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Diffstat (limited to 'fs/coda/file.c')
-rw-r--r--fs/coda/file.c143
1 files changed, 119 insertions, 24 deletions
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 1cbc1f2298ee..128d63df5bfb 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -20,22 +20,43 @@
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
+#include <linux/uio.h>
#include <linux/coda.h>
-#include <linux/coda_psdev.h>
-
+#include "coda_psdev.h"
#include "coda_linux.h"
#include "coda_int.h"
+struct coda_vm_ops {
+ atomic_t refcnt;
+ struct file *coda_file;
+ const struct vm_operations_struct *host_vm_ops;
+ struct vm_operations_struct vm_ops;
+};
+
static ssize_t
coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *coda_file = iocb->ki_filp;
- struct coda_file_info *cfi = CODA_FTOC(coda_file);
+ 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;
- BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+ 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
@@ -43,13 +64,18 @@ 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 coda_file_info *cfi = coda_ftoc(coda_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;
- BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+ 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;
- host_file = cfi->cfi_container;
file_start_write(host_file);
inode_lock(coda_inode);
ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
@@ -58,26 +84,73 @@ 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;
}
+static void
+coda_vm_open(struct vm_area_struct *vma)
+{
+ struct coda_vm_ops *cvm_ops =
+ container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
+
+ atomic_inc(&cvm_ops->refcnt);
+
+ if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->open)
+ cvm_ops->host_vm_ops->open(vma);
+}
+
+static void
+coda_vm_close(struct vm_area_struct *vma)
+{
+ struct coda_vm_ops *cvm_ops =
+ container_of(vma->vm_ops, struct coda_vm_ops, vm_ops);
+
+ if (cvm_ops->host_vm_ops && cvm_ops->host_vm_ops->close)
+ cvm_ops->host_vm_ops->close(vma);
+
+ if (atomic_dec_and_test(&cvm_ops->refcnt)) {
+ vma->vm_ops = cvm_ops->host_vm_ops;
+ fput(cvm_ops->coda_file);
+ kfree(cvm_ops);
+ }
+}
+
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;
-
- cfi = CODA_FTOC(coda_file);
- BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
- host_file = cfi->cfi_container;
+ struct coda_vm_ops *cvm_ops;
+ loff_t ppos;
+ size_t count;
+ int ret;
if (!host_file->f_op->mmap)
return -ENODEV;
- coda_inode = file_inode(coda_file);
- host_inode = file_inode(host_file);
+ 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;
cii = ITOC(coda_inode);
spin_lock(&cii->c_lock);
@@ -89,6 +162,7 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
* the container file on us! */
else if (coda_inode->i_mapping != host_inode->i_mapping) {
spin_unlock(&cii->c_lock);
+ kfree(cvm_ops);
return -EBUSY;
}
@@ -97,7 +171,29 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
cfi->cfi_mapcount++;
spin_unlock(&cii->c_lock);
- return call_mmap(host_file, vma);
+ vma->vm_file = get_file(host_file);
+ ret = call_mmap(vma->vm_file, vma);
+
+ if (ret) {
+ /* if call_mmap fails, our caller will put coda_file so we
+ * should drop the reference to the host_file that we got.
+ */
+ fput(host_file);
+ kfree(cvm_ops);
+ } else {
+ /* here we add redirects for the open/close vm_operations */
+ cvm_ops->host_vm_ops = vma->vm_ops;
+ if (vma->vm_ops)
+ cvm_ops->vm_ops = *vma->vm_ops;
+
+ cvm_ops->vm_ops.open = coda_vm_open;
+ cvm_ops->vm_ops.close = coda_vm_close;
+ cvm_ops->coda_file = coda_file;
+ atomic_set(&cvm_ops->refcnt, 1);
+
+ vma->vm_ops = &cvm_ops->vm_ops;
+ }
+ return ret;
}
int coda_open(struct inode *coda_inode, struct file *coda_file)
@@ -127,6 +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;
@@ -142,8 +240,7 @@ int coda_release(struct inode *coda_inode, struct file *coda_file)
struct inode *host_inode;
int err;
- cfi = CODA_FTOC(coda_file);
- BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+ cfi = coda_ftoc(coda_file);
err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
coda_flags, coda_file->f_cred->fsuid);
@@ -185,8 +282,7 @@ int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
return err;
inode_lock(coda_inode);
- cfi = CODA_FTOC(coda_file);
- BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
+ cfi = coda_ftoc(coda_file);
host_file = cfi->cfi_container;
err = vfs_fsync(host_file, datasync);
@@ -207,4 +303,3 @@ const struct file_operations coda_file_operations = {
.fsync = coda_fsync,
.splice_read = generic_file_splice_read,
};
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 00:50:58 +0000