- 13 Jan, 2011 40 commits
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Lasse Collin authored
In userspace, the .lzma format has become mostly a legacy file format that got superseded by the .xz format. Similarly, LZMA Utils was superseded by XZ Utils. These patches add support for XZ decompression into the kernel. Most of the code is as is from XZ Embedded <http://tukaani.org/xz/embedded.html>. It was written for the Linux kernel but is usable in other projects too. Advantages of XZ over the current LZMA code in the kernel: - Nice API that can be used by other kernel modules; it's not limited to kernel, initramfs, and initrd decompression. - Integrity check support (CRC32) - BCJ filters improve compression of executable code on certain architectures. These together with LZMA2 can produce a few percent smaller kernel or Squashfs images than plain LZMA without making the decompression slower. This patch: Add the main decompression code (xz_dec), testing module (xz_dec_test), wrapper script (xz_wrap.sh) for the xz command line tool, and documentation. The xz_dec module is enough to have a usable XZ decompressor e.g. for Squashfs. Signed-off-by:
Lasse Collin <lasse.collin@tukaani.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Alain Knaff <alain@knaff.lu> Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com> Cc: Phillip Lougher <phillip@lougher.demon.co.uk> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Lasse Collin authored
Callback-to-callback decompression mode is used for initrd (not initramfs). The LZO wrapper is broken for this use case for two reasons: - The argument validation is needlessly too strict by requiring that "posp" is non-NULL when "fill" is non-NULL. - The buffer handling code didn't work at all for this use case. I tested with LZO-compressed kernel, initramfs, initrd, and corrupt (truncated) initramfs and initrd images. Signed-off-by: -
Lasse Collin authored
The code assumes that the input is valid and not truncated. Add checks to avoid reading past the end of the input buffer. Change the type of "skip" from u8 to int to fix a possible integer overflow. Signed-off-by:
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Lasse Collin authored
The return value of flush() is not checked in unlzo(). This means that the decompressor won't stop even if the caller doesn't want more data. This can happen e.g. with a corrupt LZO-compressed initramfs image. Signed-off-by:
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Lasse Collin authored
Validate the newly decoded distance (rep0) in process_bit1(). This is to detect corrupt LZMA data quickly. The old code can run for long time producing garbage until it hits the end of the input. Signed-off-by:
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Lasse Collin authored
The return value of wr->flush() is not checked in write_byte(). This means that the decompressor won't stop even if the caller doesn't want more data. This can happen e.g. with corrupt LZMA-compressed initramfs. Returning the error quickly allows the user to see the error message quicker. There is a similar missing check for wr.flush() near the end of unlzma(). Signed-off-by:
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Lasse Collin authored
Return value of rc->fill() is checked in rc_read() and error() is called when needed, but then the code continues as if nothing had happened. rc_read() is a void function and it's on the top of performance critical call stacks, so propagating the error code via return values doesn't sound like the best fix. It seems better to check rc->buffer_size (which holds the return value of rc->fill()) in the main loop. It does nothing bad that the code runs a little with unknown data after a failed rc->fill(). This fixes an infinite loop in initramfs decompression if the LZMA-compressed initramfs image is corrupt. Signed-off-by:
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Lasse Collin authored
Validation of header.pos calls error() but doesn't make the function return to indicate an error to the caller. Instead the decoding is attempted with invalid header.pos. This fixes it. Signed-off-by:
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Lasse Collin authored
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Lasse Collin authored
Currently users of mm.h need to include <linux/slab.h> to use the macros malloc() and free() provided by mm.h. This fixes it. Signed-off-by:
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Lasse Collin authored
set_error_fn() has become a useless complication after c1e7c3ae ("bzip2/lzma/gzip: pre-boot malloc doesn't return NULL on failure") fixed the use of error() in malloc(). Only decompress_unlzma.c had some use for it and that was easy to change too. This also gets rid of the static function pointer "error", which should have been marked as __initdata. Signed-off-by:
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Lasse Collin authored
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Mike Frysinger authored
This header uses things like __be32, so pull in linux/types.h. Further, it uses BLOCK_SIZE, so pull in linux/fs.h. Signed-off-by:
Mike Frysinger <vapier@gentoo.org> Signed-off-by:
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Andrew Morton authored
Cc: Ahmed S. Darwish <darwish.07@gmail.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Marco Stornelli <marco.stornelli@gmail.com> Signed-off-by:
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Stefani Seibold authored
Generate a unique inode numbers for any entries in the cram file system. For files which did not contain data's (device nodes, fifos and sockets) the offset of the directory entry inside the cramfs plus 1 will be used as inode number. The + 1 for the inode will it make possible to distinguish between a file which contains no data and files which has data, the later one has a inode value where the lower two bits are always 0. It also reimplements the behavior to set the size and the number of block to 0 for special file, which is the right value for empty files, devices, fifos and sockets As a little benefit it will be also more compatible which older mkcramfs, because it will never use the cramfs_inode->offset for creating a inode number for special files. [akpm@linux-foundation.org: trivial comment fix] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Stefani Seibold <stefani@seibold.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by:
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Alexander Shishkin authored
Currently, 3 kernel function prototypes are present in a header file exported to userland. This patch fixes it. Signed-off-by:
Alexander Shishkin <virtuoso@slind.org> Signed-off-by:
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Jeff Moyer authored
aio_run_iocbs() is not used at all, so get rid of it. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Jeff Moyer <jmoyer@redhat.com> Signed-off-by:
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Namhyung Kim authored
'nr >= min_nr >= 0' always satisfies 'nr >= 0' so the check is unnecesary. Signed-off-by:
Namhyung Kim <namhyung@gmail.com> Acked-by:
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Dmitry Torokhov authored
When hypervisor decides to decrease target balloon size while the balloon driver tries to lock pages hypervisor may respond with VMW_BALLOON_PPN_NOTNEEDED. Use this data and immediately stop reserving pages and wait for the next update cycle to fetch new target instead of continuing trying to lock pages until size of refused list grows above VMW_BALLOON_MAX_REFUSED (16) pages. As a result the driver stops bothering the hypervisor with its attempts to lock more pages that are not needed anymore. Most likely next order from hypervisor will be to reduce ballon size anyway. It is a small optimization. Signed-off-by:
Dmitry Torokhov <dtor@vmware.com> Signed-off-by:
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Mika Laitio authored
This is a 1-wire/w1 DS2423 slave driver for reading the values from all 4 counters available DS2423 devices by using standard w1_slave file. In ds2423 the counters are tied to ram pages 12-15 in and each of those ram-pages. Each of these counter values (and asoociated ram page values) are represented as a own line in w1_slave file. Driver has been tested on mips and x86. usage example: cat /sys/bus/w1/devices/1d-00000009b964/w1_slave 00 02 00 00 00 00 00 00 00 6d 38 00 ff ff 00 00 fe ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=2 00 02 00 00 00 00 00 00 00 e0 1f 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=2 00 5a 0e 5f 18 00 00 00 00 0b 28 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff 00 00 ff ff crc=YES c=408882778 00 05 00 00 00 00 00 00 00 8d 39 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff crc=YES c=5 Patch includes also the documentation. [randy.dunlap@oracle.com: fix ds2423 build, needs to select CRC16] Signed-off-by:
Mika Laitio <lamikr@pilppa.org> Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by:
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Alex Dubov authored
Apart from currently used standard memstick data transfer method, Sony introduced several newer ones, to uncover full bandwidth/capacity of its Pro, HG and XC media formats. This patch lays a foundation to enable those methods as made possible by host/media capabilities. As a side effect of this patch, mspro_block_read_attributes became more streamlined and readable. [akpm@linux-foundation.org: fix printk warning] Signed-off-by:
Alex Dubov <oakad@yahoo.com> Reported-by:
Maxim Levitsky <maximlevitsky@gmail.com> Signed-off-by:
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Alex Dubov authored
mspro_block_mutex is identical in scope to mspro_block_disk_lock and therefore unnecessary. Signed-off-by:
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Alex Dubov authored
Implement the usual pattern around idr_pre_get() and idr_get_new() to handlethe situation where another thread concurrently steals this thread's idr_pre_get() preallocation. Signed-off-by:
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Takashi Iwai authored
Signed-off-by:
Aries Lee <arieslee@jmicron.com> Signed-off-by:
Takashi Iwai <tiwai@suse.de> Cc: Alex Dubov <oakad@yahoo.com> Signed-off-by:
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Takashi Iwai authored
Add a function jmb38x_ms_pmos() to enable / disable PMOS setups for JMicron 38x controllers. Signed-off-by:
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Takashi Iwai authored
This patch corrects the definition of clock values for JMicron 38x controllers and sets the value properly per interface type. Also, it adds a check for TPC errors in the interrupt handler. Signed-off-by:
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Vasiliy Kulikov authored
If device_register() fails then call put_device(). See comment to device_register. Signed-off-by:
Vasiliy Kulikov <segooon@gmail.com> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Alex Dubov <oakad@yahoo.com> Signed-off-by:
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Alexander Gordeev authored
Add PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. Signed-off-by:
Alexander Gordeev <lasaine@lvk.cs.msu.su> Cc: Rodolfo Giometti <giometti@linux.it> Signed-off-by:
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Alexander Gordeev authored
Add PPS signal generator which utilizes STROBE pin of a parallel port to send PPS signals. It uses parport abstraction layer and hrtimers to precisely control the signal. [akpm@linux-foundation.org: fix build] Signed-off-by:
Rodolfo Giometti <giometti@linux.it> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by:
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Alexander Gordeev authored
Add parallel port PPS client. It uses a standard method for capturing timestamps for assert edge transitions: getting a timestamp soon after an interrupt has happened. This is not a very precise source of time information due to interrupt handling delays. However, timestamps for clear edge transitions are much more precise because the interrupt handler continuously polls hardware port until the transition is done. Hardware port operations require only about 1us so the maximum error should not exceed this value. This was my primary goal when developing this client. Clear edge capture could be disabled using clear_wait parameter. Signed-off-by:
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Alexander Gordeev authored
Add an optional feature of PPSAPI, kernel consumer support, which uses the added hardpps() function. Signed-off-by:
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Alexander Gordeev authored
MONOTONIC_RAW clock timestamps are ideally suited for frequency calculation and also fit well into the original NTP hardpps design. Now phase and frequency can be adjusted separately: the former based on REALTIME clock and the latter based on MONOTONIC_RAW clock. A new function getnstime_raw_and_real is added to timekeeping subsystem to capture both timestamps at the same time and atomically. Signed-off-by:
John Stultz <johnstul@us.ibm.com> Cc: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by:
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Alexander Gordeev authored
This commit adds hardpps() implementation based upon the original one from the NTPv4 reference kernel code from David Mills. However, it is highly optimized towards very fast syncronization and maximum stickness to PPS signal. The typical error is less then a microsecond. To make it sync faster I had to throw away exponential phase filter so that the full phase offset is corrected immediately. Then I also had to throw away median phase filter because it gives a bigger error itself if used without exponential filter. Maybe we will find an appropriate filtering scheme in the future but it's not necessary if the signal quality is ok. Signed-off-by:
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Alexander Gordeev authored
Remove the code that gatheres timestamp in pps_tty_dcd_change() in case passed ts parameter is NULL because it never happens in the current code. Fix comments as well. Signed-off-by:
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Alexander Gordeev authored
Bitwise conjunction is distributive so we can simplify some conditions. Signed-off-by:
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Alexander Gordeev authored
This way less overhead is involved when running production kernel. If you want to debug a pps client module please define DEBUG to enable the checks. Signed-off-by:
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Alexander Gordeev authored
Now pps_idr_lock is never used in interrupt context so we can replace spin_lock_irq/spin_unlock_irq with plain spin_lock/spin_unlock. But there is also a potential race condition when someone can steal an id which was allocated by idr_pre_get before it is used. So convert spin lock to mutex and protect the whole id generation process. Signed-off-by:
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Alexander Gordeev authored
Since now idr is only used to manage char device id's and not used in kernel API anymore it should be moved to pps.c. This also makes it possible to release id only at actual device freeing so nobody can register a pps device with the same id while our device is not freed yet. Signed-off-by:
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Alexander Gordeev authored
Since we now have direct pointers to struct pps_device everywhere it's easy to use dev_* functions to print messages instead of plain printks. Where dev_* cannot be used printks are converted to pr_*. Signed-off-by:
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Alexander Gordeev authored
Using device index as a pointer needs some unnecessary work to be done every time the pointer is needed (in irq handler for example). Using a direct pointer is much more easy (and safe as well). Signed-off-by:
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