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In response to the discussion of the xfstests mailing list [1],
I looked at the Lseek implementation, which was naive and
did not handle all cases correctly.
The new implementation aligns the returned values to 4096 bytes
as most callers expect.
A lot of tests are added to verify that we handle all
cases correctly now.
[1]: https://www.spinics.net/lists/fstests/msg16554.html
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Rename the symbols and the files.
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All the functionality in these files has been reimplemented
for the v2 api. Drop the old files.
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We need
https://github.com/hanwen/go-fuse/commit/fd7328faf9fdf75709f7ba7df7072aaf4eeb18b3
to fix a crash reported in https://github.com/rfjakob/gocryptfs/issues/430 :
2019/10/30 17:14:16 Unknown opcode 2016
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x508d38]
This patch is only in the v2.x.x branch. Upgrade to v2, as the
old API is also supported there.
Running
git grep hanwen/go-fuse | grep -v hanwen/go-fuse/v2
to check for forgotten references comes back clean.
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Fixes https://github.com/rfjakob/gocryptfs/issues/304
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xfstests generic/083 fills the filesystem almost completely while
running fsstress in parallel. In fsck, these would show up:
readFileID 2580: incomplete file, got 18 instead of 19 bytes
This could happen when writing the file header works, but writing
the actual data fails.
Now we kill the header again by truncating the file to zero.
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This function will enable "gocryptfs -fsck" to handle
sparse files efficiently.
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"gocryptfs -fsck" will need access to helper functions,
and to get that, it will need to cast a gofuse.File to a
fusefrontend.File. Make fusefrontend.File exported to make
this work.
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...if doWrite() can do it for us. This avoids the situation
that the file only consists of a file header when calling
doWrite.
A later patch will check for this condition and warn about it,
as with this change it should no longer occour in normal operation.
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The details of the hole handling don't have to be in
Write, so move it away.
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...and add comments for what is happening.
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Also delete the unused "dirIVNameStruct", found by deadcode.
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We were growing the file block-by-block which was pretty
inefficient. We now coalesce all the grows into a single
Ftruncate. Also simplifies the code!
Simplistic benchmark: Before:
$ time truncate -s 1000M foo
real 0m0.568s
After:
$ time truncate -s 1000M foo
real 0m0.205s
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tlog is used heavily everywhere and deserves a shorter name.
Renamed using sed magic, without any manual rework:
find * -type f -exec sed -i 's/toggledlog/tlog/g' {} +
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"git status" for reference:
renamed: pathfs_frontend/args.go -> internal/fusefrontend/args.go
renamed: pathfs_frontend/compat_darwin.go -> internal/fusefrontend/compat_darwin.go
renamed: pathfs_frontend/compat_linux.go -> internal/fusefrontend/compat_linux.go
renamed: pathfs_frontend/file.go -> internal/fusefrontend/file.go
renamed: pathfs_frontend/file_holes.go -> internal/fusefrontend/file_holes.go
renamed: pathfs_frontend/fs.go -> internal/fusefrontend/fs.go
renamed: pathfs_frontend/fs_dir.go -> internal/fusefrontend/fs_dir.go
renamed: pathfs_frontend/names.go -> internal/fusefrontend/names.go
renamed: pathfs_frontend/write_lock.go -> internal/fusefrontend/write_lock.go
modified: main.go
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