diff options
author | Pavel Shilovsky <pshilovsky@etersoft.ru> | 2012-09-19 17:22:44 +0400 |
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committer | Steve French <smfrench@gmail.com> | 2012-09-25 06:46:33 +0400 |
commit | b140799a11adb6023d5f96712874c37b71dab290 (patch) | |
tree | 7b2dc7493db1b65b0d8c03901b86fb9e967c76c5 | |
parent | f7ba7fe685bc3ed8fd0687870e68b2567d17357f (diff) | |
download | linux-b140799a11adb6023d5f96712874c37b71dab290.tar.xz |
CIFS: Use brlock cache for SMB2
Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r-- | fs/cifs/smb2file.c | 91 | ||||
-rw-r--r-- | fs/cifs/smb2ops.c | 3 | ||||
-rw-r--r-- | fs/cifs/smb2proto.h | 1 |
3 files changed, 94 insertions, 1 deletions
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index a25ea02149e7..181e13d9f9db 100644 --- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -201,3 +201,94 @@ smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, kfree(buf); return rc; } + +static int +smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid, + struct smb2_lock_element *buf, unsigned int max_num) +{ + int rc = 0, stored_rc; + struct cifsFileInfo *cfile = fdlocks->cfile; + struct cifsLockInfo *li; + unsigned int num = 0; + struct smb2_lock_element *cur = buf; + struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); + + list_for_each_entry(li, &fdlocks->locks, llist) { + cur->Length = cpu_to_le64(li->length); + cur->Offset = cpu_to_le64(li->offset); + cur->Flags = cpu_to_le32(li->type | + SMB2_LOCKFLAG_FAIL_IMMEDIATELY); + if (++num == max_num) { + stored_rc = smb2_lockv(xid, tcon, + cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + current->tgid, num, buf); + if (stored_rc) + rc = stored_rc; + cur = buf; + num = 0; + } else + cur++; + } + if (num) { + stored_rc = smb2_lockv(xid, tcon, + cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + current->tgid, num, buf); + if (stored_rc) + rc = stored_rc; + } + + return rc; +} + +int +smb2_push_mandatory_locks(struct cifsFileInfo *cfile) +{ + int rc = 0, stored_rc; + unsigned int xid; + unsigned int max_num, max_buf; + struct smb2_lock_element *buf; + struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); + struct cifs_fid_locks *fdlocks; + + xid = get_xid(); + mutex_lock(&cinode->lock_mutex); + if (!cinode->can_cache_brlcks) { + mutex_unlock(&cinode->lock_mutex); + free_xid(xid); + return rc; + } + + /* + * Accessing maxBuf is racy with cifs_reconnect - need to store value + * and check it for zero before using. + */ + max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; + if (!max_buf) { + mutex_unlock(&cinode->lock_mutex); + free_xid(xid); + return -EINVAL; + } + + max_num = max_buf / sizeof(struct smb2_lock_element); + buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL); + if (!buf) { + mutex_unlock(&cinode->lock_mutex); + free_xid(xid); + return -ENOMEM; + } + + list_for_each_entry(fdlocks, &cinode->llist, llist) { + stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num); + if (stored_rc) + rc = stored_rc; + } + + cinode->can_cache_brlcks = false; + kfree(buf); + + mutex_unlock(&cinode->lock_mutex); + free_xid(xid); + return rc; +} diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index caed2c57896d..0808b238219b 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -371,7 +371,7 @@ smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock) cfile->fid.persistent_fid = fid->persistent_fid; cfile->fid.volatile_fid = fid->volatile_fid; smb2_set_oplock_level(cinode, oplock); - /* cinode->can_cache_brlcks = cinode->clientCanCacheAll; */ + cinode->can_cache_brlcks = cinode->clientCanCacheAll; } static int @@ -615,6 +615,7 @@ struct smb_version_operations smb21_operations = { .queryfs = smb2_queryfs, .mand_lock = smb2_mand_lock, .mand_unlock_range = smb2_unlock_range, + .push_mand_locks = smb2_push_mandatory_locks, }; struct smb_version_values smb21_values = { diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h index ab19152b092b..8b4d3712255b 100644 --- a/fs/cifs/smb2proto.h +++ b/fs/cifs/smb2proto.h @@ -86,6 +86,7 @@ extern int smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, extern void smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock); extern int smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, const unsigned int xid); +extern int smb2_push_mandatory_locks(struct cifsFileInfo *cfile); /* * SMB2 Worker functions - most of protocol specific implementation details |