfid;
inode->i_ino = hash;
__insert_inode_hash(inode, hash);
}
/* 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_inode_info *cnp;
struct coda_sb_info *sbi= coda_sbp(sb);
struct coda_vattr attr;
int error;
ino_t ino;
ENTRY;
/*
* 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;
}
ino = attr.va_fileid;
*inode = iget(sb, ino);
if ( !*inode ) {
printk("coda_cnode_make: iget failed\n");
return -ENOMEM;
}
cnp = ITOC(*inode);
/* see if we've got it already */
if ( cnp->c_magic != 0 && coda_fideq(fid, &cnp->c_fid)) {
/* replace the attributes, type might have changed */
coda_fill_inode(*inode, &attr);
return 0;
}
/* not fresh: collision */
if ( cnp->c_magic != 0 ) {
printk("coda_cnode_make on initialized inode %ld, old %s new
%s!\n",
(*inode)->i_ino, coda_f2s(&cnp->c_fid), coda_f2s2(fid));
iput(*inode);
return -ENOENT;
}
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;
}
static int coda_test_inode(struct inode *inode, void *data)
{
struct CodaFid *fid = (struct CodaFid *)data;
struct coda_inode_info *cii = ITOC(inode);
return coda_fideq(&cii->c_fid, fid);
}
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_inocmp(struct inode *inode, unsigned long ino, void *opaque)
{
return (coda_fideq((ViceFid *)opaque, &(ITOC(inode)->c_fid)));
}