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authorShehjar Tikoo <shehjart@zresearch.com>2009-05-08 15:45:24 +0530
committerAnand V. Avati <avati@amp.gluster.com>2009-05-08 18:11:53 +0530
commitb3f7efe247ad114b6071ba6a2d6816f783d4aa15 (patch)
tree0b45a6244f19a7dfeba568811b69bf4ce351ba21 /libglusterfs/src/glusterfs_fstab.c
parent5f4c102297bae265a7c9a16a86ee032ffbd44830 (diff)
booster: Add fstab parsing support
This commit changes the booster.conf format from a simple custom format to that of the /etc/fstab.c See booster_mount(..) for the mount options supported/required for LD_PRELOADing booster. I'll write a small help doc soon. This commit also brings in fstab parsing code into libglusterfs because Darwin libc only supports reading the hardcoded /etc/fstab. Signed-off-by: Anand V. Avati <avati@amp.gluster.com>
Diffstat (limited to 'libglusterfs/src/glusterfs_fstab.c')
-rw-r--r--libglusterfs/src/glusterfs_fstab.c309
1 files changed, 309 insertions, 0 deletions
diff --git a/libglusterfs/src/glusterfs_fstab.c b/libglusterfs/src/glusterfs_fstab.c
new file mode 100644
index 00000000000..b21197b1d91
--- /dev/null
+++ b/libglusterfs/src/glusterfs_fstab.c
@@ -0,0 +1,309 @@
+/* Utilities for reading/writing fstab, mtab, etc.
+ Copyright (C) 1995-2000, 2001, 2002, 2003, 2006
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <alloca.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <string.h>
+#include <sys/types.h>
+#include "glusterfs_fstab.h"
+#include <stdlib.h>
+
+/* Prepare to begin reading and/or writing mount table entries from the
+ beginning of FILE. MODE is as for `fopen'. */
+glusterfs_fstab_t *
+glusterfs_fstab_init (const char *file, const char *mode)
+{
+ glusterfs_fstab_t *handle = NULL;
+ /* Extend the mode parameter with "c" to disable cancellation in the
+ I/O functions. */
+ size_t modelen = strlen (mode);
+ char newmode[modelen + 2];
+ memcpy (mempcpy (newmode, mode, modelen), "c", 2);
+
+ handle = calloc (1, sizeof (glusterfs_fstab_t));
+ if (!handle)
+ goto out;
+
+ FILE *result = fopen (file, newmode);
+ if (result != NULL) {
+ /* We do the locking ourselves. */
+ __fsetlocking (result, FSETLOCKING_BYCALLER);
+ handle->fp = result;
+ } else {
+ free (handle);
+ handle = NULL;
+ }
+
+out:
+
+ return handle;
+}
+
+int
+glusterfs_fstab_close (glusterfs_fstab_t *h)
+{
+ if (!h)
+ return -1;
+
+ if (h->fp)
+ fclose (h->fp);
+
+ return 0;
+}
+
+/* Since the values in a line are separated by spaces, a name cannot
+ contain a space. Therefore some programs encode spaces in names
+ by the strings "\040". We undo the encoding when reading an entry.
+ The decoding happens in place. */
+static char *
+decode_name (char *buf)
+{
+ char *rp = buf;
+ char *wp = buf;
+
+ do
+ if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '4' && rp[3] == '0')
+ {
+ /* \040 is a SPACE. */
+ *wp++ = ' ';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '1')
+ {
+ /* \011 is a TAB. */
+ *wp++ = '\t';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '0' && rp[2] == '1' && rp[3] == '2')
+ {
+ /* \012 is a NEWLINE. */
+ *wp++ = '\n';
+ rp += 3;
+ }
+ else if (rp[0] == '\\' && rp[1] == '\\')
+ {
+ /* We have to escape \\ to be able to represent all characters. */
+ *wp++ = '\\';
+ rp += 1;
+ }
+ else if (rp[0] == '\\' && rp[1] == '1' && rp[2] == '3' && rp[3] == '4')
+ {
+ /* \134 is also \\. */
+ *wp++ = '\\';
+ rp += 3;
+ }
+ else
+ *wp++ = *rp;
+ while (*rp++ != '\0');
+
+ return buf;
+}
+
+
+/* Read one mount table entry from STREAM. Returns a pointer to storage
+ reused on the next call, or null for EOF or error (use feof/ferror to
+ check). */
+struct glusterfs_mntent *
+__glusterfs_fstab_getent (FILE *stream, struct glusterfs_mntent *mp,
+ char *buffer, int bufsiz)
+{
+ char *cp;
+ char *head;
+
+ flockfile (stream);
+ do
+ {
+ char *end_ptr;
+
+ if (fgets_unlocked (buffer, bufsiz, stream) == NULL)
+ {
+ funlockfile (stream);
+ return NULL;
+ }
+
+ end_ptr = strchr (buffer, '\n');
+ if (end_ptr != NULL) /* chop newline */
+ *end_ptr = '\0';
+ else
+ {
+ /* Not the whole line was read. Do it now but forget it. */
+ char tmp[1024];
+ while (fgets_unlocked (tmp, sizeof tmp, stream) != NULL)
+ if (strchr (tmp, '\n') != NULL)
+ break;
+ }
+
+ head = buffer + strspn (buffer, " \t");
+ /* skip empty lines and comment lines: */
+ }
+ while (head[0] == '\0' || head[0] == '#');
+
+ cp = strsep (&head, " \t");
+ mp->mnt_fsname = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_dir = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_type = cp != NULL ? decode_name (cp) : (char *) "";
+ if (head)
+ head += strspn (head, " \t");
+ cp = strsep (&head, " \t");
+ mp->mnt_opts = cp != NULL ? decode_name (cp) : (char *) "";
+ switch (head ? sscanf (head, " %d %d ", &mp->mnt_freq, &mp->mnt_passno) : 0)
+ {
+ case 0:
+ mp->mnt_freq = 0;
+ case 1:
+ mp->mnt_passno = 0;
+ case 2:
+ break;
+ }
+ funlockfile (stream);
+
+ return mp;
+}
+
+struct glusterfs_mntent *
+glusterfs_fstab_getent (glusterfs_fstab_t *h)
+{
+ if (!h)
+ return NULL;
+
+ if (!h->fp)
+ return NULL;
+
+ return __glusterfs_fstab_getent (h->fp, &h->tmpent, h->buf,
+ GF_MNTENT_BUFSIZE);
+}
+
+/* We have to use an encoding for names if they contain spaces or tabs.
+ To be able to represent all characters we also have to escape the
+ backslash itself. This "function" must be a macro since we use
+ `alloca'. */
+#define encode_name(name) \
+ do { \
+ const char *rp = name; \
+ \
+ while (*rp != '\0') \
+ if (*rp == ' ' || *rp == '\t' || *rp == '\\') \
+ break; \
+ else \
+ ++rp; \
+ \
+ if (*rp != '\0') \
+ { \
+ /* In the worst case the length of the string can increase to \
+ founr times the current length. */ \
+ char *wp; \
+ \
+ rp = name; \
+ name = wp = (char *) alloca (strlen (name) * 4 + 1); \
+ \
+ do \
+ if (*rp == ' ') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '4'; \
+ *wp++ = '0'; \
+ } \
+ else if (*rp == '\t') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '1'; \
+ *wp++ = '1'; \
+ } \
+ else if (*rp == '\n') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '0'; \
+ *wp++ = '1'; \
+ *wp++ = '2'; \
+ } \
+ else if (*rp == '\\') \
+ { \
+ *wp++ = '\\'; \
+ *wp++ = '\\'; \
+ } \
+ else \
+ *wp++ = *rp; \
+ while (*rp++ != '\0'); \
+ } \
+ } while (0)
+
+
+int
+glusterfs_fstab_addent (glusterfs_fstab_t *h,
+ const struct glusterfs_mntent *mnt)
+{
+ struct glusterfs_mntent mntcopy = *mnt;
+ if (!h)
+ return -1;
+
+ if (!h->fp)
+ return -1;
+
+ if (fseek (h->fp, 0, SEEK_END))
+ return -1;
+
+ /* Encode spaces and tabs in the names. */
+ encode_name (mntcopy.mnt_fsname);
+ encode_name (mntcopy.mnt_dir);
+ encode_name (mntcopy.mnt_type);
+ encode_name (mntcopy.mnt_opts);
+
+ return (fprintf (h->fp, "%s %s %s %s %d %d\n",
+ mntcopy.mnt_fsname,
+ mntcopy.mnt_dir,
+ mntcopy.mnt_type,
+ mntcopy.mnt_opts,
+ mntcopy.mnt_freq,
+ mntcopy.mnt_passno)
+ < 0 ? 1 : 0);
+}
+
+
+/* Search MNT->mnt_opts for an option matching OPT.
+ Returns the address of the substring, or null if none found. */
+char *
+glusterfs_fstab_hasoption (const struct glusterfs_mntent *mnt, const char *opt)
+{
+ const size_t optlen = strlen (opt);
+ char *rest = mnt->mnt_opts, *p;
+
+ while ((p = strstr (rest, opt)) != NULL)
+ {
+ if ((p == rest || p[-1] == ',')
+ && (p[optlen] == '\0' || p[optlen] == '=' || p[optlen] == ','))
+ return p;
+
+ rest = strchr (p, ',');
+ if (rest == NULL)
+ break;
+ ++rest;
+ }
+
+ return NULL;
+}