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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /**
  * inode.c - NTFS kernel inode handling.
  *
  * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
  */
 
 #include <linux/buffer_head.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/mount.h>
 #include <linux/mutex.h>
 #include <linux/pagemap.h>
 #include <linux/quotaops.h>
 #include <linux/slab.h>
 #include <linux/log2.h>
 
 #include "aops.h"
 #include "attrib.h"
 #include "bitmap.h"
 #include "dir.h"
 #include "debug.h"
 #include "inode.h"
 #include "lcnalloc.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
  * @data:   data 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 @data.
  *
  * 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_hash_lock spin lock held so it is not
  * allowed to sleep.
  */
 int ntfs_test_inode(struct inode *vi, void *data)
 {
     ntfs_attr *na = (ntfs_attr *)data;
     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
  * @data:   data which to initialize @vi to
  *
  * Initialize the vfs inode @vi with the values from the ntfs attribute @data 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_locked_inode() will fill them in later.
  *
  * Return 0 on success and -errno on error.
  *
  * NOTE: This function runs with the inode->i_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, void *data)
 {
     ntfs_attr *na = (ntfs_attr *)data;
     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 = kmalloc(i + sizeof(ntfschar), GFP_ATOMIC);
         if (!ni->name)
             return -ENOMEM;
         memcpy(ni->name, na->name, i);
         ni->name[na->name_len] = 0;
     }
     return 0;
 }
 
 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;
     int err;
     ntfs_attr na;
 
     na.mft_no = mft_no;
     na.type = AT_UNUSED;
     na.name = NULL;
     na.name_len = 0;
 
     vi = iget5_locked(sb, mft_no, ntfs_test_inode,
             ntfs_init_locked_inode, &na);
     if (unlikely(!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 (unlikely(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;
     int err;
     ntfs_attr na;
 
     /* 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, ntfs_test_inode,
             ntfs_init_locked_inode, &na);
     if (unlikely(!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 (unlikely(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;
     int err;
     ntfs_attr na;
 
     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, ntfs_test_inode,
             ntfs_init_locked_inode, &na);
     if (unlikely(!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 (unlikely(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 = alloc_inode_sb(sb, ntfs_big_inode_cache, GFP_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_free_big_inode(struct inode *inode)
 {
     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 = kmem_cache_alloc(ntfs_inode_cache, GFP_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);
 }
 
 /*
  * The attribute runlist lock has separate locking rules from the
  * normal runlist lock, so split the two lock-classes:
  */
 static struct lock_class_key attr_list_rl_lock_class;
 
 /**
  * __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.");
     rwlock_init(&ni->size_lock);
     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);
     mutex_init(&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);
     lockdep_set_class(&ni->attr_list_rl.lock,
                 &attr_list_rl_lock_class);
     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;
     mutex_init(&ni->extent_lock);
     ni->nr_extents = 0;
     ni->ext.base_ntfs_ino = NULL;
 }
 
 /*
  * Extent inodes get MFT-mapped in a nested way, while the base inode
  * is still mapped. Teach this nesting to the lock validator by creating
  * a separate class for nested inode's mrec_lock's:
  */
 static struct lock_class_key extent_inode_mrec_lock_key;
 
 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);
         lockdep_set_class(&ni->mrec_lock, &extent_inode_mrec_lock_key);
         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 *)file_name_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_NEW 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;
     struct inode *bvi;
     MFT_RECORD *m;
     ATTR_RECORD *a;
     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. */
     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.
      */
     set_nlink(vi, 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, no one 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)
             set_nlink(vi, 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;
     }
     a = ctx->attr;
     /* Get the standard information attribute value. */
     if ((u8 *)a + le16_to_cpu(a->data.resident.value_offset)
             + le32_to_cpu(a->data.resident.value_length) >
             (u8 *)ctx->mrec + vol->mft_record_size) {
         ntfs_error(vi->i_sb, "Corrupt standard information attribute in inode.");
         goto unm_err_out;
     }
     si = (STANDARD_INFORMATION*)((u8*)a +
             le16_to_cpu(a->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);
         a = ctx->attr;
         if (a->flags & ATTR_COMPRESSION_MASK) {
             ntfs_error(vi->i_sb, "Attribute list attribute is "
                     "compressed.");
             goto unm_err_out;
         }
         if (a->flags & ATTR_IS_ENCRYPTED ||
                 a->flags & ATTR_IS_SPARSE) {
             if (a->non_resident) {
                 ntfs_error(vi->i_sb, "Non-resident attribute "
                         "list attribute is encrypted/"
                         "sparse.");
                 goto unm_err_out;
             }
             ntfs_warning(vi->i_sb, "Resident attribute list "
                     "attribute in inode 0x%lx is marked "
                     "encrypted/sparse which is not true.  "
                     "However, Windows allows this and "
                     "chkdsk does not detect or correct it "
                     "so we will just ignore the invalid "
                     "flags and pretend they are not set.",
                     vi->i_ino);
         }
         /* Now allocate memory for the attribute list. */
         ni->attr_list_size = (u32)ntfs_attr_size(a);
         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 (a->non_resident) {
             NInoSetAttrListNonResident(ni);
             if (a->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,
                     a, 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(a->data.non_resident.
                     initialized_size)))) {
                 ntfs_error(vi->i_sb, "Failed to load "
                         "attribute list attribute.");
                 goto unm_err_out;
             }
         } else /* if (!a->non_resident) */ {
             if ((u8*)a + le16_to_cpu(a->data.resident.value_offset)
                     + le32_to_cpu(
                     a->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*)a + le16_to_cpu(
                     a->data.resident.value_offset),
                     le32_to_cpu(
                     a->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)) {
         loff_t bvi_size;
         ntfs_inode *bni;
         INDEX_ROOT *ir;
         u8 *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, "$INDEX_ROOT attribute "
                         "is missing.");
             }
             goto unm_err_out;
         }
         a = ctx->attr;
         /* Set up the state. */
         if (unlikely(a->non_resident)) {
             ntfs_error(vol->sb, "$INDEX_ROOT attribute is not "
                     "resident.");
             goto unm_err_out;
         }
         /* Ensure the attribute name is placed before the value. */
         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
                 le16_to_cpu(a->data.resident.value_offset)))) {
             ntfs_error(vol->sb, "$INDEX_ROOT attribute name is "
                     "placed after the attribute value.");
             goto unm_err_out;
         }
         /*
          * Compressed/encrypted index root just means that the newly
          * created files in that directory should be created compressed/
          * encrypted. However index root cannot be both compressed and
          * encrypted.
          */
         if (a->flags & ATTR_COMPRESSION_MASK)
             NInoSetCompressed(ni);
         if (a->flags & ATTR_IS_ENCRYPTED) {
             if (a->flags & ATTR_COMPRESSION_MASK) {
                 ntfs_error(vi->i_sb, "Found encrypted and "
                         "compressed attribute.");
                 goto unm_err_out;
             }
             NInoSetEncrypted(ni);
         }
         if (a->flags & ATTR_IS_SPARSE)
             NInoSetSparse(ni);
         ir = (INDEX_ROOT*)((u8*)a +
                 le16_to_cpu(a->data.resident.value_offset));
         ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
         if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
             ntfs_error(vi->i_sb, "$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, "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_SIZE) {
             ntfs_error(vi->i_sb, "Index block size (%u) > "
                     "PAGE_SIZE (%ld) is not "
                     "supported.  Sorry.",
                     ni->itype.index.block_size,
                     PAGE_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 "
                         "$INDEX_ALLOCATION "
                         "attribute.");
             goto unm_err_out;
         }
         a = ctx->attr;
         if (!a->non_resident) {
             ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
                     "is resident.");
             goto unm_err_out;
         }
         /*
          * Ensure the attribute name is placed before the mapping pairs
          * array.
          */
         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
                 le16_to_cpu(
                 a->data.non_resident.mapping_pairs_offset)))) {
             ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name "
                     "is placed after the mapping pairs "
                     "array.");
             goto unm_err_out;
         }
         if (a->flags & ATTR_IS_ENCRYPTED) {
             ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
                     "is encrypted.");
             goto unm_err_out;
         }
         if (a->flags & ATTR_IS_SPARSE) {
             ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
                     "is sparse.");
             goto unm_err_out;
         }
         if (a->flags & ATTR_COMPRESSION_MASK) {
             ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute "
                     "is compressed.");
             goto unm_err_out;
         }
         if (a->data.non_resident.lowest_vcn) {
             ntfs_error(vi->i_sb, "First extent of "
                     "$INDEX_ALLOCATION attribute has non "
                     "zero lowest_vcn.");
             goto unm_err_out;
         }
         vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
         ni->initialized_size = sle64_to_cpu(
                 a->data.non_resident.initialized_size);
         ni->allocated_size = sle64_to_cpu(
                 a->data.non_resident.allocated_size);
         /*
          * We are done with the mft record, so we release it. Otherwise
          * we would deadlock in ntfs_attr_iget().
          */
         ntfs_attr_put_search_ctx(ctx);
         unmap_mft_record(ni);
         m = NULL;
         ctx = NULL;
         /* Get the index bitmap attribute inode. */
         bvi = ntfs_attr_iget(vi, AT_BITMAP, I30, 4);
         if (IS_ERR(bvi)) {
             ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
             err = PTR_ERR(bvi);
             goto unm_err_out;
         }
         bni = NTFS_I(bvi);
         if (NInoCompressed(bni) || NInoEncrypted(bni) ||
                 NInoSparse(bni)) {
             ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
                     "and/or encrypted and/or sparse.");
             goto iput_unm_err_out;
         }
         /* Consistency check bitmap size vs. index allocation size. */
         bvi_size = i_size_read(bvi);
         if ((bvi_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_size << 3, vi->i_size);
             goto iput_unm_err_out;
         }
         /* No longer need the bitmap attribute inode. */
         iput(bvi);
 skip_large_dir_stuff:
         /* Setup the operations for this inode. */
         vi->i_op = &ntfs_dir_inode_ops;
         vi->i_fop = &ntfs_dir_ops;
         vi->i_mapping->a_ops = &ntfs_mst_aops;
     } 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;
         }
         a = ctx->attr;
         /* Setup the state. */
         if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
             if (a->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 ((a->flags & ATTR_COMPRESSION_MASK)
                         != ATTR_IS_COMPRESSED) {
                     ntfs_error(vi->i_sb, "Found unknown "
                             "compression method "
                             "or corrupt file.");
                     goto unm_err_out;
                 }
             }
             if (a->flags & ATTR_IS_SPARSE)
                 NInoSetSparse(ni);
         }
         if (a->flags & ATTR_IS_ENCRYPTED) {
             if (NInoCompressed(ni)) {
                 ntfs_error(vi->i_sb, "Found encrypted and "
                         "compressed data.");
                 goto unm_err_out;
             }
             NInoSetEncrypted(ni);
         }
         if (a->non_resident) {
             NInoSetNonResident(ni);
             if (NInoCompressed(ni) || NInoSparse(ni)) {
                 if (NInoCompressed(ni) && a->data.non_resident.
                         compression_unit != 4) {
                     ntfs_error(vi->i_sb, "Found "
                             "non-standard "
                             "compression unit (%u "
                             "instead of 4).  "
                             "Cannot handle this.",
                             a->data.non_resident.
                             compression_unit);
                     err = -EOPNOTSUPP;
                     goto unm_err_out;
                 }
                 if (a->data.non_resident.compression_unit) {
                     ni->itype.compressed.block_size = 1U <<
                             (a->data.non_resident.
                             compression_unit +
                             vol->cluster_size_bits);
                     ni->itype.compressed.block_size_bits =
                             ffs(ni->itype.
                             compressed.
                             block_size) - 1;
                     ni->itype.compressed.block_clusters =
                             1U << a->data.
                             non_resident.
                             compression_unit;
                 } else {
                     ni->itype.compressed.block_size = 0;
                     ni->itype.compressed.block_size_bits =
                             0;
                     ni->itype.compressed.block_clusters =
                             0;
                 }
                 ni->itype.compressed.size = sle64_to_cpu(
                         a->data.non_resident.
                         compressed_size);
             }
             if (a->data.non_resident.lowest_vcn) {
                 ntfs_error(vi->i_sb, "First extent of $DATA "
                         "attribute has non zero "
                         "lowest_vcn.");
                 goto unm_err_out;
             }
             vi->i_size = sle64_to_cpu(
                     a->data.non_resident.data_size);
             ni->initialized_size = sle64_to_cpu(
                     a->data.non_resident.initialized_size);
             ni->allocated_size = sle64_to_cpu(
                     a->data.non_resident.allocated_size);
         } else { /* Resident attribute. */
             vi->i_size = ni->initialized_size = le32_to_cpu(
                     a->data.resident.value_length);
             ni->allocated_size = le32_to_cpu(a->length) -
                     le16_to_cpu(
                     a->data.resident.value_offset);
             if (vi->i_size > ni->allocated_size) {
                 ntfs_error(vi->i_sb, "Resident data attribute "
                         "is corrupt (size exceeds "
                         "allocation).");
                 goto unm_err_out;
             }
         }
 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;
         vi->i_mapping->a_ops = &ntfs_normal_aops;
         if (NInoMstProtected(ni))
             vi->i_mapping->a_ops = &ntfs_mst_aops;
         else if (NInoCompressed(ni))
             vi->i_mapping->a_ops = &ntfs_compressed_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_ISREG(vi->i_mode) && (NInoCompressed(ni) || NInoSparse(ni)))
         vi->i_blocks = ni->itype.compressed.size >> 9;
     else
         vi->i_blocks = ni->allocated_size >> 9;
     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(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_NEW 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.
  *
  * Note this cannot be called for AT_INDEX_ALLOCATION.
  */
 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;
     ATTR_RECORD *a;
     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_uid   = base_vi->i_uid;
     vi->i_gid   = base_vi->i_gid;
     set_nlink(vi, 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;
     a = ctx->attr;
     if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_SPARSE)) {
         if (a->flags & ATTR_COMPRESSION_MASK) {
             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 ((a->flags & ATTR_COMPRESSION_MASK) !=
                     ATTR_IS_COMPRESSED) {
                 ntfs_error(vi->i_sb, "Found unknown "
                         "compression method.");
                 goto unm_err_out;
             }
         }
         /*
          * The compressed/sparse flag set in an index root just means
          * to compress all files.
          */
         if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
             ntfs_error(vi->i_sb, "Found mst protected attribute "
                     "but the attribute is %s.  Please "
                     "report you saw this message to "
                     "linux-ntfs-dev@lists.sourceforge.net",
                     NInoCompressed(ni) ? "compressed" :
                     "sparse");
             goto unm_err_out;
         }
         if (a->flags & ATTR_IS_SPARSE)
             NInoSetSparse(ni);
     }
     if (a->flags & ATTR_IS_ENCRYPTED) {
         if (NInoCompressed(ni)) {
             ntfs_error(vi->i_sb, "Found encrypted and compressed "
                     "data.");
             goto unm_err_out;
         }
         /*
          * The encryption flag set in an index root just means to
          * encrypt all files.
          */
         if (NInoMstProtected(ni) && ni->type != AT_INDEX_ROOT) {
             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;
         }
         if (ni->type != AT_DATA) {
             ntfs_error(vi->i_sb, "Found encrypted non-data "
                     "attribute.");
             goto unm_err_out;
         }
         NInoSetEncrypted(ni);
     }
     if (!a->non_resident) {
         /* Ensure the attribute name is placed before the value. */
         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
                 le16_to_cpu(a->data.resident.value_offset)))) {
             ntfs_error(vol->sb, "Attribute name is placed after "
                     "the attribute value.");
             goto unm_err_out;
         }
         if (NInoMstProtected(ni)) {
             ntfs_error(vi->i_sb, "Found mst protected attribute "
                     "but the attribute is resident.  "
                     "Please report you saw this message to "
                     "linux-ntfs-dev@lists.sourceforge.net");
             goto unm_err_out;
         }
         vi->i_size = ni->initialized_size = le32_to_cpu(
                 a->data.resident.value_length);
         ni->allocated_size = le32_to_cpu(a->length) -
                 le16_to_cpu(a->data.resident.value_offset);
         if (vi->i_size > ni->allocated_size) {
             ntfs_error(vi->i_sb, "Resident attribute is corrupt "
                     "(size exceeds allocation).");
             goto unm_err_out;
         }
     } else {
         NInoSetNonResident(ni);
         /*
          * Ensure the attribute name is placed before the mapping pairs
          * array.
          */
         if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
                 le16_to_cpu(
                 a->data.non_resident.mapping_pairs_offset)))) {
             ntfs_error(vol->sb, "Attribute name is placed after "
                     "the mapping pairs array.");
             goto unm_err_out;
         }
         if (NInoCompressed(ni) || NInoSparse(ni)) {
             if (NInoCompressed(ni) && a->data.non_resident.
                     compression_unit != 4) {
                 ntfs_error(vi->i_sb, "Found non-standard "
                         "compression unit (%u instead "
                         "of 4).  Cannot handle this.",
                         a->data.non_resident.
                         compression_unit);
                 err = -EOPNOTSUPP;
                 goto unm_err_out;
             }
             if (a->data.non_resident.compression_unit) {
                 ni->itype.compressed.block_size = 1U <<
                         (a->data.non_resident.
                         compression_unit +
                         vol->cluster_size_bits);
                 ni->itype.compressed.block_size_bits =
                         ffs(ni->itype.compressed.
                         block_size) - 1;
                 ni->itype.compressed.block_clusters = 1U <<
                         a->data.non_resident.
                         compression_unit;
             } else {
                 ni->itype.compressed.block_size = 0;
                 ni->itype.compressed.block_size_bits = 0;
                 ni->itype.compressed.block_clusters = 0;
             }
             ni->itype.compressed.size = sle64_to_cpu(
                     a->data.non_resident.compressed_size);
         }
         if (a->data.non_resident.lowest_vcn) {
             ntfs_error(vi->i_sb, "First extent of attribute has "
                     "non-zero lowest_vcn.");
             goto unm_err_out;
         }
         vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
         ni->initialized_size = sle64_to_cpu(
                 a->data.non_resident.initialized_size);
         ni->allocated_size = sle64_to_cpu(
                 a->data.non_resident.allocated_size);
     }
     vi->i_mapping->a_ops = &ntfs_normal_aops;
     if (NInoMstProtected(ni))
         vi->i_mapping->a_ops = &ntfs_mst_aops;
     else if (NInoCompressed(ni))
         vi->i_mapping->a_ops = &ntfs_compressed_aops;
     if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT)
         vi->i_blocks = ni->itype.compressed.size >> 9;
     else
         vi->i_blocks = ni->allocated_size >> 9;
     /*
      * Make sure the base inode does not 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);
     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_NEW 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)
 {
     loff_t bvi_size;
     ntfs_volume *vol = NTFS_SB(vi->i_sb);
     ntfs_inode *ni, *base_ni, *bni;
     struct inode *bvi;
     MFT_RECORD *m;
     ATTR_RECORD *a;
     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_uid   = base_vi->i_uid;
     vi->i_gid   = base_vi->i_gid;
     set_nlink(vi, 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, "$INDEX_ROOT attribute is "
                     "missing.");
         goto unm_err_out;
     }
     a = ctx->attr;
     /* Set up the state. */
     if (unlikely(a->non_resident)) {
         ntfs_error(vol->sb, "$INDEX_ROOT attribute is not resident.");
         goto unm_err_out;
     }
     /* Ensure the attribute name is placed before the value. */
     if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
             le16_to_cpu(a->data.resident.value_offset)))) {
         ntfs_error(vol->sb, "$INDEX_ROOT attribute name is placed "
                 "after the attribute value.");
         goto unm_err_out;
     }
     /*
      * Compressed/encrypted/sparse index root is not allowed, except for
      * directories of course but those are not dealt with here.
      */
     if (a->flags & (ATTR_COMPRESSION_MASK | ATTR_IS_ENCRYPTED |
             ATTR_IS_SPARSE)) {
         ntfs_error(vi->i_sb, "Found compressed/encrypted/sparse index "
                 "root attribute.");
         goto unm_err_out;
     }
     ir = (INDEX_ROOT*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));
     ir_end = (u8*)ir + le32_to_cpu(a->data.resident.value_length);
     if (ir_end > (u8*)ctx->mrec + vol->mft_record_size) {
         ntfs_error(vi->i_sb, "$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 (!is_power_of_2(ni->itype.index.block_size)) {
         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_SIZE) {
         ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_SIZE "
                 "(%ld) is not supported.  Sorry.",
                 ni->itype.index.block_size, PAGE_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;
     }
     a = ctx->attr;
     if (!a->non_resident) {
         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
                 "resident.");
         goto unm_err_out;
     }
     /*
      * Ensure the attribute name is placed before the mapping pairs array.
      */
     if (unlikely(a->name_length && (le16_to_cpu(a->name_offset) >=
             le16_to_cpu(
             a->data.non_resident.mapping_pairs_offset)))) {
         ntfs_error(vol->sb, "$INDEX_ALLOCATION attribute name is "
                 "placed after the mapping pairs array.");
         goto unm_err_out;
     }
     if (a->flags & ATTR_IS_ENCRYPTED) {
         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
                 "encrypted.");
         goto unm_err_out;
     }
     if (a->flags & ATTR_IS_SPARSE) {
         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is sparse.");
         goto unm_err_out;
     }
     if (a->flags & ATTR_COMPRESSION_MASK) {
         ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is "
                 "compressed.");
         goto unm_err_out;
     }
     if (a->data.non_resident.lowest_vcn) {
         ntfs_error(vi->i_sb, "First extent of $INDEX_ALLOCATION "
                 "attribute has non zero lowest_vcn.");
         goto unm_err_out;
     }
     vi->i_size = sle64_to_cpu(a->data.non_resident.data_size);
     ni->initialized_size = sle64_to_cpu(
             a->data.non_resident.initialized_size);
     ni->allocated_size = sle64_to_cpu(a->data.non_resident.allocated_size);
     /*
      * We are done with the mft record, so we release it.  Otherwise
      * we would deadlock in ntfs_attr_iget().
      */
     ntfs_attr_put_search_ctx(ctx);
     unmap_mft_record(base_ni);
     m = NULL;
     ctx = NULL;
     /* Get the index bitmap attribute inode. */
     bvi = ntfs_attr_iget(base_vi, AT_BITMAP, ni->name, ni->name_len);
     if (IS_ERR(bvi)) {
         ntfs_error(vi->i_sb, "Failed to get bitmap attribute.");
         err = PTR_ERR(bvi);
         goto unm_err_out;
     }
     bni = NTFS_I(bvi);
     if (NInoCompressed(bni) || NInoEncrypted(bni) ||
             NInoSparse(bni)) {
         ntfs_error(vi->i_sb, "$BITMAP attribute is compressed and/or "
                 "encrypted and/or sparse.");
         goto iput_unm_err_out;
     }
     /* Consistency check bitmap size vs. index allocation size. */
     bvi_size = i_size_read(bvi);
     if ((bvi_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_size << 3,
                 vi->i_size);
         goto iput_unm_err_out;
     }
     iput(bvi);
 skip_large_index_stuff:
     /* Setup the operations for this index inode. */
     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;
 }
 
 /*
  * The MFT inode has special locking, so teach the lock validator
  * about this by splitting off the locking rules of the MFT from
  * the locking rules of other inodes. The MFT inode can never be
  * accessed from the VFS side (or even internally), only by the
  * map_mft functions.
  */
 static struct lock_class_key mft_ni_runlist_lock_key, mft_ni_mrec_lock_key;
 
 /**
  * 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 *a;
     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);
     NInoSetSparseDisabled(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);
     }
 
     if (le32_to_cpu(m->bytes_allocated) != vol->mft_record_size) {
         ntfs_error(sb, "Incorrect mft record size %u in superblock, should be %u.",
                 le32_to_cpu(m->bytes_allocated), vol->mft_record_size);
         goto err_out;
     }
 
     /* 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 read_folio() 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;
         static const char *es = "  Not allowed.  $MFT is corrupt.  "
                 "You should run chkdsk.";
 
         ntfs_debug("Attribute list attribute found in $MFT.");
         NInoSetAttrList(ni);
         a = ctx->attr;
         if (a->flags & ATTR_COMPRESSION_MASK) {
             ntfs_error(sb, "Attribute list attribute is "
                     "compressed.%s", es);
             goto put_err_out;
         }
         if (a->flags & ATTR_IS_ENCRYPTED ||
                 a->flags & ATTR_IS_SPARSE) {
             if (a->non_resident) {
                 ntfs_error(sb, "Non-resident attribute list "
                         "attribute is encrypted/"
                         "sparse.%s", es);
                 goto put_err_out;
             }
             ntfs_warning(sb, "Resident attribute list attribute "
                     "in $MFT system file is marked "
                     "encrypted/sparse which is not true.  "
                     "However, Windows allows this and "
                     "chkdsk does not detect or correct it "
                     "so we will just ignore the invalid "
                     "flags and pretend they are not set.");
         }
         /* Now allocate memory for the attribute list. */
         ni->attr_list_size = (u32)ntfs_attr_size(a);
         if (!ni->attr_list_size) {
             ntfs_error(sb, "Attr_list_size is zero");
             goto put_err_out;
         }
         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 (a->non_resident) {
             NInoSetAttrListNonResident(ni);
             if (a->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,
                     a, 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(a->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*)a + le16_to_cpu(
                     a->data.resident.value_offset) +
                     le32_to_cpu(
                     a->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*)a + le16_to_cpu(
                     a->data.resident.value_offset),
                     le32_to_cpu(
                     a->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) > 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. */
     a = 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. */
         a = ctx->attr;
         /* $MFT must be non-resident. */
         if (!a->non_resident) {
             ntfs_error(sb, "$MFT must be non-resident but a "
                     "resident extent was found. $MFT is "
                     "corrupt. Run chkdsk.");
             goto put_err_out;
         }
         /* $MFT must be uncompressed and unencrypted. */
         if (a->flags & ATTR_COMPRESSION_MASK ||
                 a->flags & ATTR_IS_ENCRYPTED ||
                 a->flags & ATTR_IS_SPARSE) {
             ntfs_error(sb, "$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, a, 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 (a->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 $DATA attribute. */
             last_vcn = sle64_to_cpu(
                     a->data.non_resident.allocated_size)
                     >> vol->cluster_size_bits;
             /* Fill in the inode size. */
             vi->i_size = sle64_to_cpu(
                     a->data.non_resident.data_size);
             ni->initialized_size = sle64_to_cpu(
                     a->data.non_resident.initialized_size);
             ni->allocated_size = sle64_to_cpu(
                     a->data.non_resident.allocated_size);
             /*
              * Verify the number of mft records does not exceed
              * 2^32 - 1.
              */
             if ((vi->i_size >> vol->mft_record_size_bits) >=
                     (1ULL << 32)) {
                 ntfs_error(sb, "$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 = GLOBAL_ROOT_UID;
             vi->i_gid = GLOBAL_ROOT_GID;
             /* 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(a->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(
                 a->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. "
                 "$MFT is corrupt. Run chkdsk.");
         goto put_err_out;
     }
     if (!a) {
         ntfs_error(sb, "$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);
 
     /*
      * Split the locking rules of the MFT inode from the
      * locking rules of other inodes:
      */
     lockdep_set_class(&ni->runlist.lock, &mft_ni_runlist_lock_key);
     lockdep_set_class(&ni->mrec_lock, &mft_ni_mrec_lock_key);
 
     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;
 }
 
 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_evict_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_evict_big_inode(struct inode *vi)
 {
     ntfs_inode *ni = NTFS_I(vi);
 
     truncate_inode_pages_final(&vi->i_data);
     clear_inode(vi);
 
 #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;
         }
     }
     BUG_ON(ni->page);
     if (!atomic_dec_and_test(&ni->count))
         BUG();
     return;
 }
 
 /**
  * ntfs_show_options - show mount options in /proc/mounts
  * @sf:     seq_file in which to write our mount options
  * @root:   root of the mounted tree 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 fs specified by @root are written to the seq file
  * @sf and success is returned.
  */
 int ntfs_show_options(struct seq_file *sf, struct dentry *root)
 {
     ntfs_volume *vol = NTFS_SB(root->d_sb);
     int i;
 
     seq_printf(sf, ",uid=%i", from_kuid_munged(&init_user_ns, vol->uid));
     seq_printf(sf, ",gid=%i", from_kgid_munged(&init_user_ns, 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");
     if (!NVolSparseEnabled(vol))
         seq_printf(sf, ",disable_sparse");
     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
 
 static const char *es = "  Leaving inconsistent metadata.  Unmount and run "
         "chkdsk.";
 
 /**
  * ntfs_truncate - called when the i_size of an ntfs inode is changed
  * @vi:     inode for which the i_size was changed
  *
  * We only support i_size changes for normal files at present, i.e. not
  * compressed and not encrypted.  This is enforced in ntfs_setattr(), see
  * below.
  *
  * 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_mutex held.
  */
 int ntfs_truncate(struct inode *vi)
 {
     s64 new_size, old_size, nr_freed, new_alloc_size, old_alloc_size;
     VCN highest_vcn;
     unsigned long flags;
     ntfs_inode *base_ni, *ni = NTFS_I(vi);
     ntfs_volume *vol = ni->vol;
     ntfs_attr_search_ctx *ctx;
     MFT_RECORD *m;
     ATTR_RECORD *a;
     const char *te = "  Leaving file length out of sync with i_size.";
     int err, mp_size, size_change, alloc_change;
 
     ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
     BUG_ON(NInoAttr(ni));
     BUG_ON(S_ISDIR(vi->i_mode));
     BUG_ON(NInoMstProtected(ni));
     BUG_ON(ni->nr_extents < 0);
 retry_truncate:
     /*
      * Lock the runlist for writing and map the mft record to ensure it is
      * safe to mess with the attribute runlist and sizes.
      */
     down_write(&ni->runlist.lock);
     if (!NInoAttr(ni))
         base_ni = ni;
     else
         base_ni = ni->ext.base_ntfs_ino;
     m = map_mft_record(base_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 old_bad_out;
     }
     ctx = ntfs_attr_get_search_ctx(base_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 old_bad_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.%s", vi->i_ino, te);
             err = -EIO;
         } else
             ntfs_error(vi->i_sb, "Failed to lookup attribute in "
                     "inode 0x%lx (error code %d).%s",
                     vi->i_ino, err, te);
         goto old_bad_out;
     }
     m = ctx->mrec;
     a = ctx->attr;
     /*
      * The i_size of the vfs inode is the new size for the attribute value.
      */
     new_size = i_size_read(vi);
     /* The current size of the attribute value is the old size. */
     old_size = ntfs_attr_size(a);
     /* Calculate the new allocated size. */
     if (NInoNonResident(ni))
         new_alloc_size = (new_size + vol->cluster_size - 1) &
                 ~(s64)vol->cluster_size_mask;
     else
         new_alloc_size = (new_size + 7) & ~7;
     /* The current allocated size is the old allocated size. */
     read_lock_irqsave(&ni->size_lock, flags);
     old_alloc_size = ni->allocated_size;
     read_unlock_irqrestore(&ni->size_lock, flags);
     /*
      * The change in the file size.  This will be 0 if no change, >0 if the
      * size is growing, and <0 if the size is shrinking.
      */
     size_change = -1;
     if (new_size - old_size >= 0) {
         size_change = 1;
         if (new_size == old_size)
             size_change = 0;
     }
     /* As above for the allocated size. */
     alloc_change = -1;
     if (new_alloc_size - old_alloc_size >= 0) {
         alloc_change = 1;
         if (new_alloc_size == old_alloc_size)
             alloc_change = 0;
     }
     /*
      * If neither the size nor the allocation are being changed there is
      * nothing to do.
      */
     if (!size_change && !alloc_change)
         goto unm_done;
     /* If the size is changing, check if new size is allowed in $AttrDef. */
     if (size_change) {
         err = ntfs_attr_size_bounds_check(vol, ni->type, new_size);
         if (unlikely(err)) {
             if (err == -ERANGE) {
                 ntfs_error(vol->sb, "Truncate would cause the "
                         "inode 0x%lx to %simum size "
                         "for its attribute type "
                         "(0x%x).  Aborting truncate.",
                         vi->i_ino,
                         new_size > old_size ? "exceed "
                         "the max" : "go under the min",
                         le32_to_cpu(ni->type));
                 err = -EFBIG;
             } else {
                 ntfs_error(vol->sb, "Inode 0x%lx has unknown "
                         "attribute type 0x%x.  "
                         "Aborting truncate.",
                         vi->i_ino,
                         le32_to_cpu(ni->type));
                 err = -EIO;
             }
             /* Reset the vfs inode size to the old size. */
             i_size_write(vi, old_size);
             goto err_out;
         }
     }
     if (NInoCompressed(ni) || NInoEncrypted(ni)) {
         ntfs_warning(vi->i_sb, "Changes in inode size are not "
                 "supported yet for %s files, ignoring.",
                 NInoCompressed(ni) ? "compressed" :
                 "encrypted");
         err = -EOPNOTSUPP;
         goto bad_out;
     }
     if (a->non_resident)
         goto do_non_resident_truncate;
     BUG_ON(NInoNonResident(ni));
     /* Resize the attribute record to best fit the new attribute size. */
     if (new_size < vol->mft_record_size &&
             !ntfs_resident_attr_value_resize(m, a, new_size)) {
         /* The resize succeeded! */
         flush_dcache_mft_record_page(ctx->ntfs_ino);
         mark_mft_record_dirty(ctx->ntfs_ino);
         write_lock_irqsave(&ni->size_lock, flags);
         /* Update the sizes in the ntfs inode and all is done. */
         ni->allocated_size = le32_to_cpu(a->length) -
                 le16_to_cpu(a->data.resident.value_offset);
         /*
          * Note ntfs_resident_attr_value_resize() has already done any
          * necessary data clearing in the attribute record.  When the
          * file is being shrunk vmtruncate() will already have cleared
          * the top part of the last partial page, i.e. since this is
          * the resident case this is the page with index 0.  However,
          * when the file is being expanded, the page cache page data
          * between the old data_size, i.e. old_size, and the new_size
          * has not been zeroed.  Fortunately, we do not need to zero it
          * either since on one hand it will either already be zero due
          * to both read_folio and writepage clearing partial page data
          * beyond i_size in which case there is nothing to do or in the
          * case of the file being mmap()ped at the same time, POSIX
          * specifies that the behaviour is unspecified thus we do not
          * have to do anything.  This means that in our implementation
          * in the rare case that the file is mmap()ped and a write
          * occurred into the mmap()ped region just beyond the file size
          * and writepage has not yet been called to write out the page
          * (which would clear the area beyond the file size) and we now
          * extend the file size to incorporate this dirty region
          * outside the file size, a write of the page would result in
          * this data being written to disk instead of being cleared.
          * Given both POSIX and the Linux mmap(2) man page specify that
          * this corner case is undefined, we choose to leave it like
          * that as this is much simpler for us as we cannot lock the
          * relevant page now since we are holding too many ntfs locks
          * which would result in a lock reversal deadlock.
          */
         ni->initialized_size = new_size;
         write_unlock_irqrestore(&ni->size_lock, flags);
         goto unm_done;
     }
     /* If the above resize failed, this must be an attribute extension. */
     BUG_ON(size_change < 0);
     /*
      * We have to drop all the locks so we can call
      * ntfs_attr_make_non_resident().  This could be optimised by try-
      * locking the first page cache page and only if that fails dropping
      * the locks, locking the page, and redoing all the locking and
      * lookups.  While this would be a huge optimisation, it is not worth
      * it as this is definitely a slow code path as it only ever can happen
      * once for any given file.
      */
     ntfs_attr_put_search_ctx(ctx);
     unmap_mft_record(base_ni);
     up_write(&ni->runlist.lock);
     /*
      * Not enough space in the mft record, try to make the attribute
      * non-resident and if successful restart the truncation process.
      */
     err = ntfs_attr_make_non_resident(ni, old_size);
     if (likely(!err))
         goto retry_truncate;
     /*
      * Could not make non-resident.  If this is due to this not being
      * permitted for this attribute type or there not being enough space,
      * try to make other attributes non-resident.  Otherwise fail.
      */
     if (unlikely(err != -EPERM && err != -ENOSPC)) {
         ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, attribute "
                 "type 0x%x, because the conversion from "
                 "resident to non-resident attribute failed "
                 "with error code %i.", vi->i_ino,
                 (unsigned)le32_to_cpu(ni->type), err);
         if (err != -ENOMEM)
             err = -EIO;
         goto conv_err_out;
     }
     /* TODO: Not implemented from here, abort. */
     if (err == -ENOSPC)
         ntfs_error(vol->sb, "Not enough space in the mft record/on "
                 "disk for the non-resident attribute value.  "
                 "This case is not implemented yet.");
     else /* if (err == -EPERM) */
         ntfs_error(vol->sb, "This attribute type may not be "
                 "non-resident.  This case is not implemented "
                 "yet.");
     err = -EOPNOTSUPP;
     goto conv_err_out;
 #if 0
     // TODO: Attempt to make other attributes non-resident.
     if (!err)
         goto do_resident_extend;
     /*
      * Both the attribute list attribute and the standard information
      * attribute must remain in the base inode.  Thus, if this is one of
      * these attributes, we have to try to move other attributes out into
      * extent mft records instead.
      */
     if (ni->type == AT_ATTRIBUTE_LIST ||
             ni->type == AT_STANDARD_INFORMATION) {
         // TODO: Attempt to move other attributes into extent mft
         // records.
         err = -EOPNOTSUPP;
         if (!err)
             goto do_resident_extend;
         goto err_out;
     }
     // TODO: Attempt to move this attribute to an extent mft record, but
     // only if it is not already the only attribute in an mft record in
     // which case there would be nothing to gain.
     err = -EOPNOTSUPP;
     if (!err)
         goto do_resident_extend;
     /* There is nothing we can do to make enough space. )-: */
     goto err_out;
 #endif
 do_non_resident_truncate:
     BUG_ON(!NInoNonResident(ni));
     if (alloc_change < 0) {
         highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn);
         if (highest_vcn > 0 &&
                 old_alloc_size >> vol->cluster_size_bits >
                 highest_vcn + 1) {
             /*
              * This attribute has multiple extents.  Not yet
              * supported.
              */
             ntfs_error(vol->sb, "Cannot truncate inode 0x%lx, "
                     "attribute type 0x%x, because the "
                     "attribute is highly fragmented (it "
                     "consists of multiple extents) and "
                     "this case is not implemented yet.",
                     vi->i_ino,
                     (unsigned)le32_to_cpu(ni->type));
             err = -EOPNOTSUPP;
             goto bad_out;
         }
     }
     /*
      * If the size is shrinking, need to reduce the initialized_size and
      * the data_size before reducing the allocation.
      */
     if (size_change < 0) {
         /*
          * Make the valid size smaller (i_size is already up-to-date).
          */
         write_lock_irqsave(&ni->size_lock, flags);
         if (new_size < ni->initialized_size) {
             ni->initialized_size = new_size;
             a->data.non_resident.initialized_size =
                     cpu_to_sle64(new_size);
         }
         a->data.non_resident.data_size = cpu_to_sle64(new_size);
         write_unlock_irqrestore(&ni->size_lock, flags);
         flush_dcache_mft_record_page(ctx->ntfs_ino);
         mark_mft_record_dirty(ctx->ntfs_ino);
         /* If the allocated size is not changing, we are done. */
         if (!alloc_change)
             goto unm_done;
         /*
          * If the size is shrinking it makes no sense for the
          * allocation to be growing.
          */
         BUG_ON(alloc_change > 0);
     } else /* if (size_change >= 0) */ {
         /*
          * The file size is growing or staying the same but the
          * allocation can be shrinking, growing or staying the same.
          */
         if (alloc_change > 0) {
             /*
              * We need to extend the allocation and possibly update
              * the data size.  If we are updating the data size,
              * since we are not touching the initialized_size we do
              * not need to worry about the actual data on disk.
              * And as far as the page cache is concerned, there
              * will be no pages beyond the old data size and any
              * partial region in the last page between the old and
              * new data size (or the end of the page if the new
              * data size is outside the page) does not need to be
              * modified as explained above for the resident
              * attribute truncate case.  To do this, we simply drop
              * the locks we hold and leave all the work to our
              * friendly helper ntfs_attr_extend_allocation().
              */
             ntfs_attr_put_search_ctx(ctx);
             unmap_mft_record(base_ni);
             up_write(&ni->runlist.lock);
             err = ntfs_attr_extend_allocation(ni, new_size,
                     size_change > 0 ? new_size : -1, -1);
             /*
              * ntfs_attr_extend_allocation() will have done error
              * output already.
              */
             goto done;
         }
         if (!alloc_change)
             goto alloc_done;
     }
     /* alloc_change < 0 */
     /* Free the clusters. */
     nr_freed = ntfs_cluster_free(ni, new_alloc_size >>
             vol->cluster_size_bits, -1, ctx);
     m = ctx->mrec;
     a = ctx->attr;
     if (unlikely(nr_freed < 0)) {
         ntfs_error(vol->sb, "Failed to release cluster(s) (error code "
                 "%lli).  Unmount and run chkdsk to recover "
                 "the lost cluster(s).", (long long)nr_freed);
         NVolSetErrors(vol);
         nr_freed = 0;
     }
     /* Truncate the runlist. */
     err = ntfs_rl_truncate_nolock(vol, &ni->runlist,
             new_alloc_size >> vol->cluster_size_bits);
     /*
      * If the runlist truncation failed and/or the search context is no
      * longer valid, we cannot resize the attribute record or build the
      * mapping pairs array thus we mark the inode bad so that no access to
      * the freed clusters can happen.
      */
     if (unlikely(err || IS_ERR(m))) {
         ntfs_error(vol->sb, "Failed to %s (error code %li).%s",
                 IS_ERR(m) ?
                 "restore attribute search context" :
                 "truncate attribute runlist",
                 IS_ERR(m) ? PTR_ERR(m) : err, es);
         err = -EIO;
         goto bad_out;
     }
     /* Get the size for the shrunk mapping pairs array for the runlist. */
     mp_size = ntfs_get_size_for_mapping_pairs(vol, ni->runlist.rl, 0, -1);
     if (unlikely(mp_size <= 0)) {
         ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
                 "attribute type 0x%x, because determining the "
                 "size for the mapping pairs failed with error "
                 "code %i.%s", vi->i_ino,
                 (unsigned)le32_to_cpu(ni->type), mp_size, es);
         err = -EIO;
         goto bad_out;
     }
     /*
      * Shrink the attribute record for the new mapping pairs array.  Note,
      * this cannot fail since we are making the attribute smaller thus by
      * definition there is enough space to do so.
      */
     err = ntfs_attr_record_resize(m, a, mp_size +
             le16_to_cpu(a->data.non_resident.mapping_pairs_offset));
     BUG_ON(err);
     /*
      * Generate the mapping pairs array directly into the attribute record.
      */
     err = ntfs_mapping_pairs_build(vol, (u8*)a +
             le16_to_cpu(a->data.non_resident.mapping_pairs_offset),
             mp_size, ni->runlist.rl, 0, -1, NULL);
     if (unlikely(err)) {
         ntfs_error(vol->sb, "Cannot shrink allocation of inode 0x%lx, "
                 "attribute type 0x%x, because building the "
                 "mapping pairs failed with error code %i.%s",
                 vi->i_ino, (unsigned)le32_to_cpu(ni->type),
                 err, es);
         err = -EIO;
         goto bad_out;
     }
     /* Update the allocated/compressed size as well as the highest vcn. */
     a->data.non_resident.highest_vcn = cpu_to_sle64((new_alloc_size >>
             vol->cluster_size_bits) - 1);
     write_lock_irqsave(&ni->size_lock, flags);
     ni->allocated_size = new_alloc_size;
     a->data.non_resident.allocated_size = cpu_to_sle64(new_alloc_size);
     if (NInoSparse(ni) || NInoCompressed(ni)) {
         if (nr_freed) {
             ni->itype.compressed.size -= nr_freed <<
                     vol->cluster_size_bits;
             BUG_ON(ni->itype.compressed.size < 0);
             a->data.non_resident.compressed_size = cpu_to_sle64(
                     ni->itype.compressed.size);
             vi->i_blocks = ni->itype.compressed.size >> 9;
         }
     } else
         vi->i_blocks = new_alloc_size >> 9;
     write_unlock_irqrestore(&ni->size_lock, flags);
     /*
      * We have shrunk the allocation.  If this is a shrinking truncate we
      * have already dealt with the initialized_size and the data_size above
      * and we are done.  If the truncate is only changing the allocation
      * and not the data_size, we are also done.  If this is an extending
      * truncate, need to extend the data_size now which is ensured by the
      * fact that @size_change is positive.
      */
 alloc_done:
     /*
      * If the size is growing, need to update it now.  If it is shrinking,
      * we have already updated it above (before the allocation change).
      */
     if (size_change > 0)
         a->data.non_resident.data_size = cpu_to_sle64(new_size);
     /* Ensure the modified mft record is written out. */
     flush_dcache_mft_record_page(ctx->ntfs_ino);
     mark_mft_record_dirty(ctx->ntfs_ino);
 unm_done:
     ntfs_attr_put_search_ctx(ctx);
     unmap_mft_record(base_ni);
     up_write(&ni->runlist.lock);
 done:
     /* Update the mtime and ctime on the base inode. */
     /* normally ->truncate shouldn't update ctime or mtime,
      * but ntfs did before so it got a copy & paste version
      * of file_update_time.  one day someone should fix this
      * for real.
      */
     if (!IS_NOCMTIME(VFS_I(base_ni)) && !IS_RDONLY(VFS_I(base_ni))) {
         struct timespec64 now = current_time(VFS_I(base_ni));
         int sync_it = 0;
 
         if (!timespec64_equal(&VFS_I(base_ni)->i_mtime, &now) ||
             !timespec64_equal(&VFS_I(base_ni)->i_ctime, &now))
             sync_it = 1;
         VFS_I(base_ni)->i_mtime = now;
         VFS_I(base_ni)->i_ctime = now;
 
         if (sync_it)
             mark_inode_dirty_sync(VFS_I(base_ni));
     }
 
     if (likely(!err)) {
         NInoClearTruncateFailed(ni);
         ntfs_debug("Done.");
     }
     return err;
 old_bad_out:
     old_size = -1;
 bad_out:
     if (err != -ENOMEM && err != -EOPNOTSUPP)
         NVolSetErrors(vol);
     if (err != -EOPNOTSUPP)
         NInoSetTruncateFailed(ni);
     else if (old_size >= 0)
         i_size_write(vi, old_size);
 err_out:
     if (ctx)
         ntfs_attr_put_search_ctx(ctx);
     if (m)
         unmap_mft_record(base_ni);
     up_write(&ni->runlist.lock);
 out:
     ntfs_debug("Failed.  Returning error code %i.", err);
     return err;
 conv_err_out:
     if (err != -ENOMEM && err != -EOPNOTSUPP)
         NVolSetErrors(vol);
     if (err != -EOPNOTSUPP)
         NInoSetTruncateFailed(ni);
     else
         i_size_write(vi, old_size);
     goto out;
 }
 
 /**
  * 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.
  */
 #ifdef NTFS_RW
 void ntfs_truncate_vfs(struct inode *vi) {
     ntfs_truncate(vi);
 }
 #endif
 
 /**
  * ntfs_setattr - called from notify_change() when an attribute is being changed
  * @mnt_userns: user namespace of the mount the inode was found from
  * @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_mutex held.
  */
 int ntfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
          struct iattr *attr)
 {
     struct inode *vi = d_inode(dentry);
     int err;
     unsigned int ia_valid = attr->ia_valid;
 
     err = setattr_prepare(&init_user_ns, dentry, attr);
     if (err)
         goto out;
     /* 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_inode *ni = NTFS_I(vi);
             /*
              * FIXME: For now we do not support resizing of
              * compressed or encrypted files yet.
              */
             if (NInoCompressed(ni) || NInoEncrypted(ni)) {
                 ntfs_warning(vi->i_sb, "Changes in inode size "
                         "are not supported yet for "
                         "%s files, ignoring.",
                         NInoCompressed(ni) ?
                         "compressed" : "encrypted");
                 err = -EOPNOTSUPP;
             } else {
                 truncate_setsize(vi, attr->ia_size);
                 ntfs_truncate_vfs(vi);
             }
             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, (long long)
                 sle64_to_cpu(si->last_data_change_time),
                 (long long)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, (long long)
                 sle64_to_cpu(si->last_mft_change_time),
                 (long long)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,
                 (long long)sle64_to_cpu(si->last_access_time),
                 (long long)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) {
         flush_dcache_mft_record_page(ctx->ntfs_ino);
         if (!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. */
     mutex_lock(&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;
                 }
             }
         }
     }
     mutex_unlock(&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 %i):  Run chkdsk.", -err);
         NVolSetErrors(ni->vol);
     }
     return err;
 }
 
 #endif /* NTFS_RW */