/* * 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(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct denode **depp) { 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); } 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. */ if (diroffset == 0 && ldep->de_StartCluster != dirclust) { #ifdef MSDOSFS_DEBUG printf("deget(): \".\" entry at clust %lu != %lu\n", dirclust, ldep->de_StartCluster); #endif ldep->de_StartCluster = dirclust; } nvp->v_type = VDIR; if (ldep->de_StartCluster != MSDOSFSROOT) { error = pcbmap(ldep, 0xffff, 0, &size, 0); if (error == E2BIG) { ldep->de_FileSize = de_cn2off(pmp, size); error = 0; } else { #ifdef MSDOSFS_DEBUG printf("deget(): pcbmap returned %d\n", error); #endif } } } else nvp->v_type = VREG; ldep->de_modrev = init_va_filerev(); *depp = ldep; return (0); }
/* * 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(struct msdosfsmount *pmp, uint32_t dirclust, uint32_t diroffset, struct denode **depp) { int error; extern struct vops msdosfs_vops; struct direntry *direntptr; struct denode *ldep; struct vnode *nvp; struct buf *bp; struct proc *p = curproc; /* XXX */ #ifdef MSDOSFS_DEBUG printf("deget(pmp %08x, dirclust %d, diroffset %x, depp %08x)\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. */ retry: 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_vops, &nvp); if (error) { *depp = 0; return (error); } ldep = malloc(sizeof(*ldep), M_MSDOSFSNODE, M_WAITOK | M_ZERO); lockinit(&ldep->de_lock, PINOD, "denode", 0, 0); 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, p); error = msdosfs_hashins(ldep); if (error) { vput (nvp); if (error == EEXIST) goto retry; return (error); } 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_flag |= VROOT; /* 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_CTime = 0x0000; /* 00:00:00 */ ldep->de_CTimeHundredth = 0; 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) 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. */ uint32_t size; nvp->v_type = VDIR; if (ldep->de_StartCluster != MSDOSFSROOT) { error = pcbmap(ldep, 0xffff, 0, &size, 0); if (error == E2BIG) { ldep->de_FileSize = de_cn2off(pmp, size); error = 0; } else if (error) { printf("deget(): pcbmap returned %d\n", error); return (error); } } } else nvp->v_type = VREG; vref(ldep->de_devvp); *depp = ldep; return (0); }
/* * Truncate the file described by dep to the length specified by length. */ int detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred) { int error; int allerror; u_long eofentry; u_long chaintofree; daddr_t bn; 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)) { #ifdef MSDOSFS_DEBUG printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", dep->de_dirclust, dep->de_diroffset); #endif return (EINVAL); } if (dep->de_FileSize < length) { vnode_pager_setsize(DETOV(dep), length); return deextend(dep, length, cred); } /* * 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, de_clcount(pmp, length) - 1, 0, &eofentry, 0); if (error) { #ifdef MSDOSFS_DEBUG printf("detrunc(): pcbmap fails %d\n", error); #endif return (error); } } fc_purge(dep, de_clcount(pmp, length)); /* * 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, bn, pmp->pm_bpcluster, NOCRED, &bp); if (error) { brelse(bp); #ifdef MSDOSFS_DEBUG printf("detrunc(): bread fails %d\n", error); #endif return (error); } bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); if (flags & IO_SYNC) bwrite(bp); else bdwrite(bp); } } /* * 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; allerror = vtruncbuf(DETOV(dep), cred, length, pmp->pm_bpcluster); #ifdef MSDOSFS_DEBUG if (allerror) printf("detrunc(): vtruncbuf error %d\n", allerror); #endif error = deupdat(dep, !DOINGASYNC((DETOV(dep)))); if (error != 0 && allerror == 0) allerror = error; #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(pmp, chaintofree)) freeclusterchain(pmp, chaintofree); return (allerror); }
/* * 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(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct denode **depp) /* pmp: so we know the maj/min number */ /* dirclust: cluster this dir entry came from */ /* diroffset: index of entry within the cluster */ /* depp: returns the addr of the gotten denode */ { int error; struct direntry *direntptr; struct denode *ldep; 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; ldep = ecalloc(1, sizeof(*ldep)); ldep->de_vnode = NULL; 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; ldep->de_pmp = pmp; ldep->de_devvp = pmp->pm_devvp; ldep->de_refcnt = 1; fc_purge(ldep, 0); /* * 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. */ ldep->de_vnode = (struct vnode *)-1; 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; 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; 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); } } *depp = ldep; return (0); }