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Fixed accidental truncate after seek on inline files

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The cause was mistakenly setting file->ctz.size directly instead of
file->pos, which file->ctz.size gets overwritten with later in
lfs_file_flush.

Also added better seek test cases specifically for inline files. This
should also catch most of the inline corner cases related to
lfs_file_size/lfs_file_tell.

Found by ebinans
This commit is contained in:
Christopher Haster
2019-05-28 13:55:03 -05:00
parent a9a61a3e78
commit 614f7b1e68
2 changed files with 59 additions and 1 deletions
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2
lfs.c
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@@ -2548,7 +2548,7 @@ relocate:
}
}
} else {
file->ctz.size = lfs_max(file->pos, file->ctz.size);
file->pos = lfs_max(file->pos, file->ctz.size);
}
// actual file updates

58
tests/test_seek.sh
View File

@@ -357,5 +357,63 @@ tests/test.py << TEST
lfs_unmount(&lfs) => 0;
TEST
echo "--- Inline write and seek ---"
for SIZE in $SMALLSIZE $MEDIUMSIZE $LARGESIZE
do
tests/test.py << TEST
lfs_mount(&lfs, &cfg) => 0;
lfs_file_open(&lfs, &file[0], "hello/tinykitty$SIZE",
LFS_O_RDWR | LFS_O_CREAT) => 0;
int j = 0;
int k = 0;
memcpy(buffer, "abcdefghijklmnopqrstuvwxyz", 26);
for (unsigned i = 0; i < $SIZE; i++) {
lfs_file_write(&lfs, &file[0], &buffer[j++ % 26], 1) => 1;
lfs_file_tell(&lfs, &file[0]) => i+1;
lfs_file_size(&lfs, &file[0]) => i+1;
}
lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => 0;
lfs_file_tell(&lfs, &file[0]) => 0;
lfs_file_size(&lfs, &file[0]) => $SIZE;
for (unsigned i = 0; i < $SIZE; i++) {
uint8_t c;
lfs_file_read(&lfs, &file[0], &c, 1) => 1;
c => buffer[k++ % 26];
}
lfs_file_sync(&lfs, &file[0]) => 0;
lfs_file_tell(&lfs, &file[0]) => $SIZE;
lfs_file_size(&lfs, &file[0]) => $SIZE;
lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => 0;
for (unsigned i = 0; i < $SIZE; i++) {
lfs_file_write(&lfs, &file[0], &buffer[j++ % 26], 1) => 1;
lfs_file_tell(&lfs, &file[0]) => i+1;
lfs_file_size(&lfs, &file[0]) => $SIZE;
lfs_file_sync(&lfs, &file[0]) => 0;
lfs_file_tell(&lfs, &file[0]) => i+1;
lfs_file_size(&lfs, &file[0]) => $SIZE;
}
lfs_file_seek(&lfs, &file[0], 0, LFS_SEEK_SET) => 0;
lfs_file_tell(&lfs, &file[0]) => 0;
lfs_file_size(&lfs, &file[0]) => $SIZE;
for (unsigned i = 0; i < $SIZE; i++) {
uint8_t c;
lfs_file_read(&lfs, &file[0], &c, 1) => 1;
c => buffer[k++ % 26];
}
lfs_file_sync(&lfs, &file[0]) => 0;
lfs_file_tell(&lfs, &file[0]) => $SIZE;
lfs_file_size(&lfs, &file[0]) => $SIZE;
lfs_file_close(&lfs, &file[0]) => 0;
lfs_unmount(&lfs) => 0;
TEST
done
echo "--- Results ---"
tests/stats.py