[linux-2.6-block.git] / fs / freevxfs / vxfs_inode.c

/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Veritas filesystem driver - inode routines.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/namei.h>

#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"


struct kmem_cache		*vxfs_inode_cachep;


#ifdef DIAGNOSTIC
/*
 * Dump inode contents (partially).
 */
void
vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
{
	printk(KERN_DEBUG "\n\n");
	if (ino)
		printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
	else
		printk(KERN_DEBUG "dumping unknown vxfs inode\n");

	printk(KERN_DEBUG "---------------------------\n");
	printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
	printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
			vip->vii_nlink, vip->vii_uid, vip->vii_gid);
	printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
			vip->vii_size, vip->vii_blocks);
	printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
}
#endif


/**
 * vxfs_blkiget - find inode based on extent #
 * @sbp:	superblock of the filesystem we search in
 * @extent:	number of the extent to search
 * @ino:	inode number to search
 *
 * Description:
 *  vxfs_blkiget searches inode @ino in the filesystem described by
 *  @sbp in the extent @extent.
 *  Returns the matching VxFS inode on success, else a NULL pointer.
 *
 * NOTE:
 *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the
 *  buffercache.  This function should not be used outside the
 *  read_super() method, otherwise the data may be incoherent.
 */
struct vxfs_inode_info *
vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
{
	struct buffer_head		*bp;
	u_long				block, offset;

	block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
	offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
	bp = sb_bread(sbp, block);

	if (bp && buffer_mapped(bp)) {
		struct vxfs_inode_info	*vip;
		struct vxfs_dinode	*dip;

		if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
			goto fail;
		dip = (struct vxfs_dinode *)(bp->b_data + offset);
		memcpy(vip, dip, sizeof(*vip));
#ifdef DIAGNOSTIC
		vxfs_dumpi(vip, ino);
#endif
		brelse(bp);
		return (vip);
	}

fail:
	printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
	brelse(bp);
	return NULL;
}

/**
 * __vxfs_iget - generic find inode facility
 * @sbp:		VFS superblock
 * @ino:		inode number
 * @ilistp:		inode list
 *
 * Description:
 *  Search the for inode number @ino in the filesystem
 *  described by @sbp.  Use the specified inode table (@ilistp).
 *  Returns the matching VxFS inode on success, else an error code.
 */
static struct vxfs_inode_info *
__vxfs_iget(ino_t ino, struct inode *ilistp)
{
	struct page			*pp;
	u_long				offset;

	offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
	pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);

	if (!IS_ERR(pp)) {
		struct vxfs_inode_info	*vip;
		struct vxfs_dinode	*dip;
		caddr_t			kaddr = (char *)page_address(pp);

		if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
			goto fail;
		dip = (struct vxfs_dinode *)(kaddr + offset);
		memcpy(vip, dip, sizeof(*vip));
#ifdef DIAGNOSTIC
		vxfs_dumpi(vip, ino);
#endif
		vxfs_put_page(pp);
		return (vip);
	}

	printk(KERN_WARNING "vxfs: error on page %p\n", pp);
	return ERR_CAST(pp);

fail:
	printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
	vxfs_put_page(pp);
	return ERR_PTR(-ENOMEM);
}

/**
 * vxfs_stiget - find inode using the structural inode list
 * @sbp:	VFS superblock
 * @ino:	inode #
 *
 * Description:
 *  Find inode @ino in the filesystem described by @sbp using
 *  the structural inode list.
 *  Returns the matching VxFS inode on success, else a NULL pointer.
 */
struct vxfs_inode_info *
vxfs_stiget(struct super_block *sbp, ino_t ino)
{
	struct vxfs_inode_info *vip;

	vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
	return IS_ERR(vip) ? NULL : vip;
}

/**
 * vxfs_transmod - mode for a VxFS inode
 * @vip:	VxFS inode
 *
 * Description:
 *  vxfs_transmod returns a Linux mode_t for a given
 *  VxFS inode structure.
 */
static __inline__ umode_t
vxfs_transmod(struct vxfs_inode_info *vip)
{
	umode_t			ret = vip->vii_mode & ~VXFS_TYPE_MASK;

	if (VXFS_ISFIFO(vip))
		ret |= S_IFIFO;
	if (VXFS_ISCHR(vip))
		ret |= S_IFCHR;
	if (VXFS_ISDIR(vip))
		ret |= S_IFDIR;
	if (VXFS_ISBLK(vip))
		ret |= S_IFBLK;
	if (VXFS_ISLNK(vip))
		ret |= S_IFLNK;
	if (VXFS_ISREG(vip))
		ret |= S_IFREG;
	if (VXFS_ISSOC(vip))
		ret |= S_IFSOCK;

	return (ret);
}

/**
 * vxfs_iinit- helper to fill inode fields
 * @ip:		VFS inode
 * @vip:	VxFS inode
 *
 * Description:
 *  vxfs_instino is a helper function to fill in all relevant
 *  fields in @ip from @vip.
 */
static void
vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
{

	ip->i_mode = vxfs_transmod(vip);
	i_uid_write(ip, (uid_t)vip->vii_uid);
	i_gid_write(ip, (gid_t)vip->vii_gid);

	set_nlink(ip, vip->vii_nlink);
	ip->i_size = vip->vii_size;

	ip->i_atime.tv_sec = vip->vii_atime;
	ip->i_ctime.tv_sec = vip->vii_ctime;
	ip->i_mtime.tv_sec = vip->vii_mtime;
	ip->i_atime.tv_nsec = 0;
	ip->i_ctime.tv_nsec = 0;
	ip->i_mtime.tv_nsec = 0;

	ip->i_blocks = vip->vii_blocks;
	ip->i_generation = vip->vii_gen;

	ip->i_private = vip;
	
}

/**
 * vxfs_get_fake_inode - get fake inode structure
 * @sbp:		filesystem superblock
 * @vip:		fspriv inode
 *
 * Description:
 *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
 *  superblock, vxfs_inode pair.
 *  Returns the filled VFS inode.
 */
struct inode *
vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
{
	struct inode			*ip = NULL;

	if ((ip = new_inode(sbp))) {
		ip->i_ino = get_next_ino();
		vxfs_iinit(ip, vip);
		ip->i_mapping->a_ops = &vxfs_aops;
	}
	return (ip);
}

/**
 * vxfs_put_fake_inode - free faked inode
 * *ip:			VFS inode
 *
 * Description:
 *  vxfs_put_fake_inode frees all data associated with @ip.
 */
void
vxfs_put_fake_inode(struct inode *ip)
{
	iput(ip);
}

/**
 * vxfs_iget - get an inode
 * @sbp:	the superblock to get the inode for
 * @ino:	the number of the inode to get
 *
 * Description:
 *  vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
 *  in all relevant fields in the new inode.
 */
struct inode *
vxfs_iget(struct super_block *sbp, ino_t ino)
{
	struct vxfs_inode_info		*vip;
	const struct address_space_operations	*aops;
	struct inode *ip;

	ip = iget_locked(sbp, ino);
	if (!ip)
		return ERR_PTR(-ENOMEM);
	if (!(ip->i_state & I_NEW))
		return ip;

	vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
	if (IS_ERR(vip)) {
		iget_failed(ip);
		return ERR_CAST(vip);
	}

	vxfs_iinit(ip, vip);

	if (VXFS_ISIMMED(vip))
		aops = &vxfs_immed_aops;
	else
		aops = &vxfs_aops;

	if (S_ISREG(ip->i_mode)) {
		ip->i_fop = &generic_ro_fops;
		ip->i_mapping->a_ops = aops;
	} else if (S_ISDIR(ip->i_mode)) {
		ip->i_op = &vxfs_dir_inode_ops;
		ip->i_fop = &vxfs_dir_operations;
		ip->i_mapping->a_ops = aops;
	} else if (S_ISLNK(ip->i_mode)) {
		if (!VXFS_ISIMMED(vip)) {
			ip->i_op = &page_symlink_inode_operations;
			inode_nohighmem(ip);
			ip->i_mapping->a_ops = &vxfs_aops;
		} else {
			ip->i_op = &simple_symlink_inode_operations;
			ip->i_link = vip->vii_immed.vi_immed;
			nd_terminate_link(ip->i_link, ip->i_size,
					  sizeof(vip->vii_immed.vi_immed) - 1);
		}
	} else
		init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));

	unlock_new_inode(ip);
	return ip;
}

static void vxfs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(vxfs_inode_cachep, inode->i_private);
}

/**
 * vxfs_evict_inode - remove inode from main memory
 * @ip:		inode to discard.
 *
 * Description:
 *  vxfs_evict_inode() is called on the final iput and frees the private
 *  inode area.
 */
void
vxfs_evict_inode(struct inode *ip)
{
	truncate_inode_pages_final(&ip->i_data);
	clear_inode(ip);
	call_rcu(&ip->i_rcu, vxfs_i_callback);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2000-2001 Christoph Hellwig.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions, and the following disclaimer,
	10	* without modification.
	11	* 2. The name of the author may not be used to endorse or promote products
	12	* derived from this software without specific prior written permission.
	13	*
	14	* Alternatively, this software may be distributed under the terms of the
	15	* GNU General Public License ("GPL").
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
	21	* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	/*
	31	* Veritas filesystem driver - inode routines.
	32	*/
	33	#include <linux/fs.h>
	34	#include <linux/buffer_head.h>
	35	#include <linux/pagemap.h>
	36	#include <linux/kernel.h>
	37	#include <linux/slab.h>
df64c082	38	#include <linux/namei.h>
1da177e4 LT	39
	40	#include "vxfs.h"
	41	#include "vxfs_inode.h"
	42	#include "vxfs_extern.h"
	43
	44
e18b890b	45	struct kmem_cache *vxfs_inode_cachep;
1da177e4 LT	46
	47
	48	#ifdef DIAGNOSTIC
	49	/*
	50	* Dump inode contents (partially).
	51	*/
	52	void
	53	vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
	54	{
	55	printk(KERN_DEBUG "\n\n");
	56	if (ino)
	57	printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
	58	else
	59	printk(KERN_DEBUG "dumping unknown vxfs inode\n");
	60
	61	printk(KERN_DEBUG "---------------------------\n");
	62	printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
	63	printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
	64	vip->vii_nlink, vip->vii_uid, vip->vii_gid);
	65	printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
	66	vip->vii_size, vip->vii_blocks);
	67	printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
	68	}
	69	#endif
	70
	71
	72	/**
	73	* vxfs_blkiget - find inode based on extent #
	74	* @sbp: superblock of the filesystem we search in
	75	* @extent: number of the extent to search
	76	* @ino: inode number to search
	77	*
	78	* Description:
	79	* vxfs_blkiget searches inode @ino in the filesystem described by
	80	* @sbp in the extent @extent.
	81	* Returns the matching VxFS inode on success, else a NULL pointer.
	82	*
	83	* NOTE:
	84	* While __vxfs_iget uses the pagecache vxfs_blkiget uses the
	85	* buffercache. This function should not be used outside the
	86	* read_super() method, otherwise the data may be incoherent.
	87	*/
	88	struct vxfs_inode_info *
	89	vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
	90	{
	91	struct buffer_head *bp;
	92	u_long block, offset;
	93
	94	block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
	95	offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
	96	bp = sb_bread(sbp, block);
	97
82f703bb	98	if (bp && buffer_mapped(bp)) {
1da177e4 LT	99	struct vxfs_inode_info *vip;
	100	struct vxfs_dinode *dip;
	101
e94b1766	102	if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
1da177e4 LT	103	goto fail;
	104	dip = (struct vxfs_dinode *)(bp->b_data + offset);
	105	memcpy(vip, dip, sizeof(*vip));
	106	#ifdef DIAGNOSTIC
	107	vxfs_dumpi(vip, ino);
	108	#endif
	109	brelse(bp);
	110	return (vip);
	111	}
	112
	113	fail:
	114	printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
	115	brelse(bp);
	116	return NULL;
	117	}
	118
	119	/**
	120	* __vxfs_iget - generic find inode facility
	121	* @sbp: VFS superblock
	122	* @ino: inode number
	123	* @ilistp: inode list
	124	*
	125	* Description:
	126	* Search the for inode number @ino in the filesystem
	127	* described by @sbp. Use the specified inode table (@ilistp).
d0b07948	128	* Returns the matching VxFS inode on success, else an error code.
1da177e4 LT	129	*/
	130	static struct vxfs_inode_info *
	131	__vxfs_iget(ino_t ino, struct inode *ilistp)
	132	{
	133	struct page *pp;
	134	u_long offset;
	135
	136	offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
	137	pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);
	138
	139	if (!IS_ERR(pp)) {
	140	struct vxfs_inode_info *vip;
	141	struct vxfs_dinode *dip;
	142	caddr_t kaddr = (char *)page_address(pp);
	143
e94b1766	144	if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_KERNEL)))
1da177e4 LT	145	goto fail;
	146	dip = (struct vxfs_dinode *)(kaddr + offset);
	147	memcpy(vip, dip, sizeof(*vip));
	148	#ifdef DIAGNOSTIC
	149	vxfs_dumpi(vip, ino);
	150	#endif
	151	vxfs_put_page(pp);
	152	return (vip);
	153	}
	154
	155	printk(KERN_WARNING "vxfs: error on page %p\n", pp);
d0b07948	156	return ERR_CAST(pp);
1da177e4 LT	157
	158	fail:
	159	printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
	160	vxfs_put_page(pp);
d0b07948	161	return ERR_PTR(-ENOMEM);
1da177e4 LT	162	}
	163
	164	/**
	165	* vxfs_stiget - find inode using the structural inode list
	166	* @sbp: VFS superblock
	167	* @ino: inode #
	168	*
	169	* Description:
	170	* Find inode @ino in the filesystem described by @sbp using
	171	* the structural inode list.
	172	* Returns the matching VxFS inode on success, else a NULL pointer.
	173	*/
	174	struct vxfs_inode_info *
	175	vxfs_stiget(struct super_block *sbp, ino_t ino)
	176	{
d0b07948 DH	177	struct vxfs_inode_info *vip;
	178
	179	vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
	180	return IS_ERR(vip) ? NULL : vip;
1da177e4 LT	181	}
	182
	183	/**
	184	* vxfs_transmod - mode for a VxFS inode
	185	* @vip: VxFS inode
	186	*
	187	* Description:
	188	* vxfs_transmod returns a Linux mode_t for a given
	189	* VxFS inode structure.
	190	*/
175a4eb7	191	static __inline__ umode_t
1da177e4 LT	192	vxfs_transmod(struct vxfs_inode_info *vip)
1da177e4 LT	193	{
175a4eb7	194	umode_t ret = vip->vii_mode & ~VXFS_TYPE_MASK;
1da177e4 LT	195
	196	if (VXFS_ISFIFO(vip))
	197	ret \|= S_IFIFO;
	198	if (VXFS_ISCHR(vip))
	199	ret \|= S_IFCHR;
	200	if (VXFS_ISDIR(vip))
	201	ret \|= S_IFDIR;
	202	if (VXFS_ISBLK(vip))
	203	ret \|= S_IFBLK;
	204	if (VXFS_ISLNK(vip))
	205	ret \|= S_IFLNK;
	206	if (VXFS_ISREG(vip))
	207	ret \|= S_IFREG;
	208	if (VXFS_ISSOC(vip))
	209	ret \|= S_IFSOCK;
	210
	211	return (ret);
	212	}
	213
	214	/**
	215	* vxfs_iinit- helper to fill inode fields
	216	* @ip: VFS inode
	217	* @vip: VxFS inode
	218	*
	219	* Description:
	220	* vxfs_instino is a helper function to fill in all relevant
	221	* fields in @ip from @vip.
	222	*/
	223	static void
	224	vxfs_iinit(struct inode ip, struct vxfs_inode_info vip)
	225	{
	226
	227	ip->i_mode = vxfs_transmod(vip);
2f83ffa8 EB	228	i_uid_write(ip, (uid_t)vip->vii_uid);
2f83ffa8 EB	229	i_gid_write(ip, (gid_t)vip->vii_gid);
1da177e4	230
bfe86848	231	set_nlink(ip, vip->vii_nlink);
1da177e4 LT	232	ip->i_size = vip->vii_size;
	233
	234	ip->i_atime.tv_sec = vip->vii_atime;
	235	ip->i_ctime.tv_sec = vip->vii_ctime;
	236	ip->i_mtime.tv_sec = vip->vii_mtime;
	237	ip->i_atime.tv_nsec = 0;
	238	ip->i_ctime.tv_nsec = 0;
	239	ip->i_mtime.tv_nsec = 0;
	240
1da177e4 LT	241	ip->i_blocks = vip->vii_blocks;
	242	ip->i_generation = vip->vii_gen;
	243
8e18e294	244	ip->i_private = vip;
1da177e4 LT	245
	246	}
	247
	248	/**
	249	* vxfs_get_fake_inode - get fake inode structure
	250	* @sbp: filesystem superblock
	251	* @vip: fspriv inode
	252	*
	253	* Description:
	254	* vxfs_fake_inode gets a fake inode (not in the inode hash) for a
	255	* superblock, vxfs_inode pair.
	256	* Returns the filled VFS inode.
	257	*/
	258	struct inode *
	259	vxfs_get_fake_inode(struct super_block sbp, struct vxfs_inode_info vip)
	260	{
	261	struct inode *ip = NULL;
	262
	263	if ((ip = new_inode(sbp))) {
85fe4025	264	ip->i_ino = get_next_ino();
1da177e4 LT	265	vxfs_iinit(ip, vip);
	266	ip->i_mapping->a_ops = &vxfs_aops;
	267	}
	268	return (ip);
	269	}
	270
	271	/**
	272	* vxfs_put_fake_inode - free faked inode
	273	* *ip: VFS inode
	274	*
	275	* Description:
70f23fd6	276	* vxfs_put_fake_inode frees all data associated with @ip.
1da177e4 LT	277	*/
	278	void
	279	vxfs_put_fake_inode(struct inode *ip)
	280	{
	281	iput(ip);
	282	}
	283
	284	/**
d0b07948 DH	285	* vxfs_iget - get an inode
	286	* @sbp: the superblock to get the inode for
	287	* @ino: the number of the inode to get
1da177e4 LT	288	*
1da177e4 LT	289	* Description:
d0b07948 DH	290	* vxfs_read_inode creates an inode, reads the disk inode for @ino and fills
d0b07948 DH	291	* in all relevant fields in the new inode.
1da177e4	292	*/
d0b07948 DH	293	struct inode *
d0b07948 DH	294	vxfs_iget(struct super_block *sbp, ino_t ino)
1da177e4	295	{
1da177e4	296	struct vxfs_inode_info *vip;
f5e54d6e	297	const struct address_space_operations *aops;
d0b07948 DH	298	struct inode *ip;
	299
	300	ip = iget_locked(sbp, ino);
	301	if (!ip)
	302	return ERR_PTR(-ENOMEM);
	303	if (!(ip->i_state & I_NEW))
	304	return ip;
	305
	306	vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
	307	if (IS_ERR(vip)) {
	308	iget_failed(ip);
	309	return ERR_CAST(vip);
	310	}
1da177e4 LT	311
	312	vxfs_iinit(ip, vip);
	313
	314	if (VXFS_ISIMMED(vip))
	315	aops = &vxfs_immed_aops;
	316	else
	317	aops = &vxfs_aops;
	318
	319	if (S_ISREG(ip->i_mode)) {
dc487002	320	ip->i_fop = &generic_ro_fops;
1da177e4 LT	321	ip->i_mapping->a_ops = aops;
	322	} else if (S_ISDIR(ip->i_mode)) {
	323	ip->i_op = &vxfs_dir_inode_ops;
	324	ip->i_fop = &vxfs_dir_operations;
	325	ip->i_mapping->a_ops = aops;
	326	} else if (S_ISLNK(ip->i_mode)) {
	327	if (!VXFS_ISIMMED(vip)) {
	328	ip->i_op = &page_symlink_inode_operations;
21fc61c7	329	inode_nohighmem(ip);
1da177e4	330	ip->i_mapping->a_ops = &vxfs_aops;
a63d0ff3	331	} else {
df64c082 AV	332	ip->i_op = &simple_symlink_inode_operations;
	333	ip->i_link = vip->vii_immed.vi_immed;
	334	nd_terminate_link(ip->i_link, ip->i_size,
	335	sizeof(vip->vii_immed.vi_immed) - 1);
a63d0ff3	336	}
1da177e4 LT	337	} else
	338	init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));
	339
d0b07948 DH	340	unlock_new_inode(ip);
d0b07948 DH	341	return ip;
1da177e4 LT	342	}
1da177e4 LT	343
fa0d7e3d NP	344	static void vxfs_i_callback(struct rcu_head *head)
	345	{
	346	struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d NP	347	kmem_cache_free(vxfs_inode_cachep, inode->i_private);
	348	}
	349
1da177e4	350	/**
b57922d9	351	* vxfs_evict_inode - remove inode from main memory
1da177e4 LT	352	* @ip: inode to discard.
	353	*
	354	* Description:
b57922d9	355	* vxfs_evict_inode() is called on the final iput and frees the private
1da177e4 LT	356	* inode area.
	357	*/
	358	void
b57922d9	359	vxfs_evict_inode(struct inode *ip)
1da177e4	360	{
91b0abe3	361	truncate_inode_pages_final(&ip->i_data);
dbd5768f	362	clear_inode(ip);
fa0d7e3d	363	call_rcu(&ip->i_rcu, vxfs_i_callback);
1da177e4	364	}