<commit_before>/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/posix_acl.h>
#include <linux/sort.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>

#include "gfs2.h"
#include "lm_interface.h"
#include "incore.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "eattr.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "ops_address.h"
#include "ops_file.h"
#include "ops_inode.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"

/**
 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
 * @ip: The GFS2 inode (with embedded disk inode data)
 * @inode:  The Linux VFS inode
 *
 */

void gfs2_inode_attr_in(struct gfs2_inode *ip)
{
	struct inode *inode = &ip->i_inode;

	inode->i_ino = ip->i_num.no_addr;

	switch (ip->i_di.di_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
		break;
	default:
		inode->i_rdev = 0;
		break;
	};

	inode->i_mode = ip->i_di.di_mode;
	inode->i_nlink = ip->i_di.di_nlink;
	inode->i_uid = ip->i_di.di_uid;
	inode->i_gid = ip->i_di.di_gid;
	i_size_write(inode, ip->i_di.di_size);
	inode->i_atime.tv_sec = ip->i_di.di_atime;
	inode->i_mtime.tv_sec = ip->i_di.di_mtime;
	inode->i_ctime.tv_sec = ip->i_di.di_ctime;
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = ip->i_di.di_blocks <<
		(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);

	if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;

	if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
}

/**
 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
 * @ip: The GFS2 inode
 *
 * Only copy out the attributes that we want the VFS layer
 * to be able to modify.
 */

void gfs2_inode_attr_out(struct gfs2_inode *ip)
{
	struct inode *inode = &ip->i_inode;

	gfs2_assert_withdraw(GFS2_SB(inode),
		(ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
	ip->i_di.di_mode = inode->i_mode;
	ip->i_di.di_uid = inode->i_uid;
	ip->i_di.di_gid = inode->i_gid;
	ip->i_di.di_atime = inode->i_atime.tv_sec;
	ip->i_di.di_mtime = inode->i_mtime.tv_sec;
	ip->i_di.di_ctime = inode->i_ctime.tv_sec;
}

static int iget_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_inum *inum = opaque;

	if (ip && ip->i_num.no_addr == inum->no_addr)
		return 1;

	return 0;
}

static int iget_set(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_inum *inum = opaque;

	ip->i_num = *inum;
	return 0;
}

struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
{
	return ilookup5(sb, (unsigned long)inum->no_formal_ino,
			iget_test, inum);
}

static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
{
	return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
		     iget_test, iget_set, inum);
}

/**
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
 * @inum: The inode number
 * @type: The type of the inode
 *
 * Returns: A VFS inode, or an error
 */

struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
{
	struct inode *inode = gfs2_iget(sb, inum);
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_glock *io_gl;
	int error;

	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
		umode_t mode = DT2IF(type);
		inode->u.generic_ip = ip;
		inode->i_mode = mode;

		if (S_ISREG(mode)) {
			inode->i_op = &gfs2_file_iops;
			inode->i_fop = &gfs2_file_fops;
			inode->i_mapping->a_ops = &gfs2_file_aops;
		} else if (S_ISDIR(mode)) {
			inode->i_op = &gfs2_dir_iops;
			inode->i_fop = &gfs2_dir_fops;
		} else if (S_ISLNK(mode)) {
			inode->i_op = &gfs2_symlink_iops;
		} else {
			inode->i_op = &gfs2_dev_iops;
		}

		error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
		if (unlikely(error))
			goto fail;
		ip->i_gl->gl_object = ip;

		error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
		if (unlikely(error))
			goto fail_put;

		ip->i_vn = ip->i_gl->gl_vn - 1;
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
			goto fail_iopen;

		gfs2_glock_put(io_gl);
		unlock_new_inode(inode);
	}

	return inode;
fail_iopen:
	gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
	gfs2_glock_put(ip->i_gl);
fail:
	iput(inode);
	return ERR_PTR(error);
}

/**
 * gfs2_inode_refresh - Refresh the incore copy of the dinode
 * @ip: The GFS2 inode
 *
 * Returns: errno
 */

int gfs2_inode_refresh(struct gfs2_inode *ip)
{
	struct buffer_head *dibh;
	int error;

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
		brelse(dibh);
		return -EIO;
	}

	gfs2_dinode_in(&ip->i_di, dibh->b_data);

	brelse(dibh);

	if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}
	if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
		return -ESTALE;

	ip->i_vn = ip->i_gl->gl_vn;

	return 0;
}

int gfs2_dinode_dealloc(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al;
	struct gfs2_rgrpd *rgd;
	int error;

	if (ip->i_di.di_blocks != 1) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}

	al = gfs2_alloc_get(ip);

	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
	if (error)
		goto out;

	error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
	if (error)
		goto out_qs;

	rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
	if (!rgd) {
		gfs2_consist_inode(ip);
		error = -EIO;
		goto out_rindex_relse;
	}

	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
				   &al->al_rgd_gh);
	if (error)
		goto out_rindex_relse;

	error = gfs2_trans_begin(sdp, RES_RG_BIT + 
				 RES_STATFS + RES_QUOTA, 1);
	if (error)
		goto out_rg_gunlock;

	gfs2_trans_add_gl(ip->i_gl);

	gfs2_free_di(rgd, ip);

	gfs2_trans_end(sdp);
	clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);

out_rg_gunlock:
	gfs2_glock_dq_uninit(&al->al_rgd_gh);
out_rindex_relse:
	gfs2_glock_dq_uninit(&al->al_ri_gh);
out_qs:
	gfs2_quota_unhold(ip);
out:
	gfs2_alloc_put(ip);
	return error;
}

/**
 * gfs2_change_nlink - Change nlink count on inode
 * @ip: The GFS2 inode
 * @diff: The change in the nlink count required
 *
 * Returns: errno
 */

int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
{
	struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
	struct buffer_head *dibh;
	uint32_t nlink;
	int error;

	BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
	nlink = ip->i_di.di_nlink + diff;

	/* If we are reducing the nlink count, but the new value ends up being
	   bigger than the old one, we must have underflowed. */
	if (diff < 0 && nlink > ip->i_di.di_nlink) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

	ip->i_di.di_nlink = nlink;
	ip->i_di.di_ctime = get_seconds();
	ip->i_inode.i_nlink = nlink;

	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
	gfs2_dinode_out(&ip->i_di, dibh->b_data);
	brelse(dibh);
	mark_inode_dirty(&ip->i_inode);

	if (ip->i_di.di_nlink == 0) {
		struct gfs2_rgrpd *rgd;
		struct gfs2_holder ri_gh, rg_gh;

		error = gfs2_rindex_hold(sdp, &ri_gh);
		if (error)
			goto out;
		error = -EIO;
		rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
		if (!rgd)
			goto out_norgrp;
		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
		if (error)
			goto out_norgrp;

		gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
		gfs2_glock_dq_uninit(&rg_gh);
out_norgrp:
		gfs2_glock_dq_uninit(&ri_gh);
	}
out:
	return error;
}

struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
	gfs2_str2qstr(&qstr, name);
	return gfs2_lookupi(dip, &qstr, 1, NULL);
}


/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
 * @is_root is true.
 *
 * Returns: errno
 */

struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
			   int is_root, struct nameidata *nd)
		 
{
	struct super_block *sb = dir->i_sb;
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_holder d_gh;
	struct gfs2_inum inum;
	unsigned int type;
	int error = 0;
	struct inode *inode = NULL;

	if (!name->len || name->len > GFS2_FNAMESIZE)
		return ERR_PTR(-ENAMETOOLONG);

	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
	     dir == sb->s_root->d_inode)) {
		igrab(dir);
		return dir;
	}

	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
	if (error)
		return ERR_PTR(error);

	if (!is_root) {
		error = permission(dir, MAY_EXEC, NULL);
		if (error)
			goto out;
	}

	error = gfs2_dir_search(dir, name, &inum, &type);
	if (error)
		goto out;

	inode = gfs2_inode_lookup(sb, &inum, type);

out:
	gfs2_glock_dq_uninit(&d_gh);
	if (error == -ENOENT)
		return NULL;
	return inode;
}

static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
	struct buffer_head *bh;
	struct gfs2_inum_range ir;
	int error;

	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
	if (error)
		return error;
	mutex_lock(&sdp->sd_inum_mutex);

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error) {
		mutex_unlock(&sdp->sd_inum_mutex);
		gfs2_trans_end(sdp);
		return error;
	}

	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (ir.ir_length) {
		*formal_ino = ir.ir_start++;
		ir.ir_length--;
		gfs2_trans_add_bh(ip->i_gl, bh, 1);
		gfs2_inum_range_out(&ir,
				    bh->b_data + sizeof(struct gfs2_dinode));
		brelse(bh);
		mutex_unlock(&sdp->sd_inum_mutex);
		gfs2_trans_end(sdp);
		return 0;
	}

	brelse(bh);

	mutex_unlock(&sdp->sd_inum_mutex);
	gfs2_trans_end(sdp);

	return 1;
}

static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
	struct gfs2_holder gh;
	struct buffer_head *bh;
	struct gfs2_inum_range ir;
	int error;

	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	if (error)
		return error;

	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
	if (error)
		goto out;
	mutex_lock(&sdp->sd_inum_mutex);

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error)
		goto out_end_trans;
	
	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (!ir.ir_length) {
		struct buffer_head *m_bh;
		uint64_t x, y;

		error = gfs2_meta_inode_buffer(m_ip, &m_bh);
		if (error)
			goto out_brelse;

		x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
		x = y = be64_to_cpu(x);
		ir.ir_start = x;
		ir.ir_length = GFS2_INUM_QUANTUM;
		x += GFS2_INUM_QUANTUM;
		if (x < y)
			gfs2_consist_inode(m_ip);
		x = cpu_to_be64(x);
		gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
		*(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;

		brelse(m_bh);
	}

	*formal_ino = ir.ir_start++;
	ir.ir_length--;

	gfs2_trans_add_bh(ip->i_gl, bh, 1);
	gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));

 out_brelse:
	brelse(bh);

 out_end_trans:
	mutex_unlock(&sdp->sd_inum_mutex);
	gfs2_trans_end(sdp);

 out:
	gfs2_glock_dq_uninit(&gh);

	return error;
}

static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
{
	int error;

	error = pick_formal_ino_1(sdp, inum);
	if (error <= 0)
		return error;

	error = pick_formal_ino_2(sdp, inum);

	return error;
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
		     unsigned int mode)
{
	int error;

	error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
	if (!dip->i_di.di_nlink)
		return -EPERM;

	error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
	switch (error) {
	case -ENOENT:
		error = 0;
		break;
	case 0:
		return -EEXIST;
	default:
		return error;
	}

	if (dip->i_di.di_entries == (uint32_t)-1)
		return -EFBIG;
	if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
		return -EMLINK;

	return 0;
}

static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
			       unsigned int *uid, unsigned int *gid)
{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
	    (dip->i_di.di_mode & S_ISUID) &&
	    dip->i_di.di_uid) {
		if (S_ISDIR(*mode))
			*mode |= S_ISUID;
		else if (dip->i_di.di_uid != current->fsuid)
			*mode &= ~07111;
		*uid = dip->i_di.di_uid;
	} else
		*uid = current->fsuid;

	if (dip->i_di.di_mode & S_ISGID) {
		if (S_ISDIR(*mode))
			*mode |= S_ISGID;
		*gid = dip->i_di.di_gid;
	} else
		*gid = current->fsgid;
}

static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
			u64 *generation)
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	int error;

	gfs2_alloc_get(dip);

	dip->i_alloc.al_requested = RES_DINODE;
	error = gfs2_inplace_reserve(dip);
	if (error)
		goto out;

	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
	if (error)
		goto out_ipreserv;

	inum->no_addr = gfs2_alloc_di(dip, generation);

	gfs2_trans_end(sdp);

out_ipreserv:
	gfs2_inplace_release(dip);

out:
	gfs2_alloc_put(dip);

	return error;
}

/**
 * init_dinode - Fill in a new dinode structure
 * @dip: the directory this inode is being created in
 * @gl: The glock covering the new inode
 * @inum: the inode number
 * @mode: the file permissions
 * @uid:
 * @gid:
 *
 */

static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
			const struct gfs2_inum *inum, unsigned int mode,
			unsigned int uid, unsigned int gid,
			const u64 *generation)
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

	dibh = gfs2_meta_new(gl, inum->no_addr);
	gfs2_trans_add_bh(gl, dibh, 1);
	gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
	di = (struct gfs2_dinode *)dibh->b_data;

	di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
	di->di_num.no_addr = cpu_to_be64(inum->no_addr);
	di->di_mode = cpu_to_be32(mode);
	di->di_uid = cpu_to_be32(uid);
	di->di_gid = cpu_to_be32(gid);
	di->di_nlink = cpu_to_be32(0);
	di->di_size = cpu_to_be64(0);
	di->di_blocks = cpu_to_be64(1);
	di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
	di->di_major = di->di_minor = cpu_to_be32(0);
	di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
	di->di_generation = cpu_to_be64(*generation);
	di->di_flags = cpu_to_be32(0);

	if (S_ISREG(mode)) {
		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
		    gfs2_tune_get(sdp, gt_new_files_jdata))
			di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
		    gfs2_tune_get(sdp, gt_new_files_directio))
			di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
	} else if (S_ISDIR(mode)) {
		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
					    GFS2_DIF_INHERIT_DIRECTIO);
		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
					    GFS2_DIF_INHERIT_JDATA);
	}

	di->__pad1 = 0;
	di->di_height = cpu_to_be32(0);
	di->__pad2 = 0;
	di->__pad3 = 0;
	di->di_depth = cpu_to_be16(0);
	di->di_entries = cpu_to_be32(0);
	memset(&di->__pad4, 0, sizeof(di->__pad4));
	di->di_eattr = cpu_to_be64(0);
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));

	brelse(dibh);
}<commit_msg>[PATCH] patch to init di_payload_format field in gfs2_dinode<commit_after>/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/posix_acl.h>
#include <linux/sort.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>

#include "gfs2.h"
#include "lm_interface.h"
#include "incore.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "eattr.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "ops_address.h"
#include "ops_file.h"
#include "ops_inode.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"

/**
 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
 * @ip: The GFS2 inode (with embedded disk inode data)
 * @inode:  The Linux VFS inode
 *
 */

void gfs2_inode_attr_in(struct gfs2_inode *ip)
{
	struct inode *inode = &ip->i_inode;

	inode->i_ino = ip->i_num.no_addr;

	switch (ip->i_di.di_mode & S_IFMT) {
	case S_IFBLK:
	case S_IFCHR:
		inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
		break;
	default:
		inode->i_rdev = 0;
		break;
	};

	inode->i_mode = ip->i_di.di_mode;
	inode->i_nlink = ip->i_di.di_nlink;
	inode->i_uid = ip->i_di.di_uid;
	inode->i_gid = ip->i_di.di_gid;
	i_size_write(inode, ip->i_di.di_size);
	inode->i_atime.tv_sec = ip->i_di.di_atime;
	inode->i_mtime.tv_sec = ip->i_di.di_mtime;
	inode->i_ctime.tv_sec = ip->i_di.di_ctime;
	inode->i_atime.tv_nsec = 0;
	inode->i_mtime.tv_nsec = 0;
	inode->i_ctime.tv_nsec = 0;
	inode->i_blksize = PAGE_SIZE;
	inode->i_blocks = ip->i_di.di_blocks <<
		(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);

	if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
		inode->i_flags |= S_IMMUTABLE;
	else
		inode->i_flags &= ~S_IMMUTABLE;

	if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
		inode->i_flags |= S_APPEND;
	else
		inode->i_flags &= ~S_APPEND;
}

/**
 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
 * @ip: The GFS2 inode
 *
 * Only copy out the attributes that we want the VFS layer
 * to be able to modify.
 */

void gfs2_inode_attr_out(struct gfs2_inode *ip)
{
	struct inode *inode = &ip->i_inode;

	gfs2_assert_withdraw(GFS2_SB(inode),
		(ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
	ip->i_di.di_mode = inode->i_mode;
	ip->i_di.di_uid = inode->i_uid;
	ip->i_di.di_gid = inode->i_gid;
	ip->i_di.di_atime = inode->i_atime.tv_sec;
	ip->i_di.di_mtime = inode->i_mtime.tv_sec;
	ip->i_di.di_ctime = inode->i_ctime.tv_sec;
}

static int iget_test(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_inum *inum = opaque;

	if (ip && ip->i_num.no_addr == inum->no_addr)
		return 1;

	return 0;
}

static int iget_set(struct inode *inode, void *opaque)
{
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_inum *inum = opaque;

	ip->i_num = *inum;
	return 0;
}

struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
{
	return ilookup5(sb, (unsigned long)inum->no_formal_ino,
			iget_test, inum);
}

static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
{
	return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
		     iget_test, iget_set, inum);
}

/**
 * gfs2_inode_lookup - Lookup an inode
 * @sb: The super block
 * @inum: The inode number
 * @type: The type of the inode
 *
 * Returns: A VFS inode, or an error
 */

struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
{
	struct inode *inode = gfs2_iget(sb, inum);
	struct gfs2_inode *ip = GFS2_I(inode);
	struct gfs2_glock *io_gl;
	int error;

	if (inode->i_state & I_NEW) {
		struct gfs2_sbd *sdp = GFS2_SB(inode);
		umode_t mode = DT2IF(type);
		inode->u.generic_ip = ip;
		inode->i_mode = mode;

		if (S_ISREG(mode)) {
			inode->i_op = &gfs2_file_iops;
			inode->i_fop = &gfs2_file_fops;
			inode->i_mapping->a_ops = &gfs2_file_aops;
		} else if (S_ISDIR(mode)) {
			inode->i_op = &gfs2_dir_iops;
			inode->i_fop = &gfs2_dir_fops;
		} else if (S_ISLNK(mode)) {
			inode->i_op = &gfs2_symlink_iops;
		} else {
			inode->i_op = &gfs2_dev_iops;
		}

		error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
		if (unlikely(error))
			goto fail;
		ip->i_gl->gl_object = ip;

		error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
		if (unlikely(error))
			goto fail_put;

		ip->i_vn = ip->i_gl->gl_vn - 1;
		error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
		if (unlikely(error))
			goto fail_iopen;

		gfs2_glock_put(io_gl);
		unlock_new_inode(inode);
	}

	return inode;
fail_iopen:
	gfs2_glock_put(io_gl);
fail_put:
	ip->i_gl->gl_object = NULL;
	gfs2_glock_put(ip->i_gl);
fail:
	iput(inode);
	return ERR_PTR(error);
}

/**
 * gfs2_inode_refresh - Refresh the incore copy of the dinode
 * @ip: The GFS2 inode
 *
 * Returns: errno
 */

int gfs2_inode_refresh(struct gfs2_inode *ip)
{
	struct buffer_head *dibh;
	int error;

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
		brelse(dibh);
		return -EIO;
	}

	gfs2_dinode_in(&ip->i_di, dibh->b_data);

	brelse(dibh);

	if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}
	if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
		return -ESTALE;

	ip->i_vn = ip->i_gl->gl_vn;

	return 0;
}

int gfs2_dinode_dealloc(struct gfs2_inode *ip)
{
	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
	struct gfs2_alloc *al;
	struct gfs2_rgrpd *rgd;
	int error;

	if (ip->i_di.di_blocks != 1) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}

	al = gfs2_alloc_get(ip);

	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
	if (error)
		goto out;

	error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
	if (error)
		goto out_qs;

	rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
	if (!rgd) {
		gfs2_consist_inode(ip);
		error = -EIO;
		goto out_rindex_relse;
	}

	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
				   &al->al_rgd_gh);
	if (error)
		goto out_rindex_relse;

	error = gfs2_trans_begin(sdp, RES_RG_BIT + 
				 RES_STATFS + RES_QUOTA, 1);
	if (error)
		goto out_rg_gunlock;

	gfs2_trans_add_gl(ip->i_gl);

	gfs2_free_di(rgd, ip);

	gfs2_trans_end(sdp);
	clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);

out_rg_gunlock:
	gfs2_glock_dq_uninit(&al->al_rgd_gh);
out_rindex_relse:
	gfs2_glock_dq_uninit(&al->al_ri_gh);
out_qs:
	gfs2_quota_unhold(ip);
out:
	gfs2_alloc_put(ip);
	return error;
}

/**
 * gfs2_change_nlink - Change nlink count on inode
 * @ip: The GFS2 inode
 * @diff: The change in the nlink count required
 *
 * Returns: errno
 */

int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
{
	struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
	struct buffer_head *dibh;
	uint32_t nlink;
	int error;

	BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
	nlink = ip->i_di.di_nlink + diff;

	/* If we are reducing the nlink count, but the new value ends up being
	   bigger than the old one, we must have underflowed. */
	if (diff < 0 && nlink > ip->i_di.di_nlink) {
		if (gfs2_consist_inode(ip))
			gfs2_dinode_print(&ip->i_di);
		return -EIO;
	}

	error = gfs2_meta_inode_buffer(ip, &dibh);
	if (error)
		return error;

	ip->i_di.di_nlink = nlink;
	ip->i_di.di_ctime = get_seconds();
	ip->i_inode.i_nlink = nlink;

	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
	gfs2_dinode_out(&ip->i_di, dibh->b_data);
	brelse(dibh);
	mark_inode_dirty(&ip->i_inode);

	if (ip->i_di.di_nlink == 0) {
		struct gfs2_rgrpd *rgd;
		struct gfs2_holder ri_gh, rg_gh;

		error = gfs2_rindex_hold(sdp, &ri_gh);
		if (error)
			goto out;
		error = -EIO;
		rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
		if (!rgd)
			goto out_norgrp;
		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
		if (error)
			goto out_norgrp;

		gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
		gfs2_glock_dq_uninit(&rg_gh);
out_norgrp:
		gfs2_glock_dq_uninit(&ri_gh);
	}
out:
	return error;
}

struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
	struct qstr qstr;
	gfs2_str2qstr(&qstr, name);
	return gfs2_lookupi(dip, &qstr, 1, NULL);
}


/**
 * gfs2_lookupi - Look up a filename in a directory and return its inode
 * @d_gh: An initialized holder for the directory glock
 * @name: The name of the inode to look for
 * @is_root: If 1, ignore the caller's permissions
 * @i_gh: An uninitialized holder for the new inode glock
 *
 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
 * @is_root is true.
 *
 * Returns: errno
 */

struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
			   int is_root, struct nameidata *nd)
		 
{
	struct super_block *sb = dir->i_sb;
	struct gfs2_inode *dip = GFS2_I(dir);
	struct gfs2_holder d_gh;
	struct gfs2_inum inum;
	unsigned int type;
	int error = 0;
	struct inode *inode = NULL;

	if (!name->len || name->len > GFS2_FNAMESIZE)
		return ERR_PTR(-ENAMETOOLONG);

	if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
	    (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
	     dir == sb->s_root->d_inode)) {
		igrab(dir);
		return dir;
	}

	error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
	if (error)
		return ERR_PTR(error);

	if (!is_root) {
		error = permission(dir, MAY_EXEC, NULL);
		if (error)
			goto out;
	}

	error = gfs2_dir_search(dir, name, &inum, &type);
	if (error)
		goto out;

	inode = gfs2_inode_lookup(sb, &inum, type);

out:
	gfs2_glock_dq_uninit(&d_gh);
	if (error == -ENOENT)
		return NULL;
	return inode;
}

static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
	struct buffer_head *bh;
	struct gfs2_inum_range ir;
	int error;

	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
	if (error)
		return error;
	mutex_lock(&sdp->sd_inum_mutex);

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error) {
		mutex_unlock(&sdp->sd_inum_mutex);
		gfs2_trans_end(sdp);
		return error;
	}

	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (ir.ir_length) {
		*formal_ino = ir.ir_start++;
		ir.ir_length--;
		gfs2_trans_add_bh(ip->i_gl, bh, 1);
		gfs2_inum_range_out(&ir,
				    bh->b_data + sizeof(struct gfs2_dinode));
		brelse(bh);
		mutex_unlock(&sdp->sd_inum_mutex);
		gfs2_trans_end(sdp);
		return 0;
	}

	brelse(bh);

	mutex_unlock(&sdp->sd_inum_mutex);
	gfs2_trans_end(sdp);

	return 1;
}

static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
	struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
	struct gfs2_holder gh;
	struct buffer_head *bh;
	struct gfs2_inum_range ir;
	int error;

	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
	if (error)
		return error;

	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
	if (error)
		goto out;
	mutex_lock(&sdp->sd_inum_mutex);

	error = gfs2_meta_inode_buffer(ip, &bh);
	if (error)
		goto out_end_trans;
	
	gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));

	if (!ir.ir_length) {
		struct buffer_head *m_bh;
		uint64_t x, y;

		error = gfs2_meta_inode_buffer(m_ip, &m_bh);
		if (error)
			goto out_brelse;

		x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
		x = y = be64_to_cpu(x);
		ir.ir_start = x;
		ir.ir_length = GFS2_INUM_QUANTUM;
		x += GFS2_INUM_QUANTUM;
		if (x < y)
			gfs2_consist_inode(m_ip);
		x = cpu_to_be64(x);
		gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
		*(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;

		brelse(m_bh);
	}

	*formal_ino = ir.ir_start++;
	ir.ir_length--;

	gfs2_trans_add_bh(ip->i_gl, bh, 1);
	gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));

 out_brelse:
	brelse(bh);

 out_end_trans:
	mutex_unlock(&sdp->sd_inum_mutex);
	gfs2_trans_end(sdp);

 out:
	gfs2_glock_dq_uninit(&gh);

	return error;
}

static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
{
	int error;

	error = pick_formal_ino_1(sdp, inum);
	if (error <= 0)
		return error;

	error = pick_formal_ino_2(sdp, inum);

	return error;
}

/**
 * create_ok - OK to create a new on-disk inode here?
 * @dip:  Directory in which dinode is to be created
 * @name:  Name of new dinode
 * @mode:
 *
 * Returns: errno
 */

static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
		     unsigned int mode)
{
	int error;

	error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
	if (error)
		return error;

	/*  Don't create entries in an unlinked directory  */
	if (!dip->i_di.di_nlink)
		return -EPERM;

	error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
	switch (error) {
	case -ENOENT:
		error = 0;
		break;
	case 0:
		return -EEXIST;
	default:
		return error;
	}

	if (dip->i_di.di_entries == (uint32_t)-1)
		return -EFBIG;
	if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
		return -EMLINK;

	return 0;
}

static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
			       unsigned int *uid, unsigned int *gid)
{
	if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
	    (dip->i_di.di_mode & S_ISUID) &&
	    dip->i_di.di_uid) {
		if (S_ISDIR(*mode))
			*mode |= S_ISUID;
		else if (dip->i_di.di_uid != current->fsuid)
			*mode &= ~07111;
		*uid = dip->i_di.di_uid;
	} else
		*uid = current->fsuid;

	if (dip->i_di.di_mode & S_ISGID) {
		if (S_ISDIR(*mode))
			*mode |= S_ISGID;
		*gid = dip->i_di.di_gid;
	} else
		*gid = current->fsgid;
}

static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
			u64 *generation)
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	int error;

	gfs2_alloc_get(dip);

	dip->i_alloc.al_requested = RES_DINODE;
	error = gfs2_inplace_reserve(dip);
	if (error)
		goto out;

	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
	if (error)
		goto out_ipreserv;

	inum->no_addr = gfs2_alloc_di(dip, generation);

	gfs2_trans_end(sdp);

out_ipreserv:
	gfs2_inplace_release(dip);

out:
	gfs2_alloc_put(dip);

	return error;
}

/**
 * init_dinode - Fill in a new dinode structure
 * @dip: the directory this inode is being created in
 * @gl: The glock covering the new inode
 * @inum: the inode number
 * @mode: the file permissions
 * @uid:
 * @gid:
 *
 */

static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
			const struct gfs2_inum *inum, unsigned int mode,
			unsigned int uid, unsigned int gid,
			const u64 *generation)
{
	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
	struct gfs2_dinode *di;
	struct buffer_head *dibh;

	dibh = gfs2_meta_new(gl, inum->no_addr);
	gfs2_trans_add_bh(gl, dibh, 1);
	gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
	gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
	di = (struct gfs2_dinode *)dibh->b_data;

	di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
	di->di_num.no_addr = cpu_to_be64(inum->no_addr);
	di->di_mode = cpu_to_be32(mode);
	di->di_uid = cpu_to_be32(uid);
	di->di_gid = cpu_to_be32(gid);
	di->di_nlink = cpu_to_be32(0);
	di->di_size = cpu_to_be64(0);
	di->di_blocks = cpu_to_be64(1);
	di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
	di->di_major = di->di_minor = cpu_to_be32(0);
	di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
	di->di_generation = cpu_to_be64(*generation);
	di->di_flags = cpu_to_be32(0);

	if (S_ISREG(mode)) {
		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
		    gfs2_tune_get(sdp, gt_new_files_jdata))
			di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
		if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
		    gfs2_tune_get(sdp, gt_new_files_directio))
			di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
	} else if (S_ISDIR(mode)) {
		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
					    GFS2_DIF_INHERIT_DIRECTIO);
		di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
					    GFS2_DIF_INHERIT_JDATA);
	}

	di->__pad1 = 0;
	di->di_payload_format = cpu_to_be32(0);
	di->di_height = cpu_to_be32(0);
	di->__pad2 = 0;
	di->__pad3 = 0;
	di->di_depth = cpu_to_be16(0);
	di->di_entries = cpu_to_be32(0);
	memset(&di->__pad4, 0, sizeof(di->__pad4));
	di->di_eattr = cpu_to_be64(0);
	memset(&di->di_reserved, 0, sizeof(di->di_reserved));

	brelse(dibh);
}
{'fraction_non_alphanumeric': 0.14156843877796488, 'fraction_numerical': 0.021469809959105125, 'mean_word_length': 4.323675364174804, 'pattern_counts': {'":': 0, '<': 31, '<?xml version=': 0, '>': 446, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '4843847', 'n_tokens_mistral': 16206, 'n_tokens_neox': 15164, 'n_words': 2947}