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2012-10-05rtc: fix overflow in mktimegmPaolo Bonzini1-1/+1
When setting a date in 1980, Linux is actually disregarding the century byte and setting the year to 2080. This causes a year-2038 overflow in mktimegm. Fix this by doing the days-to-seconds computation in 64-bit math. Reported-by: Lucas Meneghel Rodrigues <lookkas@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-15block: Enable qemu_open/close to work with fd setsCorey Bryant1-0/+5
When qemu_open is passed a filename of the "/dev/fdset/nnn" format (where nnn is the fdset ID), an fd with matching access mode flags will be searched for within the specified monitor fd set. If the fd is found, a dup of the fd will be returned from qemu_open. Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-08Add uleb encoding/decoding functionsOrit Wasserman1-0/+33
Implement Unsigned Little Endian Base 128. Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add cache handling functionsOrit Wasserman1-0/+9
Add MRU page cache mechanism. The page are accessed by their address. Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com> Signed-off-by: Petter Svard <petters@cs.umu.se> Signed-off-by: Aidan Shribman <aidan.shribman@sap.com> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-07-26cutils: add strpadcpy()Dmitry Fleytman1-0/+7
Signed-off-by: Yan Vugenfirer <yan@ravellosystems.com> Signed-off-by: Dmitry Fleytman <dmitry.fleytman@ravellosystems.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-06-11rewrite iov_send_recv() and move it to iov.cMichael Tokarev1-83/+0
Make it much more understandable, add a missing iov_cnt argument (number of iovs in the iov), and add comments to it. The new implementation has been extensively tested by splitting a large buffer into many small randomly-sized chunks, sending it over socket to another, slow process and verifying the receiving data is the same. Also add a unit test for iov_send_recv(), sending/ receiving data between two processes over a socketpair using random vectors and random sizes. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11export iov_send_recv() and use it in iov_send() and iov_recv()Michael Tokarev1-14/+3
Rename do_sendv_recvv() to iov_send_recv(), change its last arg (do_send) from int to bool, export it in iov.h, and made the two callers of it (iov_send() and iov_recv()) to be trivial #defines just adding 5th arg. iov_send_recv() will be used later. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11rename qemu_sendv to iov_send, change proto and move declarations to iov.hMichael Tokarev1-28/+13
Rename arguments and use size_t for sizes instead of int, from int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset) to ssize_t iov_send(int sockfd, struct iovec *iov, size_t offset, size_t bytes) The main motivation was to make it clear that length and offset are in _bytes_, not in iov elements: it was very confusing before, because all standard functions which deals with iovecs expects number of iovs, not bytes, even the fact that struct iovec has iov_len and iov_ prefix does not help. With "bytes" and "offset", especially since they're now size_t, it is much more explicit. Also change the return type to be ssize_t instead of int. This also changes it to match other iov-related functons, but not _quite_: there's still no argument indicating where iovec ends, ie, no iov_cnt parameter as used in iov_size() and friends. If will be added in subsequent patch/rewrite. All callers of qemu_sendv() and qemu_recvv() and related, like qemu_co_sendv() and qemu_co_recvv(), were checked to verify that it is safe to use unsigned datatype instead of int. Note that the order of arguments is changed to: offset and bytes (len and iov_offset) are swapped with each other. This is to make them consistent with very similar functions from qemu_iovec family, where offset always follows qiov, to mean the place in it to start from. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11change qemu_iovec_to_buf() to match other to,from_buf functionsMichael Tokarev1-8/+3
It now allows specifying offset within qiov to start from and amount of bytes to copy. Actual implementation is just a call to iov_to_buf(). Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11consolidate qemu_iovec_copy() and qemu_iovec_concat() and make them consistentMichael Tokarev1-34/+20
qemu_iovec_concat() is currently a wrapper for qemu_iovec_copy(), use the former (with extra "0" arg) in a few places where it is used. Change skip argument of qemu_iovec_copy() from uint64_t to size_t, since size of qiov itself is size_t, so there's no way to skip larger sizes. Rename it to soffset, to make it clear that the offset is applied to src. Also change the only usage of uint64_t in hw/9pfs/virtio-9p.c, in v9fs_init_qiov_from_pdu() - all callers of it actually uses size_t too, not uint64_t. One added restriction: as for all other iovec-related functions, soffset must point inside src. Order of argumens is already good: qemu_iovec_memset(QEMUIOVector *qiov, size_t offset, int c, size_t bytes) vs: qemu_iovec_concat(QEMUIOVector *dst, QEMUIOVector *src, size_t soffset, size_t sbytes) (note soffset is after _src_ not dst, since it applies to src; for memset it applies to qiov). Note that in many places where this function is used, the previous call is qemu_iovec_reset(), which means many callers actually want copy (replacing dst content), not concat. So we may want to add a wrapper like qemu_iovec_copy() with the same arguments but which calls qemu_iovec_reset() before _concat(). Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11allow qemu_iovec_from_buffer() to specify offset from which to start copyingMichael Tokarev1-13/+3
Similar to qemu_iovec_memset(QEMUIOVector *qiov, size_t offset, int c, size_t bytes); the new prototype is: qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset, const void *buf, size_t bytes); The processing starts at offset bytes within qiov. This way, we may copy a bounce buffer directly to a middle of qiov. This is exactly the same function as iov_from_buf() from iov.c, so use the existing implementation and rename it to qemu_iovec_from_buf() to be shorter and to match the utility function. As with utility implementation, we now assert that the offset is inside actual iovec. Nothing changed for current callers, because `offset' parameter is new. While at it, stop using "bounce-qiov" in block/qcow2.c and copy decrypted data directly from cluster_data instead of recreating a temp qiov for doing that. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-06-11consolidate qemu_iovec_memset{,_skip}() into single function and use ↵Michael Tokarev1-40/+4
existing iov_memset() This patch combines two functions into one, and replaces the implementation with already existing iov_memset() from iov.c. The new prototype of qemu_iovec_memset(): size_t qemu_iovec_memset(qiov, size_t offset, int fillc, size_t bytes) It is different from former qemu_iovec_memset_skip(), and I want to make other functions to be consistent with it too: first how much to skip, second what, and 3rd how many of it. It also returns actual number of bytes filled in, which may be less than the requested `bytes' if qiov is smaller than offset+bytes, in the same way iov_memset() does. While at it, use utility function iov_memset() from iov.h in posix-aio-compat.c, where qiov was used. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2012-02-09cutils: extract buffer_is_zero() from qemu-img.cStefan Hajnoczi1-0/+35
The qemu-img.c:is_not_zero() function checks if a buffer contains all zeroes. This function will come in handy for zero-detection in the block layer, so clean it up and move it to cutils.c. Note that the function now returns true if the buffer is all zeroes. This avoids the double-negatives (i.e. !is_not_zero()) that the old function can cause in callers. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-12-22sheepdog: move coroutine send/recv function to generic codePaolo Bonzini1-0/+111
Outside coroutines, avoid busy waiting on EAGAIN by temporarily making the socket blocking. The API of qemu_recvv/qemu_sendv is slightly different from do_readv/do_writev because they do not handle coroutines. It returns the number of bytes written before encountering an EAGAIN. The specificity of yielding on EAGAIN is entirely in qemu-coroutine.c. Reviewed-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-12-15qiov: prevent double free or use-after-freePaolo Bonzini1-0/+3
qemu_iovec_destroy does not clear the QEMUIOVector fully, and the data could thus be used after free or freed again. While I do not know any example in the tree, I observed this using virtio-scsi (and SCSI scatter/gather) when canceling DMA requests. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-28cutils: Make strtosz & friends leave follow set to callersMarkus Armbruster1-44/+26
strtosz() & friends require the size to be at the end of the string, or be followed by whitespace or ','. I find this surprising, because the name suggests it works like strtol(). The check simplifies callers that accept exactly that follow set slightly. No such callers exist. The check is redundant for callers that accept a smaller follow set, and thus need to check themselves anyway. Right now, this is the case for all but one caller. All of them neglected to check, or checked incorrectly, but the previous few commits fixed them up. Finally, the check is problematic for callers that accept a larger follow set. This is the case in monitor_parse_command(). Fortunately, the problems there are relatively harmless. monitor_parse_command() uses strtosz() for argument type 'o'. When the last argument is of type 'o', a trailing ',' is diagnosed differently than other trailing junk: (qemu) migrate_set_speed 1x invalid size (qemu) migrate_set_speed 1, migrate_set_speed: extraneous characters at the end of line A related inconsistency exists with non-last arguments. No such command exists, but let's use memsave to explore the inconsistency. The monitor permits, but does not require whitespace between arguments. For instance, "memsave (1-1)1024foo" is parsed as command memsave with three arguments 0, 1024 and "foo". Yes, this is daft, but at least it's consistently daft. If I change memsave's second argument from 'i' to 'o', then "memsave (1-1)1foo" is rejected, because the size is followed by an 'f'. But "memsave (1-1)1," is still accepted, and duly saves to file ",". We don't have any users of strtosz that profit from the check. In the users we have, it appears to encourage sloppy error checking, or gets in the way. Drop the bothersome check. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-28cutils: Drop broken support for zero strtosz default_suffixMarkus Armbruster1-13/+4
Commit 9f9b17a4's strtosz() defaults a missing suffix to 'M', except it rejects fractions then (switch case 0). When commit d8427002 introduced strtosz_suffix(), that changed: fractions are no longer rejected, because we go to switch case 'M' on missing suffix now. Not mentioned in commit message, probably unintentional. Not worth changing back now. Because case 0 is still around, you can get the old behavior by passing a zero default_suffix to strtosz_suffix() or strtosz_suffix_unit(). Undocumented and not used. Drop. Commit d8427002 also neglected to update the function comment. Fix it up. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-01Move filedescriptor parsing code from net.c into qemu_parse_fd()Stefan Berger1-0/+12
Move the parsing of a filedescriptor into a common function qemu_parse_fd() so others can use it as well. Have net.c call this function. v2: - moving qemu_parse_fd into cutils.c Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-25Fix up some style nits of last uq/master mergeJan Kiszka1-1/+1
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-08-20Use glib memory allocation and free functionsAnthony Liguori1-3/+3
qemu_malloc/qemu_free no longer exist after this commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-08-05qemu: Add strtosz_suffix_unit functionJoerg Roedel1-5/+11
This function does the same as the strtosz_suffix function except that it allows to specify the unit to which the k/M/B/T suffixes apply. This function will be used later to parse the tsc-frequency from the command-line. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-02-10QCOW2: bug fix - read base image beyond its sizeChunqiang Tang1-0/+31
This patch fixes the following bug in QCOW2. For a QCOW2 image that is larger than its base image, when handling a read request straddling over the end of the base image, the QCOW2 driver attempts to read beyond the end of the base image and the request would fail. This bug was found by Fast Virtual Disk (FVD)'s fully automated testing tool. The following test triggered the bug. dd if=/dev/zero of=/var/ramdisk/truth.raw count=0 bs=1 seek=1098561536 dd if=/dev/zero of=/var/ramdisk/zero-500M.raw count=0 bs=1 seek=593099264 ./qemu-img create -f qcow2 -ocluster_size=65536,backing_fmt=blksim -b /var/ramdisk/zero-500M.raw /var/ramdisk/test.qcow2 1098561536 ./qemu-io --auto --seed=30477694 --truth=/var/ramdisk/truth.raw --format=qcow2 --test=blksim:/var/ramdisk/test.qcow2 --verify_write=true --compare_before=false --compare_after=true --round=100000 --parallel=100 --io_size=10485760 --fail_prob=0 --cancel_prob=0 --instant_qemubh=true Signed-off-by: Chunqiang Tang <ctang@us.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-31strtosz(): Use suffix macros in switch() statementJes Sorensen1-5/+5
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-31strtosz(): Fix name confusion in use of modf()Jes Sorensen1-2/+2
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-31strtosz() use qemu_toupper() to simplify switch statementJes Sorensen1-6/+1
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-31strtosz(): use unsigned char and switch to qemu_isspace()Jes Sorensen1-3/+4
isspace() behavior is undefined for signed char. Bug pointed out by Eric Blake, thanks! Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-01-24Make strtosz() return int64_t instead of ssize_tJes Sorensen1-4/+4
strtosz() needs to return a 64 bit type even on 32 bit architectures. Otherwise qemu-img will fail to create disk images >= 2GB Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-12-17Introduce strtosz_suffix()Jes Sorensen1-3/+14
This introduces strtosz_suffix() which allows the caller to specify a default suffix in case the non default of MB is wanted. strtosz() is kept as a wrapper for strtosz_suffix() which keeps it's current default of MB. Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-11-03Introduce strtosz() library function to convert a string to a byte count.Jes Sorensen1-0/+88
strtosz() returns -1 on error. It now supports human unit formats in eg. 1.0G, with better error handling. The following suffixes are supported: B/b = bytes K/k = KB M/m = MB G/g = GB T/t = TB This patch changes -numa and -m input to use strtosz(). Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-09-21cutils: qemu_iovec_copy and qemu_iovec_memsetKevin Wolf1-9/+41
This adds two functions that work on QEMUIOVectors and will be used by the next qcow2 patches. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2010-03-17split out qemu-timer.cPaolo Bonzini1-0/+18
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-09-20Probe for fdatasync()Blue Swirl1-1/+1
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-09-11block: use fdatasync instead of fsync if possibleChristoph Hellwig1-0/+16
If we are flushing the caches for our image files we only care about the data (including the metadata required for accessing it) but not things like timestamp updates. So try to use fdatasync instead of fsync to implement the flush operations. Unfortunately many operating systems still do not support fdatasync, so we add a qemu_fdatasync wrapper that uses fdatasync if available as per the _POSIX_SYNCHRONIZED_IO feature macro or fsync otherwise. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-09-11Add bdrv_aio_multiwriteKevin Wolf1-0/+25
One performance problem of qcow2 during the initial image growth are sequential writes that are not cluster aligned. In this case, when a first requests requires to allocate a new cluster but writes only to the first couple of sectors in that cluster, the rest of the cluster is zeroed - just to be overwritten by the following second request that fills up the cluster. Let's try to merge sequential write requests to the same cluster, so we can avoid to write the zero padding to the disk in the first place. As a nice side effect, also other formats take advantage of dealing with less and larger requests. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-07-09Revert "support colon in filenames"Anthony Liguori1-26/+0
This reverts commit 707c0dbc97cddfe8d2441b8259c6c526d99f2dd8. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-07-01Fix missing strnlen problemsBlue Swirl1-0/+13
Fix missing strnlen (a GNU extension) problems by using qemu_strnlen used for user emulators also for system emulators. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-06-29support colon in filenamesRam Pai1-0/+26
Problem: It is impossible to feed filenames with the character colon because qemu interprets such names as a protocol. For example filename scsi:0, is interpreted as a protocol by name "scsi". This patch allows user to espace colon characters. For example the above filename can now be expressed either as 'scsi\:0' or as file:scsi:0 anything following the "file:" tag is interpreted verbatin. However if "file:" tag is omitted then any colon characters in the string must be escaped using backslash. Here are couple of examples: scsi\:0\:abc is a local file scsi:0:abc http\://myweb is a local file by name http://myweb file:scsi:0:abc is a local file scsi:0:abc file:http://myweb is a local file by name http://myweb Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-05-13Include assert.h from qemu-common.hPaul Brook1-1/+0
Include assert.h from qemu-common.h and remove other direct uses. cpu-all.h still need to include it because of the dyngen-exec.h hacks Signed-off-by: Paul Brook <paul@codesourcery.com>
2009-03-28add qemu_iovec_init_external (Christoph Hellwig)aliguori1-0/+19
Allow to initialize a QEMUIOVector from an externally allocated iovec. qiov->nalloc is initialized to -1 to indicate external storage for qiov->iov and all functions dealing with memory management assert on the iovec beeing an internally managed first. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6902 c046a42c-6fe2-441c-8c8c-71466251a162
2009-02-05Add qemu_iovec_reset() (Avi Kivity)aliguori1-0/+6
Add a helper to zero out an existing iovec. Removes the need to deallocate and reallocate it. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6523 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-26qemu iovec: keep track of total size, allow partial copies (Gerd Hoffman)aliguori1-4/+11
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6448 c046a42c-6fe2-441c-8c8c-71466251a162
2009-01-22I/O vector helpers (Avi Kivity)aliguori1-0/+47
In general, it is not possible to predict the size of of an I/O vector since a contiguous guest region may map to a disconiguous host region. Add some helpers to manage I/O vector growth. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6396 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-11Rename fls to qemu_flsblueswir11-1/+1
Fix compiler warning on OSX, reported by Andreas Faerber. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5982 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-04Define fls() in terms of clz32().aliguori1-7/+2
As suggested by Laurent Desnogues. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5872 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-04Introduce fls() helperaliguori1-0/+11
This is needed for virtio. The implementation is originally from Marcelo Tosatti. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5868 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-16Attached patch fixes a series of this warningblueswir11-1/+1
when compiling on NetBSD: warning: array subscript has type 'char' Signed-off-by: Christoph Egger <Christoph.Egger@amd.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5727 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-08Revert r5532, r5536 and a piece of r5531.balrog1-12/+0
The use of strncat and strndup was correct, pstrcpy and pstrdup wasn't. I'll try to restore building on non-gnu OSes in a later commit. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5651 c046a42c-6fe2-441c-8c8c-71466251a162
2008-10-25Replace uses of strndup (a GNU extension) with Qemu pstrdupblueswir11-0/+12
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5532 c046a42c-6fe2-441c-8c8c-71466251a162
2008-06-09Prevent guest reusing host memory allocations.pbrook1-35/+0
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4710 c046a42c-6fe2-441c-8c8c-71466251a162
2008-04-11Remove osdep.c/qemu-img code duplicationaurel321-0/+35
(Kevin Wolf) git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4191 c046a42c-6fe2-441c-8c8c-71466251a162
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