- 23 Aug, 2004 40 commits
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Andrew Morton authored
It seems fair to assume that it is always unlikely that IS_ERR will return true. This patch changes the gcc-3.4-generated kernel text by ~500 bytes (less) so it's fair to assume that the compiler is indeed propagating unlikeliness out of inline functions. Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Badari Pulavarty authored
I found one more accounting inconsistency with dio_pages_in_io. This is a day-one bug and I started hitting it on latest -mm due to the recent changes to dio_pages_in_io calculations to be exact. If the file is badly fragmented (no contiguous blocks at all), and the user buffer is not page aligned - we need to create IO for each disk block with 2 pages. (bio with 2 vecs). dio_bio_add_page() should not decrement dio_pages_in_io for every add page. It should only decrement, it only if its done with that page and moving on to next page. (since dio_pages_in_io represent how many actual pages we are operating on). Here is the patch to fix this accounting. Without this patch, we will hit BUG() in dio_new_bio() with O_DIRECT on filesystems. Signed-off-by:
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Badari Pulavarty authored
We're being lazy when calculating the size of the needed BIO, allocating two extra pages to cope with funny alignments. Change that to be exact, thus allocating smaller BIOs someties. Signed-off-by:
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Corey Minyard authored
Some people found some bugs and some missing functions in the IPMI driver, so I have patching things together for the next release. The attached patch moves to version 33 of the driver and contains: * SMBIOS table support for specifying register spacing. This allows non-contiguous registers to be specified and some machines do this. * ACPI table updates to support all the possible register sizes and bit offsets into the registers for the IPMI information. * Support for command line parameters to specify register spacing, sizes, and bit offsets. * Support for power control with IPMI. This allows a halt to power down a machine with IPMI. * A fix for a race condition with interrupts enabled on an SMP machine. A lock was released then reclaimed, but there was code later that assumed that had not happened. * A fix for protecting the driver against bad responses from the controller chip. In the past, the driver had assumed that the controller chip would not give it bad data. This has turned out to be a bad assumption * ACPI interrupt handlers now return a return value, adjust accordingly. Thank you to all the people who helped me with this. Signed-off-by:
Corey Minyard <minyard@acm.org> Signed-off-by:
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Corey Minyard authored
Makes the IPMI watchdog more consistent with the other watchdog drivers. I have tested this and it seems to work correctly. I also added docs for the interface change. - support disabling watchdog by writing 'V' to device. - unify printk() - use atomic bit operations on ipmi_wdog_open Signed-off-by:
Arkadiusz Miskiewicz <arekm@pld-linux.org> Signed-off-by:
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Paul Clements authored
Here's a patch to fix a race condition in nbd that was causing struct request corruption (requests were being freed while still in use). This patch improves on the previous one, which admittedly was a bit dodgy, using struct request's ref_count field (I should have listened to Jens in the first place :). This should fix all the corner cases related to struct request usage/freeing in nbd. My stress tests do a lot better with this patch applied. Signed-off-by:
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William Lee Irwin III authored
Nuke the real undefined symbol in sparc32. This is the only real hit from ldchk on sparc32; the rest are all btfixup-related (Sam Ravnborg and I are working on addressing that). Signed-off-by:
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Sean Neakums authored
This patch kills two printks from UDF that announce its registration and unregistration. Since one can determine which filesystems are present by examining /proc/filesystems, these messages strike me as noise. Signed-off-by:
Sean Neakums <sneakums@zork.net> Signed-off-by:
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Janice M. Girouard authored
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Jens Axboe authored
A few fixes related to cdrom media event notification. These are from Alexander Kern <alex.kern@gmx.de> Signed-off-by:
Jens Axboe <axboe@suse.de> Signed-off-by:
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Neil Brown authored
Fix a problem wherein device nodes on a ro-exported mount cannot be opened read/write. Signed-off-by:
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Neil Brown authored
To purge an nfsd-authentication cache, we set the flush time to later than last-refresh time in the cache and call cache_flush. The easiest way to find 'later than last-refresh' is 'now+1'. This has two problems. 1/ if the time-of-day clock has gone bacwards, some entries might not be purged 2/ if a new entry is added in the same second as cache_purge ran, it will get ignored. To resolve these issues, we set the flushtime to the maximum possible time before calling cache_flush, and then set it back to the minimum time afterwards. Signed-off-by:Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by:
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Neil Brown authored
More fall-out from the change to allow multi-page replies to readdir requests. Signed-off-by:
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Neil Brown authored
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Neil Brown authored
This is only used by nfsd to save one kmalloc, and the code is not always kept up-to-date with dentry_open, so just get rid of it. Signed-off-by:
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Bruce Allan authored
Bruce Allan says: The user-specified fsid= export option still doesn't work after the changes made 5 months ago. Below is a patch against 2.6.7 through the recent 2.6.8-rc2-bk13. Signed-off-by:
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Neil Brown authored
Server-side support for the limited portion of the NFSv4 ACL protocol necessary to support POSIX ACLs. Will return an error on an attempt to set any ACL that doesn't map to a POSIX ACL. Signed-off-by:
J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by:
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Neil Brown authored
Code to translate between Linux's POSIX ACLs and NFSv4 ACLs. Since NFSv4 ACLs are fundamentally richer, we are able to translate any POSIX ACL to NFSv4, but can only map NFSv4 ACLs that follow a certain format; see http://www.citi.umich.edu/u/marius/draft-eriksen-nfsv4-acl-02.txt for details of the mapping. Signed-off-by:
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Neil Brown authored
Basic v4 acl definitions, to be used by server ACL implementation Signed-off-by:
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Neil Brown authored
Fix a leak: when auth_unix_lookup sets CACHE_NEGATIVE, it should also auth_domain_put() the reference it holds in ipm->m_client, since setting CACHE_NEGATIVE prevents ip_map_put() from putting the reference itself. Signed-off-by:
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Neil Brown authored
The interface between the auth_domain and the cache code is messy; the auth_domain code is the only real user of the full 11-argument DefineCacheLookup, and does weird stuff with it (like passing in through one of the arguments a bit of code with a conditional return). We could further parametrize DefineCacheLookup, but I think it's already too complicated. My solution is to just ignore DefineCacheLookup and write the auth_domain_lookup function from scratch. It's actually a pretty short function (much simpler than DefineCacheLookup itself), and it's much easier to read this short function than it is to read some special-cased DefineCacheLookup to verify that it does what it says it does.... Signed-off-by:
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Neil Brown authored
Presumably anyone creating a new cache entry is going to want a reference on that cache; and indeed every caller of cache_init increments the reference count immediately afterwards. So may as well make cache_init set an initial reference count of 1. Also, note that cache_init initializes the flags; callers don't need to. Signed-off-by:
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Neil Brown authored
nfsd is missing a put_group_info in the auth_null case. Signed-off-by:
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Neil Brown authored
NFSv4 should really run over TCP, and clients will expect that; so there's no point letting people build kernels that support NFSv4 without also supporting server-side TCP. Signed-off-by:
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Andrew Morton authored
In databases it is common to have multiple threads or processes performing O_SYNC writes against different parts of the same file. Our performance at this is poor, because each writer blocks access to the file by waiting on I/O completion while holding i_sem: everything is serialised. The patch improves things by moving the writing and waiting outside i_sem. So other threads can get in and submit their I/O and permit the disk scheduler to optimise the IO patterns better. Also, the O_SYNC writer only writes and waits on the pages which he wrote, rather than writing and waiting on all dirty pages in the file. The reason we haven't been able to do this before is that the required walk of the address_space page lists is easily livelockable without the i_sem serialisation. But in this patch we perform the waiting via a radix-tree walk of the affected pages. This cannot be livelocked. The sync of the inode's metadata is still performed inside i_sem. This is because it is list-based and is hence still livelockable. However it is usually the case that databases are overwriting existing file blocks and there will be no dirty buffers attached to the address_space anyway. The code is careful to ensure that the IO for the pages and the IO for the metadata are nonblockingly scheduled at the same time. This is am improvemtn over the current code, which will issue two separate write-and-wait cycles: one for metadata, one for pages. Note from Suparna: Reworked to use the tagged radix-tree based writeback infrastructure. Signed-off-by:
Suparna Bhattacharya <suparna@in.ibm.com> Signed-off-by:
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Suparna Bhattacharya authored
Range based equivalent of filemap_fdatawrite for O_SYNC writers (to go with writepages range support added to mpage_writepages). If both <start> and <end> are zero, then it defaults to writing back all of the mapping's dirty pages. Signed-off-by:
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Suparna Bhattacharya authored
Safeguard to make sure we break out of pagevec_lookup_tag loop if we are beyond the specified range. Signed-off-by:
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Suparna Bhattacharya authored
wait_on_page_writeback_range shouldn't wait for pages beyond the specified range. Ideally, the radix-tree-lookup could accept an end_index parameter so that it doesn't return the extra pages in the first place, but for now we just add a few extra checks to skip such pages. Signed-off-by:
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Andrew Morton authored
Modify mpage_writepages to optionally only write back dirty pages within a specified range in a file (as in the case of O_SYNC). Cheat a little to avoid changes to prototypes of aops - just put the <start, end> hint into the writeback_control struct instead. If <start, end> are not set, then default to writing back all the mapping's dirty pages. Signed-off-by:
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Rik van Riel authored
The following experimental patch implements token based thrashing protection, using the algorithm described in: http://www.cs.wm.edu/~sjiang/token.htm When there are pageins going on, a task can grab a token, that protects the task from pageout (except by itself) until it is no longer doing heavy pageins, or until the maximum hold time of the token is over. If the maximum hold time is exceeded, the task isn't eligable to hold the token for a while more, since it wasn't doing it much good anyway. I have run a very unscientific benchmark on my system to test the effectiveness of the patch, timing how a 230MB two-process qsbench run takes, with and without the token thrashing protection present. normal 2.6.8-rc6: 6m45s 2.6.8-rc6 + token: 4m24s This is a quick hack, implemented without having talked to the inventor of the algorithm. He's copied on the mail and I suspect we'll be able to do better than my quick implementation ... Signed-off-by:
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Aneesh Kumar authored
The below patch add the symbol information of the pc and ra to the Oops message. Signed-off-by:
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Dipankar Sarma authored
Use abstracted RCU API to dereference RCU protected data. Hides barrier details. Patch from Paul McKenney. This patch introduced an rcu_dereference() macro that replaces most uses of smp_read_barrier_depends(). The new macro has the advantage of explicitly documenting which pointers are protected by RCU -- in contrast, it is sometimes difficult to figure out which pointer is being protected by a given smp_read_barrier_depends() call. Signed-off-by:
Paul McKenney <paulmck@us.ibm.com> Signed-off-by:
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Dipankar Sarma authored
Patch from Paul for additional documentation of api. Updated based on feedback, and to apply to 2.6.8-rc3. I will be adding more detailed documentation to the Documentation directory in a separate patch. Signed-off-by:
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Dipankar Sarma authored
Use call_rcu_bh() in route cache. This allows faster grace periods and avoids dst cache overflows during DoS testing. This patch uses the call_rcu_bh() api in route cache code to facilitate quicker RCU grace periods. Quicker grace periods avoid overflow of dst cache in heavily loaded routers as seen in Robert Olsson's testing. Signed-off-by:
Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by:
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Dipankar Sarma authored
Introduces call_rcu_bh() to be used when critical sections are mostly in softirq context. This patch introduces a new api - call_rcu_bh(). This is to be used for RCU callbacks for whom the critical sections are mostly in softirq context. These callbacks consider completion of a softirq handler to be a quiescent state. So, in order to make reader critical sections safe in process context, rcu_read_lock_bh() and rcu_read_unlock_bh() must be used. Use of softirq handler completion as a quiescent state speeds up RCU grace periods and prevents too many callbacks getting queued up in softirq-heavy workloads like network stack. Signed-off-by:
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Dipankar Sarma authored
Somehow spaces replaced tabs in rcupdate.h and I would like to keep everything clean. Signed-off-by:
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Dipankar Sarma authored
Avoids per_cpu calculations and also prepares for call_rcu_bh(). At OLS, Rusty had suggested getting rid of many per_cpu() calculations in RCU code and making the code simpler. I had already done that for the rcu-softirq patch earlier, so I am splitting that into two patch. This first patch cleans up the macros and uses pointers to the rcu per-cpu data directly to manipulate the callback queues. This is useful for the call-rcu-bh patch (to follow) which introduces a new RCU mechanism - call_rcu_bh(). Both generic and softirq rcu can then use the same code, they work different global and percpu data. Signed-off-by:
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Dipankar Sarma authored
This patch makes RCU callbacks friendly to scheduler. It helps low latency by limiting the number of callbacks invoked per tasklet handler. Since we cannot schedule during a single softirq handler, this reduces size of non-preemptible section significantly, specially under heavy RCU updates. The limiting is done through a kernel parameter rcupdate.maxbatch which is the maximum number of RCU callbacks to invoke during a single tasklet handler. Signed-off-by:
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Dipankar Sarma authored
This fixes the RCU cpu offline code which was broken by singly-linked RCU changes. Nathan pointed out the problems and submitted a patch for this. This is an optimal fix - no need to iterate through the list of callbacks, just use the tail pointers and attach the list from the dead cpu. Signed-off-by:
Nathan Lynch <nathanl@austin.ibm.com> Signed-off-by:
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Dipankar Sarma authored
There is a series of patches in my tree and these 3 are the first ones that should probably be merged down the road. Descriptions are on top of the patches. Please include them in -mm. A lot of RCU code will be cleaned up later in order to support call_rcu_bh(), the separate RCU interface that considers softirq handler completion a quiescent state. This patch: Minor cleanup of the hotplug code to remove #ifdef in cpu event notifier handler. If CONFIG_HOTPLUG_CPU is not defined, CPU_DEAD case will be optimized off. Signed-off-by:
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