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authorChristian Ambach <ambi@samba.org>2012-11-05 19:26:57 +0100
committerAndrew Bartlett <abartlet@samba.org>2013-02-04 12:19:30 +0100
commitf1ff845720604fc32788a59ec9a1a128135efe35 (patch)
tree547bc422a2278fbfc7a2587d056624dcceb4ce0b
parentd9075e19ca8c788824208ee1d77ad5861fe778ed (diff)
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s3:vfs_gpfs add a generic vfs_gpfs_getacl function
in contrast to gpfs_getacl_alloc which always puts the ACL on talloc_tos(), this one allows to specify the memory context and if the caller is interested in the raw ACL blob or a structured version Signed-off-by: Christian Ambach <ambi@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
-rw-r--r--source3/modules/vfs_gpfs.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/source3/modules/vfs_gpfs.c b/source3/modules/vfs_gpfs.c
index e2058e1832..c0d6fb2046 100644
--- a/source3/modules/vfs_gpfs.c
+++ b/source3/modules/vfs_gpfs.c
@@ -219,6 +219,79 @@ static void gpfs_dumpacl(int level, struct gpfs_acl *gacl)
}
}
+/*
+ * get the ACL from GPFS, allocated on the specified mem_ctx
+ * internally retries when initial buffer was too small
+ *
+ * caller needs to cast result to either
+ * raw = yes: struct gpfs_opaque_acl
+ * raw = no: struct gpfs_acl
+ *
+ */
+static void *vfs_gpfs_getacl(TALLOC_CTX *mem_ctx,
+ const char *fname,
+ const bool raw,
+ const gpfs_aclType_t type)
+{
+
+ void *aclbuf;
+ size_t size = 512;
+ int ret, flags;
+ unsigned int *len;
+ size_t struct_size;
+
+again:
+
+ aclbuf = talloc_zero_size(mem_ctx, size);
+ if (aclbuf == NULL) {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ if (raw) {
+ struct gpfs_opaque_acl *buf = (struct gpfs_opaque_acl *) aclbuf;
+ buf->acl_type = type;
+ flags = GPFS_GETACL_NATIVE;
+ len = (unsigned int *) &(buf->acl_buffer_len);
+ struct_size = sizeof(struct gpfs_opaque_acl);
+ } else {
+ struct gpfs_acl *buf = (struct gpfs_acl *) aclbuf;
+ buf->acl_type = type;
+ flags = GPFS_GETACL_STRUCT;
+ len = &(buf->acl_len);
+ struct_size = sizeof(struct gpfs_acl);
+ }
+
+ /* set the length of the buffer as input value */
+ *len = size;
+
+ errno = 0;
+ ret = smbd_gpfs_getacl((char *)fname, flags, aclbuf);
+ if ((ret != 0) && (errno == ENOSPC)) {
+ /*
+ * get the size needed to accommodate the complete buffer
+ *
+ * the value returned only applies to the ACL blob in the
+ * struct so make sure to also have headroom for the first
+ * struct members by adding room for the complete struct
+ * (might be a few bytes too much then)
+ */
+ size = *len + struct_size;
+ talloc_free(aclbuf);
+ DEBUG(10, ("Increasing ACL buffer size to %zu\n", size));
+ goto again;
+ }
+
+ if (ret != 0) {
+ DEBUG(5, ("smbd_gpfs_getacl failed with %s\n",
+ strerror(errno)));
+ talloc_free(aclbuf);
+ return NULL;
+ }
+
+ return aclbuf;
+}
+
static struct gpfs_acl *gpfs_getacl_alloc(const char *fname, gpfs_aclType_t type)
{
struct gpfs_acl *acl;