Subversion Repositories HelenOS

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Ignore whitespace Rev 3627 → Rev 3628

/trunk/uspace/srv/fs/fat/fat_ops.c
343,7 → 343,99
 
int fat_link(void *prnt, void *chld, const char *name)
{
return ENOTSUP; /* not supported at the moment */
fat_node_t *parentp = (fat_node_t *)prnt;
fat_node_t *childp = (fat_node_t *)chld;
fat_dentry_t *d;
fat_bs_t *bs;
block_t *b;
int i, j;
uint16_t bps;
unsigned dps;
unsigned blocks;
 
futex_down(&childp->lock);
if (childp->lnkcnt == 1) {
/*
* On FAT, we don't support multiple hard links.
*/
futex_up(&childp->lock);
return EMLINK;
}
assert(childp->lnkcnt == 0);
futex_up(&childp->lock);
 
if (!fat_dentry_name_verify(name)) {
/*
* Attempt to create unsupported name.
*/
return ENOTSUP;
}
 
/*
* Get us an unused parent node's dentry or grow the parent and allocate
* a new one.
*/
futex_down(&parentp->idx->lock);
bs = block_bb_get(parentp->idx->dev_handle);
bps = uint16_t_le2host(bs->bps);
dps = bps / sizeof(fat_dentry_t);
 
blocks = parentp->size / bps;
 
for (i = 0; i < blocks; i++) {
b = fat_block_get(bs, parentp, i, BLOCK_FLAGS_NONE);
for (j = 0; j < dps; j++) {
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_VALID:
/* skipping used and meta entries */
continue;
case FAT_DENTRY_FREE:
case FAT_DENTRY_LAST:
/* found an empty slot */
goto hit;
}
}
block_put(b);
}
/*
* We need to grow the parent in order to create a new unused dentry.
*/
futex_up(&parentp->idx->lock);
return ENOTSUP; /* XXX */
 
hit:
/*
* At this point we only establish the link between the parent and the
* child. The dentry, except of the name and the extension, will remain
* uninitialized until the the corresponding node is synced. Thus the
* valid dentry data is kept in the child node structure.
*/
memset(d, 0, sizeof(fat_dentry_t));
fat_dentry_name_set(d, name);
b->dirty = true; /* need to sync block */
block_put(b);
futex_up(&parentp->idx->lock);
 
futex_down(&childp->idx->lock);
childp->idx->pfc = parentp->firstc;
childp->idx->pdi = i * dps + j;
futex_up(&childp->idx->lock);
 
futex_down(&childp->lock);
childp->lnkcnt = 1;
childp->dirty = true; /* need to sync node */
futex_up(&childp->lock);
 
/*
* Hash in the index structure into the position hash.
*/
fat_idx_hashin(childp->idx);
 
return EOK;
}
 
int fat_unlink(void *prnt, void *chld)
374,6 → 466,7
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
381,7 → 474,7
return NULL;
default:
case FAT_DENTRY_VALID:
dentry_name_canonify(d, name);
fat_dentry_name_get(d, name);
break;
}
if (stricmp(name, component) == 0) {
464,6 → 557,7
d = ((fat_dentry_t *)b->data) + j;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
698,6 → 792,7
d = ((fat_dentry_t *)b->data) + o;
switch (fat_classify_dentry(d)) {
case FAT_DENTRY_SKIP:
case FAT_DENTRY_FREE:
continue;
case FAT_DENTRY_LAST:
block_put(b);
704,7 → 799,7
goto miss;
default:
case FAT_DENTRY_VALID:
dentry_name_canonify(d, name);
fat_dentry_name_get(d, name);
block_put(b);
goto hit;
}