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IABSD.fr/src/sys/msdosfs/msdosfs_vnops.c
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- sys/msdosfs/msdosfs_vnops.c
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/* $OpenBSD: msdosfs_vnops.c,v 1.134 2020/06/11 09:18:43 mpi Exp $ */ /* $NetBSD: msdosfs_vnops.c,v 1.63 1997/10/17 11:24:19 ws Exp $ */ /*- * Copyright (C) 2005 Thomas Wang. * 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 <sys/param.h> #include <sys/systm.h> #include <sys/namei.h> #include <sys/resourcevar.h> /* defines plimit structure in proc struct */ #include <sys/fcntl.h> /* define FWRITE ... */ #include <sys/file.h> #include <sys/stat.h> #include <sys/buf.h> #include <sys/proc.h> #include <sys/mount.h> #include <sys/vnode.h> #include <sys/lock.h> #include <sys/signalvar.h> #include <sys/specdev.h> /* XXX */ /* defines v_rdev */ #include <sys/malloc.h> #include <sys/pool.h> #include <sys/dirent.h> /* defines dirent structure */ #include <sys/lockf.h> #include <sys/poll.h> #include <sys/unistd.h> #include <msdosfs/bpb.h> #include <msdosfs/direntry.h> #include <msdosfs/denode.h> #include <msdosfs/msdosfsmount.h> #include <msdosfs/fat.h> static uint32_t fileidhash(uint64_t); int msdosfs_bmaparray(struct vnode *, uint32_t, daddr_t *, int *); int msdosfs_kqfilter(void *); int filt_msdosfsread(struct knote *, long); int filt_msdosfswrite(struct knote *, long); int filt_msdosfsvnode(struct knote *, long); void filt_msdosfsdetach(struct knote *); /* * Some general notes: * * In the ufs filesystem the inodes, superblocks, and indirect blocks are * read/written using the vnode for the filesystem. Blocks that represent * the contents of a file are read/written using the vnode for the file * (including directories when they are read/written as files). This * presents problems for the dos filesystem because data that should be in * an inode (if dos had them) resides in the directory itself. Since we * must update directory entries without the benefit of having the vnode * for the directory we must use the vnode for the filesystem. This means * that when a directory is actually read/written (via read, write, or * readdir, or seek) we must use the vnode for the filesystem instead of * the vnode for the directory as would happen in ufs. This is to insure we * retrieve the correct block from the buffer cache since the hash value is * based upon the vnode address and the desired block number. */ /* * Create a regular file. On entry the directory to contain the file being * created is locked. We must release before we return. We must also free * the pathname buffer pointed at by cnp->cn_pnbuf, always on error, or * only if the SAVESTART bit in cn_flags is clear on success. */ int msdosfs_create(void *v) { struct vop_create_args *ap = v; struct componentname *cnp = ap->a_cnp; struct denode ndirent; struct denode *dep; struct denode *pdep = VTODE(ap->a_dvp); int error; struct timespec ts; #ifdef MSDOSFS_DEBUG printf("msdosfs_create(cnp %p, vap %p\n", cnp, ap->a_vap); #endif /* * If this is the root directory and there is no space left we * can't do anything. This is because the root directory can not * change size. */ if (pdep->de_StartCluster == MSDOSFSROOT && pdep->de_fndoffset >= pdep->de_FileSize) { error = ENOSPC; goto bad; } /* * Create a directory entry for the file, then call createde() to * have it installed. NOTE: DOS files are always executable. We * use the absence of the owner write bit to make the file * readonly. */ #ifdef DIAGNOSTIC if ((cnp->cn_flags & HASBUF) == 0) panic("msdosfs_create: no name"); #endif bzero(&ndirent, sizeof(ndirent)); if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) goto bad; ndirent.de_Attributes = (ap->a_vap->va_mode & VWRITE) ? ATTR_ARCHIVE : ATTR_ARCHIVE | ATTR_READONLY; ndirent.de_StartCluster = 0; ndirent.de_FileSize = 0; ndirent.de_dev = pdep->de_dev; ndirent.de_devvp = pdep->de_devvp; ndirent.de_pmp = pdep->de_pmp; ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; getnanotime(&ts); DETIMES(&ndirent, &ts, &ts, &ts); if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) goto bad; if ((cnp->cn_flags & SAVESTART) == 0) pool_put(&namei_pool, cnp->cn_pnbuf); VN_KNOTE(ap->a_dvp, NOTE_WRITE); *ap->a_vpp = DETOV(dep); return (0); bad: pool_put(&namei_pool, cnp->cn_pnbuf); return (error); } int msdosfs_mknod(void *v) { struct vop_mknod_args *ap = v; pool_put(&namei_pool, ap->a_cnp->cn_pnbuf); VN_KNOTE(ap->a_dvp, NOTE_WRITE); return (EINVAL); } int msdosfs_open(void *v) { return (0); } int msdosfs_close(void *v) { struct vop_close_args *ap = v; struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(vp); struct timespec ts; if (vp->v_usecount > 1 && !VOP_ISLOCKED(vp)) { getnanotime(&ts); DETIMES(dep, &ts, &ts, &ts); } return (0); } int msdosfs_access(void *v) { struct vop_access_args *ap = v; struct denode *dep = VTODE(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; mode_t dosmode; dosmode = (S_IRUSR | S_IRGRP | S_IROTH); if ((dep->de_Attributes & ATTR_READONLY) == 0) dosmode |= (S_IWUSR | S_IWGRP | S_IWOTH); if (dep->de_Attributes & ATTR_DIRECTORY) dosmode |= (S_IXUSR | S_IXGRP | S_IXOTH); dosmode &= pmp->pm_mask; return (vaccess(ap->a_vp->v_type, dosmode, pmp->pm_uid, pmp->pm_gid, ap->a_mode, ap->a_cred)); } int msdosfs_getattr(void *v) { struct vop_getattr_args *ap = v; struct denode *dep = VTODE(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; struct vattr *vap = ap->a_vap; struct timespec ts; uint32_t fileid; getnanotime(&ts); DETIMES(dep, &ts, &ts, &ts); vap->va_fsid = dep->de_dev; /* * The following computation of the fileid must be the same as * that used in msdosfs_readdir() to compute d_fileno. If not, * pwd doesn't work. * * We now use the starting cluster number as the fileid/fileno. * This works for both files and directories (including the root * directory, on FAT32). Even on FAT32, this will at most be a * 28-bit number, as the high 4 bits of FAT32 cluster numbers * are reserved. * * However, we do need to do something for 0-length files, which * will not have a starting cluster number. * * These files cannot be directories, since (except for /, which * is special-cased anyway) directories contain entries for . and * .., so must have non-zero length. * * In this case, we just create a non-cryptographic hash of the * original fileid calculation, and set the top bit. * * This algorithm has the benefit that all directories, and all * non-zero-length files, will have fileids that are persistent * across mounts and reboots, and that cannot collide (as long * as the filesystem is not corrupt). Zero-length files will * have fileids that are persistent, but that may collide. We * will just have to live with that. */ fileid = dep->de_StartCluster; if (dep->de_Attributes & ATTR_DIRECTORY) { /* Special-case root */ if (dep->de_StartCluster == MSDOSFSROOT) fileid = FAT32(pmp) ? pmp->pm_rootdirblk : 1; } else { if (dep->de_FileSize == 0) { uint32_t dirsperblk; uint64_t fileid64; dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); fileid64 = (dep->de_dirclust == MSDOSFSROOT) ? roottobn(pmp, 0) : cntobn(pmp, dep->de_dirclust); fileid64 *= dirsperblk; fileid64 += dep->de_diroffset / sizeof(struct direntry); fileid = fileidhash(fileid64); } } vap->va_fileid = fileid; vap->va_mode = (S_IRUSR|S_IRGRP|S_IROTH); if ((dep->de_Attributes & ATTR_READONLY) == 0) vap->va_mode |= (S_IWUSR|S_IWGRP|S_IWOTH); if (dep->de_Attributes & ATTR_DIRECTORY) { vap->va_mode |= S_IFDIR; vap->va_mode |= (vap->va_mode & S_IRUSR) ? S_IXUSR : 0; vap->va_mode |= (vap->va_mode & S_IRGRP) ? S_IXGRP : 0; vap->va_mode |= (vap->va_mode & S_IROTH) ? S_IXOTH : 0; } vap->va_mode &= dep->de_pmp->pm_mask; vap->va_nlink = 1; vap->va_gid = dep->de_pmp->pm_gid; vap->va_uid = dep->de_pmp->pm_uid; vap->va_rdev = 0; vap->va_size = dep->de_FileSize; dos2unixtime(dep->de_MDate, dep->de_MTime, 0, &vap->va_mtime); if (dep->de_pmp->pm_flags & MSDOSFSMNT_LONGNAME) { dos2unixtime(dep->de_ADate, 0, 0, &vap->va_atime); dos2unixtime(dep->de_CDate, dep->de_CTime, dep->de_CTimeHundredth, &vap->va_ctime); } else { vap->va_atime = vap->va_mtime; vap->va_ctime = vap->va_mtime; } vap->va_flags = 0; if ((dep->de_Attributes & ATTR_ARCHIVE) == 0) vap->va_flags |= SF_ARCHIVED; vap->va_gen = 0; vap->va_blocksize = dep->de_pmp->pm_bpcluster; vap->va_bytes = (dep->de_FileSize + dep->de_pmp->pm_crbomask) & ~(dep->de_pmp->pm_crbomask); vap->va_type = ap->a_vp->v_type; return (0); } int msdosfs_setattr(void *v) { struct vop_setattr_args *ap = v; struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; struct vattr *vap = ap->a_vap; struct ucred *cred = ap->a_cred; int error = 0; #ifdef MSDOSFS_DEBUG printf("msdosfs_setattr(): vp %p, vap %p, cred %p, p %p\n", ap->a_vp, vap, cred, ap->a_p); #endif if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || (vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { #ifdef MSDOSFS_DEBUG printf("msdosfs_setattr(): returning EINVAL\n"); printf(" va_type %d, va_nlink %x, va_fsid %ld, " "va_fileid %llx\n", vap->va_type, vap->va_nlink, vap->va_fsid, (unsigned long long)vap->va_fileid); printf(" va_blocksize %lx, va_rdev %x, va_bytes %llx, " "va_gen %lx\n", vap->va_blocksize, (unsigned int)vap->va_rdev, (unsigned long long)vap->va_bytes, vap->va_gen); #endif return (EINVAL); } if (vap->va_flags != VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EINVAL); if (cred->cr_uid != pmp->pm_uid) { error = suser_ucred(cred); if (error) return (error); } /* * We are very inconsistent about handling unsupported * attributes. We ignored the access time and the * read and execute bits. We were strict for the other * attributes. * * Here we are strict, stricter than ufs in not allowing * users to attempt to set SF_SETTABLE bits or anyone to * set unsupported bits. However, we ignore attempts to * set ATTR_ARCHIVE for directories `cp -pr' from a more * sensible filesystem attempts it a lot. */ if (vap->va_flags & SF_SETTABLE) { error = suser_ucred(cred); if (error) return (error); } if (vap->va_flags & ~SF_ARCHIVED) return EOPNOTSUPP; if (vap->va_flags & SF_ARCHIVED) dep->de_Attributes &= ~ATTR_ARCHIVE; else if (!(dep->de_Attributes & ATTR_DIRECTORY)) dep->de_Attributes |= ATTR_ARCHIVE; dep->de_flag |= DE_MODIFIED; } if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { uid_t uid; gid_t gid; if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EINVAL); uid = vap->va_uid; if (uid == (uid_t)VNOVAL) uid = pmp->pm_uid; gid = vap->va_gid; if (gid == (gid_t)VNOVAL) gid = pmp->pm_gid; if (cred->cr_uid != pmp->pm_uid || uid != pmp->pm_uid || (gid != pmp->pm_gid && !groupmember(gid, cred))) { error = suser_ucred(cred); if (error) return (error); } if (uid != pmp->pm_uid || gid != pmp->pm_gid) return EINVAL; } if (vap->va_size != VNOVAL) { switch (vp->v_type) { case VDIR: return (EISDIR); case VREG: /* * Truncation is only supported for regular files, * Disallow it if the filesystem is read-only. */ if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EINVAL); break; default: /* * According to POSIX, the result is unspecified * for file types other than regular files, * directories and shared memory objects. We * don't support any file types except regular * files and directories in this file system, so * this (default) case is unreachable and can do * anything. Keep falling through to detrunc() * for now. */ break; } error = detrunc(dep, vap->va_size, 0, cred, ap->a_p); if (error) return error; } if ((vap->va_vaflags & VA_UTIMES_CHANGE) || vap->va_atime.tv_nsec != VNOVAL || vap->va_mtime.tv_nsec != VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EINVAL); if (cred->cr_uid != pmp->pm_uid && (error = suser_ucred(cred)) && ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || (error = VOP_ACCESS(ap->a_vp, VWRITE, cred, ap->a_p)))) return (error); if (vp->v_type != VDIR) { if ((pmp->pm_flags & MSDOSFSMNT_NOWIN95) == 0 && vap->va_atime.tv_nsec != VNOVAL) { dep->de_flag &= ~DE_ACCESS; unix2dostime(&vap->va_atime, &dep->de_ADate, NULL, NULL); } if (vap->va_mtime.tv_nsec != VNOVAL) { dep->de_flag &= ~DE_UPDATE; unix2dostime(&vap->va_mtime, &dep->de_MDate, &dep->de_MTime, NULL); } dep->de_Attributes |= ATTR_ARCHIVE; dep->de_flag |= DE_MODIFIED; } } /* * DOS files only have the ability to have their writability * attribute set, so we use the owner write bit to set the readonly * attribute. */ if (vap->va_mode != (mode_t)VNOVAL) { if (vp->v_mount->mnt_flag & MNT_RDONLY) return (EINVAL); if (cred->cr_uid != pmp->pm_uid) { error = suser_ucred(cred); if (error) return (error); } if (vp->v_type != VDIR) { /* We ignore the read and execute bits. */ if (vap->va_mode & VWRITE) dep->de_Attributes &= ~ATTR_READONLY; else dep->de_Attributes |= ATTR_READONLY; dep->de_Attributes |= ATTR_ARCHIVE; dep->de_flag |= DE_MODIFIED; } } VN_KNOTE(ap->a_vp, NOTE_ATTRIB); return (deupdat(dep, 1)); } int msdosfs_read(void *v) { struct vop_read_args *ap = v; struct vnode *vp = ap->a_vp; struct denode *dep = VTODE(vp); struct msdosfsmount *pmp = dep->de_pmp; struct uio *uio = ap->a_uio; int isadir, error = 0; uint32_t n, diff, size, on; struct buf *bp; uint32_t cn; daddr_t bn; /* * If they didn't ask for any data, then we are done. */ if (uio->uio_resid == 0) return (0); if (uio->uio_offset < 0) return (EINVAL); isadir = dep->de_Attributes & ATTR_DIRECTORY; do { if (uio->uio_offset >= dep->de_FileSize) return (0); cn = de_cluster(pmp, uio->uio_offset); size = pmp->pm_bpcluster; on = uio->uio_offset & pmp->pm_crbomask; n = ulmin(pmp->pm_bpcluster - on, uio->uio_resid); /* * de_FileSize is uint32_t, and we know that uio_offset < * de_FileSize, so uio->uio_offset < 2^32. Therefore * the cast to uint32_t on the next line is safe. */ diff = dep->de_FileSize - (uint32_t)uio->uio_offset; if (diff < n) n = diff; /* * If we are operating on a directory file then be sure to * do i/o with the vnode for the filesystem instead of the * vnode for the directory. */ if (isadir) { /* convert cluster # to block # */ error = pcbmap(dep, cn, &bn, 0, &size); if (error) return (error); error = bread(pmp->pm_devvp, bn, size, &bp); } else { if (de_cn2off(pmp, cn + 1) >= dep->de_FileSize) error = bread(vp, cn, size, &bp); else error = bread_cluster(vp, cn, size, &bp); } n = min(n, pmp->pm_bpcluster - bp->b_resid); if (error) { brelse(bp); return (error); } error = uiomove(bp->b_data + on, n, uio); brelse(bp); } while (error == 0 && uio->uio_resid > 0 && n != 0); if (!isadir && !(vp->v_mount->mnt_flag & MNT_NOATIME)) dep->de_flag |= DE_ACCESS; return (error); } /* * Write data to a file or directory. */ int msdosfs_write(void *v) { struct vop_write_args *ap = v; uint32_t n, croffset; size_t resid; ssize_t overrun; int extended = 0; uint32_t osize; int error = 0; uint32_t count, lastcn, cn; struct buf *bp; int ioflag = ap->a_ioflag; struct uio *uio = ap->a_uio; struct vnode *vp = ap->a_vp; struct vnode *thisvp; struct denode *dep = VTODE(vp); struct msdosfsmount *pmp = dep->de_pmp; struct ucred *cred = ap->a_cred; #ifdef MSDOSFS_DEBUG printf("msdosfs_write(vp %p, uio %p, ioflag %08x, cred %p\n", vp, uio, ioflag, cred); printf("msdosfs_write(): diroff %d, dirclust %d, startcluster %d\n", dep->de_diroffset, dep->de_dirclust, dep->de_StartCluster); #endif switch (vp->v_type) { case VREG: if (ioflag & IO_APPEND) uio->uio_offset = dep->de_FileSize; thisvp = vp; break; case VDIR: return EISDIR; default: panic("msdosfs_write(): bad file type"); } if (uio->uio_offset < 0) return (EINVAL); if (uio->uio_resid == 0) return (0); /* Don't bother to try to write files larger than the f/s limit */ if (uio->uio_offset > MSDOSFS_FILESIZE_MAX || uio->uio_resid > (MSDOSFS_FILESIZE_MAX - uio->uio_offset)) return (EFBIG); /* do the filesize rlimit check */ if ((error = vn_fsizechk(vp, uio, ioflag, &overrun))) return (error); /* * If the offset we are starting the write at is beyond the end of * the file, then they've done a seek. Unix filesystems allow * files with holes in them, DOS doesn't so we must fill the hole * with zeroed blocks. */ if (uio->uio_offset > dep->de_FileSize) { if ((error = deextend(dep, uio->uio_offset, cred)) != 0) goto out; } /* * Remember some values in case the write fails. */ resid = uio->uio_resid; osize = dep->de_FileSize; /* * If we write beyond the end of the file, extend it to its ultimate * size ahead of the time to hopefully get a contiguous area. */ if (uio->uio_offset + resid > osize) { extended = 1; count = de_clcount(pmp, uio->uio_offset + resid) - de_clcount(pmp, osize); if ((error = extendfile(dep, count, NULL, NULL, 0)) && (error != ENOSPC || (ioflag & IO_UNIT))) goto errexit; lastcn = dep->de_fc[FC_LASTFC].fc_frcn; } else lastcn = de_clcount(pmp, osize) - 1; do { croffset = uio->uio_offset & pmp->pm_crbomask; cn = de_cluster(pmp, uio->uio_offset); if (cn > lastcn) { error = ENOSPC; break; } if (croffset == 0 && (de_cluster(pmp, uio->uio_offset + uio->uio_resid) > cn || (uio->uio_offset + uio->uio_resid) >= dep->de_FileSize)) { /* * If either the whole cluster gets written, * or we write the cluster from its start beyond EOF, * then no need to read data from disk. */ bp = getblk(thisvp, cn, pmp->pm_bpcluster, 0, INFSLP); clrbuf(bp); /* * Do the bmap now, since pcbmap needs buffers * for the fat table. (see msdosfs_strategy) */ if (bp->b_blkno == bp->b_lblkno) { error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); if (error) bp->b_blkno = -1; } if (bp->b_blkno == -1) { brelse(bp); if (!error) error = EIO; /* XXX */ break; } } else { /* * The block we need to write into exists, so * read it in. */ error = bread(thisvp, cn, pmp->pm_bpcluster, &bp); if (error) { brelse(bp); break; } } n = ulmin(uio->uio_resid, pmp->pm_bpcluster - croffset); if (uio->uio_offset + n > dep->de_FileSize) { dep->de_FileSize = uio->uio_offset + n; uvm_vnp_setsize(vp, dep->de_FileSize); } uvm_vnp_uncache(vp); /* * Should these vnode_pager_* functions be done on dir * files? */ /* * Copy the data from user space into the buf header. */ error = uiomove(bp->b_data + croffset, n, uio); /* * If they want this synchronous then write it and wait for * it. Otherwise, if on a cluster boundary write it * asynchronously so we can move on to the next block * without delay. Otherwise do a delayed write because we * may want to write somemore into the block later. */ #if 0 if (ioflag & IO_NOCACHE) bp->b_flags |= B_NOCACHE; #endif if (ioflag & IO_SYNC) (void) bwrite(bp); else if (n + croffset == pmp->pm_bpcluster) bawrite(bp); else bdwrite(bp); dep->de_flag |= DE_UPDATE; } while (error == 0 && uio->uio_resid > 0); if (resid > uio->uio_resid) VN_KNOTE(ap->a_vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); if (dep->de_FileSize < osize) VN_KNOTE(ap->a_vp, NOTE_TRUNCATE); /* * If the write failed and they want us to, truncate the file back * to the size it was before the write was attempted. */ errexit: if (error) { if (ioflag & IO_UNIT) { detrunc(dep, osize, ioflag & IO_SYNC, NOCRED, NULL); uio->uio_offset -= resid - uio->uio_resid; uio->uio_resid = resid; } else { detrunc(dep, dep->de_FileSize, ioflag & IO_SYNC, NOCRED, NULL); if (uio->uio_resid != resid) error = 0; } } else if (ioflag & IO_SYNC) error = deupdat(dep, 1); out: /* correct the result for writes clamped by vn_fsizechk() */ uio->uio_resid += overrun; return (error); } int msdosfs_ioctl(void *v) { return (ENOTTY); } int msdosfs_poll(void *v) { struct vop_poll_args *ap = v; return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); } /* * Flush the blocks of a file to disk. * * This function is worthless for vnodes that represent directories. Maybe we * could just do a sync if they try an fsync on a directory file. */ int msdosfs_fsync(void *v) { struct vop_fsync_args *ap = v; struct vnode *vp = ap->a_vp; vflushbuf(vp, ap->a_waitfor == MNT_WAIT); return (deupdat(VTODE(vp), ap->a_waitfor == MNT_WAIT)); } /* * Flush the blocks of a file to disk. * * This function is worthless for vnodes that represent directories. Maybe we * could just do a sync if they try an fsync on a directory file. */ int msdosfs_remove(void *v) { struct vop_remove_args *ap = v; struct denode *dep = VTODE(ap->a_vp); struct denode *ddep = VTODE(ap->a_dvp); int error; if (ap->a_vp->v_type == VDIR) error = EPERM; else error = removede(ddep, dep); VN_KNOTE(ap->a_vp, NOTE_DELETE); VN_KNOTE(ap->a_dvp, NOTE_WRITE); #ifdef MSDOSFS_DEBUG printf("msdosfs_remove(), dep %p, v_usecount %d\n", dep, ap->a_vp->v_usecount); #endif if (ddep == dep) vrele(ap->a_vp); else vput(ap->a_vp); /* causes msdosfs_inactive() to be called * via vrele() */ vput(ap->a_dvp); return (error); } /* * DOS filesystems don't know what links are. But since we already called * msdosfs_lookup() with create and lockparent, the parent is locked so we * have to free it before we return the error. */ int msdosfs_link(void *v) { struct vop_link_args *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EOPNOTSUPP); } /* * Renames on files require moving the denode to a new hash queue since the * denode's location is used to compute which hash queue to put the file * in. Unless it is a rename in place. For example "mv a b". * * What follows is the basic algorithm: * * if (file move) { * if (dest file exists) { * remove dest file * } * if (dest and src in same directory) { * rewrite name in existing directory slot * } else { * write new entry in dest directory * update offset and dirclust in denode * move denode to new hash chain * clear old directory entry * } * } else { * directory move * if (dest directory exists) { * if (dest is not empty) { * return ENOTEMPTY * } * remove dest directory * } * if (dest and src in same directory) { * rewrite name in existing entry * } else { * be sure dest is not a child of src directory * write entry in dest directory * update "." and ".." in moved directory * update offset and dirclust in denode * move denode to new hash chain * clear old directory entry for moved directory * } * } * * On entry: * source's parent directory is unlocked * source file or directory is unlocked * destination's parent directory is locked * destination file or directory is locked if it exists * * On exit: * all denodes should be released * * Notes: * I'm not sure how the memory containing the pathnames pointed at by the * componentname structures is freed, there may be some memory bleeding * for each rename done. */ int msdosfs_rename(void *v) { struct vop_rename_args *ap = v; struct vnode *tvp = ap->a_tvp; struct vnode *tdvp = ap->a_tdvp; struct vnode *fvp = ap->a_fvp; struct vnode *fdvp = ap->a_fdvp; struct componentname *tcnp = ap->a_tcnp; struct componentname *fcnp = ap->a_fcnp; struct denode *ip, *xp, *dp, *zp; u_char toname[11], oldname[11]; uint32_t from_diroffset, to_diroffset; u_char to_count; int doingdirectory = 0, newparent = 0; int error; uint32_t cn, pcl; daddr_t bn; struct msdosfsmount *pmp; struct direntry *dotdotp; struct buf *bp; pmp = VFSTOMSDOSFS(fdvp->v_mount); #ifdef DIAGNOSTIC if ((tcnp->cn_flags & HASBUF) == 0 || (fcnp->cn_flags & HASBUF) == 0) panic("msdosfs_rename: no name"); #endif /* * Check for cross-device rename. */ if ((fvp->v_mount != tdvp->v_mount) || (tvp && (fvp->v_mount != tvp->v_mount))) { error = EXDEV; abortit: VOP_ABORTOP(tdvp, tcnp); if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp) vput(tvp); VOP_ABORTOP(fdvp, fcnp); vrele(fdvp); vrele(fvp); return (error); } /* * If source and dest are the same, do nothing. */ if (tvp == fvp) { error = 0; goto abortit; } /* */ if ((error = vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY)) != 0) goto abortit; dp = VTODE(fdvp); ip = VTODE(fvp); /* * Be sure we are not renaming ".", "..", or an alias of ".". This * leads to a crippled directory tree. It's pretty tough to do a * "ls" or "pwd" with the "." directory entry missing, and "cd .." * doesn't work if the ".." entry is missing. */ if (ip->de_Attributes & ATTR_DIRECTORY) { /* * Avoid ".", "..", and aliases of "." for obvious reasons. */ if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') || dp == ip || (fcnp->cn_flags & ISDOTDOT) || (tcnp->cn_flags & ISDOTDOT) || (ip->de_flag & DE_RENAME)) { VOP_UNLOCK(fvp); error = EINVAL; goto abortit; } ip->de_flag |= DE_RENAME; doingdirectory++; } VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */ /* * When the target exists, both the directory * and target vnodes are returned locked. */ dp = VTODE(tdvp); xp = tvp ? VTODE(tvp) : NULL; /* * Remember direntry place to use for destination */ to_diroffset = dp->de_fndoffset; to_count = dp->de_fndcnt; /* * If ".." must be changed (ie the directory gets a new * parent) then the source directory must not be in the * directory hierarchy above the target, as this would * orphan everything below the source directory. Also * the user must have write permission in the source so * as to be able to change "..". We must repeat the call * to namei, as the parent directory is unlocked by the * call to doscheckpath(). */ error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc); VOP_UNLOCK(fvp); if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster) newparent = 1; vrele(fdvp); if (doingdirectory && newparent) { if (error) /* write access check above */ goto bad1; if (xp != NULL) vput(tvp); /* * doscheckpath() vput()'s dp, * so we have to do a relookup afterwards */ if ((error = doscheckpath(ip, dp)) != 0) goto out; if ((tcnp->cn_flags & SAVESTART) == 0) panic("msdosfs_rename: lost to startdir"); if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0) goto out; dp = VTODE(tdvp); xp = tvp ? VTODE(tvp) : NULL; } VN_KNOTE(tdvp, NOTE_WRITE); if (xp != NULL) { /* * Target must be empty if a directory and have no links * to it. Also, ensure source and target are compatible * (both directories, or both not directories). */ if (xp->de_Attributes & ATTR_DIRECTORY) { if (!dosdirempty(xp)) { error = ENOTEMPTY; goto bad1; } if (!doingdirectory) { error = ENOTDIR; goto bad1; } cache_purge(tdvp); } else if (doingdirectory) { error = EISDIR; goto bad1; } if ((error = removede(dp, xp)) != 0) goto bad1; VN_KNOTE(tvp, NOTE_DELETE); vput(tvp); xp = NULL; } /* * Convert the filename in tcnp into a dos filename. We copy this * into the denode and directory entry for the destination * file/directory. */ if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0) goto bad1; /* * Since from wasn't locked at various places above, * have to do a relookup here. */ fcnp->cn_flags &= ~MODMASK; fcnp->cn_flags |= LOCKPARENT | LOCKLEAF; if ((fcnp->cn_flags & SAVESTART) == 0) panic("msdosfs_rename: lost from startdir"); if (!newparent) VOP_UNLOCK(tdvp); (void) vfs_relookup(fdvp, &fvp, fcnp); if (fvp == NULL) { /* * From name has disappeared. */ if (doingdirectory) panic("rename: lost dir entry"); vrele(ap->a_fvp); if (newparent) VOP_UNLOCK(tdvp); vrele(tdvp); return 0; } xp = VTODE(fvp); zp = VTODE(fdvp); from_diroffset = zp->de_fndoffset; /* * Ensure that the directory entry still exists and has not * changed till now. If the source is a file the entry may * have been unlinked or renamed. In either case there is * no further work to be done. If the source is a directory * then it cannot have been rmdir'ed or renamed; this is * prohibited by the DE_RENAME flag. */ if (xp != ip) { if (doingdirectory) panic("rename: lost dir entry"); vrele(ap->a_fvp); if (newparent) VOP_UNLOCK(fdvp); xp = NULL; } else { vrele(fvp); xp = NULL; /* * First write a new entry in the destination * directory and mark the entry in the source directory * as deleted. Then move the denode to the correct hash * chain for its new location in the filesystem. And, if * we moved a directory, then update its .. entry to point * to the new parent directory. */ bcopy(ip->de_Name, oldname, 11); bcopy(toname, ip->de_Name, 11); /* update denode */ dp->de_fndoffset = to_diroffset; dp->de_fndcnt = to_count; error = createde(ip, dp, NULL, tcnp); if (error) { bcopy(oldname, ip->de_Name, 11); if (newparent) VOP_UNLOCK(fdvp); goto bad; } ip->de_refcnt++; zp->de_fndoffset = from_diroffset; if ((error = removede(zp, ip)) != 0) { /* XXX should really panic here, fs is corrupt */ if (newparent) VOP_UNLOCK(fdvp); goto bad; } cache_purge(fvp); if (!doingdirectory) { error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0, &ip->de_dirclust, 0); if (error) { /* XXX should really panic here, fs is corrupt */ if (newparent) VOP_UNLOCK(fdvp); goto bad; } ip->de_diroffset = to_diroffset; if (ip->de_dirclust != MSDOSFSROOT) ip->de_diroffset &= pmp->pm_crbomask; } reinsert(ip); if (newparent) VOP_UNLOCK(fdvp); } /* * If we moved a directory to a new parent directory, then we must * fixup the ".." entry in the moved directory. */ if (doingdirectory && newparent) { cn = ip->de_StartCluster; if (cn == MSDOSFSROOT) { /* this should never happen */ panic("msdosfs_rename: updating .. in root directory?"); } else bn = cntobn(pmp, cn); error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); if (error) { /* XXX should really panic here, fs is corrupt */ brelse(bp); goto bad; } dotdotp = (struct direntry *)bp->b_data; putushort(dotdotp[0].deStartCluster, cn); pcl = dp->de_StartCluster; if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) pcl = 0; putushort(dotdotp[1].deStartCluster, pcl); if (FAT32(pmp)) { putushort(dotdotp[0].deHighClust, cn >> 16); putushort(dotdotp[1].deHighClust, pcl >> 16); } if ((error = bwrite(bp)) != 0) { /* XXX should really panic here, fs is corrupt */ goto bad; } } VN_KNOTE(fvp, NOTE_RENAME); bad: VOP_UNLOCK(fvp); vrele(fdvp); bad1: if (xp) vput(tvp); vput(tdvp); out: ip->de_flag &= ~DE_RENAME; vrele(fvp); return (error); } struct { struct direntry dot; struct direntry dotdot; } dosdirtemplate = { { ". ", " ", /* the . entry */ ATTR_DIRECTORY, /* file attribute */ CASE_LOWER_BASE | CASE_LOWER_EXT, /* lower case */ 0, /* create time 100ths */ { 0, 0 }, { 0, 0 }, /* create time & date */ { 0, 0 }, /* access date */ { 0, 0 }, /* high bits of start cluster */ { 210, 4 }, { 210, 4 }, /* modify time & date */ { 0, 0 }, /* startcluster */ { 0, 0, 0, 0 } /* filesize */ }, { ".. ", " ", /* the .. entry */ ATTR_DIRECTORY, /* file attribute */ CASE_LOWER_BASE | CASE_LOWER_EXT, /* lower case */ 0, /* create time 100ths */ { 0, 0 }, { 0, 0 }, /* create time & date */ { 0, 0 }, /* access date */ { 0, 0 }, /* high bits of start cluster */ { 210, 4 }, { 210, 4 }, /* modify time & date */ { 0, 0 }, /* startcluster */ { 0, 0, 0, 0 } /* filesize */ } }; int msdosfs_mkdir(void *v) { struct vop_mkdir_args *ap = v; struct componentname *cnp = ap->a_cnp; struct denode ndirent; struct denode *dep; struct denode *pdep = VTODE(ap->a_dvp); int error; daddr_t bn; uint32_t newcluster, pcl; struct direntry *denp; struct msdosfsmount *pmp = pdep->de_pmp; struct buf *bp; struct timespec ts; /* * If this is the root directory and there is no space left we * can't do anything. This is because the root directory can not * change size. */ if (pdep->de_StartCluster == MSDOSFSROOT && pdep->de_fndoffset >= pdep->de_FileSize) { error = ENOSPC; goto bad2; } /* * Allocate a cluster to hold the about to be created directory. */ error = clusteralloc(pmp, 0, 1, &newcluster, NULL); if (error) goto bad2; bzero(&ndirent, sizeof(ndirent)); ndirent.de_pmp = pmp; ndirent.de_flag = DE_ACCESS | DE_CREATE | DE_UPDATE; getnanotime(&ts); DETIMES(&ndirent, &ts, &ts, &ts); /* * Now fill the cluster with the "." and ".." entries. And write * the cluster to disk. This way it is there for the parent * directory to be pointing at if there were a crash. */ bn = cntobn(pmp, newcluster); /* always succeeds */ bp = getblk(pmp->pm_devvp, bn, pmp->pm_bpcluster, 0, INFSLP); bzero(bp->b_data, pmp->pm_bpcluster); bcopy(&dosdirtemplate, bp->b_data, sizeof dosdirtemplate); denp = (struct direntry *)bp->b_data; putushort(denp[0].deStartCluster, newcluster); putushort(denp[0].deCDate, ndirent.de_CDate); putushort(denp[0].deCTime, ndirent.de_CTime); denp[0].deCTimeHundredth = ndirent.de_CTimeHundredth; putushort(denp[0].deADate, ndirent.de_ADate); putushort(denp[0].deMDate, ndirent.de_MDate); putushort(denp[0].deMTime, ndirent.de_MTime); pcl = pdep->de_StartCluster; if (FAT32(pmp) && pcl == pmp->pm_rootdirblk) pcl = 0; putushort(denp[1].deStartCluster, pcl); putushort(denp[1].deCDate, ndirent.de_CDate); putushort(denp[1].deCTime, ndirent.de_CTime); denp[1].deCTimeHundredth = ndirent.de_CTimeHundredth; putushort(denp[1].deADate, ndirent.de_ADate); putushort(denp[1].deMDate, ndirent.de_MDate); putushort(denp[1].deMTime, ndirent.de_MTime); if (FAT32(pmp)) { putushort(denp[0].deHighClust, newcluster >> 16); putushort(denp[1].deHighClust, pdep->de_StartCluster >> 16); } if ((error = bwrite(bp)) != 0) goto bad; /* * Now build up a directory entry pointing to the newly allocated * cluster. This will be written to an empty slot in the parent * directory. */ #ifdef DIAGNOSTIC if ((cnp->cn_flags & HASBUF) == 0) panic("msdosfs_mkdir: no name"); #endif if ((error = uniqdosname(pdep, cnp, ndirent.de_Name)) != 0) goto bad; ndirent.de_Attributes = ATTR_DIRECTORY; ndirent.de_StartCluster = newcluster; ndirent.de_FileSize = 0; ndirent.de_dev = pdep->de_dev; ndirent.de_devvp = pdep->de_devvp; if ((error = createde(&ndirent, pdep, &dep, cnp)) != 0) goto bad; if ((cnp->cn_flags & SAVESTART) == 0) pool_put(&namei_pool, cnp->cn_pnbuf); VN_KNOTE(ap->a_dvp, NOTE_WRITE | NOTE_LINK); vput(ap->a_dvp); *ap->a_vpp = DETOV(dep); return (0); bad: clusterfree(pmp, newcluster, NULL); bad2: pool_put(&namei_pool, cnp->cn_pnbuf); vput(ap->a_dvp); return (error); } int msdosfs_rmdir(void *v) { struct vop_rmdir_args *ap = v; struct vnode *vp = ap->a_vp; struct vnode *dvp = ap->a_dvp; struct componentname *cnp = ap->a_cnp; struct denode *ip, *dp; int error; ip = VTODE(vp); dp = VTODE(dvp); /* * Verify the directory is empty (and valid). * (Rmdir ".." won't be valid since * ".." will contain a reference to * the current directory and thus be * non-empty.) */ error = 0; if (!dosdirempty(ip) || ip->de_flag & DE_RENAME) { error = ENOTEMPTY; goto out; } VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); /* * Delete the entry from the directory. For dos filesystems this * gets rid of the directory entry on disk, the in memory copy * still exists but the de_refcnt is <= 0. This prevents it from * being found by deget(). When the vput() on dep is done we give * up access and eventually msdosfs_reclaim() will be called which * will remove it from the denode cache. */ if ((error = removede(dp, ip)) != 0) goto out; /* * This is where we decrement the link count in the parent * directory. Since dos filesystems don't do this we just purge * the name cache and let go of the parent directory denode. */ cache_purge(dvp); vput(dvp); dvp = NULL; /* * Truncate the directory that is being deleted. */ error = detrunc(ip, (uint32_t)0, IO_SYNC, cnp->cn_cred, cnp->cn_proc); cache_purge(vp); out: if (dvp) vput(dvp); VN_KNOTE(vp, NOTE_DELETE); vput(vp); return (error); } /* * DOS filesystems don't know what symlinks are. */ int msdosfs_symlink(void *v) { struct vop_symlink_args *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EOPNOTSUPP); } int msdosfs_readdir(void *v) { struct vop_readdir_args *ap = v; int error = 0; int diff; long n; int blsize; long on; long lost; long count; uint32_t dirsperblk; uint32_t cn, lbn; uint32_t fileno; long bias = 0; daddr_t bn; struct buf *bp; struct denode *dep = VTODE(ap->a_vp); struct msdosfsmount *pmp = dep->de_pmp; struct direntry *dentp; struct dirent dirbuf; struct uio *uio = ap->a_uio; off_t offset, wlast = -1; int chksum = -1; #ifdef MSDOSFS_DEBUG printf("msdosfs_readdir(): vp %p, uio %p, cred %p, eofflagp %p\n", ap->a_vp, uio, ap->a_cred, ap->a_eofflag); #endif /* * msdosfs_readdir() won't operate properly on regular files since * it does i/o only with the filesystem vnode, and hence can * retrieve the wrong block from the buffer cache for a plain file. * So, fail attempts to readdir() on a plain file. */ if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) return (ENOTDIR); /* * To be safe, initialize dirbuf */ bzero(&dirbuf, sizeof(dirbuf)); /* * If the user buffer is smaller than the size of one dos directory * entry or the file offset is not a multiple of the size of a * directory entry, then we fail the read. */ count = uio->uio_resid & ~(sizeof(struct direntry) - 1); offset = uio->uio_offset; if (count < sizeof(struct direntry) || (offset & (sizeof(struct direntry) - 1))) return (EINVAL); lost = uio->uio_resid - count; uio->uio_resid = count; dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); /* * If they are reading from the root directory then, we simulate * the . and .. entries since these don't exist in the root * directory. We also set the offset bias to make up for having to * simulate these entries. By this I mean that at file offset 64 we * read the first entry in the root directory that lives on disk. */ if (dep->de_StartCluster == MSDOSFSROOT || (FAT32(pmp) && dep->de_StartCluster == pmp->pm_rootdirblk)) { #if 0 printf("msdosfs_readdir(): going after . or .. in root dir, offset %d\n", offset); #endif bias = 2 * sizeof(struct direntry); if (offset < bias) { for (n = (int)offset / sizeof(struct direntry); n < 2; n++) { if (FAT32(pmp)) dirbuf.d_fileno = pmp->pm_rootdirblk; else dirbuf.d_fileno = 1; dirbuf.d_type = DT_DIR; switch (n) { case 0: dirbuf.d_namlen = 1; strlcpy(dirbuf.d_name, ".", sizeof dirbuf.d_name); break; case 1: dirbuf.d_namlen = 2; strlcpy(dirbuf.d_name, "..", sizeof dirbuf.d_name); break; } dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); dirbuf.d_off = offset + sizeof(struct direntry); if (uio->uio_resid < dirbuf.d_reclen) goto out; error = uiomove(&dirbuf, dirbuf.d_reclen, uio); if (error) goto out; offset = dirbuf.d_off; } } } while (uio->uio_resid > 0) { lbn = de_cluster(pmp, offset - bias); on = (offset - bias) & pmp->pm_crbomask; n = min(pmp->pm_bpcluster - on, uio->uio_resid); diff = dep->de_FileSize - (offset - bias); if (diff <= 0) break; n = min(n, diff); if ((error = pcbmap(dep, lbn, &bn, &cn, &blsize)) != 0) break; error = bread(pmp->pm_devvp, bn, blsize, &bp); if (error) { brelse(bp); return (error); } n = min(n, blsize - bp->b_resid); /* * Convert from dos directory entries to fs-independent * directory entries. */ for (dentp = (struct direntry *)(bp->b_data + on); (char *)dentp < bp->b_data + on + n; dentp++, offset += sizeof(struct direntry)) { #if 0 printf("rd: dentp %08x prev %08x crnt %08x deName %02x attr %02x\n", dentp, prev, crnt, dentp->deName[0], dentp->deAttributes); #endif /* * If this is an unused entry, we can stop. */ if (dentp->deName[0] == SLOT_EMPTY) { brelse(bp); goto out; } /* * Skip deleted entries. */ if (dentp->deName[0] == SLOT_DELETED) { chksum = -1; wlast = -1; continue; } /* * Handle Win95 long directory entries */ if (dentp->deAttributes == ATTR_WIN95) { struct winentry *wep; if (pmp->pm_flags & MSDOSFSMNT_SHORTNAME) continue; wep = (struct winentry *)dentp; chksum = win2unixfn(wep, &dirbuf, chksum); if (wep->weCnt & WIN_LAST) wlast = offset; continue; } /* * Skip volume labels */ if (dentp->deAttributes & ATTR_VOLUME) { chksum = -1; wlast = -1; continue; } /* * This computation of d_fileno must match * the computation of va_fileid in * msdosfs_getattr. */ fileno = getushort(dentp->deStartCluster); if (FAT32(pmp)) fileno |= getushort(dentp->deHighClust) << 16; if (dentp->deAttributes & ATTR_DIRECTORY) { /* Special-case root */ if (fileno == MSDOSFSROOT) { fileno = FAT32(pmp) ? pmp->pm_rootdirblk : 1; } dirbuf.d_fileno = fileno; dirbuf.d_type = DT_DIR; } else { if (getulong(dentp->deFileSize) == 0) { uint64_t fileno64; fileno64 = (cn == MSDOSFSROOT) ? roottobn(pmp, 0) : cntobn(pmp, cn); fileno64 *= dirsperblk; fileno64 += dentp - (struct direntry *)bp->b_data; fileno = fileidhash(fileno64); } dirbuf.d_fileno = fileno; dirbuf.d_type = DT_REG; } if (chksum != winChksum(dentp->deName)) dirbuf.d_namlen = dos2unixfn(dentp->deName, (u_char *)dirbuf.d_name, pmp->pm_flags & MSDOSFSMNT_SHORTNAME); else dirbuf.d_name[dirbuf.d_namlen] = 0; chksum = -1; dirbuf.d_reclen = DIRENT_SIZE(&dirbuf); dirbuf.d_off = offset + sizeof(struct direntry); if (uio->uio_resid < dirbuf.d_reclen) { brelse(bp); /* Remember long-name offset. */ if (wlast != -1) offset = wlast; goto out; } wlast = -1; error = uiomove(&dirbuf, dirbuf.d_reclen, uio); if (error) { brelse(bp); goto out; } } brelse(bp); } out: uio->uio_offset = offset; uio->uio_resid += lost; if (dep->de_FileSize - (offset - bias) <= 0) *ap->a_eofflag = 1; else *ap->a_eofflag = 0; return (error); } /* * DOS filesystems don't know what symlinks are. */ int msdosfs_readlink(void *v) { #if 0 struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; } */ *ap; #endif return (EINVAL); } int msdosfs_lock(void *v) { struct vop_lock_args *ap = v; struct vnode *vp = ap->a_vp; return rrw_enter(&VTODE(vp)->de_lock, ap->a_flags & LK_RWFLAGS); } int msdosfs_unlock(void *v) { struct vop_unlock_args *ap = v; struct vnode *vp = ap->a_vp; rrw_exit(&VTODE(vp)->de_lock); return 0; } int msdosfs_islocked(void *v) { struct vop_islocked_args *ap = v; return rrw_status(&VTODE(ap->a_vp)->de_lock); } /* * vp - address of vnode file the file * bn - which cluster we are interested in mapping to a filesystem block number * vpp - returns the vnode for the block special file holding the filesystem * containing the file of interest * bnp - address of where to return the filesystem relative block number */ int msdosfs_bmap(void *v) { struct vop_bmap_args *ap = v; struct denode *dep = VTODE(ap->a_vp); uint32_t cn; if (ap->a_vpp != NULL) *ap->a_vpp = dep->de_devvp; if (ap->a_bnp == NULL) return (0); cn = ap->a_bn; if (cn != ap->a_bn) return (EFBIG); return (msdosfs_bmaparray(ap->a_vp, cn, ap->a_bnp, ap->a_runp)); } int msdosfs_bmaparray(struct vnode *vp, uint32_t cn, daddr_t *bnp, int *runp) { struct denode *dep = VTODE(vp); struct msdosfsmount *pmp = dep->de_pmp; struct mount *mp; int error, maxrun = 0, run; daddr_t runbn; mp = vp->v_mount; if (runp) { /* * XXX * If MAXBSIZE is the largest transfer the disks can handle, * we probably want maxrun to be 1 block less so that we * don't create a block larger than the device can handle. */ *runp = 0; maxrun = min(MAXBSIZE / mp->mnt_stat.f_iosize - 1, pmp->pm_maxcluster - cn); } if ((error = pcbmap(dep, cn, bnp, 0, 0)) != 0) return (error); for (run = 1; run <= maxrun; run++) { error = pcbmap(dep, cn + run, &runbn, 0, 0); if (error != 0 || (runbn != *bnp + de_cn2bn(pmp, run))) break; } if (runp) *runp = run - 1; return (0); } int msdosfs_strategy(void *v) { struct vop_strategy_args *ap = v; struct buf *bp = ap->a_bp; struct denode *dep = VTODE(bp->b_vp); struct vnode *vp; int error = 0; int s; if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR) panic("msdosfs_strategy: spec"); /* * If we don't already know the filesystem relative block number * then get it using pcbmap(). If pcbmap() returns the block * number as -1 then we've got a hole in the file. DOS filesystems * don't allow files with holes, so we shouldn't ever see this. */ if (bp->b_blkno == bp->b_lblkno) { error = pcbmap(dep, bp->b_lblkno, &bp->b_blkno, 0, 0); if (error) bp->b_blkno = -1; if (bp->b_blkno == -1) clrbuf(bp); } if (bp->b_blkno == -1) { s = splbio(); biodone(bp); splx(s); return (error); } /* * Read/write the block from/to the disk that contains the desired * file block. */ vp = dep->de_devvp; bp->b_dev = vp->v_rdev; (vp->v_op->vop_strategy)(ap); return (0); } int msdosfs_print(void *v) { struct vop_print_args *ap = v; struct denode *dep = VTODE(ap->a_vp); printf( "tag VT_MSDOSFS, startcluster %u, dircluster %u, diroffset %u ", dep->de_StartCluster, dep->de_dirclust, dep->de_diroffset); printf(" dev %d, %d, %s\n", major(dep->de_dev), minor(dep->de_dev), VOP_ISLOCKED(ap->a_vp) ? "(LOCKED)" : ""); #ifdef DIAGNOSTIC printf("\n"); #endif return (0); } int msdosfs_advlock(void *v) { struct vop_advlock_args *ap = v; struct denode *dep = VTODE(ap->a_vp); return (lf_advlock(&dep->de_lockf, dep->de_FileSize, ap->a_id, ap->a_op, ap->a_fl, ap->a_flags)); } int msdosfs_pathconf(void *v) { struct vop_pathconf_args *ap = v; struct msdosfsmount *pmp = VTODE(ap->a_vp)->de_pmp; int error = 0; switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = 1; break; case _PC_NAME_MAX: *ap->a_retval = pmp->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12; break; case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; break; case _PC_NO_TRUNC: *ap->a_retval = 0; break; case _PC_TIMESTAMP_RESOLUTION: *ap->a_retval = 2000000000; /* 2 billion nanoseconds */ break; default: error = EINVAL; break; } return (error); } /* * Thomas Wang's hash function, severely hacked to always set the high * bit on the number it returns (so no longer a proper hash function). */ static uint32_t fileidhash(uint64_t fileid) { uint64_t c1 = 0x6e5ea73858134343LL; uint64_t c2 = 0xb34e8f99a2ec9ef5LL; /* * We now have the original fileid value, as 64-bit value. * We need to reduce it to 32-bits, with the top bit set. */ fileid ^= ((c1 ^ fileid) >> 32); fileid *= c1; fileid ^= ((c2 ^ fileid) >> 31); fileid *= c2; fileid ^= ((c1 ^ fileid) >> 32); return (uint32_t)(fileid | 0x80000000); } /* Global vfs data structures for msdosfs */ const struct vops msdosfs_vops = { .vop_lookup = msdosfs_lookup, .vop_create = msdosfs_create, .vop_mknod = msdosfs_mknod, .vop_open = msdosfs_open, .vop_close = msdosfs_close, .vop_access = msdosfs_access, .vop_getattr = msdosfs_getattr, .vop_setattr = msdosfs_setattr, .vop_read = msdosfs_read, .vop_write = msdosfs_write, .vop_ioctl = msdosfs_ioctl, .vop_poll = msdosfs_poll, .vop_kqfilter = msdosfs_kqfilter, .vop_fsync = msdosfs_fsync, .vop_remove = msdosfs_remove, .vop_link = msdosfs_link, .vop_rename = msdosfs_rename, .vop_mkdir = msdosfs_mkdir, .vop_rmdir = msdosfs_rmdir, .vop_symlink = msdosfs_symlink, .vop_readdir = msdosfs_readdir, .vop_readlink = msdosfs_readlink, .vop_abortop = vop_generic_abortop, .vop_inactive = msdosfs_inactive, .vop_reclaim = msdosfs_reclaim, .vop_lock = msdosfs_lock, .vop_unlock = msdosfs_unlock, .vop_bmap = msdosfs_bmap, .vop_strategy = msdosfs_strategy, .vop_print = msdosfs_print, .vop_islocked = msdosfs_islocked, .vop_pathconf = msdosfs_pathconf, .vop_advlock = msdosfs_advlock, .vop_bwrite = vop_generic_bwrite, .vop_revoke = vop_generic_revoke, }; const struct filterops msdosfsread_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_msdosfsdetach, .f_event = filt_msdosfsread, }; const struct filterops msdosfswrite_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_msdosfsdetach, .f_event = filt_msdosfswrite, }; const struct filterops msdosfsvnode_filtops = { .f_flags = FILTEROP_ISFD, .f_attach = NULL, .f_detach = filt_msdosfsdetach, .f_event = filt_msdosfsvnode, }; int msdosfs_kqfilter(void *v) { struct vop_kqfilter_args *ap = v; struct vnode *vp = ap->a_vp; struct knote *kn = ap->a_kn; switch (kn->kn_filter) { case EVFILT_READ: kn->kn_fop = &msdosfsread_filtops; break; case EVFILT_WRITE: kn->kn_fop = &msdosfswrite_filtops; break; case EVFILT_VNODE: kn->kn_fop = &msdosfsvnode_filtops; break; default: return (EINVAL); } kn->kn_hook = (caddr_t)vp; klist_insert(&vp->v_selectinfo.si_note, kn); return (0); } void filt_msdosfsdetach(struct knote *kn) { struct vnode *vp = (struct vnode *)kn->kn_hook; klist_remove(&vp->v_selectinfo.si_note, kn); } int filt_msdosfsread(struct knote *kn, long hint) { struct vnode *vp = (struct vnode *)kn->kn_hook; struct denode *dep = VTODE(vp); /* * filesystem is gone, so set the EOF flag and schedule * the knote for deletion. */ if (hint == NOTE_REVOKE) { kn->kn_flags |= (EV_EOF | EV_ONESHOT); return (1); } kn->kn_data = dep->de_FileSize - foffset(kn->kn_fp); if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) { kn->kn_fflags |= NOTE_EOF; return (1); } if (kn->kn_flags & __EV_POLL) return (1); return (kn->kn_data != 0); } int filt_msdosfswrite(struct knote *kn, long hint) { /* * filesystem is gone, so set the EOF flag and schedule * the knote for deletion. */ if (hint == NOTE_REVOKE) { kn->kn_flags |= (EV_EOF | EV_ONESHOT); return (1); } kn->kn_data = 0; return (1); } int filt_msdosfsvnode(struct knote *kn, long hint) { if (kn->kn_sfflags & hint) kn->kn_fflags |= hint; if (hint == NOTE_REVOKE) { kn->kn_flags |= EV_EOF; return (1); } return (kn->kn_fflags != 0); }