331b6cc0ea
Improve support for writing to XFS partitions. Work done by: Russell Cattelan <cattelan at xfs dot org>
173 lines
6.6 KiB
C
173 lines
6.6 KiB
C
/*
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* Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ATTR_H__
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#define __XFS_ATTR_H__
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/*
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* xfs_attr.h
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*
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* Large attribute lists are structured around Btrees where all the data
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* elements are in the leaf nodes. Attribute names are hashed into an int,
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* then that int is used as the index into the Btree. Since the hashval
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* of an attribute name may not be unique, we may have duplicate keys.
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* The internal links in the Btree are logical block offsets into the file.
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*
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* Small attribute lists use a different format and are packed as tightly
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* as possible so as to fit into the literal area of the inode.
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*/
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/*========================================================================
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* External interfaces
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*========================================================================*/
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struct cred;
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struct xfs_vnode;
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typedef int (*attrset_t)(struct xfs_vnode *, char *, void *, size_t, int);
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typedef int (*attrget_t)(struct xfs_vnode *, char *, void *, size_t, int);
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typedef int (*attrremove_t)(struct xfs_vnode *, char *, int);
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typedef int (*attrexists_t)(struct xfs_vnode *);
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typedef int (*attrcapable_t)(struct xfs_vnode *, struct cred *);
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typedef struct attrnames {
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char * attr_name;
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unsigned int attr_namelen;
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unsigned int attr_flag;
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attrget_t attr_get;
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attrset_t attr_set;
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attrremove_t attr_remove;
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attrexists_t attr_exists;
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attrcapable_t attr_capable;
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} attrnames_t;
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#define ATTR_NAMECOUNT 4
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extern struct attrnames attr_user;
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extern struct attrnames attr_secure;
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extern struct attrnames attr_system;
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extern struct attrnames attr_trusted;
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extern struct attrnames *attr_namespaces[ATTR_NAMECOUNT];
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extern attrnames_t *attr_lookup_namespace(char *, attrnames_t **, int);
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extern int attr_generic_list(struct xfs_vnode *, void *, size_t, int, ssize_t *);
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#define ATTR_DONTFOLLOW 0x0001 /* -- unused, from IRIX -- */
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#define ATTR_ROOT 0x0002 /* use attrs in root (trusted) namespace */
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#define ATTR_TRUST 0x0004 /* -- unused, from IRIX -- */
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#define ATTR_SECURE 0x0008 /* use attrs in security namespace */
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#define ATTR_CREATE 0x0010 /* pure create: fail if attr already exists */
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#define ATTR_REPLACE 0x0020 /* pure set: fail if attr does not exist */
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#define ATTR_SYSTEM 0x0100 /* use attrs in system (pseudo) namespace */
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#define ATTR_KERNACCESS 0x0400 /* [kernel] iaccess, inode held io-locked */
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#define ATTR_KERNOTIME 0x1000 /* [kernel] don't update inode timestamps */
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#define ATTR_KERNOVAL 0x2000 /* [kernel] get attr size only, not value */
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#define ATTR_KERNAMELS 0x4000 /* [kernel] list attr names (simple list) */
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#define ATTR_KERNORMALS 0x0800 /* [kernel] normal attr list: user+secure */
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#define ATTR_KERNROOTLS 0x8000 /* [kernel] include root in the attr list */
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#define ATTR_KERNFULLS (ATTR_KERNORMALS|ATTR_KERNROOTLS)
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/*
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* The maximum size (into the kernel or returned from the kernel) of an
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* attribute value or the buffer used for an attr_list() call. Larger
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* sizes will result in an ERANGE return code.
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*/
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#define ATTR_MAX_VALUELEN (64*1024) /* max length of a value */
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/*
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* Define how lists of attribute names are returned to the user from
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* the attr_list() call. A large, 32bit aligned, buffer is passed in
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* along with its size. We put an array of offsets at the top that each
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* reference an attrlist_ent_t and pack the attrlist_ent_t's at the bottom.
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*/
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typedef struct attrlist {
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__s32 al_count; /* number of entries in attrlist */
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__s32 al_more; /* T/F: more attrs (do call again) */
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__s32 al_offset[1]; /* byte offsets of attrs [var-sized] */
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} attrlist_t;
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/*
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* Show the interesting info about one attribute. This is what the
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* al_offset[i] entry points to.
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*/
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typedef struct attrlist_ent { /* data from attr_list() */
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__u32 a_valuelen; /* number bytes in value of attr */
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char a_name[1]; /* attr name (NULL terminated) */
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} attrlist_ent_t;
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/*
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* Given a pointer to the (char*) buffer containing the attr_list() result,
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* and an index, return a pointer to the indicated attribute in the buffer.
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*/
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#define ATTR_ENTRY(buffer, index) \
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((attrlist_ent_t *) \
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&((char *)buffer)[ ((attrlist_t *)(buffer))->al_offset[index] ])
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/*
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* Multi-attribute operation vector.
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*/
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typedef struct attr_multiop {
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int am_opcode; /* operation to perform (ATTR_OP_GET, etc.) */
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int am_error; /* [out arg] result of this sub-op (an errno) */
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char *am_attrname; /* attribute name to work with */
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char *am_attrvalue; /* [in/out arg] attribute value (raw bytes) */
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int am_length; /* [in/out arg] length of value */
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int am_flags; /* bitwise OR of attr API flags defined above */
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} attr_multiop_t;
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#define ATTR_OP_GET 1 /* return the indicated attr's value */
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#define ATTR_OP_SET 2 /* set/create the indicated attr/value pair */
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#define ATTR_OP_REMOVE 3 /* remove the indicated attr */
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/*
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* Kernel-internal version of the attrlist cursor.
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*/
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typedef struct attrlist_cursor_kern {
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__u32 hashval; /* hash value of next entry to add */
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__u32 blkno; /* block containing entry (suggestion) */
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__u32 offset; /* offset in list of equal-hashvals */
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__u16 pad1; /* padding to match user-level */
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__u8 pad2; /* padding to match user-level */
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__u8 initted; /* T/F: cursor has been initialized */
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} attrlist_cursor_kern_t;
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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struct xfs_inode;
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struct attrlist_cursor_kern;
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struct xfs_da_args;
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/*
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* Overall external interface routines.
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*/
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int xfs_attr_get(bhv_desc_t *, const char *, char *, int *, int, struct cred *);
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int xfs_attr_set(bhv_desc_t *, const char *, char *, int, int, struct cred *);
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int xfs_attr_remove(bhv_desc_t *, const char *, int, struct cred *);
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int xfs_attr_list(bhv_desc_t *, char *, int, int,
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struct attrlist_cursor_kern *, struct cred *);
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int xfs_attr_inactive(struct xfs_inode *dp);
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int xfs_attr_shortform_getvalue(struct xfs_da_args *);
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int xfs_attr_fetch(struct xfs_inode *, const char *, int,
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char *, int *, int, struct cred *);
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#endif /* __XFS_ATTR_H__ */
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