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authorAndrew Tridgell <tridge@samba.org>2004-10-25 04:24:58 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 13:04:38 -0500
commit5c95896499dd6f72c8fc9be84b0da880571731da (patch)
tree41a9d98474925f5bbf85b96a81214b8cdb82d95f /source4/ntvfs
parentced8ad3d04df4de84c0d88c2a427a1fa35f0c046 (diff)
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r3189: improved the share_conflict() logic (both in terms of readability and
correctness). pvfs now passes the BASE-RENAME test. (This used to be commit 4cf3f65a5c19fdad62a0bdef225b2d9002cf8c8b)
Diffstat (limited to 'source4/ntvfs')
-rw-r--r--source4/ntvfs/common/opendb.c74
-rw-r--r--source4/ntvfs/posix/pvfs_open.c15
-rw-r--r--source4/ntvfs/posix/pvfs_rename.c11
-rw-r--r--source4/ntvfs/posix/pvfs_unlink.c9
4 files changed, 74 insertions, 35 deletions
diff --git a/source4/ntvfs/common/opendb.c b/source4/ntvfs/common/opendb.c
index 5c962fbad0..a3924daf8e 100644
--- a/source4/ntvfs/common/opendb.c
+++ b/source4/ntvfs/common/opendb.c
@@ -145,41 +145,38 @@ struct odb_lock *odb_lock(TALLOC_CTX *mem_ctx,
return lck;
}
-
/*
determine if two odb_entry structures conflict
*/
static BOOL share_conflict(struct odb_entry *e1, struct odb_entry *e2)
{
- uint32_t m1, m2;
-
- m1 = e1->access_mask & (SA_RIGHT_FILE_WRITE_DATA | SA_RIGHT_FILE_READ_DATA);
- m2 = e2->share_access &
- (NTCREATEX_SHARE_ACCESS_WRITE | NTCREATEX_SHARE_ACCESS_READ);
+#define CHECK_MASK(am, sa, right, share) if (((am) & (right)) && !((sa) & (share))) return True
- if ((m1 & m2) != m1) {
- return True;
+ /* if either open involves no read.write or delete access then
+ it can't conflict */
+ if (!(e1->access_mask & (SA_RIGHT_FILE_WRITE_DATA | SA_RIGHT_FILE_READ_DATA | STD_RIGHT_DELETE_ACCESS))) {
+ return False;
+ }
+ if (!(e2->access_mask & (SA_RIGHT_FILE_WRITE_DATA | SA_RIGHT_FILE_READ_DATA | STD_RIGHT_DELETE_ACCESS))) {
+ return False;
}
- m1 = e2->access_mask & (SA_RIGHT_FILE_WRITE_DATA | SA_RIGHT_FILE_READ_DATA);
- m2 = e1->share_access &
- (NTCREATEX_SHARE_ACCESS_WRITE | NTCREATEX_SHARE_ACCESS_READ);
+ /* check the basic share access */
+ CHECK_MASK(e1->access_mask, e2->share_access, SA_RIGHT_FILE_WRITE_DATA, NTCREATEX_SHARE_ACCESS_WRITE);
+ CHECK_MASK(e2->access_mask, e1->share_access, SA_RIGHT_FILE_WRITE_DATA, NTCREATEX_SHARE_ACCESS_WRITE);
- if ((m1 & m2) != m1) {
- return True;
- }
+ CHECK_MASK(e1->access_mask, e2->share_access, SA_RIGHT_FILE_READ_DATA, NTCREATEX_SHARE_ACCESS_READ);
+ CHECK_MASK(e2->access_mask, e1->share_access, SA_RIGHT_FILE_READ_DATA, NTCREATEX_SHARE_ACCESS_READ);
+ CHECK_MASK(e1->access_mask, e2->share_access, STD_RIGHT_DELETE_ACCESS, NTCREATEX_SHARE_ACCESS_DELETE);
+ CHECK_MASK(e2->access_mask, e1->share_access, STD_RIGHT_DELETE_ACCESS, NTCREATEX_SHARE_ACCESS_DELETE);
+
+ /* if a delete is pending then a second open is not allowed */
if ((e1->create_options & NTCREATEX_OPTIONS_DELETE_ON_CLOSE) ||
(e2->create_options & NTCREATEX_OPTIONS_DELETE_ON_CLOSE)) {
return True;
}
- if ((e1->access_mask & STD_RIGHT_DELETE_ACCESS) &&
- !(e2->share_access & NTCREATEX_SHARE_ACCESS_DELETE)) {
- return True;
- }
-
-
return False;
}
@@ -338,20 +335,49 @@ NTSTATUS odb_set_create_options(struct odb_lock *lck,
/*
- determine if a file is open
+ determine if a file can be opened with the given share_access,
+ create_options and access_mask
*/
-BOOL odb_is_open(struct odb_context *odb, DATA_BLOB *key)
+NTSTATUS odb_can_open(struct odb_context *odb, DATA_BLOB *key,
+ uint32_t share_access, uint32_t create_options,
+ uint32_t access_mask)
{
TDB_DATA dbuf;
TDB_DATA kbuf;
+ struct odb_entry *elist;
+ int i, count;
+ struct odb_entry e;
kbuf.dptr = key->data;
kbuf.dsize = key->length;
dbuf = tdb_fetch(odb->w->tdb, kbuf);
if (dbuf.dptr == NULL) {
- return False;
+ return NT_STATUS_OK;
}
+
+ elist = (struct odb_entry *)dbuf.dptr;
+ count = dbuf.dsize / sizeof(struct odb_entry);
+
+ if (count == 0) {
+ free(dbuf.dptr);
+ return NT_STATUS_OK;
+ }
+
+ e.server = odb->server;
+ e.tid = odb->tid;
+ e.fnum = -1;
+ e.share_access = share_access;
+ e.create_options = create_options;
+ e.access_mask = access_mask;
+
+ for (i=0;i<count;i++) {
+ if (share_conflict(elist+i, &e)) {
+ if (dbuf.dptr) free(dbuf.dptr);
+ return NT_STATUS_SHARING_VIOLATION;
+ }
+ }
+
free(dbuf.dptr);
- return True;
+ return NT_STATUS_OK;
}
diff --git a/source4/ntvfs/posix/pvfs_open.c b/source4/ntvfs/posix/pvfs_open.c
index badd18d370..b66b3725db 100644
--- a/source4/ntvfs/posix/pvfs_open.c
+++ b/source4/ntvfs/posix/pvfs_open.c
@@ -723,17 +723,24 @@ NTSTATUS pvfs_change_create_options(struct pvfs_state *pvfs,
/*
- determine if a file is open - used to prevent some operations on open files
+ determine if a file can be deleted, or if it is prevented by an
+ already open file
*/
-BOOL pvfs_is_open(struct pvfs_state *pvfs, struct pvfs_filename *name)
+NTSTATUS pvfs_can_delete(struct pvfs_state *pvfs, struct pvfs_filename *name)
{
NTSTATUS status;
DATA_BLOB key;
status = pvfs_locking_key(name, name, &key);
if (!NT_STATUS_IS_OK(status)) {
- return False;
+ return NT_STATUS_NO_MEMORY;
}
- return odb_is_open(pvfs->odb_context, &key);
+ status = odb_can_open(pvfs->odb_context, &key,
+ NTCREATEX_SHARE_ACCESS_READ |
+ NTCREATEX_SHARE_ACCESS_WRITE |
+ NTCREATEX_SHARE_ACCESS_DELETE,
+ 0, STD_RIGHT_DELETE_ACCESS);
+
+ return status;
}
diff --git a/source4/ntvfs/posix/pvfs_rename.c b/source4/ntvfs/posix/pvfs_rename.c
index 89d6a0da14..6116f6c7bf 100644
--- a/source4/ntvfs/posix/pvfs_rename.c
+++ b/source4/ntvfs/posix/pvfs_rename.c
@@ -48,9 +48,14 @@ NTSTATUS pvfs_rename(struct ntvfs_module_context *ntvfs,
return status;
}
- if (pvfs_is_open(pvfs, name1) ||
- pvfs_is_open(pvfs, name2)) {
- return NT_STATUS_SHARING_VIOLATION;
+ status = pvfs_can_delete(pvfs, name1);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ status = pvfs_can_delete(pvfs, name2);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
}
if (name1->has_wildcard || name2->has_wildcard) {
diff --git a/source4/ntvfs/posix/pvfs_unlink.c b/source4/ntvfs/posix/pvfs_unlink.c
index 5733722ad5..10a27a5de7 100644
--- a/source4/ntvfs/posix/pvfs_unlink.c
+++ b/source4/ntvfs/posix/pvfs_unlink.c
@@ -47,6 +47,11 @@ static NTSTATUS pvfs_unlink_one(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx,
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
+ status = pvfs_can_delete(pvfs, name);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
/* finally try the actual unlink */
if (unlink(name->full_name) == -1) {
status = pvfs_map_errno(pvfs, errno);
@@ -80,10 +85,6 @@ NTSTATUS pvfs_unlink(struct ntvfs_module_context *ntvfs,
return NT_STATUS_OBJECT_NAME_NOT_FOUND;
}
- if (pvfs_is_open(pvfs, name)) {
- return NT_STATUS_SHARING_VIOLATION;
- }
-
dir = talloc_p(req, struct pvfs_dir);
if (dir == NULL) {
return NT_STATUS_NO_MEMORY;