mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 19:36:44 +07:00
f4947fbce2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
169 lines
4.7 KiB
C
169 lines
4.7 KiB
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_psdev.h>
|
|
#include "coda_linux.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;
|
|
struct coda_inode_info *cii = ITOC(inode);
|
|
return coda_fideq(&cii->c_fid, fid);
|
|
}
|
|
|
|
static int coda_set_inode(struct inode *inode, void *data)
|
|
{
|
|
struct CodaFid *fid = (struct CodaFid *)data;
|
|
struct coda_inode_info *cii = ITOC(inode);
|
|
cii->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;
|
|
/* inode is locked and unique, no need to grab cii->c_lock */
|
|
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
|
|
*/
|
|
struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
|
|
{
|
|
struct coda_vattr attr;
|
|
struct inode *inode;
|
|
int error;
|
|
|
|
/* We get inode numbers from Venus -- see venus source */
|
|
error = venus_getattr(sb, fid, &attr);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
inode = coda_iget(sb, fid, &attr);
|
|
if (IS_ERR(inode))
|
|
printk("coda_cnode_make: coda_iget failed\n");
|
|
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);
|
|
}
|
|
|
|
/* 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 */
|
|
struct inode *coda_cnode_makectl(struct super_block *sb)
|
|
{
|
|
struct inode *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;
|
|
return inode;
|
|
}
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|