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In mode_to_acl when converting a Unix mode to a Windows ACL
the subauth fields of the SID in the ACL were translated
incorrectly on bigendian architectures
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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fs/cifs/cifssmb.c:3917:13: warning: incorrect type in assignment (different base types)
fs/cifs/cifssmb.c:3917:13: expected bool [unsigned] [usertype] is_unicode
fs/cifs/cifssmb.c:3917:13: got restricted __le16
The comment explains why __force is used here.
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
fs/cifs/connect.c:458:16: warning: cast to restricted __be32
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Move the code that handles ATTR_SIZE changes to its own function. This
makes for a smaller function and reduces the level of indentation.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Put CIFS sockets in their own class to avoid some lockdep warnings. CIFS
sockets are not exposed to user-space, and so are not subject to the
same deadlock scenarios.
A similar change was made a couple of years ago for RPC sockets in commit
ed07536ed6731775219c1df7fa26a7588753e693.
This patch should prevent lockdep false-positives like this one:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.18-98.el5.jtltest.38.bz456320.1debug #1
-------------------------------------------------------
test5/2483 is trying to acquire lock:
(sk_lock-AF_INET){--..}, at: [<ffffffff800270d2>] tcp_sendmsg+0x1c/0xb2f
but task is already holding lock:
(&inode->i_alloc_sem){--..}, at: [<ffffffff8002e454>] notify_change+0xf5/0x2e0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&inode->i_alloc_sem){--..}:
[<ffffffff800a817c>] __lock_acquire+0x9a9/0xadf
[<ffffffff800a8a72>] lock_acquire+0x55/0x70
[<ffffffff8002e454>] notify_change+0xf5/0x2e0
[<ffffffff800a4e36>] down_write+0x3c/0x68
[<ffffffff8002e454>] notify_change+0xf5/0x2e0
[<ffffffff800e358d>] do_truncate+0x50/0x6b
[<ffffffff8005197c>] get_write_access+0x40/0x46
[<ffffffff80012cf1>] may_open+0x1d3/0x22e
[<ffffffff8001bc81>] open_namei+0x2c6/0x6dd
[<ffffffff800289c6>] do_filp_open+0x1c/0x38
[<ffffffff800683ef>] _spin_unlock+0x17/0x20
[<ffffffff800167a7>] get_unused_fd+0xf9/0x107
[<ffffffff8001a704>] do_sys_open+0x44/0xbe
[<ffffffff80060116>] system_call+0x7e/0x83
[<ffffffffffffffff>] 0xffffffffffffffff
-> #2 (&sysfs_inode_imutex_key){--..}:
[<ffffffff800a817c>] __lock_acquire+0x9a9/0xadf
[<ffffffff8010f6df>] create_dir+0x26/0x1d7
[<ffffffff800a8a72>] lock_acquire+0x55/0x70
[<ffffffff8010f6df>] create_dir+0x26/0x1d7
[<ffffffff800671c0>] mutex_lock_nested+0x104/0x29c
[<ffffffff800a819d>] __lock_acquire+0x9ca/0xadf
[<ffffffff8010f6df>] create_dir+0x26/0x1d7
[<ffffffff8010fc67>] sysfs_create_dir+0x58/0x76
[<ffffffff8015144c>] kobject_add+0xdb/0x198
[<ffffffff801be765>] class_device_add+0xb2/0x465
[<ffffffff8005a6ff>] kobject_get+0x12/0x17
[<ffffffff80225265>] register_netdevice+0x270/0x33e
[<ffffffff8022538c>] register_netdev+0x59/0x67
[<ffffffff80464d40>] net_olddevs_init+0xb/0xac
[<ffffffff80448a79>] init+0x1f9/0x2fc
[<ffffffff80068885>] _spin_unlock_irq+0x24/0x27
[<ffffffff80067f86>] trace_hardirqs_on_thunk+0x35/0x37
[<ffffffff80061079>] child_rip+0xa/0x11
[<ffffffff80068885>] _spin_unlock_irq+0x24/0x27
[<ffffffff800606a8>] restore_args+0x0/0x30
[<ffffffff80179a59>] acpi_ds_init_one_object+0x0/0x80
[<ffffffff80448880>] init+0x0/0x2fc
[<ffffffff8006106f>] child_rip+0x0/0x11
[<ffffffffffffffff>] 0xffffffffffffffff
-> #1 (rtnl_mutex){--..}:
[<ffffffff800a817c>] __lock_acquire+0x9a9/0xadf
[<ffffffff8025acf8>] ip_mc_leave_group+0x23/0xb7
[<ffffffff800a8a72>] lock_acquire+0x55/0x70
[<ffffffff8025acf8>] ip_mc_leave_group+0x23/0xb7
[<ffffffff800671c0>] mutex_lock_nested+0x104/0x29c
[<ffffffff8025acf8>] ip_mc_leave_group+0x23/0xb7
[<ffffffff802451b0>] do_ip_setsockopt+0x6d1/0x9bf
[<ffffffff800a575e>] lock_release_holdtime+0x27/0x48
[<ffffffff800a575e>] lock_release_holdtime+0x27/0x48
[<ffffffff8006a85e>] do_page_fault+0x503/0x835
[<ffffffff8012cbf6>] socket_has_perm+0x5b/0x68
[<ffffffff80245556>] ip_setsockopt+0x22/0x78
[<ffffffff8021c973>] sys_setsockopt+0x91/0xb7
[<ffffffff800602a6>] tracesys+0xd5/0xdf
[<ffffffffffffffff>] 0xffffffffffffffff
-> #0 (sk_lock-AF_INET){--..}:
[<ffffffff800a5037>] print_stack_trace+0x59/0x68
[<ffffffff800a8092>] __lock_acquire+0x8bf/0xadf
[<ffffffff800a8a72>] lock_acquire+0x55/0x70
[<ffffffff800270d2>] tcp_sendmsg+0x1c/0xb2f
[<ffffffff80035466>] lock_sock+0xd4/0xe4
[<ffffffff80096e91>] _local_bh_enable+0xcb/0xe0
[<ffffffff800606a8>] restore_args+0x0/0x30
[<ffffffff800270d2>] tcp_sendmsg+0x1c/0xb2f
[<ffffffff80057540>] sock_sendmsg+0xf3/0x110
[<ffffffff800a2bb6>] autoremove_wake_function+0x0/0x2e
[<ffffffff800a10e4>] kernel_text_address+0x1a/0x26
[<ffffffff8006f4e2>] dump_trace+0x211/0x23a
[<ffffffff800a6d3d>] find_usage_backwards+0x5f/0x88
[<ffffffff8840221a>] MD5Final+0xaf/0xc2 [cifs]
[<ffffffff884032ec>] cifs_calculate_signature+0x55/0x69 [cifs]
[<ffffffff8021d891>] kernel_sendmsg+0x35/0x47
[<ffffffff883ff38e>] smb_send+0xa3/0x151 [cifs]
[<ffffffff883ff5de>] SendReceive+0x1a2/0x448 [cifs]
[<ffffffff800a812f>] __lock_acquire+0x95c/0xadf
[<ffffffff883e758a>] CIFSSMBSetEOF+0x20d/0x25b [cifs]
[<ffffffff883fa430>] cifs_set_file_size+0x110/0x3b7 [cifs]
[<ffffffff883faa89>] cifs_setattr+0x3b2/0x6f6 [cifs]
[<ffffffff8002e454>] notify_change+0xf5/0x2e0
[<ffffffff8002e4a4>] notify_change+0x145/0x2e0
[<ffffffff800e358d>] do_truncate+0x50/0x6b
[<ffffffff8005197c>] get_write_access+0x40/0x46
[<ffffffff80012cf1>] may_open+0x1d3/0x22e
[<ffffffff8001bc81>] open_namei+0x2c6/0x6dd
[<ffffffff800289c6>] do_filp_open+0x1c/0x38
[<ffffffff800683ef>] _spin_unlock+0x17/0x20
[<ffffffff800167a7>] get_unused_fd+0xf9/0x107
[<ffffffff8001a704>] do_sys_open+0x44/0xbe
[<ffffffff800602a6>] tracesys+0xd5/0xdf
[<ffffffffffffffff>] 0xffffffffffffffff
other info that might help us debug this:
2 locks held by test5/2483:
#0: (&inode->i_mutex){--..}, at: [<ffffffff800e3582>] do_truncate+0x45/0x6b
#1: (&inode->i_alloc_sem){--..}, at: [<ffffffff8002e454>] notify_change+0xf5/0x2e0
stack backtrace:
Call Trace:
[<ffffffff800a6a7b>] print_circular_bug_tail+0x65/0x6e
[<ffffffff800a5037>] print_stack_trace+0x59/0x68
[<ffffffff800a8092>] __lock_acquire+0x8bf/0xadf
[<ffffffff800a8a72>] lock_acquire+0x55/0x70
[<ffffffff800270d2>] tcp_sendmsg+0x1c/0xb2f
[<ffffffff80035466>] lock_sock+0xd4/0xe4
[<ffffffff80096e91>] _local_bh_enable+0xcb/0xe0
[<ffffffff800606a8>] restore_args+0x0/0x30
[<ffffffff800270d2>] tcp_sendmsg+0x1c/0xb2f
[<ffffffff80057540>] sock_sendmsg+0xf3/0x110
[<ffffffff800a2bb6>] autoremove_wake_function+0x0/0x2e
[<ffffffff800a10e4>] kernel_text_address+0x1a/0x26
[<ffffffff8006f4e2>] dump_trace+0x211/0x23a
[<ffffffff800a6d3d>] find_usage_backwards+0x5f/0x88
[<ffffffff8840221a>] :cifs:MD5Final+0xaf/0xc2
[<ffffffff884032ec>] :cifs:cifs_calculate_signature+0x55/0x69
[<ffffffff8021d891>] kernel_sendmsg+0x35/0x47
[<ffffffff883ff38e>] :cifs:smb_send+0xa3/0x151
[<ffffffff883ff5de>] :cifs:SendReceive+0x1a2/0x448
[<ffffffff800a812f>] __lock_acquire+0x95c/0xadf
[<ffffffff883e758a>] :cifs:CIFSSMBSetEOF+0x20d/0x25b
[<ffffffff883fa430>] :cifs:cifs_set_file_size+0x110/0x3b7
[<ffffffff883faa89>] :cifs:cifs_setattr+0x3b2/0x6f6
[<ffffffff8002e454>] notify_change+0xf5/0x2e0
[<ffffffff8002e4a4>] notify_change+0x145/0x2e0
[<ffffffff800e358d>] do_truncate+0x50/0x6b
[<ffffffff8005197c>] get_write_access+0x40/0x46
[<ffffffff80012cf1>] may_open+0x1d3/0x22e
[<ffffffff8001bc81>] open_namei+0x2c6/0x6dd
[<ffffffff800289c6>] do_filp_open+0x1c/0x38
[<ffffffff800683ef>] _spin_unlock+0x17/0x20
[<ffffffff800167a7>] get_unused_fd+0xf9/0x107
[<ffffffff8001a704>] do_sys_open+0x44/0xbe
[<ffffffff800602a6>] tracesys+0xd5/0xdf
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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The current definition of wksidarr works fine on little endian arches
(since cpu_to_le32 is a no-op there), but on big-endian arches, it fails
to compile with this error:
error: braced-group within expression allowed only inside a function
The problem is that this static declaration has cpu_to_le32 embedded
within it, and that expands into a function macro. We need to use
__constant_cpu_to_le32() instead.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Cc: Steven French <sfrench@us.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Try this:
mount a share with unix extensions
create a file on it
umount the share
You'll get the following message in the ring buffer:
VFS: Busy inodes after unmount of cifs. Self-destruct in 5 seconds. Have a
nice day...
...the problem is that cifs_get_inode_info_unix is creating and hashing
a new inode even when it's going to return error anyway. The first
lookup when creating a file returns an error so we end up leaking this
inode before we do the actual create. This appears to be a regression
caused by commit 0e4bbde94fdc33f5b3d793166b21bf768ca3e098.
The following patch seems to fix it for me, and fixes a minor
formatting nit as well.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- Replace remote_llseek with generic_file_llseek_unlocked (to force compilation
failures in all users)
- Change all users to either use generic_file_llseek_unlocked directly or
take the BKL around. I changed the file systems who don't use the BKL
for anything (CIFS, GFS) to call it directly. NCPFS and SMBFS and NFS
take the BKL, but explicitely in their own source now.
I moved them all over in a single patch to avoid unbisectable sections.
Open problem: 32bit kernels can corrupt fpos because its modification
is not atomic, but they can do that anyways because there's other paths who
modify it without BKL.
Do we need a special lock for the pos/f_version = 0 checks?
Trond says the NFS BKL is likely not needed, but keep it for now
until his full audit.
v2: Use generic_file_llseek_unlocked instead of remote_llseek_unlocked
and factor duplicated code (suggested by hch)
Cc: Trond.Myklebust@netapp.com
Cc: swhiteho@redhat.com
Cc: sfrench@samba.org
Cc: vandrove@vc.cvut.cz
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
[CIFS] cifs: fix oops on mount when CONFIG_CIFS_DFS_UPCALL is enabled
[CIFS] Fix hang in mount when negprot causes server to kill tcp session
disable most mode changes on non-unix/non-cifsacl mounts
[CIFS] Correct incorrect obscure open flag
[CIFS] warn if both dynperm and cifsacl mount options specified
silently ignore ownership changes unless unix extensions are enabled or we're faking uid changes
[CIFS] remove trailing whitespace
when creating new inodes, use file_mode/dir_mode exclusively on mount without unix extensions
on non-posix shares, clear write bits in mode when ATTR_READONLY is set
[CIFS] remove unused variables
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simple "mount -t cifs //xxx /mnt" oopsed on strlen of options
http://kerneloops.org/guilty.php?guilty=cifs_get_sb&version=2.6.25-release&start=16711 \
68&end=1703935&class=oops
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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- Don't trust a length which is greater than the working buffer.
An invalid length could cause overflow when calculating buffer size
for decoding oid.
- An oid length of zero is invalid and allows for an off-by-one error when
decoding oid because the first subid actually encodes first 2 subids.
- A primitive encoding may not have an indefinite length.
Thanks to Wei Wang from McAfee for report.
Cc: Steven French <sfrench@us.ibm.com>
Cc: stable@kernel.org
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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__le16 fields used as host-endian.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Steve French <smfrench@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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CIFS currently allows you to change the mode of an inode on a share that
doesn't have unix extensions enabled, and isn't using cifsacl. The inode
in this case *only* has its mode changed in memory on the client. This
is problematic since it can change any time the inode is purged from the
cache.
This patch makes cifs_setattr silently ignore most mode changes when
unix extensions and cifsacl support are not enabled, and when the share
is not mounted with the "dynperm" option. The exceptions are:
When a mode change would remove all write access to an inode we turn on
the ATTR_READONLY bit on the server and remove all write bits from the
inode's mode in memory.
When a mode change would add a write bit to an inode that previously had
them all turned off, it turns off the ATTR_READONLY bit on the server,
and resets the mode back to what it would normally be (generally, the
file_mode or dir_mode of the share).
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Also add defines for pipe subcommand codes
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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we're faking uid changes
CIFS currently allows you to change the ownership of a file, but unless
unix extensions are enabled this change is not passed off to the server.
Have CIFS silently ignore ownership changes that can't be persistently
stored on the server unless the "setuids" option is explicitly
specified.
We could return an error here (-EOPNOTSUPP or something), but this is
how most disk-based windows filesystems on behave on Linux (e.g. VFAT,
NTFS, etc). With cifsacl support and proper Windows to Unix idmapping
support, we may be able to do this more properly in the future.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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without unix extensions
When CIFS creates a new inode on a mount without unix extensions, it
temporarily assigns the mode that was passed to it in the create/mkdir
call. Eventually, when the inode is revalidated, it changes to have the
file_mode or dir_mode for the mount. This is confusing to users who
expect that the mode shouldn't change this way. It's also problematic
since only the mode is treated this way, not the uid or gid. Suppose you
have a CIFS mount that's mounted with:
uid=0,gid=0,file_mode=0666,dir_mode=0777
...if an unprivileged user comes along and does this on the mount:
mkdir -m 0700 foo
touch foo/bar
...there is a period of time where the touch will fail, since the dir
will initially be owned by root and have mode 0700. If the user waits
long enough, then "foo" will be revalidated and will get the correct
dir_mode permissions.
This patch changes cifs_mkdir and cifs_create to not overwrite the
mode found by the initial cifs_get_inode_info call after the inode is
created on the server. Legacy behavior can be reenabled with the
new "dynperm" mount option.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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When mounting a share with posix extensions disabled,
cifs_get_inode_info turns off all the write bits in the mode for regular
files if ATTR_READONLY is set. Directories and other inode types,
however, can also have ATTR_READONLY set, but the mode gives no
indication of this.
This patch makes this apply to other inode types besides regular files.
It also cleans up how modes are set in cifs_get_inode_info for both the
"normal" and "dynperm" cases.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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CC: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Noticed by Coverity checker.
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Final piece for handling DFS in query_path_info, constructing a
fake inode for the junction directory which the submount will cover.
This handles the non-Unix (Windows etc.) code path.
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Final piece for handling DFS in unix_query_path_info, constructing a
fake inode for the junction directory which the submount will cover.
Acked-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Also Kari Hurtta noticed a missing check in the same function which is now fixed.
CC: Kari Hurtta <hurtta+gmane@siilo.fmi.fi>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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adds various options to cifs_show_options
(displayed when you cat /proc/mounts with a cifs mount). I limited
the new ones to values that are associated with the mount with the
exception of "seal" (which is a per tree connection property, but I
thought was important enough to show through).
Eventually cifs's parse_mount_options also needs to
be rewritten to use the match_token API but that would be a big enough
change that I would prefer that changing parse_mount_options wait
until next release.
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Also has minor cleanup of previous patch
CC: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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the MS-DFSC spec.
Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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path if share in the dfs, now.
Signed-off-by: Igor Mammedov <niallain@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Samba now supports transport encryption on particular exports
(mounted tree ids can be encrypted for servers which support the
unix extensions). This adds parsing support to cifs mount
option parsing for this.
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Fixup GetDFSRefer to prepare for cleanup of SMB response processing
Fix build warning in link.c
Signed-off-by: Steve French <sfrench@us.ibm.com>
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cifs_ioctl doesn't seem to need the BKL for anything, so convert it over
to use unlocked_ioctl.
Signed-off-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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fs/cifs/dir.c: In function 'cifs_ci_compare':
fs/cifs/dir.c:582: warning: passing argument 1 of 'memcpy' discards
qualifiers from pointer target type
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Some versions of Samba (3.2-pre e.g.) are stricter about checking to make sure that
paths in DFS name spaces are sent in the form \\server\share\dir\subdir ...
instead of \dir\subdir
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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SMBLegacyOpen always opens a file as r/w. This could be problematic
for files with ATTR_READONLY set. Have it interpret the access_mode
into a sane open mode.
Signed-off-by: Steve French <sfrench@us.ibm.com>
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cifs_convert_flags returns 0x20197 in the default case. It's not
immediately evident where that number comes from, so change it
to be an or'ed set of flags. The compiler will boil it down anyway.
(Thanks to Guenter Kukkukk for clarifying the flags).
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Do the following series of operations on a CIFS share:
opendir(dir)
readdir(dir)
unlink(file in dir)
rewinddir(dir)
readdir(dir)
If the readdir read all entries in the directory this will make CIFS throw an error like this:
CIFS VFS: Send error in FindClose = -9
CIFS requests "Close at end of search" of the server by setting this bit when issuing FindFirst or FindNext. Therefore when all search entries are returned, the server may return "end of search" and close the search implicitly when this bit is set by the client on the request. We check for this when a readdir is explicitly closed - but when the client notices that a directory has changed after the last operation, we attempt to close the directory before reopening by reissuing a second FindFirst. But, the directory may already been implicitly closed (due to end of search) because the first readdir finished. So we only want to issue a FindClose call in this case when we don't expect it to already be closed.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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Signed-off-by: Steve French <sfrench@us.ibm.com>
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all other codepaths in this function return negative values on errors
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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When CIFSFindNext gets back an -EBADF from a call, it sets the return
code of the function to 0 and eventually exits. Doing this makes the
cleanup at the end of the function skip freeing the SMB buffer, so
we need to make sure we free the buffer explicitly when doing this.
If we don't you end up with errors like this when unplugging the cifs
kernel module:
slab error in kmem_cache_destroy(): cache `cifs_request': Can't free all objects
[<c046bdbf>] kmem_cache_destroy+0x61/0xf3
[<e0f03045>] cifs_destroy_request_bufs+0x14/0x28 [cifs]
[<e0f2016e>] exit_cifs+0x1e/0x80 [cifs]
[<c043aeae>] sys_delete_module+0x192/0x1b8
[<c04451fd>] audit_syscall_entry+0x14b/0x17d
[<c0405413>] syscall_call+0x7/0xb
=======================
Signed-off-by: Jeff Layton <jlayton@redhat.com>
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when unix extensions and cifsacl support are disabled. These
permissions changes are "ephemeral" however. They are lost whenever
a share is mounted and unmounted, or when memory pressure forces
the inode out of the cache.
Because of this, we'd like to introduce a behavior change to make
CIFS behave more like local DOS/Windows filesystems. When unix
extensions and cifsacl support aren't enabled, then don't silently
ignore changes to permission bits that can't be reflected on the
server.
Still, there may be people relying on the current behavior for
certain applications. This patch adds a new "dynperm" (and a
corresponding "nodynperm") mount option that will be intended
to make the client fall back to legacy behavior when setting
these modes.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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cifs_demultiplex_thread can exit under several conditions:
1) if it's signaled
2) if there's a problem with session setup
3) if kthread_stop is called on it
The first two are problems. If kthread_stop is called on the thread,
there is no guarantee that it will still be up. We need to have the
thread stay up until kthread_stop is called on it.
One option would be to not even try to tear things down until after
kthread_stop is called. However, in the case where there is a problem
setting up the session, there's no real reason to try continuing the
loop.
This patch allows the thread to clean up and prepare for exit under all
three conditions, but it has the thread go to sleep until kthread_stop
is called. This allows us to simplify the shutdown code somewhat since
we can be reasonably sure that the thread won't exit after being
signaled but before kthread_stop is called.
It also removes the places where the thread itself set the tsk variable
since it appeared that it could have a potential race where the thread
might never be shut down.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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