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author | Phillip Lougher <phillip@squashfs.org.uk> | 2013-11-13 02:56:26 +0000 |
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committer | Phillip Lougher <phillip@squashfs.org.uk> | 2013-11-20 03:35:18 +0000 |
commit | 9508c6b90b3f57ecea4e7a896cf8325400fc0c6e (patch) | |
tree | a31589009d7d85d722b52c0ef21838ca6d2888da /fs/squashfs/lzo_wrapper.c | |
parent | 959f58544b7f20c92d5eb43d1232c96c15c01bfb (diff) | |
download | linux-9508c6b90b3f57ecea4e7a896cf8325400fc0c6e.tar.gz linux-9508c6b90b3f57ecea4e7a896cf8325400fc0c6e.tar.bz2 linux-9508c6b90b3f57ecea4e7a896cf8325400fc0c6e.zip |
Squashfs: Refactor decompressor interface and code
The decompressor interface and code was written from
the point of view of single-threaded operation. In doing
so it mixed a lot of single-threaded implementation specific
aspects into the decompressor code and elsewhere which makes it
difficult to seamlessly support multiple different decompressor
implementations.
This patch does the following:
1. It removes compressor_options parsing from the decompressor
init() function. This allows the decompressor init() function
to be dynamically called to instantiate multiple decompressors,
without the compressor options needing to be read and parsed each
time.
2. It moves threading and all sleeping operations out of the
decompressors. In doing so, it makes the decompressors
non-blocking wrappers which only deal with interfacing with
the decompressor implementation.
3. It splits decompressor.[ch] into decompressor generic functions
in decompressor.[ch], and moves the single threaded
decompressor implementation into decompressor_single.c.
The result of this patch is Squashfs should now be able to
support multiple decompressors by adding new decompressor_xxx.c
files with specialised implementations of the functions in
decompressor_single.c
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Diffstat (limited to 'fs/squashfs/lzo_wrapper.c')
-rw-r--r-- | fs/squashfs/lzo_wrapper.c | 24 |
1 files changed, 5 insertions, 19 deletions
diff --git a/fs/squashfs/lzo_wrapper.c b/fs/squashfs/lzo_wrapper.c index 00f4dfc5f088..75c3b5779172 100644 --- a/fs/squashfs/lzo_wrapper.c +++ b/fs/squashfs/lzo_wrapper.c @@ -37,7 +37,7 @@ struct squashfs_lzo { void *output; }; -static void *lzo_init(struct squashfs_sb_info *msblk, void *buff, int len) +static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) { int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); @@ -74,22 +74,16 @@ static void lzo_free(void *strm) } -static int lzo_uncompress(struct squashfs_sb_info *msblk, void **buffer, - struct buffer_head **bh, int b, int offset, int length, int srclength, - int pages) +static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm, + void **buffer, struct buffer_head **bh, int b, int offset, int length, + int srclength, int pages) { - struct squashfs_lzo *stream = msblk->stream; + struct squashfs_lzo *stream = strm; void *buff = stream->input; int avail, i, bytes = length, res; size_t out_len = srclength; - mutex_lock(&msblk->read_data_mutex); - for (i = 0; i < b; i++) { - wait_on_buffer(bh[i]); - if (!buffer_uptodate(bh[i])) - goto block_release; - avail = min(bytes, msblk->devblksize - offset); memcpy(buff, bh[i]->b_data + offset, avail); buff += avail; @@ -111,17 +105,9 @@ static int lzo_uncompress(struct squashfs_sb_info *msblk, void **buffer, bytes -= avail; } - mutex_unlock(&msblk->read_data_mutex); return res; -block_release: - for (; i < b; i++) - put_bh(bh[i]); - failed: - mutex_unlock(&msblk->read_data_mutex); - - ERROR("lzo decompression failed, data probably corrupt\n"); return -EIO; } |