)]}' { "log": [ { "commit": "6038f373a3dc1f1c26496e60b6c40b164716f07e", "tree": "a0d3bbd026eea41b9fc36b8c722cbaf56cd9f825", "parents": [ "1ec5584e3edf9c4bf2c88c846534d19cf986ba11" ], "author": { "name": "Arnd Bergmann", "email": "arnd@arndb.de", "time": "Sun Aug 15 18:52:59 2010 +0200" }, "committer": { "name": "Arnd Bergmann", "email": "arnd@arndb.de", "time": "Fri Oct 15 15:53:27 2010 +0200" }, "message": "llseek: automatically add .llseek fop\n\nAll file_operations should get a .llseek operation so we can make\nnonseekable_open the default for future file operations without a\n.llseek pointer.\n\nThe three cases that we can automatically detect are no_llseek, seq_lseek\nand default_llseek. For cases where we can we can automatically prove that\nthe file offset is always ignored, we use noop_llseek, which maintains\nthe current behavior of not returning an error from a seek.\n\nNew drivers should normally not use noop_llseek but instead use no_llseek\nand call nonseekable_open at open time. Existing drivers can be converted\nto do the same when the maintainer knows for certain that no user code\nrelies on calling seek on the device file.\n\nThe generated code is often incorrectly indented and right now contains\ncomments that clarify for each added line why a specific variant was\nchosen. In the version that gets submitted upstream, the comments will\nbe gone and I will manually fix the indentation, because there does not\nseem to be a way to do that using coccinelle.\n\nSome amount of new code is currently sitting in linux-next that should get\nthe same modifications, which I will do at the end of the merge window.\n\nMany thanks to Julia Lawall for helping me learn to write a semantic\npatch that does all this.\n\n\u003d\u003d\u003d\u003d\u003d begin semantic patch \u003d\u003d\u003d\u003d\u003d\n// This adds an llseek\u003d method to all file operations,\n// as a preparation for making no_llseek the default.\n//\n// The rules are\n// - use no_llseek explicitly if we do nonseekable_open\n// - use seq_lseek for sequential files\n// - use default_llseek if we know we access f_pos\n// - use noop_llseek if we know we don\u0027t access f_pos,\n// but we still want to allow users to call lseek\n//\n@ open1 exists @\nidentifier nested_open;\n@@\nnested_open(...)\n{\n\u003c+...\nnonseekable_open(...)\n...+\u003e\n}\n\n@ open exists@\nidentifier open_f;\nidentifier i, f;\nidentifier open1.nested_open;\n@@\nint open_f(struct inode *i, struct file *f)\n{\n\u003c+...\n(\nnonseekable_open(...)\n|\nnested_open(...)\n)\n...+\u003e\n}\n\n@ read disable optional_qualifier exists @\nidentifier read_f;\nidentifier f, p, s, off;\ntype ssize_t, size_t, loff_t;\nexpression E;\nidentifier func;\n@@\nssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)\n{\n\u003c+...\n(\n *off \u003d E\n|\n *off +\u003d E\n|\n func(..., off, ...)\n|\n E \u003d *off\n)\n...+\u003e\n}\n\n@ read_no_fpos disable optional_qualifier exists @\nidentifier read_f;\nidentifier f, p, s, off;\ntype ssize_t, size_t, loff_t;\n@@\nssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)\n{\n... when !\u003d off\n}\n\n@ write @\nidentifier write_f;\nidentifier f, p, s, off;\ntype ssize_t, size_t, loff_t;\nexpression E;\nidentifier func;\n@@\nssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)\n{\n\u003c+...\n(\n *off \u003d E\n|\n *off +\u003d E\n|\n func(..., off, ...)\n|\n E \u003d *off\n)\n...+\u003e\n}\n\n@ write_no_fpos @\nidentifier write_f;\nidentifier f, p, s, off;\ntype ssize_t, size_t, loff_t;\n@@\nssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)\n{\n... when !\u003d off\n}\n\n@ fops0 @\nidentifier fops;\n@@\nstruct file_operations fops \u003d {\n ...\n};\n\n@ has_llseek depends on fops0 @\nidentifier fops0.fops;\nidentifier llseek_f;\n@@\nstruct file_operations fops \u003d {\n...\n .llseek \u003d llseek_f,\n...\n};\n\n@ has_read depends on fops0 @\nidentifier fops0.fops;\nidentifier read_f;\n@@\nstruct file_operations fops \u003d {\n...\n .read \u003d read_f,\n...\n};\n\n@ has_write depends on fops0 @\nidentifier fops0.fops;\nidentifier write_f;\n@@\nstruct file_operations fops \u003d {\n...\n .write \u003d write_f,\n...\n};\n\n@ has_open depends on fops0 @\nidentifier fops0.fops;\nidentifier open_f;\n@@\nstruct file_operations fops \u003d {\n...\n .open \u003d open_f,\n...\n};\n\n// use no_llseek if we call nonseekable_open\n////////////////////////////////////////////\n@ nonseekable1 depends on !has_llseek \u0026\u0026 has_open @\nidentifier fops0.fops;\nidentifier nso ~\u003d \"nonseekable_open\";\n@@\nstruct file_operations fops \u003d {\n... .open \u003d nso, ...\n+.llseek \u003d no_llseek, /* nonseekable */\n};\n\n@ nonseekable2 depends on !has_llseek @\nidentifier fops0.fops;\nidentifier open.open_f;\n@@\nstruct file_operations fops \u003d {\n... .open \u003d open_f, ...\n+.llseek \u003d no_llseek, /* open uses nonseekable */\n};\n\n// use seq_lseek for sequential files\n/////////////////////////////////////\n@ seq depends on !has_llseek @\nidentifier fops0.fops;\nidentifier sr ~\u003d \"seq_read\";\n@@\nstruct file_operations fops \u003d {\n... .read \u003d sr, ...\n+.llseek \u003d seq_lseek, /* we have seq_read */\n};\n\n// use default_llseek if there is a readdir\n///////////////////////////////////////////\n@ fops1 depends on !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier readdir_e;\n@@\n// any other fop is used that changes pos\nstruct file_operations fops \u003d {\n... .readdir \u003d readdir_e, ...\n+.llseek \u003d default_llseek, /* readdir is present */\n};\n\n// use default_llseek if at least one of read/write touches f_pos\n/////////////////////////////////////////////////////////////////\n@ fops2 depends on !fops1 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier read.read_f;\n@@\n// read fops use offset\nstruct file_operations fops \u003d {\n... .read \u003d read_f, ...\n+.llseek \u003d default_llseek, /* read accesses f_pos */\n};\n\n@ fops3 depends on !fops1 \u0026\u0026 !fops2 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier write.write_f;\n@@\n// write fops use offset\nstruct file_operations fops \u003d {\n... .write \u003d write_f, ...\n+\t.llseek \u003d default_llseek, /* write accesses f_pos */\n};\n\n// Use noop_llseek if neither read nor write accesses f_pos\n///////////////////////////////////////////////////////////\n\n@ fops4 depends on !fops1 \u0026\u0026 !fops2 \u0026\u0026 !fops3 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier read_no_fpos.read_f;\nidentifier write_no_fpos.write_f;\n@@\n// write fops use offset\nstruct file_operations fops \u003d {\n...\n .write \u003d write_f,\n .read \u003d read_f,\n...\n+.llseek \u003d noop_llseek, /* read and write both use no f_pos */\n};\n\n@ depends on has_write \u0026\u0026 !has_read \u0026\u0026 !fops1 \u0026\u0026 !fops2 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier write_no_fpos.write_f;\n@@\nstruct file_operations fops \u003d {\n... .write \u003d write_f, ...\n+.llseek \u003d noop_llseek, /* write uses no f_pos */\n};\n\n@ depends on has_read \u0026\u0026 !has_write \u0026\u0026 !fops1 \u0026\u0026 !fops2 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\nidentifier read_no_fpos.read_f;\n@@\nstruct file_operations fops \u003d {\n... .read \u003d read_f, ...\n+.llseek \u003d noop_llseek, /* read uses no f_pos */\n};\n\n@ depends on !has_read \u0026\u0026 !has_write \u0026\u0026 !fops1 \u0026\u0026 !fops2 \u0026\u0026 !has_llseek \u0026\u0026 !nonseekable1 \u0026\u0026 !nonseekable2 \u0026\u0026 !seq @\nidentifier fops0.fops;\n@@\nstruct file_operations fops \u003d {\n...\n+.llseek \u003d noop_llseek, /* no read or write fn */\n};\n\u003d\u003d\u003d\u003d\u003d End semantic patch \u003d\u003d\u003d\u003d\u003d\n\nSigned-off-by: Arnd Bergmann \u003carnd@arndb.de\u003e\nCc: Julia Lawall \u003cjulia@diku.dk\u003e\nCc: Christoph Hellwig \u003chch@infradead.org\u003e\n" }, { "commit": "5a0e3ad6af8660be21ca98a971cd00f331318c05", "tree": "5bfb7be11a03176a87296a43ac6647975c00a1d1", "parents": [ "ed391f4ebf8f701d3566423ce8f17e614cde9806" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Mar 24 17:04:11 2010 +0900" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Mar 30 22:02:32 2010 +0900" }, "message": "include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h\n\npercpu.h is included by sched.h and module.h and thus ends up being\nincluded when building most .c files. percpu.h includes slab.h which\nin turn includes gfp.h making everything defined by the two files\nuniversally available and complicating inclusion dependencies.\n\npercpu.h -\u003e slab.h dependency is about to be removed. Prepare for\nthis change by updating users of gfp and slab facilities include those\nheaders directly instead of assuming availability. As this conversion\nneeds to touch large number of source files, the following script is\nused as the basis of conversion.\n\n http://userweb.kernel.org/~tj/misc/slabh-sweep.py\n\nThe script does the followings.\n\n* Scan files for gfp and slab usages and update includes such that\n only the necessary includes are there. ie. if only gfp is used,\n gfp.h, if slab is used, slab.h.\n\n* When the script inserts a new include, it looks at the include\n blocks and try to put the new include such that its order conforms\n to its surrounding. It\u0027s put in the include block which contains\n core kernel includes, in the same order that the rest are ordered -\n alphabetical, Christmas tree, rev-Xmas-tree or at the end if there\n doesn\u0027t seem to be any matching order.\n\n* If the script can\u0027t find a place to put a new include (mostly\n because the file doesn\u0027t have fitting include block), it prints out\n an error message indicating which .h file needs to be added to the\n file.\n\nThe conversion was done in the following steps.\n\n1. The initial automatic conversion of all .c files updated slightly\n over 4000 files, deleting around 700 includes and adding ~480 gfp.h\n and ~3000 slab.h inclusions. The script emitted errors for ~400\n files.\n\n2. Each error was manually checked. Some didn\u0027t need the inclusion,\n some needed manual addition while adding it to implementation .h or\n embedding .c file was more appropriate for others. This step added\n inclusions to around 150 files.\n\n3. The script was run again and the output was compared to the edits\n from #2 to make sure no file was left behind.\n\n4. Several build tests were done and a couple of problems were fixed.\n e.g. lib/decompress_*.c used malloc/free() wrappers around slab\n APIs requiring slab.h to be added manually.\n\n5. The script was run on all .h files but without automatically\n editing them as sprinkling gfp.h and slab.h inclusions around .h\n files could easily lead to inclusion dependency hell. Most gfp.h\n inclusion directives were ignored as stuff from gfp.h was usually\n wildly available and often used in preprocessor macros. Each\n slab.h inclusion directive was examined and added manually as\n necessary.\n\n6. percpu.h was updated not to include slab.h.\n\n7. Build test were done on the following configurations and failures\n were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my\n distributed build env didn\u0027t work with gcov compiles) and a few\n more options had to be turned off depending on archs to make things\n build (like ipr on powerpc/64 which failed due to missing writeq).\n\n * x86 and x86_64 UP and SMP allmodconfig and a custom test config.\n * powerpc and powerpc64 SMP allmodconfig\n * sparc and sparc64 SMP allmodconfig\n * ia64 SMP allmodconfig\n * s390 SMP allmodconfig\n * alpha SMP allmodconfig\n * um on x86_64 SMP allmodconfig\n\n8. percpu.h modifications were reverted so that it could be applied as\n a separate patch and serve as bisection point.\n\nGiven the fact that I had only a couple of failures from tests on step\n6, I\u0027m fairly confident about the coverage of this conversion patch.\nIf there is a breakage, it\u0027s likely to be something in one of the arch\nheaders which should be easily discoverable easily on most builds of\nthe specific arch.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nGuess-its-ok-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Ingo Molnar \u003cmingo@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\n" }, { "commit": "cb289d6244a37cf932c571d6deb0daa8030f931b", "tree": "05bea15a25c9d9a4dcc0658a6a8bf845daca535a", "parents": [ "a6085fbaf65ab09bfb5ec8d902d6d21680fe1895" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Wed Jan 13 09:34:36 2010 -0800" }, "committer": { "name": "Marcelo Tosatti", "email": "mtosatti@redhat.com", "time": "Mon Jan 25 12:26:38 2010 -0200" }, "message": "eventfd - allow atomic read and waitqueue remove\n\nKVM needs a wait to atomically remove themselves from the eventfd -\u003epoll()\nwait queue head, in order to handle correctly their IRQfd deassign\noperation.\n\nThis patch introduces such API, plus a way to read an eventfd from its\ncontext.\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nSigned-off-by: Avi Kivity \u003cavi@redhat.com\u003e\n" }, { "commit": "628ff7c1d8d8466a5ad8078bd0206a130f8b8a51", "tree": "cc7ab0c90849be38e200fc6ff6a3a09e3caf0405", "parents": [ "ed2617585f39dd12fae38c657bba68b9779ea10d" ], "author": { "name": "Roland Dreier", "email": "rdreier@cisco.com", "time": "Fri Dec 18 09:41:24 2009 -0800" }, "committer": { "name": "Al Viro", "email": "viro@zeniv.linux.org.uk", "time": "Tue Dec 22 12:27:34 2009 -0500" }, "message": "anonfd: Allow making anon files read-only\n\nIt seems a couple places such as arch/ia64/kernel/perfmon.c and\ndrivers/infiniband/core/uverbs_main.c could use anon_inode_getfile()\ninstead of a private pseudo-fs + alloc_file(), if only there were a way\nto get a read-only file. So provide this by having anon_inode_getfile()\ncreate a read-only file if we pass O_RDONLY in flags.\n\nSigned-off-by: Roland Dreier \u003crolandd@cisco.com\u003e\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\n" }, { "commit": "562787a5c32ccdf182de27793a83a9f2ee86cd77", "tree": "3308afd59d3b7449afa3d6a6cd624d06ce035e88", "parents": [ "515350b6fd041396f425180589e08812dd13615f" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Tue Sep 22 16:43:57 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Sep 23 07:39:29 2009 -0700" }, "message": "anonfd: split interface into file creation and install\n\nSplit the anonfd interface into a bare file pointer creation one, and a\nfile pointer creation plus install one.\n\nThere are cases, like the usage of eventfds inside other kernel\ninterfaces, where the file pointer created by anonfd needs to be used\ninside the initialization of other structures.\n\nAs it is right now, as soon as anon_inode_getfd() returns, the kenrle can\nrace with userspace closing the newly installed file descriptor.\n\nThis patch, while keeping the old anon_inode_getfd(), introduces a new\nanon_inode_getfile() (whose services are reused in anon_inode_getfd())\nthat allows to split the file creation phase and the fd install one.\n\nOnce all the kernel structures are initialized, the code can call the\nproper fd_install().\n\nGregory manifested the need for something like this inside KVM.\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Alexander Viro \u003cviro@zeniv.linux.org.uk\u003e\nCc: James Morris \u003cjmorris@namei.org\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: Gregory Haskins \u003cghaskins@novell.com\u003e\nAcked-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nAcked-by: Roland Dreier \u003crolandd@cisco.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "133890103b9de08904f909995973e4b5c08a780e", "tree": "0cda85a58dafafa0a197cf1a789124203f1e7a88", "parents": [ "f7c2df9b55212d5ec94169a4de11e44c683e0af4" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Tue Jun 30 11:41:11 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jun 30 18:55:58 2009 -0700" }, "message": "eventfd: revised interface and cleanups\n\nChange the eventfd interface to de-couple the eventfd memory context, from\nthe file pointer instance.\n\nWithout such change, there is no clean way to racely free handle the\nPOLLHUP event sent when the last instance of the file* goes away. Also,\nnow the internal eventfd APIs are using the eventfd context instead of the\nfile*.\n\nThis patch is required by KVM\u0027s IRQfd code, which is still under\ndevelopment.\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Gregory Haskins \u003cghaskins@novell.com\u003e\nCc: Rusty Russell \u003crusty@rustcorp.com.au\u003e\nCc: Benjamin LaHaise \u003cbcrl@kvack.org\u003e\nCc: Avi Kivity \u003cavi@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "5718607bb670c721f45f0dbb1cc7d6c64969aab1", "tree": "9b595af2cd4649bea4c130b9dc223a5f886c34d2", "parents": [ "9f155a9b3d5a5444bcc5e049ec2547bb5107150e" ], "author": { "name": "Rusty Russell", "email": "rusty@rustcorp.com.au", "time": "Fri Jun 12 22:27:09 2009 -0600" }, "committer": { "name": "Rusty Russell", "email": "rusty@rustcorp.com.au", "time": "Fri Jun 12 22:27:09 2009 +0930" }, "message": "eventfd: export eventfd_signal and eventfd_fget for lguest\n\nlguest wants to attach eventfds to guest notifications, and lguest is\nusually a module.\n\nSigned-off-by: Rusty Russell \u003crusty@rustcorp.com.au\u003e\nTo: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\n" }, { "commit": "395108880efff4a4ffa1ffa554477f7f5ba6a031", "tree": "7d5797145d54b6cd8752eb2a6b1fd934336a005f", "parents": [ "2dfa4eeab0fc7e8633974f2770945311b31eedf6" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Tue Mar 31 15:24:23 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Apr 01 08:59:20 2009 -0700" }, "message": "epoll keyed wakeups: make eventfd use keyed wakeups\n\nIntroduce keyed event wakeups inside the eventfd code.\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Alan Cox \u003calan@lxorguk.ukuu.org.uk\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: David Miller \u003cdavem@davemloft.net\u003e\nCc: William Lee Irwin III \u003cwli@movementarian.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "bcd0b235bf3808dec5115c381cd55568f63b85f0", "tree": "d73c4aa83dcd5321d2c48e070020576098b9705e", "parents": [ "4f0989dbfa8d18dd17c32120aac1eb3e906a62a2" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Tue Mar 31 15:24:18 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Apr 01 08:59:20 2009 -0700" }, "message": "eventfd: improve support for semaphore-like behavior\n\nPeople started using eventfd in a semaphore-like way where before they\nwere using pipes.\n\nThat is, counter-based resource access. Where a \"wait()\" returns\nimmediately by decrementing the counter by one, if counter is greater than\nzero. Otherwise will wait. And where a \"post(count)\" will add count to\nthe counter releasing the appropriate amount of waiters. If eventfd the\n\"post\" (write) part is fine, while the \"wait\" (read) does not dequeue 1,\nbut the whole counter value.\n\nThe problem with eventfd is that a read() on the fd returns and wipes the\nwhole counter, making the use of it as semaphore a little bit more\ncumbersome. You can do a read() followed by a write() of COUNTER-1, but\nIMO it\u0027s pretty easy and cheap to make this work w/out extra steps. This\npatch introduces a new eventfd flag that tells eventfd to only dequeue 1\nfrom the counter, allowing simple read/write to make it behave like a\nsemaphore. Simple test here:\n\nhttp://www.xmailserver.org/eventfd-sem.c\n\nTo be back-compatible with earlier kernels, userspace applications should\nprobe for the availability of this feature via\n\n#ifdef EFD_SEMAPHORE\n\tfd \u003d eventfd2 (CNT, EFD_SEMAPHORE);\n\tif (fd \u003d\u003d -1 \u0026\u0026 errno \u003d\u003d EINVAL)\n\t\t\u003cfallback\u003e\n#else\n\t\t\u003cfallback\u003e\n#endif\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: \u003clinux-api@vger.kernel.org\u003e\nTested-by: Michael Kerrisk \u003cmtk.manpages@gmail.com\u003e\nCc: Ulrich Drepper \u003cdrepper@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d4e82042c4cfa87a7d51710b71f568fe80132551", "tree": "202c311b52f4e4db9fbbbd80607744e2aa2e5885", "parents": [ "836f92adf121f806e9beb5b6b88bd5c9c4ea3f24" ], "author": { "name": "Heiko Carstens", "email": "heiko.carstens@de.ibm.com", "time": "Wed Jan 14 14:14:34 2009 +0100" }, "committer": { "name": "Heiko Carstens", "email": "heiko.carstens@de.ibm.com", "time": "Wed Jan 14 14:15:31 2009 +0100" }, "message": "[CVE-2009-0029] System call wrappers part 32\n\nSigned-off-by: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\n" }, { "commit": "e38b36f325153eaadd1c2a7abc5762079233e540", "tree": "92cfc9855e41c5328d91456f5e373c00ecb8d383", "parents": [ "510df2dd482496083e1c3b1a8c9b6afd5fa4c7d7" ], "author": { "name": "Ulrich Drepper", "email": "drepper@redhat.com", "time": "Wed Jul 23 21:29:42 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:29 2008 -0700" }, "message": "flag parameters: check magic constants\n\nThis patch adds test that ensure the boundary conditions for the various\nconstants introduced in the previous patches is met. No code is generated.\n\n[akpm@linux-foundation.org: fix alpha]\nSigned-off-by: Ulrich Drepper \u003cdrepper@redhat.com\u003e\nAcked-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Michael Kerrisk \u003cmtk.manpages@googlemail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e7d476dfdf0bcfed478a207aecfdc84f81efecaf", "tree": "8adc7f4cf562cd0e283d4abdaa0633686a59d8b2", "parents": [ "5fb5e04926a54bc1c22bba7ca166840f4476196f" ], "author": { "name": "Ulrich Drepper", "email": "drepper@redhat.com", "time": "Wed Jul 23 21:29:38 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:29 2008 -0700" }, "message": "flag parameters: NONBLOCK in eventfd\n\nThis patch adds support for the EFD_NONBLOCK flag to eventfd2. The\nadditional changes needed are minimal.\n\nThe following test must be adjusted for architectures other than x86 and\nx86-64 and in case the syscall numbers changed.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n#include \u003cfcntl.h\u003e\n#include \u003cstdio.h\u003e\n#include \u003cunistd.h\u003e\n#include \u003csys/syscall.h\u003e\n\n#ifndef __NR_eventfd2\n# ifdef __x86_64__\n# define __NR_eventfd2 290\n# elif defined __i386__\n# define __NR_eventfd2 328\n# else\n# error \"need __NR_eventfd2\"\n# endif\n#endif\n\n#define EFD_NONBLOCK O_NONBLOCK\n\nint\nmain (void)\n{\n int fd \u003d syscall (__NR_eventfd2, 1, 0);\n if (fd \u003d\u003d -1)\n {\n puts (\"eventfd2(0) failed\");\n return 1;\n }\n int fl \u003d fcntl (fd, F_GETFL);\n if (fl \u003d\u003d -1)\n {\n puts (\"fcntl failed\");\n return 1;\n }\n if (fl \u0026 O_NONBLOCK)\n {\n puts (\"eventfd2(0) sets non-blocking mode\");\n return 1;\n }\n close (fd);\n\n fd \u003d syscall (__NR_eventfd2, 1, EFD_NONBLOCK);\n if (fd \u003d\u003d -1)\n {\n puts (\"eventfd2(EFD_NONBLOCK) failed\");\n return 1;\n }\n fl \u003d fcntl (fd, F_GETFL);\n if (fl \u003d\u003d -1)\n {\n puts (\"fcntl failed\");\n return 1;\n }\n if ((fl \u0026 O_NONBLOCK) \u003d\u003d 0)\n {\n puts (\"eventfd2(EFD_NONBLOCK) does not set non-blocking mode\");\n return 1;\n }\n close (fd);\n\n puts (\"OK\");\n\n return 0;\n}\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nSigned-off-by: Ulrich Drepper \u003cdrepper@redhat.com\u003e\nAcked-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Michael Kerrisk \u003cmtk.manpages@googlemail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b087498eb5605673b0f260a7620d91818cd72304", "tree": "977d9dbcd326a9582dfc5ad000995d26886c872e", "parents": [ "9deb27baedb79759c3ab9435a7d8b841842d56e9" ], "author": { "name": "Ulrich Drepper", "email": "drepper@redhat.com", "time": "Wed Jul 23 21:29:25 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:27 2008 -0700" }, "message": "flag parameters: eventfd\n\nThis patch adds the new eventfd2 syscall. It extends the old eventfd\nsyscall by one parameter which is meant to hold a flag value. In this\npatch the only flag support is EFD_CLOEXEC which causes the close-on-exec\nflag for the returned file descriptor to be set.\n\nA new name EFD_CLOEXEC is introduced which in this implementation must\nhave the same value as O_CLOEXEC.\n\nThe following test must be adjusted for architectures other than x86 and\nx86-64 and in case the syscall numbers changed.\n\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n#include \u003cfcntl.h\u003e\n#include \u003cstdio.h\u003e\n#include \u003cunistd.h\u003e\n#include \u003csys/syscall.h\u003e\n\n#ifndef __NR_eventfd2\n# ifdef __x86_64__\n# define __NR_eventfd2 290\n# elif defined __i386__\n# define __NR_eventfd2 328\n# else\n# error \"need __NR_eventfd2\"\n# endif\n#endif\n\n#define EFD_CLOEXEC O_CLOEXEC\n\nint\nmain (void)\n{\n int fd \u003d syscall (__NR_eventfd2, 1, 0);\n if (fd \u003d\u003d -1)\n {\n puts (\"eventfd2(0) failed\");\n return 1;\n }\n int coe \u003d fcntl (fd, F_GETFD);\n if (coe \u003d\u003d -1)\n {\n puts (\"fcntl failed\");\n return 1;\n }\n if (coe \u0026 FD_CLOEXEC)\n {\n puts (\"eventfd2(0) sets close-on-exec flag\");\n return 1;\n }\n close (fd);\n\n fd \u003d syscall (__NR_eventfd2, 1, EFD_CLOEXEC);\n if (fd \u003d\u003d -1)\n {\n puts (\"eventfd2(EFD_CLOEXEC) failed\");\n return 1;\n }\n coe \u003d fcntl (fd, F_GETFD);\n if (coe \u003d\u003d -1)\n {\n puts (\"fcntl failed\");\n return 1;\n }\n if ((coe \u0026 FD_CLOEXEC) \u003d\u003d 0)\n {\n puts (\"eventfd2(EFD_CLOEXEC) does not set close-on-exec flag\");\n return 1;\n }\n close (fd);\n\n puts (\"OK\");\n\n return 0;\n}\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n[akpm@linux-foundation.org: add sys_ni stub]\nSigned-off-by: Ulrich Drepper \u003cdrepper@redhat.com\u003e\nAcked-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Michael Kerrisk \u003cmtk.manpages@googlemail.com\u003e\nCc: \u003clinux-arch@vger.kernel.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "7d9dbca34240ebb6ff88d8a29c6c7bffd098f0c1", "tree": "7e3226a4d885f5e4444fbe01a08c51b0b33b2cc7", "parents": [ "c019bbc612f6633ede7ed67725cbf68de45ae8a4" ], "author": { "name": "Ulrich Drepper", "email": "drepper@redhat.com", "time": "Wed Jul 23 21:29:22 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jul 24 10:47:27 2008 -0700" }, "message": "flag parameters: anon_inode_getfd extension\n\nThis patch just extends the anon_inode_getfd interface to take an additional\nparameter with a flag value. The flag value is passed on to\nget_unused_fd_flags in anticipation for a use with the O_CLOEXEC flag.\n\nNo actual semantic changes here, the changed callers all pass 0 for now.\n\n[akpm@linux-foundation.org: KVM fix]\nSigned-off-by: Ulrich Drepper \u003cdrepper@redhat.com\u003e\nAcked-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nCc: Michael Kerrisk \u003cmtk.manpages@googlemail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "2030a42cecd4dd1985a2ab03e25f3cd6106a5ca8", "tree": "7cb4710c3f7a4e034a20890f0df99bc42f9bbcee", "parents": [ "9f3acc3140444a900ab280de942291959f0f615d" ], "author": { "name": "Al Viro", "email": "viro@zeniv.linux.org.uk", "time": "Sat Feb 23 06:46:49 2008 -0500" }, "committer": { "name": "Al Viro", "email": "viro@zeniv.linux.org.uk", "time": "Thu May 01 13:08:50 2008 -0400" }, "message": "[PATCH] sanitize anon_inode_getfd()\n\na) none of the callers even looks at inode or file returned by anon_inode_getfd()\nb) any caller that would try to look at those would be racy, since by the time\nit returns we might have raced with close() from another thread and that\nfile would be pining for fjords.\n\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\n" }, { "commit": "7747cdb2f8302c2e1121f6d604b62a060fb04603", "tree": "c8d99c14aceea53f790e8769f0c60fc592b8de07", "parents": [ "7ec37dfd4d282ce132dcb048398800951f6d11ef" ], "author": { "name": "Adrian Bunk", "email": "bunk@kernel.org", "time": "Wed Feb 06 01:36:49 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Wed Feb 06 10:41:03 2008 -0800" }, "message": "fs/eventfd.c should #include \u003clinux/syscalls.h\u003e\n\nEvery file should include the headers containing the prototypes for its global\nfunctions (in this case sys_eventfd()).\n\nSigned-off-by: Adrian Bunk \u003cbunk@kernel.org\u003e\nCc: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d48eb2331595224ffe89665e79721d44b40bb047", "tree": "b4e398ec71e0775a441329b60cb0771c43e92c54", "parents": [ "347b4599dd6ffef27e18c227532d1ec66556000b" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Fri May 18 12:02:33 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Fri May 18 13:09:34 2007 -0700" }, "message": "eventfd use waitqueue lock ...\n\nThe eventfd was using the unlocked waitqueue operations, but it was\nusing a different lock, so poll_wait() would race with it.\n\nThis makes eventfd directly use the waitqueue lock.\n\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e1ad7468c77ddb94b0615d5f50fa255525fde0f0", "tree": "856be1a028fece7e1fa10b7b585096839913fe2e", "parents": [ "83f5d1266926c75890f1bc4678e49d79483cb573" ], "author": { "name": "Davide Libenzi", "email": "davidel@xmailserver.org", "time": "Thu May 10 22:23:19 2007 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@woody.linux-foundation.org", "time": "Fri May 11 08:29:36 2007 -0700" }, "message": "signal/timer/event: eventfd core\n\nThis is a very simple and light file descriptor, that can be used as event\nwait/dispatch by userspace (both wait and dispatch) and by the kernel\n(dispatch only). It can be used instead of pipe(2) in all cases where those\nwould simply be used to signal events. Their kernel overhead is much lower\nthan pipes, and they do not consume two fds. When used in the kernel, it can\noffer an fd-bridge to enable, for example, functionalities like KAIO or\nsyslets/threadlets to signal to an fd the completion of certain operations.\nBut more in general, an eventfd can be used by the kernel to signal readiness,\nin a POSIX poll/select way, of interfaces that would otherwise be incompatible\nwith it. The API is:\n\nint eventfd(unsigned int count);\n\nThe eventfd API accepts an initial \"count\" parameter, and returns an eventfd\nfd. It supports poll(2) (POLLIN, POLLOUT, POLLERR), read(2) and write(2).\n\nThe POLLIN flag is raised when the internal counter is greater than zero.\n\nThe POLLOUT flag is raised when at least a value of \"1\" can be written to the\ninternal counter.\n\nThe POLLERR flag is raised when an overflow in the counter value is detected.\n\nThe write(2) operation can never overflow the counter, since it blocks (unless\nO_NONBLOCK is set, in which case -EAGAIN is returned).\n\nBut the eventfd_signal() function can do it, since it\u0027s supposed to not sleep\nduring its operation.\n\nThe read(2) function reads the __u64 counter value, and reset the internal\nvalue to zero. If the value read is equal to (__u64) -1, an overflow happened\non the internal counter (due to 2^64 eventfd_signal() posts that has never\nbeen retired - unlickely, but possible).\n\nThe write(2) call writes an __u64 count value, and adds it to the current\ncounter. The eventfd fd supports O_NONBLOCK also.\n\nOn the kernel side, we have:\n\nstruct file *eventfd_fget(int fd);\nint eventfd_signal(struct file *file, unsigned int n);\n\nThe eventfd_fget() should be called to get a struct file* from an eventfd fd\n(this is an fget() + check of f_op being an eventfd fops pointer).\n\nThe kernel can then call eventfd_signal() every time it wants to post an event\nto userspace. The eventfd_signal() function can be called from any context.\nAn eventfd() simple test and bench is available here:\n\nhttp://www.xmailserver.org/eventfd-bench.c\n\nThis is the eventfd-based version of pipetest-4 (pipe(2) based):\n\nhttp://www.xmailserver.org/pipetest-4.c\n\nNot that performance matters much in the eventfd case, but eventfd-bench\nshows almost as double as performance than pipetest-4.\n\n[akpm@linux-foundation.org: fix i386 build]\n[akpm@linux-foundation.org: add sys_eventfd to sys_ni.c]\nSigned-off-by: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" } ] }