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-rw-r--r--fs/ntfs/dir.c1540
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. */
-};