#include "fid.h"
#include "cache.h"
-static const struct file_operations v9fs_cached_file_operations;
-static const struct file_operations v9fs_cached_file_operations_dotl;
+static const struct vm_operations_struct v9fs_file_vm_ops;
/**
* v9fs_file_open - open a file (or directory)
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
+ struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
+ v9inode = V9FS_I(inode);
v9ses = v9fs_inode2v9ses(inode);
if (v9fs_proto_dotl(v9ses))
omode = file->f_flags;
}
file->private_data = fid;
- if ((fid->qid.version) && (v9ses->cache)) {
- P9_DPRINTK(P9_DEBUG_VFS, "cached");
- /* enable cached file options */
- if(file->f_op == &v9fs_file_operations)
- file->f_op = &v9fs_cached_file_operations;
- else if (file->f_op == &v9fs_file_operations_dotl)
- file->f_op = &v9fs_cached_file_operations_dotl;
-
+ if (v9ses->cache && !v9inode->writeback_fid) {
+ /*
+ * clone a fid and add it to writeback_fid
+ * we do it during open time instead of
+ * page dirty time via write_begin/page_mkwrite
+ * because we want write after unlink usecase
+ * to work.
+ */
+ fid = v9fs_writeback_fid(file->f_path.dentry);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ goto out_error;
+ }
+ v9inode->writeback_fid = (void *) fid;
+ }
#ifdef CONFIG_9P_FSCACHE
+ if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, file);
#endif
- }
-
return 0;
+out_error:
+ p9_client_clunk(file->private_data);
+ file->private_data = NULL;
+ return err;
}
/**
}
/**
- * v9fs_file_readn - read from a file
- * @filp: file pointer to read
+ * v9fs_fid_readn - read from a fid
+ * @fid: fid to read
* @data: data buffer to read data into
* @udata: user data buffer to read data into
* @count: size of buffer
* @offset: offset at which to read data
*
*/
-
ssize_t
-v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
+v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
u64 offset)
{
int n, total, size;
- struct p9_fid *fid = filp->private_data;
P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
- (long long unsigned) offset, count);
-
+ (long long unsigned) offset, count);
n = 0;
total = 0;
size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
return total;
}
+/**
+ * v9fs_file_readn - read from a file
+ * @filp: file pointer to read
+ * @data: data buffer to read data into
+ * @udata: user data buffer to read data into
+ * @count: size of buffer
+ * @offset: offset at which to read data
+ *
+ */
+ssize_t
+v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
+ u64 offset)
+{
+ return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
+}
+
/**
* v9fs_file_read - read from a file
* @filp: file pointer to read
return ret;
}
-/**
- * v9fs_file_write - write to a file
- * @filp: file pointer to write
- * @data: data buffer to write data from
- * @count: size of buffer
- * @offset: offset at which to write data
- *
- */
-
-static ssize_t
-v9fs_file_write(struct file *filp, const char __user * data,
- size_t count, loff_t * offset)
+ssize_t
+v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
+ const char __user *data, size_t count,
+ loff_t *offset, int invalidate)
{
- ssize_t retval;
- size_t total = 0;
int n;
- struct p9_fid *fid;
+ loff_t i_size;
+ size_t total = 0;
struct p9_client *clnt;
- struct inode *inode = filp->f_path.dentry->d_inode;
loff_t origin = *offset;
unsigned long pg_start, pg_end;
P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
(int)count, (int)*offset);
- fid = filp->private_data;
clnt = fid->clnt;
-
- retval = generic_write_checks(filp, &origin, &count, 0);
- if (retval)
- goto out;
-
- retval = -EINVAL;
- if ((ssize_t) count < 0)
- goto out;
- retval = 0;
- if (!count)
- goto out;
-
do {
n = p9_client_write(fid, NULL, data+total, origin+total, count);
if (n <= 0)
total += n;
} while (count > 0);
- if (total > 0) {
+ if (invalidate && (total > 0)) {
pg_start = origin >> PAGE_CACHE_SHIFT;
pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
if (inode->i_mapping && inode->i_mapping->nrpages)
invalidate_inode_pages2_range(inode->i_mapping,
pg_start, pg_end);
*offset += total;
- i_size_write(inode, i_size_read(inode) + total);
- inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
+ i_size = i_size_read(inode);
+ if (*offset > i_size) {
+ inode_add_bytes(inode, *offset - i_size);
+ i_size_write(inode, *offset);
+ }
}
-
if (n < 0)
- retval = n;
- else
- retval = total;
+ return n;
+
+ return total;
+}
+
+/**
+ * v9fs_file_write - write to a file
+ * @filp: file pointer to write
+ * @data: data buffer to write data from
+ * @count: size of buffer
+ * @offset: offset at which to write data
+ *
+ */
+static ssize_t
+v9fs_file_write(struct file *filp, const char __user * data,
+ size_t count, loff_t *offset)
+{
+ ssize_t retval = 0;
+ loff_t origin = *offset;
+
+
+ retval = generic_write_checks(filp, &origin, &count, 0);
+ if (retval)
+ goto out;
+
+ retval = -EINVAL;
+ if ((ssize_t) count < 0)
+ goto out;
+ retval = 0;
+ if (!count)
+ goto out;
+
+ return v9fs_file_write_internal(filp->f_path.dentry->d_inode,
+ filp->private_data,
+ data, count, offset, 1);
out:
return retval;
}
+
static int v9fs_file_fsync(struct file *filp, int datasync)
{
struct p9_fid *fid;
return retval;
}
-static const struct file_operations v9fs_cached_file_operations = {
+static int
+v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ int retval;
+
+ retval = generic_file_mmap(file, vma);
+ if (!retval)
+ vma->vm_ops = &v9fs_file_vm_ops;
+
+ return retval;
+}
+
+static int
+v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct v9fs_inode *v9inode;
+ struct page *page = vmf->page;
+ struct file *filp = vma->vm_file;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+
+
+ P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
+ page, (unsigned long)filp->private_data);
+
+ v9inode = V9FS_I(inode);
+ /* make sure the cache has finished storing the page */
+ v9fs_fscache_wait_on_page_write(inode, page);
+ BUG_ON(!v9inode->writeback_fid);
+ lock_page(page);
+ if (page->mapping != inode->i_mapping)
+ goto out_unlock;
+
+ return VM_FAULT_LOCKED;
+out_unlock:
+ unlock_page(page);
+ return VM_FAULT_NOPAGE;
+}
+
+static ssize_t
+v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
+ loff_t *offsetp)
+{
+ loff_t size, offset;
+ struct inode *inode;
+ struct address_space *mapping;
+
+ offset = *offsetp;
+ mapping = filp->f_mapping;
+ inode = mapping->host;
+ if (!count)
+ return 0;
+ size = i_size_read(inode);
+ if (offset < size)
+ filemap_write_and_wait_range(mapping, offset,
+ offset + count - 1);
+
+ return v9fs_file_read(filp, udata, count, offsetp);
+}
+
+/**
+ * v9fs_cached_file_read - read from a file
+ * @filp: file pointer to read
+ * @udata: user data buffer to read data into
+ * @count: size of buffer
+ * @offset: offset at which to read data
+ *
+ */
+static ssize_t
+v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
+ loff_t *offset)
+{
+ if (filp->f_flags & O_DIRECT)
+ return v9fs_direct_read(filp, data, count, offset);
+ return do_sync_read(filp, data, count, offset);
+}
+
+static ssize_t
+v9fs_direct_write(struct file *filp, const char __user * data,
+ size_t count, loff_t *offsetp)
+{
+ loff_t offset;
+ ssize_t retval;
+ struct inode *inode;
+ struct address_space *mapping;
+
+ offset = *offsetp;
+ mapping = filp->f_mapping;
+ inode = mapping->host;
+ if (!count)
+ return 0;
+
+ mutex_lock(&inode->i_mutex);
+ retval = filemap_write_and_wait_range(mapping, offset,
+ offset + count - 1);
+ if (retval)
+ goto err_out;
+ /*
+ * After a write we want buffered reads to be sure to go to disk to get
+ * the new data. We invalidate clean cached page from the region we're
+ * about to write. We do this *before* the write so that if we fail
+ * here we fall back to buffered write
+ */
+ if (mapping->nrpages) {
+ pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
+ pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
+
+ retval = invalidate_inode_pages2_range(mapping,
+ pg_start, pg_end);
+ /*
+ * If a page can not be invalidated, fall back
+ * to buffered write.
+ */
+ if (retval) {
+ if (retval == -EBUSY)
+ goto buff_write;
+ goto err_out;
+ }
+ }
+ retval = v9fs_file_write(filp, data, count, offsetp);
+err_out:
+ mutex_unlock(&inode->i_mutex);
+ return retval;
+
+buff_write:
+ mutex_unlock(&inode->i_mutex);
+ return do_sync_write(filp, data, count, offsetp);
+}
+
+/**
+ * v9fs_cached_file_write - write to a file
+ * @filp: file pointer to write
+ * @data: data buffer to write data from
+ * @count: size of buffer
+ * @offset: offset at which to write data
+ *
+ */
+static ssize_t
+v9fs_cached_file_write(struct file *filp, const char __user * data,
+ size_t count, loff_t *offset)
+{
+
+ if (filp->f_flags & O_DIRECT)
+ return v9fs_direct_write(filp, data, count, offset);
+ return do_sync_write(filp, data, count, offset);
+}
+
+static const struct vm_operations_struct v9fs_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = v9fs_vm_page_mkwrite,
+};
+
+
+const struct file_operations v9fs_cached_file_operations = {
.llseek = generic_file_llseek,
- .read = do_sync_read,
+ .read = v9fs_cached_file_read,
+ .write = v9fs_cached_file_write,
.aio_read = generic_file_aio_read,
- .write = v9fs_file_write,
+ .aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock,
- .mmap = generic_file_readonly_mmap,
+ .mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync,
};
-static const struct file_operations v9fs_cached_file_operations_dotl = {
+const struct file_operations v9fs_cached_file_operations_dotl = {
.llseek = generic_file_llseek,
- .read = do_sync_read,
+ .read = v9fs_cached_file_read,
+ .write = v9fs_cached_file_write,
.aio_read = generic_file_aio_read,
- .write = v9fs_file_write,
+ .aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock_dotl,
.flock = v9fs_file_flock_dotl,
- .mmap = generic_file_readonly_mmap,
+ .mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync_dotl,
};
projects / mirror_ubuntu-bionic-kernel.git / blobdiff