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pvfs_open: add pvfs_can_update_file_size()

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TODO: this is not complete, we need more tests to trigger this

metze
(This used to be commit 66ad1081f2be8a0caa16fb0d614b857a5bde751c)
This commit is contained in:
Stefan Metzmacher 2008-02-23 11:49:39 +01:00
parent 61e17794c3
commit 4eb0fcc517
1 changed files with 62 additions and 0 deletions
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62
source4/ntvfs/posix/pvfs_open.c
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@ -1620,6 +1620,68 @@ NTSTATUS pvfs_can_rename(struct pvfs_state *pvfs,
return status;
}
/*
determine if the file size of a file can be changed,
or if it is prevented by an already open file
*/
NTSTATUS pvfs_can_update_file_size(struct pvfs_state *pvfs,
struct ntvfs_request *req,
struct pvfs_filename *name,
struct odb_lock **lckp)
{
NTSTATUS status;
DATA_BLOB key;
struct odb_lock *lck;
uint32_t share_access;
uint32_t access_mask;
bool break_to_none;
bool delete_on_close;
status = pvfs_locking_key(name, name, &key);
if (!NT_STATUS_IS_OK(status)) {
return NT_STATUS_NO_MEMORY;
}
lck = odb_lock(req, pvfs->odb_context, &key);
if (lck == NULL) {
DEBUG(0,("Unable to lock opendb for can_stat\n"));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
/* TODO: this may needs some more flags */
share_access = NTCREATEX_SHARE_ACCESS_WRITE;
access_mask = 0;
delete_on_close = false;
break_to_none = true;
status = odb_can_open(lck, name->stream_id,
share_access, access_mask, delete_on_close,
0, break_to_none);
/*
* if it's a sharing violation or we got no oplock
* only keep the lock if the caller requested access
* to the lock
*/
if (NT_STATUS_EQUAL(status, NT_STATUS_SHARING_VIOLATION) ||
NT_STATUS_EQUAL(status, NT_STATUS_OPLOCK_NOT_GRANTED)) {
if (lckp) {
*lckp = lck;
} else {
talloc_free(lck);
}
} else if (!NT_STATUS_IS_OK(status)) {
talloc_free(lck);
if (lckp) {
*lckp = NULL;
}
} else if (lckp) {
*lckp = lck;
}
return status;
}
/*
determine if file meta data can be accessed, or if it is prevented by an
already open file