<commit_before>/* $FreeBSD$ */
/*	$NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $	*/

/*-
 * Copyright (C) 1994, 1995, 1997 <NAME>.
 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
 * All rights reserved.
 * Original code by <NAME> (<EMAIL>) (see below).
 *
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */
/*-
 * Written by <NAME> (<EMAIL>)
 *
 * You can do anything you want with this software, just don't say you wrote
 * it, and don't remove this notice.
 *
 * This software is provided "as is".
 *
 * The author supplies this software to be publicly redistributed on the
 * understanding that the author is not responsible for the correct
 * functioning of this software in any circumstances and is not liable for
 * any damages caused by this software.
 *
 * October 1992
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/clock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/vnode.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>

#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/direntry.h>
#include <fs/msdosfs/denode.h>
#include <fs/msdosfs/fat.h>
#include <fs/msdosfs/msdosfsmount.h>

static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");

static int
de_vncmpf(struct vnode *vp, void *arg)
{
	struct denode *de;
	uint64_t *a;

	a = arg;
	de = VTODE(vp);
	return (de->de_inode != *a);
}

/*
 * If deget() succeeds it returns with the gotten denode locked().
 *
 * pmp	     - address of msdosfsmount structure of the filesystem containing
 *	       the denode of interest.  The address of
 *	       the msdosfsmount structure are used.
 * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
 *	       diroffset is relative to the beginning of the root directory,
 *	       otherwise it is cluster relative.
 * diroffset - offset past begin of cluster of denode we want
 * depp	     - returns the address of the gotten denode.
 */
int
deget(pmp, dirclust, diroffset, depp)
	struct msdosfsmount *pmp;	/* so we know the maj/min number */
	u_long dirclust;		/* cluster this dir entry came from */
	u_long diroffset;		/* index of entry within the cluster */
	struct denode **depp;		/* returns the addr of the gotten denode */
{
	int error;
	uint64_t inode;
	struct mount *mntp = pmp->pm_mountp;
	struct direntry *direntptr;
	struct denode *ldep;
	struct vnode *nvp, *xvp;
	struct buf *bp;

#ifdef MSDOSFS_DEBUG
	printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
	    pmp, dirclust, diroffset, depp);
#endif

	/*
	 * On FAT32 filesystems, root is a (more or less) normal
	 * directory
	 */
	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
		dirclust = pmp->pm_rootdirblk;

	/*
	 * See if the denode is in the denode cache. Use the location of
	 * the directory entry to compute the hash value. For subdir use
	 * address of "." entry. For root dir (if not FAT32) use cluster
	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
	 *
	 * NOTE: The check for de_refcnt > 0 below insures the denode being
	 * examined does not represent an unlinked but still open file.
	 * These files are not to be accessible even when the directory
	 * entry that represented the file happens to be reused while the
	 * deleted file is still open.
	 */
	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;

	error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
	    de_vncmpf, &inode);
	if (error)
		return (error);
	if (nvp != NULL) {
		*depp = VTODE(nvp);
		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
		return (0);
	}

	/*
	 * Do the malloc before the getnewvnode since doing so afterward
	 * might cause a bogus v_data pointer to get dereferenced
	 * elsewhere if malloc should block.
	 */
	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);

	/*
	 * Directory entry was not in cache, have to create a vnode and
	 * copy it from the passed disk buffer.
	 */
	/* getnewvnode() does a VREF() on the vnode */
	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
	if (error) {
		*depp = NULL;
		free(ldep, M_MSDOSFSNODE);
		return error;
	}
	nvp->v_data = ldep;
	ldep->de_vnode = nvp;
	ldep->de_flag = 0;
	ldep->de_dirclust = dirclust;
	ldep->de_diroffset = diroffset;
	ldep->de_inode = inode;
	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
	fc_purge(ldep, 0);	/* init the fat cache for this denode */
	error = insmntque(nvp, mntp);
	if (error != 0) {
		free(ldep, M_MSDOSFSNODE);
		*depp = NULL;
		return (error);
	}
	error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
	    de_vncmpf, &inode);
	if (error) {
		*depp = NULL;
		return (error);
	}
	if (xvp != NULL) {
		*depp = xvp->v_data;
		return (0);
	}

	ldep->de_pmp = pmp;
	ldep->de_refcnt = 1;
	/*
	 * Copy the directory entry into the denode area of the vnode.
	 */
	if ((dirclust == MSDOSFSROOT
	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
	    && diroffset == MSDOSFSROOT_OFS) {
		/*
		 * Directory entry for the root directory. There isn't one,
		 * so we manufacture one. We should probably rummage
		 * through the root directory and find a label entry (if it
		 * exists), and then use the time and date from that entry
		 * as the time and date for the root denode.
		 */
		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */

		ldep->de_Attributes = ATTR_DIRECTORY;
		ldep->de_LowerCase = 0;
		if (FAT32(pmp))
			ldep->de_StartCluster = pmp->pm_rootdirblk;
			/* de_FileSize will be filled in further down */
		else {
			ldep->de_StartCluster = MSDOSFSROOT;
			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
		}
		/*
		 * fill in time and date so that fattime2timespec() doesn't
		 * spit up when called from msdosfs_getattr() with root
		 * denode
		 */
		ldep->de_CHun = 0;
		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
		    | (1 << DD_DAY_SHIFT);
		/* Jan 1, 1980	 */
		ldep->de_ADate = ldep->de_CDate;
		ldep->de_MTime = ldep->de_CTime;
		ldep->de_MDate = ldep->de_CDate;
		/* leave the other fields as garbage */
	} else {
		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
		if (error) {
			/*
			 * The denode does not contain anything useful, so
			 * it would be wrong to leave it on its hash chain.
			 * Arrange for vput() to just forget about it.
			 */
			ldep->de_Name[0] = SLOT_DELETED;

			vput(nvp);
			*depp = NULL;
			return (error);
		}
		DE_INTERNALIZE(ldep, direntptr);
		brelse(bp);
	}

	/*
	 * Fill in a few fields of the vnode and finish filling in the
	 * denode.  Then return the address of the found denode.
	 */
	if (ldep->de_Attributes & ATTR_DIRECTORY) {
		/*
		 * Since DOS directory entries that describe directories
		 * have 0 in the filesize field, we take this opportunity
		 * to find out the length of the directory and plug it into
		 * the denode structure.
		 */
		u_long size;

		/*
		 * XXX it sometimes happens that the "." entry has cluster
		 * number 0 when it shouldn't.  Use the actual cluster number
		 * instead of what is written in directory entry.<commit_msg>Ignore the return value of DE_INTERNALIZE().<commit_after>/* $FreeBSD$ */
/*	$NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $	*/

/*-
 * Copyright (C) 1994, 1995, 1997 <NAME>.
 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
 * All rights reserved.
 * Original code by <NAME> (<EMAIL>) (see below).
 *
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */
/*-
 * Written by <NAME> (<EMAIL>)
 *
 * You can do anything you want with this software, just don't say you wrote
 * it, and don't remove this notice.
 *
 * This software is provided "as is".
 *
 * The author supplies this software to be publicly redistributed on the
 * understanding that the author is not responsible for the correct
 * functioning of this software in any circumstances and is not liable for
 * any damages caused by this software.
 *
 * October 1992
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/clock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/vnode.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>

#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/direntry.h>
#include <fs/msdosfs/denode.h>
#include <fs/msdosfs/fat.h>
#include <fs/msdosfs/msdosfsmount.h>

static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");

static int
de_vncmpf(struct vnode *vp, void *arg)
{
	struct denode *de;
	uint64_t *a;

	a = arg;
	de = VTODE(vp);
	return (de->de_inode != *a);
}

/*
 * If deget() succeeds it returns with the gotten denode locked().
 *
 * pmp	     - address of msdosfsmount structure of the filesystem containing
 *	       the denode of interest.  The address of
 *	       the msdosfsmount structure are used.
 * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
 *	       diroffset is relative to the beginning of the root directory,
 *	       otherwise it is cluster relative.
 * diroffset - offset past begin of cluster of denode we want
 * depp	     - returns the address of the gotten denode.
 */
int
deget(pmp, dirclust, diroffset, depp)
	struct msdosfsmount *pmp;	/* so we know the maj/min number */
	u_long dirclust;		/* cluster this dir entry came from */
	u_long diroffset;		/* index of entry within the cluster */
	struct denode **depp;		/* returns the addr of the gotten denode */
{
	int error;
	uint64_t inode;
	struct mount *mntp = pmp->pm_mountp;
	struct direntry *direntptr;
	struct denode *ldep;
	struct vnode *nvp, *xvp;
	struct buf *bp;

#ifdef MSDOSFS_DEBUG
	printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
	    pmp, dirclust, diroffset, depp);
#endif

	/*
	 * On FAT32 filesystems, root is a (more or less) normal
	 * directory
	 */
	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
		dirclust = pmp->pm_rootdirblk;

	/*
	 * See if the denode is in the denode cache. Use the location of
	 * the directory entry to compute the hash value. For subdir use
	 * address of "." entry. For root dir (if not FAT32) use cluster
	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
	 *
	 * NOTE: The check for de_refcnt > 0 below insures the denode being
	 * examined does not represent an unlinked but still open file.
	 * These files are not to be accessible even when the directory
	 * entry that represented the file happens to be reused while the
	 * deleted file is still open.
	 */
	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;

	error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
	    de_vncmpf, &inode);
	if (error)
		return (error);
	if (nvp != NULL) {
		*depp = VTODE(nvp);
		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
		return (0);
	}

	/*
	 * Do the malloc before the getnewvnode since doing so afterward
	 * might cause a bogus v_data pointer to get dereferenced
	 * elsewhere if malloc should block.
	 */
	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);

	/*
	 * Directory entry was not in cache, have to create a vnode and
	 * copy it from the passed disk buffer.
	 */
	/* getnewvnode() does a VREF() on the vnode */
	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
	if (error) {
		*depp = NULL;
		free(ldep, M_MSDOSFSNODE);
		return error;
	}
	nvp->v_data = ldep;
	ldep->de_vnode = nvp;
	ldep->de_flag = 0;
	ldep->de_dirclust = dirclust;
	ldep->de_diroffset = diroffset;
	ldep->de_inode = inode;
	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
	fc_purge(ldep, 0);	/* init the fat cache for this denode */
	error = insmntque(nvp, mntp);
	if (error != 0) {
		free(ldep, M_MSDOSFSNODE);
		*depp = NULL;
		return (error);
	}
	error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
	    de_vncmpf, &inode);
	if (error) {
		*depp = NULL;
		return (error);
	}
	if (xvp != NULL) {
		*depp = xvp->v_data;
		return (0);
	}

	ldep->de_pmp = pmp;
	ldep->de_refcnt = 1;
	/*
	 * Copy the directory entry into the denode area of the vnode.
	 */
	if ((dirclust == MSDOSFSROOT
	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
	    && diroffset == MSDOSFSROOT_OFS) {
		/*
		 * Directory entry for the root directory. There isn't one,
		 * so we manufacture one. We should probably rummage
		 * through the root directory and find a label entry (if it
		 * exists), and then use the time and date from that entry
		 * as the time and date for the root denode.
		 */
		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */

		ldep->de_Attributes = ATTR_DIRECTORY;
		ldep->de_LowerCase = 0;
		if (FAT32(pmp))
			ldep->de_StartCluster = pmp->pm_rootdirblk;
			/* de_FileSize will be filled in further down */
		else {
			ldep->de_StartCluster = MSDOSFSROOT;
			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
		}
		/*
		 * fill in time and date so that fattime2timespec() doesn't
		 * spit up when called from msdosfs_getattr() with root
		 * denode
		 */
		ldep->de_CHun = 0;
		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
		    | (1 << DD_DAY_SHIFT);
		/* Jan 1, 1980	 */
		ldep->de_ADate = ldep->de_CDate;
		ldep->de_MTime = ldep->de_CTime;
		ldep->de_MDate = ldep->de_CDate;
		/* leave the other fields as garbage */
	} else {
		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
		if (error) {
			/*
			 * The denode does not contain anything useful, so
			 * it would be wrong to leave it on its hash chain.
			 * Arrange for vput() to just forget about it.
			 */
			ldep->de_Name[0] = SLOT_DELETED;

			vput(nvp);
			*depp = NULL;
			return (error);
		}
		(void)DE_INTERNALIZE(ldep, direntptr);
		brelse(bp);
	}

	/*
	 * Fill in a few fields of the vnode and finish filling in the
	 * denode.  Then return the address of the found denode.
	 */
	if (ldep->de_Attributes & ATTR_DIRECTORY) {
		/*
		 * Since DOS directory entries that describe directories
		 * have 0 in the filesize field, we take this opportunity
		 * to find out the length of the directory and plug it into
		 * the denode structure.
		 */
		u_long size;

		/*
		 * XXX it sometimes happens that the "." entry has cluster
		 * number 0 when it shouldn't.  Use the actual cluster number
		 * instead of what is written in directory entry.
{'fraction_non_alphanumeric': 0.10287782181630191, 'fraction_numerical': 0.011258544431041415, 'mean_word_length': 3.4836466649497813, 'pattern_counts': {'":': 0, '<': 55, '<?xml version=': 0, '>': 117, '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': '3287601', 'n_tokens_mistral': 6498, 'n_tokens_neox': 5865, 'n_words': 2150}