ccan/ccan/nfs/nfs.h

#ifndef CCAN_NFS_H
#define CCAN_NFS_H
/*
   Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2010
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
 * This is the highlevel interface to access NFS resources using a posix-like interface
 */
#include <sys/types.h>
#include <stdint.h>

typedef uint64_t nfs_off_t;

struct nfs_context;

/*
 * Used for interfacing the async version of the api into an external eventsystem
 */
int nfs_get_fd(struct nfs_context *nfs);
int nfs_which_events(struct nfs_context *nfs);
int nfs_service(struct nfs_context *nfs, int revents);

/*
 * Used if you need different credentials than the default for the current user.
 */
struct AUTH;
void nfs_set_auth(struct nfs_context *nfs, struct AUTH *auth);


/*
 * When an operation failed, this function can extract a detailed error string.
 */
char *nfs_get_error(struct nfs_context *nfs);


/*
 * Callback for all async nfs functions
 */
typedef void (*nfs_cb)(int err, struct nfs_context *nfs, void *data, void *private_data);




/*
 * NFS CONTEXT.
 */
/*
 * Create an NFS context.
 * Function returns
 *  NULL                 : Failed to create a context.
 *  struct nfs_context * : A pointer to an nfs context.
 */
struct nfs_context *nfs_init_context(void);
/*
 * Destroy an nfs context.
 */
void nfs_destroy_context(struct nfs_context *nfs);


/*
 * A libnfs filehandle
 */
struct nfsfh;



/*
 * MOUNT THE EXPORT
 */
/*
 * Async nfs mount.
 * This function will try to connect to the server and mount the export.
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_mount_async(struct nfs_context *nfs, const char *server, const char *export, nfs_cb cb, void *private_data);
/*
 * Sync nfs mount.
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_mount_sync(struct nfs_context *nfs, const char *server, const char *export);




/*
 * STAT()
 */
/*
 * Async stat(<filename>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is struct stat *
 * -errno : An error occurred.
 *          data is the error string.
 */
struct stat;
int nfs_stat_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync stat(<filename>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_stat_sync(struct nfs_context *nfs, const char *path, struct stat *st);


/*
 * FSTAT()
 */
/*
 * Async fstat(nfsfh *)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is struct stat *
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_fstat_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data);
/*
 * Sync fstat(nfsfh *)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_fstat_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, struct stat *st);



/*
 * OPEN()
 */
/*
 * Async open(<filename>)
 *
 * mode is a combination of the flags : O_RDOLNY, O_WRONLY, O_RDWR , O_SYNC
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is a struct *nfsfh;
 *          The nfsfh is close using nfs_close().
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_open_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data);
/*
 * Sync open(<filename>)
 * Function returns
 *      0 : The operation was successful. *nfsfh is filled in.
 * -errno : The command failed.
 */
int nfs_open_sync(struct nfs_context *nfs, const char *path, int mode, struct nfsfh **nfsfh);




/*
 * CLOSE
 */
/*
 * Async close(nfsfh)
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_close_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data);
/*
 * Sync close(nfsfh)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_close_sync(struct nfs_context *nfs, struct nfsfh *nfsfh);


/*
 * PREAD()
 */
/*
 * Async pread()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *    >=0 : Success.
 *          status is numer of bytes read.
 *          data is a pointer to the returned data.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_pread_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, size_t count, nfs_cb cb, void *private_data);
/*
 * Sync pread()
 * Function returns
 *    >=0 : numer of bytes read.
 * -errno : An error occurred.
 */
int nfs_pread_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, size_t count, char *buf);



/*
 * READ()
 */
/*
 * Async read()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *    >=0 : Success.
 *          status is numer of bytes read.
 *          data is a pointer to the returned data.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_read_async(struct nfs_context *nfs, struct nfsfh *nfsfh, size_t count, nfs_cb cb, void *private_data);
/*
 * Sync read()
 * Function returns
 *    >=0 : numer of bytes read.
 * -errno : An error occurred.
 */
int nfs_read_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, size_t count, char *buf);




/*
 * PWRITE()
 */
/*
 * Async pwrite()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *    >=0 : Success.
 *          status is numer of bytes written.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_pwrite_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, size_t count, char *buf, nfs_cb cb, void *private_data);
/*
 * Sync pwrite()
 * Function returns
 *    >=0 : numer of bytes written.
 * -errno : An error occurred.
 */
int nfs_pwrite_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, size_t count, char *buf);


/*
 * WRITE()
 */
/*
 * Async write()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *    >=0 : Success.
 *          status is numer of bytes written.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_write_async(struct nfs_context *nfs, struct nfsfh *nfsfh, size_t count, char *buf, nfs_cb cb, void *private_data);
/*
 * Sync write()
 * Function returns
 *    >=0 : numer of bytes written.
 * -errno : An error occurred.
 */
int nfs_write_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, size_t count, char *buf);


/*
 * LSEEK()
 */
/*
 * Async lseek()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *    >=0 : Success.
 *          data is nfs_off_t * for the current position.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_lseek_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, int whence, nfs_cb cb, void *private_data);
/*
 * Sync lseek()
 * Function returns
 *    >=0 : numer of bytes read.
 * -errno : An error occurred.
 */
int nfs_lseek_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t offset, int whence, nfs_off_t *current_offset);


/*
 * FSYNC()
 */
/*
 * Async fsync()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_fsync_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_cb cb, void *private_data);
/*
 * Sync fsync()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_fsync_sync(struct nfs_context *nfs, struct nfsfh *nfsfh);



/*
 * TRUNCATE()
 */
/*
 * Async truncate()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_truncate_async(struct nfs_context *nfs, const char *path, nfs_off_t length, nfs_cb cb, void *private_data);
/*
 * Sync truncate()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_truncate_sync(struct nfs_context *nfs, const char *path, nfs_off_t length);



/*
 * FTRUNCATE()
 */
/*
 * Async ftruncate()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_ftruncate_async(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t length, nfs_cb cb, void *private_data);
/*
 * Sync ftruncate()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_ftruncate_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, nfs_off_t length);






/*
 * MKDIR()
 */
/*
 * Async mkdir()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_mkdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync mkdir()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_mkdir_sync(struct nfs_context *nfs, const char *path);



/*
 * RMDIR()
 */
/*
 * Async rmdir()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_rmdir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync rmdir()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_rmdir_sync(struct nfs_context *nfs, const char *path);




/*
 * CREAT()
 */
/*
 * Async creat()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is a struct *nfsfh;
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_creat_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data);
/*
 * Sync creat()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_creat_sync(struct nfs_context *nfs, const char *path, int mode, struct nfsfh **nfsfh);





/*
 * UNLINK()
 */
/*
 * Async unlink()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_unlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync unlink()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_unlink_sync(struct nfs_context *nfs, const char *path);




/*
 * OPENDIR()
 */
struct nfsdir;
/*
 * Async opendir()
 *
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When struct nfsdir * is returned, this resource is closed/freed by calling nfs_closedir()
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is struct nfsdir *
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_opendir_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync opendir()
 * Function returns
 *      0 : Success
 * -errno : An error occurred.
 */
int nfs_opendir_sync(struct nfs_context *nfs, const char *path, struct nfsdir **nfsdir);



/*
 * READDIR()
 */
struct nfsdirent  {
       struct nfsdirent *next;
       char *name;
       uint64_t inode;
};
/*
 * nfs_readdir() never blocks, so no special sync/async versions are available
 */
struct nfsdirent *nfs_readdir(struct nfs_context *nfs, struct nfsdir *nfsdir);



/*
 * READDIR()
 */
/*
 * nfs_closedir() never blocks, so no special sync/async versions are available
 */
void nfs_closedir(struct nfs_context *nfs, struct nfsdir *nfsdir);



/*
 * STATVFS()
 */
/*
 * Async statvfs(<dirname>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is struct statvfs *
 * -errno : An error occurred.
 *          data is the error string.
 */
struct statvfs;
int nfs_statvfs_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync statvfs(<dirname>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_statvfs_sync(struct nfs_context *nfs, const char *path, struct statvfs *svfs);


/*
 * READLINK()
 */
/*
 * Async readlink(<name>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is a char *
 *          data is only valid during the callback and is automatically freed when the callback returns.
 * -errno : An error occurred.
 *          data is the error string.
 */
struct statvfs;
int nfs_readlink_async(struct nfs_context *nfs, const char *path, nfs_cb cb, void *private_data);
/*
 * Sync readlink(<name>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_readlink_sync(struct nfs_context *nfs, const char *path, char *buf, int bufsize);



/*
 * CHMOD()
 */
/*
 * Async chmod(<name>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_chmod_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data);
/*
 * Sync chmod(<name>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_chmod_sync(struct nfs_context *nfs, const char *path, int mode);



/*
 * FCHMOD()
 */
/*
 * Async fchmod(<handle>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_fchmod_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode, nfs_cb cb, void *private_data);
/*
 * Sync fchmod(<handle>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_fchmod_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, int mode);



/*
 * CHOWN()
 */
/*
 * Async chown(<name>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_chown_async(struct nfs_context *nfs, const char *path, int uid, int gid, nfs_cb cb, void *private_data);
/*
 * Sync chown(<name>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_chown_sync(struct nfs_context *nfs, const char *path, int uid, int gid);



/*
 * FCHOWN()
 */
/*
 * Async fchown(<handle>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_fchown_async(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid, int gid, nfs_cb cb, void *private_data);
/*
 * Sync fchown(<handle>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_fchown_sync(struct nfs_context *nfs, struct nfsfh *nfsfh, int uid, int gid);




/*
 * UTIMES()
 */
/*
 * Async utimes(<path>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_utimes_async(struct nfs_context *nfs, const char *path, struct timeval *times, nfs_cb cb, void *private_data);
/*
 * Sync utimes(<path>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_utimes_sync(struct nfs_context *nfs, const char *path, struct timeval *times);


/*
 * UTIME()
 */
/*
 * Async utime(<path>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
struct utimbuf;
int nfs_utime_async(struct nfs_context *nfs, const char *path, struct utimbuf *times, nfs_cb cb, void *private_data);
/*
 * Sync utime(<path>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_utime_sync(struct nfs_context *nfs, const char *path, struct utimbuf *times);




/*
 * ACCESS()
 */
/*
 * Async access(<path>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_access_async(struct nfs_context *nfs, const char *path, int mode, nfs_cb cb, void *private_data);
/*
 * Sync access(<path>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_access_sync(struct nfs_context *nfs, const char *path, int mode);




/*
 * SYMLINK()
 */
/*
 * Async symlink(<path>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_symlink_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data);
/*
 * Sync symlink(<path>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_symlink_sync(struct nfs_context *nfs, const char *oldpath, const char *newpath);


/*
 * RENAME()
 */
/*
 * Async rename(<oldpath>, <newpath>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_rename_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data);
/*
 * Sync rename(<oldpath>, <newpath>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_rename_sync(struct nfs_context *nfs, const char *oldpath, const char *newpath);



/*
 * LINK()
 */
/*
 * Async link(<oldpath>, <newpath>)
 * Function returns
 *  0 : The operation was initiated. Once the operation finishes, the callback will be invoked.
 * <0 : An error occurred when trying to set up the operation. The callback will not be invoked.
 *
 * When the callback is invoked, status indicates the result:
 *      0 : Success.
 *          data is NULL
 * -errno : An error occurred.
 *          data is the error string.
 */
int nfs_link_async(struct nfs_context *nfs, const char *oldpath, const char *newpath, nfs_cb cb, void *private_data);
/*
 * Sync link(<oldpath>, <newpath>)
 * Function returns
 *      0 : The operation was successful.
 * -errno : The command failed.
 */
int nfs_link_sync(struct nfs_context *nfs, const char *oldpath, const char *newpath);



//qqq replace later with lseek(cur, 0)
nfs_off_t nfs_get_current_offset(struct nfsfh *nfsfh);
#endif /* CCAN_NFS_H */