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2014-05-28block/vvfat: Propagate errors through init_directories()Markus Armbruster
Completes the conversion of the open method to Error started in commit 015a103. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-28block/vvfat: Propagate errors through enable_write_target()Markus Armbruster
Continues the conversion of the open method to Error started in commit 015a103. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-05-28block: Use bdrv_set_backing_hd everywhereFam Zheng
We need to handle the coming backing_blocker properly, so don't open code the assignment, instead, call bdrv_set_backing_hd to change backing_hd. Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-04-22block: Add errp to bdrv_new()Kevin Wolf
This patch adds an errp parameter to bdrv_new() and updates all its callers. The next patches will make use of this in order to check for duplicate IDs. Most of the callers know that their ID is fine, so they can simply assert that there is no error. Behaviour doesn't change with this patch yet as bdrv_new() doesn't actually assign errors to errp. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2014-04-01vvfat: Fix :floppy: option to suppress partition tableMarkus Armbruster
Regressed in commit 7ad9be6, v1.5.0. Reported-by: Kiyokazu SUTO <suto@ks-and-ks.ne.jp> Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-02-21vvfat: correctly propagate errorsPaolo Bonzini
Before: $ ./qemu-io-old qemu-io-old> open -r -o driver=vvfat,fat-type=24,dir=i386-softmmu Valid FAT types are only 12, 16 and 32 qemu-io-old: can't open device (null): Could not open image: Invalid argument After: $ ./qemu-io qemu-io> open -r -o driver=vvfat,fat-type=24,dir=i386-softmmu qemu-io: can't open device (null): Valid FAT types are only 12, 16 and 32 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-21block: Add reference parameter to bdrv_open()Max Reitz
Allow bdrv_open() to handle references to existing block devices just as bdrv_file_open() is already capable of. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-21block: Change BDS parameter of bdrv_open() to **Max Reitz
Make bdrv_open() take a pointer to a BDS pointer, similarly to bdrv_file_open(). If a pointer to a NULL pointer is given, bdrv_open() will create a new BDS with an empty name; if the BDS pointer is not NULL, that existing BDS will be reused (in the same way as bdrv_open() already did). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-02-17Use error_is_set() only when necessaryMarkus Armbruster
error_is_set(&var) is the same as var != NULL, but it takes whole-program analysis to figure that out. Unnecessarily hard for optimizers, static checkers, and human readers. Dumb it down to obvious. Gets rid of several dozen Coverity false positives. Note that the obvious form is already used in many places. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-01-06qemu-option: Remove qemu_opts_create_nofailPeter Crosthwaite
This is a boiler-plate _nofail variant of qemu_opts_create. Remove and use error_abort in call sites. null/0 arguments needs to be added for the id and fail_if_exists fields in affected callsites due to argument inconsistency between the normal and no_fail variants. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-12-13block/vvfat: Fix compiler warnings for OpenBSDStefan Weil
The buildbot shows these compiler warnings: block/vvfat.c: In function 'create_short_and_long_name': block/vvfat.c:620: warning: array size (8) smaller than bound length (11) block/vvfat.c:620: warning: array size (8) smaller than bound length (11) block/vvfat.c:635: warning: array size (8) smaller than bound length (11) block/vvfat.c:635: warning: array size (8) smaller than bound length (11) They are caused by tricky code where 8 characters for the name are followed by 3 characters for the extension, and some operations touch both name and extension. Using an 11 character name which includes the extension fixes the compiler warning, satisfies cppcheck, valgrind and maybe other static and dynamic code checkers, and even simplifies some parts of the code. Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2013-09-12block: Error parameter for create functionsMax Reitz
Add an Error ** parameter to bdrv_create and its associated functions to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-12block: Error parameter for open functionsMax Reitz
Add an Error ** parameter to bdrv_open, bdrv_file_open and associated functions to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-12bdrv: Use "Error" for opening imagesMax Reitz
Add an Error ** parameter to BlockDriver.bdrv_open and BlockDriver.bdrv_file_open to allow more specific error messages. Signed-off-by: Max Reitz <mreitz@redhat.com>
2013-09-06block: return get_block_status data and flags for formatsPaolo Bonzini
Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-06block: introduce bdrv_get_block_status APIPaolo Bonzini
For now, bdrv_get_block_status is just another name for bdrv_is_allocated. The next patches will add more flags. This also touches all block drivers with a mostly mechanical rename. The sole exception is cow; because it calls cow_co_is_allocated from the read code, we keep that function and make cow_co_get_block_status a wrapper. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-06block: make bdrv_delete() staticFam Zheng
Manage BlockDriverState lifecycle with refcnt, so bdrv_delete() is no longer public and should be called by bdrv_unref() if refcnt is decreased to 0. This is an identical change because effectively, there's no multiple reference of BDS now: no caller of bdrv_ref() yet, only bdrv_new() sets bs->refcnt to 1, so all bdrv_unref() now actually delete the BDS. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-09-06vvfat: use bdrv_new() to allocate BlockDriverStateFam Zheng
we need bdrv_new() to properly initialize BDS, don't allocate memory manually. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-19block: fix vvfat error path for enable_write_targetFam Zheng
s->qcow and s->qcow_filename are allocated but not freed on error. Fix the possible leaks, remove unnecessary check for bdrv_new(), propagate ret code of bdrv_create() and also the one of enable_write_target(). Signed-off-by: Fam Zheng <famz@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-04-22block: Remove filename parameter from .bdrv_file_open()Kevin Wolf
It is unused now in all block drivers. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-04-22vvfat: Use bdrv_open options instead of filenameKevin Wolf
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-22block: Add options QDict to bdrv_file_open() prototypesKevin Wolf
The new parameter is unused yet. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-15block: Add options QDict to bdrv_open() prototypeKevin Wolf
It doesn't do anything yet except storing the options QDict in the BlockDriverState. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-01-11Replace remaining gmtime, localtime by gmtime_r, localtime_rStefan Weil
This allows removing of MinGW specific code and improves reentrancy for POSIX hosts. [Removed unused ret variable in qemu_get_timedate() to fix warning: vl.c: In function ‘qemu_get_timedate’: vl.c:451:16: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] -- Stefan Hajnoczi] Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19migration: move include files to include/migration/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19block: move include files to include/block/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-08-15block: Convert close calls to qemu_closeCorey Bryant
This patch converts all block layer close calls, that correspond to qemu_open calls, to qemu_close. Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-08-15block: Convert open calls to qemu_openCorey Bryant
This patch converts all block layer open calls to qemu_open. Note that this adds the O_CLOEXEC flag to the changed open paths when the O_CLOEXEC macro is defined. Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17vvfat: Do not clobber the user's geometryMarkus Armbruster
vvfat creates a virtual VFAT filesystem with a certain logical geometry that depends on its options. It sets the "geometry hint" to this geometry. It is the only block driver to do this. The geometry hint is about about *physical* geometry, and used only by certain hard disk device models. vvfat's hint is normally invisible for device models, because bdrv_open() puts a raw format on top of vvfat's fat protocol. That raw format is where drive_init() puts the user's geometry (if any), and where the device model gets it from. Nobody complained, because the default physical geometry is the same as vvfat's logical geometry: opts LCHS def. PCHS 1024,16,63 same :32: 1024,16,63 same :16: 1024,16,63 same :12: 64,16,63 same Except when you specify :floppy: opts LCHS def. PCHS :floppy: 80, 2,36 5,16,63 :32:floppy: 80, 2,36 5,16,63 :16:floppy: 80, 2,36 5,16,63 :12:floppy: 80, 2,18 2,16,63 Silly thing to do for use with a hard disk. However, the "raw" format can be suppressed by adding an redundant-looking "format=vvfat" to "file=fat:FOO". Then, vvfat's hint clobbers the user's geometry, i.e. -drive options cyls, heads, secs get silently ignored. Don't do that. No change without format=vvfat. With it, the user's hard disk geometry (-drive options cyls, heads, secs) is now obeyed, and the default hard disk geometry with :floppy: now matches the one without format=vvfat. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-07-17vvfat: Fix partition tableMarkus Armbruster
Unless parameter ":floppy:" is given, vvfat creates a virtual image with DOS MBR defining a single partition which holds the FAT file system. The size of the virtual image depends on the width of the FAT: 32 MiB (CHS 64, 16, 63) for 12 bit FAT, 504 MiB (CHS 1024, 16, 63) for 16 and 32 bit FAT, leaving (64*16-1)*63 = 64449 and (1024*16-1)*64 = 1032129 sectors for the partition. However, it screws up the end of the partition in the MBR: FAT width param. start CHS end CHS start LBA size :32: 0,1,1 1023,14,63 63 1032065 :16: 0,1,1 1023,14,55 63 1032057 :12: 0,1,1 63,14,55 63 64377 The actual FAT file system nevertheless assumes the partition has 1032129 or 64449 sectors. Oops. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-05-30block: prevent snapshot mode $TMPDIR symlink attackJim Meyering
In snapshot mode, bdrv_open creates an empty temporary file without checking for mkstemp or close failure, and ignoring the possibility of a buffer overrun given a surprisingly long $TMPDIR. Change the get_tmp_filename function to return int (not void), so that it can inform its two callers of those failures. Also avoid the risk of buffer overrun and do not ignore mkstemp or close failure. Update both callers (in block.c and vvfat.c) to propagate temp-file-creation failure to their callers. get_tmp_filename creates and closes an empty file, while its callers later open that presumed-existing file with O_CREAT. The problem was that a malicious user could provoke mkstemp failure and race to create a symlink with the selected temporary file name, thus causing the qemu process (usually root owned) to open through the symlink, overwriting an attacker-chosen file. This addresses CVE-2012-2652. http://bugzilla.redhat.com/CVE-2012-2652 Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-05-10block: fix snapshot on QEDPaolo Bonzini
QED's opaque data includes a pointer back to the BlockDriverState. This breaks when bdrv_append shuffles data between bs_new and bs_top. To avoid this, add a "rebind" function that tells the driver about the new relationship between the BlockDriverState and its opaque. The patch also adds rebind to VVFAT for completeness, even though it is not used with live snapshots. Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-01-13vvfat: avoid leaking file descriptor in commit_one_file()Stefan Hajnoczi
Reported-by: Dr David Alan Gilbert <davidagilbert@uk.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-12-05vvfat: convert to .bdrv_co_is_allocated()Stefan Hajnoczi
It is trivial to switch from the synchronous .bdrv_is_allocated() interface to .bdrv_co_is_allocated() since vvfat_is_allocated() does not block. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-23vvfat: Add migration blockerKevin Wolf
vvfat caches more or less everything when in writable mode. For migration to work, it would have to be invalidated. Block migration for now when in writable mode (default is readonly). Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-11vvfat: Fix read-write modeKevin Wolf
vvfat used to directly call into the qcow2 block driver instead of using the block.c wrappers. With the coroutine conversion, this stopped working. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2011-11-04vvfat: reorganize computation of disk geometryPaolo Bonzini
First determine FAT12/16/32, then compute geometry from that for both FDD and HDD. For 1.44MB floppies, and 2.88MB floppies using FAT16, change to 1 sector/cluster. The default remains 2.88MB with FAT12 and 2 sectors/cluster. Both DOS and mkdosfs by default format a 2.88MB floppy as FAT12. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-04vvfat: do not hardcode sector counts in error messagePaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-04vvfat: unify and correct computation of sector countPaolo Bonzini
The sector count is stored in the partition and hence must not include the sectors before its start. At the same time, remove the useless special casing for 1.44 MB floppies. This fixes fsck on VVFAT hard disks, which otherwise tries to seek past the end of the disk. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-04vvfat: need to use first_sectors_number to distinguish fdd/hddPaolo Bonzini
This is consistent with what "real" floppies have, so file(1) now actually recognizes the VVFAT image as a 1.44 MB floppy. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-04vvfat: do not fail if the disk has spare sectorsPaolo Bonzini
If the number of "faked sectors" + the number of sectors that are part of a cluster does not sum up to the total number of sectors, qemu-img convert fails. Read these spare sectors as all zeros. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-11-04vvfat: fix out of bounds array_get usagePaolo Bonzini
When reading the address of the first free entry, you cannot use array_get without first marking all entries as occupied. This is visible if you change the sectors per cluster on a floppy from 2 to 1. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-21block: take lock around bdrv_write implementationsPaolo Bonzini
This does the first part of the conversion to coroutines, by wrapping bdrv_write implementations to take the mutex. Drivers that implement bdrv_write rather than bdrv_co_writev can then benefit from asynchronous operation (at least if the underlying protocol supports it, which is not the case for raw-win32), even though they still operate with a bounce buffer. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-21block: take lock around bdrv_read implementationsPaolo Bonzini
This does the first part of the conversion to coroutines, by wrapping bdrv_read implementations to take the mutex. Drivers that implement bdrv_read rather than bdrv_co_readv can then benefit from asynchronous operation (at least if the underlying protocol supports it, which is not the case for raw-win32), even though they still operate with a bounce buffer. raw-win32 does not need the lock, because it cannot yield. nbd also doesn't probably, but better be safe. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-21block: add a CoMutex to synchronous read driversPaolo Bonzini
The big conversion of bdrv_read/write to coroutines caused the two homonymous callbacks in BlockDriver to become reentrant. It goes like this: 1) bdrv_read is now called in a coroutine, and calls bdrv_read or bdrv_pread. 2) the nested bdrv_read goes through the fast path in bdrv_rw_co_entry; 3) in the common case when the protocol is file, bdrv_co_do_readv calls bdrv_co_readv_em (and from here goes to bdrv_co_io_em), which yields until the AIO operation is complete; 4) if bdrv_read had been called from a bottom half, the main loop is free to iterate again: a device model or another bottom half can then come and call bdrv_read again. This applies to all four of read/write/flush/discard. It would also apply to is_allocated, but it is not used from within coroutines: besides qemu-img.c and qemu-io.c, which operate synchronously, the only user is the monitor. Copy-on-read will introduce a use in the block layer, and will require converting it. The solution is "simply" to convert all drivers to coroutines! We just need to add a CoMutex that is taken around affected operations. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-11vvfat: Fix potential buffer overflowKevin Wolf
path2[PATH_MAX] can be used for the null termination, so make the array big enough to allow this. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-11block/vvfat: Remove unused codeStefan Weil
The unused code was detected using cppcheck. Cc: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-10-11block/vvfat: Fix potential memory leaks and other memory errorsStefan Weil
cppcheck reported memory leaks and mismatched g_malloc() with free() instead of g_free(). Fix these errors. Cc: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2011-09-16Remove blanks before \n in output stringsStefan Weil
Those blanks violate the coding conventions, see scripts/checkpatch.pl. Blanks missing after colons in the changed lines were added. This patch does not try to fix tabs, long lines and other problems in the changed lines, therefore checkpatch.pl reports many violations. Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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