mirror of
https://github.com/xen-project/xen.git
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143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <strings.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <pthread.h>
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#include "fsimage_plugin.h"
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#include "fsimage_priv.h"
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static pthread_mutex_t fsi_lock = PTHREAD_MUTEX_INITIALIZER;
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fsi_t *fsi_open_fsimage(const char *path, uint64_t off)
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{
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fsi_t *fsi = NULL;
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int fd;
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int err;
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if ((fd = open(path, O_RDONLY)) == -1)
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goto fail;
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if ((fsi = malloc(sizeof(*fsi))) == NULL)
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goto fail;
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fsi->f_fd = fd;
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fsi->f_off = off;
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fsi->f_data = NULL;
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pthread_mutex_lock(&fsi_lock);
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err = find_plugin(fsi, path);
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pthread_mutex_unlock(&fsi_lock);
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if (err != 0)
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goto fail;
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return (fsi);
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fail:
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err = errno;
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if (fd != -1)
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(void) close(fd);
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free(fsi);
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errno = err;
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return (NULL);
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}
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void fsi_close_fsimage(fsi_t *fsi)
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{
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pthread_mutex_lock(&fsi_lock);
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fsi->f_plugin->fp_ops->fpo_umount(fsi);
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(void) close(fsi->f_fd);
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fsip_fs_free(fsi);
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pthread_mutex_unlock(&fsi_lock);
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}
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int fsi_file_exists(fsi_t *fsi, const char *path)
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{
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fsi_file_t *ffi;
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if ((ffi = fsi_open_file(fsi, path)) == NULL)
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return (0);
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fsi_close_file(ffi);
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return (1);
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}
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fsi_file_t *fsi_open_file(fsi_t *fsi, const char *path)
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{
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fsi_plugin_ops_t *ops;
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fsi_file_t *ffi;
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pthread_mutex_lock(&fsi_lock);
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ops = fsi->f_plugin->fp_ops;
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ffi = ops->fpo_open(fsi, path);
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pthread_mutex_unlock(&fsi_lock);
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return (ffi);
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}
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int fsi_close_file(fsi_file_t *ffi)
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{
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fsi_plugin_ops_t *ops;
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int err;
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pthread_mutex_lock(&fsi_lock);
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ops = ffi->ff_fsi->f_plugin->fp_ops;
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err = ops->fpo_close(ffi);
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pthread_mutex_unlock(&fsi_lock);
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return (err);
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}
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ssize_t fsi_read_file(fsi_file_t *ffi, void *buf, size_t nbytes)
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{
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fsi_plugin_ops_t *ops;
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ssize_t ret;
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pthread_mutex_lock(&fsi_lock);
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ops = ffi->ff_fsi->f_plugin->fp_ops;
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ret = ops->fpo_read(ffi, buf, nbytes);
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pthread_mutex_unlock(&fsi_lock);
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return (ret);
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}
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ssize_t fsi_pread_file(fsi_file_t *ffi, void *buf, size_t nbytes, uint64_t off)
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{
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fsi_plugin_ops_t *ops;
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ssize_t ret;
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pthread_mutex_lock(&fsi_lock);
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ops = ffi->ff_fsi->f_plugin->fp_ops;
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ret = ops->fpo_pread(ffi, buf, nbytes, off);
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pthread_mutex_unlock(&fsi_lock);
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return (ret);
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}
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