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|
/*
* (C) 2001 Clemson University and The University of Chicago
*
* See COPYING in top-level directory.
*/
/*
* Linux VFS inode operations.
*/
#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; /* inode->i_blksize */
const __u32 blockbits = PAGE_SHIFT; /* inode->i_blkbits */
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;
}
struct backing_dev_info orangefs_backing_dev_info = {
.name = "orangefs",
.ra_pages = 0,
.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
};
/** ORANGEFS2 implementation of address space operations */
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);
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,
"orangefs: orangefs_truncate got return value of %d\n",
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,
"orangefs_setattr: called on %pd\n",
dentry);
ret = setattr_prepare(dentry, iattr);
if (ret)
goto out;
if ((iattr->ia_valid & ATTR_SIZE) &&
iattr->ia_size != i_size_read(inode)) {
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,
"orangefs_setattr: inode_setattr returned %d\n",
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, "orangefs_setattr: returning %d\n", ret);
return ret;
}
/*
* Obtain attributes of an object given a dentry
*/
int orangefs_getattr(struct vfsmount *mnt,
struct dentry *dentry,
struct kstat *kstat)
{
int ret = -ENOENT;
struct inode *inode = dentry->d_inode;
struct orangefs_inode_s *orangefs_inode = NULL;
gossip_debug(GOSSIP_INODE_DEBUG,
"orangefs_getattr: called on %pd\n",
dentry);
ret = orangefs_inode_getattr(inode, 0, 0);
if (ret == 0) {
generic_fillattr(inode, kstat);
/* override block size reported to stat */
orangefs_inode = ORANGEFS_I(inode);
kstat->blksize = orangefs_inode->blksize;
}
return ret;
}
int orangefs_permission(struct inode *inode, int
|