linux/fs/orangefs/inode.c
Colin Ian King e1b437691a orangefs: remove redundant pointer orangefs_inode
Pointer orangefs_inode is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'orangefs_inode' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
2018-08-14 12:07:14 -04:00

483 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
/*
* Linux VFS inode operations.
*/
#include <linux/bvec.h>
#include "protocol.h"
#include "orangefs-kernel.h"
#include "orangefs-bufmap.h"
static int read_one_page(struct page *page)
{
int ret;
int max_block;
ssize_t bytes_read = 0;
struct inode *inode = page->mapping->host;
const __u32 blocksize = PAGE_SIZE;
const __u32 blockbits = PAGE_SHIFT;
struct iov_iter to;
struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
iov_iter_bvec(&to, ITER_BVEC | READ, &bv, 1, PAGE_SIZE);
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_readpage called with page %p\n",
page);
max_block = ((inode->i_size / blocksize) + 1);
if (page->index < max_block) {
loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
bytes_read = orangefs_inode_read(inode,
&to,
&blockptr_offset,
inode->i_size);
}
/* this will only zero remaining unread portions of the page data */
iov_iter_zero(~0U, &to);
/* takes care of potential aliasing */
flush_dcache_page(page);
if (bytes_read < 0) {
ret = bytes_read;
SetPageError(page);
} else {
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
ret = 0;
}
/* unlock the page after the ->readpage() routine completes */
unlock_page(page);
return ret;
}
static int orangefs_readpage(struct file *file, struct page *page)
{
return read_one_page(page);
}
static int orangefs_readpages(struct file *file,
struct address_space *mapping,
struct list_head *pages,
unsigned nr_pages)
{
int page_idx;
int ret;
gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_readpages called\n");
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
struct page *page;
page = list_entry(pages->prev, struct page, lru);
list_del(&page->lru);
if (!add_to_page_cache(page,
mapping,
page->index,
readahead_gfp_mask(mapping))) {
ret = read_one_page(page);
gossip_debug(GOSSIP_INODE_DEBUG,
"failure adding page to cache, read_one_page returned: %d\n",
ret);
} else {
put_page(page);
}
}
BUG_ON(!list_empty(pages));
return 0;
}
static void orangefs_invalidatepage(struct page *page,
unsigned int offset,
unsigned int length)
{
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_invalidatepage called on page %p "
"(offset is %u)\n",
page,
offset);
ClearPageUptodate(page);
ClearPageMappedToDisk(page);
return;
}
static int orangefs_releasepage(struct page *page, gfp_t foo)
{
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_releasepage called on page %p\n",
page);
return 0;
}
/*
* Having a direct_IO entry point in the address_space_operations
* struct causes the kernel to allows us to use O_DIRECT on
* open. Nothing will ever call this thing, but in the future we
* will need to be able to use O_DIRECT on open in order to support
* AIO. Modeled after NFS, they do this too.
*/
static ssize_t orangefs_direct_IO(struct kiocb *iocb,
struct iov_iter *iter)
{
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_direct_IO: %pD\n",
iocb->ki_filp);
return -EINVAL;
}
/** ORANGEFS2 implementation of address space operations */
static const struct address_space_operations orangefs_address_operations = {
.readpage = orangefs_readpage,
.readpages = orangefs_readpages,
.invalidatepage = orangefs_invalidatepage,
.releasepage = orangefs_releasepage,
.direct_IO = orangefs_direct_IO,
};
static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
{
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
struct orangefs_kernel_op_s *new_op;
loff_t orig_size;
int ret = -EINVAL;
gossip_debug(GOSSIP_INODE_DEBUG,
"%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
__func__,
get_khandle_from_ino(inode),
&orangefs_inode->refn.khandle,
orangefs_inode->refn.fs_id,
iattr->ia_size);
/* Ensure that we have a up to date size, so we know if it changed. */
ret = orangefs_inode_getattr(inode, 0, 1, STATX_SIZE);
if (ret == -ESTALE)
ret = -EIO;
if (ret) {
gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
__func__, ret);
return ret;
}
orig_size = i_size_read(inode);
truncate_setsize(inode, iattr->ia_size);
new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
if (!new_op)
return -ENOMEM;
new_op->upcall.req.truncate.refn = orangefs_inode->refn;
new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
ret = service_operation(new_op,
__func__,
get_interruptible_flag(inode));
/*
* the truncate has no downcall members to retrieve, but
* the status value tells us if it went through ok or not
*/
gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
op_release(new_op);
if (ret != 0)
return ret;
if (orig_size != i_size_read(inode))
iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
return ret;
}
/*
* Change attributes of an object referenced by dentry.
*/
int orangefs_setattr(struct dentry *dentry, struct iattr *iattr)
{
int ret = -EINVAL;
struct inode *inode = dentry->d_inode;
gossip_debug(GOSSIP_INODE_DEBUG,
"%s: called on %pd\n",
__func__,
dentry);
ret = setattr_prepare(dentry, iattr);
if (ret)
goto out;
if (iattr->ia_valid & ATTR_SIZE) {
ret = orangefs_setattr_size(inode, iattr);
if (ret)
goto out;
}
setattr_copy(inode, iattr);
mark_inode_dirty(inode);
ret = orangefs_inode_setattr(inode, iattr);
gossip_debug(GOSSIP_INODE_DEBUG,
"%s: orangefs_inode_setattr returned %d\n",
__func__,
ret);
if (!ret && (iattr->ia_valid & ATTR_MODE))
/* change mod on a file that has ACLs */
ret = posix_acl_chmod(inode, inode->i_mode);
out:
gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
return ret;
}
/*
* Obtain attributes of an object given a dentry
*/
int orangefs_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags)
{
int ret = -ENOENT;
struct inode *inode = path->dentry->d_inode;
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_getattr: called on %pd\n",
path->dentry);
ret = orangefs_inode_getattr(inode, 0, 0, request_mask);
if (ret == 0) {
generic_fillattr(inode, stat);
/* override block size reported to stat */
if (request_mask & STATX_SIZE)
stat->result_mask = STATX_BASIC_STATS;
else
stat->result_mask = STATX_BASIC_STATS &
~STATX_SIZE;
stat->attributes_mask = STATX_ATTR_IMMUTABLE |
STATX_ATTR_APPEND;
if (inode->i_flags & S_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
if (inode->i_flags & S_APPEND)
stat->attributes |= STATX_ATTR_APPEND;
}
return ret;
}
int orangefs_permission(struct inode *inode, int mask)
{
int ret;
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
/* Make sure the permission (and other common attrs) are up to date. */
ret = orangefs_inode_getattr(inode, 0, 0, STATX_MODE);
if (ret < 0)
return ret;
return generic_permission(inode, mask);
}
int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
{
struct iattr iattr;
gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
get_khandle_from_ino(inode));
generic_update_time(inode, time, flags);
memset(&iattr, 0, sizeof iattr);
if (flags & S_ATIME)
iattr.ia_valid |= ATTR_ATIME;
if (flags & S_CTIME)
iattr.ia_valid |= ATTR_CTIME;
if (flags & S_MTIME)
iattr.ia_valid |= ATTR_MTIME;
return orangefs_inode_setattr(inode, &iattr);
}
/* ORANGEFS2 implementation of VFS inode operations for files */
static const struct inode_operations orangefs_file_inode_operations = {
.get_acl = orangefs_get_acl,
.set_acl = orangefs_set_acl,
.setattr = orangefs_setattr,
.getattr = orangefs_getattr,
.listxattr = orangefs_listxattr,
.permission = orangefs_permission,
.update_time = orangefs_update_time,
};
static int orangefs_init_iops(struct inode *inode)
{
inode->i_mapping->a_ops = &orangefs_address_operations;
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_op = &orangefs_file_inode_operations;
inode->i_fop = &orangefs_file_operations;
break;
case S_IFLNK:
inode->i_op = &orangefs_symlink_inode_operations;
break;
case S_IFDIR:
inode->i_op = &orangefs_dir_inode_operations;
inode->i_fop = &orangefs_dir_operations;
break;
default:
gossip_debug(GOSSIP_INODE_DEBUG,
"%s: unsupported mode\n",
__func__);
return -EINVAL;
}
return 0;
}
/*
* Given an ORANGEFS object identifier (fsid, handle), convert it into
* a ino_t type that will be used as a hash-index from where the handle will
* be searched for in the VFS hash table of inodes.
*/
static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
{
if (!ref)
return 0;
return orangefs_khandle_to_ino(&(ref->khandle));
}
/*
* Called to set up an inode from iget5_locked.
*/
static int orangefs_set_inode(struct inode *inode, void *data)
{
struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
ORANGEFS_I(inode)->refn.khandle = ref->khandle;
return 0;
}
/*
* Called to determine if handles match.
*/
static int orangefs_test_inode(struct inode *inode, void *data)
{
struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
struct orangefs_inode_s *orangefs_inode = NULL;
orangefs_inode = ORANGEFS_I(inode);
/* test handles and fs_ids... */
return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
&(ref->khandle)) &&
orangefs_inode->refn.fs_id == ref->fs_id);
}
/*
* Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
* file handle.
*
* @sb: the file system super block instance.
* @ref: The ORANGEFS object for which we are trying to locate an inode.
*/
struct inode *orangefs_iget(struct super_block *sb,
struct orangefs_object_kref *ref)
{
struct inode *inode = NULL;
unsigned long hash;
int error;
hash = orangefs_handle_hash(ref);
inode = iget5_locked(sb,
hash,
orangefs_test_inode,
orangefs_set_inode,
ref);
if (!inode || !(inode->i_state & I_NEW))
return inode;
error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
if (error) {
iget_failed(inode);
return ERR_PTR(error);
}
inode->i_ino = hash; /* needed for stat etc */
orangefs_init_iops(inode);
unlock_new_inode(inode);
gossip_debug(GOSSIP_INODE_DEBUG,
"iget handle %pU, fsid %d hash %ld i_ino %lu\n",
&ref->khandle,
ref->fs_id,
hash,
inode->i_ino);
return inode;
}
/*
* Allocate an inode for a newly created file and insert it into the inode hash.
*/
struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
int mode, dev_t dev, struct orangefs_object_kref *ref)
{
unsigned long hash = orangefs_handle_hash(ref);
struct inode *inode;
int error;
gossip_debug(GOSSIP_INODE_DEBUG,
"%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
__func__,
sb,
MAJOR(dev),
MINOR(dev),
mode);
inode = new_inode(sb);
if (!inode)
return NULL;
orangefs_set_inode(inode, ref);
inode->i_ino = hash; /* needed for stat etc */
error = orangefs_inode_getattr(inode, 1, 1, STATX_ALL);
if (error)
goto out_iput;
orangefs_init_iops(inode);
inode->i_mode = mode;
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
inode->i_size = PAGE_SIZE;
inode->i_rdev = dev;
error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
if (error < 0)
goto out_iput;
gossip_debug(GOSSIP_INODE_DEBUG,
"Initializing ACL's for inode %pU\n",
get_khandle_from_ino(inode));
orangefs_init_acl(inode, dir);
return inode;
out_iput:
iput(inode);
return ERR_PTR(error);
}