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-rw-r--r--fs/ntfs/inode.c2616
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diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
new file mode 100644
index 00000000000..31840ba0b38
--- /dev/null
+++ b/fs/ntfs/inode.c
@@ -0,0 +1,2616 @@
+/**
+ * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
+ *
+ * Copyright (c) 2001-2004 Anton Altaparmakov
+ *
+ * This program/include file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program/include file is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (in the main directory of the Linux-NTFS
+ * distribution in the file COPYING); if not, write to the Free Software
+ * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
+#include <linux/quotaops.h>
+#include <linux/mount.h>
+
+#include "aops.h"
+#include "dir.h"
+#include "debug.h"
+#include "inode.h"
+#include "attrib.h"
+#include "malloc.h"
+#include "mft.h"
+#include "time.h"
+#include "ntfs.h"
+
+/**
+ * ntfs_test_inode - compare two (possibly fake) inodes for equality
+ * @vi: vfs inode which to test
+ * @na: ntfs attribute which is being tested with
+ *
+ * Compare the ntfs attribute embedded in the ntfs specific part of the vfs
+ * inode @vi for equality with the ntfs attribute @na.
+ *
+ * If searching for the normal file/directory inode, set @na->type to AT_UNUSED.
+ * @na->name and @na->name_len are then ignored.
+ *
+ * Return 1 if the attributes match and 0 if not.
+ *
+ * NOTE: This function runs with the inode_lock spin lock held so it is not
+ * allowed to sleep.
+ */
+int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
+{
+ ntfs_inode *ni;
+
+ if (vi->i_ino != na->mft_no)
+ return 0;
+ ni = NTFS_I(vi);
+ /* If !NInoAttr(ni), @vi is a normal file or directory inode. */
+ if (likely(!NInoAttr(ni))) {
+ /* If not looking for a normal inode this is a mismatch. */
+ if (unlikely(na->type != AT_UNUSED))
+ return 0;
+ } else {
+ /* A fake inode describing an attribute. */
+ if (ni->type != na->type)
+ return 0;
+ if (ni->name_len != na->name_len)
+ return 0;
+ if (na->name_len && memcmp(ni->name, na->name,
+ na->name_len * sizeof(ntfschar)))
+ return 0;
+ }
+ /* Match! */
+ return 1;
+}
+
+/**
+ * ntfs_init_locked_inode - initialize an inode
+ * @vi: vfs inode to initialize
+ * @na: ntfs attribute which to initialize @vi to
+ *
+ * Initialize the vfs inode @vi with the values from the ntfs attribute @na in
+ * order to enable ntfs_test_inode() to do its work.
+ *
+ * If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
+ * In that case, @na->name and @na->name_len should be set to NULL and 0,
+ * respectively. Although that is not strictly necessary as
+ * ntfs_read_inode_locked() will fill them in later.
+ *
+ * Return 0 on success and -errno on error.
+ *
+ * NOTE: This function runs with the inode_lock spin lock held so it is not
+ * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
+ */
+static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)
+{
+ ntfs_inode *ni = NTFS_I(vi);
+
+ vi->i_ino = na->mft_no;
+
+ ni->type = na->type;
+ if (na->type == AT_INDEX_ALLOCATION)
+ NInoSetMstProtected(ni);
+
+ ni->name = na->name;
+ ni->name_len = na->name_len;
+
+ /* If initializing a normal inode, we are done. */
+ if (likely(na->type == AT_UNUSED)) {
+ BUG_ON(na->name);
+ BUG_ON(na->name_len);
+ return 0;
+ }
+
+ /* It is a fake inode. */
+ NInoSetAttr(ni);
+
+ /*
+ * We have I30 global constant as an optimization as it is the name
+ * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC
+ * allocation but that is ok. And most attributes are unnamed anyway,
+ * thus the fraction of named attributes with name != I30 is actually
+ * absolutely tiny.
+ */
+ if (na->name_len && na->name != I30) {
+ unsigned int i;
+
+ BUG_ON(!na->name);
+ i = na->name_len * sizeof(ntfschar);
+ ni->name = (ntfschar*)kmalloc(i + sizeof(ntfschar), GFP_ATOMIC);
+ if (!ni->name)
+ return -ENOMEM;
+ memcpy(ni->name, na->name, i);
+ ni->name[i] = 0;
+ }
+ return 0;
+}
+
+typedef int (*set_t)(struct inode *, void *);
+static int ntfs_read_locked_inode(struct inode *vi);
+static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi);
+static int ntfs_read_locked_index_inode(struct inode *base_vi,
+ struct inode *vi);
+
+/**
+ * ntfs_iget - obtain a struct inode corresponding to a specific normal inode
+ * @sb: super block of mounted volume
+ * @mft_no: mft record number / inode number to obtain
+ *
+ * Obtain the struct inode corresponding to a specific normal inode (i.e. a
+ * file or directory).
+ *
+ * If the inode is in the cache, it is just returned with an increased
+ * reference count. Otherwise, a new struct inode is allocated and initialized,
+ * and finally ntfs_read_locked_inode() is called to read in the inode and
+ * fill in the remainder of the inode structure.
+ *
+ * Return the struct inode on success. Check the return value with IS_ERR() and
+ * if true, the function failed and the error code is obtained from PTR_ERR().
+ */
+struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
+{
+ struct inode *vi;
+ ntfs_attr na;
+ int err;
+
+ na.mft_no = mft_no;
+ na.type = AT_UNUSED;
+ na.name = NULL;
+ na.name_len = 0;
+
+ vi = iget5_locked(sb, mft_no, (test_t)ntfs_test_inode,
+ (set_t)ntfs_init_locked_inode, &na);
+ if (!vi)
+ return ERR_PTR(-ENOMEM);
+
+ err = 0;
+
+ /* If this is a freshly allocated inode, need to read it now. */
+ if (vi->i_state & I_NEW) {
+ err = ntfs_read_locked_inode(vi);
+ unlock_new_inode(vi);
+ }
+ /*
+ * There is no point in keeping bad inodes around if the failure was
+ * due to ENOMEM. We want to be able to retry again later.
+ */
+ if (err == -ENOMEM) {
+ iput(vi);
+ vi = ERR_PTR(err);
+ }
+ return vi;
+}
+
+/**
+ * ntfs_attr_iget - obtain a struct inode corresponding to an attribute
+ * @base_vi: vfs base inode containing the attribute
+ * @type: attribute type
+ * @name: Unicode name of the attribute (NULL if unnamed)
+ * @name_len: length of @name in Unicode characters (0 if unnamed)
+ *
+ * Obtain the (fake) struct inode corresponding to the attribute specified by
+ * @type, @name, and @name_len, which is present in the base mft record
+ * specified by the vfs inode @base_vi.
+ *
+ * If the attribute inode is in the cache, it is just returned with an
+ * increased reference count. Otherwise, a new struct inode is allocated and
+ * initialized, and finally ntfs_read_locked_attr_inode() is called to read the
+ * attribute and fill in the inode structure.
+ *
+ * Note, for index allocation attributes, you need to use ntfs_index_iget()
+ * instead of ntfs_attr_iget() as working with indices is a lot more complex.
+ *
+ * Return the struct inode of the attribute inode on success. Check the return
+ * value with IS_ERR() and if true, the function failed and the error code is
+ * obtained from PTR_ERR().
+ */
+struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
+ ntfschar *name, u32 name_len)
+{
+ struct inode *vi;
+ ntfs_attr na;
+ int err;
+
+ /* Make sure no one calls ntfs_attr_iget() for indices. */
+ BUG_ON(type == AT_INDEX_ALLOCATION);
+
+ na.mft_no = base_vi->i_ino;
+ na.type = type;
+ na.name = name;
+ na.name_len = name_len;
+
+ vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
+ (set_t)ntfs_init_locked_inode, &na);
+ if (!vi)
+ return ERR_PTR(-ENOMEM);
+
+ err = 0;
+
+ /* If this is a freshly allocated inode, need to read it now. */
+ if (vi->i_state & I_NEW) {
+ err = ntfs_read_locked_attr_inode(base_vi, vi);
+ unlock_new_inode(vi);
+ }
+ /*
+ * There is no point in keeping bad attribute inodes around. This also
+ * simplifies things in that we never need to check for bad attribute
+ * inodes elsewhere.
+ */
+ if (err) {
+ iput(vi);
+ vi = ERR_PTR(err);
+ }
+ return vi;
+}
+
+/**
+ * ntfs_index_iget - obtain a struct inode corresponding to an index
+ * @base_vi: vfs base inode containing the index related attributes
+ * @name: Unicode name of the index
+ * @name_len: length of @name in Unicode characters
+ *
+ * Obtain the (fake) struct inode corresponding to the index specified by @name
+ * and @name_len, which is present in the base mft record specified by the vfs
+ * inode @base_vi.
+ *
+ * If the index inode is in the cache, it is just returned with an increased
+ * reference count. Otherwise, a new struct inode is allocated and
+ * initialized, and finally ntfs_read_locked_index_inode() is called to read
+ * the index related attributes and fill in the inode structure.
+ *
+ * Return the struct inode of the index inode on success. Check the return
+ * value with IS_ERR() and if true, the function failed and the error code is
+ * obtained from PTR_ERR().
+ */
+struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
+ u32 name_len)
+{
+ struct inode *vi;
+ ntfs_attr na;
+ int err;
+
+ na.mft_no = base_vi->i_ino;
+ na.type = AT_INDEX_ALLOCATION;
+ na.name = name;
+ na.name_len = name_len;
+
+ vi = iget5_locked(base_vi->i_sb, na.mft_no, (test_t)ntfs_test_inode,
+ (set_t)ntfs_init_locked_inode, &na);
+ if (!vi)
+ return ERR_PTR(-ENOMEM);
+
+ err = 0;
+
+ /* If this is a freshly allocated inode, need to read it now. */
+ if (vi->i_state & I_NEW) {
+ err = ntfs_read_locked_index_inode(base_vi, vi);
+ unlock_new_inode(vi);
+ }
+ /*
+ * There is no point in keeping bad index inodes around. This also
+ * simplifies things in that we never need to check for bad index
+ * inodes elsewhere.
+ */
+ if (err) {
+ iput(vi);
+ vi = ERR_PTR(err);
+ }
+ return vi;
+}
+
+struct inode *ntfs_alloc_big_inode(struct super_block *sb)
+{
+ ntfs_inode *ni;
+
+ ntfs_debug("Entering.");
+ ni = (ntfs_inode *)kmem_cache_alloc(ntfs_big_inode_cache,
+ SLAB_NOFS);
+ if (likely(ni != NULL)) {
+ ni->state = 0;
+ return VFS_I(ni);
+ }
+ ntfs_error(sb, "Allocation of NTFS big inode structure failed.");
+ return NULL;
+}
+
+void ntfs_destroy_big_inode(struct inode *inode)
+{
+ ntfs_inode *ni = NTFS_I(inode);
+
+ ntfs_debug("Entering.");
+ BUG_ON(ni->page);
+ if (!atomic_dec_and_test(&ni->count))
+ BUG();
+ kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
+}
+
+static inline ntfs_inode *ntfs_alloc_extent_inode(void)
+{
+ ntfs_inode *ni;
+
+ ntfs_debug("Entering.");
+ ni = (ntfs_inode *)kmem_cache_alloc(ntfs_inode_cache, SLAB_NOFS);
+ if (likely(ni != NULL)) {
+ ni->state = 0;
+ return ni;
+ }
+ ntfs_error(NULL, "Allocation of NTFS inode structure failed.");
+ return NULL;
+}
+
+static void ntfs_destroy_extent_inode(ntfs_inode *ni)
+{
+ ntfs_debug("Entering.");
+ BUG_ON(ni->page);
+ if (!atomic_dec_and_test(&ni->count))
+ BUG();
+ kmem_cache_free(ntfs_inode_cache, ni);
+}
+
+/**
+ * __ntfs_init_inode - initialize ntfs specific part of an inode
+ * @sb: super block of mounted volume
+ * @ni: freshly allocated ntfs inode which to initialize
+ *
+ * Initialize an ntfs inode to defaults.
+ *
+ * NOTE: ni->mft_no, ni->state, ni->type, ni->name, and ni->name_len are left
+ * untouched. Make sure to initialize them elsewhere.
+ *
+ * Return zero on success and -ENOMEM on error.
+ */
+void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
+{
+ ntfs_debug("Entering.");
+ ni->initialized_size = ni->allocated_size = 0;
+ ni->seq_no = 0;
+ atomic_set(&ni->count, 1);
+ ni->vol = NTFS_SB(sb);
+ ntfs_init_runlist(&ni->runlist);
+ init_MUTEX(&ni->mrec_lock);
+ ni->page = NULL;
+ ni->page_ofs = 0;
+ ni->attr_list_size = 0;
+ ni->attr_list = NULL;
+ ntfs_init_runlist(&ni->attr_list_rl);
+ ni->itype.index.bmp_ino = NULL;
+ ni->itype.index.block_size = 0;
+ ni->itype.index.vcn_size = 0;
+ ni->itype.index.collation_rule = 0;
+ ni->itype.index.block_size_bits = 0;
+ ni->itype.index.vcn_size_bits = 0;
+ init_MUTEX(&ni->extent_lock);
+ ni->nr_extents = 0;
+ ni->ext.base_ntfs_ino = NULL;
+}
+
+inline ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
+ unsigned long mft_no)
+{
+ ntfs_inode *ni = ntfs_alloc_extent_inode();
+
+ ntfs_debug("Entering.");
+ if (likely(ni != NULL)) {
+ __ntfs_init_inode(sb, ni);
+ ni->mft_no = mft_no;
+ ni->type = AT_UNUSED;
+ ni->name = NULL;
+ ni->name_len = 0;
+ }
+ return ni;
+}
+
+/**
+ * ntfs_is_extended_system_file - check if a file is in the $Extend directory
+ * @ctx: initialized attribute search context
+ *
+ * Search all file name attributes in the inode described by the attribute
+ * search context @ctx and check if any of the names are in the $Extend system
+ * directory.
+ *
+ * Return values:
+ * 1: file is in $Extend directory
+ * 0: file is not in $Extend directory
+ * -errno: failed to determine if the file is in the $Extend directory
+ */
+static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx)
+{
+ int nr_links, err;
+
+ /* Restart search. */
+ ntfs_attr_reinit_search_ctx(ctx);
+
+ /* Get number of hard links. */
+ nr_links = le16_to_cpu(ctx->mrec->link_count);
+
+ /* Loop through all hard links. */
+ while (!(err = ntfs_attr_lookup(AT_FILE_NAME, NULL, 0, 0, 0, NULL, 0,
+ ctx))) {
+ FILE_NAME_ATTR *file_name_attr;
+ ATTR_RECORD *attr = ctx->attr;
+ u8 *p, *p2;
+
+ nr_links--;
+ /*
+ * Maximum sanity checking as we are called on an inode that
+ * we suspect might be corrupt.
+ */
+ p = (u8*)attr + le32_to_cpu(attr->length);
+ if (p < (u8*)ctx->mrec || (u8*)p > (u8*)ctx->mrec +
+ le32_to_cpu(ctx->mrec->bytes_in_use)) {
+err_corrupt_attr:
+ ntfs_error(ctx->ntfs_ino->vol->sb, "Corrupt file name "
+ "attribute. You should run chkdsk.");
+ return -EIO;
+ }
+ if (attr->non_resident) {
+ ntfs_error(ctx->ntfs_ino->vol->sb, "Non-resident file "
+ "name. You should run chkdsk.");
+ return -EIO;
+ }
+ if (attr->flags) {
+ ntfs_error(ctx->ntfs_ino->vol->sb, "File name with "
+ "invalid flags. You should run "
+ "chkdsk.");
+ return -EIO;
+ }
+ if (!(attr->data.resident.flags & RESIDENT_ATTR_IS_INDEXED)) {
+ ntfs_error(ctx->ntfs_ino->vol->sb, "Unindexed file "
+ "name. You should run chkdsk.");
+ return -EIO;
+ }
+ file_name_attr = (FILE_NAME_ATTR*)((u8*)attr +
+ le16_to_cpu(attr->data.resident.value_offset));
+ p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length);
+ if (p2 < (u8*)attr || p2 > p)
+ goto err_corrupt_attr;
+ /* This attribute is ok, but is it in the $Extend directory? */
+ if (MREF_LE(file_name_attr->parent_directory) == FILE_Extend)
+ return 1; /* YES, it's an extended system file. */
+ }
+ if (unlikely(err != -ENOENT))
+ return err;
+ if (unlikely(nr_links)) {
+ ntfs_error(ctx->ntfs_ino->vol->sb, "Inode hard link count "
+ "doesn't match number of name attributes. You "
+ "should run chkdsk.");
+ return -EIO;
+ }
+ return 0; /* NO, it is not an extended system file. */
+}
+
+/**
+ * ntfs_read_locked_inode - read an inode from its device
+ * @vi: inode to read
+ *
+ * ntfs_read_locked_inode() is called from ntfs_iget() to read the inode
+ * described by @vi into memory from the device.
+ *
+ * The only fields in @vi that we need to/can look at when the function is
+ * called are i_sb, pointing to the mounted device's super block, and i_ino,
+ * the number of the inode to load.
+ *
+ * ntfs_read_locked_inode() maps, pins and locks the mft record number i_ino
+ * for reading and sets up the necessary @vi fields as well as initializing
+ * the ntfs inode.
+ *
+ * Q: What locks are held when the function is called?
+ * A: i_state has I_LOCK set, hence the inode is locked, also
+ * i_count is set to 1, so it is not going to go away
+ * i_flags is set to 0 and we have no business touching it. Only an ioctl()
+ * is allowed to write to them. We should of course be honouring them but
+ * we need to do that using the IS_* macros defined in include/linux/fs.h.
+ * In any case ntfs_read_locked_inode() has nothing to do with i_flags.
+ *
+ * Return 0 on success and -errno on error. In the error case, the inode will
+ * have had make_bad_inode() executed on it.
+ */
+static int ntfs_read_locked_inode(struct inode *vi)
+{
+ ntfs_volume *vol = NTFS_SB(vi->i_sb);
+ ntfs_inode *ni;
+ MFT_RECORD *m;
+ STANDARD_INFORMATION *si;
+ ntfs_attr_search_ctx *ctx;
+ int err = 0;
+
+ ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
+
+ /* Setup the generic vfs inode parts now. */
+
+ /* This is the optimal IO size (for stat), not the fs block size. */
+ vi->i_blksize = PAGE_CACHE_SIZE;
+ /*
+ * This is for checking whether an inode has changed w.r.t. a file so
+ * that the file can be updated if necessary (compare with f_version).
+ */
+ vi->i_version = 1;
+
+ vi->i_uid = vol->uid;
+ vi->i_gid = vol->gid;
+ vi->i_mode = 0;
+
+ /*
+ * Initialize the ntfs specific part of @vi special casing
+ * FILE_MFT which we need to do at mount time.
+ */
+ if (vi->i_ino != FILE_MFT)
+ ntfs_init_big_inode(vi);
+ ni = NTFS_I(vi);
+
+ m = map_mft_record(ni);
+ if (IS_ERR(m)) {
+ err = PTR_ERR(m);
+ goto err_out;
+ }
+ ctx = ntfs_attr_get_search_ctx(ni, m);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto unm_err_out;
+ }
+
+ if (!(m->flags & MFT_RECORD_IN_USE)) {
+ ntfs_error(vi->i_sb, "Inode is not in use!");
+ goto unm_err_out;
+ }
+ if (m->base_mft_record) {
+ ntfs_error(vi->i_sb, "Inode is an extent inode!");
+ goto unm_err_out;
+ }
+
+ /* Transfer information from mft record into vfs and ntfs inodes. */
+ vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
+
+ /*
+ * FIXME: Keep in mind that link_count is two for files which have both
+ * a long file name and a short file name as separate entries, so if
+ * we are hiding short file names this will be too high. Either we need
+ * to account for the short file names by subtracting them or we need
+ * to make sure we delete files even though i_nlink is not zero which
+ * might be tricky due to vfs interactions. Need to think about this
+ * some more when implementing the unlink command.
+ */
+ vi->i_nlink = le16_to_cpu(m->link_count);
+ /*
+ * FIXME: Reparse points can have the directory bit set even though
+ * they would be S_IFLNK. Need to deal with this further below when we
+ * implement reparse points / symbolic links but it will do for now.
+ * Also if not a directory, it could be something else, rather than
+ * a regular file. But again, will do for now.
+ */
+ /* Everyone gets all permissions. */
+ vi->i_mode |= S_IRWXUGO;
+ /* If read-only, noone gets write permissions. */
+ if (IS_RDONLY(vi))
+ vi->i_mode &= ~S_IWUGO;
+ if (m->flags & MFT_RECORD_IS_DIRECTORY) {
+ vi->i_mode |= S_IFDIR;
+ /*
+ * Apply the directory permissions mask set in the mount
+ * options.
+ */
+ vi->i_mode &= ~vol->dmask;
+ /* Things break without this kludge! */
+ if (vi->i_nlink > 1)
+ vi->i_nlink = 1;
+ } else {
+ vi->i_mode |= S_IFREG;
+ /* Apply the file permissions mask set in the mount options. */
+ vi->i_mode &= ~vol->fmask;
+ }
+ /*
+ * Find the standard information attribute in the mft record. At this
+ * stage we haven't setup the attribute list stuff yet, so this could
+ * in fact fail if the standard information is in an extent record, but
+ * I don't think this actually ever happens.
+ */
+ err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0, 0, 0, NULL, 0,
+ ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT) {
+ /*
+ * TODO: We should be performing a hot fix here (if the
+ * recover mount option is set) by creating a new
+ * attribute.
+ */
+ ntfs_error(vi->i_sb, "$STANDARD_INFORMATION attribute "
+ "is missing.");
+ }
+ goto unm_err_out;
+ }
+ /* Get the standard information attribute value. */
+ si = (STANDARD_INFORMATION*)((char*)ctx->attr +
+ le16_to_cpu(ctx->attr->data.resident.value_offset));
+
+ /* Transfer information from the standard information into vi. */
+ /*
+ * Note: The i_?times do not quite map perfectly onto the NTFS times,
+ * but they are close enough, and in the end it doesn't really matter
+ * that much...
+ */
+ /*
+ * mtime is the last change of the data within the file. Not changed
+ * when only metadata is changed, e.g. a rename doesn't affect mtime.
+ */
+ vi->i_mtime = ntfs2utc(si->last_data_change_time);
+ /*
+ * ctime is the last change of the metadata of the file. This obviously
+ * always changes, when mtime is changed. ctime can be changed on its
+ * own, mtime is then not changed, e.g. when a file is renamed.
+ */
+ vi->i_ctime = ntfs2utc(si->last_mft_change_time);
+ /*
+ * Last access to the data within the file. Not changed during a rename
+ * for example but changed whenever the file is written to.
+ */
+ vi->i_atime = ntfs2utc(si->last_access_time);
+
+ /* Find the attribute list attribute if present. */
+ ntfs_attr_reinit_search_ctx(ctx);
+ err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
+ if (err) {
+ if (unlikely(err != -ENOENT)) {
+ ntfs_error(vi->i_sb, "Failed to lookup attribute list "
+ "attribute.");
+ goto unm_err_out;
+ }
+ } else /* if (!err) */ {
+ if (vi->i_ino == FILE_MFT)
+ goto skip_attr_list_load;
+ ntfs_debug("Attribute list found in inode 0x%lx.", vi->i_ino);
+ NInoSetAttrList(ni);
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED ||
+ ctx->attr->flags & ATTR_COMPRESSION_MASK ||
+ ctx->attr->flags & ATTR_IS_SPARSE) {
+ ntfs_error(vi->i_sb, "Attribute list attribute is "
+ "compressed/encrypted/sparse.");
+ goto unm_err_out;
+ }
+ /* Now allocate memory for the attribute list. */
+ ni->attr_list_size = (u32)ntfs_attr_size(ctx->attr);
+ ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
+ if (!ni->attr_list) {
+ ntfs_error(vi->i_sb, "Not enough memory to allocate "
+ "buffer for attribute list.");
+ err = -ENOMEM;
+ goto unm_err_out;
+ }
+ if (ctx->attr->non_resident) {
+ NInoSetAttrListNonResident(ni);
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(vi->i_sb, "Attribute list has non "
+ "zero lowest_vcn.");
+ goto unm_err_out;
+ }
+ /*
+ * Setup the runlist. No need for locking as we have
+ * exclusive access to the inode at this time.
+ */
+ ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
+ ctx->attr, NULL);
+ if (IS_ERR(ni->attr_list_rl.rl)) {
+ err = PTR_ERR(ni->attr_list_rl.rl);
+ ni->attr_list_rl.rl = NULL;
+ ntfs_error(vi->i_sb, "Mapping pairs "
+ "decompression failed.");
+ goto unm_err_out;
+ }
+ /* Now load the attribute list. */
+ if ((err = load_attribute_list(vol, &ni->attr_list_rl,
+ ni->attr_list, ni->attr_list_size,
+ sle64_to_cpu(ctx->attr->data.
+ non_resident.initialized_size)))) {
+ ntfs_error(vi->i_sb, "Failed to load "
+ "attribute list attribute.");
+ goto unm_err_out;
+ }
+ } else /* if (!ctx.attr->non_resident) */ {
+ if ((u8*)ctx->attr + le16_to_cpu(
+ ctx->attr->data.resident.value_offset) +
+ le32_to_cpu(
+ ctx->attr->data.resident.value_length) >
+ (u8*)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(vi->i_sb, "Corrupt attribute list "
+ "in inode.");
+ goto unm_err_out;
+ }
+ /* Now copy the attribute list. */
+ memcpy(ni->attr_list, (u8*)ctx->attr + le16_to_cpu(
+ ctx->attr->data.resident.value_offset),
+ le32_to_cpu(
+ ctx->attr->data.resident.value_length));
+ }
+ }
+skip_attr_list_load:
+ /*
+ * If an attribute list is present we now have the attribute list value
+ * in ntfs_ino->attr_list and it is ntfs_ino->attr_list_size bytes.
+ */
+ if (S_ISDIR(vi->i_mode)) {
+ struct inode *bvi;
+ ntfs_inode *bni;
+ INDEX_ROOT *ir;
+ char *ir_end, *index_end;
+
+ /* It is a directory, find index root attribute. */
+ ntfs_attr_reinit_search_ctx(ctx);
+ err = ntfs_attr_lookup(AT_INDEX_ROOT, I30, 4, CASE_SENSITIVE,
+ 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT) {
+ // FIXME: File is corrupt! Hot-fix with empty
+ // index root attribute if recovery option is
+ // set.
+ ntfs_error(vi->i_sb, "$INDEX_ROOT attribute "
+ "is missing.");
+ }
+ goto unm_err_out;
+ }
+ /* Set up the state. */
+ if (unlikely(ctx->attr->non_resident)) {
+ ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
+ "resident.");
+ goto unm_err_out;
+ }
+ /* Ensure the attribute name is placed before the value. */
+ if (unlikely(ctx->attr->name_length &&
+ (le16_to_cpu(ctx->attr->name_offset) >=
+ le16_to_cpu(ctx->attr->data.resident.
+ value_offset)))) {
+ ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
+ "placed after the attribute value.");
+ goto unm_err_out;
+ }
+ /*
+ * Compressed/encrypted index root just means that the newly
+ * created files in that directory should be created compressed/
+ * encrypted. However index root cannot be both compressed and
+ * encrypted.
+ */
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK)
+ NInoSetCompressed(ni);
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED) {
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ ntfs_error(vi->i_sb, "Found encrypted and "
+ "compressed attribute.");
+ goto unm_err_out;
+ }
+ NInoSetEncrypted(ni);
+ }
+ if (ctx->attr->flags & ATTR_IS_SPARSE)
+ NInoSetSparse(ni);
+ ir = (INDEX_ROOT*)((char*)ctx->attr + le16_to_cpu(
+ ctx->attr->data.resident.value_offset));
+ ir_end = (char*)ir + le32_to_cpu(
+ ctx->attr->data.resident.value_length);
+ if (ir_end > (char*)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
+ "corrupt.");
+ goto unm_err_out;
+ }
+ index_end = (char*)&ir->index +
+ le32_to_cpu(ir->index.index_length);
+ if (index_end > ir_end) {
+ ntfs_error(vi->i_sb, "Directory index is corrupt.");
+ goto unm_err_out;
+ }
+ if (ir->type != AT_FILE_NAME) {
+ ntfs_error(vi->i_sb, "Indexed attribute is not "
+ "$FILE_NAME.");
+ goto unm_err_out;
+ }
+ if (ir->collation_rule != COLLATION_FILE_NAME) {
+ ntfs_error(vi->i_sb, "Index collation rule is not "
+ "COLLATION_FILE_NAME.");
+ goto unm_err_out;
+ }
+ ni->itype.index.collation_rule = ir->collation_rule;
+ ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
+ if (ni->itype.index.block_size &
+ (ni->itype.index.block_size - 1)) {
+ ntfs_error(vi->i_sb, "Index block size (%u) is not a "
+ "power of two.",
+ ni->itype.index.block_size);
+ goto unm_err_out;
+ }
+ if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
+ ntfs_error(vi->i_sb, "Index block size (%u) > "
+ "PAGE_CACHE_SIZE (%ld) is not "
+ "supported. Sorry.",
+ ni->itype.index.block_size,
+ PAGE_CACHE_SIZE);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
+ ntfs_error(vi->i_sb, "Index block size (%u) < "
+ "NTFS_BLOCK_SIZE (%i) is not "
+ "supported. Sorry.",
+ ni->itype.index.block_size,
+ NTFS_BLOCK_SIZE);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ ni->itype.index.block_size_bits =
+ ffs(ni->itype.index.block_size) - 1;
+ /* Determine the size of a vcn in the directory index. */
+ if (vol->cluster_size <= ni->itype.index.block_size) {
+ ni->itype.index.vcn_size = vol->cluster_size;
+ ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
+ } else {
+ ni->itype.index.vcn_size = vol->sector_size;
+ ni->itype.index.vcn_size_bits = vol->sector_size_bits;
+ }
+
+ /* Setup the index allocation attribute, even if not present. */
+ NInoSetMstProtected(ni);
+ ni->type = AT_INDEX_ALLOCATION;
+ ni->name = I30;
+ ni->name_len = 4;
+
+ if (!(ir->index.flags & LARGE_INDEX)) {
+ /* No index allocation. */
+ vi->i_size = ni->initialized_size =
+ ni->allocated_size = 0;
+ /* We are done with the mft record, so we release it. */
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(ni);
+ m = NULL;
+ ctx = NULL;
+ goto skip_large_dir_stuff;
+ } /* LARGE_INDEX: Index allocation present. Setup state. */
+ NInoSetIndexAllocPresent(ni);
+ /* Find index allocation attribute. */
+ ntfs_attr_reinit_search_ctx(ctx);
+ err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT)
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION "
+ "attribute is not present but "
+ "$INDEX_ROOT indicated it is.");
+ else
+ ntfs_error(vi->i_sb, "Failed to lookup "
+ "$INDEX_ALLOCATION "
+ "attribute.");
+ goto unm_err_out;
+ }
+ if (!ctx->attr->non_resident) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
+ "is resident.");
+ goto unm_err_out;
+ }
+ /*
+ * Ensure the attribute name is placed before the mapping pairs
+ * array.
+ */
+ if (unlikely(ctx->attr->name_length &&
+ (le16_to_cpu(ctx->attr->name_offset) >=
+ le16_to_cpu(ctx->attr->data.non_resident.
+ mapping_pairs_offset)))) {
+ ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
+ "is placed after the mapping pairs "
+ "array.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
+ "is encrypted.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_IS_SPARSE) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
+ "is sparse.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
+ "is compressed.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(vi->i_sb, "First extent of "
+ "$INDEX_ALLOCATION attribute has non "
+ "zero lowest_vcn.");
+ goto unm_err_out;
+ }
+ vi->i_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.data_size);
+ ni->initialized_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.initialized_size);
+ ni->allocated_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.allocated_size);
+ /*
+ * We are done with the mft record, so we release it. Otherwise
+ * we would deadlock in ntfs_attr_iget().
+ */
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(ni);
+ m = NULL;
+ ctx = NULL;
+ /* Get the index bitmap attribute inode. */
+ bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4);
+ if (IS_ERR(bvi)) {
+ ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
+ err = PTR_ERR(bvi);
+ goto unm_err_out;
+ }
+ ni->itype.index.bmp_ino = bvi;
+ bni = NTFS_I(bvi);
+ if (NInoCompressed(bni) || NInoEncrypted(bni) ||
+ NInoSparse(bni)) {
+ ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
+ "and/or encrypted and/or sparse.");
+ goto unm_err_out;
+ }
+ /* Consistency check bitmap size vs. index allocation size. */
+ if ((bvi->i_size << 3) < (vi->i_size >>
+ ni->itype.index.block_size_bits)) {
+ ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
+ "for index allocation (0x%llx).",
+ bvi->i_size << 3, vi->i_size);
+ goto unm_err_out;
+ }
+skip_large_dir_stuff:
+ /* Setup the operations for this inode. */
+ vi->i_op = &ntfs_dir_inode_ops;
+ vi->i_fop = &ntfs_dir_ops;
+ } else {
+ /* It is a file. */
+ ntfs_attr_reinit_search_ctx(ctx);
+
+ /* Setup the data attribute, even if not present. */
+ ni->type = AT_DATA;
+ ni->name = NULL;
+ ni->name_len = 0;
+
+ /* Find first extent of the unnamed data attribute. */
+ err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ vi->i_size = ni->initialized_size =
+ ni->allocated_size = 0;
+ if (err != -ENOENT) {
+ ntfs_error(vi->i_sb, "Failed to lookup $DATA "
+ "attribute.");
+ goto unm_err_out;
+ }
+ /*
+ * FILE_Secure does not have an unnamed $DATA
+ * attribute, so we special case it here.
+ */
+ if (vi->i_ino == FILE_Secure)
+ goto no_data_attr_special_case;
+ /*
+ * Most if not all the system files in the $Extend
+ * system directory do not have unnamed data
+ * attributes so we need to check if the parent
+ * directory of the file is FILE_Extend and if it is
+ * ignore this error. To do this we need to get the
+ * name of this inode from the mft record as the name
+ * contains the back reference to the parent directory.
+ */
+ if (ntfs_is_extended_system_file(ctx) > 0)
+ goto no_data_attr_special_case;
+ // FIXME: File is corrupt! Hot-fix with empty data
+ // attribute if recovery option is set.
+ ntfs_error(vi->i_sb, "$DATA attribute is missing.");
+ goto unm_err_out;
+ }
+ /* Setup the state. */
+ if (ctx->attr->non_resident) {
+ NInoSetNonResident(ni);
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ NInoSetCompressed(ni);
+ if (vol->cluster_size > 4096) {
+ ntfs_error(vi->i_sb, "Found "
+ "compressed data but "
+ "compression is disabled due "
+ "to cluster size (%i) > 4kiB.",
+ vol->cluster_size);
+ goto unm_err_out;
+ }
+ if ((ctx->attr->flags & ATTR_COMPRESSION_MASK)
+ != ATTR_IS_COMPRESSED) {
+ ntfs_error(vi->i_sb, "Found "
+ "unknown compression method or "
+ "corrupt file.");
+ goto unm_err_out;
+ }
+ ni->itype.compressed.block_clusters = 1U <<
+ ctx->attr->data.non_resident.
+ compression_unit;
+ if (ctx->attr->data.non_resident.
+ compression_unit != 4) {
+ ntfs_error(vi->i_sb, "Found "
+ "nonstandard compression unit "
+ "(%u instead of 4). Cannot "
+ "handle this.",
+ ctx->attr->data.non_resident.
+ compression_unit);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ ni->itype.compressed.block_size = 1U << (
+ ctx->attr->data.non_resident.
+ compression_unit +
+ vol->cluster_size_bits);
+ ni->itype.compressed.block_size_bits = ffs(
+ ni->itype.compressed.block_size) - 1;
+ }
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED) {
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ ntfs_error(vi->i_sb, "Found encrypted "
+ "and compressed data.");
+ goto unm_err_out;
+ }
+ NInoSetEncrypted(ni);
+ }
+ if (ctx->attr->flags & ATTR_IS_SPARSE)
+ NInoSetSparse(ni);
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(vi->i_sb, "First extent of $DATA "
+ "attribute has non zero "
+ "lowest_vcn.");
+ goto unm_err_out;
+ }
+ /* Setup all the sizes. */
+ vi->i_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.data_size);
+ ni->initialized_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.
+ initialized_size);
+ ni->allocated_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.
+ allocated_size);
+ if (NInoCompressed(ni)) {
+ ni->itype.compressed.size = sle64_to_cpu(
+ ctx->attr->data.non_resident.
+ compressed_size);
+ }
+ } else { /* Resident attribute. */
+ /*
+ * Make all sizes equal for simplicity in read code
+ * paths. FIXME: Need to keep this in mind when
+ * converting to non-resident attribute in write code
+ * path. (Probably only affects truncate().)
+ */
+ vi->i_size = ni->initialized_size = ni->allocated_size =
+ le32_to_cpu(
+ ctx->attr->data.resident.value_length);
+ }
+no_data_attr_special_case:
+ /* We are done with the mft record, so we release it. */
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(ni);
+ m = NULL;
+ ctx = NULL;
+ /* Setup the operations for this inode. */
+ vi->i_op = &ntfs_file_inode_ops;
+ vi->i_fop = &ntfs_file_ops;
+ }
+ if (NInoMstProtected(ni))
+ vi->i_mapping->a_ops = &ntfs_mst_aops;
+ else
+ vi->i_mapping->a_ops = &ntfs_aops;
+ /*
+ * The number of 512-byte blocks used on disk (for stat). This is in so
+ * far inaccurate as it doesn't account for any named streams or other
+ * special non-resident attributes, but that is how Windows works, too,
+ * so we are at least consistent with Windows, if not entirely
+ * consistent with the Linux Way. Doing it the Linux Way would cause a
+ * significant slowdown as it would involve iterating over all
+ * attributes in the mft record and adding the allocated/compressed
+ * sizes of all non-resident attributes present to give us the Linux
+ * correct size that should go into i_blocks (after division by 512).
+ */
+ if (S_ISDIR(vi->i_mode) || !NInoCompressed(ni))
+ vi->i_blocks = ni->allocated_size >> 9;
+ else
+ vi->i_blocks = ni->itype.compressed.size >> 9;
+
+ ntfs_debug("Done.");
+ return 0;
+
+unm_err_out:
+ if (!err)
+ err = -EIO;
+ if (ctx)
+ ntfs_attr_put_search_ctx(ctx);
+ if (m)
+ unmap_mft_record(ni);
+err_out:
+ ntfs_error(vol->sb, "Failed with error code %i. Marking corrupt "
+ "inode 0x%lx as bad. Run chkdsk.", err, vi->i_ino);
+ make_bad_inode(vi);
+ if (err != -EOPNOTSUPP && err != -ENOMEM)
+ NVolSetErrors(vol);
+ return err;
+}
+
+/**
+ * ntfs_read_locked_attr_inode - read an attribute inode from its base inode
+ * @base_vi: base inode
+ * @vi: attribute inode to read
+ *
+ * ntfs_read_locked_attr_inode() is called from ntfs_attr_iget() to read the
+ * attribute inode described by @vi into memory from the base mft record
+ * described by @base_ni.
+ *
+ * ntfs_read_locked_attr_inode() maps, pins and locks the base inode for
+ * reading and looks up the attribute described by @vi before setting up the
+ * necessary fields in @vi as well as initializing the ntfs inode.
+ *
+ * Q: What locks are held when the function is called?
+ * A: i_state has I_LOCK set, hence the inode is locked, also
+ * i_count is set to 1, so it is not going to go away
+ *
+ * Return 0 on success and -errno on error. In the error case, the inode will
+ * have had make_bad_inode() executed on it.
+ */
+static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
+{
+ ntfs_volume *vol = NTFS_SB(vi->i_sb);
+ ntfs_inode *ni, *base_ni;
+ MFT_RECORD *m;
+ ntfs_attr_search_ctx *ctx;
+ int err = 0;
+
+ ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
+
+ ntfs_init_big_inode(vi);
+
+ ni = NTFS_I(vi);
+ base_ni = NTFS_I(base_vi);
+
+ /* Just mirror the values from the base inode. */
+ vi->i_blksize = base_vi->i_blksize;
+ vi->i_version = base_vi->i_version;
+ vi->i_uid = base_vi->i_uid;
+ vi->i_gid = base_vi->i_gid;
+ vi->i_nlink = base_vi->i_nlink;
+ vi->i_mtime = base_vi->i_mtime;
+ vi->i_ctime = base_vi->i_ctime;
+ vi->i_atime = base_vi->i_atime;
+ vi->i_generation = ni->seq_no = base_ni->seq_no;
+
+ /* Set inode type to zero but preserve permissions. */
+ vi->i_mode = base_vi->i_mode & ~S_IFMT;
+
+ m = map_mft_record(base_ni);
+ if (IS_ERR(m)) {
+ err = PTR_ERR(m);
+ goto err_out;
+ }
+ ctx = ntfs_attr_get_search_ctx(base_ni, m);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto unm_err_out;
+ }
+
+ /* Find the attribute. */
+ err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err))
+ goto unm_err_out;
+
+ if (!ctx->attr->non_resident) {
+ /* Ensure the attribute name is placed before the value. */
+ if (unlikely(ctx->attr->name_length &&
+ (le16_to_cpu(ctx->attr->name_offset) >=
+ le16_to_cpu(ctx->attr->data.resident.
+ value_offset)))) {
+ ntfs_error(vol->sb, "Attribute name is placed after "
+ "the attribute value.");
+ goto unm_err_out;
+ }
+ if (NInoMstProtected(ni) || ctx->attr->flags) {
+ ntfs_error(vi->i_sb, "Found mst protected attribute "
+ "or attribute with non-zero flags but "
+ "the attribute is resident. Please "
+ "report you saw this message to "
+ "linux-ntfs-dev@lists.sourceforge.net");
+ goto unm_err_out;
+ }
+ /*
+ * Resident attribute. Make all sizes equal for simplicity in
+ * read code paths.
+ */
+ vi->i_size = ni->initialized_size = ni->allocated_size =
+ le32_to_cpu(ctx->attr->data.resident.value_length);
+ } else {
+ NInoSetNonResident(ni);
+ /*
+ * Ensure the attribute name is placed before the mapping pairs
+ * array.
+ */
+ if (unlikely(ctx->attr->name_length &&
+ (le16_to_cpu(ctx->attr->name_offset) >=
+ le16_to_cpu(ctx->attr->data.non_resident.
+ mapping_pairs_offset)))) {
+ ntfs_error(vol->sb, "Attribute name is placed after "
+ "the mapping pairs array.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ if (NInoMstProtected(ni)) {
+ ntfs_error(vi->i_sb, "Found mst protected "
+ "attribute but the attribute "
+ "is compressed. Please report "
+ "you saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ goto unm_err_out;
+ }
+ NInoSetCompressed(ni);
+ if ((ni->type != AT_DATA) || (ni->type == AT_DATA &&
+ ni->name_len)) {
+ ntfs_error(vi->i_sb, "Found compressed "
+ "non-data or named data "
+ "attribute. Please report "
+ "you saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ goto unm_err_out;
+ }
+ if (vol->cluster_size > 4096) {
+ ntfs_error(vi->i_sb, "Found compressed "
+ "attribute but compression is "
+ "disabled due to cluster size "
+ "(%i) > 4kiB.",
+ vol->cluster_size);
+ goto unm_err_out;
+ }
+ if ((ctx->attr->flags & ATTR_COMPRESSION_MASK)
+ != ATTR_IS_COMPRESSED) {
+ ntfs_error(vi->i_sb, "Found unknown "
+ "compression method.");
+ goto unm_err_out;
+ }
+ ni->itype.compressed.block_clusters = 1U <<
+ ctx->attr->data.non_resident.
+ compression_unit;
+ if (ctx->attr->data.non_resident.compression_unit !=
+ 4) {
+ ntfs_error(vi->i_sb, "Found nonstandard "
+ "compression unit (%u instead "
+ "of 4). Cannot handle this.",
+ ctx->attr->data.non_resident.
+ compression_unit);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ ni->itype.compressed.block_size = 1U << (
+ ctx->attr->data.non_resident.
+ compression_unit +
+ vol->cluster_size_bits);
+ ni->itype.compressed.block_size_bits = ffs(
+ ni->itype.compressed.block_size) - 1;
+ }
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED) {
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ ntfs_error(vi->i_sb, "Found encrypted "
+ "and compressed data.");
+ goto unm_err_out;
+ }
+ if (NInoMstProtected(ni)) {
+ ntfs_error(vi->i_sb, "Found mst protected "
+ "attribute but the attribute "
+ "is encrypted. Please report "
+ "you saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ goto unm_err_out;
+ }
+ NInoSetEncrypted(ni);
+ }
+ if (ctx->attr->flags & ATTR_IS_SPARSE) {
+ if (NInoMstProtected(ni)) {
+ ntfs_error(vi->i_sb, "Found mst protected "
+ "attribute but the attribute "
+ "is sparse. Please report "
+ "you saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ goto unm_err_out;
+ }
+ NInoSetSparse(ni);
+ }
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(vi->i_sb, "First extent of attribute has "
+ "non-zero lowest_vcn.");
+ goto unm_err_out;
+ }
+ /* Setup all the sizes. */
+ vi->i_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.data_size);
+ ni->initialized_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.initialized_size);
+ ni->allocated_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.allocated_size);
+ if (NInoCompressed(ni)) {
+ ni->itype.compressed.size = sle64_to_cpu(
+ ctx->attr->data.non_resident.
+ compressed_size);
+ }
+ }
+
+ /* Setup the operations for this attribute inode. */
+ vi->i_op = NULL;
+ vi->i_fop = NULL;
+ if (NInoMstProtected(ni))
+ vi->i_mapping->a_ops = &ntfs_mst_aops;
+ else
+ vi->i_mapping->a_ops = &ntfs_aops;
+
+ if (!NInoCompressed(ni))
+ vi->i_blocks = ni->allocated_size >> 9;
+ else
+ vi->i_blocks = ni->itype.compressed.size >> 9;
+
+ /*
+ * Make sure the base inode doesn't go away and attach it to the
+ * attribute inode.
+ */
+ igrab(base_vi);
+ ni->ext.base_ntfs_ino = base_ni;
+ ni->nr_extents = -1;
+
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(base_ni);
+
+ ntfs_debug("Done.");
+ return 0;
+
+unm_err_out:
+ if (!err)
+ err = -EIO;
+ if (ctx)
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(base_ni);
+err_out:
+ ntfs_error(vol->sb, "Failed with error code %i while reading attribute "
+ "inode (mft_no 0x%lx, type 0x%x, name_len %i). "
+ "Marking corrupt inode and base inode 0x%lx as bad. "
+ "Run chkdsk.", err, vi->i_ino, ni->type, ni->name_len,
+ base_vi->i_ino);
+ make_bad_inode(vi);
+ make_bad_inode(base_vi);
+ if (err != -ENOMEM)
+ NVolSetErrors(vol);
+ return err;
+}
+
+/**
+ * ntfs_read_locked_index_inode - read an index inode from its base inode
+ * @base_vi: base inode
+ * @vi: index inode to read
+ *
+ * ntfs_read_locked_index_inode() is called from ntfs_index_iget() to read the
+ * index inode described by @vi into memory from the base mft record described
+ * by @base_ni.
+ *
+ * ntfs_read_locked_index_inode() maps, pins and locks the base inode for
+ * reading and looks up the attributes relating to the index described by @vi
+ * before setting up the necessary fields in @vi as well as initializing the
+ * ntfs inode.
+ *
+ * Note, index inodes are essentially attribute inodes (NInoAttr() is true)
+ * with the attribute type set to AT_INDEX_ALLOCATION. Apart from that, they
+ * are setup like directory inodes since directories are a special case of
+ * indices ao they need to be treated in much the same way. Most importantly,
+ * for small indices the index allocation attribute might not actually exist.
+ * However, the index root attribute always exists but this does not need to
+ * have an inode associated with it and this is why we define a new inode type
+ * index. Also, like for directories, we need to have an attribute inode for
+ * the bitmap attribute corresponding to the index allocation attribute and we
+ * can store this in the appropriate field of the inode, just like we do for
+ * normal directory inodes.
+ *
+ * Q: What locks are held when the function is called?
+ * A: i_state has I_LOCK set, hence the inode is locked, also
+ * i_count is set to 1, so it is not going to go away
+ *
+ * Return 0 on success and -errno on error. In the error case, the inode will
+ * have had make_bad_inode() executed on it.
+ */
+static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
+{
+ ntfs_volume *vol = NTFS_SB(vi->i_sb);
+ ntfs_inode *ni, *base_ni, *bni;
+ struct inode *bvi;
+ MFT_RECORD *m;
+ ntfs_attr_search_ctx *ctx;
+ INDEX_ROOT *ir;
+ u8 *ir_end, *index_end;
+ int err = 0;
+
+ ntfs_debug("Entering for i_ino 0x%lx.", vi->i_ino);
+ ntfs_init_big_inode(vi);
+ ni = NTFS_I(vi);
+ base_ni = NTFS_I(base_vi);
+ /* Just mirror the values from the base inode. */
+ vi->i_blksize = base_vi->i_blksize;
+ vi->i_version = base_vi->i_version;
+ vi->i_uid = base_vi->i_uid;
+ vi->i_gid = base_vi->i_gid;
+ vi->i_nlink = base_vi->i_nlink;
+ vi->i_mtime = base_vi->i_mtime;
+ vi->i_ctime = base_vi->i_ctime;
+ vi->i_atime = base_vi->i_atime;
+ vi->i_generation = ni->seq_no = base_ni->seq_no;
+ /* Set inode type to zero but preserve permissions. */
+ vi->i_mode = base_vi->i_mode & ~S_IFMT;
+ /* Map the mft record for the base inode. */
+ m = map_mft_record(base_ni);
+ if (IS_ERR(m)) {
+ err = PTR_ERR(m);
+ goto err_out;
+ }
+ ctx = ntfs_attr_get_search_ctx(base_ni, m);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto unm_err_out;
+ }
+ /* Find the index root attribute. */
+ err = ntfs_attr_lookup(AT_INDEX_ROOT, ni->name, ni->name_len,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT)
+ ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is "
+ "missing.");
+ goto unm_err_out;
+ }
+ /* Set up the state. */
+ if (unlikely(ctx->attr->non_resident)) {
+ ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
+ goto unm_err_out;
+ }
+ /* Ensure the attribute name is placed before the value. */
+ if (unlikely(ctx->attr->name_length &&
+ (le16_to_cpu(ctx->attr->name_offset) >=
+ le16_to_cpu(ctx->attr->data.resident.
+ value_offset)))) {
+ ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
+ "after the attribute value.");
+ goto unm_err_out;
+ }
+ /* Compressed/encrypted/sparse index root is not allowed. */
+ if (ctx->attr->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
+ ATTR_IS_SPARSE)) {
+ ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
+ "root attribute.");
+ goto unm_err_out;
+ }
+ ir = (INDEX_ROOT*)((u8*)ctx->attr +
+ le16_to_cpu(ctx->attr->data.resident.value_offset));
+ ir_end = (u8*)ir + le32_to_cpu(ctx->attr->data.resident.value_length);
+ if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(vi->i_sb, "$INDEX_ROOT attribute is corrupt.");
+ goto unm_err_out;
+ }
+ index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
+ if (index_end > ir_end) {
+ ntfs_error(vi->i_sb, "Index is corrupt.");
+ goto unm_err_out;
+ }
+ if (ir->type) {
+ ntfs_error(vi->i_sb, "Index type is not 0 (type is 0x%x).",
+ le32_to_cpu(ir->type));
+ goto unm_err_out;
+ }
+ ni->itype.index.collation_rule = ir->collation_rule;
+ ntfs_debug("Index collation rule is 0x%x.",
+ le32_to_cpu(ir->collation_rule));
+ ni->itype.index.block_size = le32_to_cpu(ir->index_block_size);
+ if (ni->itype.index.block_size & (ni->itype.index.block_size - 1)) {
+ ntfs_error(vi->i_sb, "Index block size (%u) is not a power of "
+ "two.", ni->itype.index.block_size);
+ goto unm_err_out;
+ }
+ if (ni->itype.index.block_size > PAGE_CACHE_SIZE) {
+ ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE "
+ "(%ld) is not supported. Sorry.",
+ ni->itype.index.block_size, PAGE_CACHE_SIZE);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) {
+ ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE "
+ "(%i) is not supported. Sorry.",
+ ni->itype.index.block_size, NTFS_BLOCK_SIZE);
+ err = -EOPNOTSUPP;
+ goto unm_err_out;
+ }
+ ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1;
+ /* Determine the size of a vcn in the index. */
+ if (vol->cluster_size <= ni->itype.index.block_size) {
+ ni->itype.index.vcn_size = vol->cluster_size;
+ ni->itype.index.vcn_size_bits = vol->cluster_size_bits;
+ } else {
+ ni->itype.index.vcn_size = vol->sector_size;
+ ni->itype.index.vcn_size_bits = vol->sector_size_bits;
+ }
+ /* Check for presence of index allocation attribute. */
+ if (!(ir->index.flags & LARGE_INDEX)) {
+ /* No index allocation. */
+ vi->i_size = ni->initialized_size = ni->allocated_size = 0;
+ /* We are done with the mft record, so we release it. */
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(base_ni);
+ m = NULL;
+ ctx = NULL;
+ goto skip_large_index_stuff;
+ } /* LARGE_INDEX: Index allocation present. Setup state. */
+ NInoSetIndexAllocPresent(ni);
+ /* Find index allocation attribute. */
+ ntfs_attr_reinit_search_ctx(ctx);
+ err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT)
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
+ "not present but $INDEX_ROOT "
+ "indicated it is.");
+ else
+ ntfs_error(vi->i_sb, "Failed to lookup "
+ "$INDEX_ALLOCATION attribute.");
+ goto unm_err_out;
+ }
+ if (!ctx->attr->non_resident) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
+ "resident.");
+ goto unm_err_out;
+ }
+ /*
+ * Ensure the attribute name is placed before the mapping pairs array.
+ */
+ if (unlikely(ctx->attr->name_length && (le16_to_cpu(
+ ctx->attr->name_offset) >= le16_to_cpu(
+ ctx->attr->data.non_resident.mapping_pairs_offset)))) {
+ ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
+ "placed after the mapping pairs array.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
+ "encrypted.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_IS_SPARSE) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->flags & ATTR_COMPRESSION_MASK) {
+ ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
+ "compressed.");
+ goto unm_err_out;
+ }
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
+ "attribute has non zero lowest_vcn.");
+ goto unm_err_out;
+ }
+ vi->i_size = sle64_to_cpu(ctx->attr->data.non_resident.data_size);
+ ni->initialized_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.initialized_size);
+ ni->allocated_size = sle64_to_cpu(
+ ctx->attr->data.non_resident.allocated_size);
+ /*
+ * We are done with the mft record, so we release it. Otherwise
+ * we would deadlock in ntfs_attr_iget().
+ */
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(base_ni);
+ m = NULL;
+ ctx = NULL;
+ /* Get the index bitmap attribute inode. */
+ bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
+ if (IS_ERR(bvi)) {
+ ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
+ err = PTR_ERR(bvi);
+ goto unm_err_out;
+ }
+ bni = NTFS_I(bvi);
+ if (NInoCompressed(bni) || NInoEncrypted(bni) ||
+ NInoSparse(bni)) {
+ ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
+ "encrypted and/or sparse.");
+ goto iput_unm_err_out;
+ }
+ /* Consistency check bitmap size vs. index allocation size. */
+ if ((bvi->i_size << 3) < (vi->i_size >>
+ ni->itype.index.block_size_bits)) {
+ ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) for "
+ "index allocation (0x%llx).", bvi->i_size << 3,
+ vi->i_size);
+ goto iput_unm_err_out;
+ }
+ ni->itype.index.bmp_ino = bvi;
+skip_large_index_stuff:
+ /* Setup the operations for this index inode. */
+ vi->i_op = NULL;
+ vi->i_fop = NULL;
+ vi->i_mapping->a_ops = &ntfs_mst_aops;
+ vi->i_blocks = ni->allocated_size >> 9;
+
+ /*
+ * Make sure the base inode doesn't go away and attach it to the
+ * index inode.
+ */
+ igrab(base_vi);
+ ni->ext.base_ntfs_ino = base_ni;
+ ni->nr_extents = -1;
+
+ ntfs_debug("Done.");
+ return 0;
+
+iput_unm_err_out:
+ iput(bvi);
+unm_err_out:
+ if (!err)
+ err = -EIO;
+ if (ctx)
+ ntfs_attr_put_search_ctx(ctx);
+ if (m)
+ unmap_mft_record(base_ni);
+err_out:
+ ntfs_error(vi->i_sb, "Failed with error code %i while reading index "
+ "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino,
+ ni->name_len);
+ make_bad_inode(vi);
+ if (err != -EOPNOTSUPP && err != -ENOMEM)
+ NVolSetErrors(vol);
+ return err;
+}
+
+/**
+ * ntfs_read_inode_mount - special read_inode for mount time use only
+ * @vi: inode to read
+ *
+ * Read inode FILE_MFT at mount time, only called with super_block lock
+ * held from within the read_super() code path.
+ *
+ * This function exists because when it is called the page cache for $MFT/$DATA
+ * is not initialized and hence we cannot get at the contents of mft records
+ * by calling map_mft_record*().
+ *
+ * Further it needs to cope with the circular references problem, i.e. cannot
+ * load any attributes other than $ATTRIBUTE_LIST until $DATA is loaded, because
+ * we do not know where the other extent mft records are yet and again, because
+ * we cannot call map_mft_record*() yet. Obviously this applies only when an
+ * attribute list is actually present in $MFT inode.
+ *
+ * We solve these problems by starting with the $DATA attribute before anything
+ * else and iterating using ntfs_attr_lookup($DATA) over all extents. As each
+ * extent is found, we ntfs_mapping_pairs_decompress() including the implied
+ * ntfs_runlists_merge(). Each step of the iteration necessarily provides
+ * sufficient information for the next step to complete.
+ *
+ * This should work but there are two possible pit falls (see inline comments
+ * below), but only time will tell if they are real pits or just smoke...
+ */
+int ntfs_read_inode_mount(struct inode *vi)
+{
+ VCN next_vcn, last_vcn, highest_vcn;
+ s64 block;
+ struct super_block *sb = vi->i_sb;
+ ntfs_volume *vol = NTFS_SB(sb);
+ struct buffer_head *bh;
+ ntfs_inode *ni;
+ MFT_RECORD *m = NULL;
+ ATTR_RECORD *attr;
+ ntfs_attr_search_ctx *ctx;
+ unsigned int i, nr_blocks;
+ int err;
+
+ ntfs_debug("Entering.");
+
+ /* Initialize the ntfs specific part of @vi. */
+ ntfs_init_big_inode(vi);
+
+ ni = NTFS_I(vi);
+
+ /* Setup the data attribute. It is special as it is mst protected. */
+ NInoSetNonResident(ni);
+ NInoSetMstProtected(ni);
+ ni->type = AT_DATA;
+ ni->name = NULL;
+ ni->name_len = 0;
+
+ /*
+ * This sets up our little cheat allowing us to reuse the async read io
+ * completion handler for directories.
+ */
+ ni->itype.index.block_size = vol->mft_record_size;
+ ni->itype.index.block_size_bits = vol->mft_record_size_bits;
+
+ /* Very important! Needed to be able to call map_mft_record*(). */
+ vol->mft_ino = vi;
+
+ /* Allocate enough memory to read the first mft record. */
+ if (vol->mft_record_size > 64 * 1024) {
+ ntfs_error(sb, "Unsupported mft record size %i (max 64kiB).",
+ vol->mft_record_size);
+ goto err_out;
+ }
+ i = vol->mft_record_size;
+ if (i < sb->s_blocksize)
+ i = sb->s_blocksize;
+ m = (MFT_RECORD*)ntfs_malloc_nofs(i);
+ if (!m) {
+ ntfs_error(sb, "Failed to allocate buffer for $MFT record 0.");
+ goto err_out;
+ }
+
+ /* Determine the first block of the $MFT/$DATA attribute. */
+ block = vol->mft_lcn << vol->cluster_size_bits >>
+ sb->s_blocksize_bits;
+ nr_blocks = vol->mft_record_size >> sb->s_blocksize_bits;
+ if (!nr_blocks)
+ nr_blocks = 1;
+
+ /* Load $MFT/$DATA's first mft record. */
+ for (i = 0; i < nr_blocks; i++) {
+ bh = sb_bread(sb, block++);
+ if (!bh) {
+ ntfs_error(sb, "Device read failed.");
+ goto err_out;
+ }
+ memcpy((char*)m + (i << sb->s_blocksize_bits), bh->b_data,
+ sb->s_blocksize);
+ brelse(bh);
+ }
+
+ /* Apply the mst fixups. */
+ if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) {
+ /* FIXME: Try to use the $MFTMirr now. */
+ ntfs_error(sb, "MST fixup failed. $MFT is corrupt.");
+ goto err_out;
+ }
+
+ /* Need this to sanity check attribute list references to $MFT. */
+ vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number);
+
+ /* Provides readpage() and sync_page() for map_mft_record(). */
+ vi->i_mapping->a_ops = &ntfs_mst_aops;
+
+ ctx = ntfs_attr_get_search_ctx(ni, m);
+ if (!ctx) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ /* Find the attribute list attribute if present. */
+ err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx);
+ if (err) {
+ if (unlikely(err != -ENOENT)) {
+ ntfs_error(sb, "Failed to lookup attribute list "
+ "attribute. You should run chkdsk.");
+ goto put_err_out;
+ }
+ } else /* if (!err) */ {
+ ATTR_LIST_ENTRY *al_entry, *next_al_entry;
+ u8 *al_end;
+
+ ntfs_debug("Attribute list attribute found in $MFT.");
+ NInoSetAttrList(ni);
+ if (ctx->attr->flags & ATTR_IS_ENCRYPTED ||
+ ctx->attr->flags & ATTR_COMPRESSION_MASK ||
+ ctx->attr->flags & ATTR_IS_SPARSE) {
+ ntfs_error(sb, "Attribute list attribute is "
+ "compressed/encrypted/sparse. Not "
+ "allowed. $MFT is corrupt. You should "
+ "run chkdsk.");
+ goto put_err_out;
+ }
+ /* Now allocate memory for the attribute list. */
+ ni->attr_list_size = (u32)ntfs_attr_size(ctx->attr);
+ ni->attr_list = ntfs_malloc_nofs(ni->attr_list_size);
+ if (!ni->attr_list) {
+ ntfs_error(sb, "Not enough memory to allocate buffer "
+ "for attribute list.");
+ goto put_err_out;
+ }
+ if (ctx->attr->non_resident) {
+ NInoSetAttrListNonResident(ni);
+ if (ctx->attr->data.non_resident.lowest_vcn) {
+ ntfs_error(sb, "Attribute list has non zero "
+ "lowest_vcn. $MFT is corrupt. "
+ "You should run chkdsk.");
+ goto put_err_out;
+ }
+ /* Setup the runlist. */
+ ni->attr_list_rl.rl = ntfs_mapping_pairs_decompress(vol,
+ ctx->attr, NULL);
+ if (IS_ERR(ni->attr_list_rl.rl)) {
+ err = PTR_ERR(ni->attr_list_rl.rl);
+ ni->attr_list_rl.rl = NULL;
+ ntfs_error(sb, "Mapping pairs decompression "
+ "failed with error code %i.",
+ -err);
+ goto put_err_out;
+ }
+ /* Now load the attribute list. */
+ if ((err = load_attribute_list(vol, &ni->attr_list_rl,
+ ni->attr_list, ni->attr_list_size,
+ sle64_to_cpu(ctx->attr->data.
+ non_resident.initialized_size)))) {
+ ntfs_error(sb, "Failed to load attribute list "
+ "attribute with error code %i.",
+ -err);
+ goto put_err_out;
+ }
+ } else /* if (!ctx.attr->non_resident) */ {
+ if ((u8*)ctx->attr + le16_to_cpu(
+ ctx->attr->data.resident.value_offset) +
+ le32_to_cpu(
+ ctx->attr->data.resident.value_length) >
+ (u8*)ctx->mrec + vol->mft_record_size) {
+ ntfs_error(sb, "Corrupt attribute list "
+ "attribute.");
+ goto put_err_out;
+ }
+ /* Now copy the attribute list. */
+ memcpy(ni->attr_list, (u8*)ctx->attr + le16_to_cpu(
+ ctx->attr->data.resident.value_offset),
+ le32_to_cpu(
+ ctx->attr->data.resident.value_length));
+ }
+ /* The attribute list is now setup in memory. */
+ /*
+ * FIXME: I don't know if this case is actually possible.
+ * According to logic it is not possible but I have seen too
+ * many weird things in MS software to rely on logic... Thus we
+ * perform a manual search and make sure the first $MFT/$DATA
+ * extent is in the base inode. If it is not we abort with an
+ * error and if we ever see a report of this error we will need
+ * to do some magic in order to have the necessary mft record
+ * loaded and in the right place in the page cache. But
+ * hopefully logic will prevail and this never happens...
+ */
+ al_entry = (ATTR_LIST_ENTRY*)ni->attr_list;
+ al_end = (u8*)al_entry + ni->attr_list_size;
+ for (;; al_entry = next_al_entry) {
+ /* Out of bounds check. */
+ if ((u8*)al_entry < ni->attr_list ||
+ (u8*)al_entry > al_end)
+ goto em_put_err_out;
+ /* Catch the end of the attribute list. */
+ if ((u8*)al_entry == al_end)
+ goto em_put_err_out;
+ if (!al_entry->length)
+ goto em_put_err_out;
+ if ((u8*)al_entry + 6 > al_end || (u8*)al_entry +
+ le16_to_cpu(al_entry->length) > al_end)
+ goto em_put_err_out;
+ next_al_entry = (ATTR_LIST_ENTRY*)((u8*)al_entry +
+ le16_to_cpu(al_entry->length));
+ if (le32_to_cpu(al_entry->type) >
+ const_le32_to_cpu(AT_DATA))
+ goto em_put_err_out;
+ if (AT_DATA != al_entry->type)
+ continue;
+ /* We want an unnamed attribute. */
+ if (al_entry->name_length)
+ goto em_put_err_out;
+ /* Want the first entry, i.e. lowest_vcn == 0. */
+ if (al_entry->lowest_vcn)
+ goto em_put_err_out;
+ /* First entry has to be in the base mft record. */
+ if (MREF_LE(al_entry->mft_reference) != vi->i_ino) {
+ /* MFT references do not match, logic fails. */
+ ntfs_error(sb, "BUG: The first $DATA extent "
+ "of $MFT is not in the base "
+ "mft record. Please report "
+ "you saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ goto put_err_out;
+ } else {
+ /* Sequence numbers must match. */
+ if (MSEQNO_LE(al_entry->mft_reference) !=
+ ni->seq_no)
+ goto em_put_err_out;
+ /* Got it. All is ok. We can stop now. */
+ break;
+ }
+ }
+ }
+
+ ntfs_attr_reinit_search_ctx(ctx);
+
+ /* Now load all attribute extents. */
+ attr = NULL;
+ next_vcn = last_vcn = highest_vcn = 0;
+ while (!(err = ntfs_attr_lookup(AT_DATA, NULL, 0, 0, next_vcn, NULL, 0,
+ ctx))) {
+ runlist_element *nrl;
+
+ /* Cache the current attribute. */
+ attr = ctx->attr;
+ /* $MFT must be non-resident. */
+ if (!attr->non_resident) {
+ ntfs_error(sb, "$MFT must be non-resident but a "
+ "resident extent was found. $MFT is "
+ "corrupt. Run chkdsk.");
+ goto put_err_out;
+ }
+ /* $MFT must be uncompressed and unencrypted. */
+ if (attr->flags & ATTR_COMPRESSION_MASK ||
+ attr->flags & ATTR_IS_ENCRYPTED ||
+ attr->flags & ATTR_IS_SPARSE) {
+ ntfs_error(sb, "$MFT must be uncompressed, "
+ "non-sparse, and unencrypted but a "
+ "compressed/sparse/encrypted extent "
+ "was found. $MFT is corrupt. Run "
+ "chkdsk.");
+ goto put_err_out;
+ }
+ /*
+ * Decompress the mapping pairs array of this extent and merge
+ * the result into the existing runlist. No need for locking
+ * as we have exclusive access to the inode at this time and we
+ * are a mount in progress task, too.
+ */
+ nrl = ntfs_mapping_pairs_decompress(vol, attr, ni->runlist.rl);
+ if (IS_ERR(nrl)) {
+ ntfs_error(sb, "ntfs_mapping_pairs_decompress() "
+ "failed with error code %ld. $MFT is "
+ "corrupt.", PTR_ERR(nrl));
+ goto put_err_out;
+ }
+ ni->runlist.rl = nrl;
+
+ /* Are we in the first extent? */
+ if (!next_vcn) {
+ if (attr->data.non_resident.lowest_vcn) {
+ ntfs_error(sb, "First extent of $DATA "
+ "attribute has non zero "
+ "lowest_vcn. $MFT is corrupt. "
+ "You should run chkdsk.");
+ goto put_err_out;
+ }
+ /* Get the last vcn in the $DATA attribute. */
+ last_vcn = sle64_to_cpu(
+ attr->data.non_resident.allocated_size)
+ >> vol->cluster_size_bits;
+ /* Fill in the inode size. */
+ vi->i_size = sle64_to_cpu(
+ attr->data.non_resident.data_size);
+ ni->initialized_size = sle64_to_cpu(attr->data.
+ non_resident.initialized_size);
+ ni->allocated_size = sle64_to_cpu(
+ attr->data.non_resident.allocated_size);
+ /*
+ * Verify the number of mft records does not exceed
+ * 2^32 - 1.
+ */
+ if ((vi->i_size >> vol->mft_record_size_bits) >=
+ (1ULL << 32)) {
+ ntfs_error(sb, "$MFT is too big! Aborting.");
+ goto put_err_out;
+ }
+ /*
+ * We have got the first extent of the runlist for
+ * $MFT which means it is now relatively safe to call
+ * the normal ntfs_read_inode() function.
+ * Complete reading the inode, this will actually
+ * re-read the mft record for $MFT, this time entering
+ * it into the page cache with which we complete the
+ * kick start of the volume. It should be safe to do
+ * this now as the first extent of $MFT/$DATA is
+ * already known and we would hope that we don't need
+ * further extents in order to find the other
+ * attributes belonging to $MFT. Only time will tell if
+ * this is really the case. If not we will have to play
+ * magic at this point, possibly duplicating a lot of
+ * ntfs_read_inode() at this point. We will need to
+ * ensure we do enough of its work to be able to call
+ * ntfs_read_inode() on extents of $MFT/$DATA. But lets
+ * hope this never happens...
+ */
+ ntfs_read_locked_inode(vi);
+ if (is_bad_inode(vi)) {
+ ntfs_error(sb, "ntfs_read_inode() of $MFT "
+ "failed. BUG or corrupt $MFT. "
+ "Run chkdsk and if no errors "
+ "are found, please report you "
+ "saw this message to "
+ "linux-ntfs-dev@lists."
+ "sourceforge.net");
+ ntfs_attr_put_search_ctx(ctx);
+ /* Revert to the safe super operations. */
+ ntfs_free(m);
+ return -1;
+ }
+ /*
+ * Re-initialize some specifics about $MFT's inode as
+ * ntfs_read_inode() will have set up the default ones.
+ */
+ /* Set uid and gid to root. */
+ vi->i_uid = vi->i_gid = 0;
+ /* Regular file. No access for anyone. */
+ vi->i_mode = S_IFREG;
+ /* No VFS initiated operations allowed for $MFT. */
+ vi->i_op = &ntfs_empty_inode_ops;
+ vi->i_fop = &ntfs_empty_file_ops;
+ }
+
+ /* Get the lowest vcn for the next extent. */
+ highest_vcn = sle64_to_cpu(attr->data.non_resident.highest_vcn);
+ next_vcn = highest_vcn + 1;
+
+ /* Only one extent or error, which we catch below. */
+ if (next_vcn <= 0)
+ break;
+
+ /* Avoid endless loops due to corruption. */
+ if (next_vcn < sle64_to_cpu(
+ attr->data.non_resident.lowest_vcn)) {
+ ntfs_error(sb, "$MFT has corrupt attribute list "
+ "attribute. Run chkdsk.");
+ goto put_err_out;
+ }
+ }
+ if (err != -ENOENT) {
+ ntfs_error(sb, "Failed to lookup $MFT/$DATA attribute extent. "
+ "$MFT is corrupt. Run chkdsk.");
+ goto put_err_out;
+ }
+ if (!attr) {
+ ntfs_error(sb, "$MFT/$DATA attribute not found. $MFT is "
+ "corrupt. Run chkdsk.");
+ goto put_err_out;
+ }
+ if (highest_vcn && highest_vcn != last_vcn - 1) {
+ ntfs_error(sb, "Failed to load the complete runlist for "
+ "$MFT/$DATA. Driver bug or corrupt $MFT. "
+ "Run chkdsk.");
+ ntfs_debug("highest_vcn = 0x%llx, last_vcn - 1 = 0x%llx",
+ (unsigned long long)highest_vcn,
+ (unsigned long long)last_vcn - 1);
+ goto put_err_out;
+ }
+ ntfs_attr_put_search_ctx(ctx);
+ ntfs_debug("Done.");
+ ntfs_free(m);
+ return 0;
+
+em_put_err_out:
+ ntfs_error(sb, "Couldn't find first extent of $DATA attribute in "
+ "attribute list. $MFT is corrupt. Run chkdsk.");
+put_err_out:
+ ntfs_attr_put_search_ctx(ctx);
+err_out:
+ ntfs_error(sb, "Failed. Marking inode as bad.");
+ make_bad_inode(vi);
+ ntfs_free(m);
+ return -1;
+}
+
+/**
+ * ntfs_put_inode - handler for when the inode reference count is decremented
+ * @vi: vfs inode
+ *
+ * The VFS calls ntfs_put_inode() every time the inode reference count (i_count)
+ * is about to be decremented (but before the decrement itself.
+ *
+ * If the inode @vi is a directory with two references, one of which is being
+ * dropped, we need to put the attribute inode for the directory index bitmap,
+ * if it is present, otherwise the directory inode would remain pinned for
+ * ever.
+ */
+void ntfs_put_inode(struct inode *vi)
+{
+ if (S_ISDIR(vi->i_mode) && atomic_read(&vi->i_count) == 2) {
+ ntfs_inode *ni = NTFS_I(vi);
+ if (NInoIndexAllocPresent(ni)) {
+ struct inode *bvi = NULL;
+ down(&vi->i_sem);
+ if (atomic_read(&vi->i_count) == 2) {
+ bvi = ni->itype.index.bmp_ino;
+ if (bvi)
+ ni->itype.index.bmp_ino = NULL;
+ }
+ up(&vi->i_sem);
+ if (bvi)
+ iput(bvi);
+ }
+ }
+}
+
+static void __ntfs_clear_inode(ntfs_inode *ni)
+{
+ /* Free all alocated memory. */
+ down_write(&ni->runlist.lock);
+ if (ni->runlist.rl) {
+ ntfs_free(ni->runlist.rl);
+ ni->runlist.rl = NULL;
+ }
+ up_write(&ni->runlist.lock);
+
+ if (ni->attr_list) {
+ ntfs_free(ni->attr_list);
+ ni->attr_list = NULL;
+ }
+
+ down_write(&ni->attr_list_rl.lock);
+ if (ni->attr_list_rl.rl) {
+ ntfs_free(ni->attr_list_rl.rl);
+ ni->attr_list_rl.rl = NULL;
+ }
+ up_write(&ni->attr_list_rl.lock);
+
+ if (ni->name_len && ni->name != I30) {
+ /* Catch bugs... */
+ BUG_ON(!ni->name);
+ kfree(ni->name);
+ }
+}
+
+void ntfs_clear_extent_inode(ntfs_inode *ni)
+{
+ ntfs_debug("Entering for inode 0x%lx.", ni->mft_no);
+
+ BUG_ON(NInoAttr(ni));
+ BUG_ON(ni->nr_extents != -1);
+
+#ifdef NTFS_RW
+ if (NInoDirty(ni)) {
+ if (!is_bad_inode(VFS_I(ni->ext.base_ntfs_ino)))
+ ntfs_error(ni->vol->sb, "Clearing dirty extent inode! "
+ "Losing data! This is a BUG!!!");
+ // FIXME: Do something!!!
+ }
+#endif /* NTFS_RW */
+
+ __ntfs_clear_inode(ni);
+
+ /* Bye, bye... */
+ ntfs_destroy_extent_inode(ni);
+}
+
+/**
+ * ntfs_clear_big_inode - clean up the ntfs specific part of an inode
+ * @vi: vfs inode pending annihilation
+ *
+ * When the VFS is going to remove an inode from memory, ntfs_clear_big_inode()
+ * is called, which deallocates all memory belonging to the NTFS specific part
+ * of the inode and returns.
+ *
+ * If the MFT record is dirty, we commit it before doing anything else.
+ */
+void ntfs_clear_big_inode(struct inode *vi)
+{
+ ntfs_inode *ni = NTFS_I(vi);
+
+ /*
+ * If the inode @vi is an index inode we need to put the attribute
+ * inode for the index bitmap, if it is present, otherwise the index
+ * inode would disappear and the attribute inode for the index bitmap
+ * would no longer be referenced from anywhere and thus it would remain
+ * pinned for ever.
+ */
+ if (NInoAttr(ni) && (ni->type == AT_INDEX_ALLOCATION) &&
+ NInoIndexAllocPresent(ni) && ni->itype.index.bmp_ino) {
+ iput(ni->itype.index.bmp_ino);
+ ni->itype.index.bmp_ino = NULL;
+ }
+#ifdef NTFS_RW
+ if (NInoDirty(ni)) {
+ BOOL was_bad = (is_bad_inode(vi));
+
+ /* Committing the inode also commits all extent inodes. */
+ ntfs_commit_inode(vi);
+
+ if (!was_bad && (is_bad_inode(vi) || NInoDirty(ni))) {
+ ntfs_error(vi->i_sb, "Failed to commit dirty inode "
+ "0x%lx. Losing data!", vi->i_ino);
+ // FIXME: Do something!!!
+ }
+ }
+#endif /* NTFS_RW */
+
+ /* No need to lock at this stage as no one else has a reference. */
+ if (ni->nr_extents > 0) {
+ int i;
+
+ for (i = 0; i < ni->nr_extents; i++)
+ ntfs_clear_extent_inode(ni->ext.extent_ntfs_inos[i]);
+ kfree(ni->ext.extent_ntfs_inos);
+ }
+
+ __ntfs_clear_inode(ni);
+
+ if (NInoAttr(ni)) {
+ /* Release the base inode if we are holding it. */
+ if (ni->nr_extents == -1) {
+ iput(VFS_I(ni->ext.base_ntfs_ino));
+ ni->nr_extents = 0;
+ ni->ext.base_ntfs_ino = NULL;
+ }
+ }
+ return;
+}
+
+/**
+ * ntfs_show_options - show mount options in /proc/mounts
+ * @sf: seq_file in which to write our mount options
+ * @mnt: vfs mount whose mount options to display
+ *
+ * Called by the VFS once for each mounted ntfs volume when someone reads
+ * /proc/mounts in order to display the NTFS specific mount options of each
+ * mount. The mount options of the vfs mount @mnt are written to the seq file
+ * @sf and success is returned.
+ */
+int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt)
+{
+ ntfs_volume *vol = NTFS_SB(mnt->mnt_sb);
+ int i;
+
+ seq_printf(sf, ",uid=%i", vol->uid);
+ seq_printf(sf, ",gid=%i", vol->gid);
+ if (vol->fmask == vol->dmask)
+ seq_printf(sf, ",umask=0%o", vol->fmask);
+ else {
+ seq_printf(sf, ",fmask=0%o", vol->fmask);
+ seq_printf(sf, ",dmask=0%o", vol->dmask);
+ }
+ seq_printf(sf, ",nls=%s", vol->nls_map->charset);
+ if (NVolCaseSensitive(vol))
+ seq_printf(sf, ",case_sensitive");
+ if (NVolShowSystemFiles(vol))
+ seq_printf(sf, ",show_sys_files");
+ for (i = 0; on_errors_arr[i].val; i++) {
+ if (on_errors_arr[i].val & vol->on_errors)
+ seq_printf(sf, ",errors=%s", on_errors_arr[i].str);
+ }
+ seq_printf(sf, ",mft_zone_multiplier=%i", vol->mft_zone_multiplier);
+ return 0;
+}
+
+#ifdef NTFS_RW
+
+/**
+ * ntfs_truncate - called when the i_size of an ntfs inode is changed
+ * @vi: inode for which the i_size was changed
+ *
+ * We do not support i_size changes yet.
+ *
+ * The kernel guarantees that @vi is a regular file (S_ISREG() is true) and
+ * that the change is allowed.
+ *
+ * This implies for us that @vi is a file inode rather than a directory, index,
+ * or attribute inode as well as that @vi is a base inode.
+ *
+ * Returns 0 on success or -errno on error.
+ *
+ * Called with ->i_sem held. In all but one case ->i_alloc_sem is held for
+ * writing. The only case where ->i_alloc_sem is not held is
+ * mm/filemap.c::generic_file_buffered_write() where vmtruncate() is called
+ * with the current i_size as the offset which means that it is a noop as far
+ * as ntfs_truncate() is concerned.
+ */
+int ntfs_truncate(struct inode *vi)
+{
+ ntfs_inode *ni = NTFS_I(vi);
+ ntfs_volume *vol = ni->vol;
+ ntfs_attr_search_ctx *ctx;
+ MFT_RECORD *m;
+ const char *te = " Leaving file length out of sync with i_size.";
+ int err;
+
+ ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
+ BUG_ON(NInoAttr(ni));
+ BUG_ON(ni->nr_extents < 0);
+ m = map_mft_record(ni);
+ if (IS_ERR(m)) {
+ err = PTR_ERR(m);
+ ntfs_error(vi->i_sb, "Failed to map mft record for inode 0x%lx "
+ "(error code %d).%s", vi->i_ino, err, te);
+ ctx = NULL;
+ m = NULL;
+ goto err_out;
+ }
+ ctx = ntfs_attr_get_search_ctx(ni, m);
+ if (unlikely(!ctx)) {
+ ntfs_error(vi->i_sb, "Failed to allocate a search context for "
+ "inode 0x%lx (not enough memory).%s",
+ vi->i_ino, te);
+ err = -ENOMEM;
+ goto err_out;
+ }
+ err = ntfs_attr_lookup(ni->type, ni->name, ni->name_len,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ if (err == -ENOENT)
+ ntfs_error(vi->i_sb, "Open attribute is missing from "
+ "mft record. Inode 0x%lx is corrupt. "
+ "Run chkdsk.", vi->i_ino);
+ else
+ ntfs_error(vi->i_sb, "Failed to lookup attribute in "
+ "inode 0x%lx (error code %d).",
+ vi->i_ino, err);
+ goto err_out;
+ }
+ /* If the size has not changed there is nothing to do. */
+ if (ntfs_attr_size(ctx->attr) == i_size_read(vi))
+ goto done;
+ // TODO: Implement the truncate...
+ ntfs_error(vi->i_sb, "Inode size has changed but this is not "
+ "implemented yet. Resetting inode size to old value. "
+ " This is most likely a bug in the ntfs driver!");
+ i_size_write(vi, ntfs_attr_size(ctx->attr));
+done:
+ ntfs_attr_put_search_ctx(ctx);
+ unmap_mft_record(ni);
+ NInoClearTruncateFailed(ni);
+ ntfs_debug("Done.");
+ return 0;
+err_out:
+ if (err != -ENOMEM) {
+ NVolSetErrors(vol);
+ make_bad_inode(vi);
+ }
+ if (ctx)
+ ntfs_attr_put_search_ctx(ctx);
+ if (m)
+ unmap_mft_record(ni);
+ NInoSetTruncateFailed(ni);
+ return err;
+}
+
+/**
+ * ntfs_truncate_vfs - wrapper for ntfs_truncate() that has no return value
+ * @vi: inode for which the i_size was changed
+ *
+ * Wrapper for ntfs_truncate() that has no return value.
+ *
+ * See ntfs_truncate() description above for details.
+ */
+void ntfs_truncate_vfs(struct inode *vi) {
+ ntfs_truncate(vi);
+}
+
+/**
+ * ntfs_setattr - called from notify_change() when an attribute is being changed
+ * @dentry: dentry whose attributes to change
+ * @attr: structure describing the attributes and the changes
+ *
+ * We have to trap VFS attempts to truncate the file described by @dentry as
+ * soon as possible, because we do not implement changes in i_size yet. So we
+ * abort all i_size changes here.
+ *
+ * We also abort all changes of user, group, and mode as we do not implement
+ * the NTFS ACLs yet.
+ *
+ * Called with ->i_sem held. For the ATTR_SIZE (i.e. ->truncate) case, also
+ * called with ->i_alloc_sem held for writing.
+ *
+ * Basically this is a copy of generic notify_change() and inode_setattr()
+ * functionality, except we intercept and abort changes in i_size.
+ */
+int ntfs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *vi = dentry->d_inode;
+ int err;
+ unsigned int ia_valid = attr->ia_valid;
+
+ err = inode_change_ok(vi, attr);
+ if (err)
+ return err;
+
+ /* We do not support NTFS ACLs yet. */
+ if (ia_valid & (ATTR_UID | ATTR_GID | ATTR_MODE)) {
+ ntfs_warning(vi->i_sb, "Changes in user/group/mode are not "
+ "supported yet, ignoring.");
+ err = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (ia_valid & ATTR_SIZE) {
+ if (attr->ia_size != i_size_read(vi)) {
+ ntfs_warning(vi->i_sb, "Changes in inode size are not "
+ "supported yet, ignoring.");
+ err = -EOPNOTSUPP;
+ // TODO: Implement...
+ // err = vmtruncate(vi, attr->ia_size);
+ if (err || ia_valid == ATTR_SIZE)
+ goto out;
+ } else {
+ /*
+ * We skipped the truncate but must still update
+ * timestamps.
+ */
+ ia_valid |= ATTR_MTIME|ATTR_CTIME;
+ }
+ }
+
+ if (ia_valid & ATTR_ATIME)
+ vi->i_atime = attr->ia_atime;
+ if (ia_valid & ATTR_MTIME)
+ vi->i_mtime = attr->ia_mtime;
+ if (ia_valid & ATTR_CTIME)
+ vi->i_ctime = attr->ia_ctime;
+ mark_inode_dirty(vi);
+out:
+ return err;
+}
+
+/**
+ * ntfs_write_inode - write out a dirty inode
+ * @vi: inode to write out
+ * @sync: if true, write out synchronously
+ *
+ * Write out a dirty inode to disk including any extent inodes if present.
+ *
+ * If @sync is true, commit the inode to disk and wait for io completion. This
+ * is done using write_mft_record().
+ *
+ * If @sync is false, just schedule the write to happen but do not wait for i/o
+ * completion. In 2.6 kernels, scheduling usually happens just by virtue of
+ * marking the page (and in this case mft record) dirty but we do not implement
+ * this yet as write_mft_record() largely ignores the @sync parameter and
+ * always performs synchronous writes.
+ *
+ * Return 0 on success and -errno on error.
+ */
+int ntfs_write_inode(struct inode *vi, int sync)
+{
+ sle64 nt;
+ ntfs_inode *ni = NTFS_I(vi);
+ ntfs_attr_search_ctx *ctx;
+ MFT_RECORD *m;
+ STANDARD_INFORMATION *si;
+ int err = 0;
+ BOOL modified = FALSE;
+
+ ntfs_debug("Entering for %sinode 0x%lx.", NInoAttr(ni) ? "attr " : "",
+ vi->i_ino);
+ /*
+ * Dirty attribute inodes are written via their real inodes so just
+ * clean them here. Access time updates are taken care off when the
+ * real inode is written.
+ */
+ if (NInoAttr(ni)) {
+ NInoClearDirty(ni);
+ ntfs_debug("Done.");
+ return 0;
+ }
+ /* Map, pin, and lock the mft record belonging to the inode. */
+ m = map_mft_record(ni);
+ if (IS_ERR(m)) {
+ err = PTR_ERR(m);
+ goto err_out;
+ }
+ /* Update the access times in the standard information attribute. */
+ ctx = ntfs_attr_get_search_ctx(ni, m);
+ if (unlikely(!ctx)) {
+ err = -ENOMEM;
+ goto unm_err_out;
+ }
+ err = ntfs_attr_lookup(AT_STANDARD_INFORMATION, NULL, 0,
+ CASE_SENSITIVE, 0, NULL, 0, ctx);
+ if (unlikely(err)) {
+ ntfs_attr_put_search_ctx(ctx);
+ goto unm_err_out;
+ }
+ si = (STANDARD_INFORMATION*)((u8*)ctx->attr +
+ le16_to_cpu(ctx->attr->data.resident.value_offset));
+ /* Update the access times if they have changed. */
+ nt = utc2ntfs(vi->i_mtime);
+ if (si->last_data_change_time != nt) {
+ ntfs_debug("Updating mtime for inode 0x%lx: old = 0x%llx, "
+ "new = 0x%llx", vi->i_ino,
+ sle64_to_cpu(si->last_data_change_time),
+ sle64_to_cpu(nt));
+ si->last_data_change_time = nt;
+ modified = TRUE;
+ }
+ nt = utc2ntfs(vi->i_ctime);
+ if (si->last_mft_change_time != nt) {
+ ntfs_debug("Updating ctime for inode 0x%lx: old = 0x%llx, "
+ "new = 0x%llx", vi->i_ino,
+ sle64_to_cpu(si->last_mft_change_time),
+ sle64_to_cpu(nt));
+ si->last_mft_change_time = nt;
+ modified = TRUE;
+ }
+ nt = utc2ntfs(vi->i_atime);
+ if (si->last_access_time != nt) {
+ ntfs_debug("Updating atime for inode 0x%lx: old = 0x%llx, "
+ "new = 0x%llx", vi->i_ino,
+ sle64_to_cpu(si->last_access_time),
+ sle64_to_cpu(nt));
+ si->last_access_time = nt;
+ modified = TRUE;
+ }
+ /*
+ * If we just modified the standard information attribute we need to
+ * mark the mft record it is in dirty. We do this manually so that
+ * mark_inode_dirty() is not called which would redirty the inode and
+ * hence result in an infinite loop of trying to write the inode.
+ * There is no need to mark the base inode nor the base mft record
+ * dirty, since we are going to write this mft record below in any case
+ * and the base mft record may actually not have been modified so it
+ * might not need to be written out.
+ * NOTE: It is not a problem when the inode for $MFT itself is being
+ * written out as mark_ntfs_record_dirty() will only set I_DIRTY_PAGES
+ * on the $MFT inode and hence ntfs_write_inode() will not be
+ * re-invoked because of it which in turn is ok since the dirtied mft
+ * record will be cleaned and written out to disk below, i.e. before
+ * this function returns.
+ */
+ if (modified && !NInoTestSetDirty(ctx->ntfs_ino))
+ mark_ntfs_record_dirty(ctx->ntfs_ino->page,
+ ctx->ntfs_ino->page_ofs);
+ ntfs_attr_put_search_ctx(ctx);
+ /* Now the access times are updated, write the base mft record. */
+ if (NInoDirty(ni))
+ err = write_mft_record(ni, m, sync);
+ /* Write all attached extent mft records. */
+ down(&ni->extent_lock);
+ if (ni->nr_extents > 0) {
+ ntfs_inode **extent_nis = ni->ext.extent_ntfs_inos;
+ int i;
+
+ ntfs_debug("Writing %i extent inodes.", ni->nr_extents);
+ for (i = 0; i < ni->nr_extents; i++) {
+ ntfs_inode *tni = extent_nis[i];
+
+ if (NInoDirty(tni)) {
+ MFT_RECORD *tm = map_mft_record(tni);
+ int ret;
+
+ if (IS_ERR(tm)) {
+ if (!err || err == -ENOMEM)
+ err = PTR_ERR(tm);
+ continue;
+ }
+ ret = write_mft_record(tni, tm, sync);
+ unmap_mft_record(tni);
+ if (unlikely(ret)) {
+ if (!err || err == -ENOMEM)
+ err = ret;
+ }
+ }
+ }
+ }
+ up(&ni->extent_lock);
+ unmap_mft_record(ni);
+ if (unlikely(err))
+ goto err_out;
+ ntfs_debug("Done.");
+ return 0;
+unm_err_out:
+ unmap_mft_record(ni);
+err_out:
+ if (err == -ENOMEM) {
+ ntfs_warning(vi->i_sb, "Not enough memory to write inode. "
+ "Marking the inode dirty again, so the VFS "
+ "retries later.");
+ mark_inode_dirty(vi);
+ } else {
+ ntfs_error(vi->i_sb, "Failed (error code %i): Marking inode "
+ "as bad. You should run chkdsk.", -err);
+ make_bad_inode(vi);
+ NVolSetErrors(ni->vol);
+ }
+ return err;
+}
+
+#endif /* NTFS_RW */