diff options
Diffstat (limited to 'fs/ntfs')
| -rw-r--r-- | fs/ntfs/Makefile | 2 | ||||
| -rw-r--r-- | fs/ntfs/aops.c | 163 | ||||
| -rw-r--r-- | fs/ntfs/inode.c | 19 | ||||
| -rw-r--r-- | fs/ntfs/ntfs.h | 8 |
4 files changed, 167 insertions, 25 deletions
diff --git a/fs/ntfs/Makefile b/fs/ntfs/Makefile index 30206b238433..36ae529511c4 100644 --- a/fs/ntfs/Makefile +++ b/fs/ntfs/Makefile @@ -8,7 +8,7 @@ ntfs-y := aops.o attrib.o collate.o compress.o debug.o dir.o file.o \ ntfs-$(CONFIG_NTFS_RW) += bitmap.o lcnalloc.o logfile.o quota.o usnjrnl.o -ccflags-y := -DNTFS_VERSION=\"2.1.30\" +ccflags-y := -DNTFS_VERSION=\"2.1.31\" ccflags-$(CONFIG_NTFS_DEBUG) += -DDEBUG ccflags-$(CONFIG_NTFS_RW) += -DNTFS_RW diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index d267ea6aa1a0..7521e11db728 100644 --- a/fs/ntfs/aops.c +++ b/fs/ntfs/aops.c @@ -1,8 +1,7 @@ /** * aops.c - NTFS kernel address space operations and page cache handling. - * Part of the Linux-NTFS project. * - * Copyright (c) 2001-2007 Anton Altaparmakov + * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc. * Copyright (c) 2002 Richard Russon * * This program/include file is free software; you can redistribute it and/or @@ -1539,16 +1538,157 @@ err_out: #endif /* NTFS_RW */ /** - * ntfs_aops - general address space operations for inodes and attributes + * ntfs_bmap - map logical file block to physical device block + * @mapping: address space mapping to which the block to be mapped belongs + * @block: logical block to map to its physical device block + * + * For regular, non-resident files (i.e. not compressed and not encrypted), map + * the logical @block belonging to the file described by the address space + * mapping @mapping to its physical device block. + * + * The size of the block is equal to the @s_blocksize field of the super block + * of the mounted file system which is guaranteed to be smaller than or equal + * to the cluster size thus the block is guaranteed to fit entirely inside the + * cluster which means we do not need to care how many contiguous bytes are + * available after the beginning of the block. + * + * Return the physical device block if the mapping succeeded or 0 if the block + * is sparse or there was an error. + * + * Note: This is a problem if someone tries to run bmap() on $Boot system file + * as that really is in block zero but there is nothing we can do. bmap() is + * just broken in that respect (just like it cannot distinguish sparse from + * not available or error). */ -const struct address_space_operations ntfs_aops = { - .readpage = ntfs_readpage, /* Fill page with data. */ +static sector_t ntfs_bmap(struct address_space *mapping, sector_t block) +{ + s64 ofs, size; + loff_t i_size; + LCN lcn; + unsigned long blocksize, flags; + ntfs_inode *ni = NTFS_I(mapping->host); + ntfs_volume *vol = ni->vol; + unsigned delta; + unsigned char blocksize_bits, cluster_size_shift; + + ntfs_debug("Entering for mft_no 0x%lx, logical block 0x%llx.", + ni->mft_no, (unsigned long long)block); + if (ni->type != AT_DATA || !NInoNonResident(ni) || NInoEncrypted(ni)) { + ntfs_error(vol->sb, "BMAP does not make sense for %s " + "attributes, returning 0.", + (ni->type != AT_DATA) ? "non-data" : + (!NInoNonResident(ni) ? "resident" : + "encrypted")); + return 0; + } + /* None of these can happen. */ + BUG_ON(NInoCompressed(ni)); + BUG_ON(NInoMstProtected(ni)); + blocksize = vol->sb->s_blocksize; + blocksize_bits = vol->sb->s_blocksize_bits; + ofs = (s64)block << blocksize_bits; + read_lock_irqsave(&ni->size_lock, flags); + size = ni->initialized_size; + i_size = i_size_read(VFS_I(ni)); + read_unlock_irqrestore(&ni->size_lock, flags); + /* + * If the offset is outside the initialized size or the block straddles + * the initialized size then pretend it is a hole unless the + * initialized size equals the file size. + */ + if (unlikely(ofs >= size || (ofs + blocksize > size && size < i_size))) + goto hole; + cluster_size_shift = vol->cluster_size_bits; + down_read(&ni->runlist.lock); + lcn = ntfs_attr_vcn_to_lcn_nolock(ni, ofs >> cluster_size_shift, false); + up_read(&ni->runlist.lock); + if (unlikely(lcn < LCN_HOLE)) { + /* + * Step down to an integer to avoid gcc doing a long long + * comparision in the switch when we know @lcn is between + * LCN_HOLE and LCN_EIO (i.e. -1 to -5). + * + * Otherwise older gcc (at least on some architectures) will + * try to use __cmpdi2() which is of course not available in + * the kernel. + */ + switch ((int)lcn) { + case LCN_ENOENT: + /* + * If the offset is out of bounds then pretend it is a + * hole. + */ + goto hole; + case LCN_ENOMEM: + ntfs_error(vol->sb, "Not enough memory to complete " + "mapping for inode 0x%lx. " + "Returning 0.", ni->mft_no); + break; + default: + ntfs_error(vol->sb, "Failed to complete mapping for " + "inode 0x%lx. Run chkdsk. " + "Returning 0.", ni->mft_no); + break; + } + return 0; + } + if (lcn < 0) { + /* It is a hole. */ +hole: + ntfs_debug("Done (returning hole)."); + return 0; + } + /* + * The block is really allocated and fullfils all our criteria. + * Convert the cluster to units of block size and return the result. + */ + delta = ofs & vol->cluster_size_mask; + if (unlikely(sizeof(block) < sizeof(lcn))) { + block = lcn = ((lcn << cluster_size_shift) + delta) >> + blocksize_bits; + /* If the block number was truncated return 0. */ + if (unlikely(block != lcn)) { + ntfs_error(vol->sb, "Physical block 0x%llx is too " + "large to be returned, returning 0.", + (long long)lcn); + return 0; + } + } else + block = ((lcn << cluster_size_shift) + delta) >> + blocksize_bits; + ntfs_debug("Done (returning block 0x%llx).", (unsigned long long)lcn); + return block; +} + +/** + * ntfs_normal_aops - address space operations for normal inodes and attributes + * + * Note these are not used for compressed or mst protected inodes and + * attributes. + */ +const struct address_space_operations ntfs_normal_aops = { + .readpage = ntfs_readpage, #ifdef NTFS_RW - .writepage = ntfs_writepage, /* Write dirty page to disk. */ + .writepage = ntfs_writepage, + .set_page_dirty = __set_page_dirty_buffers, +#endif /* NTFS_RW */ + .bmap = ntfs_bmap, + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, + .error_remove_page = generic_error_remove_page, +}; + +/** + * ntfs_compressed_aops - address space operations for compressed inodes + */ +const struct address_space_operations ntfs_compressed_aops = { + .readpage = ntfs_readpage, +#ifdef NTFS_RW + .writepage = ntfs_writepage, + .set_page_dirty = __set_page_dirty_buffers, #endif /* NTFS_RW */ - .migratepage = buffer_migrate_page, /* Move a page cache page from - one physical page to an - other. */ + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, .error_remove_page = generic_error_remove_page, }; @@ -1564,9 +1704,8 @@ const struct address_space_operations ntfs_mst_aops = { without touching the buffers belonging to the page. */ #endif /* NTFS_RW */ - .migratepage = buffer_migrate_page, /* Move a page cache page from - one physical page to an - other. */ + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, .error_remove_page = generic_error_remove_page, }; diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c index f47af5e6e230..898b9949d363 100644 --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -1,7 +1,7 @@ /** - * inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project. + * inode.c - NTFS kernel inode handling. * - * Copyright (c) 2001-2007 Anton Altaparmakov + * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc. * * 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 @@ -1012,6 +1012,7 @@ skip_large_dir_stuff: /* Setup the operations for this inode. */ vi->i_op = &ntfs_dir_inode_ops; vi->i_fop = &ntfs_dir_ops; + vi->i_mapping->a_ops = &ntfs_mst_aops; } else { /* It is a file. */ ntfs_attr_reinit_search_ctx(ctx); @@ -1160,11 +1161,12 @@ no_data_attr_special_case: /* Setup the operations for this inode. */ vi->i_op = &ntfs_file_inode_ops; vi->i_fop = &ntfs_file_ops; + vi->i_mapping->a_ops = &ntfs_normal_aops; + if (NInoMstProtected(ni)) + vi->i_mapping->a_ops = &ntfs_mst_aops; + else if (NInoCompressed(ni)) + vi->i_mapping->a_ops = &ntfs_compressed_aops; } - 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 @@ -1414,10 +1416,11 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi) ni->allocated_size = sle64_to_cpu( a->data.non_resident.allocated_size); } + vi->i_mapping->a_ops = &ntfs_normal_aops; if (NInoMstProtected(ni)) vi->i_mapping->a_ops = &ntfs_mst_aops; - else - vi->i_mapping->a_ops = &ntfs_aops; + else if (NInoCompressed(ni)) + vi->i_mapping->a_ops = &ntfs_compressed_aops; if ((NInoCompressed(ni) || NInoSparse(ni)) && ni->type != AT_INDEX_ROOT) vi->i_blocks = ni->itype.compressed.size >> 9; else diff --git a/fs/ntfs/ntfs.h b/fs/ntfs/ntfs.h index d6a340bf80fc..c581e26a350d 100644 --- a/fs/ntfs/ntfs.h +++ b/fs/ntfs/ntfs.h @@ -1,8 +1,7 @@ /* - * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS - * project. + * ntfs.h - Defines for NTFS Linux kernel driver. * - * Copyright (c) 2001-2005 Anton Altaparmakov + * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc. * Copyright (C) 2002 Richard Russon * * This program/include file is free software; you can redistribute it and/or @@ -57,7 +56,8 @@ extern struct kmem_cache *ntfs_attr_ctx_cache; extern struct kmem_cache *ntfs_index_ctx_cache; /* The various operations structs defined throughout the driver files. */ -extern const struct address_space_operations ntfs_aops; +extern const struct address_space_operations ntfs_normal_aops; +extern const struct address_space_operations ntfs_compressed_aops; extern const struct address_space_operations ntfs_mst_aops; extern const struct file_operations ntfs_file_ops; |