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author | Jeff Layton <jlayton@redhat.com> | 2009-09-21 06:47:50 -0400 |
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committer | Steve French <sfrench@us.ibm.com> | 2009-09-24 18:33:18 +0000 |
commit | 3bc303c254335dbd7c7012cc1760b12f1d5514d3 (patch) | |
tree | 7da17fbfd697216d9ed0ccd64ea9c03aaf3d52c1 /fs/cifs/cifsglob.h | |
parent | 48541bd3dd4739b4d574b44ea47660c88d833677 (diff) | |
download | kernel_samsung_tuna-3bc303c254335dbd7c7012cc1760b12f1d5514d3.zip kernel_samsung_tuna-3bc303c254335dbd7c7012cc1760b12f1d5514d3.tar.gz kernel_samsung_tuna-3bc303c254335dbd7c7012cc1760b12f1d5514d3.tar.bz2 |
cifs: convert oplock breaks to use slow_work facility (try #4)
This is the fourth respin of the patch to convert oplock breaks to
use the slow_work facility.
A customer of ours was testing a backport of one of the earlier
patchsets, and hit a "Busy inodes after umount..." problem. An oplock
break job had raced with a umount, and the superblock got torn down and
its memory reused. When the oplock break job tried to dereference the
inode->i_sb, the kernel oopsed.
This patchset has the oplock break job hold an inode and vfsmount
reference until the oplock break completes. With this, there should be
no need to take a tcon reference (the vfsmount implicitly holds one
already).
Currently, when an oplock break comes in there's a chance that the
oplock break job won't occur if the allocation of the oplock_q_entry
fails. There are also some rather nasty races in the allocation and
handling these structs.
Rather than allocating oplock queue entries when an oplock break comes
in, add a few extra fields to the cifsFileInfo struct. Get rid of the
dedicated cifs_oplock_thread as well and queue the oplock break job to
the slow_work thread pool.
This approach also has the advantage that the oplock break jobs can
potentially run in parallel rather than be serialized like they are
today.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
-rw-r--r-- | fs/cifs/cifsglob.h | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index c19419a..5d0fde1 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -18,6 +18,7 @@ */ #include <linux/in.h> #include <linux/in6.h> +#include <linux/slow-work.h> #include "cifs_fs_sb.h" #include "cifsacl.h" /* @@ -346,14 +347,16 @@ struct cifsFileInfo { /* lock scope id (0 if none) */ struct file *pfile; /* needed for writepage */ struct inode *pInode; /* needed for oplock break */ + struct vfsmount *mnt; struct mutex lock_mutex; struct list_head llist; /* list of byte range locks we have. */ bool closePend:1; /* file is marked to close */ bool invalidHandle:1; /* file closed via session abend */ - bool messageMode:1; /* for pipes: message vs byte mode */ + bool oplock_break_cancelled:1; atomic_t count; /* reference count */ struct mutex fh_mutex; /* prevents reopen race after dead ses*/ struct cifs_search_info srch_inf; + struct slow_work oplock_break; /* slow_work job for oplock breaks */ }; /* Take a reference on the file private data */ @@ -670,12 +673,6 @@ GLOBAL_EXTERN rwlock_t cifs_tcp_ses_lock; */ GLOBAL_EXTERN rwlock_t GlobalSMBSeslock; -/* Global list of oplocks */ -GLOBAL_EXTERN struct list_head cifs_oplock_list; - -/* Protects the cifs_oplock_list */ -GLOBAL_EXTERN spinlock_t cifs_oplock_lock; - /* Outstanding dir notify requests */ GLOBAL_EXTERN struct list_head GlobalDnotifyReqList; /* DirNotify response queue */ @@ -726,3 +723,4 @@ GLOBAL_EXTERN unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ GLOBAL_EXTERN unsigned int cifs_min_small; /* min size of small buf pool */ GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/ +extern const struct slow_work_ops cifs_oplock_break_ops; |