[deliverable/linux.git] / fs / orangefs / inode.c

/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

/*
 *  Linux VFS inode operations.
 */

#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-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_CACHE_SIZE;	/* inode->i_blksize */
	const __u32 blockbits = PAGE_CACHE_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,
		    "pvfs2_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 = pvfs2_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 pvfs2_readpage(struct file *file, struct page *page)
{
	return read_one_page(page);
}

static int pvfs2_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, "pvfs2_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,
				       GFP_KERNEL)) {
			ret = read_one_page(page);
			gossip_debug(GOSSIP_INODE_DEBUG,
				"failure adding page to cache, read_one_page returned: %d\n",
				ret);
	      } else {
			page_cache_release(page);
	      }
	}
	BUG_ON(!list_empty(pages));
	return 0;
}

static void pvfs2_invalidatepage(struct page *page,
				 unsigned int offset,
				 unsigned int length)
{
	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_invalidatepage called on page %p "
		     "(offset is %u)\n",
		     page,
		     offset);

	ClearPageUptodate(page);
	ClearPageMappedToDisk(page);
	return;

}

static int pvfs2_releasepage(struct page *page, gfp_t foo)
{
	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_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 pvfs2_direct_IO(int rw,
 *			struct kiocb *iocb,
 *			struct iov_iter *iter,
 *			loff_t offset)
 *{
 *	gossip_debug(GOSSIP_INODE_DEBUG,
 *		     "pvfs2_direct_IO: %s\n",
 *		     iocb->ki_filp->f_path.dentry->d_name.name);
 *
 *	return -EINVAL;
 *}
 */

struct backing_dev_info pvfs2_backing_dev_info = {
	.name = "pvfs2",
	.ra_pages = 0,
	.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
};

/** PVFS2 implementation of address space operations */
const struct address_space_operations pvfs2_address_operations = {
	.readpage = pvfs2_readpage,
	.readpages = pvfs2_readpages,
	.invalidatepage = pvfs2_invalidatepage,
	.releasepage = pvfs2_releasepage,
/*	.direct_IO = pvfs2_direct_IO */
};

static int pvfs2_setattr_size(struct inode *inode, struct iattr *iattr)
{
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
	struct pvfs2_kernel_op_s *new_op;
	loff_t orig_size = i_size_read(inode);
	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),
		     &pvfs2_inode->refn.khandle,
		     pvfs2_inode->refn.fs_id,
		     iattr->ia_size);

	truncate_setsize(inode, iattr->ia_size);

	new_op = op_alloc(PVFS2_VFS_OP_TRUNCATE);
	if (!new_op)
		return -ENOMEM;

	new_op->upcall.req.truncate.refn = pvfs2_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,
		     "pvfs2: pvfs2_truncate got return value of %d\n",
		     ret);

	op_release(new_op);

	if (ret != 0)
		return ret;

	/*
	 * Only change the c/mtime if we are changing the size or we are
	 * explicitly asked to change it.  This handles the semantic difference
	 * between truncate() and ftruncate() as implemented in the VFS.
	 *
	 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
	 * special case where we need to update the times despite not having
	 * these flags set.  For all other operations the VFS set these flags
	 * explicitly if it wants a timestamp update.
	 */
	if (orig_size != i_size_read(inode) &&
	    !(iattr->ia_valid & (ATTR_CTIME | ATTR_MTIME))) {
		iattr->ia_ctime = iattr->ia_mtime =
			current_fs_time(inode->i_sb);
		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
	}

	return ret;
}

/*
 * Change attributes of an object referenced by dentry.
 */
int pvfs2_setattr(struct dentry *dentry, struct iattr *iattr)
{
	int ret = -EINVAL;
	struct inode *inode = dentry->d_inode;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_setattr: called on %s\n",
		     dentry->d_name.name);

	ret = inode_change_ok(inode, iattr);
	if (ret)
		goto out;

	if ((iattr->ia_valid & ATTR_SIZE) &&
	    iattr->ia_size != i_size_read(inode)) {
		ret = pvfs2_setattr_size(inode, iattr);
		if (ret)
			goto out;
	}

	setattr_copy(inode, iattr);
	mark_inode_dirty(inode);

	ret = pvfs2_inode_setattr(inode, iattr);
	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_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, "pvfs2_setattr: returning %d\n", ret);
	return ret;
}

/*
 * Obtain attributes of an object given a dentry
 */
int pvfs2_getattr(struct vfsmount *mnt,
		  struct dentry *dentry,
		  struct kstat *kstat)
{
	int ret = -ENOENT;
	struct inode *inode = dentry->d_inode;
	struct pvfs2_inode_s *pvfs2_inode = NULL;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_getattr: called on %s\n",
		     dentry->d_name.name);

	/*
	 * Similar to the above comment, a getattr also expects that all
	 * fields/attributes of the inode would be refreshed. So again, we
	 * dont have too much of a choice but refresh all the attributes.
	 */
	ret = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
	if (ret == 0) {
		generic_fillattr(inode, kstat);
		/* override block size reported to stat */
		pvfs2_inode = PVFS2_I(inode);
		kstat->blksize = pvfs2_inode->blksize;
	} else {
		/* assume an I/O error and flag inode as bad */
		gossip_debug(GOSSIP_INODE_DEBUG,
			     "%s:%s:%d calling make bad inode\n",
			     __FILE__,
			     __func__,
			     __LINE__);
		pvfs2_make_bad_inode(inode);
	}
	return ret;
}

/* PVFS2 implementation of VFS inode operations for files */
struct inode_operations pvfs2_file_inode_operations = {
	.get_acl = pvfs2_get_acl,
	.set_acl = pvfs2_set_acl,
	.setattr = pvfs2_setattr,
	.getattr = pvfs2_getattr,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.listxattr = pvfs2_listxattr,
	.removexattr = generic_removexattr,
};

static int pvfs2_init_iops(struct inode *inode)
{
	inode->i_mapping->a_ops = &pvfs2_address_operations;

	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
		inode->i_op = &pvfs2_file_inode_operations;
		inode->i_fop = &pvfs2_file_operations;
		inode->i_blkbits = PAGE_CACHE_SHIFT;
		break;
	case S_IFLNK:
		inode->i_op = &pvfs2_symlink_inode_operations;
		break;
	case S_IFDIR:
		inode->i_op = &pvfs2_dir_inode_operations;
		inode->i_fop = &pvfs2_dir_operations;
		break;
	default:
		gossip_debug(GOSSIP_INODE_DEBUG,
			     "%s: unsupported mode\n",
			     __func__);
		return -EINVAL;
	}

	return 0;
}

/*
 * Given a PVFS2 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 pvfs2_handle_hash(struct pvfs2_object_kref *ref)
{
	if (!ref)
		return 0;
	return pvfs2_khandle_to_ino(&(ref->khandle));
}

/*
 * Called to set up an inode from iget5_locked.
 */
static int pvfs2_set_inode(struct inode *inode, void *data)
{
	struct pvfs2_object_kref *ref = (struct pvfs2_object_kref *) data;
	struct pvfs2_inode_s *pvfs2_inode = NULL;

	/* Make sure that we have sane parameters */
	if (!data || !inode)
		return 0;
	pvfs2_inode = PVFS2_I(inode);
	if (!pvfs2_inode)
		return 0;
	pvfs2_inode->refn.fs_id = ref->fs_id;
	pvfs2_inode->refn.khandle = ref->khandle;
	return 0;
}

/*
 * Called to determine if handles match.
 */
static int pvfs2_test_inode(struct inode *inode, void *data)
{
	struct pvfs2_object_kref *ref = (struct pvfs2_object_kref *) data;
	struct pvfs2_inode_s *pvfs2_inode = NULL;

	pvfs2_inode = PVFS2_I(inode);
	return (!PVFS_khandle_cmp(&(pvfs2_inode->refn.khandle), &(ref->khandle))
		&& pvfs2_inode->refn.fs_id == ref->fs_id);
}

/*
 * Front-end to lookup the inode-cache maintained by the VFS using the PVFS2
 * file handle.
 *
 * @sb: the file system super block instance.
 * @ref: The PVFS2 object for which we are trying to locate an inode structure.
 */
struct inode *pvfs2_iget(struct super_block *sb, struct pvfs2_object_kref *ref)
{
	struct inode *inode = NULL;
	unsigned long hash;
	int error;

	hash = pvfs2_handle_hash(ref);
	inode = iget5_locked(sb, hash, pvfs2_test_inode, pvfs2_set_inode, ref);
	if (!inode || !(inode->i_state & I_NEW))
		return inode;

	error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
	if (error) {
		iget_failed(inode);
		return ERR_PTR(error);
	}

	inode->i_ino = hash;	/* needed for stat etc */
	pvfs2_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 *pvfs2_new_inode(struct super_block *sb, struct inode *dir,
		int mode, dev_t dev, struct pvfs2_object_kref *ref)
{
	unsigned long hash = pvfs2_handle_hash(ref);
	struct inode *inode;
	int error;

	gossip_debug(GOSSIP_INODE_DEBUG,
		     "pvfs2_get_custom_inode_common: called\n"
		     "(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
		     sb,
		     MAJOR(dev),
		     MINOR(dev),
		     mode);

	inode = new_inode(sb);
	if (!inode)
		return NULL;

	pvfs2_set_inode(inode, ref);
	inode->i_ino = hash;	/* needed for stat etc */

	error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
	if (error)
		goto out_iput;

	pvfs2_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->i_size = PAGE_CACHE_SIZE;
	inode->i_rdev = dev;

	error = insert_inode_locked4(inode, hash, pvfs2_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));
	pvfs2_init_acl(inode, dir);
	return inode;

out_iput:
	iput(inode);
	return ERR_PTR(error);
}
Commit	Line	Data
5db11c21 MM	1	/*
	2	* (C) 2001 Clemson University and The University of Chicago
	3	*
	4	* See COPYING in top-level directory.
	5	*/
	6
	7	/*
	8	* Linux VFS inode operations.
	9	*/
	10
	11	#include "protocol.h"
	12	#include "pvfs2-kernel.h"
	13	#include "pvfs2-bufmap.h"
	14
	15	static int read_one_page(struct page *page)
	16	{
5db11c21 MM	17	int ret;
	18	int max_block;
	19	ssize_t bytes_read = 0;
	20	struct inode *inode = page->mapping->host;
	21	const __u32 blocksize = PAGE_CACHE_SIZE; /* inode->i_blksize */
	22	const __u32 blockbits = PAGE_CACHE_SHIFT; /* inode->i_blkbits */
74f68fce AV	23	struct iov_iter to;
	24	struct bio_vec bv = {.bv_page = page, .bv_len = PAGE_SIZE};
	25
	26	iov_iter_bvec(&to, ITER_BVEC \| READ, &bv, 1, PAGE_SIZE);
5db11c21 MM	27
	28	gossip_debug(GOSSIP_INODE_DEBUG,
	29	"pvfs2_readpage called with page %p\n",
	30	page);
5db11c21 MM	31
	32	max_block = ((inode->i_size / blocksize) + 1);
	33
	34	if (page->index < max_block) {
	35	loff_t blockptr_offset = (((loff_t) page->index) << blockbits);
	36
	37	bytes_read = pvfs2_inode_read(inode,
74f68fce	38	&to,
5db11c21 MM	39	&blockptr_offset,
	40	inode->i_size);
	41	}
74f68fce AV	42	/* this will only zero remaining unread portions of the page data */
74f68fce AV	43	iov_iter_zero(~0U, &to);
5db11c21 MM	44	/* takes care of potential aliasing */
	45	flush_dcache_page(page);
	46	if (bytes_read < 0) {
	47	ret = bytes_read;
	48	SetPageError(page);
	49	} else {
	50	SetPageUptodate(page);
	51	if (PageError(page))
	52	ClearPageError(page);
	53	ret = 0;
	54	}
5db11c21 MM	55	/* unlock the page after the ->readpage() routine completes */
	56	unlock_page(page);
	57	return ret;
	58	}
	59
	60	static int pvfs2_readpage(struct file file, struct page page)
	61	{
	62	return read_one_page(page);
	63	}
	64
	65	static int pvfs2_readpages(struct file *file,
	66	struct address_space *mapping,
	67	struct list_head *pages,
	68	unsigned nr_pages)
	69	{
	70	int page_idx;
	71	int ret;
	72
	73	gossip_debug(GOSSIP_INODE_DEBUG, "pvfs2_readpages called\n");
	74
	75	for (page_idx = 0; page_idx < nr_pages; page_idx++) {
	76	struct page *page;
	77
	78	page = list_entry(pages->prev, struct page, lru);
	79	list_del(&page->lru);
	80	if (!add_to_page_cache(page,
	81	mapping,
	82	page->index,
	83	GFP_KERNEL)) {
	84	ret = read_one_page(page);
	85	gossip_debug(GOSSIP_INODE_DEBUG,
	86	"failure adding page to cache, read_one_page returned: %d\n",
	87	ret);
	88	} else {
	89	page_cache_release(page);
	90	}
	91	}
	92	BUG_ON(!list_empty(pages));
	93	return 0;
	94	}
	95
	96	static void pvfs2_invalidatepage(struct page *page,
	97	unsigned int offset,
	98	unsigned int length)
	99	{
	100	gossip_debug(GOSSIP_INODE_DEBUG,
	101	"pvfs2_invalidatepage called on page %p "
	102	"(offset is %u)\n",
	103	page,
	104	offset);
	105
	106	ClearPageUptodate(page);
	107	ClearPageMappedToDisk(page);
	108	return;
	109
	110	}
	111
	112	static int pvfs2_releasepage(struct page *page, gfp_t foo)
	113	{
	114	gossip_debug(GOSSIP_INODE_DEBUG,
	115	"pvfs2_releasepage called on page %p\n",
	116	page);
	117	return 0;
	118	}
119
120	/*
121	* Having a direct_IO entry point in the address_space_operations
122	* struct causes the kernel to allows us to use O_DIRECT on
123	* open. Nothing will ever call this thing, but in the future we
124	* will need to be able to use O_DIRECT on open in order to support
125	* AIO. Modeled after NFS, they do this too.
126	*/
127	/*
54804949 MM	128	* static ssize_t pvfs2_direct_IO(int rw,
	129	* struct kiocb *iocb,
	130	* struct iov_iter *iter,
	131	* loff_t offset)
	132	*{
	133	* gossip_debug(GOSSIP_INODE_DEBUG,
	134	* "pvfs2_direct_IO: %s\n",
	135	* iocb->ki_filp->f_path.dentry->d_name.name);
	136	*
	137	* return -EINVAL;
	138	*}
	139	*/
5db11c21 MM	140
	141	struct backing_dev_info pvfs2_backing_dev_info = {
	142	.name = "pvfs2",
	143	.ra_pages = 0,
	144	.capabilities = BDI_CAP_NO_ACCT_DIRTY \| BDI_CAP_NO_WRITEBACK,
	145	};
	146
	147	/** PVFS2 implementation of address space operations */
	148	const struct address_space_operations pvfs2_address_operations = {
	149	.readpage = pvfs2_readpage,
	150	.readpages = pvfs2_readpages,
	151	.invalidatepage = pvfs2_invalidatepage,
	152	.releasepage = pvfs2_releasepage,
	153	/* .direct_IO = pvfs2_direct_IO */
	154	};
	155
	156	static int pvfs2_setattr_size(struct inode inode, struct iattr iattr)
	157	{
	158	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
	159	struct pvfs2_kernel_op_s *new_op;
	160	loff_t orig_size = i_size_read(inode);
	161	int ret = -EINVAL;
	162
	163	gossip_debug(GOSSIP_INODE_DEBUG,
	164	"%s: %pU: Handle is %pU \| fs_id %d \| size is %llu\n",
	165	__func__,
	166	get_khandle_from_ino(inode),
	167	&pvfs2_inode->refn.khandle,
	168	pvfs2_inode->refn.fs_id,
	169	iattr->ia_size);
	170
	171	truncate_setsize(inode, iattr->ia_size);
	172
	173	new_op = op_alloc(PVFS2_VFS_OP_TRUNCATE);
	174	if (!new_op)
	175	return -ENOMEM;
	176
	177	new_op->upcall.req.truncate.refn = pvfs2_inode->refn;
	178	new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
	179
	180	ret = service_operation(new_op, __func__,
	181	get_interruptible_flag(inode));
	182
	183	/*
	184	* the truncate has no downcall members to retrieve, but
	185	* the status value tells us if it went through ok or not
	186	*/
	187	gossip_debug(GOSSIP_INODE_DEBUG,
	188	"pvfs2: pvfs2_truncate got return value of %d\n",
	189	ret);
	190
	191	op_release(new_op);
	192
	193	if (ret != 0)
	194	return ret;
	195
	196	/*
	197	* Only change the c/mtime if we are changing the size or we are
	198	* explicitly asked to change it. This handles the semantic difference
	199	* between truncate() and ftruncate() as implemented in the VFS.
	200	*
	201	* The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
	202	* special case where we need to update the times despite not having
	203	* these flags set. For all other operations the VFS set these flags
204	* explicitly if it wants a timestamp update.
205	*/
206	if (orig_size != i_size_read(inode) &&
207	!(iattr->ia_valid & (ATTR_CTIME \| ATTR_MTIME))) {
208	iattr->ia_ctime = iattr->ia_mtime =
209	current_fs_time(inode->i_sb);
210	iattr->ia_valid \|= ATTR_CTIME \| ATTR_MTIME;
211	}
212
213	return ret;
214	}
215
216	/*
217	* Change attributes of an object referenced by dentry.
218	*/
219	int pvfs2_setattr(struct dentry dentry, struct iattr iattr)
220	{
221	int ret = -EINVAL;
222	struct inode *inode = dentry->d_inode;
223
224	gossip_debug(GOSSIP_INODE_DEBUG,
225	"pvfs2_setattr: called on %s\n",
226	dentry->d_name.name);
227
228	ret = inode_change_ok(inode, iattr);
229	if (ret)
230	goto out;
231
232	if ((iattr->ia_valid & ATTR_SIZE) &&
233	iattr->ia_size != i_size_read(inode)) {
234	ret = pvfs2_setattr_size(inode, iattr);
235	if (ret)
236	goto out;
237	}
238
239	setattr_copy(inode, iattr);
240	mark_inode_dirty(inode);
241
242	ret = pvfs2_inode_setattr(inode, iattr);
243	gossip_debug(GOSSIP_INODE_DEBUG,
244	"pvfs2_setattr: inode_setattr returned %d\n",
245	ret);
246
247	if (!ret && (iattr->ia_valid & ATTR_MODE))
248	/* change mod on a file that has ACLs */
249	ret = posix_acl_chmod(inode, inode->i_mode);
250
251	out:
252	gossip_debug(GOSSIP_INODE_DEBUG, "pvfs2_setattr: returning %d\n", ret);
253	return ret;
254	}
255
256	/*
257	* Obtain attributes of an object given a dentry
258	*/
259	int pvfs2_getattr(struct vfsmount *mnt,
260	struct dentry *dentry,
261	struct kstat *kstat)
262	{
263	int ret = -ENOENT;
264	struct inode *inode = dentry->d_inode;
265	struct pvfs2_inode_s *pvfs2_inode = NULL;
266
267	gossip_debug(GOSSIP_INODE_DEBUG,
268	"pvfs2_getattr: called on %s\n",
269	dentry->d_name.name);
270
271	/*
272	* Similar to the above comment, a getattr also expects that all
273	* fields/attributes of the inode would be refreshed. So again, we
274	* dont have too much of a choice but refresh all the attributes.
275	*/
276	ret = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
277	if (ret == 0) {
278	generic_fillattr(inode, kstat);
279	/* override block size reported to stat */
280	pvfs2_inode = PVFS2_I(inode);
281	kstat->blksize = pvfs2_inode->blksize;
282	} else {
283	/* assume an I/O error and flag inode as bad */
284	gossip_debug(GOSSIP_INODE_DEBUG,
285	"%s:%s:%d calling make bad inode\n",
286	__FILE__,
287	__func__,
288	__LINE__);
289	pvfs2_make_bad_inode(inode);
290	}
291	return ret;
292	}
293
294	/* PVFS2 implementation of VFS inode operations for files */
295	struct inode_operations pvfs2_file_inode_operations = {
296	.get_acl = pvfs2_get_acl,
297	.set_acl = pvfs2_set_acl,
298	.setattr = pvfs2_setattr,
299	.getattr = pvfs2_getattr,
300	.setxattr = generic_setxattr,
301	.getxattr = generic_getxattr,
302	.listxattr = pvfs2_listxattr,
303	.removexattr = generic_removexattr,
304	};
305
306	static int pvfs2_init_iops(struct inode *inode)
307	{
308	inode->i_mapping->a_ops = &pvfs2_address_operations;
309
310	switch (inode->i_mode & S_IFMT) {
311	case S_IFREG:
312	inode->i_op = &pvfs2_file_inode_operations;
313	inode->i_fop = &pvfs2_file_operations;
314	inode->i_blkbits = PAGE_CACHE_SHIFT;
315	break;
316	case S_IFLNK:
317	inode->i_op = &pvfs2_symlink_inode_operations;
318	break;
319	case S_IFDIR:
320	inode->i_op = &pvfs2_dir_inode_operations;
321	inode->i_fop = &pvfs2_dir_operations;
322	break;
323	default:
324	gossip_debug(GOSSIP_INODE_DEBUG,
325	"%s: unsupported mode\n",
326	__func__);
327	return -EINVAL;
328	}
329
330	return 0;
331	}
332
333	/*
334	* Given a PVFS2 object identifier (fsid, handle), convert it into a ino_t type
335	* that will be used as a hash-index from where the handle will
336	* be searched for in the VFS hash table of inodes.
337	*/
338	static inline ino_t pvfs2_handle_hash(struct pvfs2_object_kref *ref)
339	{
340	if (!ref)
341	return 0;
342	return pvfs2_khandle_to_ino(&(ref->khandle));
343	}
344
345	/*
346	* Called to set up an inode from iget5_locked.
347	*/
348	static int pvfs2_set_inode(struct inode inode, void data)
349	{
350	struct pvfs2_object_kref ref = (struct pvfs2_object_kref ) data;
351	struct pvfs2_inode_s *pvfs2_inode = NULL;
352
353	/* Make sure that we have sane parameters */
354	if (!data \|\| !inode)
355	return 0;
356	pvfs2_inode = PVFS2_I(inode);
357	if (!pvfs2_inode)
358	return 0;
359	pvfs2_inode->refn.fs_id = ref->fs_id;
360	pvfs2_inode->refn.khandle = ref->khandle;
361	return 0;
362	}
363
364	/*
365	* Called to determine if handles match.
366	*/
367	static int pvfs2_test_inode(struct inode inode, void data)
368	{
369	struct pvfs2_object_kref ref = (struct pvfs2_object_kref ) data;
370	struct pvfs2_inode_s *pvfs2_inode = NULL;
371
372	pvfs2_inode = PVFS2_I(inode);
373	return (!PVFS_khandle_cmp(&(pvfs2_inode->refn.khandle), &(ref->khandle))
374	&& pvfs2_inode->refn.fs_id == ref->fs_id);
375	}
376
377	/*
378	* Front-end to lookup the inode-cache maintained by the VFS using the PVFS2
379	* file handle.
380	*
381	* @sb: the file system super block instance.
382	* @ref: The PVFS2 object for which we are trying to locate an inode structure.
383	*/
384	struct inode pvfs2_iget(struct super_block sb, struct pvfs2_object_kref *ref)
385	{
386	struct inode *inode = NULL;
387	unsigned long hash;
388	int error;
389
390	hash = pvfs2_handle_hash(ref);
391	inode = iget5_locked(sb, hash, pvfs2_test_inode, pvfs2_set_inode, ref);
392	if (!inode \|\| !(inode->i_state & I_NEW))
393	return inode;
394
395	error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
396	if (error) {
397	iget_failed(inode);
398	return ERR_PTR(error);
399	}
400
401	inode->i_ino = hash; /* needed for stat etc */
402	pvfs2_init_iops(inode);
403	unlock_new_inode(inode);
404
405	gossip_debug(GOSSIP_INODE_DEBUG,
406	"iget handle %pU, fsid %d hash %ld i_ino %lu\n",
407	&ref->khandle,
408	ref->fs_id,
409	hash,
410	inode->i_ino);
411
412	return inode;
413	}
414
415	/*
416	* Allocate an inode for a newly created file and insert it into the inode hash.
417	*/
418	struct inode pvfs2_new_inode(struct super_block sb, struct inode *dir,
419	int mode, dev_t dev, struct pvfs2_object_kref *ref)
420	{
421	unsigned long hash = pvfs2_handle_hash(ref);
422	struct inode *inode;
423	int error;
424
425	gossip_debug(GOSSIP_INODE_DEBUG,
426	"pvfs2_get_custom_inode_common: called\n"
427	"(sb is %p \| MAJOR(dev)=%u \| MINOR(dev)=%u mode=%o)\n",
428	sb,
429	MAJOR(dev),
430	MINOR(dev),
431	mode);
432
433	inode = new_inode(sb);
434	if (!inode)
435	return NULL;
436
437	pvfs2_set_inode(inode, ref);
438	inode->i_ino = hash; /* needed for stat etc */
439
440	error = pvfs2_inode_getattr(inode, PVFS_ATTR_SYS_ALL_NOHINT);
441	if (error)
442	goto out_iput;
443
444	pvfs2_init_iops(inode);
445
446	inode->i_mode = mode;
447	inode->i_uid = current_fsuid();
448	inode->i_gid = current_fsgid();
449	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
450	inode->i_size = PAGE_CACHE_SIZE;
451	inode->i_rdev = dev;
452
453	error = insert_inode_locked4(inode, hash, pvfs2_test_inode, ref);
454	if (error < 0)
455	goto out_iput;
456
457	gossip_debug(GOSSIP_INODE_DEBUG,
458	"Initializing ACL's for inode %pU\n",
459	get_khandle_from_ino(inode));
460	pvfs2_init_acl(inode, dir);
461	return inode;
462
463	out_iput:
464	iput(inode);
465	return ERR_PTR(error);
466	}