31 lines
816 B
Markdown
31 lines
816 B
Markdown
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This is a FUSE filesystem that always returns random corrupted data when
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you read back files you write.
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The filesystem will tell the kernel to use its filesystem buffer cache,
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so you won't see the corruption unless you read with `O_DIRECT`, or if
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you tell the kernel to drop its caches.
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Run with:
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```
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mkdir ~/corrupt-fs
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cargo run -- --allow-direct-io ~/corrupt-fs
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```
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If you don't specify `--allow-direct-io`, direct I/O will not be
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supported.
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To test from the cmdline:
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```
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echo "hello world" > ~/corrupt-fs/hello.txt
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cat ~/corrupt-fs/hello.txt # returns good data from fscache
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dd if=~/corrupt-fs/hello.txt iflag=direct # returns bad data
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```
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Limitations:
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* Subdirectories are not supported.
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* `lseek()` modes other than `SEEK_SET` are not supported.
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* There are probably bugs, especially with large files.
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