libbtrfsutils: add python-devel detection

[platform/upstream/btrfs-progs.git] / props.c

diff --git a/props.c b/props.c
index 12fdc52..e4edba0 100644 (file)
--- a/props.c
+++ b/props.c
@@ -16,70 +16,62 @@
 
 #include <sys/stat.h>
 #include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
 #include <fcntl.h>
 #include <unistd.h>
 
+#include <btrfsutil.h>
+
 #include "ctree.h"
 #include "commands.h"
 #include "utils.h"
 #include "props.h"
 
+#define XATTR_BTRFS_PREFIX     "btrfs."
+#define XATTR_BTRFS_PREFIX_LEN (sizeof(XATTR_BTRFS_PREFIX) - 1)
+
+/*
+ * Defined as synonyms in attr/xattr.h
+ */
+#ifndef ENOATTR
+#define ENOATTR ENODATA
+#endif
+
 static int prop_read_only(enum prop_object_type type,
                          const char *object,
                          const char *name,
                          const char *value)
 {
-       int ret = 0;
-       int fd = -1;
-       u64 flags = 0;
-
-       fd = open(object, O_RDONLY);
-       if (fd < 0) {
-               ret = -errno;
-               fprintf(stderr, "ERROR: open %s failed. %s\n",
-                               object, strerror(-ret));
-               goto out;
-       }
-
-       ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
-       if (ret < 0) {
-               ret = -errno;
-               fprintf(stderr, "ERROR: failed to get flags for %s. %s\n",
-                               object, strerror(-ret));
-               goto out;
-       }
+       enum btrfs_util_error err;
+       bool read_only;
 
-       if (!value) {
-               if (flags & BTRFS_SUBVOL_RDONLY)
-                       fprintf(stdout, "ro=true\n");
-               else
-                       fprintf(stdout, "ro=false\n");
-               ret = 0;
-               goto out;
-       }
+       if (value) {
+               if (!strcmp(value, "true")) {
+                       read_only = true;
+               } else if (!strcmp(value, "false")) {
+                       read_only = false;
+               } else {
+                       error("invalid value for property: %s", value);
+                       return -EINVAL;
+               }
 
-       if (!strcmp(value, "true")) {
-               flags |= BTRFS_SUBVOL_RDONLY;
-       } else if (!strcmp(value, "false")) {
-               flags = flags & ~BTRFS_SUBVOL_RDONLY;
+               err = btrfs_util_set_subvolume_read_only(object, read_only);
+               if (err) {
+                       error_btrfs_util(err);
+                       return -errno;
+               }
        } else {
-               ret = -EINVAL;
-               fprintf(stderr, "ERROR: invalid value for property.\n");
-               goto out;
-       }
+               err = btrfs_util_get_subvolume_read_only(object, &read_only);
+               if (err) {
+                       error_btrfs_util(err);
+                       return -errno;
+               }
 
-       ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
-       if (ret < 0) {
-               ret = -errno;
-               fprintf(stderr, "ERROR: failed to set flags for %s. %s\n",
-                               object, strerror(-ret));
-               goto out;
+               printf("ro=%s\n", read_only ? "true" : "false");
        }
 
-out:
-       if (fd != -1)
-               close(fd);
-       return ret;
+       return 0;
 }
 
 static int prop_label(enum prop_object_type type,
@@ -102,10 +94,85 @@ static int prop_label(enum prop_object_type type,
        return ret;
 }
 
+static int prop_compression(enum prop_object_type type,
+                           const char *object,
+                           const char *name,
+                           const char *value)
+{
+       int ret;
+       ssize_t sret;
+       int fd = -1;
+       DIR *dirstream = NULL;
+       char *buf = NULL;
+       char *xattr_name = NULL;
+       int open_flags = value ? O_RDWR : O_RDONLY;
+
+       fd = open_file_or_dir3(object, &dirstream, open_flags);
+       if (fd == -1) {
+               ret = -errno;
+               error("failed to open %s: %s", object, strerror(-ret));
+               goto out;
+       }
+
+       xattr_name = malloc(XATTR_BTRFS_PREFIX_LEN + strlen(name) + 1);
+       if (!xattr_name) {
+               ret = -ENOMEM;
+               goto out;
+       }
+       memcpy(xattr_name, XATTR_BTRFS_PREFIX, XATTR_BTRFS_PREFIX_LEN);
+       memcpy(xattr_name + XATTR_BTRFS_PREFIX_LEN, name, strlen(name));
+       xattr_name[XATTR_BTRFS_PREFIX_LEN + strlen(name)] = '\0';
+
+       if (value) {
+               if (strcmp(value, "no") == 0 || strcmp(value, "none") == 0)
+                       value = "";
+               sret = fsetxattr(fd, xattr_name, value, strlen(value), 0);
+       } else {
+               sret = fgetxattr(fd, xattr_name, NULL, 0);
+       }
+       if (sret < 0) {
+               ret = -errno;
+               if (ret != -ENOATTR)
+                       error("failed to %s compression for %s: %s",
+                             value ? "set" : "get", object, strerror(-ret));
+               else
+                       ret = 0;
+               goto out;
+       }
+       if (!value) {
+               size_t len = sret;
+
+               buf = malloc(len);
+               if (!buf) {
+                       ret = -ENOMEM;
+                       goto out;
+               }
+               sret = fgetxattr(fd, xattr_name, buf, len);
+               if (sret < 0) {
+                       ret = -errno;
+                       error("failed to get compression for %s: %s",
+                             object, strerror(-ret));
+                       goto out;
+               }
+               fprintf(stdout, "compression=%.*s\n", (int)len, buf);
+       }
+
+       ret = 0;
+out:
+       free(xattr_name);
+       free(buf);
+       if (fd >= 0)
+               close_file_or_dir(fd, dirstream);
+
+       return ret;
+}
+
 const struct prop_handler prop_handlers[] = {
        {"ro", "Set/get read-only flag of subvolume.", 0, prop_object_subvol,
         prop_read_only},
        {"label", "Set/get label of device.", 0,
         prop_object_dev | prop_object_root, prop_label},
-       {0, 0, 0, 0, 0}
+       {"compression", "Set/get compression for a file or directory", 0,
+        prop_object_inode, prop_compression},
+       {NULL, NULL, 0, 0, NULL}
 };