/* $NetBSD: msdosfs_denode.c,v 1.22.8.2 2007/10/14 11:48:28 yamt Exp $ */ /*- * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. * Copyright (C) 1994, 1995, 1997 TooLs GmbH. * All rights reserved. * Original code by Paul Popelka (paulp@uts.amdahl.com) (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 Paul Popelka (paulp@uts.amdahl.com) * * 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 __KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.22.8.2 2007/10/14 11:48:28 yamt Exp $"); #include #include #include #include #include #include #include #include #include /* defines "time" */ #include #include #include #include #include #include #include #include #include LIST_HEAD(ihashhead, denode) *dehashtbl; u_long dehash; /* size of hash table - 1 */ #define DEHASH(dev, dcl, doff) \ (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash) struct simplelock msdosfs_ihash_slock; struct pool msdosfs_denode_pool; extern int prtactive; static const struct genfs_ops msdosfs_genfsops = { .gop_size = genfs_size, .gop_alloc = msdosfs_gop_alloc, .gop_write = genfs_gop_write, .gop_markupdate = msdosfs_gop_markupdate, }; static struct denode *msdosfs_hashget(dev_t, u_long, u_long); static void msdosfs_hashins(struct denode *); static void msdosfs_hashrem(struct denode *); MALLOC_DECLARE(M_MSDOSFSFAT); void msdosfs_init() { malloc_type_attach(M_MSDOSFSMNT); malloc_type_attach(M_MSDOSFSFAT); malloc_type_attach(M_MSDOSFSTMP); pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0, "msdosnopl", &pool_allocator_nointr, IPL_NONE); dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT, M_WAITOK, &dehash); simple_lock_init(&msdosfs_ihash_slock); } /* * Reinitialize inode hash table. */ void msdosfs_reinit() { struct denode *dep; struct ihashhead *oldhash, *hash; u_long oldmask, mask, val; int i; hash = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT, M_WAITOK, &mask); simple_lock(&msdosfs_ihash_slock); oldhash = dehashtbl; oldmask = dehash; dehashtbl = hash; dehash = mask; for (i = 0; i <= oldmask; i++) { while ((dep = LIST_FIRST(&oldhash[i])) != NULL) { LIST_REMOVE(dep, de_hash); val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); LIST_INSERT_HEAD(&hash[val], dep, de_hash); } } simple_unlock(&msdosfs_ihash_slock); hashdone(oldhash, M_MSDOSFSMNT); } void msdosfs_done() { hashdone(dehashtbl, M_MSDOSFSMNT); pool_destroy(&msdosfs_denode_pool); malloc_type_detach(M_MSDOSFSTMP); malloc_type_detach(M_MSDOSFSFAT); malloc_type_detach(M_MSDOSFSMNT); } static struct denode * msdosfs_hashget(dev, dirclust, diroff) dev_t dev; u_long dirclust; u_long diroff; { struct denode *dep; struct vnode *vp; loop: simple_lock(&msdosfs_ihash_slock); LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) { if (dirclust == dep->de_dirclust && diroff == dep->de_diroffset && dev == dep->de_dev && dep->de_refcnt != 0) { vp = DETOV(dep); simple_lock(&vp->v_interlock); simple_unlock(&msdosfs_ihash_slock); if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) goto loop; return (dep); } } simple_unlock(&msdosfs_ihash_slock); return (NULL); } static void msdosfs_hashins(dep) struct denode *dep; { struct ihashhead *depp; int val; simple_lock(&msdosfs_ihash_slock); val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); depp = &dehashtbl[val]; LIST_INSERT_HEAD(depp, dep, de_hash); simple_unlock(&msdosfs_ihash_slock); } static void msdosfs_hashrem(dep) struct denode *dep; { simple_lock(&msdosfs_ihash_slock); LIST_REMOVE(dep, de_hash); simple_unlock(&msdosfs_ihash_slock); } /* * If deget() succeeds it returns with the gotten denode locked(). * * pmp - address of msdosfsmount structure of the filesystem containing * the denode of interest. The pm_dev field and 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; extern int (**msdosfs_vnodeop_p)(void *); struct direntry *direntptr; struct denode *ldep; struct vnode *nvp; 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. */ ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset); if (ldep) { *depp = ldep; return (0); } /* * 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(VT_MSDOSFS, pmp->pm_mountp, msdosfs_vnodeop_p, &nvp); if (error) { *depp = 0; return (error); } ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK); memset(ldep, 0, sizeof *ldep); nvp->v_data = ldep; ldep->de_vnode = nvp; ldep->de_flag = 0; ldep->de_devvp = 0; ldep->de_lockf = 0; ldep->de_dev = pmp->pm_dev; ldep->de_dirclust = dirclust; ldep->de_diroffset = diroffset; fc_purge(ldep, 0); /* init the fat cache for this denode */ /* * Insert the denode into the hash queue and lock the denode so it * can't be accessed until we've read it in and have done what we * need to it. */ vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY); genfs_node_init(nvp, &msdosfs_genfsops); msdosfs_hashins(ldep); ldep->de_pmp = pmp; ldep->de_devvp = pmp->pm_devvp; 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; 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 * pmp->pm_BytesPerSec; } /* * fill in time and date so that dos2unixtime() 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) { ldep->de_devvp = NULL; ldep->de_Name[0] = SLOT_DELETED; vput(nvp); return (error); } DE_INTERNALIZE(ldep, direntptr); brelse(bp, 0); } /* * 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; nvp->v_type = VDIR; if (ldep->de_StartCluster != MSDOSFSROOT) { error = pcbmap(ldep, CLUST_END, 0, &size, 0); if (error == E2BIG) { ldep->de_FileSize = de_cn2off(pmp, size); error = 0; } else printf("deget(): pcbmap returned %d\n", error); } } else nvp->v_type = VREG; VREF(ldep->de_devvp); *depp = ldep; uvm_vnp_setsize(nvp, ldep->de_FileSize); return (0); } int deupdat(dep, waitfor) struct denode *dep; int waitfor; { return (msdosfs_update(DETOV(dep), NULL, NULL, waitfor ? UPDATE_WAIT : 0)); } /* * Truncate the file described by dep to the length specified by length. */ int detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred, struct lwp *l) { int error; int allerror; u_long eofentry; u_long chaintofree = 0; daddr_t bn, lastblock; int boff; int isadir = dep->de_Attributes & ATTR_DIRECTORY; struct buf *bp; struct msdosfsmount *pmp = dep->de_pmp; #ifdef MSDOSFS_DEBUG printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); #endif /* * Disallow attempts to truncate the root directory since it is of * fixed size. That's just the way dos filesystems are. We use * the VROOT bit in the vnode because checking for the directory * bit and a startcluster of 0 in the denode is not adequate to * recognize the root directory at this point in a file or * directory's life. */ if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", dep->de_dirclust, dep->de_diroffset); return (EINVAL); } uvm_vnp_setsize(DETOV(dep), length); if (dep->de_FileSize < length) return (deextend(dep, length, cred)); lastblock = de_clcount(pmp, length) - 1; /* * If the desired length is 0 then remember the starting cluster of * the file and set the StartCluster field in the directory entry * to 0. If the desired length is not zero, then get the number of * the last cluster in the shortened file. Then get the number of * the first cluster in the part of the file that is to be freed. * Then set the next cluster pointer in the last cluster of the * file to CLUST_EOFE. */ if (length == 0) { chaintofree = dep->de_StartCluster; dep->de_StartCluster = 0; eofentry = ~0; } else { error = pcbmap(dep, lastblock, 0, &eofentry, 0); if (error) { #ifdef MSDOSFS_DEBUG printf("detrunc(): pcbmap fails %d\n", error); #endif return (error); } } fc_purge(dep, lastblock + 1); /* * If the new length is not a multiple of the cluster size then we * must zero the tail end of the new last cluster in case it * becomes part of the file again because of a seek. */ if ((boff = length & pmp->pm_crbomask) != 0) { if (isadir) { bn = cntobn(pmp, eofentry); error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), pmp->pm_bpcluster, NOCRED, &bp); if (error) { brelse(bp, 0); #ifdef MSDOSFS_DEBUG printf("detrunc(): bread fails %d\n", error); #endif return (error); } memset((char *)bp->b_data + boff, 0, pmp->pm_bpcluster - boff); if (flags & IO_SYNC) bwrite(bp); else bdwrite(bp); } else { uvm_vnp_zerorange(DETOV(dep), length, pmp->pm_bpcluster - boff); } } /* * Write out the updated directory entry. Even if the update fails * we free the trailing clusters. */ dep->de_FileSize = length; if (!isadir) dep->de_flag |= DE_UPDATE|DE_MODIFIED; vtruncbuf(DETOV(dep), lastblock + 1, 0, 0); allerror = deupdat(dep, 1); #ifdef MSDOSFS_DEBUG printf("detrunc(): allerror %d, eofentry %lu\n", allerror, eofentry); #endif /* * If we need to break the cluster chain for the file then do it * now. */ if (eofentry != ~0) { error = fatentry(FAT_GET_AND_SET, pmp, eofentry, &chaintofree, CLUST_EOFE); if (error) { #ifdef MSDOSFS_DEBUG printf("detrunc(): fatentry errors %d\n", error); #endif return (error); } fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), eofentry); } /* * Now free the clusters removed from the file because of the * truncation. */ if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask)) freeclusterchain(pmp, chaintofree); return (allerror); } /* * Extend the file described by dep to length specified by length. */ int deextend(dep, length, cred) struct denode *dep; u_long length; kauth_cred_t cred; { struct msdosfsmount *pmp = dep->de_pmp; u_long count, osize; int error; /* * The root of a DOS filesystem cannot be extended. */ if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) return (EINVAL); /* * Directories cannot be extended. */ if (dep->de_Attributes & ATTR_DIRECTORY) return (EISDIR); if (length <= dep->de_FileSize) panic("deextend: file too large"); /* * Compute the number of clusters to allocate. */ count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); if (count > 0) { if (count > pmp->pm_freeclustercount) return (ENOSPC); error = extendfile(dep, count, NULL, NULL, DE_CLEAR); if (error) { /* truncate the added clusters away again */ (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); return (error); } } osize = dep->de_FileSize; dep->de_FileSize = length; uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize); dep->de_flag |= DE_UPDATE|DE_MODIFIED; uvm_vnp_zerorange(DETOV(dep), (off_t)osize, (size_t)(dep->de_FileSize - osize)); return (deupdat(dep, 1)); } /* * Move a denode to its correct hash queue after the file it represents has * been moved to a new directory. */ void reinsert(dep) struct denode *dep; { /* * Fix up the denode cache. If the denode is for a directory, * there is nothing to do since the hash is based on the starting * cluster of the directory file and that hasn't changed. If for a * file the hash is based on the location of the directory entry, * so we must remove it from the cache and re-enter it with the * hash based on the new location of the directory entry. */ if (dep->de_Attributes & ATTR_DIRECTORY) return; msdosfs_hashrem(dep); msdosfs_hashins(dep); } int msdosfs_reclaim(v) void *v; { struct vop_reclaim_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(vp); #ifdef MSDOSFS_DEBUG printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", dep, dep->de_Name, dep->de_refcnt); #endif if (prtactive && vp->v_usecount != 0) vprint("msdosfs_reclaim(): pushing active", vp); /* * Remove the denode from its hash chain. */ msdosfs_hashrem(dep); /* * Purge old data structures associated with the denode. */ cache_purge(vp); if (dep->de_devvp) { vrele(dep->de_devvp); dep->de_devvp = 0; } #if 0 /* XXX */ dep->de_flag = 0; #endif genfs_node_destroy(vp); pool_put(&msdosfs_denode_pool, dep); vp->v_data = NULL; return (0); } int msdosfs_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct lwp *a_l; } */ *ap = v; struct lwp *l = ap->a_l; struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(vp); int error = 0; #ifdef MSDOSFS_DEBUG printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); #endif if (prtactive && vp->v_usecount != 0) vprint("msdosfs_inactive(): pushing active", vp); /* * Get rid of denodes related to stale file handles. */ if (dep->de_Name[0] == SLOT_DELETED) goto out; /* * If the file has been deleted and it is on a read/write * filesystem, then truncate the file, and mark the directory slot * as empty. (This may not be necessary for the dos filesystem.) */ #ifdef MSDOSFS_DEBUG printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n", dep, dep->de_refcnt, vp->v_mount->mnt_flag, (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : ""); #endif if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { if (dep->de_FileSize != 0) { error = detrunc(dep, (u_long)0, 0, NOCRED, NULL); } dep->de_Name[0] = SLOT_DELETED; } deupdat(dep, 0); out: VOP_UNLOCK(vp, 0); /* * If we are done with the denode, reclaim it * so that it can be reused immediately. */ #ifdef MSDOSFS_DEBUG printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, dep->de_Name[0]); #endif if (dep->de_Name[0] == SLOT_DELETED) vrecycle(vp, (struct simplelock *)0, l); return (error); } int msdosfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, kauth_cred_t cred) { return 0; } void msdosfs_gop_markupdate(struct vnode *vp, int flags) { u_long mask = 0; if ((flags & GOP_UPDATE_ACCESSED) != 0) { mask = DE_ACCESS; } if ((flags & GOP_UPDATE_MODIFIED) != 0) { mask |= DE_UPDATE; } if (mask) { struct denode *dep = VTODE(vp); dep->de_flag |= mask; } }