^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * namei.c - NTFS kernel directory inode operations. Part of the Linux-NTFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * project.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2001-2006 Anton Altaparmakov
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "attrib.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "debug.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "dir.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "mft.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "ntfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * ntfs_lookup - find the inode represented by a dentry in a directory inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * @dir_ino: directory inode in which to look for the inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * @dent: dentry representing the inode to look for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @flags: lookup flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * In short, ntfs_lookup() looks for the inode represented by the dentry @dent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * in the directory inode @dir_ino and if found attaches the inode to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * dentry @dent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * In more detail, the dentry @dent specifies which inode to look for by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * supplying the name of the inode in @dent->d_name.name. ntfs_lookup()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * converts the name to Unicode and walks the contents of the directory inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * @dir_ino looking for the converted Unicode name. If the name is found in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * directory, the corresponding inode is loaded by calling ntfs_iget() on its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * inode number and the inode is associated with the dentry @dent via a call to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * d_splice_alias().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * If the name is not found in the directory, a NULL inode is inserted into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * dentry @dent via a call to d_add(). The dentry is then termed a negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * dentry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Only if an actual error occurs, do we return an error via ERR_PTR().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * In order to handle the case insensitivity issues of NTFS with regards to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * dcache and the dcache requiring only one dentry per directory, we deal with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * dentry aliases that only differ in case in ->ntfs_lookup() while maintaining
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * a case sensitive dcache. This means that we get the full benefit of dcache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * speed when the file/directory is looked up with the same case as returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * ->ntfs_readdir() but that a lookup for any other case (or for the short file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * name) will not find anything in dcache and will enter ->ntfs_lookup()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * instead, where we search the directory for a fully matching file name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * (including case) and if that is not found, we search for a file name that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * matches with different case and if that has non-POSIX semantics we return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * that. We actually do only one search (case sensitive) and keep tabs on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * whether we have found a case insensitive match in the process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * To simplify matters for us, we do not treat the short vs long filenames as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * two hard links but instead if the lookup matches a short filename, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * return the dentry for the corresponding long filename instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * There are three cases we need to distinguish here:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * 1) @dent perfectly matches (i.e. including case) a directory entry with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * file name in the WIN32 or POSIX namespaces. In this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * ntfs_lookup_inode_by_name() will return with name set to NULL and we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * just d_splice_alias() @dent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * 2) @dent matches (not including case) a directory entry with a file name in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * the WIN32 namespace. In this case ntfs_lookup_inode_by_name() will return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * with name set to point to a kmalloc()ed ntfs_name structure containing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * the properly cased little endian Unicode name. We convert the name to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * current NLS code page, search if a dentry with this name already exists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * and if so return that instead of @dent. At this point things are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * complicated by the possibility of 'disconnected' dentries due to NFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * which we deal with appropriately (see the code comments). The VFS will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * then destroy the old @dent and use the one we returned. If a dentry is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * not found, we allocate a new one, d_splice_alias() it, and return it as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * 3) @dent matches either perfectly or not (i.e. we don't care about case) a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * directory entry with a file name in the DOS namespace. In this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * ntfs_lookup_inode_by_name() will return with name set to point to a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * kmalloc()ed ntfs_name structure containing the mft reference (cpu endian)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * of the inode. We use the mft reference to read the inode and to find the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * file name in the WIN32 namespace corresponding to the matched short file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * name. We then convert the name to the current NLS code page, and proceed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * searching for a dentry with this name, etc, as in case 2), above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * Locking: Caller must hold i_mutex on the directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ntfs_volume *vol = NTFS_SB(dir_ino->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct inode *dent_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ntfschar *uname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ntfs_name *name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) MFT_REF mref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) unsigned long dent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) int uname_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ntfs_debug("Looking up %pd in directory inode 0x%lx.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) dent, dir_ino->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Convert the name of the dentry to Unicode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) uname_len = ntfs_nlstoucs(vol, dent->d_name.name, dent->d_name.len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) &uname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (uname_len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (uname_len != -ENAMETOOLONG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) ntfs_error(vol->sb, "Failed to convert name to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) "Unicode.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return ERR_PTR(uname_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) mref = ntfs_lookup_inode_by_name(NTFS_I(dir_ino), uname, uname_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) &name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) kmem_cache_free(ntfs_name_cache, uname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!IS_ERR_MREF(mref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) dent_ino = MREF(mref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ntfs_debug("Found inode 0x%lx. Calling ntfs_iget.", dent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) dent_inode = ntfs_iget(vol->sb, dent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (!IS_ERR(dent_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* Consistency check. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (is_bad_inode(dent_inode) || MSEQNO(mref) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) NTFS_I(dent_inode)->seq_no ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) dent_ino == FILE_MFT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* Perfect WIN32/POSIX match. -- Case 1. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ntfs_debug("Done. (Case 1.)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return d_splice_alias(dent_inode, dent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * We are too indented. Handle imperfect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * matches and short file names further below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) goto handle_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ntfs_error(vol->sb, "Found stale reference to inode "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) "0x%lx (reference sequence number = "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) "0x%x, inode sequence number = 0x%x), "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) "returning -EIO. Run chkdsk.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) dent_ino, MSEQNO(mref),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) NTFS_I(dent_inode)->seq_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) iput(dent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) dent_inode = ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ntfs_error(vol->sb, "ntfs_iget(0x%lx) failed with "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) "error code %li.", dent_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) PTR_ERR(dent_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* Return the error code. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return ERR_CAST(dent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* It is guaranteed that @name is no longer allocated at this point. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (MREF_ERR(mref) == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ntfs_debug("Entry was not found, adding negative dentry.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /* The dcache will handle negative entries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) d_add(dent, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) ntfs_debug("Done.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ntfs_error(vol->sb, "ntfs_lookup_ino_by_name() failed with error "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) "code %i.", -MREF_ERR(mref));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return ERR_PTR(MREF_ERR(mref));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) // TODO: Consider moving this lot to a separate function! (AIA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) handle_name:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) MFT_RECORD *m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ntfs_attr_search_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) ntfs_inode *ni = NTFS_I(dent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct qstr nls_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) nls_name.name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (name->type != FILE_NAME_DOS) { /* Case 2. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) ntfs_debug("Case 2.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) nls_name.len = (unsigned)ntfs_ucstonls(vol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) (ntfschar*)&name->name, name->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) (unsigned char**)&nls_name.name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) } else /* if (name->type == FILE_NAME_DOS) */ { /* Case 3. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) FILE_NAME_ATTR *fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) ntfs_debug("Case 3.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /* Find the WIN32 name corresponding to the matched DOS name. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) ni = NTFS_I(dent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) m = map_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (IS_ERR(m)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) err = PTR_ERR(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) m = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) ctx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) ctx = ntfs_attr_get_search_ctx(ni, m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (unlikely(!ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) ATTR_RECORD *a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) u32 val_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) NULL, 0, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (unlikely(err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ntfs_error(vol->sb, "Inode corrupt: No WIN32 "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) "namespace counterpart to DOS "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) "file name. Run chkdsk.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* Consistency checks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) a = ctx->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (a->non_resident || a->flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) goto eio_err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) val_len = le32_to_cpu(a->data.resident.value_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (le16_to_cpu(a->data.resident.value_offset) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) val_len > le32_to_cpu(a->length))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) goto eio_err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) fn = (FILE_NAME_ATTR*)((u8*)ctx->attr + le16_to_cpu(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) ctx->attr->data.resident.value_offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if ((u32)(fn->file_name_length * sizeof(ntfschar) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) sizeof(FILE_NAME_ATTR)) > val_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) goto eio_err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) } while (fn->file_name_type != FILE_NAME_WIN32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Convert the found WIN32 name to current NLS code page. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) nls_name.len = (unsigned)ntfs_ucstonls(vol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) (ntfschar*)&fn->file_name, fn->file_name_length,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) (unsigned char**)&nls_name.name, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) ntfs_attr_put_search_ctx(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) unmap_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) m = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ctx = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* Check if a conversion error occurred. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if ((signed)nls_name.len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) err = (signed)nls_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) nls_name.hash = full_name_hash(dent, nls_name.name, nls_name.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) dent = d_add_ci(dent, dent_inode, &nls_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) kfree(nls_name.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return dent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) eio_err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ntfs_error(vol->sb, "Illegal file name attribute. Run chkdsk.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) ntfs_attr_put_search_ctx(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) unmap_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) iput(dent_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ntfs_error(vol->sb, "Failed, returning error code %i.", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * Inode operations for directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) const struct inode_operations ntfs_dir_inode_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) .lookup = ntfs_lookup, /* VFS: Lookup directory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * ntfs_get_parent - find the dentry of the parent of a given directory dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * @child_dent: dentry of the directory whose parent directory to find
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * Find the dentry for the parent directory of the directory specified by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * dentry @child_dent. This function is called from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * fs/exportfs/expfs.c::find_exported_dentry() which in turn is called from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * default ->decode_fh() which is export_decode_fh() in the same file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * The code is based on the ext3 ->get_parent() implementation found in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * fs/ext3/namei.c::ext3_get_parent().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * Note: ntfs_get_parent() is called with @d_inode(child_dent)->i_mutex down.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * Return the dentry of the parent directory on success or the error code on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * error (IS_ERR() is true).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static struct dentry *ntfs_get_parent(struct dentry *child_dent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) struct inode *vi = d_inode(child_dent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ntfs_inode *ni = NTFS_I(vi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) MFT_RECORD *mrec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ntfs_attr_search_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ATTR_RECORD *attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) FILE_NAME_ATTR *fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) unsigned long parent_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /* Get the mft record of the inode belonging to the child dentry. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) mrec = map_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (IS_ERR(mrec))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) return ERR_CAST(mrec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /* Find the first file name attribute in the mft record. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) ctx = ntfs_attr_get_search_ctx(ni, mrec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (unlikely(!ctx)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) unmap_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) try_next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, CASE_SENSITIVE, 0, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 0, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) if (unlikely(err)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) ntfs_attr_put_search_ctx(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) unmap_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) ntfs_error(vi->i_sb, "Inode 0x%lx does not have a "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) "file name attribute. Run chkdsk.",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) vi->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) attr = ctx->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (unlikely(attr->non_resident))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) goto try_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) fn = (FILE_NAME_ATTR *)((u8 *)attr +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) le16_to_cpu(attr->data.resident.value_offset));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (unlikely((u8 *)fn + le32_to_cpu(attr->data.resident.value_length) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) (u8*)attr + le32_to_cpu(attr->length)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto try_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) /* Get the inode number of the parent directory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) parent_ino = MREF_LE(fn->parent_directory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) /* Release the search context and the mft record of the child. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) ntfs_attr_put_search_ctx(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) unmap_mft_record(ni);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return d_obtain_alias(ntfs_iget(vi->i_sb, parent_ino));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static struct inode *ntfs_nfs_get_inode(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) u64 ino, u32 generation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) inode = ntfs_iget(sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (!IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (is_bad_inode(inode) || inode->i_generation != generation) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) inode = ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) static struct dentry *ntfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) ntfs_nfs_get_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) static struct dentry *ntfs_fh_to_parent(struct super_block *sb, struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return generic_fh_to_parent(sb, fid, fh_len, fh_type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) ntfs_nfs_get_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * Export operations allowing NFS exporting of mounted NTFS partitions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * We use the default ->encode_fh() for now. Note that they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * use 32 bits to store the inode number which is an unsigned long so on 64-bit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * architectures is usually 64 bits so it would all fail horribly on huge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * volumes. I guess we need to define our own encode and decode fh functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * that store 64-bit inode numbers at some point but for now we will ignore the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * problem...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * We also use the default ->get_name() helper (used by ->decode_fh() via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * fs/exportfs/expfs.c::find_exported_dentry()) as that is completely fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * independent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * The default ->get_parent() just returns -EACCES so we have to provide our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * own and the default ->get_dentry() is incompatible with NTFS due to not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * allowing the inode number 0 which is used in NTFS for the system file $MFT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * and due to using iget() whereas NTFS needs ntfs_iget().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) const struct export_operations ntfs_export_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) .get_parent = ntfs_get_parent, /* Find the parent of a given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) directory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) .fh_to_dentry = ntfs_fh_to_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) .fh_to_parent = ntfs_fh_to_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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