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annotate src/lib/nfs-workarounds.c @ 4071:cd3d26cf124a HEAD

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Renamed safe-open.* to nfs-workarounds.*, safe_open() to nfs_safe_open() and added a new global NFS_ESTALE_RETRY_COUNT which everyone uses instead of defining their own.
author Timo Sirainen <tss@iki.fi>
date Sun, 26 Feb 2006 12:15:39 +0200
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children abdef9d86a94
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cd3d26cf124a Renamed safe-open.* to nfs-workarounds.*, safe_open() to nfs_safe_open() and
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1 /* Copyright (c) 2006 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "nfs-workarounds.h"
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5
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6 #include <fcntl.h>
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7 #include <unistd.h>
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8 #include <sys/stat.h>
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9
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10 int nfs_safe_open(const char *path, int flags)
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11 {
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12 const char *dir = NULL;
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13 struct stat st;
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14 unsigned int i;
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15 int fd;
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16
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17 i_assert((flags & O_CREAT) == 0);
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18
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19 t_push();
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20 for (i = 1;; i++) {
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21 fd = open(path, flags);
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22 if (fd != -1 || errno != ESTALE || i == NFS_ESTALE_RETRY_COUNT)
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23 break;
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24
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25 /* ESTALE: Some operating systems may fail with this if they
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26 can't internally revalidating the NFS handle. It may also
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27 happen if the parent directory has been deleted. If the
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28 directory still exists, try reopening the file. */
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29 if (dir == NULL) {
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30 dir = strrchr(path, '/');
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31 if (dir == NULL)
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32 break;
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33 dir = t_strdup_until(path, dir);
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34 }
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35 if (stat(dir, &st) < 0) {
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36 /* maybe it's gone or something else bad happened to
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37 it. in any case we can't open the file, so fail
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38 with the original ESTALE error and let our caller
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39 handle it. */
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40 errno = ESTALE;
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41 break;
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42 }
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43
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44 /* directory still exists, try reopening */
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45 }
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46 t_pop();
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47 return fd;
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48 }