#include "v9fs.h"
#include "9p.h"
#include "v9fs_vfs.h"
-#include "transport.h"
-#include "mux.h"
-#include "conv.h"
#include "fid.h"
/**
*
*/
-static int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
+int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
{
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
dprintk(DEBUG_9P, "fid %d (%p) dentry %s (%p)\n", fid->fid, fid,
*
*/
-struct v9fs_fid *v9fs_fid_create(struct dentry *dentry)
+struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *v9ses, int fid)
{
struct v9fs_fid *new;
+ dprintk(DEBUG_9P, "fid create fid %d\n", fid);
new = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL);
if (new == NULL) {
dprintk(DEBUG_ERROR, "Out of Memory\n");
return ERR_PTR(-ENOMEM);
}
- new->fid = -1;
+ new->fid = fid;
+ new->v9ses = v9ses;
new->fidopen = 0;
- new->fidcreate = 0;
new->fidclunked = 0;
new->iounit = 0;
+ new->rdir_pos = 0;
+ new->rdir_fcall = NULL;
+ INIT_LIST_HEAD(&new->list);
- if (v9fs_fid_insert(new, dentry) == 0)
return new;
- else {
- dprintk(DEBUG_ERROR, "Problems inserting to dentry\n");
- kfree(new);
- return NULL;
- }
}
/**
kfree(fid);
}
+/**
+ * v9fs_fid_walk_up - walks from the process current directory
+ * up to the specified dentry.
+ */
+static struct v9fs_fid *v9fs_fid_walk_up(struct dentry *dentry)
+{
+ int fidnum, cfidnum, err;
+ struct v9fs_fid *cfid, *fid;
+ struct dentry *cde;
+ struct v9fs_session_info *v9ses;
+
+ v9ses = v9fs_inode2v9ses(current->fs->pwd->d_inode);
+ cfid = v9fs_fid_lookup(current->fs->pwd);
+ if (cfid == NULL) {
+ dprintk(DEBUG_ERROR, "process cwd doesn't have a fid\n");
+ return ERR_PTR(-ENOENT);
+ }
+
+ cfidnum = cfid->fid;
+ cde = current->fs->pwd;
+ /* TODO: take advantage of multiwalk */
+
+ fidnum = v9fs_get_idpool(&v9ses->fidpool);
+ if (fidnum < 0) {
+ dprintk(DEBUG_ERROR, "could not get a new fid num\n");
+ err = -ENOENT;
+ goto clunk_fid;
+ }
+
+ while (cde != dentry) {
+ if (cde == cde->d_parent) {
+ dprintk(DEBUG_ERROR, "can't find dentry\n");
+ err = -ENOENT;
+ goto clunk_fid;
+ }
+
+ err = v9fs_t_walk(v9ses, cfidnum, fidnum, "..", NULL);
+ if (err < 0) {
+ dprintk(DEBUG_ERROR, "problem walking to parent\n");
+ goto clunk_fid;
+ }
+
+ cfidnum = fidnum;
+ cde = cde->d_parent;
+ }
+
+ fid = v9fs_fid_create(v9ses, fidnum);
+ if (fid) {
+ err = v9fs_fid_insert(fid, dentry);
+ if (err < 0) {
+ kfree(fid);
+ goto clunk_fid;
+ }
+ }
+
+ return fid;
+
+clunk_fid:
+ v9fs_t_clunk(v9ses, fidnum);
+ return ERR_PTR(err);
+}
+
/**
* v9fs_fid_lookup - retrieve the right fid from a particular dentry
* @dentry: dentry to look for fid in
*
*/
-struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type)
+struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry)
{
struct list_head *fid_list = (struct list_head *)dentry->d_fsdata;
- struct v9fs_fid *current_fid = NULL;
- struct v9fs_fid *temp = NULL;
struct v9fs_fid *return_fid = NULL;
- int found_parent = 0;
- int found_user = 0;
-
- dprintk(DEBUG_9P, " dentry: %s (%p) type %d\n", dentry->d_iname, dentry,
- type);
-
- if (fid_list && !list_empty(fid_list)) {
- list_for_each_entry_safe(current_fid, temp, fid_list, list) {
- if (current_fid->uid == current->uid) {
- if (return_fid == NULL) {
- if ((type == FID_OP)
- || (!current_fid->fidopen)) {
- return_fid = current_fid;
- found_user = 1;
- }
- }
- }
- if (current_fid->pid == current->real_parent->pid) {
- if ((return_fid == NULL) || (found_parent)
- || (found_user)) {
- if ((type == FID_OP)
- || (!current_fid->fidopen)) {
- return_fid = current_fid;
- found_parent = 1;
- found_user = 0;
- }
- }
- }
- if (current_fid->pid == current->pid) {
- if ((type == FID_OP) ||
- (!current_fid->fidopen)) {
- return_fid = current_fid;
- found_parent = 0;
- found_user = 0;
- }
- }
- }
- }
- /* we are at the root but didn't match */
- if ((!return_fid) && (dentry->d_parent == dentry)) {
- /* TODO: clone attach with new uid */
- return_fid = current_fid;
- }
+ dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+ if (fid_list)
+ return_fid = list_entry(fid_list->next, struct v9fs_fid, list);
if (!return_fid) {
struct dentry *par = current->fs->pwd->d_parent;
/* XXX - there may be some duplication we can get rid of */
if (par == dentry) {
- /* we need to fid_lookup the starting point */
- int fidnum = -1;
- int oldfid = -1;
- int result = -1;
- struct v9fs_session_info *v9ses =
- v9fs_inode2v9ses(current->fs->pwd->d_inode);
-
- current_fid =
- v9fs_fid_lookup(current->fs->pwd, FID_WALK);
- if (current_fid == NULL) {
- dprintk(DEBUG_ERROR,
- "process cwd doesn't have a fid\n");
- return return_fid;
- }
- oldfid = current_fid->fid;
- par = current->fs->pwd;
- /* TODO: take advantage of multiwalk */
-
- fidnum = v9fs_get_idpool(&v9ses->fidpool);
- if (fidnum < 0) {
- dprintk(DEBUG_ERROR,
- "could not get a new fid num\n");
- return return_fid;
- }
-
- while (par != dentry) {
- result =
- v9fs_t_walk(v9ses, oldfid, fidnum, "..",
- NULL);
- if (result < 0) {
- dprintk(DEBUG_ERROR,
- "problem walking to parent\n");
-
- break;
- }
- oldfid = fidnum;
- if (par == par->d_parent) {
- dprintk(DEBUG_ERROR,
- "can't find dentry\n");
- break;
- }
- par = par->d_parent;
- }
- if (par == dentry) {
- return_fid = v9fs_fid_create(dentry);
- return_fid->fid = fidnum;
- }
+ return_fid = v9fs_fid_walk_up(dentry);
+ if (IS_ERR(return_fid))
+ return_fid = NULL;
}
}
projects / powerpc.git / blobdiff