diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ntfs/inode.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ntfs/inode.c | 3105 |
1 files changed, 0 insertions, 3105 deletions
diff --git a/ANDROID_3.4.5/fs/ntfs/inode.c b/ANDROID_3.4.5/fs/ntfs/inode.c deleted file mode 100644 index 2eaa6665..00000000 --- a/ANDROID_3.4.5/fs/ntfs/inode.c +++ /dev/null @@ -1,3105 +0,0 @@ -/** - * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project. - * - * Copyright (c) 2001-2007 Anton Altaparmakov - * - * This program/include file is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as published - * by the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program/include file is distributed in the hope that it will be - * useful, but WITHOUT ANY WARRANTY; without even the implied warranty - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program (in the main directory of the Linux-NTFS - * distribution in the file COPYING); if not, write to the Free Software - * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/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 - * @na: ntfs attribute which is being tested with - * - * Compare the ntfs attribute embedded in the ntfs specific part of the vfs - * inode @vi for equality with the ntfs attribute @na. - * - * If searching for the normal file/directory inode, set @na->type to AT_UNUSED. - * @na->name and @na->name_len are then ignored. - * - * Return 1 if the attributes match and 0 if not. - * - * NOTE: This function runs with the inode->i_lock spin lock held so it is not - * allowed to sleep. - */ -int ntfs_test_inode(struct inode *vi, ntfs_attr *na) -{ - ntfs_inode *ni; - - if (vi->i_ino != na->mft_no) - return 0; - ni = NTFS_I(vi); - /* If !NInoAttr(ni), @vi is a normal file or directory inode. */ - if (likely(!NInoAttr(ni))) { - /* If not looking for a normal inode this is a mismatch. */ - if (unlikely(na->type != AT_UNUSED)) - return 0; - } else { - /* A fake inode describing an attribute. */ - if (ni->type != na->type) - return 0; - if (ni->name_len != na->name_len) - return 0; - if (na->name_len && memcmp(ni->name, na->name, - na->name_len * sizeof(ntfschar))) - return 0; - } - /* Match! */ - return 1; -} - -/** - * ntfs_init_locked_inode - initialize an inode - * @vi: vfs inode to initialize - * @na: ntfs attribute which to initialize @vi to - * - * Initialize the vfs inode @vi with the values from the ntfs attribute @na in - * order to enable ntfs_test_inode() to do its work. - * - * If initializing the normal file/directory inode, set @na->type to AT_UNUSED. - * In that case, @na->name and @na->name_len should be set to NULL and 0, - * respectively. Although that is not strictly necessary as - * ntfs_read_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, ntfs_attr *na) -{ - ntfs_inode *ni = NTFS_I(vi); - - vi->i_ino = na->mft_no; - - ni->type = na->type; - if (na->type == AT_INDEX_ALLOCATION) - NInoSetMstProtected(ni); - - ni->name = na->name; - ni->name_len = na->name_len; - - /* If initializing a normal inode, we are done. */ - if (likely(na->type == AT_UNUSED)) { - BUG_ON(na->name); - BUG_ON(na->name_len); - return 0; - } - - /* It is a fake inode. */ - NInoSetAttr(ni); - - /* - * We have I30 global constant as an optimization as it is the name - * in >99.9% of named attributes! The other <0.1% incur a GFP_ATOMIC - * allocation but that is ok. And most attributes are unnamed anyway, - * thus the fraction of named attributes with name != I30 is actually - * absolutely tiny. - */ - if (na->name_len && na->name != I30) { - unsigned int i; - - BUG_ON(!na->name); - i = na->name_len * sizeof(ntfschar); - ni->name = 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; -} - -typedef int (*set_t)(struct inode *, void *); -static int ntfs_read_locked_inode(struct inode *vi); -static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi); -static int ntfs_read_locked_index_inode(struct inode *base_vi, - struct inode *vi); - -/** - * ntfs_iget - obtain a struct inode corresponding to a specific normal inode - * @sb: super block of mounted volume - * @mft_no: mft record number / inode number to obtain - * - * Obtain the struct inode corresponding to a specific normal inode (i.e. a - * file or directory). - * - * If the inode is in the cache, it is just returned with an increased - * reference count. Otherwise, a new struct inode is allocated and initialized, - * and finally ntfs_read_locked_inode() is called to read in the inode and - * fill in the remainder of the inode structure. - * - * Return the struct inode on success. Check the return value with IS_ERR() and - * if true, the function failed and the error code is obtained from PTR_ERR(). - */ -struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no) -{ - struct inode *vi; - 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, (test_t)ntfs_test_inode, - (set_t)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, (test_t)ntfs_test_inode, - (set_t)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, (test_t)ntfs_test_inode, - (set_t)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 = kmem_cache_alloc(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; -} - -static void ntfs_i_callback(struct rcu_head *head) -{ - struct inode *inode = container_of(head, struct inode, i_rcu); - kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode)); -} - -void ntfs_destroy_big_inode(struct inode *inode) -{ - ntfs_inode *ni = NTFS_I(inode); - - ntfs_debug("Entering."); - BUG_ON(ni->page); - if (!atomic_dec_and_test(&ni->count)) - BUG(); - call_rcu(&inode->i_rcu, ntfs_i_callback); -} - -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*)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. */ - - /* - * This is for checking whether an inode has changed w.r.t. a file so - * that the file can be updated if necessary (compare with f_version). - */ - vi->i_version = 1; - - vi->i_uid = vol->uid; - vi->i_gid = vol->gid; - vi->i_mode = 0; - - /* - * Initialize the ntfs specific part of @vi special casing - * FILE_MFT which we need to do at mount time. - */ - if (vi->i_ino != FILE_MFT) - ntfs_init_big_inode(vi); - ni = NTFS_I(vi); - - m = map_mft_record(ni); - if (IS_ERR(m)) { - err = PTR_ERR(m); - goto err_out; - } - ctx = ntfs_attr_get_search_ctx(ni, m); - if (!ctx) { - err = -ENOMEM; - goto unm_err_out; - } - - if (!(m->flags & MFT_RECORD_IN_USE)) { - ntfs_error(vi->i_sb, "Inode is not in use!"); - goto unm_err_out; - } - if (m->base_mft_record) { - ntfs_error(vi->i_sb, "Inode is an extent inode!"); - goto unm_err_out; - } - - /* Transfer information from mft record into vfs and ntfs inodes. */ - vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number); - - /* - * FIXME: Keep in mind that link_count is two for files which have both - * a long file name and a short file name as separate entries, so if - * we are hiding short file names this will be too high. Either we need - * to account for the short file names by subtracting them or we need - * to make sure we delete files even though i_nlink is not zero which - * might be tricky due to vfs interactions. Need to think about this - * some more when implementing the unlink command. - */ - 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. */ - 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_CACHE_SIZE) { - ntfs_error(vi->i_sb, "Index block size (%u) > " - "PAGE_CACHE_SIZE (%ld) is not " - "supported. Sorry.", - ni->itype.index.block_size, - PAGE_CACHE_SIZE); - err = -EOPNOTSUPP; - goto unm_err_out; - } - if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) { - ntfs_error(vi->i_sb, "Index block size (%u) < " - "NTFS_BLOCK_SIZE (%i) is not " - "supported. Sorry.", - ni->itype.index.block_size, - NTFS_BLOCK_SIZE); - err = -EOPNOTSUPP; - goto unm_err_out; - } - ni->itype.index.block_size_bits = - ffs(ni->itype.index.block_size) - 1; - /* Determine the size of a vcn in the directory index. */ - if (vol->cluster_size <= ni->itype.index.block_size) { - ni->itype.index.vcn_size = vol->cluster_size; - ni->itype.index.vcn_size_bits = vol->cluster_size_bits; - } else { - ni->itype.index.vcn_size = vol->sector_size; - ni->itype.index.vcn_size_bits = vol->sector_size_bits; - } - - /* Setup the index allocation attribute, even if not present. */ - NInoSetMstProtected(ni); - ni->type = AT_INDEX_ALLOCATION; - ni->name = I30; - ni->name_len = 4; - - if (!(ir->index.flags & LARGE_INDEX)) { - /* No index allocation. */ - vi->i_size = ni->initialized_size = - ni->allocated_size = 0; - /* We are done with the mft record, so we release it. */ - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(ni); - m = NULL; - ctx = NULL; - goto skip_large_dir_stuff; - } /* LARGE_INDEX: Index allocation present. Setup state. */ - NInoSetIndexAllocPresent(ni); - /* Find index allocation attribute. */ - ntfs_attr_reinit_search_ctx(ctx); - err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, I30, 4, - CASE_SENSITIVE, 0, NULL, 0, ctx); - if (unlikely(err)) { - if (err == -ENOENT) - ntfs_error(vi->i_sb, "$INDEX_ALLOCATION " - "attribute is not present but " - "$INDEX_ROOT indicated it is."); - else - ntfs_error(vi->i_sb, "Failed to lookup " - "$INDEX_ALLOCATION " - "attribute."); - goto unm_err_out; - } - 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; - } 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; - } - if (NInoMstProtected(ni)) - vi->i_mapping->a_ops = &ntfs_mst_aops; - else - vi->i_mapping->a_ops = &ntfs_aops; - /* - * The number of 512-byte blocks used on disk (for stat). This is in so - * far inaccurate as it doesn't account for any named streams or other - * special non-resident attributes, but that is how Windows works, too, - * so we are at least consistent with Windows, if not entirely - * consistent with the Linux Way. Doing it the Linux Way would cause a - * significant slowdown as it would involve iterating over all - * attributes in the mft record and adding the allocated/compressed - * sizes of all non-resident attributes present to give us the Linux - * correct size that should go into i_blocks (after division by 512). - */ - if (S_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_version = base_vi->i_version; - 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); - } - if (NInoMstProtected(ni)) - vi->i_mapping->a_ops = &ntfs_mst_aops; - else - vi->i_mapping->a_ops = &ntfs_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_version = base_vi->i_version; - 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_CACHE_SIZE) { - ntfs_error(vi->i_sb, "Index block size (%u) > PAGE_CACHE_SIZE " - "(%ld) is not supported. Sorry.", - ni->itype.index.block_size, PAGE_CACHE_SIZE); - err = -EOPNOTSUPP; - goto unm_err_out; - } - if (ni->itype.index.block_size < NTFS_BLOCK_SIZE) { - ntfs_error(vi->i_sb, "Index block size (%u) < NTFS_BLOCK_SIZE " - "(%i) is not supported. Sorry.", - ni->itype.index.block_size, NTFS_BLOCK_SIZE); - err = -EOPNOTSUPP; - goto unm_err_out; - } - ni->itype.index.block_size_bits = ffs(ni->itype.index.block_size) - 1; - /* Determine the size of a vcn in the index. */ - if (vol->cluster_size <= ni->itype.index.block_size) { - ni->itype.index.vcn_size = vol->cluster_size; - ni->itype.index.vcn_size_bits = vol->cluster_size_bits; - } else { - ni->itype.index.vcn_size = vol->sector_size; - ni->itype.index.vcn_size_bits = vol->sector_size_bits; - } - /* Check for presence of index allocation attribute. */ - if (!(ir->index.flags & LARGE_INDEX)) { - /* No index allocation. */ - vi->i_size = ni->initialized_size = ni->allocated_size = 0; - /* We are done with the mft record, so we release it. */ - ntfs_attr_put_search_ctx(ctx); - unmap_mft_record(base_ni); - m = NULL; - ctx = NULL; - goto skip_large_index_stuff; - } /* LARGE_INDEX: Index allocation present. Setup state. */ - NInoSetIndexAllocPresent(ni); - /* Find index allocation attribute. */ - ntfs_attr_reinit_search_ctx(ctx); - err = ntfs_attr_lookup(AT_INDEX_ALLOCATION, ni->name, ni->name_len, - CASE_SENSITIVE, 0, NULL, 0, ctx); - if (unlikely(err)) { - if (err == -ENOENT) - ntfs_error(vi->i_sb, "$INDEX_ALLOCATION attribute is " - "not present but $INDEX_ROOT " - "indicated it is."); - else - ntfs_error(vi->i_sb, "Failed to lookup " - "$INDEX_ALLOCATION attribute."); - goto unm_err_out; - } - 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_op = NULL; - vi->i_fop = NULL; - vi->i_mapping->a_ops = &ntfs_mst_aops; - vi->i_blocks = ni->allocated_size >> 9; - /* - * Make sure the base inode doesn't go away and attach it to the - * index inode. - */ - igrab(base_vi); - ni->ext.base_ntfs_ino = base_ni; - ni->nr_extents = -1; - - ntfs_debug("Done."); - return 0; -iput_unm_err_out: - iput(bvi); -unm_err_out: - if (!err) - err = -EIO; - if (ctx) - ntfs_attr_put_search_ctx(ctx); - if (m) - unmap_mft_record(base_ni); -err_out: - ntfs_error(vi->i_sb, "Failed with error code %i while reading index " - "inode (mft_no 0x%lx, name_len %i.", err, vi->i_ino, - ni->name_len); - make_bad_inode(vi); - if (err != -EOPNOTSUPP && err != -ENOMEM) - NVolSetErrors(vol); - return err; -} - -/* - * 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); - } - - /* Apply the mst fixups. */ - if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) { - /* FIXME: Try to use the $MFTMirr now. */ - ntfs_error(sb, "MST fixup failed. $MFT is corrupt."); - goto err_out; - } - - /* Need this to sanity check attribute list references to $MFT. */ - vi->i_generation = ni->seq_no = le16_to_cpu(m->sequence_number); - - /* Provides readpage() and sync_page() for map_mft_record(). */ - vi->i_mapping->a_ops = &ntfs_mst_aops; - - ctx = ntfs_attr_get_search_ctx(ni, m); - if (!ctx) { - err = -ENOMEM; - goto err_out; - } - - /* Find the attribute list attribute if present. */ - err = ntfs_attr_lookup(AT_ATTRIBUTE_LIST, NULL, 0, 0, 0, NULL, 0, ctx); - if (err) { - if (unlikely(err != -ENOENT)) { - ntfs_error(sb, "Failed to lookup attribute list " - "attribute. You should run chkdsk."); - goto put_err_out; - } - } else /* if (!err) */ { - ATTR_LIST_ENTRY *al_entry, *next_al_entry; - u8 *al_end; - 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); - 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 = vi->i_gid = 0; - /* Regular file. No access for anyone. */ - vi->i_mode = S_IFREG; - /* No VFS initiated operations allowed for $MFT. */ - vi->i_op = &ntfs_empty_inode_ops; - vi->i_fop = &ntfs_empty_file_ops; - } - - /* Get the lowest vcn for the next extent. */ - highest_vcn = sle64_to_cpu(a->data.non_resident.highest_vcn); - next_vcn = highest_vcn + 1; - - /* Only one extent or error, which we catch below. */ - if (next_vcn <= 0) - break; - - /* Avoid endless loops due to corruption. */ - if (next_vcn < sle64_to_cpu( - a->data.non_resident.lowest_vcn)) { - ntfs_error(sb, "$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(&vi->i_data, 0); - end_writeback(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; - } - } - 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", vol->uid); - seq_printf(sf, ",gid=%i", vol->gid); - if (vol->fmask == vol->dmask) - seq_printf(sf, ",umask=0%o", vol->fmask); - else { - seq_printf(sf, ",fmask=0%o", vol->fmask); - seq_printf(sf, ",dmask=0%o", vol->dmask); - } - seq_printf(sf, ",nls=%s", vol->nls_map->charset); - if (NVolCaseSensitive(vol)) - seq_printf(sf, ",case_sensitive"); - if (NVolShowSystemFiles(vol)) - seq_printf(sf, ",show_sys_files"); - 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; - u32 attr_len; - - 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 readpage 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. - */ - attr_len = le32_to_cpu(a->length); - 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 timespec now = current_fs_time(VFS_I(base_ni)->i_sb); - int sync_it = 0; - - if (!timespec_equal(&VFS_I(base_ni)->i_mtime, &now) || - !timespec_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. - */ -void ntfs_truncate_vfs(struct inode *vi) { - ntfs_truncate(vi); -} - -/** - * ntfs_setattr - called from notify_change() when an attribute is being changed - * @dentry: dentry whose attributes to change - * @attr: structure describing the attributes and the changes - * - * We have to trap VFS attempts to truncate the file described by @dentry as - * soon as possible, because we do not implement changes in i_size yet. So we - * abort all i_size changes here. - * - * We also abort all changes of user, group, and mode as we do not implement - * the NTFS ACLs yet. - * - * Called with ->i_mutex held. - */ -int ntfs_setattr(struct dentry *dentry, struct iattr *attr) -{ - struct inode *vi = dentry->d_inode; - int err; - unsigned int ia_valid = attr->ia_valid; - - err = inode_change_ok(vi, attr); - if (err) - 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 - err = vmtruncate(vi, attr->ia_size); - if (err || ia_valid == ATTR_SIZE) - goto out; - } else { - /* - * We skipped the truncate but must still update - * timestamps. - */ - ia_valid |= ATTR_MTIME | ATTR_CTIME; - } - } - if (ia_valid & ATTR_ATIME) - vi->i_atime = timespec_trunc(attr->ia_atime, - vi->i_sb->s_time_gran); - if (ia_valid & ATTR_MTIME) - vi->i_mtime = timespec_trunc(attr->ia_mtime, - vi->i_sb->s_time_gran); - if (ia_valid & ATTR_CTIME) - vi->i_ctime = timespec_trunc(attr->ia_ctime, - vi->i_sb->s_time_gran); - 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 */ |