/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
/*
* fs/xfs/linux/xfs_iops.c
* This file would be called xfs_inode.c, but that is already taken
* in the standard XFS code.
*
*/
#include <xfs.h>
#include <linux/mm.h>
#include <linux/locks.h>
#include <linux/xfs_iops.h>
#include <linux/xfs_file.h>
#include <linux/attributes.h>
/*
* Pull the link count and size up from the xfs inode to the linux inode
*/
static void validate_fields(struct inode *ip)
{
vnode_t *vp = LINVFS_GET_VP(ip);
vattr_t va;
int error;
va.va_mask = AT_NLINK|AT_SIZE;
VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
ip->i_nlink = va.va_nlink;
ip->i_size = va.va_size;
}
/*
* Common code used to create/instantiate various things in a directory.
*/
int linvfs_common_cr(struct inode *dir, struct dentry *dentry, int mode,
enum vtype tp, int rdev)
{
int error = 0;
vnode_t *dvp, *vp;
struct inode *ip;
vattr_t va;
dvp = LINVFS_GET_VP(dir);
ASSERT(dvp);
vp = NULL;
bzero(&va, sizeof(va));
va.va_mask = AT_TYPE|AT_MODE;
va.va_type = tp;
va.va_mode = mode; /* Do we need to pass this through? JIMJIM
va.va_mode = 0777 & ~current->fs->umask; */
va.va_size = 0;
if (tp == VREG) {
VOP_CREATE(dvp, (char *)dentry->d_name.name, &va, 0, 0, &vp,
NULL, error);
} else if (ISVDEV(tp)) {
/*
* Get the real type from the mode
*/
va.va_rdev = rdev;
va.va_mask |= AT_RDEV;
va.va_type = IFTOVT(mode);
if (va.va_type == VNON) {
return -EINVAL;
}
VOP_CREATE(dvp, (char *)dentry->d_name.name, &va, 0, 0, &vp,
NULL, error);
} else if (tp == VDIR) {
VOP_MKDIR(dvp, (char *)dentry->d_name.name, &va, &vp,
NULL, error);
} else {
error = EINVAL;
}
if (!error) {
ASSERT(vp);
ip = LINVFS_GET_IP(vp);
if (!ip) {
VN_RELE(vp);
return -ENOMEM;
}
linvfs_set_inode_ops(ip);
error = linvfs_revalidate_core(ip);
validate_fields(dir);
d_instantiate(dentry, ip);
}
return -error;
}
/*
* Create a new file in dir using mode.
*/
int linvfs_create(struct inode *dir, struct dentry *dentry, int mode)
{
return(linvfs_common_cr(dir, dentry, mode, VREG, 0));
}
struct dentry * linvfs_lookup(struct inode *dir, struct dentry *dentry)
{
int error;
vnode_t *vp, *cvp;
pathname_t pn;
pathname_t *pnp = &pn;
struct inode *ip = NULL;
vp = LINVFS_GET_VP(dir);
ASSERT(vp);
/*
* Initialize a pathname_t to pass down.
*/
bzero(pnp, sizeof(pathname_t));
pnp->pn_complen = dentry->d_name.len;
pnp->pn_hash = dentry->d_name.hash;
pnp->pn_path = (char *)dentry->d_name.name;
cvp = NULL;
VOP_LOOKUP(vp, (char *)dentry->d_name.name, &cvp, pnp, 0, NULL,
NULL, error);
if (!error) {
ASSERT(cvp);
ip = LINVFS_GET_IP(cvp);
if (!ip) {
VN_RELE(cvp);
return ERR_PTR(-EACCES);
}
linvfs_set_inode_ops(ip);
error = linvfs_revalidate_core(ip);
}
d_add(dentry, ip); /* Negative entry goes in if ip is NULL */
return NULL;
}
int linvfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
int error;
vnode_t *tdvp; /* Target directory for new name/link */
vnode_t *vp; /* vp of name being linked */
struct inode *ip; /* inode of guy being linked to */
ip = old_dentry->d_inode; /* inode being linked to */
if (S_ISDIR(ip->i_mode))
return -EPERM;
tdvp = LINVFS_GET_VP(dir);
ASSERT(tdvp);
vp = LINVFS_GET_VP(ip);
ASSERT(vp);
error = 0;
VOP_LINK(tdvp, vp, (char *)dentry->d_name.name, NULL, error);
if (!error) {
ip->i_ctime = CURRENT_TIME;
VN_HOLD(vp);
validate_fields(ip);
d_instantiate(dentry, ip);
}
return -error;
}
int linvfs_unlink(struct inode *dir, struct dentry *dentry)
{
int error;
struct inode *inode;
vnode_t *dvp; /* directory containing name to remove */
vnode_t *vp;
inode = dentry->d_inode;
vp = LINVFS_GET_VP(inode);
dvp = LINVFS_GET_VP(dir);
ASSERT(dvp);
error = 0;
VOP_REMOVE(dvp, vp, (char *)dentry->d_name.name, NULL, error);
if (!error) {
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
dir->i_version = ++event;
inode->i_ctime = dir->i_ctime;
validate_fields(dir); /* For size only */
validate_fields(inode);
}
return -error;
}
int linvfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
int error;
vnode_t *dvp; /* directory containing name to remove */
vnode_t *cvp; /* used to lookup symlink to put in dentry */
vattr_t va;
struct inode *ip = NULL;
dvp = LINVFS_GET_VP(dir);
ASSERT(dvp);
bzero(&va, sizeof(va));
va.va_type = VLNK;
va.va_mode = 0777 & ~current->fs->umask;
va.va_mask = AT_TYPE|AT_MODE; /* AT_PROJID? */
error = 0;
VOP_SYMLINK(dvp, (char *)dentry->d_name.name, &va, (char *)symname,
&cvp, NULL, error);
if (!error) {
ASSERT(cvp);
ASSERT(cvp->v_type == VLNK);
ip = LINVFS_GET_IP(cvp);
if (!ip) {
error = -ENOMEM;
VN_RELE(cvp);
} else {
linvfs_set_inode_ops(ip);
error = linvfs_revalidate_core(ip);
d_instantiate(dentry, ip);
}
}
return -error;
}
int linvfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
return(linvfs_common_cr(dir, dentry, mode, VDIR, 0));
}
int linvfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int error;
vnode_t *dvp, /* directory with name to remove */
*pwd_vp; /* current working directory, vnode */
vnode_t *vp;
struct inode *inode = dentry->d_inode;
vp = LINVFS_GET_VP(inode);
dvp = LINVFS_GET_VP(dir);
ASSERT(dvp);
pwd_vp = NULL; /* Used for an unnecessary test */
/*
* Someday we could pass the dentry->d_inode into VOP_REMOVE so
* that it can skip the lookup.
*/
error = 0;
VOP_RMDIR(dvp, vp, (char *)dentry->d_name.name, pwd_vp, NULL, error);
if (!error) {
validate_fields(inode);
validate_fields(dir);
inode->i_version = ++event;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
}
return -error;
}
int linvfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
{
int error = 0;
enum vtype tp;
if (S_ISCHR(mode)) {
tp = VCHR;
} else if (S_ISBLK(mode)) {
tp = VBLK;
} else if (S_ISFIFO(mode)) {
tp = VFIFO;
} else if (S_ISSOCK(mode)) {
tp = VSOCK;
} else {
error = -EINVAL;
}
if (!error) {
error = linvfs_common_cr(dir, dentry, mode, tp, rdev);
}
return(error);
}
int linvfs_rename(struct inode *odir, struct dentry *odentry,
struct inode *ndir, struct dentry *ndentry)
{
int error;
vnode_t *fvp; /* from directory */
vnode_t *tvp; /* target directory */
pathname_t pn;
pathname_t *pnp = &pn;
struct inode *new_inode = NULL;
bzero(pnp, sizeof(pathname_t));
pnp->pn_complen = ndentry->d_name.len;
pnp->pn_hash = ndentry->d_name.hash;
pnp->pn_path = (char *)ndentry->d_name.name;
fvp = LINVFS_GET_VP(odir);
ASSERT(fvp);
tvp = LINVFS_GET_VP(ndir);
ASSERT(tvp);
new_inode = ndentry->d_inode;
VOP_RENAME(fvp, (char *)odentry->d_name.name, tvp,
(char *)ndentry->d_name.name, pnp, NULL, error);
if (error)
return -error;
ndir->i_version = ++event;
odir->i_version = ++event;
if (new_inode) {
new_inode->i_ctime = CURRENT_TIME;
validate_fields(new_inode);
}
odir->i_ctime = odir->i_mtime = CURRENT_TIME;
validate_fields(odir);
if (ndir != odir)
validate_fields(ndir);
return 0;
}
int linvfs_readlink(struct dentry *dentry, char *buf, int size)
{
vnode_t *vp;
uio_t uio;
iovec_t iov;
int error = 0;
vp = LINVFS_GET_VP(dentry->d_inode);
ASSERT(vp);
iov.iov_base = buf;
iov.iov_len = size;
uio.uio_iov = &iov;
uio.uio_offset = 0;
uio.uio_segflg = UIO_USERSPACE;
uio.uio_resid = size;
VOP_READLINK(vp, &uio, NULL, error);
if (error)
return -error;
return (size - uio.uio_resid);
}
/*
* careful here - this function can get called recusively up
* to 32 times, hence we need to be very careful about how much
* stack we use. uio is kmalloced for this reason...
*/
int linvfs_follow_link(struct dentry *dentry,
struct nameidata *nd)
{
vnode_t *vp;
uio_t *uio;
iovec_t iov;
int error = 0;
char *link;
ASSERT(dentry);
ASSERT(nd);
link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
if (!link) return -ENOMEM;
uio = (uio_t*)kmalloc(sizeof(uio_t), GFP_KERNEL);
if (!uio) {
kfree(link);
return -ENOMEM;
}
vp = LINVFS_GET_VP(dentry->d_inode);
ASSERT(vp);
iov.iov_base = link;
iov.iov_len = MAXNAMELEN;
uio->uio_iov = &iov;
uio->uio_offset = 0;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_resid = MAXNAMELEN;
VOP_READLINK(vp, uio, NULL, error);
if (error) {
kfree(uio);
kfree(link);
return error;
}
link[MAXNAMELEN - uio->uio_resid] = '\0';
kfree(uio);
error = vfs_follow_link(nd, link);
kfree(link);
return error;
}
/*
* Implement attrctl(2) functions.
* Returns -ve on error (ie -ENOMEM).
* Updates ops[?].error fields with a +ve errno (ie +ENOMEM).
*/
int linvfs_attrctl(
struct inode *inode,
attr_op_t *ops,
int count)
{
int i;
int error = 0;
vnode_t *vp;
for (i = 0; i < count; i++) {
int flags = ops[i].flags;
/* common flags */
flags &= ~(ATTR_ROOT | ATTR_DONTFOLLOW);
/* command specific */
if (ops[i].opcode == ATTR_OP_SET)
flags &= ~(ATTR_CREATE | ATTR_REPLACE);
if (flags != 0x0)
return -EINVAL;
/* permissions */
if ((ops[i].flags & ATTR_ROOT) && ! capable(CAP_SYS_ADMIN))
return -EPERM;
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
switch (ops[i].opcode) {
case ATTR_OP_GET:
VOP_ATTR_GET(vp,
ops[i].name,
ops[i].value,
&ops[i].length,
ops[i].flags,
(struct cred *) NULL,
ops[i].error); /* +ve return val */
break;
case ATTR_OP_SET:
VOP_ATTR_SET(vp,
ops[i].name,
ops[i].value,
ops[i].length,
ops[i].flags,
(struct cred *) NULL,
ops[i].error);
break;
case ATTR_OP_REMOVE:
VOP_ATTR_REMOVE(vp,
ops[i].name,
ops[i].flags,
(struct cred *) NULL,
ops[i].error);
break;
case ATTR_OP_IRIX_LIST:
VOP_ATTR_LIST(vp,
ops[i].value,
ops[i].length,
ops[i].flags,
ops[i].aux,
(struct cred *) NULL,
ops[i].error);
break;
case ATTR_OP_LIST:
default:
error = ENOSYS;
}
}
return -error;
}
int linvfs_permission(struct inode *ip, int mode)
{
vnode_t *vp;
int error;
mode <<= 6; /* convert from linux to vnode access bits */
vp = LINVFS_GET_VP(ip);
ASSERT(vp);
VOP_ACCESS(vp, mode, NULL, error);
return -error;
}
/* Brute force approach for now - copy data into linux inode
* from the results of a getattr. This gets called out of things
* like stat.
*/
int linvfs_revalidate_core(struct inode *inode)
{
vnode_t *vp;
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
return vn_revalidate(vp, 0);
}
int linvfs_revalidate(struct dentry *dentry)
{
return linvfs_revalidate_core(dentry->d_inode);
}
int
linvfs_notify_change(
struct dentry *dentry,
struct iattr *attr)
{
vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
vattr_t vattr;
unsigned int ia_valid = attr->ia_valid;
int error;
struct inode *inode;
ASSERT(vp);
inode = dentry->d_inode;
error = inode_change_ok(inode, attr);
if (error){
return(error);
}
memset(&vattr, 0, sizeof(vattr_t));
if (ia_valid & ATTR_UID) {
vattr.va_mask |= AT_UID;
vattr.va_uid = attr->ia_uid;
}
if (ia_valid & ATTR_GID) {
vattr.va_mask |= AT_GID;
vattr.va_gid = attr->ia_gid;
}
if (ia_valid & ATTR_SIZE) {
vattr.va_mask |= AT_SIZE;
vattr.va_size = attr->ia_size;
}
if (ia_valid & ATTR_ATIME) {
vattr.va_mask |= AT_ATIME;
vattr.va_atime.tv_sec = attr->ia_atime;
vattr.va_atime.tv_nsec = 0;
}
if (ia_valid & ATTR_MTIME) {
vattr.va_mask |= AT_MTIME;
vattr.va_mtime.tv_sec = attr->ia_mtime;
vattr.va_mtime.tv_nsec = 0;
}
if (ia_valid & ATTR_CTIME) {
vattr.va_mask |= AT_CTIME;
vattr.va_ctime.tv_sec = attr->ia_ctime;
vattr.va_ctime.tv_nsec = 0;
}
if (ia_valid & ATTR_MODE) {
vattr.va_mask |= AT_MODE;
vattr.va_mode = attr->ia_mode;
if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
inode->i_mode &= ~S_ISGID;
}
VOP_SETATTR(vp, &vattr, 0, sys_cred, error);
if (!error) {
inode_setattr(inode, attr);
}
return(-error);
}
int
linvfs_pb_bmap(struct inode *inode,
loff_t offset,
ssize_t count,
struct page_buf_bmap_s *pbmapp,
int maxpbbm,
int *retpbbm,
int flags/* page_buf_flags_t */)
{
vnode_t *vp;
int error;
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
*retpbbm = maxpbbm;
VOP_BMAP(vp, offset, count, flags,
(struct page_buf_bmap_s *) pbmapp, retpbbm, error);
return -error;
}
int
linvfs_read_full_page(
struct file *filp,
mem_map_t *page)
{
vnode_t *vp;
struct inode *inode = (struct inode*)page->mapping->host;
int error;
if (!PageLocked(page))
BUG();
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
VN_BHV_READ_LOCK(&(vp)->v_bh);
if (!VOP_RWLOCK_TRY(vp, VRWLOCK_TRY_READ)) {
VN_BHV_READ_UNLOCK(&(vp)->v_bh);
UnlockPage(page);
VOP_RWLOCK(vp, VRWLOCK_READ);
lock_page(page); /* We can wait for the page with inode I/O lock */
if (Page_Uptodate(page)) {
UnlockPage(page);
VOP_RWUNLOCK(vp, VRWLOCK_READ);
return 0;
}
}
error = pagebuf_read_full_page(filp, page);
VOP_RWUNLOCK(vp, VRWLOCK_READ);
return error;
}
STATIC int
linvfs_write_full_page(
struct file *filp,
struct page *page,
int wait)
{
vnode_t *vp;
struct inode *inode = (struct inode*)page->mapping->host;
int error;
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
VN_BHV_READ_LOCK(&(vp)->v_bh);
if (!VOP_RWLOCK_TRY(vp, VRWLOCK_TRY_WRITE)) {
VN_BHV_READ_UNLOCK(&(vp)->v_bh);
if (!wait)
return -EBUSY;
ASSERT(atomic_read(&page->count));
UnlockPage(page);
VOP_RWLOCK(vp, VRWLOCK_WRITE);
lock_page(page); /* Wait for the page with inode I/O lock */
}
error = pagebuf_write_full_page(filp, page);
VOP_RWUNLOCK(vp, VRWLOCK_WRITE);
return error;
}
int
linvfs_write_full_page_sync(
struct file *filp,
struct page *page)
{
return(linvfs_write_full_page(filp, page, 1));
}
int
linvfs_write_full_page_async(
struct file *filp,
struct page *page)
{
return(linvfs_write_full_page(filp, page, 0));
}
void linvfs_file_read(
struct file *filp,
void * desc)
{
struct inode *inode = filp->f_dentry->d_inode;
vnode_t *vp;
vp = LINVFS_GET_VP(inode);
ASSERT(vp);
VOP_RWLOCK(vp, VRWLOCK_READ);
pagebuf_file_read(filp, desc);
VOP_RWUNLOCK(vp, VRWLOCK_READ);
return;
}
STATIC
int linvfs_bmap(struct address_space *mapping, long block)
{
struct inode *inode = (struct inode *)mapping->host;
vnode_t *vp = LINVFS_GET_VP(inode);
pb_bmap_t bmap = {0};
int nbm = 1;
int error;
/* block - linux disk blocks 512b */
/* bmap input offset - bytes 1b */
/* bmap outut bn - xfs BBs 512b */
/* bmap outut delta - bytes 1b */
ASSERT(vp);
vn_trace_entry(vp, "linvfs_bmap", (inst_t *)__return_address);
if (inode->i_data.nrpages) {
VOP_RWLOCK(vp, VRWLOCK_READ);
VOP_FLUSH_PAGES(vp, (xfs_off_t)0, 0, FI_REMAPF, error);
VOP_RWUNLOCK(vp, VRWLOCK_READ);
}
if (error)
return -1;
VOP_BMAP(vp, block << 9, 1, PBF_READ|PBF_BMAP_TRY_ILOCK,
&bmap, &nbm, error);
if (error)
return -1;
/*
printk("%Ld -> (%Ld,%Ld) %Ld\n",
(long long)block,
(long long)bmap.pbm_bn, (long long)(bmap.pbm_delta >> 9),
(long long)(bmap.pbm_bn + (bmap.pbm_delta >> 9)));
*/
return (int)(bmap.pbm_bn + (bmap.pbm_delta >> 9));
}
struct address_space_operations linvfs_aops = {
readpage: linvfs_read_full_page,
writepage: linvfs_write_full_page_sync,
sync_page: block_sync_page,
bmap: linvfs_bmap,
convertpage: pagebuf_convert_page,
writepage_async: linvfs_write_full_page_async,
prepare_write: pagebuf_prepare_write,
commit_write: pagebuf_commit_write,
};
struct inode_operations linvfs_file_inode_operations =
{
permission: linvfs_permission,
revalidate: linvfs_revalidate,
setattr: linvfs_notify_change,
pagebuf_bmap: linvfs_pb_bmap,
pagebuf_fileread: linvfs_file_read,
attrctl: linvfs_attrctl,
};
struct inode_operations linvfs_dir_inode_operations =
{
create: linvfs_create,
lookup: linvfs_lookup,
link: linvfs_link,
unlink: linvfs_unlink,
symlink: linvfs_symlink,
mkdir: linvfs_mkdir,
rmdir: linvfs_rmdir,
mknod: linvfs_mknod,
rename: linvfs_rename,
permission: linvfs_permission,
revalidate: linvfs_revalidate,
setattr: linvfs_notify_change,
attrctl: linvfs_attrctl,
};
struct inode_operations linvfs_symlink_inode_operations =
{
readlink: linvfs_readlink,
follow_link: linvfs_follow_link,
permission: linvfs_permission,
revalidate: linvfs_revalidate,
setattr: linvfs_notify_change,
attrctl: linvfs_attrctl,
};
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