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Diffstat (limited to 'fs/9p/fid.c')
-rw-r--r--fs/9p/fid.c176
1 files changed, 95 insertions, 81 deletions
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 821c9c4d76aa..d95f8626d170 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -71,21 +71,28 @@ static int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry)
*
*/
-struct v9fs_fid *v9fs_fid_create(struct dentry *dentry)
+struct v9fs_fid *v9fs_fid_create(struct dentry *dentry,
+ struct v9fs_session_info *v9ses, int fid, int create)
{
struct v9fs_fid *new;
+ dprintk(DEBUG_9P, "fid create dentry %p, fid %d, create %d\n",
+ dentry, fid, create);
+
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->fidcreate = create;
new->fidclunked = 0;
new->iounit = 0;
+ new->rdir_pos = 0;
+ new->rdir_fcall = NULL;
if (v9fs_fid_insert(new, dentry) == 0)
return new;
@@ -109,6 +116,59 @@ void v9fs_fid_destroy(struct v9fs_fid *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;
+ 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;
+ }
+
+ return v9fs_fid_create(dentry, v9ses, fidnum, 0);
+
+clunk_fid:
+ v9fs_t_clunk(v9ses, fidnum, NULL);
+ return ERR_PTR(err);
+}
+
+/**
* v9fs_fid_lookup - retrieve the right fid from a particular dentry
* @dentry: dentry to look for fid in
* @type: intent of lookup (operation or traversal)
@@ -119,49 +179,25 @@ void v9fs_fid_destroy(struct v9fs_fid *fid)
*
*/
-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);
+ dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry);
- if (fid_list && !list_empty(fid_list)) {
+ if (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;
- }
+ if (!current_fid->fidcreate) {
+ return_fid = current_fid;
+ break;
}
}
+
+ if (!return_fid)
+ return_fid = current_fid;
}
/* we are at the root but didn't match */
@@ -187,55 +223,33 @@ struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry, int type)
/* 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 */
+ return_fid = v9fs_fid_walk_up(dentry);
+ if (IS_ERR(return_fid))
+ return_fid = NULL;
+ }
+ }
- fidnum = v9fs_get_idpool(&v9ses->fidpool);
- if (fidnum < 0) {
- dprintk(DEBUG_ERROR,
- "could not get a new fid num\n");
- return return_fid;
- }
+ 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;
+struct v9fs_fid *v9fs_fid_get_created(struct dentry *dentry)
+{
+ struct list_head *fid_list;
+ struct v9fs_fid *fid, *ftmp, *ret;
+
+ dprintk(DEBUG_9P, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+ fid_list = (struct list_head *)dentry->d_fsdata;
+ ret = NULL;
+ if (fid_list) {
+ list_for_each_entry_safe(fid, ftmp, fid_list, list) {
+ if (fid->fidcreate && fid->pid == current->pid) {
+ list_del(&fid->list);
+ ret = fid;
+ break;
}
}
}
- return return_fid;
+ dprintk(DEBUG_9P, "return %p\n", ret);
+ return ret;
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-12 22:33:30 +0000