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o Introduce an extended attribute backing file header magic number

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o Introduce an extended attribute backing file header version number
This commit is contained in:
Robert Watson 2000-04-19 20:12:41 +00:00
parent cc7f40abaa
commit 747b0fa36c
2 changed files with 20 additions and 3 deletions
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8
sys/ufs/ufs/extattr.h
View File

@ -32,8 +32,10 @@
#ifndef _UFS_UFS_EXTATTR_H_
#define _UFS_UFS_EXTATTR_H_
#define UFS_EXTATTR_FSROOTSUBDIR ".attributes"
#define UFS_EXTATTR_MAXEXTATTRNAME 33 /* including null */
#define UFS_EXTATTR_MAGIC 0x00b5d5ec
#define UFS_EXTATTR_VERSION 0x00000002
#define UFS_EXTATTR_FSROOTSUBDIR ".attribute"
#define UFS_EXTATTR_MAXEXTATTRNAME 65 /* including null */
#define UFS_EXTATTR_MAXEXTATTRSIZE 1024 /* bytes */
#define UFS_EXTATTR_ATTR_FLAG_INUSE 0x00000001 /* attr has been set */
@ -51,6 +53,8 @@
#define UFS_EXTATTR_CMD_DISABLE 0x00000004
struct ufs_extattr_fileheader {
u_int uef_magic; /* magic number for sanity checking */
u_int uef_version; /* version of attribute file */
u_int uef_size; /* size of attributes, w/o header */
u_int uef_read_perm; /* permissions to read attribute */
u_int uef_write_perm; /* permissions to write attribute */

15
sys/ufs/ufs/ufs_extattr.c
View File

@ -222,7 +222,6 @@ ufs_extattr_enable(struct ufsmount *ump, char *attrname,
sizeof(struct ufs_extattr_fileheader));
attribute->uele_backing_vnode = backing_vnode;
backing_vnode->v_flag |= VSYSTEM;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
@ -249,6 +248,20 @@ ufs_extattr_enable(struct ufsmount *ump, char *attrname,
goto free_exit;
}
if (attribute->uele_fileheader.uef_magic != UFS_EXTATTR_MAGIC) {
printf("ufs_extattr_enable: invalid attribute header magic\n");
error = EINVAL;
goto free_exit;
}
if (attribute->uele_fileheader.uef_version != UFS_EXTATTR_VERSION) {
printf("ufs_extattr_enable: incorrect attribute header "
"version\n");
error = EINVAL;
goto free_exit;
}
backing_vnode->v_flag |= VSYSTEM;
LIST_INSERT_HEAD(&ump->um_extattr.uepm_list, attribute, uele_entries);
return (0);