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TXATTRCREATE: Prepare a fid for setting xattr value on a file system object. size[4] TXATTRCREATE tag[2] fid[4] name[s] attr_size[8] flags[4] size[4] RXATTRWALK tag[2] txattrcreate gets a fid pointing to xattr. This fid can later be used to get set the xattr value. flag value is derived from set Linux setxattr. The manpage says "The flags parameter can be used to refine the semantics of the operation. XATTR_CREATE specifies a pure create, which fails if the named attribute exists already. XATTR_REPLACE specifies a pure replace operation, which fails if the named attribute does not already exist. By default (no flags), the extended attribute will be created if need be, or will simply replace the value if the attribute exists." The actual setxattr operation happens when the fid is clunked. At that point the written byte count and the attr_size specified in TXATTRCREATE should be same otherwise an error will be returned. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* Virtio 9p
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef _FILEOP_H
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#define _FILEOP_H
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/time.h>
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#include <utime.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/vfs.h>
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#define SM_LOCAL_MODE_BITS 0600
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#define SM_LOCAL_DIR_MODE_BITS 0700
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typedef enum
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{
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SM_PASSTHROUGH = 1, /* uid/gid set on fileserver files */
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SM_MAPPED, /* uid/gid part of xattr */
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} SecModel;
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typedef struct FsCred
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{
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uid_t fc_uid;
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gid_t fc_gid;
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mode_t fc_mode;
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dev_t fc_rdev;
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} FsCred;
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typedef struct FsContext
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{
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char *fs_root;
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SecModel fs_sm;
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uid_t uid;
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} FsContext;
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extern void cred_init(FsCred *);
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typedef struct FileOperations
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{
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int (*lstat)(FsContext *, const char *, struct stat *);
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ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
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int (*chmod)(FsContext *, const char *, FsCred *);
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int (*chown)(FsContext *, const char *, FsCred *);
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int (*mknod)(FsContext *, const char *, FsCred *);
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int (*utimensat)(FsContext *, const char *, const struct timespec *);
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int (*remove)(FsContext *, const char *);
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int (*symlink)(FsContext *, const char *, const char *, FsCred *);
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int (*link)(FsContext *, const char *, const char *);
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int (*setuid)(FsContext *, uid_t);
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int (*close)(FsContext *, int);
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int (*closedir)(FsContext *, DIR *);
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DIR *(*opendir)(FsContext *, const char *);
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int (*open)(FsContext *, const char *, int);
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int (*open2)(FsContext *, const char *, int, FsCred *);
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void (*rewinddir)(FsContext *, DIR *);
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off_t (*telldir)(FsContext *, DIR *);
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struct dirent *(*readdir)(FsContext *, DIR *);
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void (*seekdir)(FsContext *, DIR *, off_t);
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ssize_t (*readv)(FsContext *, int, const struct iovec *, int);
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ssize_t (*writev)(FsContext *, int, const struct iovec *, int);
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off_t (*lseek)(FsContext *, int, off_t, int);
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int (*mkdir)(FsContext *, const char *, FsCred *);
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int (*fstat)(FsContext *, int, struct stat *);
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int (*rename)(FsContext *, const char *, const char *);
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int (*truncate)(FsContext *, const char *, off_t);
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int (*fsync)(FsContext *, int);
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int (*statfs)(FsContext *s, const char *path, struct statfs *stbuf);
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ssize_t (*lgetxattr)(FsContext *, const char *,
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const char *, void *, size_t);
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ssize_t (*llistxattr)(FsContext *, const char *, void *, size_t);
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int (*lsetxattr)(FsContext *, const char *,
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const char *, void *, size_t, int);
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void *opaque;
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} FileOperations;
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#endif
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