diff options
Diffstat (limited to 'fs/ntfs/dir.c')
| -rw-r--r-- | fs/ntfs/dir.c | 1540 |
1 files changed, 0 insertions, 1540 deletions
diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c deleted file mode 100644 index 629723a8d7..0000000000 --- a/fs/ntfs/dir.c +++ /dev/null @@ -1,1540 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * dir.c - NTFS kernel directory operations. Part of the Linux-NTFS project. - * - * Copyright (c) 2001-2007 Anton Altaparmakov - * Copyright (c) 2002 Richard Russon - */ - -#include <linux/buffer_head.h> -#include <linux/slab.h> -#include <linux/blkdev.h> - -#include "dir.h" -#include "aops.h" -#include "attrib.h" -#include "mft.h" -#include "debug.h" -#include "ntfs.h" - -/* - * The little endian Unicode string $I30 as a global constant. - */ -ntfschar I30[5] = { cpu_to_le16('$'), cpu_to_le16('I'), - cpu_to_le16('3'), cpu_to_le16('0'), 0 }; - -/** - * ntfs_lookup_inode_by_name - find an inode in a directory given its name - * @dir_ni: ntfs inode of the directory in which to search for the name - * @uname: Unicode name for which to search in the directory - * @uname_len: length of the name @uname in Unicode characters - * @res: return the found file name if necessary (see below) - * - * Look for an inode with name @uname in the directory with inode @dir_ni. - * ntfs_lookup_inode_by_name() walks the contents of the directory looking for - * the Unicode name. If the name is found in the directory, the corresponding - * inode number (>= 0) is returned as a mft reference in cpu format, i.e. it - * is a 64-bit number containing the sequence number. - * - * On error, a negative value is returned corresponding to the error code. In - * particular if the inode is not found -ENOENT is returned. Note that you - * can't just check the return value for being negative, you have to check the - * inode number for being negative which you can extract using MREC(return - * value). - * - * Note, @uname_len does not include the (optional) terminating NULL character. - * - * Note, we look for a case sensitive match first but we also look for a case - * insensitive match at the same time. If we find a case insensitive match, we - * save that for the case that we don't find an exact match, where we return - * the case insensitive match and setup @res (which we allocate!) with the mft - * reference, the file name type, length and with a copy of the little endian - * Unicode file name itself. If we match a file name which is in the DOS name - * space, we only return the mft reference and file name type in @res. - * ntfs_lookup() then uses this to find the long file name in the inode itself. - * This is to avoid polluting the dcache with short file names. We want them to - * work but we don't care for how quickly one can access them. This also fixes - * the dcache aliasing issues. - * - * Locking: - Caller must hold i_mutex on the directory. - * - Each page cache page in the index allocation mapping must be - * locked whilst being accessed otherwise we may find a corrupt - * page due to it being under ->writepage at the moment which - * applies the mst protection fixups before writing out and then - * removes them again after the write is complete after which it - * unlocks the page. - */ -MFT_REF ntfs_lookup_inode_by_name(ntfs_inode *dir_ni, const ntfschar *uname, - const int uname_len, ntfs_name **res) -{ - ntfs_volume *vol = dir_ni->vol; - struct super_block *sb = vol->sb; - MFT_RECORD *m; - INDEX_ROOT *ir; - INDEX_ENTRY *ie; - INDEX_ALLOCATION *ia; - u8 *index_end; - u64 mref; - ntfs_attr_search_ctx *ctx; - int err, rc; - VCN vcn, old_vcn; - struct address_space *ia_mapping; - struct page *page; - u8 *kaddr; - ntfs_name *name = NULL; - - BUG_ON(!S_ISDIR(VFS_I(dir_ni)->i_mode)); - BUG_ON(NInoAttr(dir_ni)); - /* Get hold of the mft record for the directory. */ - m = map_mft_record(dir_ni); - if (IS_ERR(m)) { - ntfs_error(sb, "map_mft_record() failed with error code %ld.", - -PTR_ERR(m)); - return ERR_MREF(PTR_ERR(m)); - } - ctx = ntfs_attr_get_search_ctx(dir_ni, m); - if (unlikely(!ctx)) { - err = -ENOMEM; - goto err_out; - } - /* Find the index root attribute in the mft record. */ - err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE, 0, NULL, - 0, ctx); - if (unlikely(err)) { - if (err == -ENOENT) { - ntfs_error(sb, "Index root attribute missing in " - "directory inode 0x%lx.", - dir_ni->mft_no); - err = -EIO; - } - goto err_out; - } - /* Get to the index root value (it's been verified in read_inode). */ - ir = (INDEX_ROOT*)((u8*)ctx->attr + - le16_to_cpu(ctx->attr->data.resident.value_offset)); - index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length); - /* The first index entry. */ - ie = (INDEX_ENTRY*)((u8*)&ir->index + - le32_to_cpu(ir->index.entries_offset)); - /* - * Loop until we exceed valid memory (corruption case) or until we - * reach the last entry. - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - /* Bounds checks. */ - if ((u8*)ie < (u8*)ctx->mrec || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end) - goto dir_err_out; - /* - * The last entry cannot contain a name. It can however contain - * a pointer to a child node in the B+tree so we just break out. - */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* - * We perform a case sensitive comparison and if that matches - * we are done and return the mft reference of the inode (i.e. - * the inode number together with the sequence number for - * consistency checking). We convert it to cpu format before - * returning. - */ - if (ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, - CASE_SENSITIVE, vol->upcase, vol->upcase_len)) { -found_it: - /* - * We have a perfect match, so we don't need to care - * about having matched imperfectly before, so we can - * free name and set *res to NULL. - * However, if the perfect match is a short file name, - * we need to signal this through *res, so that - * ntfs_lookup() can fix dcache aliasing issues. - * As an optimization we just reuse an existing - * allocation of *res. - */ - if (ie->key.file_name.file_name_type == FILE_NAME_DOS) { - if (!name) { - name = kmalloc(sizeof(ntfs_name), - GFP_NOFS); - if (!name) { - err = -ENOMEM; - goto err_out; - } - } - name->mref = le64_to_cpu( - ie->data.dir.indexed_file); - name->type = FILE_NAME_DOS; - name->len = 0; - *res = name; - } else { - kfree(name); - *res = NULL; - } - mref = le64_to_cpu(ie->data.dir.indexed_file); - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(dir_ni); - return mref; - } - /* - * For a case insensitive mount, we also perform a case - * insensitive comparison (provided the file name is not in the - * POSIX namespace). If the comparison matches, and the name is - * in the WIN32 namespace, we cache the filename in *res so - * that the caller, ntfs_lookup(), can work on it. If the - * comparison matches, and the name is in the DOS namespace, we - * only cache the mft reference and the file name type (we set - * the name length to zero for simplicity). - */ - if (!NVolCaseSensitive(vol) && - ie->key.file_name.file_name_type && - ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, - IGNORE_CASE, vol->upcase, vol->upcase_len)) { - int name_size = sizeof(ntfs_name); - u8 type = ie->key.file_name.file_name_type; - u8 len = ie->key.file_name.file_name_length; - - /* Only one case insensitive matching name allowed. */ - if (name) { - ntfs_error(sb, "Found already allocated name " - "in phase 1. Please run chkdsk " - "and if that doesn't find any " - "errors please report you saw " - "this message to " - "linux-ntfs-dev@lists." - "sourceforge.net."); - goto dir_err_out; - } - - if (type != FILE_NAME_DOS) - name_size += len * sizeof(ntfschar); - name = kmalloc(name_size, GFP_NOFS); - if (!name) { - err = -ENOMEM; - goto err_out; - } - name->mref = le64_to_cpu(ie->data.dir.indexed_file); - name->type = type; - if (type != FILE_NAME_DOS) { - name->len = len; - memcpy(name->name, ie->key.file_name.file_name, - len * sizeof(ntfschar)); - } else - name->len = 0; - *res = name; - } - /* - * Not a perfect match, need to do full blown collation so we - * know which way in the B+tree we have to go. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - IGNORE_CASE, vol->upcase, vol->upcase_len); - /* - * If uname collates before the name of the current entry, there - * is definitely no such name in this index but we might need to - * descend into the B+tree so we just break out of the loop. - */ - if (rc == -1) - break; - /* The names are not equal, continue the search. */ - if (rc) - continue; - /* - * Names match with case insensitive comparison, now try the - * case sensitive comparison, which is required for proper - * collation. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - CASE_SENSITIVE, vol->upcase, vol->upcase_len); - if (rc == -1) - break; - if (rc) - continue; - /* - * Perfect match, this will never happen as the - * ntfs_are_names_equal() call will have gotten a match but we - * still treat it correctly. - */ - goto found_it; - } - /* - * We have finished with this index without success. Check for the - * presence of a child node and if not present return -ENOENT, unless - * we have got a matching name cached in name in which case return the - * mft reference associated with it. - */ - if (!(ie->flags & INDEX_ENTRY_NODE)) { - if (name) { - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(dir_ni); - return name->mref; - } - ntfs_debug("Entry not found."); - err = -ENOENT; - goto err_out; - } /* Child node present, descend into it. */ - /* Consistency check: Verify that an index allocation exists. */ - if (!NInoIndexAllocPresent(dir_ni)) { - ntfs_error(sb, "No index allocation attribute but index entry " - "requires one. Directory inode 0x%lx is " - "corrupt or driver bug.", dir_ni->mft_no); - goto err_out; - } - /* Get the starting vcn of the index_block holding the child node. */ - vcn = sle64_to_cpup((sle64*)((u8*)ie + le16_to_cpu(ie->length) - 8)); - ia_mapping = VFS_I(dir_ni)->i_mapping; - /* - * We are done with the index root and the mft record. Release them, - * otherwise we deadlock with ntfs_map_page(). - */ - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(dir_ni); - m = NULL; - ctx = NULL; -descend_into_child_node: - /* - * Convert vcn to index into the index allocation attribute in units - * of PAGE_SIZE and map the page cache page, reading it from - * disk if necessary. - */ - page = ntfs_map_page(ia_mapping, vcn << - dir_ni->itype.index.vcn_size_bits >> PAGE_SHIFT); - if (IS_ERR(page)) { - ntfs_error(sb, "Failed to map directory index page, error %ld.", - -PTR_ERR(page)); - err = PTR_ERR(page); - goto err_out; - } - lock_page(page); - kaddr = (u8*)page_address(page); -fast_descend_into_child_node: - /* Get to the index allocation block. */ - ia = (INDEX_ALLOCATION*)(kaddr + ((vcn << - dir_ni->itype.index.vcn_size_bits) & ~PAGE_MASK)); - /* Bounds checks. */ - if ((u8*)ia < kaddr || (u8*)ia > kaddr + PAGE_SIZE) { - ntfs_error(sb, "Out of bounds check failed. Corrupt directory " - "inode 0x%lx or driver bug.", dir_ni->mft_no); - goto unm_err_out; - } - /* Catch multi sector transfer fixup errors. */ - if (unlikely(!ntfs_is_indx_record(ia->magic))) { - ntfs_error(sb, "Directory index record with vcn 0x%llx is " - "corrupt. Corrupt inode 0x%lx. Run chkdsk.", - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - if (sle64_to_cpu(ia->index_block_vcn) != vcn) { - ntfs_error(sb, "Actual VCN (0x%llx) of index buffer is " - "different from expected VCN (0x%llx). " - "Directory inode 0x%lx is corrupt or driver " - "bug.", (unsigned long long) - sle64_to_cpu(ia->index_block_vcn), - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - if (le32_to_cpu(ia->index.allocated_size) + 0x18 != - dir_ni->itype.index.block_size) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx has a size (%u) differing from the " - "directory specified size (%u). Directory " - "inode is corrupt or driver bug.", - (unsigned long long)vcn, dir_ni->mft_no, - le32_to_cpu(ia->index.allocated_size) + 0x18, - dir_ni->itype.index.block_size); - goto unm_err_out; - } - index_end = (u8*)ia + dir_ni->itype.index.block_size; - if (index_end > kaddr + PAGE_SIZE) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx crosses page boundary. Impossible! " - "Cannot access! This is probably a bug in the " - "driver.", (unsigned long long)vcn, - dir_ni->mft_no); - goto unm_err_out; - } - index_end = (u8*)&ia->index + le32_to_cpu(ia->index.index_length); - if (index_end > (u8*)ia + dir_ni->itype.index.block_size) { - ntfs_error(sb, "Size of index buffer (VCN 0x%llx) of directory " - "inode 0x%lx exceeds maximum size.", - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - /* The first index entry. */ - ie = (INDEX_ENTRY*)((u8*)&ia->index + - le32_to_cpu(ia->index.entries_offset)); - /* - * Iterate similar to above big loop but applied to index buffer, thus - * loop until we exceed valid memory (corruption case) or until we - * reach the last entry. - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - /* Bounds check. */ - if ((u8*)ie < (u8*)ia || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end) { - ntfs_error(sb, "Index entry out of bounds in " - "directory inode 0x%lx.", - dir_ni->mft_no); - goto unm_err_out; - } - /* - * The last entry cannot contain a name. It can however contain - * a pointer to a child node in the B+tree so we just break out. - */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* - * We perform a case sensitive comparison and if that matches - * we are done and return the mft reference of the inode (i.e. - * the inode number together with the sequence number for - * consistency checking). We convert it to cpu format before - * returning. - */ - if (ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, - CASE_SENSITIVE, vol->upcase, vol->upcase_len)) { -found_it2: - /* - * We have a perfect match, so we don't need to care - * about having matched imperfectly before, so we can - * free name and set *res to NULL. - * However, if the perfect match is a short file name, - * we need to signal this through *res, so that - * ntfs_lookup() can fix dcache aliasing issues. - * As an optimization we just reuse an existing - * allocation of *res. - */ - if (ie->key.file_name.file_name_type == FILE_NAME_DOS) { - if (!name) { - name = kmalloc(sizeof(ntfs_name), - GFP_NOFS); - if (!name) { - err = -ENOMEM; - goto unm_err_out; - } - } - name->mref = le64_to_cpu( - ie->data.dir.indexed_file); - name->type = FILE_NAME_DOS; - name->len = 0; - *res = name; - } else { - kfree(name); - *res = NULL; - } - mref = le64_to_cpu(ie->data.dir.indexed_file); - unlock_page(page); - ntfs_unmap_page(page); - return mref; - } - /* - * For a case insensitive mount, we also perform a case - * insensitive comparison (provided the file name is not in the - * POSIX namespace). If the comparison matches, and the name is - * in the WIN32 namespace, we cache the filename in *res so - * that the caller, ntfs_lookup(), can work on it. If the - * comparison matches, and the name is in the DOS namespace, we - * only cache the mft reference and the file name type (we set - * the name length to zero for simplicity). - */ - if (!NVolCaseSensitive(vol) && - ie->key.file_name.file_name_type && - ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, - IGNORE_CASE, vol->upcase, vol->upcase_len)) { - int name_size = sizeof(ntfs_name); - u8 type = ie->key.file_name.file_name_type; - u8 len = ie->key.file_name.file_name_length; - - /* Only one case insensitive matching name allowed. */ - if (name) { - ntfs_error(sb, "Found already allocated name " - "in phase 2. Please run chkdsk " - "and if that doesn't find any " - "errors please report you saw " - "this message to " - "linux-ntfs-dev@lists." - "sourceforge.net."); - unlock_page(page); - ntfs_unmap_page(page); - goto dir_err_out; - } - - if (type != FILE_NAME_DOS) - name_size += len * sizeof(ntfschar); - name = kmalloc(name_size, GFP_NOFS); - if (!name) { - err = -ENOMEM; - goto unm_err_out; - } - name->mref = le64_to_cpu(ie->data.dir.indexed_file); - name->type = type; - if (type != FILE_NAME_DOS) { - name->len = len; - memcpy(name->name, ie->key.file_name.file_name, - len * sizeof(ntfschar)); - } else - name->len = 0; - *res = name; - } - /* - * Not a perfect match, need to do full blown collation so we - * know which way in the B+tree we have to go. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - IGNORE_CASE, vol->upcase, vol->upcase_len); - /* - * If uname collates before the name of the current entry, there - * is definitely no such name in this index but we might need to - * descend into the B+tree so we just break out of the loop. - */ - if (rc == -1) - break; - /* The names are not equal, continue the search. */ - if (rc) - continue; - /* - * Names match with case insensitive comparison, now try the - * case sensitive comparison, which is required for proper - * collation. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - CASE_SENSITIVE, vol->upcase, vol->upcase_len); - if (rc == -1) - break; - if (rc) - continue; - /* - * Perfect match, this will never happen as the - * ntfs_are_names_equal() call will have gotten a match but we - * still treat it correctly. - */ - goto found_it2; - } - /* - * We have finished with this index buffer without success. Check for - * the presence of a child node. - */ - if (ie->flags & INDEX_ENTRY_NODE) { - if ((ia->index.flags & NODE_MASK) == LEAF_NODE) { - ntfs_error(sb, "Index entry with child node found in " - "a leaf node in directory inode 0x%lx.", - dir_ni->mft_no); - goto unm_err_out; - } - /* Child node present, descend into it. */ - old_vcn = vcn; - vcn = sle64_to_cpup((sle64*)((u8*)ie + - le16_to_cpu(ie->length) - 8)); - if (vcn >= 0) { - /* If vcn is in the same page cache page as old_vcn we - * recycle the mapped page. */ - if (old_vcn << vol->cluster_size_bits >> - PAGE_SHIFT == vcn << - vol->cluster_size_bits >> - PAGE_SHIFT) - goto fast_descend_into_child_node; - unlock_page(page); - ntfs_unmap_page(page); - goto descend_into_child_node; - } - ntfs_error(sb, "Negative child node vcn in directory inode " - "0x%lx.", dir_ni->mft_no); - goto unm_err_out; - } - /* - * No child node present, return -ENOENT, unless we have got a matching - * name cached in name in which case return the mft reference - * associated with it. - */ - if (name) { - unlock_page(page); - ntfs_unmap_page(page); - return name->mref; - } - ntfs_debug("Entry not found."); - err = -ENOENT; -unm_err_out: - unlock_page(page); - ntfs_unmap_page(page); -err_out: - if (!err) - err = -EIO; - if (ctx) - ntfs_attr_put_search_ctx(ctx); - if (m) - unmap_mft_record(dir_ni); - if (name) { - kfree(name); - *res = NULL; - } - return ERR_MREF(err); -dir_err_out: - ntfs_error(sb, "Corrupt directory. Aborting lookup."); - goto err_out; -} - -#if 0 - -// TODO: (AIA) -// The algorithm embedded in this code will be required for the time when we -// want to support adding of entries to directories, where we require correct -// collation of file names in order not to cause corruption of the filesystem. - -/** - * ntfs_lookup_inode_by_name - find an inode in a directory given its name - * @dir_ni: ntfs inode of the directory in which to search for the name - * @uname: Unicode name for which to search in the directory - * @uname_len: length of the name @uname in Unicode characters - * - * Look for an inode with name @uname in the directory with inode @dir_ni. - * ntfs_lookup_inode_by_name() walks the contents of the directory looking for - * the Unicode name. If the name is found in the directory, the corresponding - * inode number (>= 0) is returned as a mft reference in cpu format, i.e. it - * is a 64-bit number containing the sequence number. - * - * On error, a negative value is returned corresponding to the error code. In - * particular if the inode is not found -ENOENT is returned. Note that you - * can't just check the return value for being negative, you have to check the - * inode number for being negative which you can extract using MREC(return - * value). - * - * Note, @uname_len does not include the (optional) terminating NULL character. - */ -u64 ntfs_lookup_inode_by_name(ntfs_inode *dir_ni, const ntfschar *uname, - const int uname_len) -{ - ntfs_volume *vol = dir_ni->vol; - struct super_block *sb = vol->sb; - MFT_RECORD *m; - INDEX_ROOT *ir; - INDEX_ENTRY *ie; - INDEX_ALLOCATION *ia; - u8 *index_end; - u64 mref; - ntfs_attr_search_ctx *ctx; - int err, rc; - IGNORE_CASE_BOOL ic; - VCN vcn, old_vcn; - struct address_space *ia_mapping; - struct page *page; - u8 *kaddr; - - /* Get hold of the mft record for the directory. */ - m = map_mft_record(dir_ni); - if (IS_ERR(m)) { - ntfs_error(sb, "map_mft_record() failed with error code %ld.", - -PTR_ERR(m)); - return ERR_MREF(PTR_ERR(m)); - } - ctx = ntfs_attr_get_search_ctx(dir_ni, m); - if (!ctx) { - err = -ENOMEM; - goto err_out; - } - /* Find the index root attribute in the mft record. */ - err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE, 0, NULL, - 0, ctx); - if (unlikely(err)) { - if (err == -ENOENT) { - ntfs_error(sb, "Index root attribute missing in " - "directory inode 0x%lx.", - dir_ni->mft_no); - err = -EIO; - } - goto err_out; - } - /* Get to the index root value (it's been verified in read_inode). */ - ir = (INDEX_ROOT*)((u8*)ctx->attr + - le16_to_cpu(ctx->attr->data.resident.value_offset)); - index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length); - /* The first index entry. */ - ie = (INDEX_ENTRY*)((u8*)&ir->index + - le32_to_cpu(ir->index.entries_offset)); - /* - * Loop until we exceed valid memory (corruption case) or until we - * reach the last entry. - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - /* Bounds checks. */ - if ((u8*)ie < (u8*)ctx->mrec || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end) - goto dir_err_out; - /* - * The last entry cannot contain a name. It can however contain - * a pointer to a child node in the B+tree so we just break out. - */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* - * If the current entry has a name type of POSIX, the name is - * case sensitive and not otherwise. This has the effect of us - * not being able to access any POSIX file names which collate - * after the non-POSIX one when they only differ in case, but - * anyone doing screwy stuff like that deserves to burn in - * hell... Doing that kind of stuff on NT4 actually causes - * corruption on the partition even when using SP6a and Linux - * is not involved at all. - */ - ic = ie->key.file_name.file_name_type ? IGNORE_CASE : - CASE_SENSITIVE; - /* - * If the names match perfectly, we are done and return the - * mft reference of the inode (i.e. the inode number together - * with the sequence number for consistency checking. We - * convert it to cpu format before returning. - */ - if (ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, ic, - vol->upcase, vol->upcase_len)) { -found_it: - mref = le64_to_cpu(ie->data.dir.indexed_file); - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(dir_ni); - return mref; - } - /* - * Not a perfect match, need to do full blown collation so we - * know which way in the B+tree we have to go. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - IGNORE_CASE, vol->upcase, vol->upcase_len); - /* - * If uname collates before the name of the current entry, there - * is definitely no such name in this index but we might need to - * descend into the B+tree so we just break out of the loop. - */ - if (rc == -1) - break; - /* The names are not equal, continue the search. */ - if (rc) - continue; - /* - * Names match with case insensitive comparison, now try the - * case sensitive comparison, which is required for proper - * collation. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - CASE_SENSITIVE, vol->upcase, vol->upcase_len); - if (rc == -1) - break; - if (rc) - continue; - /* - * Perfect match, this will never happen as the - * ntfs_are_names_equal() call will have gotten a match but we - * still treat it correctly. - */ - goto found_it; - } - /* - * We have finished with this index without success. Check for the - * presence of a child node. - */ - if (!(ie->flags & INDEX_ENTRY_NODE)) { - /* No child node, return -ENOENT. */ - err = -ENOENT; - goto err_out; - } /* Child node present, descend into it. */ - /* Consistency check: Verify that an index allocation exists. */ - if (!NInoIndexAllocPresent(dir_ni)) { - ntfs_error(sb, "No index allocation attribute but index entry " - "requires one. Directory inode 0x%lx is " - "corrupt or driver bug.", dir_ni->mft_no); - goto err_out; - } - /* Get the starting vcn of the index_block holding the child node. */ - vcn = sle64_to_cpup((u8*)ie + le16_to_cpu(ie->length) - 8); - ia_mapping = VFS_I(dir_ni)->i_mapping; - /* - * We are done with the index root and the mft record. Release them, - * otherwise we deadlock with ntfs_map_page(). - */ - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(dir_ni); - m = NULL; - ctx = NULL; -descend_into_child_node: - /* - * Convert vcn to index into the index allocation attribute in units - * of PAGE_SIZE and map the page cache page, reading it from - * disk if necessary. - */ - page = ntfs_map_page(ia_mapping, vcn << - dir_ni->itype.index.vcn_size_bits >> PAGE_SHIFT); - if (IS_ERR(page)) { - ntfs_error(sb, "Failed to map directory index page, error %ld.", - -PTR_ERR(page)); - err = PTR_ERR(page); - goto err_out; - } - lock_page(page); - kaddr = (u8*)page_address(page); -fast_descend_into_child_node: - /* Get to the index allocation block. */ - ia = (INDEX_ALLOCATION*)(kaddr + ((vcn << - dir_ni->itype.index.vcn_size_bits) & ~PAGE_MASK)); - /* Bounds checks. */ - if ((u8*)ia < kaddr || (u8*)ia > kaddr + PAGE_SIZE) { - ntfs_error(sb, "Out of bounds check failed. Corrupt directory " - "inode 0x%lx or driver bug.", dir_ni->mft_no); - goto unm_err_out; - } - /* Catch multi sector transfer fixup errors. */ - if (unlikely(!ntfs_is_indx_record(ia->magic))) { - ntfs_error(sb, "Directory index record with vcn 0x%llx is " - "corrupt. Corrupt inode 0x%lx. Run chkdsk.", - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - if (sle64_to_cpu(ia->index_block_vcn) != vcn) { - ntfs_error(sb, "Actual VCN (0x%llx) of index buffer is " - "different from expected VCN (0x%llx). " - "Directory inode 0x%lx is corrupt or driver " - "bug.", (unsigned long long) - sle64_to_cpu(ia->index_block_vcn), - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - if (le32_to_cpu(ia->index.allocated_size) + 0x18 != - dir_ni->itype.index.block_size) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx has a size (%u) differing from the " - "directory specified size (%u). Directory " - "inode is corrupt or driver bug.", - (unsigned long long)vcn, dir_ni->mft_no, - le32_to_cpu(ia->index.allocated_size) + 0x18, - dir_ni->itype.index.block_size); - goto unm_err_out; - } - index_end = (u8*)ia + dir_ni->itype.index.block_size; - if (index_end > kaddr + PAGE_SIZE) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx crosses page boundary. Impossible! " - "Cannot access! This is probably a bug in the " - "driver.", (unsigned long long)vcn, - dir_ni->mft_no); - goto unm_err_out; - } - index_end = (u8*)&ia->index + le32_to_cpu(ia->index.index_length); - if (index_end > (u8*)ia + dir_ni->itype.index.block_size) { - ntfs_error(sb, "Size of index buffer (VCN 0x%llx) of directory " - "inode 0x%lx exceeds maximum size.", - (unsigned long long)vcn, dir_ni->mft_no); - goto unm_err_out; - } - /* The first index entry. */ - ie = (INDEX_ENTRY*)((u8*)&ia->index + - le32_to_cpu(ia->index.entries_offset)); - /* - * Iterate similar to above big loop but applied to index buffer, thus - * loop until we exceed valid memory (corruption case) or until we - * reach the last entry. - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - /* Bounds check. */ - if ((u8*)ie < (u8*)ia || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end) { - ntfs_error(sb, "Index entry out of bounds in " - "directory inode 0x%lx.", - dir_ni->mft_no); - goto unm_err_out; - } - /* - * The last entry cannot contain a name. It can however contain - * a pointer to a child node in the B+tree so we just break out. - */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* - * If the current entry has a name type of POSIX, the name is - * case sensitive and not otherwise. This has the effect of us - * not being able to access any POSIX file names which collate - * after the non-POSIX one when they only differ in case, but - * anyone doing screwy stuff like that deserves to burn in - * hell... Doing that kind of stuff on NT4 actually causes - * corruption on the partition even when using SP6a and Linux - * is not involved at all. - */ - ic = ie->key.file_name.file_name_type ? IGNORE_CASE : - CASE_SENSITIVE; - /* - * If the names match perfectly, we are done and return the - * mft reference of the inode (i.e. the inode number together - * with the sequence number for consistency checking. We - * convert it to cpu format before returning. - */ - if (ntfs_are_names_equal(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, ic, - vol->upcase, vol->upcase_len)) { -found_it2: - mref = le64_to_cpu(ie->data.dir.indexed_file); - unlock_page(page); - ntfs_unmap_page(page); - return mref; - } - /* - * Not a perfect match, need to do full blown collation so we - * know which way in the B+tree we have to go. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - IGNORE_CASE, vol->upcase, vol->upcase_len); - /* - * If uname collates before the name of the current entry, there - * is definitely no such name in this index but we might need to - * descend into the B+tree so we just break out of the loop. - */ - if (rc == -1) - break; - /* The names are not equal, continue the search. */ - if (rc) - continue; - /* - * Names match with case insensitive comparison, now try the - * case sensitive comparison, which is required for proper - * collation. - */ - rc = ntfs_collate_names(uname, uname_len, - (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, 1, - CASE_SENSITIVE, vol->upcase, vol->upcase_len); - if (rc == -1) - break; - if (rc) - continue; - /* - * Perfect match, this will never happen as the - * ntfs_are_names_equal() call will have gotten a match but we - * still treat it correctly. - */ - goto found_it2; - } - /* - * We have finished with this index buffer without success. Check for - * the presence of a child node. - */ - if (ie->flags & INDEX_ENTRY_NODE) { - if ((ia->index.flags & NODE_MASK) == LEAF_NODE) { - ntfs_error(sb, "Index entry with child node found in " - "a leaf node in directory inode 0x%lx.", - dir_ni->mft_no); - goto unm_err_out; - } - /* Child node present, descend into it. */ - old_vcn = vcn; - vcn = sle64_to_cpup((u8*)ie + le16_to_cpu(ie->length) - 8); - if (vcn >= 0) { - /* If vcn is in the same page cache page as old_vcn we - * recycle the mapped page. */ - if (old_vcn << vol->cluster_size_bits >> - PAGE_SHIFT == vcn << - vol->cluster_size_bits >> - PAGE_SHIFT) - goto fast_descend_into_child_node; - unlock_page(page); - ntfs_unmap_page(page); - goto descend_into_child_node; - } - ntfs_error(sb, "Negative child node vcn in directory inode " - "0x%lx.", dir_ni->mft_no); - goto unm_err_out; - } - /* No child node, return -ENOENT. */ - ntfs_debug("Entry not found."); - err = -ENOENT; -unm_err_out: - unlock_page(page); - ntfs_unmap_page(page); -err_out: - if (!err) - err = -EIO; - if (ctx) - ntfs_attr_put_search_ctx(ctx); - if (m) - unmap_mft_record(dir_ni); - return ERR_MREF(err); -dir_err_out: - ntfs_error(sb, "Corrupt directory. Aborting lookup."); - goto err_out; -} - -#endif - -/** - * ntfs_filldir - ntfs specific filldir method - * @vol: current ntfs volume - * @ndir: ntfs inode of current directory - * @ia_page: page in which the index allocation buffer @ie is in resides - * @ie: current index entry - * @name: buffer to use for the converted name - * @actor: what to feed the entries to - * - * Convert the Unicode @name to the loaded NLS and pass it to the @filldir - * callback. - * - * If @ia_page is not NULL it is the locked page containing the index - * allocation block containing the index entry @ie. - * - * Note, we drop (and then reacquire) the page lock on @ia_page across the - * @filldir() call otherwise we would deadlock with NFSd when it calls ->lookup - * since ntfs_lookup() will lock the same page. As an optimization, we do not - * retake the lock if we are returning a non-zero value as ntfs_readdir() - * would need to drop the lock immediately anyway. - */ -static inline int ntfs_filldir(ntfs_volume *vol, - ntfs_inode *ndir, struct page *ia_page, INDEX_ENTRY *ie, - u8 *name, struct dir_context *actor) -{ - unsigned long mref; - int name_len; - unsigned dt_type; - FILE_NAME_TYPE_FLAGS name_type; - - name_type = ie->key.file_name.file_name_type; - if (name_type == FILE_NAME_DOS) { - ntfs_debug("Skipping DOS name space entry."); - return 0; - } - if (MREF_LE(ie->data.dir.indexed_file) == FILE_root) { - ntfs_debug("Skipping root directory self reference entry."); - return 0; - } - if (MREF_LE(ie->data.dir.indexed_file) < FILE_first_user && - !NVolShowSystemFiles(vol)) { - ntfs_debug("Skipping system file."); - return 0; - } - name_len = ntfs_ucstonls(vol, (ntfschar*)&ie->key.file_name.file_name, - ie->key.file_name.file_name_length, &name, - NTFS_MAX_NAME_LEN * NLS_MAX_CHARSET_SIZE + 1); - if (name_len <= 0) { - ntfs_warning(vol->sb, "Skipping unrepresentable inode 0x%llx.", - (long long)MREF_LE(ie->data.dir.indexed_file)); - return 0; - } - if (ie->key.file_name.file_attributes & - FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT) - dt_type = DT_DIR; - else - dt_type = DT_REG; - mref = MREF_LE(ie->data.dir.indexed_file); - /* - * Drop the page lock otherwise we deadlock with NFS when it calls - * ->lookup since ntfs_lookup() will lock the same page. - */ - if (ia_page) - unlock_page(ia_page); - ntfs_debug("Calling filldir for %s with len %i, fpos 0x%llx, inode " - "0x%lx, DT_%s.", name, name_len, actor->pos, mref, - dt_type == DT_DIR ? "DIR" : "REG"); - if (!dir_emit(actor, name, name_len, mref, dt_type)) - return 1; - /* Relock the page but not if we are aborting ->readdir. */ - if (ia_page) - lock_page(ia_page); - return 0; -} - -/* - * We use the same basic approach as the old NTFS driver, i.e. we parse the - * index root entries and then the index allocation entries that are marked - * as in use in the index bitmap. - * - * While this will return the names in random order this doesn't matter for - * ->readdir but OTOH results in a faster ->readdir. - * - * VFS calls ->readdir without BKL but with i_mutex held. This protects the VFS - * parts (e.g. ->f_pos and ->i_size, and it also protects against directory - * modifications). - * - * Locking: - Caller must hold i_mutex on the directory. - * - Each page cache page in the index allocation mapping must be - * locked whilst being accessed otherwise we may find a corrupt - * page due to it being under ->writepage at the moment which - * applies the mst protection fixups before writing out and then - * removes them again after the write is complete after which it - * unlocks the page. - */ -static int ntfs_readdir(struct file *file, struct dir_context *actor) -{ - s64 ia_pos, ia_start, prev_ia_pos, bmp_pos; - loff_t i_size; - struct inode *bmp_vi, *vdir = file_inode(file); - struct super_block *sb = vdir->i_sb; - ntfs_inode *ndir = NTFS_I(vdir); - ntfs_volume *vol = NTFS_SB(sb); - MFT_RECORD *m; - INDEX_ROOT *ir = NULL; - INDEX_ENTRY *ie; - INDEX_ALLOCATION *ia; - u8 *name = NULL; - int rc, err, ir_pos, cur_bmp_pos; - struct address_space *ia_mapping, *bmp_mapping; - struct page *bmp_page = NULL, *ia_page = NULL; - u8 *kaddr, *bmp, *index_end; - ntfs_attr_search_ctx *ctx; - - ntfs_debug("Entering for inode 0x%lx, fpos 0x%llx.", - vdir->i_ino, actor->pos); - rc = err = 0; - /* Are we at end of dir yet? */ - i_size = i_size_read(vdir); - if (actor->pos >= i_size + vol->mft_record_size) - return 0; - /* Emulate . and .. for all directories. */ - if (!dir_emit_dots(file, actor)) - return 0; - m = NULL; - ctx = NULL; - /* - * Allocate a buffer to store the current name being processed - * converted to format determined by current NLS. - */ - name = kmalloc(NTFS_MAX_NAME_LEN * NLS_MAX_CHARSET_SIZE + 1, GFP_NOFS); - if (unlikely(!name)) { - err = -ENOMEM; - goto err_out; - } - /* Are we jumping straight into the index allocation attribute? */ - if (actor->pos >= vol->mft_record_size) - goto skip_index_root; - /* Get hold of the mft record for the directory. */ - m = map_mft_record(ndir); - if (IS_ERR(m)) { - err = PTR_ERR(m); - m = NULL; - goto err_out; - } - ctx = ntfs_attr_get_search_ctx(ndir, m); - if (unlikely(!ctx)) { - err = -ENOMEM; - goto err_out; - } - /* Get the offset into the index root attribute. */ - ir_pos = (s64)actor->pos; - /* Find the index root attribute in the mft record. */ - err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE, 0, NULL, - 0, ctx); - if (unlikely(err)) { - ntfs_error(sb, "Index root attribute missing in directory " - "inode 0x%lx.", vdir->i_ino); - goto err_out; - } - /* - * Copy the index root attribute value to a buffer so that we can put - * the search context and unmap the mft record before calling the - * filldir() callback. We need to do this because of NFSd which calls - * ->lookup() from its filldir callback() and this causes NTFS to - * deadlock as ntfs_lookup() maps the mft record of the directory and - * we have got it mapped here already. The only solution is for us to - * unmap the mft record here so that a call to ntfs_lookup() is able to - * map the mft record without deadlocking. - */ - rc = le32_to_cpu(ctx->attr->data.resident.value_length); - ir = kmalloc(rc, GFP_NOFS); - if (unlikely(!ir)) { - err = -ENOMEM; - goto err_out; - } - /* Copy the index root value (it has been verified in read_inode). */ - memcpy(ir, (u8*)ctx->attr + - le16_to_cpu(ctx->attr->data.resident.value_offset), rc); - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(ndir); - ctx = NULL; - m = NULL; - index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length); - /* The first index entry. */ - ie = (INDEX_ENTRY*)((u8*)&ir->index + - le32_to_cpu(ir->index.entries_offset)); - /* - * Loop until we exceed valid memory (corruption case) or until we - * reach the last entry or until filldir tells us it has had enough - * or signals an error (both covered by the rc test). - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - ntfs_debug("In index root, offset 0x%zx.", (u8*)ie - (u8*)ir); - /* Bounds checks. */ - if (unlikely((u8*)ie < (u8*)ir || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end)) - goto err_out; - /* The last entry cannot contain a name. */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* Skip index root entry if continuing previous readdir. */ - if (ir_pos > (u8*)ie - (u8*)ir) - continue; - /* Advance the position even if going to skip the entry. */ - actor->pos = (u8*)ie - (u8*)ir; - /* Submit the name to the filldir callback. */ - rc = ntfs_filldir(vol, ndir, NULL, ie, name, actor); - if (rc) { - kfree(ir); - goto abort; - } - } - /* We are done with the index root and can free the buffer. */ - kfree(ir); - ir = NULL; - /* If there is no index allocation attribute we are finished. */ - if (!NInoIndexAllocPresent(ndir)) - goto EOD; - /* Advance fpos to the beginning of the index allocation. */ - actor->pos = vol->mft_record_size; -skip_index_root: - kaddr = NULL; - prev_ia_pos = -1LL; - /* Get the offset into the index allocation attribute. */ - ia_pos = (s64)actor->pos - vol->mft_record_size; - ia_mapping = vdir->i_mapping; - ntfs_debug("Inode 0x%lx, getting index bitmap.", vdir->i_ino); - bmp_vi = ntfs_attr_iget(vdir, AT_BITMAP, I30, 4); - if (IS_ERR(bmp_vi)) { - ntfs_error(sb, "Failed to get bitmap attribute."); - err = PTR_ERR(bmp_vi); - goto err_out; - } - bmp_mapping = bmp_vi->i_mapping; - /* Get the starting bitmap bit position and sanity check it. */ - bmp_pos = ia_pos >> ndir->itype.index.block_size_bits; - if (unlikely(bmp_pos >> 3 >= i_size_read(bmp_vi))) { - ntfs_error(sb, "Current index allocation position exceeds " - "index bitmap size."); - goto iput_err_out; - } - /* Get the starting bit position in the current bitmap page. */ - cur_bmp_pos = bmp_pos & ((PAGE_SIZE * 8) - 1); - bmp_pos &= ~(u64)((PAGE_SIZE * 8) - 1); -get_next_bmp_page: - ntfs_debug("Reading bitmap with page index 0x%llx, bit ofs 0x%llx", - (unsigned long long)bmp_pos >> (3 + PAGE_SHIFT), - (unsigned long long)bmp_pos & - (unsigned long long)((PAGE_SIZE * 8) - 1)); - bmp_page = ntfs_map_page(bmp_mapping, - bmp_pos >> (3 + PAGE_SHIFT)); - if (IS_ERR(bmp_page)) { - ntfs_error(sb, "Reading index bitmap failed."); - err = PTR_ERR(bmp_page); - bmp_page = NULL; - goto iput_err_out; - } - bmp = (u8*)page_address(bmp_page); - /* Find next index block in use. */ - while (!(bmp[cur_bmp_pos >> 3] & (1 << (cur_bmp_pos & 7)))) { -find_next_index_buffer: - cur_bmp_pos++; - /* - * If we have reached the end of the bitmap page, get the next - * page, and put away the old one. - */ - if (unlikely((cur_bmp_pos >> 3) >= PAGE_SIZE)) { - ntfs_unmap_page(bmp_page); - bmp_pos += PAGE_SIZE * 8; - cur_bmp_pos = 0; - goto get_next_bmp_page; - } - /* If we have reached the end of the bitmap, we are done. */ - if (unlikely(((bmp_pos + cur_bmp_pos) >> 3) >= i_size)) - goto unm_EOD; - ia_pos = (bmp_pos + cur_bmp_pos) << - ndir->itype.index.block_size_bits; - } - ntfs_debug("Handling index buffer 0x%llx.", - (unsigned long long)bmp_pos + cur_bmp_pos); - /* If the current index buffer is in the same page we reuse the page. */ - if ((prev_ia_pos & (s64)PAGE_MASK) != - (ia_pos & (s64)PAGE_MASK)) { - prev_ia_pos = ia_pos; - if (likely(ia_page != NULL)) { - unlock_page(ia_page); - ntfs_unmap_page(ia_page); - } - /* - * Map the page cache page containing the current ia_pos, - * reading it from disk if necessary. - */ - ia_page = ntfs_map_page(ia_mapping, ia_pos >> PAGE_SHIFT); - if (IS_ERR(ia_page)) { - ntfs_error(sb, "Reading index allocation data failed."); - err = PTR_ERR(ia_page); - ia_page = NULL; - goto err_out; - } - lock_page(ia_page); - kaddr = (u8*)page_address(ia_page); - } - /* Get the current index buffer. */ - ia = (INDEX_ALLOCATION*)(kaddr + (ia_pos & ~PAGE_MASK & - ~(s64)(ndir->itype.index.block_size - 1))); - /* Bounds checks. */ - if (unlikely((u8*)ia < kaddr || (u8*)ia > kaddr + PAGE_SIZE)) { - ntfs_error(sb, "Out of bounds check failed. Corrupt directory " - "inode 0x%lx or driver bug.", vdir->i_ino); - goto err_out; - } - /* Catch multi sector transfer fixup errors. */ - if (unlikely(!ntfs_is_indx_record(ia->magic))) { - ntfs_error(sb, "Directory index record with vcn 0x%llx is " - "corrupt. Corrupt inode 0x%lx. Run chkdsk.", - (unsigned long long)ia_pos >> - ndir->itype.index.vcn_size_bits, vdir->i_ino); - goto err_out; - } - if (unlikely(sle64_to_cpu(ia->index_block_vcn) != (ia_pos & - ~(s64)(ndir->itype.index.block_size - 1)) >> - ndir->itype.index.vcn_size_bits)) { - ntfs_error(sb, "Actual VCN (0x%llx) of index buffer is " - "different from expected VCN (0x%llx). " - "Directory inode 0x%lx is corrupt or driver " - "bug. ", (unsigned long long) - sle64_to_cpu(ia->index_block_vcn), - (unsigned long long)ia_pos >> - ndir->itype.index.vcn_size_bits, vdir->i_ino); - goto err_out; - } - if (unlikely(le32_to_cpu(ia->index.allocated_size) + 0x18 != - ndir->itype.index.block_size)) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx has a size (%u) differing from the " - "directory specified size (%u). Directory " - "inode is corrupt or driver bug.", - (unsigned long long)ia_pos >> - ndir->itype.index.vcn_size_bits, vdir->i_ino, - le32_to_cpu(ia->index.allocated_size) + 0x18, - ndir->itype.index.block_size); - goto err_out; - } - index_end = (u8*)ia + ndir->itype.index.block_size; - if (unlikely(index_end > kaddr + PAGE_SIZE)) { - ntfs_error(sb, "Index buffer (VCN 0x%llx) of directory inode " - "0x%lx crosses page boundary. Impossible! " - "Cannot access! This is probably a bug in the " - "driver.", (unsigned long long)ia_pos >> - ndir->itype.index.vcn_size_bits, vdir->i_ino); - goto err_out; - } - ia_start = ia_pos & ~(s64)(ndir->itype.index.block_size - 1); - index_end = (u8*)&ia->index + le32_to_cpu(ia->index.index_length); - if (unlikely(index_end > (u8*)ia + ndir->itype.index.block_size)) { - ntfs_error(sb, "Size of index buffer (VCN 0x%llx) of directory " - "inode 0x%lx exceeds maximum size.", - (unsigned long long)ia_pos >> - ndir->itype.index.vcn_size_bits, vdir->i_ino); - goto err_out; - } - /* The first index entry in this index buffer. */ - ie = (INDEX_ENTRY*)((u8*)&ia->index + - le32_to_cpu(ia->index.entries_offset)); - /* - * Loop until we exceed valid memory (corruption case) or until we - * reach the last entry or until filldir tells us it has had enough - * or signals an error (both covered by the rc test). - */ - for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) { - ntfs_debug("In index allocation, offset 0x%llx.", - (unsigned long long)ia_start + - (unsigned long long)((u8*)ie - (u8*)ia)); - /* Bounds checks. */ - if (unlikely((u8*)ie < (u8*)ia || (u8*)ie + - sizeof(INDEX_ENTRY_HEADER) > index_end || - (u8*)ie + le16_to_cpu(ie->key_length) > - index_end)) - goto err_out; - /* The last entry cannot contain a name. */ - if (ie->flags & INDEX_ENTRY_END) - break; - /* Skip index block entry if continuing previous readdir. */ - if (ia_pos - ia_start > (u8*)ie - (u8*)ia) - continue; - /* Advance the position even if going to skip the entry. */ - actor->pos = (u8*)ie - (u8*)ia + - (sle64_to_cpu(ia->index_block_vcn) << - ndir->itype.index.vcn_size_bits) + - vol->mft_record_size; - /* - * Submit the name to the @filldir callback. Note, - * ntfs_filldir() drops the lock on @ia_page but it retakes it - * before returning, unless a non-zero value is returned in - * which case the page is left unlocked. - */ - rc = ntfs_filldir(vol, ndir, ia_page, ie, name, actor); - if (rc) { - /* @ia_page is already unlocked in this case. */ - ntfs_unmap_page(ia_page); - ntfs_unmap_page(bmp_page); - iput(bmp_vi); - goto abort; - } - } - goto find_next_index_buffer; -unm_EOD: - if (ia_page) { - unlock_page(ia_page); - ntfs_unmap_page(ia_page); - } - ntfs_unmap_page(bmp_page); - iput(bmp_vi); -EOD: - /* We are finished, set fpos to EOD. */ - actor->pos = i_size + vol->mft_record_size; -abort: - kfree(name); - return 0; -err_out: - if (bmp_page) { - ntfs_unmap_page(bmp_page); -iput_err_out: - iput(bmp_vi); - } - if (ia_page) { - unlock_page(ia_page); - ntfs_unmap_page(ia_page); - } - kfree(ir); - kfree(name); - if (ctx) - ntfs_attr_put_search_ctx(ctx); - if (m) - unmap_mft_record(ndir); - if (!err) - err = -EIO; - ntfs_debug("Failed. Returning error code %i.", -err); - return err; -} - -/** - * ntfs_dir_open - called when an inode is about to be opened - * @vi: inode to be opened - * @filp: file structure describing the inode - * - * Limit directory size to the page cache limit on architectures where unsigned - * long is 32-bits. This is the most we can do for now without overflowing the - * page cache page index. Doing it this way means we don't run into problems - * because of existing too large directories. It would be better to allow the - * user to read the accessible part of the directory but I doubt very much - * anyone is going to hit this check on a 32-bit architecture, so there is no - * point in adding the extra complexity required to support this. - * - * On 64-bit architectures, the check is hopefully optimized away by the - * compiler. - */ -static int ntfs_dir_open(struct inode *vi, struct file *filp) -{ - if (sizeof(unsigned long) < 8) { - if (i_size_read(vi) > MAX_LFS_FILESIZE) - return -EFBIG; - } - return 0; -} - -#ifdef NTFS_RW - -/** - * ntfs_dir_fsync - sync a directory to disk - * @filp: directory to be synced - * @start: offset in bytes of the beginning of data range to sync - * @end: offset in bytes of the end of data range (inclusive) - * @datasync: if non-zero only flush user data and not metadata - * - * Data integrity sync of a directory to disk. Used for fsync, fdatasync, and - * msync system calls. This function is based on file.c::ntfs_file_fsync(). - * - * Write the mft record and all associated extent mft records as well as the - * $INDEX_ALLOCATION and $BITMAP attributes and then sync the block device. - * - * If @datasync is true, we do not wait on the inode(s) to be written out - * but we always wait on the page cache pages to be written out. - * - * Note: In the past @filp could be NULL so we ignore it as we don't need it - * anyway. - * - * Locking: Caller must hold i_mutex on the inode. - * - * TODO: We should probably also write all attribute/index inodes associated - * with this inode but since we have no simple way of getting to them we ignore - * this problem for now. We do write the $BITMAP attribute if it is present - * which is the important one for a directory so things are not too bad. - */ -static int ntfs_dir_fsync(struct file *filp, loff_t start, loff_t end, - int datasync) -{ - struct inode *bmp_vi, *vi = filp->f_mapping->host; - int err, ret; - ntfs_attr na; - - ntfs_debug("Entering for inode 0x%lx.", vi->i_ino); - - err = file_write_and_wait_range(filp, start, end); - if (err) - return err; - inode_lock(vi); - - BUG_ON(!S_ISDIR(vi->i_mode)); - /* If the bitmap attribute inode is in memory sync it, too. */ - na.mft_no = vi->i_ino; - na.type = AT_BITMAP; - na.name = I30; - na.name_len = 4; - bmp_vi = ilookup5(vi->i_sb, vi->i_ino, ntfs_test_inode, &na); - if (bmp_vi) { - write_inode_now(bmp_vi, !datasync); - iput(bmp_vi); - } - ret = __ntfs_write_inode(vi, 1); - write_inode_now(vi, !datasync); - err = sync_blockdev(vi->i_sb->s_bdev); - if (unlikely(err && !ret)) - ret = err; - if (likely(!ret)) - ntfs_debug("Done."); - else - ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx. Error " - "%u.", datasync ? "data" : "", vi->i_ino, -ret); - inode_unlock(vi); - return ret; -} - -#endif /* NTFS_RW */ - -WRAP_DIR_ITER(ntfs_readdir) // FIXME! -const struct file_operations ntfs_dir_ops = { - .llseek = generic_file_llseek, /* Seek inside directory. */ - .read = generic_read_dir, /* Return -EISDIR. */ - .iterate_shared = shared_ntfs_readdir, /* Read directory contents. */ -#ifdef NTFS_RW - .fsync = ntfs_dir_fsync, /* Sync a directory to disk. */ -#endif /* NTFS_RW */ - /*.ioctl = ,*/ /* Perform function on the - mounted filesystem. */ - .open = ntfs_dir_open, /* Open directory. */ -}; |