- 10 Sep, 2005 3 commits
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Ingo Molnar authored
This patch (written by me and also containing many suggestions of Arjan van de Ven) does a major cleanup of the spinlock code. It does the following things: - consolidates and enhances the spinlock/rwlock debugging code - simplifies the asm/spinlock.h files - encapsulates the raw spinlock type and moves generic spinlock features (such as ->break_lock) into the generic code. - cleans up the spinlock code hierarchy to get rid of the spaghetti. Most notably there's now only a single variant of the debugging code, located in lib/spinlock_debug.c. (previously we had one SMP debugging variant per architecture, plus a separate generic one for UP builds) Also, i've enhanced the rwlock debugging facility, it will now track write-owners. There is new spinlock-owner/CPU-tracking on SMP builds too. All locks have lockup detection now, which will work for both soft and hard spin/rwlock lockups. The arch-level include files now only contain the minimally necessary subset of the spinlock code - all the rest that can be generalized now lives in the generic headers: include/asm-i386/spinlock_types.h | 16 include/asm-x86_64/spinlock_types.h | 16 I have also split up the various spinlock variants into separate files, making it easier to see which does what. The new layout is: SMP | UP ----------------------------|----------------------------------- asm/spinlock_types_smp.h | linux/spinlock_types_up.h linux/spinlock_types.h | linux/spinlock_types.h asm/spinlock_smp.h | linux/spinlock_up.h linux/spinlock_api_smp.h | linux/spinlock_api_up.h linux/spinlock.h | linux/spinlock.h /* * here's the role of the various spinlock/rwlock related include files: * * on SMP builds: * * asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the * initializers * * linux/spinlock_types.h: * defines the generic type and initializers * * asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel * implementations, mostly inline assembly code * * (also included on UP-debug builds:) * * linux/spinlock_api_smp.h: * contains the prototypes for the _spin_*() APIs. * * linux/spinlock.h: builds the final spin_*() APIs. * * on UP builds: * * linux/spinlock_type_up.h: * contains the generic, simplified UP spinlock type. * (which is an empty structure on non-debug builds) * * linux/spinlock_types.h: * defines the generic type and initializers * * linux/spinlock_up.h: * contains the __raw_spin_*()/etc. version of UP * builds. (which are NOPs on non-debug, non-preempt * builds) * * (included on UP-non-debug builds:) * * linux/spinlock_api_up.h: * builds the _spin_*() APIs. * * linux/spinlock.h: builds the final spin_*() APIs. */ All SMP and UP architectures are converted by this patch. arm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via crosscompilers. m32r, mips, sh, sparc, have not been tested yet, but should be mostly fine. From: Grant Grundler <grundler@parisc-linux.org> Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU). Builds 32-bit SMP kernel (not booted or tested). I did not try to build non-SMP kernels. That should be trivial to fix up later if necessary. I converted bit ops atomic_hash lock to raw_spinlock_t. Doing so avoids some ugly nesting of linux/*.h and asm/*.h files. Those particular locks are well tested and contained entirely inside arch specific code. I do NOT expect any new issues to arise with them. If someone does ever need to use debug/metrics with them, then they will need to unravel this hairball between spinlocks, atomic ops, and bit ops that exist only because parisc has exactly one atomic instruction: LDCW (load and clear word). From: "Luck, Tony" <tony.luck@intel.com> ia64 fix Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Arjan van de Ven <arjanv@infradead.org> Signed-off-by:
Grant Grundler <grundler@parisc-linux.org> Cc: Matthew Wilcox <willy@debian.org> Signed-off-by:
Hirokazu Takata <takata@linux-m32r.org> Signed-off-by:
Mikael Pettersson <mikpe@csd.uu.se> Signed-off-by:
Benoit Boissinot <benoit.boissinot@ens-lyon.org> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Alan Cox authored
pcibus_to_cpumask expands into more than just an initialiser so gcc moans about code before variable declarations. Signed-off-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Andrew Morton authored
*** Warning: "bit_spin_lock" [fs/ntfs/ntfs.ko] undefined! *** Warning: "bit_spin_unlock" [fs/ntfs/ntfs.ko] undefined! Cc: Anton Altaparmakov <aia21@cantab.net> Signed-off-by:
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- 09 Sep, 2005 37 commits
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NeilBrown authored
This shouldn't be a BUG. We should cope. Signed-off-by:
Neil Brown <neilb@suse.de> Signed-off-by:
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NeilBrown authored
If you try to assemble an array with too many missing devices, raid10 will now reject the attempt, instead of allowing it. Also check when hot-adding a drive and refuse the hot-add if the array is beyond hope. Signed-off-by:
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NeilBrown authored
There was another case where sb_size wasn't being set, so instead do the sensible thing and set if when filling in the content of a superblock. That ensures that whenever we write a superblock, the sb_size MUST be set. Signed-off-by:
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NeilBrown authored
[PATCH] md: make sure the new 'sb_size' is set properly device added without pre-existing superblock. There are two ways to add devices to an md/raid array. It can have superblock written to it, and then given to the md driver, which will read the superblock (the new way) or md can be told (through SET_ARRAY_INFO) the shape of the array, and the told about individual drives, and md will create the required superblock (the old way). The newly introduced sb_size was only set for drives being added the new way, not the old ways. Oops :-( Signed-off-by:
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NeilBrown authored
Just like failed drives have (F), so spare drives now have (S). Signed-off-by:
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NeilBrown authored
Leave it unchanged if the original (0.90) is used, incase it might be a compatability problem. Signed-off-by:
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NeilBrown authored
Doh. I want the physical hard-sector-size, not the current block size... Signed-off-by:
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NeilBrown authored
On reflection, a better default location for hot-adding bitmaps with version-1 superblocks is immediately after the superblock. There might not be much room there, but there is usually atleast 3k, and that is a good start. Signed-off-by:
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NeilBrown authored
The bitmap code used to have two daemons, so there is some 'common' start/stop code. But now there is only one, so the common code is just noise. This patch tidies this up somewhat. Signed-off-by:
Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by:
Adrian Bunk <bunk@stusta.de> Signed-off-by:
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NeilBrown authored
mddev->bitmap gets clearred before the writeback daemon is stopped. So the write_back daemon needs to be careful not to dereference the 'bitmap' if it is NULL. Signed-off-by:
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NeilBrown authored
Switch MD to use the kthread infrastructure, to simplify the code and get rid of tasklist_lock abuse in md_unregister_thread. Also don't flush signals in md_thread, as the called thread will always do that. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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NeilBrown authored
This is a direct port of the raid5 patch. Signed-off-by:
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NeilBrown authored
Most awkward part of this is delaying write requests until bitmap updates have been flushed. To achieve this, we have a sequence number (seq_flush) which is incremented each time the raid5 is unplugged. If the raid thread notices that this has changed, it flushes bitmap changes, and assigned the value of seq_flush to seq_write. When a write request arrives, it is given the number from seq_write, and that write request may not complete until seq_flush is larger than the saved seq number. We have a new queue for storing stripes which are waiting for a bitmap flush and an extra flag for stripes to record if the write was 'degraded' and so should not clear the a bit in the bitmap. Signed-off-by:
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NeilBrown authored
version-1 superblocks are not (normally) 4K long, and can be of variable size. Writing the full 4K can cause corruption (but only in non-default configurations). With this patch the super-block-flavour can choose a size to read, and set a size to write based on what it finds. Signed-off-by:
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NeilBrown authored
These inlines haven't been used for ages, they should go. Signed-off-by:
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NeilBrown authored
read_sb_page() assumed that if sync_page_io fails, the device would be marked faultly. However it isn't. So in the face of error, read_sb_page would loop forever. Redo the logic so that this cannot happen. Signed-off-by:
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NeilBrown authored
As this is used to flag an internal bitmap. Also, introduce symbolic names for feature bits. Signed-off-by:
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NeilBrown authored
It is possibly (and occasionally useful) to have a raid1 without persistent superblocks. The code in add_new_disk for adding a device to such an array always tries to read a superblock. This will obviously fail. So do the appropriate test and call md_import_device with appropriate args. Signed-off-by:
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NeilBrown authored
When hot-adding a bitmap, bitmap_daemon_work could get called while the bitmap is being created, so don't set mddev->bitmap until the bitmap is ready. This requires freeing the bitmap inside bitmap_create if creation failed part-way through. Signed-off-by:
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NeilBrown authored
The 'lastrun' time wasn't being initialised, so it could be half a jiffie-cycle before it seemed to be time to do work again. Signed-off-by:
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NeilBrown authored
A state of 0 mean 'not quiesced' A state of 1 means 'is quiesced' The original code got this wrong. Signed-off-by:
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NeilBrown authored
linear currently uses division by the size of the smallest componenet device to find which device a request goes to. If that smallest device is larger than 2 terabytes, then the division will not work on some systems. So we introduce a pre-shift, and take care not to make the hash table too large, much like the code in raid0. Also get rid of conf->nr_zones, which is not needed. Signed-off-by:
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NeilBrown authored
If a device is flagged 'WriteMostly' and the array has a bitmap, and the bitmap superblock indicates that write_behind is allowed, then write_behind is enabled for WriteMostly devices. Write requests will be acknowledges as complete to the caller (via b_end_io) when all non-WriteMostly devices have completed the write, but will not be cleared from the bitmap until all devices complete. This requires memory allocation to make a local copy of the data being written. If there is insufficient memory, then we fall-back on normal write semantics. Signed-Off-By:
Paul Clements <paul.clements@steeleye.com> Signed-off-by:
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NeilBrown authored
This allows a device in a raid1 to be marked as "write mostly". Read requests will only be sent if there is no other option. Signed-off-by:
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NeilBrown authored
Both file-bitmaps and superblock bitmaps are supported. If you add a bitmap file on the array device, you lose. This introduces a 'default_bitmap_offset' field in mddev, as the ioctl used for adding a superblock bitmap doesn't have room for giving an offset. Later, this value will be setable via sysfs. Signed-off-by:
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NeilBrown authored
When we find a 'stale' bitmap, possibly because it is new, we should just assume every bit needs to be set, but rather base the setting of bits on the current state of the array (degraded and recovery_cp). Signed-off-by:
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NeilBrown authored
... otherwise we loose a reference and can never free the file. Signed-off-by:
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Jun'ichi Nomura authored
Fix another bug in dm-raid1.c that the dirty region may stay in or be moved to clean list and freed while in use. It happens as follows: CPU0 CPU1 ------------------------------------------------------------------------------ rh_dec() if (atomic_dec_and_test(pending)) <the region is still marked dirty> rh_inc() if the region is clean mark the region dirty and remove from clean list mark the region clean and move to clean list atomic_inc(pending) At this stage, the region is in clean list and will be mistakenly reclaimed by rh_update_states() later. Signed-off-by:Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by:
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NeilBrown authored
md does not yet support BIO_RW_BARRIER, so be honest about it and fail (-EOPNOTSUPP) any such requests. Signed-off-by:
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NeilBrown authored
'this_sector' is a virtual (array) address while 'head_position' is a physical (device) address, so substraction doesn't make any sense. devs[slot].addr should be used instead of this_sector. However, this patch doesn't make much practical different to the read balancing due to the effects of later code. Signed-off-by:
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Linus Torvalds authored
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Linus Torvalds authored
Don't just irritate all other kernel developers. Fix the users first, then you can re-introduce the must-check infrastructure to avoid new cases creeping in. Signed-off-by: -
Linus Torvalds authored
Fix up fs/compat.c fixes.
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Daniel Ritz authored
This fixes the problem with "Averatec 6240 pcmcia_socket0: unable to apply power", which was due to the CardBus IOMEM register region being allocated at an address that was actually inside the RAM window that had been reserved for video frame-buffers in an UMA setup. The BIOS _should_ have marked that region reserved in the e820 memory descriptor tables, but did not. It is fixed by rounding up the default starting address of PCI memory allocations, so that we leave a bigger gap after the final known memory location. The amount of rounding depends on how big the unused memory gap is that we can allocate IOMEM from. Based on example code by Linus. Acked-by:
Greg KH <greg@kroah.com> Acked-by:
Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by:
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Linus Torvalds authored
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Linus Torvalds authored
Andrew lost this in patch reject resolution, and never noticed, since the compat code isn't in use on x86. Signed-off-by: -
Linus Torvalds authored
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