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* FS-Cache: Add a helper to bulk uncache pages on an inodeDavid Howells2011-07-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add an FS-Cache helper to bulk uncache pages on an inode. This will only work for the circumstance where the pages in the cache correspond 1:1 with the pages attached to an inode's page cache. This is required for CIFS and NFS: When disabling inode cookie, we were returning the cookie and setting cifsi->fscache to NULL but failed to invalidate any previously mapped pages. This resulted in "Bad page state" errors and manifested in other kind of errors when running fsstress. Fix it by uncaching mapped pages when we disable the inode cookie. This patch should fix the following oops and "Bad page state" errors seen during fsstress testing. ------------[ cut here ]------------ kernel BUG at fs/cachefiles/namei.c:201! invalid opcode: 0000 [#1] SMP Pid: 5, comm: kworker/u:0 Not tainted 2.6.38.7-30.fc15.x86_64 #1 Bochs Bochs RIP: 0010: cachefiles_walk_to_object+0x436/0x745 [cachefiles] RSP: 0018:ffff88002ce6dd00 EFLAGS: 00010282 RAX: ffff88002ef165f0 RBX: ffff88001811f500 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000282 RBP: ffff88002ce6dda0 R08: 0000000000000100 R09: ffffffff81b3a300 R10: 0000ffff00066c0a R11: 0000000000000003 R12: ffff88002ae54840 R13: ffff88002ae54840 R14: ffff880029c29c00 R15: ffff88001811f4b0 FS: 00007f394dd32720(0000) GS:ffff88002ef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fffcb62ddf8 CR3: 000000001825f000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process kworker/u:0 (pid: 5, threadinfo ffff88002ce6c000, task ffff88002ce55cc0) Stack: 0000000000000246 ffff88002ce55cc0 ffff88002ce6dd58 ffff88001815dc00 ffff8800185246c0 ffff88001811f618 ffff880029c29d18 ffff88001811f380 ffff88002ce6dd50 ffffffff814757e4 ffff88002ce6dda0 ffffffff8106ac56 Call Trace: cachefiles_lookup_object+0x78/0xd4 [cachefiles] fscache_lookup_object+0x131/0x16d [fscache] fscache_object_work_func+0x1bc/0x669 [fscache] process_one_work+0x186/0x298 worker_thread+0xda/0x15d kthread+0x84/0x8c kernel_thread_helper+0x4/0x10 RIP cachefiles_walk_to_object+0x436/0x745 [cachefiles] ---[ end trace 1d481c9af1804caa ]--- I tested the uncaching by the following means: (1) Create a big file on my NFS server (104857600 bytes). (2) Read the file into the cache with md5sum on the NFS client. Look in /proc/fs/fscache/stats: Pages : mrk=25601 unc=0 (3) Open the file for read/write ("bash 5<>/warthog/bigfile"). Look in proc again: Pages : mrk=25601 unc=25601 Reported-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-and-Tested-by: Suresh Jayaraman <sjayaraman@suse.de> cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [CIFS] trivial cleanup fscache cFYI and cERROR messagesSteve French2011-06-141-27/+24
| | | | | | | ... for uniformity and cleaner debug logs. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
* [CIFS] Rename three structures to avoid camel caseSteve French2011-05-271-3/+3
| | | | | | | | | | secMode to sec_mode and cifsTconInfo to cifs_tcon and cifsSesInfo to cifs_ses Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: enable fscache iff fsc mount option is used explicitlySuresh Jayaraman2010-11-301-6/+6
| | | | | | | | | | | | | Currently, if CONFIG_CIFS_FSCACHE is set, fscache is enabled on files opened as read-only irrespective of the 'fsc' mount option. Fix this by enabling fscache only if 'fsc' mount option is specified explicitly. Remove an extraneous cFYI debug message and fix a typo while at it. Reported-by: Jeff Layton <jlayton@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: add cifs_sb_master_tcon and convert some callers to use itJeff Layton2010-09-291-6/+6
| | | | | | | | | | | | | At mount time, we'll always need to create a tcon that will serve as a template for others that are associated with the mount. This tcon is known as the "master" tcon. In some cases, we'll need to use that tcon regardless of who's accessing the mount. Add an accessor function for the master tcon and go ahead and switch the appropriate places to use it. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: add function to get a tcon from cifs_sbJeff Layton2010-09-291-3/+4
| | | | | | | | | | When we convert cifs to do multiple sessions per mount, we'll need more than one tcon per superblock. At that point "cifs_sb->tcon" will make no sense. Add a new accessor function that gets a tcon given a cifs_sb. For now, it just returns cifs_sb->tcon. Later it'll do more. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: read pages from FS-CacheSuresh Jayaraman2010-08-021-0/+73
| | | | | | | | Read pages from a FS-Cache data storage object into a CIFS inode. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: store pages into local cacheSuresh Jayaraman2010-08-021-0/+11
| | | | | | | | Store pages from an CIFS inode into the data storage object associated with that inode. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: FS-Cache page managementSuresh Jayaraman2010-08-021-0/+26
| | | | | | | | | Takes care of invalidation and release of FS-Cache marked pages and also invalidation of the FsCache page flag when the inode is removed. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: define inode-level cache object and register themSuresh Jayaraman2010-08-021-0/+68
| | | | | | | | | | | | Define inode-level data storage objects (managed by cifsInodeInfo structs). Each inode-level object is created in a super-block level object and is itself a data storage object in to which pages from the inode are stored. The inode object is keyed by UniqueId. The coherency data being used is LastWriteTime, LastChangeTime and end of file reported by the server. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: define superblock-level cache index objects and register themSuresh Jayaraman2010-08-021-0/+17
| | | | | | | | | | | | Define superblock-level cache index objects (managed by cifsTconInfo structs). Each superblock object is created in a server-level index object and in itself an index into which inode-level objects are inserted. The superblock object is keyed by sharename. The UniqueId/IndexNumber is used to validate that the exported share is the same since we accessed it last time. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
* cifs: define server-level cache index objects and register themSuresh Jayaraman2010-08-021-0/+41
Define server-level cache index objects (as managed by TCP_ServerInfo structs) and register then with FS-Cache. Each server object is created in the CIFS top-level index object and is itself an index into which superblock-level objects are inserted. The server objects are now keyed by {IPaddress,family,port} tuple. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Steve French <sfrench@us.ibm.com>
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