Mercurial > dovecot > core-2.2

annotate src/lib/ostream-failure-at.c @ 22664:fea53c2725c0

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director: Fix director_max_parallel_moves/kicks type Should be uint, not time.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 09 Nov 2017 12:24:16 +0200
parents 2e2563132d5f
children cb108f786fb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
21390
2e2563132d5f Updated copyright notices to include the year 2017.
Stephan Bosch <stephan.bosch@dovecot.fi>
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1 /* Copyright (c) 2015-2017 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "buffer.h"
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5 #include "ostream-private.h"
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6 #include "ostream-failure-at.h"
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7
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8 struct failure_at_ostream {
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9 struct ostream_private ostream;
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10 char *error_string;
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11 uoff_t failure_offset;
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12 bool failed;
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13 };
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14
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15 static void o_stream_failure_at_destroy(struct iostream_private *stream)
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16 {
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17 struct failure_at_ostream *fstream =
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18 (struct failure_at_ostream *)stream;
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19
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20 i_free(fstream->error_string);
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21 o_stream_unref(&fstream->ostream.parent);
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22 }
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23
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24 static ssize_t
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25 o_stream_failure_at_sendv(struct ostream_private *stream,
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26 const struct const_iovec *iov, unsigned int iov_count)
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27 {
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28 struct failure_at_ostream *fstream =
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29 (struct failure_at_ostream *)stream;
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30 unsigned int i;
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31 struct const_iovec *iov_dup;
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32 unsigned int iov_dup_count;
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33 uoff_t bytes_until_failure, blocking_bytes_count = 0;
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34 ssize_t ret;
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35
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36 if (stream->ostream.blocking) {
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37 /* blocking ostream must return either a full success or a
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38 failure. if the current write would go past failure_offset,
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39 return a failure now before writing anything. */
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40 for (i = 0; i < iov_count; i++)
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41 blocking_bytes_count += iov[i].iov_len;
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42 if (blocking_bytes_count > 0) {
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43 /* if we're exactly at the failure offset after this
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44 write, fail it only on the next write. */
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45 blocking_bytes_count--;
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46 }
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47 }
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48
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49 if (fstream->failure_offset <= stream->ostream.offset + blocking_bytes_count) {
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50 io_stream_set_error(&stream->iostream, "%s",
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51 fstream->error_string);
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52 stream->ostream.stream_errno = errno = EIO;
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53 fstream->failed = TRUE;
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54 return -1;
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55 }
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56 bytes_until_failure = fstream->failure_offset - stream->ostream.offset;
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57
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58 iov_dup = i_new(struct const_iovec, iov_count);
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59 iov_dup_count = iov_count;
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60 for (i = 0; i < iov_count; i++) {
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61 iov_dup[i] = iov[i];
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62 if (iov_dup[i].iov_len >= bytes_until_failure) {
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63 iov_dup[i].iov_len = bytes_until_failure;
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64 iov_dup_count = i+1;
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65 break;
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66 }
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67 }
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68 ret = o_stream_sendv(stream->parent, iov_dup, iov_dup_count);
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69 i_free(iov_dup);
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70
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71 if (ret < 0) {
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72 o_stream_copy_error_from_parent(stream);
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73 return -1;
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74 }
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75 stream->ostream.offset += ret;
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76 return ret;
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77 }
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78
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79 static int
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80 o_stream_failure_at_flush(struct ostream_private *stream)
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81 {
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82 struct failure_at_ostream *fstream =
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83 (struct failure_at_ostream *)stream;
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84
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85 if (fstream->failed) {
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86 io_stream_set_error(&stream->iostream, "%s",
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87 fstream->error_string);
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88 stream->ostream.stream_errno = errno = EIO;
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89 return -1;
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90 }
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91 return o_stream_flush(stream->parent);
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92 }
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93
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94 struct ostream *
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95 o_stream_create_failure_at(struct ostream *output, uoff_t failure_offset,
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96 const char *error_string)
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97 {
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98 struct failure_at_ostream *fstream;
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99
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100 fstream = i_new(struct failure_at_ostream, 1);
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101 fstream->ostream.sendv = o_stream_failure_at_sendv;
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102 fstream->ostream.flush = o_stream_failure_at_flush;
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103 fstream->ostream.iostream.destroy = o_stream_failure_at_destroy;
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104 fstream->failure_offset = failure_offset;
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105 fstream->error_string = i_strdup(error_string);
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106 return o_stream_create(&fstream->ostream, output,
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107 o_stream_get_fd(output));
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108 }
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109
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110 struct ostream *
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111 o_stream_create_failure_at_flush(struct ostream *output, const char *error_string)
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112 {
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113 struct failure_at_ostream *fstream;
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114
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115 fstream = i_new(struct failure_at_ostream, 1);
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116 fstream->ostream.flush = o_stream_failure_at_flush;
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117 fstream->ostream.iostream.destroy = o_stream_failure_at_destroy;
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118 fstream->error_string = i_strdup(error_string);
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
119 fstream->failed = TRUE;
1c7288c054b1 lib: Added o_stream_create_failure_at() to inject EIO at given offset in ostream
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
120 return o_stream_create(&fstream->ostream, output,
1c7288c054b1 lib: Added o_stream_create_failure_at() to inject EIO at given offset in ostream
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
121 o_stream_get_fd(output));
1c7288c054b1 lib: Added o_stream_create_failure_at() to inject EIO at given offset in ostream
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
122 }