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path: root/fs/cifs/file.c
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2011-05-27[CIFS] Rename three structures to avoid camel caseSteve French
secMode to sec_mode and cifsTconInfo to cifs_tcon and cifsSesInfo to cifs_ses Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-27CIFS: Add rwpidforward mount optionPavel Shilovsky
Add rwpidforward mount option that switches on a mode when we forward pid of a process who opened a file to any read and write operation. This can prevent applications like WINE from failing on read or write operation on a previously locked file region from the same netfd from another process if we use mandatory brlock style. It is actual for WINE because during a run of WINE program two processes work on the same netfd - share the same file struct between several VFS fds: 1) WINE-server does open and lock; 2) WINE-application does read and write. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-26CIFS: Use pid saved from cifsFileInfo in writepages and set_file_sizePavel Shilovsky
We need it to make them work with mandatory locking style because we can fail in a situation like when kernel need to flush dirty pages and there is a lock held by a process who opened file. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-25cifs: convert cifs_writepages to use async writesJeff Layton
Have cifs_writepages issue asynchronous writes instead of waiting on each write call to complete before issuing another. This also allows us to return more quickly from writepages. It can just send out all of the I/Os and not wait around for the replies. In the WB_SYNC_ALL case, if the write completes with a retryable error, then the completion workqueue job will resend the write. This also changes the page locking semantics a little bit. Instead of holding the page lock until the response is received, release it after doing the send. This will reduce contention for the page lock and should prevent processes that have the file mmap'ed from being blocked unnecessarily. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-and-Tested-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-19CIFS: Simplify invalidate part (try #5)Pavel Shilovsky
Simplify many places when we call cifs_revalidate/invalidate to make it do what it exactly needs. Reviewed-by: Jeff Layton <jlayton@samba.org> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-19CIFS: directio read/write cleanupsPavel Shilovsky
Recently introduced strictcache mode brought a new code that can be efficiently used by directio part. That's let us add vectored operations and break unnecessary cifs_user_read and cifs_user_write. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-05-19CIFS: Add launder_page operation (try #3)Pavel Shilovsky
Add this let us drop filemap_write_and_wait from cifs_invalidate_mapping and simplify the code to properly process invalidate logic. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-04-12cifs: don't allow mmap'ed pages to be dirtied while under writeback (try #3)Jeff Layton
This is more or less the same patch as before, but with some merge conflicts fixed up. If a process has a dirty page mapped into its page tables, then it has the ability to change it while the client is trying to write the data out to the server. If that happens after the signature has been calculated then that signature will then be wrong, and the server will likely reset the TCP connection. This patch adds a page_mkwrite handler for CIFS that simply takes the page lock. Because the page lock is held over the life of writepage and writepages, this prevents the page from becoming writeable until the write call has completed. With this, we can also remove the "sign_zero_copy" module option and always inline the pages when writing. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-04-12cifs: replace /proc/fs/cifs/Experimental with a module parmJeff Layton
This flag currently only affects whether we allow "zero-copy" writes with signing enabled. Typically we map pages in the pagecache directly into the write request. If signing is enabled however and the contents of the page change after the signature is calculated but before the write is sent then the signature will be wrong. Servers typically respond to this by closing down the socket. Still, this can provide a performance benefit so the "Experimental" flag was overloaded to allow this. That's really not a good place for this option however since it's not clear what that flag does. Move that flag instead to a new module parameter that better describes its purpose. That's also better since it can be set at module insertion time by configuring modprobe.d. Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-04-12cifs: check for private_data before trying to put itJeff Layton
cifs_close doesn't check that the filp->private_data is non-NULL before trying to put it. That can cause an oops in certain error conditions that can occur on open or lookup before the private_data is set. Reported-by: Ben Greear <greearb@candelatech.com> CC: Stable <stable@kernel.org> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-03-10block: remove per-queue pluggingJens Axboe
Code has been converted over to the new explicit on-stack plugging, and delay users have been converted to use the new API for that. So lets kill off the old plugging along with aops->sync_page(). Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2011-02-04CIFS: Fix variable types in cifs_iovec_read/write (try #2)Pavel Shilovsky
Variable 'i' should be unsigned long as it's used in circle with num_pages, and bytes_read/total_written should be ssize_t according to return value. Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-31cifs: clean up some compiler warningsJeff Layton
New compiler warnings that I noticed when building a patchset based on recent Fedora kernel: fs/cifs/cifssmb.c: In function 'CIFSSMBSetFileSize': fs/cifs/cifssmb.c:4813:8: warning: variable 'data_offset' set but not used [-Wunused-but-set-variable] fs/cifs/file.c: In function 'cifs_open': fs/cifs/file.c:349:24: warning: variable 'pCifsInode' set but not used [-Wunused-but-set-variable] fs/cifs/file.c: In function 'cifs_partialpagewrite': fs/cifs/file.c:1149:23: warning: variable 'cifs_sb' set but not used [-Wunused-but-set-variable] fs/cifs/file.c: In function 'cifs_iovec_write': fs/cifs/file.c:1740:9: warning: passing argument 6 of 'CIFSSMBWrite2' from incompatible pointer type [enabled by default] fs/cifs/cifsproto.h:337:12: note: expected 'unsigned int *' but argument is of type 'size_t *' fs/cifs/readdir.c: In function 'cifs_readdir': fs/cifs/readdir.c:767:23: warning: variable 'cifs_sb' set but not used [-Wunused-but-set-variable] fs/cifs/cifs_dfs_ref.c: In function 'cifs_dfs_d_automount': fs/cifs/cifs_dfs_ref.c:342:2: warning: 'rc' may be used uninitialized in this function [-Wuninitialized] fs/cifs/cifs_dfs_ref.c:278:6: note: 'rc' was declared here Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-25CIFS: Implement cifs_strict_writev (try #4)Pavel Shilovsky
If we don't have Exclusive oplock we write a data to the server. Also set invalidate_mapping flag on the inode if we wrote something to the server. Add cifs_iovec_write to let the client write iovec buffers through CIFSSMBWrite2. Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20CIFS: Implement cifs_strict_readv (try #4)Pavel Shilovsky
Read from the cache if we have at least Level II oplock - otherwise read from the server. Add cifs_user_readv to let the client read into iovec buffers. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20CIFS: Implement cifs_file_strict_mmap (try #2)Pavel Shilovsky
Invalidate inode mapping if we don't have at least Level II oplock. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20CIFS: Implement cifs_strict_fsyncPavel Shilovsky
Invalidate inode mapping if we don't have at least Level II oplock in cifs_strict_fsync. Also remove filemap_write_and_wait call from cifs_fsync because it is previously called from vfs_fsync_range. Add file operations' structures for strict cache mode. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20CIFS: Make cifsFileInfo_put work with strict cache modePavel Shilovsky
On strict cache mode when we close the last file handle of the inode we should set invalid_mapping flag on this inode to prevent data coherency problem when we open it again but it has been modified on the server. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-20cifs: remove code for setting timeouts on requestsJeff Layton
Since we don't time out individual requests anymore, remove the code that we used to use for setting timeouts on different requests. Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-19cifs: don't fail writepages on -EAGAIN errorsJeff Layton
If CIFSSMBWrite2 returns -EAGAIN, then the error should be considered temporary. CIFS should retry the write instead of setting an error on the mapping and returning. For WB_SYNC_ALL, just retry the write immediately. In the WB_SYNC_NONE case, call redirty_page_for_writeback on all of the pages that didn't get written out and then move on. Also, fix up the handling of a short write with a successful return code. MS-CIFS says that 0 bytes_written means ENOSPC or EFBIG. It doesn't mention what a short, but non-zero write means, so for now treat it as we would an -EAGAIN return. Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-19CIFS: Fix oplock break handling (try #2)Pavel Shilovsky
When we get oplock break notification we should set the appropriate value of OplockLevel field in oplock break acknowledge according to the oplock level held by the client in this time. As we only can have level II oplock or no oplock in the case of oplock break, we should be aware only about clientCanCacheRead field in cifsInodeInfo structure. Also fix bug connected with wrong interpretation of OplockLevel field during oplock break notification processing. Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-09cifs: switch cifs_open and cifs_create to use CIFSSMBUnixSetFileInfoJeff Layton
We call CIFSSMBUnixSetPathInfo in these functions, but we have a filehandle since an open was just done. Switch these functions to use CIFSSMBUnixSetFileInfo instead. In practice, these codepaths are only used if posix opens are broken. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-06CIFS: Simplify cifs_open codePavel Shilovsky
Make the code more general for use in posix and non-posix open. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-01-06CIFS: Simplify non-posix open stuff (try #2)Pavel Shilovsky
Delete cifs_open_inode_helper and move non-posix open related things to cifs_nt_open function. Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-12-06cifs: fix use of CONFIG_CIFS_ACLJeff Layton
Some of the code under CONFIG_CIFS_ACL is dependent upon code under CONFIG_CIFS_EXPERIMENTAL, but the Kconfig options don't reflect that dependency. Move more of the ACL code out from under CONFIG_CIFS_EXPERIMENTAL and under CONFIG_CIFS_ACL. Also move find_readable_file out from other any sort of Kconfig option and make it a function normally compiled in. Reported-and-Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-10cifs: fix potential use-after-free in cifs_oplock_break_putJeff Layton
cfile may very well be freed after the cifsFileInfo_put. Make sure we have a valid pointer to the superblock for cifs_sb_deactive. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-05cifs: make cifs_set_oplock_level() take a cifsInodeInfo pointerPavel Shilovsky
All the callers already have a pointer to struct cifsInodeInfo. Use it. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-04cifs: dereferencing first then checkingJeff Layton
This patch is based on Dan's original patch. His original description is below: Smatch complained about a couple checking for NULL after dereferencing bugs. I'm not super familiar with the code so I did the conservative thing and move the dereferences after the checks. The dereferences in cifs_lock() and cifs_fsync() were added in ba00ba64cf0 "cifs: make various routines use the cifsFileInfo->tcon pointer". The dereference in find_writable_file() was added in 6508d904e6f "cifs: have find_readable/writable_file filter by fsuid". The comments there say it's possible to trigger the NULL dereference under stress. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-02[CIFS] Cleanup unused variable build warningSteve French
Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-02CIFS: Add cifs_set_oplock_levelPavel Shilovsky
Simplify many places when we need to set oplock level on an inode. Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-11-02FS: cifs, remove unneeded NULL testsJiri Slaby
Stanse found that pSMBFile in cifs_ioctl and file->f_path.dentry in cifs_user_write are dereferenced prior their test to NULL. The alternative is not to dereference them before the tests. The patch is to point out the problem, you have to decide. While at it we cache the inode in cifs_user_write to a local variable and use all over the function. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Steve French <sfrench@samba.org> Cc: linux-cifs@vger.kernel.org Cc: Jeff Layton <jlayton@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6: cifs: Cleanup and thus reduce smb session structure and fields used during authentication NTLM auth and sign - Use appropriate server challenge cifs: add kfree() on error path NTLM auth and sign - minor error corrections and cleanup NTLM auth and sign - Use kernel crypto apis to calculate hashes and smb signatures NTLM auth and sign - Define crypto hash functions and create and send keys needed for key exchange cifs: cifs_convert_address() returns zero on error NTLM auth and sign - Allocate session key/client response dynamically cifs: update comments - [s/GlobalSMBSesLock/cifs_file_list_lock/g] cifs: eliminate cifsInodeInfo->write_behind_rc (try #6) [CIFS] Fix checkpatch warnings and bump cifs version number cifs: wait for writeback to complete in cifs_flush cifs: convert cifsFileInfo->count to non-atomic counter
2010-10-28cifs: add kfree() on error pathDan Carpenter
We leak 256 bytes here on this error path. Signed-off-by: Dan Carpenter <error27@gmail.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-26writeback: remove nonblocking/encountered_congestion referencesWu Fengguang
This removes more dead code that was somehow missed by commit 0d99519efef (writeback: remove unused nonblocking and congestion checks). There are no behavior change except for the removal of two entries from one of the ext4 tracing interface. The nonblocking checks in ->writepages are no longer used because the flusher now prefer to block on get_request_wait() than to skip inodes on IO congestion. The latter will lead to more seeky IO. The nonblocking checks in ->writepage are no longer used because it's redundant with the WB_SYNC_NONE check. We no long set ->nonblocking in VM page out and page migration, because a) it's effectively redundant with WB_SYNC_NONE in current code b) it's old semantic of "Don't get stuck on request queues" is mis-behavior: that would skip some dirty inodes on congestion and page out others, which is unfair in terms of LRU age. Inspired by Christoph Hellwig. Thanks! Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: David Howells <dhowells@redhat.com> Cc: Sage Weil <sage@newdream.net> Cc: Steve French <sfrench@samba.org> Cc: Chris Mason <chris.mason@oracle.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-25cifs: update comments - [s/GlobalSMBSesLock/cifs_file_list_lock/g]Suresh Jayaraman
GlobalSMBSesLock is now cifs_file_list_lock. Update comments to reflect this. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-25cifs: eliminate cifsInodeInfo->write_behind_rc (try #6)Jeff Layton
write_behind_rc is redundant and just adds complexity to the code. What we really want to do instead is to use mapping_set_error to reset the flags on the mapping when we find a writeback error and can't report it to userspace yet. For cifs_flush and cifs_fsync, we shouldn't reset the flags since errors returned there do get reported to userspace. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Reviewed-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-25cifs: wait for writeback to complete in cifs_flushJeff Layton
The f_op->flush operation is the last chance to return a writeback related error when closing a file. Ensure that we don't miss reporting any errors by waiting for writeback to complete in cifs_flush before proceeding. There's no reason to do this when the file isn't open for write however. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Reviewed-by: David Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-25cifs: convert cifsFileInfo->count to non-atomic counterJeff Layton
The count for cifsFileInfo is currently an atomic, but that just adds complexity for little value. We generally need to hold cifs_file_list_lock to traverse the lists anyway so we might as well make this counter non-atomic and simply use the cifs_file_list_lock to protect it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-21[CIFS] move close processing from cifs_close to cifsFileInfo_putSteve French
Now that it's feasible for a cifsFileInfo to outlive the filp under which it was created, move the close processing into cifsFileInfo_put. This means that the last user of the filehandle always does the actual on the wire close call. This also allows us to get rid of the closePend flag from cifsFileInfo. If we have an active reference to the file then it's never going to have a close pending. cifs_close is converted to simply put the filehandle. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: move cifsFileInfo_put to file.cJeff Layton
...and make it non-inlined in preparation for the move of most of cifs_close to it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: convert GlobalSMBSeslock from a rwlock to regular spinlockJeff Layton
Convert this lock to a regular spinlock A rwlock_t offers little value here. It's more expensive than a regular spinlock unless you have a fairly large section of code that runs under the read lock and can benefit from the concurrency. Additionally, we need to ensure that the refcounting for files isn't racy and to do that we need to lock areas that can increment it for write. That means that the areas that can actually use a read_lock are very few and relatively infrequently used. While we're at it, change the name to something easier to type, and fix a bug in find_writable_file. cifsFileInfo_put can sleep and shouldn't be called while holding the lock. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: move cifs_new_fileinfo to file.cJeff Layton
It's currently in dir.c which makes little sense... Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: eliminate pfile pointer from cifsFileInfoJeff Layton
All the remaining users of cifsFileInfo->pfile just use it to get at the f_flags/f_mode. Now that we store that separately in the cifsFileInfo, there's no need to consult the pfile at all from a cifsFileInfo pointer. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: cifs_write argument change and cleanupJeff Layton
Have cifs_write take a cifsFileInfo pointer instead of a filp. Since cifsFileInfo holds references on the dentry, and that holds one to the inode, we can eliminate some unneeded NULL pointer checks. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: clean up cifs_reopen_fileJeff Layton
Add a f_flags field that holds the f_flags field from the filp. We'll need this info in case the filp ever goes away before the cifsFileInfo does. Have cifs_reopen_file use that value instead of filp->f_flags too and have it take a cifsFileInfo arg instead of a filp. While we're at it, get rid of some bogus cargo-cult NULL pointer checks in that function and reduce the level of indentation. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: eliminate the inode argument from cifs_new_fileinfoJeff Layton
It already takes a file pointer. The inode associated with that had damn well better be the same one we're passing in anyway. Thus, there's no need for a separate argument here. Also, get rid of the bogus check for a null pCifsInode pointer. The CIFS_I macro uses container_of(), and that will virtually never return a NULL pointer anyway. Finally, move the setting of the canCache* flags outside of the lock. Other places in the code don't hold that lock when setting it, so I assume it's not really needed here either. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: eliminate oflags option from cifs_new_fileinfoJeff Layton
Eliminate the poor, misunderstood "oflags" option from cifs_new_fileinfo. The callers mostly pass in the filp->f_flags here. That's not correct however since we're checking that value for the presence of FMODE_READ. Luckily that only affects how the f_list is ordered. What it really wants here is the file->f_mode. Just use that field from the filp to determine it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-18cifs: fix flags handling in cifs_posix_openJeff Layton
The way flags are passed and converted for cifs_posix_open is rather non-sensical. Some callers call cifs_posix_convert_flags on the flags before they pass them to cifs_posix_open, whereas some don't. Two flag conversion steps is just confusing though. Change the function instead to clearly expect input in f_flags format, and fix the callers to pass that in. Then, have cifs_posix_open call cifs_convert_posix_flags to do the conversion. Move cifs_posix_open to file.c as well so we can keep cifs_convert_posix_flags as a static function. Fix it also to not ignore O_CREAT, O_EXCL and O_TRUNC, and instead have cifs_reopen_file mask those bits off before calling cifs_posix_open. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-15cifs: eliminate cifs_posix_open_inode_helperJeff Layton
cifs: eliminate cifs_posix_open_inode_helper This function is redundant. The only thing it does is set the canCache flags, but those get set in cifs_new_fileinfo anyway. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-10-12cifs: don't use vfsmount to pin superblock for oplock breaksJeff Layton
Filesystems aren't really supposed to do anything with a vfsmount. It's considered a layering violation since vfsmounts are entirely managed at the VFS layer. CIFS currently keeps an active reference to a vfsmount in order to prevent the superblock vanishing before an oplock break has completed. What we really want to do instead is to keep sb->s_active high until the oplock break has completed. This patch borrows the scheme that NFS uses for handling sillyrenames. An atomic_t is added to the cifs_sb_info. When it transitions from 0 to 1, an extra reference to the superblock is taken (by bumping the s_active value). When it transitions from 1 to 0, that reference is dropped and a the superblock teardown may proceed if there are no more references to it. Also, the vfsmount pointer is removed from cifsFileInfo and from cifs_new_fileinfo, and some bogus forward declarations are removed from cifsfs.h. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>