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<a href="https://gitlab.rtems.org/joel">Joel Sherrill</a>
<a href="https://gitlab.rtems.org/rtems/programs/gsoc/-/issues/15#note_122596">commented</a>:
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><a href="https://gitlab.rtems.org/gedare" data-reference-type="user" data-user="8" data-container="body" data-placement="top" class="gfm gfm-project_member js-user-link" title="Gedare Bloom" style="color: #0b5cad; background-color: #cbe2f9; border-radius: .25rem; margin-top: 0; padding: 0 2px;">@gedare</a> linked to one of the macros involved above. None of them include BLOCK_SIZE which explains why your search failed. Here's a bit of a roadmap to the code.</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<a href="https://docs.rtems.org/doxygen/main/group__IMFS.html#gae516a81a3c6a2b16c5063c2885be9dc5" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK</a> is the default value</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;"><a href="https://docs.rtems.org/docs/main/c-user/config/filesystem.html#configure-imfs-memfile-bytes-per-block" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK</a></li>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">These are used to set the variable <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>imfs_memfile_bytes_per_block</code> with this code <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/cpukit/include/rtems/confdefs/libio.h?ref_type=heads#L178">confdefs code</a></p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">I see two tests which exercise CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">$ grep -r CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK</span>
<span id="LC2" class="line" lang="plaintext">psxtests/psximfs01/init.c:#define CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK 16</span>
<span id="LC3" class="line" lang="plaintext">psxtests/psximfs02/init.c:#define CONFIGURE_IMFS_MEMFILE_BYTES_PER_BLOCK MEMFILE_BYTES_PER_BLOCK</span></code></pre>
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