It makes no sense to maintain 2 parallel systems for reading in pages.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
return status;
}
-static int nfs3_proc_read(struct nfs_read_data *rdata)
-{
- int flags = rdata->flags;
- struct inode * inode = rdata->inode;
- struct nfs_fattr * fattr = rdata->res.fattr;
- struct rpc_message msg = {
- .rpc_proc = &nfs3_procedures[NFS3PROC_READ],
- .rpc_argp = &rdata->args,
- .rpc_resp = &rdata->res,
- .rpc_cred = rdata->cred,
- };
- int status;
-
- dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
- (long long) rdata->args.offset);
- nfs_fattr_init(fattr);
- status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
- if (status >= 0)
- nfs_refresh_inode(inode, fattr);
- dprintk("NFS reply read: %d\n", status);
- return status;
-}
-
/*
* Create a regular file.
* For now, we don't implement O_EXCL.
.lookup = nfs3_proc_lookup,
.access = nfs3_proc_access,
.readlink = nfs3_proc_readlink,
- .read = nfs3_proc_read,
.create = nfs3_proc_create,
.remove = nfs3_proc_remove,
.unlink_setup = nfs3_proc_unlink_setup,
return err;
}
-static int _nfs4_proc_read(struct nfs_read_data *rdata)
-{
- int flags = rdata->flags;
- struct inode *inode = rdata->inode;
- struct nfs_fattr *fattr = rdata->res.fattr;
- struct nfs_server *server = NFS_SERVER(inode);
- struct rpc_message msg = {
- .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
- .rpc_argp = &rdata->args,
- .rpc_resp = &rdata->res,
- .rpc_cred = rdata->cred,
- };
- unsigned long timestamp = jiffies;
- int status;
-
- dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
- (long long) rdata->args.offset);
-
- nfs_fattr_init(fattr);
- status = rpc_call_sync(server->client, &msg, flags);
- if (!status)
- renew_lease(server, timestamp);
- dprintk("NFS reply read: %d\n", status);
- return status;
-}
-
-static int nfs4_proc_read(struct nfs_read_data *rdata)
-{
- struct nfs4_exception exception = { };
- int err;
- do {
- err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
- _nfs4_proc_read(rdata),
- &exception);
- } while (exception.retry);
- return err;
-}
-
/*
* Got race?
* We will need to arrange for the VFS layer to provide an atomic open.
.lookup = nfs4_proc_lookup,
.access = nfs4_proc_access,
.readlink = nfs4_proc_readlink,
- .read = nfs4_proc_read,
.create = nfs4_proc_create,
.remove = nfs4_proc_remove,
.unlink_setup = nfs4_proc_unlink_setup,
return status;
}
-static int nfs_proc_read(struct nfs_read_data *rdata)
-{
- int flags = rdata->flags;
- struct inode * inode = rdata->inode;
- struct nfs_fattr * fattr = rdata->res.fattr;
- struct rpc_message msg = {
- .rpc_proc = &nfs_procedures[NFSPROC_READ],
- .rpc_argp = &rdata->args,
- .rpc_resp = &rdata->res,
- .rpc_cred = rdata->cred,
- };
- int status;
-
- dprintk("NFS call read %d @ %Ld\n", rdata->args.count,
- (long long) rdata->args.offset);
- nfs_fattr_init(fattr);
- status = rpc_call_sync(NFS_CLIENT(inode), &msg, flags);
- if (status >= 0) {
- nfs_refresh_inode(inode, fattr);
- /* Emulate the eof flag, which isn't normally needed in NFSv2
- * as it is guaranteed to always return the file attributes
- */
- if (rdata->args.offset + rdata->args.count >= fattr->size)
- rdata->res.eof = 1;
- }
- dprintk("NFS reply read: %d\n", status);
- return status;
-}
-
static int
nfs_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nameidata *nd)
.lookup = nfs_proc_lookup,
.access = NULL, /* access */
.readlink = nfs_proc_readlink,
- .read = nfs_proc_read,
.create = nfs_proc_create,
.remove = nfs_proc_remove,
.unlink_setup = nfs_proc_unlink_setup,
*
* Partial copy of Linus' read cache modifications to fs/nfs/file.c
* modified for async RPC by okir@monad.swb.de
- *
- * We do an ugly hack here in order to return proper error codes to the
- * user program when a read request failed: since generic_file_read
- * only checks the return value of inode->i_op->readpage() which is always 0
- * for async RPC, we set the error bit of the page to 1 when an error occurs,
- * and make nfs_readpage transmit requests synchronously when encountering this.
- * This is only a small problem, though, since we now retry all operations
- * within the RPC code when root squashing is suspected.
*/
#include <linux/time.h>
}
}
-/*
- * Read a page synchronously.
- */
-static int nfs_readpage_sync(struct nfs_open_context *ctx, struct inode *inode,
- struct page *page)
-{
- unsigned int rsize = NFS_SERVER(inode)->rsize;
- unsigned int count = PAGE_CACHE_SIZE;
- int result = -ENOMEM;
- struct nfs_read_data *rdata;
-
- rdata = nfs_readdata_alloc(count);
- if (!rdata)
- goto out_unlock;
-
- memset(rdata, 0, sizeof(*rdata));
- rdata->flags = (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
- rdata->cred = ctx->cred;
- rdata->inode = inode;
- INIT_LIST_HEAD(&rdata->pages);
- rdata->args.fh = NFS_FH(inode);
- rdata->args.context = ctx;
- rdata->args.pages = &page;
- rdata->args.pgbase = 0UL;
- rdata->args.count = rsize;
- rdata->res.fattr = &rdata->fattr;
-
- dprintk("NFS: nfs_readpage_sync(%p)\n", page);
-
- /*
- * This works now because the socket layer never tries to DMA
- * into this buffer directly.
- */
- do {
- if (count < rsize)
- rdata->args.count = count;
- rdata->res.count = rdata->args.count;
- rdata->args.offset = page_offset(page) + rdata->args.pgbase;
-
- dprintk("NFS: nfs_proc_read(%s, (%s/%Ld), %Lu, %u)\n",
- NFS_SERVER(inode)->nfs_client->cl_hostname,
- inode->i_sb->s_id,
- (long long)NFS_FILEID(inode),
- (unsigned long long)rdata->args.pgbase,
- rdata->args.count);
-
- lock_kernel();
- result = NFS_PROTO(inode)->read(rdata);
- unlock_kernel();
-
- /*
- * Even if we had a partial success we can't mark the page
- * cache valid.
- */
- if (result < 0) {
- if (result == -EISDIR)
- result = -EINVAL;
- goto io_error;
- }
- count -= result;
- rdata->args.pgbase += result;
- nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, result);
-
- /* Note: result == 0 should only happen if we're caching
- * a write that extends the file and punches a hole.
- */
- if (rdata->res.eof != 0 || result == 0)
- break;
- } while (count);
- spin_lock(&inode->i_lock);
- NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
- spin_unlock(&inode->i_lock);
-
- if (rdata->res.eof || rdata->res.count == rdata->args.count) {
- SetPageUptodate(page);
- if (rdata->res.eof && count != 0)
- memclear_highpage_flush(page, rdata->args.pgbase, count);
- }
- result = 0;
-
-io_error:
- nfs_readdata_free(rdata);
-out_unlock:
- unlock_page(page);
- return result;
-}
-
static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
struct page *page)
{
} else
ctx = get_nfs_open_context((struct nfs_open_context *)
file->private_data);
- if (!IS_SYNC(inode)) {
- error = nfs_readpage_async(ctx, inode, page);
- goto out;
- }
- error = nfs_readpage_sync(ctx, inode, page);
- if (error < 0 && IS_SWAPFILE(inode))
- printk("Aiee.. nfs swap-in of page failed!\n");
-out:
+ error = nfs_readpage_async(ctx, inode, page);
+
put_nfs_open_context(ctx);
return error;
int (*access) (struct inode *, struct nfs_access_entry *);
int (*readlink)(struct inode *, struct page *, unsigned int,
unsigned int);
- int (*read) (struct nfs_read_data *);
int (*create) (struct inode *, struct dentry *,
struct iattr *, int, struct nameidata *);
int (*remove) (struct inode *, struct qstr *);
projects / linux-2.6 / commitdiff