GCOV - Varnish Cache


/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006-2011 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Utility functions for stevedores and storage modules
 */

#include "config.h"

#include <sys/stat.h>

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mgt/mgt.h"
#include "common/heritage.h"

#include "storage/storage.h"
#include "vnum.h"
#include "vfil.h"

#ifndef O_LARGEFILE
#define O_LARGEFILE     0
#endif

/*--------------------------------------------------------------------
 * Get a storage file.
 *
 * The fn argument can be an existing file, an existing directory or
 * a nonexistent filename in an existing directory.
 *
 * If a directory is specified, the file will be anonymous (unlinked)
 *
 * Return:
 *       0 if the file was preexisting.
 *       1 if the file was created.
 *       2 if the file is anonymous.
 *
 * Uses ARGV_ERR to exit in case of trouble.
 */

int
STV_GetFile(const char *fn, int *fdp, const char **fnp, const char *ctx)
{
        int fd;
        struct stat st;
        int retval = 1;
        char buf[FILENAME_MAX];

        AN(fn);
        AN(fnp);
        AN(fdp);
        *fnp = NULL;
        *fdp = -1;

        /* try to create a new file of this name */
        VJ_master(JAIL_MASTER_STORAGE);
        fd = open(fn, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE, 0600);
        if (fd >= 0) {
                VJ_fix_fd(fd, JAIL_FIXFD_FILE);
                *fdp = fd;
                *fnp = fn;
                VJ_master(JAIL_MASTER_LOW);
                return (retval);
        }

        if (stat(fn, &st))
                ARGV_ERR(
                    "(%s) \"%s\" does not exist and could not be created\n",
                    ctx, fn);

        if (S_ISDIR(st.st_mode)) {
                bprintf(buf, "%s/varnish.XXXXXX", fn);
                fd = mkstemp(buf);
                if (fd < 0)
                        ARGV_ERR("(%s) \"%s\" mkstemp(%s) failed (%s)\n",
                            ctx, fn, buf, VAS_errtxt(errno));
                AZ(unlink(buf));
                *fnp = strdup(buf);
                AN(*fnp);
                retval = 2;
        } else if (S_ISREG(st.st_mode)) {
                fd = open(fn, O_RDWR | O_LARGEFILE);
                if (fd < 0)
                        ARGV_ERR("(%s) \"%s\" could not open (%s)\n",
                            ctx, fn, VAS_errtxt(errno));
                *fnp = fn;
                retval = 0;
        } else
                ARGV_ERR(
                    "(%s) \"%s\" is neither file nor directory\n", ctx, fn);

        AZ(fstat(fd, &st));
        if (!S_ISREG(st.st_mode))
                ARGV_ERR("(%s) \"%s\" was not a file after opening\n",
                    ctx, fn);

        *fdp = fd;
        VJ_fix_fd(fd, JAIL_FIXFD_FILE);
        VJ_master(JAIL_MASTER_LOW);
        return (retval);
}

/*--------------------------------------------------------------------
 * Decide file size.
 *
 * If the size specification is empty and the file exists with non-zero
 * size, use that, otherwise, interpret the specification.
 *
 * Handle off_t sizes and pointer width limitations.
 */

uintmax_t
STV_FileSize(int fd, const char *size, unsigned *granularity, const char *ctx)
{
        uintmax_t l, fssize;
        unsigned bs;
        const char *q;
        int i;
        off_t o;
        struct stat st;

        AN(granularity);
        AN(ctx);

        AZ(fstat(fd, &st));
        xxxassert(S_ISREG(st.st_mode));

        AZ(VFIL_fsinfo(fd, &bs, &fssize, NULL));
        /* Increase granularity if it is lower than the filesystem block size */
        *granularity = vmax_t(unsigned, *granularity, bs);

        if ((size == NULL || *size == '\0') && st.st_size != 0) {
                /*
                 * We have no size specification, but an existing file,
                 * use its existing size.
                 */
                l = st.st_size;
        } else if (size == NULL || *size == '\0') {
                ARGV_ERR("(%s) no size specified\n",
                    ctx);
        } else {
                AN(size);
                q = VNUM_2bytes(size, &l, 0);

                if (q != NULL)
                        ARGV_ERR("(%s) size \"%s\": %s\n", ctx, size, q);

                if (l < 1024*1024)
                        ARGV_ERR("(%s) size \"%s\": too small, "
                            "did you forget to specify M or G?\n", ctx, size);

                if (l > fssize)
                        ARGV_ERR("(%s) size \"%s\": larger than file system\n",
                            ctx, size);
        }

        /*
         * This trickery wouldn't be necessary if X/Open would
         * just add OFF_MAX to <limits.h>...
         */
        i = 0;
        while (1) {
                o = l;
                if (o == l && o > 0)
                        break;
                l >>= 1;
                i++;
        }
        if (i)
                fprintf(stderr, "WARNING: (%s) file size reduced"
                    " to %ju due to system \"off_t\" limitations\n", ctx, l);

        if (sizeof(void *) == 4 && l > INT32_MAX) { /*lint !e506 !e774 !e845 */
                fprintf(stderr,
                    "NB: Storage size limited to 2GB on 32 bit architecture,\n"
                    "NB: otherwise we could run out of address space.\n"
                );
                l = INT32_MAX;
        }

        /* Round down */
        l -= (l % *granularity);

        return (l);
}

		varnish-cache/bin/varnishd/storage/stevedore_utils.c
0		/*-
1		* Copyright (c) 2006 Verdens Gang AS
2		* Copyright (c) 2006-2011 Varnish Software AS
3		* All rights reserved.
4		*
5		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
6		*
7		* SPDX-License-Identifier: BSD-2-Clause
8		*
9		* Redistribution and use in source and binary forms, with or without
10		* modification, are permitted provided that the following conditions
11		* are met:
12		* 1. Redistributions of source code must retain the above copyright
13		* notice, this list of conditions and the following disclaimer.
14		* 2. Redistributions in binary form must reproduce the above copyright
15		* notice, this list of conditions and the following disclaimer in the
16		* documentation and/or other materials provided with the distribution.
17		*
18		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
22		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28		* SUCH DAMAGE.
29		*
30		* Utility functions for stevedores and storage modules
31		*/
32
33		#include "config.h"
34
35		#include <sys/stat.h>
36
37		#include <fcntl.h>
38		#include <stdio.h>
39		#include <stdlib.h>
40		#include <string.h>
41		#include <unistd.h>
42
43		#include "mgt/mgt.h"
44		#include "common/heritage.h"
45
46		#include "storage/storage.h"
47		#include "vnum.h"
48		#include "vfil.h"
49
50		#ifndef O_LARGEFILE
51		#define O_LARGEFILE 0
52		#endif
53
54		/*--------------------------------------------------------------------
55		* Get a storage file.
56		*
57		* The fn argument can be an existing file, an existing directory or
58		* a nonexistent filename in an existing directory.
59		*
60		* If a directory is specified, the file will be anonymous (unlinked)
61		*
62		* Return:
63		* 0 if the file was preexisting.
64		* 1 if the file was created.
65		* 2 if the file is anonymous.
66		*
67		* Uses ARGV_ERR to exit in case of trouble.
68		*/
69
70		int
71	1760	STV_GetFile(const char fn, int fdp, const char *fnp, const char ctx)
72		{
73		int fd;
74		struct stat st;
75	1760	int retval = 1;
76		char buf[FILENAME_MAX];
77
78	1760	AN(fn);
79	1760	AN(fnp);
80	1760	AN(fdp);
81	1760	*fnp = NULL;
82	1760	*fdp = -1;
83
84		/* try to create a new file of this name */
85	1760	VJ_master(JAIL_MASTER_STORAGE);
86	1760	fd = open(fn, O_RDWR \| O_CREAT \| O_EXCL \| O_LARGEFILE, 0600);
87	1760	if (fd >= 0) {
88	880	VJ_fix_fd(fd, JAIL_FIXFD_FILE);
89	880	*fdp = fd;
90	880	*fnp = fn;
91	880	VJ_master(JAIL_MASTER_LOW);
92	880	return (retval);
93		}
94
95	880	if (stat(fn, &st))
96	0	ARGV_ERR(
97		"(%s) \"%s\" does not exist and could not be created\n",
98		ctx, fn);
99
100	880	if (S_ISDIR(st.st_mode)) {
101	40	bprintf(buf, "%s/varnish.XXXXXX", fn);
102	40	fd = mkstemp(buf);
103	40	if (fd < 0)
104	0	ARGV_ERR("(%s) \"%s\" mkstemp(%s) failed (%s)\n",
105		ctx, fn, buf, VAS_errtxt(errno));
106	40	AZ(unlink(buf));
107	40	*fnp = strdup(buf);
108	40	AN(*fnp);
109	40	retval = 2;
110	880	} else if (S_ISREG(st.st_mode)) {
111	840	fd = open(fn, O_RDWR \| O_LARGEFILE);
112	840	if (fd < 0)
113	0	ARGV_ERR("(%s) \"%s\" could not open (%s)\n",
114		ctx, fn, VAS_errtxt(errno));
115	840	*fnp = fn;
116	840	retval = 0;
117	840	} else
118	0	ARGV_ERR(
119		"(%s) \"%s\" is neither file nor directory\n", ctx, fn);
120
121	880	AZ(fstat(fd, &st));
122	880	if (!S_ISREG(st.st_mode))
123	0	ARGV_ERR("(%s) \"%s\" was not a file after opening\n",
124		ctx, fn);
125
126	880	*fdp = fd;
127	880	VJ_fix_fd(fd, JAIL_FIXFD_FILE);
128	880	VJ_master(JAIL_MASTER_LOW);
129	880	return (retval);
130	1760	}
131
132		/*--------------------------------------------------------------------
133		* Decide file size.
134		*
135		* If the size specification is empty and the file exists with non-zero
136		* size, use that, otherwise, interpret the specification.
137		*
138		* Handle off_t sizes and pointer width limitations.
139		*/
140
141		uintmax_t
142	1760	STV_FileSize(int fd, const char size, unsigned granularity, const char *ctx)
143		{
144		uintmax_t l, fssize;
145		unsigned bs;
146		const char *q;
147		int i;
148		off_t o;
149		struct stat st;
150
151	1760	AN(granularity);
152	1760	AN(ctx);
153
154	1760	AZ(fstat(fd, &st));
155	1760	xxxassert(S_ISREG(st.st_mode));
156
157	1760	AZ(VFIL_fsinfo(fd, &bs, &fssize, NULL));
158		/* Increase granularity if it is lower than the filesystem block size */
159	1760	granularity = vmax_t(unsigned, granularity, bs);
160
161	1760	if ((size == NULL \|\| *size == '\0') && st.st_size != 0) {
162		/*
163		* We have no size specification, but an existing file,
164		* use its existing size.
165		*/
166	0	l = st.st_size;
167	1760	} else if (size == NULL \|\| *size == '\0') {
168	0	ARGV_ERR("(%s) no size specified\n",
169		ctx);
170	0	} else {
171	1760	AN(size);
172	1760	q = VNUM_2bytes(size, &l, 0);
173
174	1760	if (q != NULL)
175	40	ARGV_ERR("(%s) size \"%s\": %s\n", ctx, size, q);
176
177	1720	if (l < 1024*1024)
178	0	ARGV_ERR("(%s) size \"%s\": too small, "
179		"did you forget to specify M or G?\n", ctx, size);
180
181	1720	if (l > fssize)
182	0	ARGV_ERR("(%s) size \"%s\": larger than file system\n",
183		ctx, size);
184		}
185
186		/*
187		* This trickery wouldn't be necessary if X/Open would
188		* just add OFF_MAX to <limits.h>...
189		*/
190	1720	i = 0;
191	1720	while (1) {
192	1720	o = l;
193	1720	if (o == l && o > 0)
194	1720	break;
195	0	l >>= 1;
196	0	i++;
197		}
198	1720	if (i)
199	0	fprintf(stderr, "WARNING: (%s) file size reduced"
200	0	" to %ju due to system \"off_t\" limitations\n", ctx, l);
201
202		if (sizeof(void ) == 4 && l > INT32_MAX) { /lint !e506 !e774 !e845 */
203		fprintf(stderr,
204		"NB: Storage size limited to 2GB on 32 bit architecture,\n"
205		"NB: otherwise we could run out of address space.\n"
206		);
207		l = INT32_MAX;
208		}
209
210		/* Round down */
211	1720	l -= (l % *granularity);
212
213	1720	return (l);
214		}