When path is truncated by PATH_MAX limitation, it causes QEMU to access
incorrect file. So use original full path instead of PATH_MAX within
9pfs (need check/process ENOMEM for related memory allocation).
The related test:
- Environments (for qemu-devel):
- Host is under fedora17 desktop with ext4fs:
qemu-system-x86_64 -hda test.img -m 1024 \
-net nic,vlan=4,model=virtio,macaddr=00:16:35:AF:94:04 \
-net tap,vlan=4,ifname=tap4,script=no,downscript=no \
-device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare \
-fsdev local,security_model=passthrough,id=fsdev0,\
path=/upstream/vm/data/share/1234567890abcdefghijklmnopqrstuvwxyz\
ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890acdefghijklmnopqrstuvwxyz\
ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890/111111111111111111111111111\
1111111111111111111111111111111111111111111111111111222222222222\
2222222222222222222222222222222222222222222222222222222222222222\
2222222222222222222222222222222222233333333333333333333333333333\
3333333333333333333333333333333333
- Guest is ubuntu12 server with 9pfs.
mount -t 9p -o trans=virtio,version=9p2000.L hostshare /share
- Limitations:
full path limitation is PATH_MAX (4096B include nul) under Linux.
file/dir node name maximized length is 256 (include nul) under ext4.
- Special test:
Under host, modify the file: "/upstream/vm/data/share/1234567890abcdefg\
hijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890acdefghijklmno\
pqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890/111111111111111111111\
111111111111111111111111111111111111111111111111111111111122222222222\
222222222222222222222222222222222222222222222222222222222222222222222\
222222222222222222222222222222233333333333333333333333333333333333333\
3333333333333333333333333/4444444444444444444444444444444444444444444\
444444444444444444444444444444444444444444444444444444444444444444444\
444444444444444444444444444444444444444444444444444444444444444444444\
444444444444444444444444444444444444444/55555555555555555555555555555\
555555555555555555555555555555555555555555555555555555555555555555555\
555555555555555555555555555555555555555555555555555555555555555555555\
555555555555555555555555555555555555555555555555555555555555555555555\
55555555/666666666666666666666666666666666666666666666666666666666666\
666666666666666666666666666666666666666666666666666666666666666666666\
666666666666666666666666666666666666666666666666666666666666666666666\
666666666666666666666/77777777777777777777777777777777777777777777777\
777777777777777777777777777777777777777777777777777777777777777777777\
777777777777777777777777777777777777777777777777777777777777777777777\
77777777777777777777777777777777777777777777777777777777777/888888888\
888888888888888888888888888888888888888888888888888888888888888888888\
888888888888888888888888888888888888888888888888888888888888888888888\
888888888888888888888888888888888888888888888888888888888888888888888\
888888888/99999999999999999999999999999999999999999999999999999999999\
999999999999999999999999999999999999999999999999999999999999999999999\
999999999999999999999999999999999999999999999999999999999999999999999\
99999999999999999999999999999999999999999/000000000000000000000000000\
000000000000000000000000000000000000000000000000000000000000000000000\
000000000000000000000000000000000000000000000000000000000000000000000\
000000000000000000000000000000000000000000000000/aaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbb\
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/ccccccccc\
ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc\
ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc\
ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc\
cccccccccc/dddddddddddddddddddddddddddddddddddddddddddddddddddddddddd\
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd\
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd\
dddddddddddddddddddddd/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee\
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee\
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee\
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee/fffffffffffffff\
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\
fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff/gggggggggg\
ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg\
ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg\
ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg\
ggggggggggggggggggggggg/iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii\
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii\
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii\
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii/jjjjjjjjjjjjj\
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj\
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj/ppppppppppppppppppppp\
ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp\
ppppppppppppppppppppppppppppppppppppppp/test1234567890file.log"
(need enter dir firstly, then modify file, or can not open it).
Under guest, still allow modify "test1234567890file.log" (will generate
"test123456" file with contents).
After apply this patch, can not open "test1234567890file.log" under guest
(permission denied).
- Common test:
All are still OK after apply this path.
"mkdir -p", "create/open file/dir", "modify file/dir", "rm file/dir".
change various mount point paths under host and/or guest.
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
As the virtio-9p-pci is switched to the new API, we can use QOM casts.
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1366708123-19626-5-git-send-email-fred.konrad@greensocs.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Here the virtio-9p-pci is modified for the new API. The device
virtio-9p-pci extends virtio-pci. It creates and connects a
virtio-9p-device during the init. The properties are not changed.
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1366708123-19626-3-git-send-email-fred.konrad@greensocs.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Create virtio-9p-device which extends virtio-device, so it can be connected on
virtio-bus.
Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
Message-id: 1366708123-19626-2-git-send-email-fred.konrad@greensocs.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Many of these should be cleaned up with proper qdev-/QOM-ification.
Right now there are many catch-all headers in include/hw/ARCH depending
on cpu.h, and this makes it necessary to compile these files per-target.
However, fixing this does not belong in these patches.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Move p9 marshaling/unmarshaling code to a separate file so that
proxy filesytem driver can use these calls. Also made marshaling
code generic to accept "struct iovec" instead of V9fsPDU.
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Now when you try to migrate with VirtFS export path mounted, you get a proper QMP error:
(qemu) migrate tcp:localhost:4444
Migration is disabled when VirtFS export path '/tmp/' is mounted in the guest using mount_tag 'v_tmp'
(qemu)
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This patch create a synthetic file system with mount tag
v_synth when -virtfs_synth command line option is specified
in qemu. The synthetic file system can be mounted in guest
using 9p using the below command line
mount -t 9p -oversion=9p2000.L,trans=virtio v_synth <mountpint>
Synthetic file system enabled different qemu subsystem to register
callbacks for read and write events from guest. The subsystem
can create directories and files in the synthetic file system as show
in ex below
qemu_v9fs_synth_mkdir(NULL, 0777, "test2", &node);
qemu_v9fs_synth_add_file(node, 0777, "testfile",
my_test_read, NULL, NULL);
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
To implement synthetic file system in Qemu we may not really
require file descriptor and Dir *. Make generic code use
V9fsFidOpenState instead.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Some of the flags are OS/arch dependent we need to use
9P defined value on wire,
Based on the original patch from Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Use 9P specific lock constants instead of arch specific lock constants.
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Add a new context flag PATHNAME_FSCONTEXT and indicate whether
the fs driver track fid using path names. Also add a private
pointer that help us to track fs driver specific values in there
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This enables us to add handles to track fids later. The
V9fsPath added is similar to V9fsString except that the
size include the NULL byte also.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
On rename we take the write lock and this ensure path
doesn't change as we operate on them.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
unlinkat - Remove a directory entry
size[4] Tunlinkat tag[2] dirfid[4] name[s] flag[4]
size[4] Runlinkat tag[2]
older Tremove have the below request format
size[4] Tremove tag[2] fid[4]
The remove message is used to remove a directory entry either file or directory
The remove opreation is actually a directory opertation and should ideally have
dirfid, if not we cannot represent the fid on server with anything other than
name. We will have to derive the directory name from fid in the Tremove request.
NOTE: The operation doesn't clunk the unlink fid.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
rename - change name of file or directory
size[4] Trenameat tag[2] olddirfid[4] oldname[s] newdirfid[4] newname[s]
size[4] Rrenameat tag[2]
older Trename have the below request format
size[4] Trename tag[2] fid[4] newdirfid[4] name[s]
The rename message is used to change the name of a file, possibly moving it
to a new directory. The rename opreation is actually a directory opertation
and should ideally have olddirfid, if not we cannot represent the fid on server
with anything other than name. We will have to derive the old directory name
from fid in the Trename request.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Most changes were made using these commands:
git grep -la '__attribute__((packed))'|xargs perl -pi -e 's/__attribute__\(\(packed\)\)/QEMU_PACKED/'
git grep -la '__attribute__ ((packed))'|xargs perl -pi -e 's/__attribute__ \(\(packed\)\)/QEMU_PACKED/'
git grep -la '__attribute__((__packed__))'|xargs perl -pi -e 's/__attribute__\(\(__packed__\)\)/QEMU_PACKED/'
git grep -la '__attribute__ ((__packed__))'|xargs perl -pi -e 's/__attribute__ \(\(__packed__\)\)/QEMU_PACKED/'
git grep -la '__attribute((packed))'|xargs perl -pi -e 's/__attribute\(\(packed\)\)/QEMU_PACKED/'
Whitespace in linux-user/syscall_defs.h was fixed manually
to avoid warnings from scripts/checkpatch.pl.
Manual changes were also applied to hw/pc.c.
I did not fix indentation with tabs in block/vvfat.c.
The patch will show 4 errors with scripts/checkpatch.pl.
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
I guess TRENAME 9p operation needs an update. The 9p op should
more similar renameat. Otherwise anything other than path cannot track
the fid.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This patch changes the top level handlers to coroutines and sets the base.
It will be followed up with series of patches to convert all filesystem
calls to threaded coroutines pushing all blocking clals in VirtFS out
of vcpu threads.
Signed-off-by: Venkateswararao Jujjuri "<jvrao@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Current rpath inline function is heavily used in all system calls.
This function has a static buffer making it a non-thread safe function.
This patch introduces new thread-safe routine and makes use of it.
Signed-off-by: Venkateswararao Jujjuri "<jvrao@linux.vnet.ibm.com>
The nwnames field in TWALK message is assumed to be >=0 and <= MAXWELEM
which is defined as macro P9_MAXWELEM (16) in virtio-9p.h as per 9p2000
RFC. Appropriate changes are required in V9fsWalkState and v9fs_walk.
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Now that we start adding more files related to 9pfs
it make sense to move them to a separate directory
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
