mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 08:42:40 +01:00
b989b4a89f
Before, the tag format's type field was limited to 9-bits. This sounds
like a lot, but this field needed to encode up to 256 user-specified
types. This limited the flexibility of the encoded types. As time went
on, more bits in the type field were repurposed for various things,
leaving a rather fragile type field.
Here we make the jump to full 11-bit type fields. This comes at the cost
of a smaller length field, however the use of the length field was
always going to come with a RAM limitation. Rather than putting pressure
on RAM for inline files, the new type field lets us encode a chunk
number, splitting up inline files into multiple updatable units. This
actually pushes the theoretical inline max from 8KiB to 256KiB! (Note
that we only allow a single 1KiB chunk for now, chunky inline files
is just a theoretical future improvement).
Here is the new 32-bit tag format, note that there are multiple levels
of types which break down into more info:
[---- 32 ----]
[1|-- 11 --|-- 10 --|-- 10 --]
^. ^ . ^ ^- entry length
|. | . \------------ file id chunk info
|. \-----.------------------ type info (type3)
\.-----------.------------------ valid bit
[-3-|-- 8 --]
^ ^- chunk info
\------- type info (type1)
Additionally, I've split the CREATE tag into separate SPLICE and NAME
tags. This simplified the new compact logic a bit. For now, littlefs
still follows the rule that a NAME tag precedes any other tags related
to a file, but this can change in the future.
486 lines
14 KiB
Bash
Executable File
486 lines
14 KiB
Bash
Executable File
#!/bin/bash
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set -eu
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echo "=== Allocator tests ==="
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rm -rf blocks
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tests/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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TEST
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SIZE=15000
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lfs_mkdir() {
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_mkdir(&lfs, "$1") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_remove() {
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_remove(&lfs, "$1/eggs") => 0;
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lfs_remove(&lfs, "$1/bacon") => 0;
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lfs_remove(&lfs, "$1/pancakes") => 0;
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lfs_remove(&lfs, "$1") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_alloc_singleproc() {
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tests/test.py << TEST
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const char *names[] = {"bacon", "eggs", "pancakes"};
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lfs_mount(&lfs, &cfg) => 0;
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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sprintf((char*)buffer, "$1/%s", names[n]);
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lfs_file_open(&lfs, &file[n], (char*)buffer,
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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}
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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size = strlen(names[n]);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &file[n], names[n], size) => size;
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}
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}
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for (unsigned n = 0; n < sizeof(names)/sizeof(names[0]); n++) {
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lfs_file_close(&lfs, &file[n]) => 0;
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}
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lfs_unmount(&lfs) => 0;
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TEST
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}
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lfs_alloc_multiproc() {
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for name in bacon eggs pancakes
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do
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file[0], "$1/$name",
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LFS_O_WRONLY | LFS_O_CREAT | LFS_O_APPEND) => 0;
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size = strlen("$name");
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memcpy(buffer, "$name", size);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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done
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}
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lfs_verify() {
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for name in bacon eggs pancakes
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do
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file[0], "$1/$name", LFS_O_RDONLY) => 0;
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size = strlen("$name");
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_read(&lfs, &file[0], buffer, size) => size;
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memcmp(buffer, "$name", size) => 0;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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done
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}
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echo "--- Single-process allocation test ---"
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lfs_mkdir singleproc
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lfs_alloc_singleproc singleproc
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lfs_verify singleproc
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echo "--- Multi-process allocation test ---"
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lfs_mkdir multiproc
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lfs_alloc_multiproc multiproc
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lfs_verify multiproc
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lfs_verify singleproc
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echo "--- Single-process reuse test ---"
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lfs_remove singleproc
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lfs_mkdir singleprocreuse
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lfs_alloc_singleproc singleprocreuse
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lfs_verify singleprocreuse
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lfs_verify multiproc
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echo "--- Multi-process reuse test ---"
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lfs_remove multiproc
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lfs_mkdir multiprocreuse
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lfs_alloc_singleproc multiprocreuse
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lfs_verify multiprocreuse
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lfs_verify singleprocreuse
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echo "--- Cleanup ---"
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lfs_remove multiprocreuse
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lfs_remove singleprocreuse
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echo "--- Exhaustion test ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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size = strlen("exhaustion");
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memcpy(buffer, "exhaustion", size);
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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lfs_file_sync(&lfs, &file[0]) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_ssize_t res;
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while (true) {
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res = lfs_file_write(&lfs, &file[0], buffer, size);
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if (res < 0) {
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break;
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}
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res => size;
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}
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res => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_RDONLY);
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size = strlen("exhaustion");
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lfs_file_size(&lfs, &file[0]) => size;
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lfs_file_read(&lfs, &file[0], buffer, size) => size;
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memcmp(buffer, "exhaustion", size) => 0;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Exhaustion wraparound test ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_file_open(&lfs, &file[0], "padding", LFS_O_WRONLY | LFS_O_CREAT);
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size = strlen("buffering");
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memcpy(buffer, "buffering", size);
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for (int i = 0; i < $SIZE; i++) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_remove(&lfs, "padding") => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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size = strlen("exhaustion");
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memcpy(buffer, "exhaustion", size);
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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lfs_file_sync(&lfs, &file[0]) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_ssize_t res;
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while (true) {
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res = lfs_file_write(&lfs, &file[0], buffer, size);
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if (res < 0) {
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break;
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}
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res => size;
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}
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res => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_RDONLY);
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size = strlen("exhaustion");
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lfs_file_size(&lfs, &file[0]) => size;
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lfs_file_read(&lfs, &file[0], buffer, size) => size;
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memcmp(buffer, "exhaustion", size) => 0;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Dir exhaustion test ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// find out max file size
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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int count = 0;
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int err;
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while (true) {
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err = lfs_file_write(&lfs, &file[0], buffer, size);
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if (err < 0) {
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break;
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}
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count += 1;
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}
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err => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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// see if dir fits with max file size
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count; i++) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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// see if dir fits with > max file size
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count+1; i++) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_mkdir(&lfs, "exhaustiondir") => LFS_ERR_NOSPC;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Chained dir exhaustion test ---"
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// find out max file size
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lfs_mkdir(&lfs, "exhaustiondir") => 0;
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for (int i = 0; i < 10; i++) {
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sprintf((char*)buffer, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_mkdir(&lfs, (char*)buffer) => 0;
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}
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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int count = 0;
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int err;
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while (true) {
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err = lfs_file_write(&lfs, &file[0], buffer, size);
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if (err < 0) {
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break;
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}
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count += 1;
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}
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err => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_remove(&lfs, "exhaustion") => 0;
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lfs_remove(&lfs, "exhaustiondir") => 0;
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for (int i = 0; i < 10; i++) {
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sprintf((char*)buffer, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_remove(&lfs, (char*)buffer) => 0;
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}
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// see that chained dir fails
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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for (int i = 0; i < count+1; i++) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_sync(&lfs, &file[0]) => 0;
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for (int i = 0; i < 10; i++) {
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sprintf((char*)buffer, "dirwithanexhaustivelylongnameforpadding%d", i);
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lfs_mkdir(&lfs, (char*)buffer) => 0;
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}
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lfs_mkdir(&lfs, "exhaustiondir") => LFS_ERR_NOSPC;
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// shorten file to try a second chained dir
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while (true) {
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err = lfs_mkdir(&lfs, "exhaustiondir");
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if (err != LFS_ERR_NOSPC) {
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break;
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}
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lfs_ssize_t filesize = lfs_file_size(&lfs, &file[0]);
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filesize > 0 => true;
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lfs_file_truncate(&lfs, &file[0], filesize - size) => 0;
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lfs_file_sync(&lfs, &file[0]) => 0;
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}
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err => 0;
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lfs_mkdir(&lfs, "exhaustiondir2") => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Split dir test ---"
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rm -rf blocks
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tests/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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TEST
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tests/test.py << TEST
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lfs_mount(&lfs, &cfg) => 0;
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// create one block hole for half a directory
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lfs_file_open(&lfs, &file[0], "bump", LFS_O_WRONLY | LFS_O_CREAT) => 0;
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for (lfs_size_t i = 0; i < cfg.block_size; i += 2) {
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memcpy(&buffer[i], "hi", 2);
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}
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lfs_file_write(&lfs, &file[0], buffer, cfg.block_size) => cfg.block_size;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion", LFS_O_WRONLY | LFS_O_CREAT);
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < (cfg.block_count-4)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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// remount to force reset of lookahead
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// open hole
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lfs_remove(&lfs, "bump") => 0;
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lfs_mkdir(&lfs, "splitdir") => 0;
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lfs_file_open(&lfs, &file[0], "splitdir/bump",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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for (lfs_size_t i = 0; i < cfg.block_size; i += 2) {
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memcpy(&buffer[i], "hi", 2);
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}
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lfs_file_write(&lfs, &file[0], buffer, 2*cfg.block_size) => LFS_ERR_NOSPC;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Outdated lookahead test ---"
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rm -rf blocks
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tests/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// fill completely with two files
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lfs_file_open(&lfs, &file[0], "exhaustion1",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion2",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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// remount to force reset of lookahead
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// rewrite one file
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lfs_file_open(&lfs, &file[0], "exhaustion1",
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LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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lfs_file_sync(&lfs, &file[0]) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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// rewrite second file, this requires lookahead does not
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// use old population
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lfs_file_open(&lfs, &file[0], "exhaustion2",
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LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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lfs_file_sync(&lfs, &file[0]) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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TEST
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echo "--- Outdated lookahead and split dir test ---"
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rm -rf blocks
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tests/test.py << TEST
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// fill completely with two files
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lfs_file_open(&lfs, &file[0], "exhaustion1",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_file_open(&lfs, &file[0], "exhaustion2",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2+1)/2)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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// remount to force reset of lookahead
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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// rewrite one file with a hole of one block
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lfs_file_open(&lfs, &file[0], "exhaustion1",
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LFS_O_WRONLY | LFS_O_TRUNC) => 0;
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lfs_file_sync(&lfs, &file[0]) => 0;
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size = strlen("blahblahblahblah");
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memcpy(buffer, "blahblahblahblah", size);
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for (lfs_size_t i = 0;
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i < ((cfg.block_count-2)/2 - 1)*(cfg.block_size-8);
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i += size) {
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lfs_file_write(&lfs, &file[0], buffer, size) => size;
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}
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lfs_file_close(&lfs, &file[0]) => 0;
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// try to allocate a directory, should fail!
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lfs_mkdir(&lfs, "split") => LFS_ERR_NOSPC;
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// file should not fail
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lfs_file_open(&lfs, &file[0], "notasplit",
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LFS_O_WRONLY | LFS_O_CREAT) => 0;
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lfs_file_write(&lfs, &file[0], "hi", 2) => 2;
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lfs_file_close(&lfs, &file[0]) => 0;
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lfs_unmount(&lfs) => 0;
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TEST
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echo "--- Results ---"
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tests/stats.py
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