From 3bc303c254335dbd7c7012cc1760b12f1d5514d3 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Mon, 21 Sep 2009 06:47:50 -0400 Subject: [PATCH] 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 Signed-off-by: Steve French --- fs/cifs/Kconfig | 1 + fs/cifs/cifsfs.c | 95 +++------------------------------------------ fs/cifs/cifsglob.h | 12 +++--- fs/cifs/cifsproto.h | 6 +-- fs/cifs/cifssmb.c | 1 + fs/cifs/connect.c | 1 - fs/cifs/dir.c | 25 ++++++------ fs/cifs/file.c | 74 ++++++++++++++++++++++++++++++++++- fs/cifs/misc.c | 29 +++++++++----- fs/cifs/transport.c | 50 ------------------------ 10 files changed, 119 insertions(+), 175 deletions(-) diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig index 6994a0f54f0..80f35259680 100644 --- a/fs/cifs/Kconfig +++ b/fs/cifs/Kconfig @@ -2,6 +2,7 @@ config CIFS tristate "CIFS support (advanced network filesystem, SMBFS successor)" depends on INET select NLS + select SLOW_WORK help This is the client VFS module for the Common Internet File System (CIFS) protocol which is the successor to the Server Message Block diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 3610e9958b4..89142b39fec 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -64,9 +64,6 @@ unsigned int multiuser_mount = 0; unsigned int extended_security = CIFSSEC_DEF; /* unsigned int ntlmv2_support = 0; */ unsigned int sign_CIFS_PDUs = 1; -extern struct task_struct *oplockThread; /* remove sparse warning */ -struct task_struct *oplockThread = NULL; -/* extern struct task_struct * dnotifyThread; remove sparse warning */ static const struct super_operations cifs_super_ops; unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE; module_param(CIFSMaxBufSize, int, 0); @@ -973,89 +970,12 @@ cifs_destroy_mids(void) kmem_cache_destroy(cifs_oplock_cachep); } -static int cifs_oplock_thread(void *dummyarg) -{ - struct oplock_q_entry *oplock_item; - struct cifsTconInfo *pTcon; - struct inode *inode; - __u16 netfid; - int rc, waitrc = 0; - - set_freezable(); - do { - if (try_to_freeze()) - continue; - - spin_lock(&cifs_oplock_lock); - if (list_empty(&cifs_oplock_list)) { - spin_unlock(&cifs_oplock_lock); - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(39*HZ); - } else { - oplock_item = list_entry(cifs_oplock_list.next, - struct oplock_q_entry, qhead); - cFYI(1, ("found oplock item to write out")); - pTcon = oplock_item->tcon; - inode = oplock_item->pinode; - netfid = oplock_item->netfid; - spin_unlock(&cifs_oplock_lock); - DeleteOplockQEntry(oplock_item); - /* can not grab inode sem here since it would - deadlock when oplock received on delete - since vfs_unlink holds the i_mutex across - the call */ - /* mutex_lock(&inode->i_mutex);*/ - if (S_ISREG(inode->i_mode)) { -#ifdef CONFIG_CIFS_EXPERIMENTAL - if (CIFS_I(inode)->clientCanCacheAll == 0) - break_lease(inode, FMODE_READ); - else if (CIFS_I(inode)->clientCanCacheRead == 0) - break_lease(inode, FMODE_WRITE); -#endif - rc = filemap_fdatawrite(inode->i_mapping); - if (CIFS_I(inode)->clientCanCacheRead == 0) { - waitrc = filemap_fdatawait( - inode->i_mapping); - invalidate_remote_inode(inode); - } - if (rc == 0) - rc = waitrc; - } else - rc = 0; - /* mutex_unlock(&inode->i_mutex);*/ - if (rc) - CIFS_I(inode)->write_behind_rc = rc; - cFYI(1, ("Oplock flush inode %p rc %d", - inode, rc)); - - /* releasing stale oplock after recent reconnect - of smb session using a now incorrect file - handle is not a data integrity issue but do - not bother sending an oplock release if session - to server still is disconnected since oplock - already released by the server in that case */ - if (!pTcon->need_reconnect) { - rc = CIFSSMBLock(0, pTcon, netfid, - 0 /* len */ , 0 /* offset */, 0, - 0, LOCKING_ANDX_OPLOCK_RELEASE, - false /* wait flag */); - cFYI(1, ("Oplock release rc = %d", rc)); - } - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(1); /* yield in case q were corrupt */ - } - } while (!kthread_should_stop()); - - return 0; -} - static int __init init_cifs(void) { int rc = 0; cifs_proc_init(); INIT_LIST_HEAD(&cifs_tcp_ses_list); - INIT_LIST_HEAD(&cifs_oplock_list); #ifdef CONFIG_CIFS_EXPERIMENTAL INIT_LIST_HEAD(&GlobalDnotifyReqList); INIT_LIST_HEAD(&GlobalDnotifyRsp_Q); @@ -1084,7 +1004,6 @@ init_cifs(void) rwlock_init(&GlobalSMBSeslock); rwlock_init(&cifs_tcp_ses_lock); spin_lock_init(&GlobalMid_Lock); - spin_lock_init(&cifs_oplock_lock); if (cifs_max_pending < 2) { cifs_max_pending = 2; @@ -1119,18 +1038,15 @@ init_cifs(void) if (rc) goto out_unregister_key_type; #endif - oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd"); - if (IS_ERR(oplockThread)) { - rc = PTR_ERR(oplockThread); - cERROR(1, ("error %d create oplock thread", rc)); - goto out_unregister_dfs_key_type; - } + rc = slow_work_register_user(); + if (rc) + goto out_unregister_resolver_key; return 0; - out_unregister_dfs_key_type: -#ifdef CONFIG_CIFS_DFS_UPCALL + out_unregister_resolver_key: unregister_key_type(&key_type_dns_resolver); +#ifdef CONFIG_CIFS_DFS_UPCALL out_unregister_key_type: #endif #ifdef CONFIG_CIFS_UPCALL @@ -1165,7 +1081,6 @@ exit_cifs(void) cifs_destroy_inodecache(); cifs_destroy_mids(); cifs_destroy_request_bufs(); - kthread_stop(oplockThread); } MODULE_AUTHOR("Steve French "); diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index c19419a38f6..5d0fde18039 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -18,6 +18,7 @@ */ #include #include +#include #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; diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index bf3ae881b2d..733e71b57c7 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -86,17 +86,13 @@ extern int CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, const int stage, const struct nls_table *nls_cp); extern __u16 GetNextMid(struct TCP_Server_Info *server); -extern struct oplock_q_entry *AllocOplockQEntry(struct inode *, u16, - struct cifsTconInfo *); -extern void DeleteOplockQEntry(struct oplock_q_entry *); -extern void DeleteTconOplockQEntries(struct cifsTconInfo *); extern struct timespec cifs_NTtimeToUnix(__le64 utc_nanoseconds_since_1601); extern u64 cifs_UnixTimeToNT(struct timespec); extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time, int offset); extern int cifs_posix_open(char *full_path, struct inode **pinode, - struct super_block *sb, int mode, int oflags, + struct vfsmount *mnt, int mode, int oflags, __u32 *poplock, __u16 *pnetfid, int xid); extern void cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info, diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 301e307e127..941441d3e38 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -94,6 +94,7 @@ static void mark_open_files_invalid(struct cifsTconInfo *pTcon) list_for_each_safe(tmp, tmp1, &pTcon->openFileList) { open_file = list_entry(tmp, struct cifsFileInfo, tlist); open_file->invalidHandle = true; + open_file->oplock_break_cancelled = true; } write_unlock(&GlobalSMBSeslock); /* BB Add call to invalidate_inodes(sb) for all superblocks mounted diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index d49682433c2..43003e0bef1 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1670,7 +1670,6 @@ cifs_put_tcon(struct cifsTconInfo *tcon) CIFSSMBTDis(xid, tcon); _FreeXid(xid); - DeleteTconOplockQEntries(tcon); tconInfoFree(tcon); cifs_put_smb_ses(ses); } diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 36435502b5e..9a5df7a8469 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "cifsfs.h" #include "cifspdu.h" #include "cifsglob.h" @@ -131,11 +132,12 @@ cifs_bp_rename_retry: static void cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle, - struct cifsTconInfo *tcon, bool write_only) + struct vfsmount *mnt, bool write_only) { int oplock = 0; struct cifsFileInfo *pCifsFile; struct cifsInodeInfo *pCifsInode; + struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb); pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); @@ -148,17 +150,19 @@ cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle, pCifsFile->netfid = fileHandle; pCifsFile->pid = current->tgid; pCifsFile->pInode = igrab(newinode); + pCifsFile->mnt = mnt; pCifsFile->invalidHandle = false; pCifsFile->closePend = false; mutex_init(&pCifsFile->fh_mutex); mutex_init(&pCifsFile->lock_mutex); INIT_LIST_HEAD(&pCifsFile->llist); atomic_set(&pCifsFile->count, 1); + slow_work_init(&pCifsFile->oplock_break, &cifs_oplock_break_ops); /* set the following in open now pCifsFile->pfile = file; */ write_lock(&GlobalSMBSeslock); - list_add(&pCifsFile->tlist, &tcon->openFileList); + list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList); pCifsInode = CIFS_I(newinode); if (pCifsInode) { /* if readable file instance put first in list*/ @@ -179,14 +183,14 @@ cifs_fill_fileinfo(struct inode *newinode, __u16 fileHandle, } int cifs_posix_open(char *full_path, struct inode **pinode, - struct super_block *sb, int mode, int oflags, + struct vfsmount *mnt, int mode, int oflags, __u32 *poplock, __u16 *pnetfid, int xid) { int rc; bool write_only = false; FILE_UNIX_BASIC_INFO *presp_data; __u32 posix_flags = 0; - struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + struct cifs_sb_info *cifs_sb = CIFS_SB(mnt->mnt_sb); struct cifs_fattr fattr; cFYI(1, ("posix open %s", full_path)); @@ -243,7 +247,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode, /* get new inode and set it up */ if (*pinode == NULL) { - *pinode = cifs_iget(sb, &fattr); + *pinode = cifs_iget(mnt->mnt_sb, &fattr); if (!*pinode) { rc = -ENOMEM; goto posix_open_ret; @@ -252,7 +256,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode, cifs_fattr_to_inode(*pinode, &fattr); } - cifs_fill_fileinfo(*pinode, *pnetfid, cifs_sb->tcon, write_only); + cifs_fill_fileinfo(*pinode, *pnetfid, mnt, write_only); posix_open_ret: kfree(presp_data); @@ -322,7 +326,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode, if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))) { - rc = cifs_posix_open(full_path, &newinode, inode->i_sb, + rc = cifs_posix_open(full_path, &newinode, nd->path.mnt, mode, oflags, &oplock, &fileHandle, xid); /* EIO could indicate that (posix open) operation is not supported, despite what server claimed in capability @@ -469,8 +473,8 @@ cifs_create_set_dentry: /* mknod case - do not leave file open */ CIFSSMBClose(xid, tcon, fileHandle); } else if (!(posix_create) && (newinode)) { - cifs_fill_fileinfo(newinode, fileHandle, - cifs_sb->tcon, write_only); + cifs_fill_fileinfo(newinode, fileHandle, nd->path.mnt, + write_only); } cifs_create_out: kfree(buf); @@ -682,8 +686,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, if (!(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) && (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open && (nd->intent.open.flags & O_CREAT)) { - rc = cifs_posix_open(full_path, &newInode, - parent_dir_inode->i_sb, + rc = cifs_posix_open(full_path, &newInode, nd->path.mnt, nd->intent.open.create_mode, nd->intent.open.flags, &oplock, &fileHandle, xid); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index b976cea2410..90f61786f51 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include "cifsfs.h" #include "cifspdu.h" @@ -51,11 +52,13 @@ static inline struct cifsFileInfo *cifs_init_private( INIT_LIST_HEAD(&private_data->llist); private_data->pfile = file; /* needed for writepage */ private_data->pInode = igrab(inode); + private_data->mnt = file->f_path.mnt; private_data->invalidHandle = false; private_data->closePend = false; /* Initialize reference count to one. The private data is freed on the release of the last reference */ atomic_set(&private_data->count, 1); + slow_work_init(&private_data->oplock_break, &cifs_oplock_break_ops); return private_data; } @@ -327,7 +330,7 @@ int cifs_open(struct inode *inode, struct file *file) le64_to_cpu(tcon->fsUnixInfo.Capability))) { int oflags = (int) cifs_posix_convert_flags(file->f_flags); /* can not refresh inode info since size could be stale */ - rc = cifs_posix_open(full_path, &inode, inode->i_sb, + rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, cifs_sb->mnt_file_mode /* ignored */, oflags, &oplock, &netfid, xid); if (rc == 0) { @@ -547,7 +550,7 @@ reopen_error_exit: le64_to_cpu(tcon->fsUnixInfo.Capability))) { int oflags = (int) cifs_posix_convert_flags(file->f_flags); /* can not refresh inode info since size could be stale */ - rc = cifs_posix_open(full_path, NULL, inode->i_sb, + rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, cifs_sb->mnt_file_mode /* ignored */, oflags, &oplock, &netfid, xid); if (rc == 0) { @@ -2312,6 +2315,73 @@ out: return rc; } +static void +cifs_oplock_break(struct slow_work *work) +{ + struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, + oplock_break); + struct inode *inode = cfile->pInode; + struct cifsInodeInfo *cinode = CIFS_I(inode); + struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); + int rc, waitrc = 0; + + if (inode && S_ISREG(inode->i_mode)) { +#ifdef CONFIG_CIFS_EXPERIMENTAL + if (cinode->clientCanCacheAll == 0) + break_lease(inode, FMODE_READ); + else if (cinode->clientCanCacheRead == 0) + break_lease(inode, FMODE_WRITE); +#endif + rc = filemap_fdatawrite(inode->i_mapping); + if (cinode->clientCanCacheRead == 0) { + waitrc = filemap_fdatawait(inode->i_mapping); + invalidate_remote_inode(inode); + } + if (!rc) + rc = waitrc; + if (rc) + cinode->write_behind_rc = rc; + cFYI(1, ("Oplock flush inode %p rc %d", inode, rc)); + } + + /* + * releasing stale oplock after recent reconnect of smb session using + * a now incorrect file handle is not a data integrity issue but do + * not bother sending an oplock release if session to server still is + * disconnected since oplock already released by the server + */ + if (!cfile->closePend && !cfile->oplock_break_cancelled) { + rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, + LOCKING_ANDX_OPLOCK_RELEASE, false); + cFYI(1, ("Oplock release rc = %d", rc)); + } +} + +static int +cifs_oplock_break_get(struct slow_work *work) +{ + struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, + oplock_break); + mntget(cfile->mnt); + cifsFileInfo_get(cfile); + return 0; +} + +static void +cifs_oplock_break_put(struct slow_work *work) +{ + struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, + oplock_break); + mntput(cfile->mnt); + cifsFileInfo_put(cfile); +} + +const struct slow_work_ops cifs_oplock_break_ops = { + .get_ref = cifs_oplock_break_get, + .put_ref = cifs_oplock_break_put, + .execute = cifs_oplock_break, +}; + const struct address_space_operations cifs_addr_ops = { .readpage = cifs_readpage, .readpages = cifs_readpages, diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 191e6220bc7..0241b25ac33 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -32,7 +32,6 @@ extern mempool_t *cifs_sm_req_poolp; extern mempool_t *cifs_req_poolp; -extern struct task_struct *oplockThread; /* The xid serves as a useful identifier for each incoming vfs request, in a similar way to the mid which is useful to track each sent smb, @@ -500,6 +499,7 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) struct cifsTconInfo *tcon; struct cifsInodeInfo *pCifsInode; struct cifsFileInfo *netfile; + int rc; cFYI(1, ("Checking for oplock break or dnotify response")); if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && @@ -569,19 +569,30 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) if (pSMB->Fid != netfile->netfid) continue; - read_unlock(&GlobalSMBSeslock); - read_unlock(&cifs_tcp_ses_lock); + /* + * don't do anything if file is about to be + * closed anyway. + */ + if (netfile->closePend) { + read_unlock(&GlobalSMBSeslock); + read_unlock(&cifs_tcp_ses_lock); + return true; + } + cFYI(1, ("file id match, oplock break")); pCifsInode = CIFS_I(netfile->pInode); pCifsInode->clientCanCacheAll = false; if (pSMB->OplockLevel == 0) pCifsInode->clientCanCacheRead = false; - AllocOplockQEntry(netfile->pInode, - netfile->netfid, tcon); - cFYI(1, ("about to wake up oplock thread")); - if (oplockThread) - wake_up_process(oplockThread); - + rc = slow_work_enqueue(&netfile->oplock_break); + if (rc) { + cERROR(1, ("failed to enqueue oplock " + "break: %d\n", rc)); + } else { + netfile->oplock_break_cancelled = false; + } + read_unlock(&GlobalSMBSeslock); + read_unlock(&cifs_tcp_ses_lock); return true; } read_unlock(&GlobalSMBSeslock); diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index 1da4ab250ea..07b8e71544e 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -103,56 +103,6 @@ DeleteMidQEntry(struct mid_q_entry *midEntry) mempool_free(midEntry, cifs_mid_poolp); } -struct oplock_q_entry * -AllocOplockQEntry(struct inode *pinode, __u16 fid, struct cifsTconInfo *tcon) -{ - struct oplock_q_entry *temp; - if ((pinode == NULL) || (tcon == NULL)) { - cERROR(1, ("Null parms passed to AllocOplockQEntry")); - return NULL; - } - temp = (struct oplock_q_entry *) kmem_cache_alloc(cifs_oplock_cachep, - GFP_KERNEL); - if (temp == NULL) - return temp; - else { - temp->pinode = pinode; - temp->tcon = tcon; - temp->netfid = fid; - spin_lock(&cifs_oplock_lock); - list_add_tail(&temp->qhead, &cifs_oplock_list); - spin_unlock(&cifs_oplock_lock); - } - return temp; -} - -void DeleteOplockQEntry(struct oplock_q_entry *oplockEntry) -{ - spin_lock(&cifs_oplock_lock); - /* should we check if list empty first? */ - list_del(&oplockEntry->qhead); - spin_unlock(&cifs_oplock_lock); - kmem_cache_free(cifs_oplock_cachep, oplockEntry); -} - - -void DeleteTconOplockQEntries(struct cifsTconInfo *tcon) -{ - struct oplock_q_entry *temp; - - if (tcon == NULL) - return; - - spin_lock(&cifs_oplock_lock); - list_for_each_entry(temp, &cifs_oplock_list, qhead) { - if ((temp->tcon) && (temp->tcon == tcon)) { - list_del(&temp->qhead); - kmem_cache_free(cifs_oplock_cachep, temp); - } - } - spin_unlock(&cifs_oplock_lock); -} - static int smb_sendv(struct TCP_Server_Info *server, struct kvec *iov, int n_vec) {