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Add Hooks for Linux File Operations

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The Linux specific file operations have all been located in the
file zpl_file.c.  These functions primarily rely on the reworked
zfs_* functions to do their job.  They are also responsible for
converting the possible Solaris style error codes to negative
Linux errors.

This first zpl_* commit also includes a common zpl.h header with
minimal entries to register the Linux specific hooks.  In also
adds all the new zpl_* file to the Makefile.in.  This is not a
standalone commit, you required the following zpl_* commits.
This commit is contained in:
Brian Behlendorf 2011-01-26 12:03:58 -08:00
parent 633e8030b3
commit 1efb473f89
7 changed files with 251 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/sys/Makefile.am
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@ -75,6 +75,7 @@ KERNEL_H = \
$(top_srcdir)/include/sys/blkdev.h \
$(top_srcdir)/include/sys/zfs_ioctl.h \
$(top_srcdir)/include/sys/zfs_onexit.h \
${top_srcdir}/include/sys/zpl.h \
$(top_srcdir)/include/sys/zvol.h
USER_H =

2
include/sys/Makefile.in
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@ -163,6 +163,7 @@ am__kernel_HEADERS_DIST = $(top_srcdir)/include/sys/arc.h \
$(top_srcdir)/include/sys/blkdev.h \
$(top_srcdir)/include/sys/zfs_ioctl.h \
$(top_srcdir)/include/sys/zfs_onexit.h \
${top_srcdir}/include/sys/zpl.h \
$(top_srcdir)/include/sys/zvol.h
am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
am__vpath_adj = case $$p in \
@ -531,6 +532,7 @@ KERNEL_H = \
$(top_srcdir)/include/sys/blkdev.h \
$(top_srcdir)/include/sys/zfs_ioctl.h \
$(top_srcdir)/include/sys/zfs_onexit.h \
${top_srcdir}/include/sys/zpl.h \
$(top_srcdir)/include/sys/zvol.h
USER_H =

63
include/sys/zpl.h Normal file
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@ -0,0 +1,63 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
*/
#ifndef _SYS_ZPL_H
#define _SYS_ZPL_H
#include <sys/vfs.h>
/* zpl_inode.c */
extern const struct inode_operations zpl_inode_operations;
extern const struct inode_operations zpl_dir_inode_operations;
extern const struct inode_operations zpl_symlink_inode_operations;
extern const struct inode_operations zpl_special_inode_operations;
/* zpl_file.c */
extern ssize_t zpl_read_common(struct inode *ip, const char *buf,
size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
extern ssize_t zpl_write_common(struct inode *ip, const char *buf,
size_t len, loff_t pos, uio_seg_t segment, int flags, cred_t *cr);
extern const struct address_space_operations zpl_address_space_operations;
extern const struct file_operations zpl_file_operations;
extern const struct file_operations zpl_dir_file_operations;
/* zpl_super.c */
typedef struct zpl_mount_data {
const char *z_osname; /* Dataset name */
void *z_data; /* Mount options string */
struct vfsmount *z_vfs; /* VFS mount point */
} zpl_mount_data_t;
extern const struct super_operations zpl_super_operations;
/* extern const struct export_operations zpl_export_operations; */
extern struct file_system_type zpl_fs_type;
/* zpl_xattr.c */
extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip);
extern struct xattr_handler *zpl_xattr_handlers[];
#endif /* _SYS_ZPL_H */

4
lib/libzpool/Makefile.am
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@ -106,5 +106,9 @@ EXTRA_DIST = \
$(top_srcdir)/module/zfs/zfs_rlock.c \
$(top_srcdir)/module/zfs/zfs_vfsops.c \
$(top_srcdir)/module/zfs/zfs_vnops.c \
$(top_srcdir)/module/zfs/zpl_file.c \
$(top_srcdir)/module/zfs/zpl_inode.c \
$(top_srcdir)/module/zfs/zpl_super.c \
$(top_srcdir)/module/zfs/zpl_xattr.c \
$(top_srcdir)/module/zfs/zvol.c \
$(top_srcdir)/module/zpios/pios.c

4
lib/libzpool/Makefile.in
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@ -427,6 +427,10 @@ EXTRA_DIST = \
$(top_srcdir)/module/zfs/zfs_rlock.c \
$(top_srcdir)/module/zfs/zfs_vfsops.c \
$(top_srcdir)/module/zfs/zfs_vnops.c \
$(top_srcdir)/module/zfs/zpl_file.c \
$(top_srcdir)/module/zfs/zpl_inode.c \
$(top_srcdir)/module/zfs/zpl_super.c \
$(top_srcdir)/module/zfs/zpl_xattr.c \
$(top_srcdir)/module/zfs/zvol.c \
$(top_srcdir)/module/zpios/pios.c

4
module/zfs/Makefile.in
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@ -83,5 +83,9 @@ $(MODULE)-objs += @top_srcdir@/module/zfs/zio_checksum.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zio_compress.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zio_inject.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zle.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zpl_file.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zpl_inode.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zpl_super.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zpl_xattr.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zrlock.o
$(MODULE)-objs += @top_srcdir@/module/zfs/zvol.o

173
module/zfs/zpl_file.c Normal file
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@ -0,0 +1,173 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
*/
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
#include <sys/zpl.h>
static int
zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_path.dentry;
cred_t *cr;
int error;
cr = (cred_t *)get_current_cred();
error = -zfs_readdir(dentry->d_inode, dirent, filldir,
&filp->f_pos, cr);
put_cred(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_fsync(struct file *filp, struct dentry *dentry, int datasync)
{
cred_t *cr;
int error;
cr = (cred_t *)get_current_cred();
error = -zfs_fsync(filp->f_path.dentry->d_inode, datasync, cr);
put_cred(cr);
ASSERT3S(error, <=, 0);
return (error);
}
ssize_t
zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
uio_seg_t segment, int flags, cred_t *cr)
{
int error;
struct iovec iov;
uio_t uio;
iov.iov_base = (void *)buf;
iov.iov_len = len;
uio.uio_iov = &iov;
uio.uio_resid = len;
uio.uio_iovcnt = 1;
uio.uio_loffset = pos;
uio.uio_limit = MAXOFFSET_T;
uio.uio_segflg = segment;
error = -zfs_read(ip, &uio, flags, cr);
if (error < 0)
return (error);
return (len - uio.uio_resid);
}
static ssize_t
zpl_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
{
cred_t *cr;
ssize_t read;
cr = (cred_t *)get_current_cred();
read = zpl_read_common(filp->f_mapping->host, buf, len, *ppos,
UIO_USERSPACE, filp->f_flags, cr);
put_cred(cr);
if (read < 0)
return (read);
*ppos += read;
return (read);
}
ssize_t
zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
uio_seg_t segment, int flags, cred_t *cr)
{
int error;
struct iovec iov;
uio_t uio;
iov.iov_base = (void *)buf;
iov.iov_len = len;
uio.uio_iov = &iov;
uio.uio_resid = len,
uio.uio_iovcnt = 1;
uio.uio_loffset = pos;
uio.uio_limit = MAXOFFSET_T;
uio.uio_segflg = segment;
error = -zfs_write(ip, &uio, flags, cr);
if (error < 0)
return (error);
return (len - uio.uio_resid);
}
static ssize_t
zpl_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
{
cred_t *cr;
ssize_t wrote;
cr = (cred_t *)get_current_cred();
wrote = zpl_write_common(filp->f_mapping->host, buf, len, *ppos,
UIO_USERSPACE, filp->f_flags, cr);
put_cred(cr);
if (wrote < 0)
return (wrote);
*ppos += wrote;
return (wrote);
}
const struct address_space_operations zpl_address_space_operations = {
#if 0
.readpage = zpl_readpage,
.writepage = zpl_writepage,
.direct_IO = zpl_direct_IO,
#endif
};
const struct file_operations zpl_file_operations = {
.open = generic_file_open,
.llseek = generic_file_llseek,
.read = zpl_read, /* do_sync_read */
.write = zpl_write, /* do_sync_write */
.readdir = zpl_readdir,
.mmap = generic_file_mmap,
.fsync = zpl_fsync,
.aio_read = NULL, /* generic_file_aio_read */
.aio_write = NULL, /* generic_file_aio_write */
};
const struct file_operations zpl_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = zpl_readdir,
.fsync = zpl_fsync,
};