diff options
| -rw-r--r-- | fs/cifs/cifsfs.c | 4 | ||||
| -rw-r--r-- | fs/cifs/cifsglob.h | 47 | ||||
| -rw-r--r-- | fs/cifs/cifsproto.h | 18 | ||||
| -rw-r--r-- | fs/cifs/cifssmb.c | 26 | ||||
| -rw-r--r-- | fs/cifs/smb2ops.c | 1 | ||||
| -rw-r--r-- | fs/cifs/smb2pdu.c | 123 | ||||
| -rw-r--r-- | fs/cifs/smb2pdu.h | 30 | ||||
| -rw-r--r-- | fs/cifs/smb2proto.h | 1 |
8 files changed, 206 insertions, 44 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index db8a404a51dd..2829f374dbf7 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -89,6 +89,10 @@ extern mempool_t *cifs_mid_poolp; struct workqueue_struct *cifsiod_wq; +#ifdef CONFIG_HIGHMEM +DEFINE_MUTEX(cifs_kmap_mutex); +#endif + static int cifs_read_super(struct super_block *sb) { diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index aef167470654..330f6259bb6d 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -582,6 +582,33 @@ get_next_mid(struct TCP_Server_Info *server) #define CIFS_KMAP_SIZE_LIMIT (1<<24) #endif /* CONFIG_HIGHMEM */ +#ifdef CONFIG_HIGHMEM +/* + * On arches that have high memory, kmap address space is limited. By + * serializing the kmap operations on those arches, we ensure that we don't + * end up with a bunch of threads in writeback with partially mapped page + * arrays, stuck waiting for kmap to come back. That situation prevents + * progress and can deadlock. + */ + +extern struct mutex cifs_kmap_mutex; + +static inline void +cifs_kmap_lock(void) +{ + mutex_lock(&cifs_kmap_mutex); +} + +static inline void +cifs_kmap_unlock(void) +{ + mutex_unlock(&cifs_kmap_mutex); +} +#else /* !CONFIG_HIGHMEM */ +#define cifs_kmap_lock() do { ; } while (0) +#define cifs_kmap_unlock() do { ; } while (0) +#endif /* CONFIG_HIGHMEM */ + /* * Macros to allow the TCP_Server_Info->net field and related code to drop out * when CONFIG_NET_NS isn't set. @@ -891,6 +918,26 @@ struct cifs_readdata { struct kvec iov[1]; }; +struct cifs_writedata; + +/* asynchronous write support */ +struct cifs_writedata { + struct kref refcount; + struct list_head list; + struct completion done; + enum writeback_sync_modes sync_mode; + struct work_struct work; + struct cifsFileInfo *cfile; + __u64 offset; + pid_t pid; + unsigned int bytes; + int result; + void (*marshal_iov) (struct kvec *iov, + struct cifs_writedata *wdata); + unsigned int nr_pages; + struct page *pages[1]; +}; + /* * Take a reference on the file private data. Must be called with * cifs_file_list_lock held. diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 6656eb5dbf70..8b320c7b582c 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -468,24 +468,6 @@ void cifs_readdata_release(struct kref *refcount); int cifs_async_readv(struct cifs_readdata *rdata); int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid); -/* asynchronous write support */ -struct cifs_writedata { - struct kref refcount; - struct list_head list; - struct completion done; - enum writeback_sync_modes sync_mode; - struct work_struct work; - struct cifsFileInfo *cfile; - __u64 offset; - pid_t pid; - unsigned int bytes; - int result; - void (*marshal_iov) (struct kvec *iov, - struct cifs_writedata *wdata); - unsigned int nr_pages; - struct page *pages[1]; -}; - int cifs_async_writev(struct cifs_writedata *wdata); void cifs_writev_complete(struct work_struct *work); struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages, diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 2a9b27387708..f27b13ea08b8 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -86,32 +86,6 @@ static struct { #endif /* CONFIG_CIFS_WEAK_PW_HASH */ #endif /* CIFS_POSIX */ -#ifdef CONFIG_HIGHMEM -/* - * On arches that have high memory, kmap address space is limited. By - * serializing the kmap operations on those arches, we ensure that we don't - * end up with a bunch of threads in writeback with partially mapped page - * arrays, stuck waiting for kmap to come back. That situation prevents - * progress and can deadlock. - */ -static DEFINE_MUTEX(cifs_kmap_mutex); - -static inline void -cifs_kmap_lock(void) -{ - mutex_lock(&cifs_kmap_mutex); -} - -static inline void -cifs_kmap_unlock(void) -{ - mutex_unlock(&cifs_kmap_mutex); -} -#else /* !CONFIG_HIGHMEM */ -#define cifs_kmap_lock() do { ; } while(0) -#define cifs_kmap_unlock() do { ; } while(0) -#endif /* CONFIG_HIGHMEM */ - /* * Mark as invalid, all open files on tree connections since they * were closed when session to server was lost. diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index d9ca357d9809..da31235023fb 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -434,6 +434,7 @@ struct smb_version_operations smb21_operations = { .close = smb2_close_file, .flush = smb2_flush_file, .async_readv = smb2_async_readv, + .async_writev = smb2_async_writev, }; struct smb_version_values smb21_values = { diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index e18671852d41..cb6acc7b1ca8 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -33,6 +33,7 @@ #include <linux/vfs.h> #include <linux/task_io_accounting_ops.h> #include <linux/uaccess.h> +#include <linux/pagemap.h> #include <linux/xattr.h> #include "smb2pdu.h" #include "cifsglob.h" @@ -1327,3 +1328,125 @@ smb2_async_readv(struct cifs_readdata *rdata) cifs_small_buf_release(buf); return rc; } + +/* + * Check the mid_state and signature on received buffer (if any), and queue the + * workqueue completion task. + */ +static void +smb2_writev_callback(struct mid_q_entry *mid) +{ + struct cifs_writedata *wdata = mid->callback_data; + struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); + unsigned int written; + struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; + unsigned int credits_received = 1; + + switch (mid->mid_state) { + case MID_RESPONSE_RECEIVED: + credits_received = le16_to_cpu(rsp->hdr.CreditRequest); + wdata->result = smb2_check_receive(mid, tcon->ses->server, 0); + if (wdata->result != 0) + break; + + written = le32_to_cpu(rsp->DataLength); + /* + * Mask off high 16 bits when bytes written as returned + * by the server is greater than bytes requested by the + * client. OS/2 servers are known to set incorrect + * CountHigh values. + */ + if (written > wdata->bytes) + written &= 0xFFFF; + + if (written < wdata->bytes) + wdata->result = -ENOSPC; + else + wdata->bytes = written; + break; + case MID_REQUEST_SUBMITTED: + case MID_RETRY_NEEDED: + wdata->result = -EAGAIN; + break; + default: + wdata->result = -EIO; + break; + } + + if (wdata->result) + cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); + + queue_work(cifsiod_wq, &wdata->work); + DeleteMidQEntry(mid); + add_credits(tcon->ses->server, credits_received, 0); +} + +/* smb2_async_writev - send an async write, and set up mid to handle result */ +int +smb2_async_writev(struct cifs_writedata *wdata) +{ + int i, rc = -EACCES; + struct smb2_write_req *req = NULL; + struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); + struct kvec *iov = NULL; + + rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req); + if (rc) + goto async_writev_out; + + /* 1 iov per page + 1 for header */ + iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS); + if (iov == NULL) { + rc = -ENOMEM; + goto async_writev_out; + } + + req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid); + + req->PersistentFileId = wdata->cfile->fid.persistent_fid; + req->VolatileFileId = wdata->cfile->fid.volatile_fid; + req->WriteChannelInfoOffset = 0; + req->WriteChannelInfoLength = 0; + req->Channel = 0; + req->Offset = cpu_to_le64(wdata->offset); + /* 4 for rfc1002 length field */ + req->DataOffset = cpu_to_le16( + offsetof(struct smb2_write_req, Buffer) - 4); + req->RemainingBytes = 0; + + /* 4 for rfc1002 length field and 1 for Buffer */ + iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; + iov[0].iov_base = (char *)req; + + /* + * This function should marshal up the page array into the kvec + * array, reserving [0] for the header. It should kmap the pages + * and set the iov_len properly for each one. It may also set + * wdata->bytes too. + */ + cifs_kmap_lock(); + wdata->marshal_iov(iov, wdata); + cifs_kmap_unlock(); + + cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes); + + req->Length = cpu_to_le32(wdata->bytes); + + inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */); + + kref_get(&wdata->refcount); + rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1, + NULL, smb2_writev_callback, wdata, 0); + + if (rc) + kref_put(&wdata->refcount, cifs_writedata_release); + + /* send is done, unmap pages */ + for (i = 0; i < wdata->nr_pages; i++) + kunmap(wdata->pages[i]); + +async_writev_out: + cifs_small_buf_release(req); + kfree(iov); + return rc; +} diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index 4abb58106809..21ec9ed280f9 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -496,6 +496,36 @@ struct smb2_read_rsp { __u8 Buffer[1]; } __packed; +/* For write request Flags field below the following flag is defined: */ +#define SMB2_WRITEFLAG_WRITE_THROUGH 0x00000001 + +struct smb2_write_req { + struct smb2_hdr hdr; + __le16 StructureSize; /* Must be 49 */ + __le16 DataOffset; /* offset from start of SMB2 header to write data */ + __le32 Length; + __le64 Offset; + __u64 PersistentFileId; /* opaque endianness */ + __u64 VolatileFileId; /* opaque endianness */ + __le32 Channel; /* Reserved MBZ */ + __le32 RemainingBytes; + __le16 WriteChannelInfoOffset; /* Reserved MBZ */ + __le16 WriteChannelInfoLength; /* Reserved MBZ */ + __le32 Flags; + __u8 Buffer[1]; +} __packed; + +struct smb2_write_rsp { + struct smb2_hdr hdr; + __le16 StructureSize; /* Must be 17 */ + __u8 DataOffset; + __u8 Reserved; + __le32 DataLength; + __le32 DataRemaining; + __u32 Reserved2; + __u8 Buffer[1]; +} __packed; + struct smb2_echo_req { struct smb2_hdr hdr; __le16 StructureSize; /* Must be 4 */ diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h index f442e4699974..ec983be0ba31 100644 --- a/fs/cifs/smb2proto.h +++ b/fs/cifs/smb2proto.h @@ -98,6 +98,7 @@ extern int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid); extern int smb2_async_readv(struct cifs_readdata *rdata); +extern int smb2_async_writev(struct cifs_writedata *wdata); extern int SMB2_echo(struct TCP_Server_Info *server); #endif /* _SMB2PROTO_H */ |