@@ -40,6 +40,7 @@ struct coda_file_info {
int cfi_magic; /* magic number */
struct file *cfi_container; /* container file for this cnode */
unsigned int cfi_mapcount; /* nr of times this file is mapped */
+ bool cfi_access_intent; /* is access intent supported */
};
/* flags */
@@ -83,6 +83,9 @@ int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out,
size_t nbytes);
int venus_fsync(struct super_block *sb, struct CodaFid *fid);
int venus_statfs(struct dentry *dentry, struct kstatfs *sfs);
+int venus_access_intent(struct super_block *sb, struct CodaFid *fid,
+ bool *access_intent_supported,
+ size_t count, loff_t ppos, int type);
/*
* Statistics
@@ -20,6 +20,7 @@
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <linux/coda.h>
#include "coda_psdev.h"
@@ -37,9 +38,25 @@ static ssize_t
coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *coda_file = iocb->ki_filp;
+ struct inode *coda_inode = file_inode(coda_file);
struct coda_file_info *cfi = coda_ftoc(coda_file);
+ loff_t ki_pos = iocb->ki_pos;
+ size_t count = iov_iter_count(to);
+ ssize_t ret;
+
+ ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ count, ki_pos, CODA_ACCESS_TYPE_READ);
+ if (ret)
+ goto finish_read;
- return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
+ ret = vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
+
+finish_read:
+ venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ count, ki_pos, CODA_ACCESS_TYPE_READ_FINISH);
+ return ret;
}
static ssize_t
@@ -48,10 +65,17 @@ coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
struct file *coda_file = iocb->ki_filp;
struct inode *coda_inode = file_inode(coda_file);
struct coda_file_info *cfi = coda_ftoc(coda_file);
- struct file *host_file;
+ struct file *host_file = cfi->cfi_container;
+ loff_t ki_pos = iocb->ki_pos;
+ size_t count = iov_iter_count(to);
ssize_t ret;
- host_file = cfi->cfi_container;
+ ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ count, ki_pos, CODA_ACCESS_TYPE_WRITE);
+ if (ret)
+ goto finish_write;
+
file_start_write(host_file);
inode_lock(coda_inode);
ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
@@ -60,6 +84,11 @@ coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
inode_unlock(coda_inode);
file_end_write(host_file);
+
+finish_write:
+ venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ count, ki_pos, CODA_ACCESS_TYPE_WRITE_FINISH);
return ret;
}
@@ -94,29 +123,35 @@ coda_vm_close(struct vm_area_struct *vma)
static int
coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
{
- struct coda_file_info *cfi;
+ struct inode *coda_inode = file_inode(coda_file);
+ struct coda_file_info *cfi = coda_ftoc(coda_file);
+ struct file *host_file = cfi->cfi_container;
+ struct inode *host_inode = file_inode(host_file);
struct coda_inode_info *cii;
- struct file *host_file;
- struct inode *coda_inode, *host_inode;
struct coda_vm_ops *cvm_ops;
+ loff_t ppos;
+ size_t count;
int ret;
- cfi = coda_ftoc(coda_file);
- host_file = cfi->cfi_container;
-
if (!host_file->f_op->mmap)
return -ENODEV;
if (WARN_ON(coda_file != vma->vm_file))
return -EIO;
+ count = vma->vm_end - vma->vm_start;
+ ppos = vma->vm_pgoff * PAGE_SIZE;
+
+ ret = venus_access_intent(coda_inode->i_sb, coda_i2f(coda_inode),
+ &cfi->cfi_access_intent,
+ count, ppos, CODA_ACCESS_TYPE_MMAP);
+ if (ret)
+ return ret;
+
cvm_ops = kmalloc(sizeof(struct coda_vm_ops), GFP_KERNEL);
if (!cvm_ops)
return -ENOMEM;
- coda_inode = file_inode(coda_file);
- host_inode = file_inode(host_file);
-
cii = ITOC(coda_inode);
spin_lock(&cii->c_lock);
coda_file->f_mapping = host_file->f_mapping;
@@ -188,6 +223,8 @@ int coda_open(struct inode *coda_inode, struct file *coda_file)
cfi->cfi_magic = CODA_MAGIC;
cfi->cfi_mapcount = 0;
cfi->cfi_container = host_file;
+ /* assume access intents are supported unless we hear otherwise */
+ cfi->cfi_access_intent = true;
BUG_ON(coda_file->private_data != NULL);
coda_file->private_data = cfi;
@@ -392,7 +392,7 @@ MODULE_AUTHOR("Jan Harkes, Peter J. Braam");
MODULE_DESCRIPTION("Coda Distributed File System VFS interface");
MODULE_ALIAS_CHARDEV_MAJOR(CODA_PSDEV_MAJOR);
MODULE_LICENSE("GPL");
-MODULE_VERSION("6.11");
+MODULE_VERSION("7.0");
static int __init init_coda(void)
{
@@ -569,6 +569,47 @@ int venus_statfs(struct dentry *dentry, struct kstatfs *sfs)
return error;
}
+int venus_access_intent(struct super_block *sb, struct CodaFid *fid,
+ bool *access_intent_supported,
+ size_t count, loff_t ppos, int type)
+{
+ union inputArgs *inp;
+ union outputArgs *outp;
+ int insize, outsize, error;
+ bool finalizer =
+ type == CODA_ACCESS_TYPE_READ_FINISH ||
+ type == CODA_ACCESS_TYPE_WRITE_FINISH;
+
+ if (!*access_intent_supported && !finalizer)
+ return 0;
+
+ insize = SIZE(access_intent);
+ UPARG(CODA_ACCESS_INTENT);
+
+ inp->coda_access_intent.VFid = *fid;
+ inp->coda_access_intent.count = count;
+ inp->coda_access_intent.pos = ppos;
+ inp->coda_access_intent.type = type;
+
+ error = coda_upcall(coda_vcp(sb), insize,
+ finalizer ? NULL : &outsize, inp);
+
+ /*
+ * we have to free the request buffer for synchronous upcalls
+ * or when asynchronous upcalls fail, but not when asynchronous
+ * upcalls succeed
+ */
+ if (!finalizer || error)
+ kvfree(inp);
+
+ /* Chunked access is not supported or an old Coda client */
+ if (error == -EOPNOTSUPP) {
+ *access_intent_supported = false;
+ error = 0;
+ }
+ return error;
+}
+
/*
* coda_upcall and coda_downcall routines.
*/
@@ -598,10 +639,12 @@ static void coda_unblock_signals(sigset_t *old)
* has seen them,
* - CODA_CLOSE or CODA_RELEASE upcall (to avoid reference count problems)
* - CODA_STORE (to avoid data loss)
+ * - CODA_ACCESS_INTENT (to avoid reference count problems)
*/
#define CODA_INTERRUPTIBLE(r) (!coda_hard && \
(((r)->uc_opcode != CODA_CLOSE && \
(r)->uc_opcode != CODA_STORE && \
+ (r)->uc_opcode != CODA_ACCESS_INTENT && \
(r)->uc_opcode != CODA_RELEASE) || \
(r)->uc_flags & CODA_REQ_READ))
@@ -687,21 +730,25 @@ static int coda_upcall(struct venus_comm *vcp,
goto exit;
}
+ buffer->ih.unique = ++vcp->vc_seq;
+
req->uc_data = (void *)buffer;
- req->uc_flags = 0;
+ req->uc_flags = outSize ? 0 : CODA_REQ_ASYNC;
req->uc_inSize = inSize;
- req->uc_outSize = *outSize ? *outSize : inSize;
- req->uc_opcode = ((union inputArgs *)buffer)->ih.opcode;
- req->uc_unique = ++vcp->vc_seq;
+ req->uc_outSize = (outSize && *outSize) ? *outSize : inSize;
+ req->uc_opcode = buffer->ih.opcode;
+ req->uc_unique = buffer->ih.unique;
init_waitqueue_head(&req->uc_sleep);
- /* Fill in the common input args. */
- ((union inputArgs *)buffer)->ih.unique = req->uc_unique;
-
/* Append msg to pending queue and poke Venus. */
list_add_tail(&req->uc_chain, &vcp->vc_pending);
-
wake_up_interruptible(&vcp->vc_waitq);
+
+ if (req->uc_flags & CODA_REQ_ASYNC) {
+ mutex_unlock(&vcp->vc_mutex);
+ return 0;
+ }
+
/* We can be interrupted while we wait for Venus to process
* our request. If the interrupt occurs before Venus has read
* the request, we dequeue and return. If it occurs after the
@@ -743,20 +790,20 @@ static int coda_upcall(struct venus_comm *vcp,
sig_req = kmalloc(sizeof(struct upc_req), GFP_KERNEL);
if (!sig_req) goto exit;
- sig_req->uc_data = kvzalloc(sizeof(struct coda_in_hdr), GFP_KERNEL);
- if (!sig_req->uc_data) {
+ sig_inputArgs = kvzalloc(sizeof(struct coda_in_hdr), GFP_KERNEL);
+ if (!sig_inputArgs) {
kfree(sig_req);
goto exit;
}
error = -EINTR;
- sig_inputArgs = (union inputArgs *)sig_req->uc_data;
sig_inputArgs->ih.opcode = CODA_SIGNAL;
sig_inputArgs->ih.unique = req->uc_unique;
sig_req->uc_flags = CODA_REQ_ASYNC;
sig_req->uc_opcode = sig_inputArgs->ih.opcode;
sig_req->uc_unique = sig_inputArgs->ih.unique;
+ sig_req->uc_data = (void *)sig_inputArgs;
sig_req->uc_inSize = sizeof(struct coda_in_hdr);
sig_req->uc_outSize = sizeof(struct coda_in_hdr);
@@ -911,4 +958,3 @@ int coda_downcall(struct venus_comm *vcp, int opcode, union outputArgs *out,
iput(inode);
return 0;
}
-
@@ -271,7 +271,8 @@ struct coda_statfs {
#define CODA_STATFS 34
#define CODA_STORE 35
#define CODA_RELEASE 36
-#define CODA_NCALLS 37
+#define CODA_ACCESS_INTENT 37
+#define CODA_NCALLS 38
#define DOWNCALL(opcode) (opcode >= CODA_REPLACE && opcode <= CODA_PURGEFID)
@@ -281,8 +282,12 @@ struct coda_statfs {
#define CIOC_KERNEL_VERSION _IOWR('c', 10, size_t)
+// CODA_KERNEL_VERSION 0 /* don't care about kernel version number */
+// CODA_KERNEL_VERSION 1 /* The old venus 4.6 compatible interface */
+// CODA_KERNEL_VERSION 2 /* venus_lookup gets an extra parameter */
// CODA_KERNEL_VERSION 3 /* 128-bit file identifiers */
-#define CODA_KERNEL_VERSION 4 /* 64-bit timespec */
+// CODA_KERNEL_VERSION 4 /* 64-bit timespec */
+#define CODA_KERNEL_VERSION 5 /* access intent support */
/*
* Venus <-> Coda RPC arguments
@@ -637,6 +642,25 @@ struct coda_statfs_out {
struct coda_statfs stat;
};
+#define CODA_ACCESS_TYPE_READ 1
+#define CODA_ACCESS_TYPE_WRITE 2
+#define CODA_ACCESS_TYPE_MMAP 3
+#define CODA_ACCESS_TYPE_READ_FINISH 4
+#define CODA_ACCESS_TYPE_WRITE_FINISH 5
+
+/* coda_access_intent: NO_OUT */
+struct coda_access_intent_in {
+ struct coda_in_hdr ih;
+ struct CodaFid VFid;
+ int count;
+ int pos;
+ int type;
+};
+
+struct coda_access_intent_out {
+ struct coda_out_hdr out;
+};
+
/*
* Occasionally, we don't cache the fid returned by CODA_LOOKUP.
* For instance, if the fid is inconsistent.
@@ -668,6 +692,7 @@ union inputArgs {
struct coda_open_by_fd_in coda_open_by_fd;
struct coda_open_by_path_in coda_open_by_path;
struct coda_statfs_in coda_statfs;
+ struct coda_access_intent_in coda_access_intent;
};
union outputArgs {