mirror of
https://github.com/freebsd/freebsd-src
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Move macros describing extended attributes in UFS from
<sys/extattr.h> to <ufs/ufs/extattr.h>. Move description of extended attributes in UFS from man9/extattr.9 to man5/fs.5. Note that restore will not compile until <sys/extattr.h> and <ufs/ufs/extattr.h> have been updated. Suggested by: Robert Watson
This commit is contained in:
Kirk McKusick
parent
b77ad8fc3b
commit
a9093e846d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=167259
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@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/extattr.h>
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#include <sys/acl.h>
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#include <ufs/ufs/extattr.h>
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#include <ufs/ufs/dinode.h>
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#include <protocols/dumprestore.h>
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@ -45,8 +45,11 @@
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.Pp
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.In sys/types.h
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.In sys/lock.h
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.In sys/extattr.h
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.In sys/acl.h
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.In ufs/ufs/quota.h
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.In ufs/ufs/inode.h
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.In ufs/ufs/dinode.h
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.In ufs/ufs/extattr.h
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.Sh DESCRIPTION
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The files
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.In fs.h
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@ -385,6 +388,60 @@ text file, and the root.
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An inode is `named' by its device/i-number pair.
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For further information, see the include file
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.In ufs/ufs/inode.h .
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.Pp
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The format of an external attribute is defined by the extattr structure:
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.Bd -literal
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struct extattr {
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int32_t ea_length; /* length of this attribute */
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int8_t ea_namespace; /* name space of this attribute */
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int8_t ea_contentpadlen; /* padding at end of attribute */
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int8_t ea_namelength; /* length of attribute name */
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char ea_name[1]; /* null-terminated attribute name */
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/* extended attribute content follows */
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};
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.Ed
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.Pp
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Several macros are defined to manipulate these structures.
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Each macro takes a pointer to an extattr structure.
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.Bl -tag -width ".Dv EXTATTR_SET_LENGTHS(eap, size)"
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.It Dv EXTATTR_NEXT(eap)
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Returns a pointer to the next extended attribute following
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.Fa eap .
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.It Dv EXTATTR_CONTENT(eap)
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Returns a pointer to the extended attribute content referenced by
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.Fa eap .
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.It Dv EXTATTR_CONTENT_SIZE(eap)
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Returns the size of the extended attribute content referenced by
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.Fa eap .
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.It Dv EXTATTR_SET_LENGTHS(eap, size)
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Called with the size of the attribute content after initializing
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the attribute name to calculate and set the
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.Fa ea_length ,
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.Fa ea_namelength ,
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and
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.Fa ea_contentpadlen
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fields of the extended attribute structure.
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.El
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.Pp
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The following code identifies an ACL:
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.Bd -literal
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if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
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!strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME) {
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aclp = EXTATTR_CONTENT(eap);
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acllen = EXTATTR_CONTENT_SIZE(eap);
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...
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}
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.Ed
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.Pp
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The following code creates an extended attribute
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containing a copy of a structure
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.Fa mygif :
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.Bd -literal
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eap->ea_namespace = EXTATTR_NAMESPACE_USER;
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strcpy(eap->ea_name, "filepic.gif");
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EXTATTR_SET_LENGTHS(eap, sizeof(struct mygif));
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memcpy(EXTATTR_CONTENT(eap), &mygif, sizeof(struct mygif));
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.Ed
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.Sh HISTORY
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A super-block structure named filsys appeared in
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.At v6 .
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@ -78,61 +78,6 @@ Appropriate vnode extended attribute calls are:
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.Xr VOP_LISTEXTATTR 9 ,
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and
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.Xr VOP_SETEXTATTR 9 .
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.Pp
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The format of an external attribute is defined by the extattr structure:
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.Bd -literal
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struct extattr {
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int32_t ea_length; /* length of this attribute */
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int8_t ea_namespace; /* name space of this attribute */
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int8_t ea_contentpadlen; /* padding at end of attribute */
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int8_t ea_namelength; /* length of attribute name */
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char ea_name[1]; /* null-terminated attribute name */
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/* extended attribute content follows */
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};
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.Ed
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.Pp
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Several macros are defined to manipulate these structures.
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Each macro takes a pointer to an extattr structure.
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.Bl -tag -width ".Dv EXTATTR_SET_LENGTHS(eap, size)"
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.It Dv EXTATTR_NEXT(eap)
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Returns a pointer to the next extended attribute following
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.Fa eap .
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.It Dv EXTATTR_CONTENT(eap)
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Returns a pointer to the extended attribute content referenced by
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.Fa eap .
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.It Dv EXTATTR_CONTENT_SIZE(eap)
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Returns the size of the extended attribute content referenced by
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.Fa eap .
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.It Dv EXTATTR_SET_LENGTHS(eap, size)
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Called with the size of the attribute content after initializing
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the attribute name to calculate and set the
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.Fa ea_length ,
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.Fa ea_namelength ,
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and
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.Fa ea_contentpadlen
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fields of the extended attribute structure.
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.El
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.Pp
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The following code identifies an ACL:
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.Bd -literal
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if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
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!strcmp(eap->ea_name, POSIX1E_ACL_ACCESS_EXTATTR_NAME) {
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aclp = EXTATTR_CONTENT(eap);
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acllen = EXTATTR_CONTENT_SIZE(eap);
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...
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}
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.Ed
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.Pp
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The following code creates an extended attribute
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containing a copy of a structure
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.Fa mygif :
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.Bd -literal
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eap->ea_namespace = EXTATTR_NAMESPACE_USER;
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strcpy(eap->ea_name, "filepic.gif");
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EXTATTR_SET_LENGTHS(eap, sizeof(struct mygif));
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memcpy(EXTATTR_CONTENT(eap), &mygif, sizeof(struct mygif));
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.Ed
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.Pp
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.Sh SEE ALSO
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.Xr VFS 9 ,
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.Xr VFS_EXTATTRCTL 9 ,
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@ -56,48 +56,6 @@
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EXTATTR_NAMESPACE_USER_STRING, \
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EXTATTR_NAMESPACE_SYSTEM_STRING }
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/*
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* This structure defines the required fields of an extended-attribute header.
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*/
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struct extattr {
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int32_t ea_length; /* length of this attribute */
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int8_t ea_namespace; /* name space of this attribute */
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int8_t ea_contentpadlen; /* bytes of padding at end of attribute */
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int8_t ea_namelength; /* length of attribute name */
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char ea_name[1]; /* null-terminated attribute name */
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/* extended attribute content follows */
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};
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/*
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* These macros are used to access and manipulate an extended attribute:
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*
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* EXTATTR_NEXT(eap) returns a pointer to the next extended attribute
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* following eap.
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* EXTATTR_CONTENT(eap) returns a pointer to the extended attribute
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* content referenced by eap.
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* EXTATTR_CONTENT_SIZE(eap) returns the size of the extended attribute
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* content referenced by eap.
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* EXTATTR_SET_LENGTHS(eap, contentsize) called after initializing the
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* attribute name to calculate and set the ea_length, ea_namelength,
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* and ea_contentpadlen fields of the extended attribute structure.
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*/
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#define EXTATTR_NEXT(eap) \
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((struct extattr *)(((void *)(eap)) + (eap)->ea_length))
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#define EXTATTR_CONTENT(eap) (((void *)(eap)) + EXTATTR_BASE_LENGTH(eap))
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#define EXTATTR_CONTENT_SIZE(eap) \
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((eap)->ea_length - EXTATTR_BASE_LENGTH(eap) - (eap)->ea_contentpadlen)
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#define EXTATTR_BASE_LENGTH(eap) \
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((sizeof(struct extattr) + (eap)->ea_namelength + 7) & ~7)
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#define EXTATTR_SET_LENGTHS(eap, contentsize) do { \
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KASSERT(((eap)->ea_name[0] != 0), \
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("Must initialize name before setting lengths")); \
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(eap)->ea_namelength = strlen((eap)->ea_name); \
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(eap)->ea_contentpadlen = ((contentsize) % 8) ? \
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8 - ((contentsize) % 8) : 0; \
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(eap)->ea_length = EXTATTR_BASE_LENGTH(eap) + \
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(contentsize) + (eap)->ea_contentpadlen; \
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} while (0)
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#ifdef _KERNEL
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#define EXTATTR_MAXNAMELEN NAME_MAX
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@ -110,11 +68,6 @@ int extattr_check_cred(struct vnode *vp, int attrnamespace,
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#else
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#include <sys/cdefs.h>
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/* User-level definition of KASSERT for macros above */
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#define KASSERT(cond, str) do { \
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if (!(cond)) { printf("panic: "); printf(str); printf("\n"); exit(1); }\
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} while (0)
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struct iovec;
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__BEGIN_DECLS
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@ -69,6 +69,48 @@ struct ufs_extattr_header {
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/* data follows the header */
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};
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/*
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* This structure defines the required fields of an extended-attribute header.
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*/
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struct extattr {
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int32_t ea_length; /* length of this attribute */
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int8_t ea_namespace; /* name space of this attribute */
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int8_t ea_contentpadlen; /* bytes of padding at end of attribute */
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int8_t ea_namelength; /* length of attribute name */
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char ea_name[1]; /* null-terminated attribute name */
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/* extended attribute content follows */
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};
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/*
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* These macros are used to access and manipulate an extended attribute:
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*
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* EXTATTR_NEXT(eap) returns a pointer to the next extended attribute
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* following eap.
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* EXTATTR_CONTENT(eap) returns a pointer to the extended attribute
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* content referenced by eap.
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* EXTATTR_CONTENT_SIZE(eap) returns the size of the extended attribute
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* content referenced by eap.
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* EXTATTR_SET_LENGTHS(eap, contentsize) called after initializing the
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* attribute name to calculate and set the ea_length, ea_namelength,
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* and ea_contentpadlen fields of the extended attribute structure.
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*/
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#define EXTATTR_NEXT(eap) \
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((struct extattr *)(((void *)(eap)) + (eap)->ea_length))
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#define EXTATTR_CONTENT(eap) (((void *)(eap)) + EXTATTR_BASE_LENGTH(eap))
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#define EXTATTR_CONTENT_SIZE(eap) \
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((eap)->ea_length - EXTATTR_BASE_LENGTH(eap) - (eap)->ea_contentpadlen)
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#define EXTATTR_BASE_LENGTH(eap) \
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((sizeof(struct extattr) + (eap)->ea_namelength + 7) & ~7)
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#define EXTATTR_SET_LENGTHS(eap, contentsize) do { \
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KASSERT(((eap)->ea_name[0] != 0), \
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("Must initialize name before setting lengths")); \
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(eap)->ea_namelength = strlen((eap)->ea_name); \
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(eap)->ea_contentpadlen = ((contentsize) % 8) ? \
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8 - ((contentsize) % 8) : 0; \
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(eap)->ea_length = EXTATTR_BASE_LENGTH(eap) + \
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(contentsize) + (eap)->ea_contentpadlen; \
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} while (0)
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#ifdef _KERNEL
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#ifdef MALLOC_DECLARE
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@ -106,6 +148,13 @@ int ufs_deleteextattr(struct vop_deleteextattr_args *ap);
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int ufs_setextattr(struct vop_setextattr_args *ap);
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void ufs_extattr_vnode_inactive(struct vnode *vp, struct thread *td);
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#else
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/* User-level definition of KASSERT for macros above */
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#define KASSERT(cond, str) do { \
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if (!(cond)) { printf("panic: "); printf(str); printf("\n"); exit(1); }\
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} while (0)
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#endif /* !_KERNEL */
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#endif /* !_UFS_UFS_EXTATTR_H_ */
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