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628 lines
16 KiB
628 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hfsplus/extents.c |
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* |
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* Copyright (C) 2001 |
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* Brad Boyer ([email protected]) |
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* (C) 2003 Ardis Technologies <[email protected]> |
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* |
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* Handling of Extents both in catalog and extents overflow trees |
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*/ |
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|
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/pagemap.h> |
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|
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#include "hfsplus_fs.h" |
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#include "hfsplus_raw.h" |
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|
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/* Compare two extents keys, returns 0 on same, pos/neg for difference */ |
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int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1, |
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const hfsplus_btree_key *k2) |
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{ |
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__be32 k1id, k2id; |
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__be32 k1s, k2s; |
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|
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k1id = k1->ext.cnid; |
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k2id = k2->ext.cnid; |
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if (k1id != k2id) |
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return be32_to_cpu(k1id) < be32_to_cpu(k2id) ? -1 : 1; |
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if (k1->ext.fork_type != k2->ext.fork_type) |
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return k1->ext.fork_type < k2->ext.fork_type ? -1 : 1; |
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k1s = k1->ext.start_block; |
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k2s = k2->ext.start_block; |
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if (k1s == k2s) |
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return 0; |
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return be32_to_cpu(k1s) < be32_to_cpu(k2s) ? -1 : 1; |
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} |
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static void hfsplus_ext_build_key(hfsplus_btree_key *key, u32 cnid, |
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u32 block, u8 type) |
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{ |
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key->key_len = cpu_to_be16(HFSPLUS_EXT_KEYLEN - 2); |
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key->ext.cnid = cpu_to_be32(cnid); |
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key->ext.start_block = cpu_to_be32(block); |
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key->ext.fork_type = type; |
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key->ext.pad = 0; |
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} |
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static u32 hfsplus_ext_find_block(struct hfsplus_extent *ext, u32 off) |
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{ |
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int i; |
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u32 count; |
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for (i = 0; i < 8; ext++, i++) { |
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count = be32_to_cpu(ext->block_count); |
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if (off < count) |
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return be32_to_cpu(ext->start_block) + off; |
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off -= count; |
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} |
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/* panic? */ |
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return 0; |
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} |
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static int hfsplus_ext_block_count(struct hfsplus_extent *ext) |
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{ |
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int i; |
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u32 count = 0; |
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for (i = 0; i < 8; ext++, i++) |
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count += be32_to_cpu(ext->block_count); |
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return count; |
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} |
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static u32 hfsplus_ext_lastblock(struct hfsplus_extent *ext) |
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{ |
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int i; |
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ext += 7; |
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for (i = 0; i < 7; ext--, i++) |
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if (ext->block_count) |
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break; |
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return be32_to_cpu(ext->start_block) + be32_to_cpu(ext->block_count); |
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} |
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static int __hfsplus_ext_write_extent(struct inode *inode, |
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struct hfs_find_data *fd) |
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{ |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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int res; |
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WARN_ON(!mutex_is_locked(&hip->extents_lock)); |
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hfsplus_ext_build_key(fd->search_key, inode->i_ino, hip->cached_start, |
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HFSPLUS_IS_RSRC(inode) ? |
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HFSPLUS_TYPE_RSRC : HFSPLUS_TYPE_DATA); |
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res = hfs_brec_find(fd, hfs_find_rec_by_key); |
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if (hip->extent_state & HFSPLUS_EXT_NEW) { |
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if (res != -ENOENT) |
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return res; |
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/* Fail early and avoid ENOSPC during the btree operation */ |
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res = hfs_bmap_reserve(fd->tree, fd->tree->depth + 1); |
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if (res) |
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return res; |
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hfs_brec_insert(fd, hip->cached_extents, |
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sizeof(hfsplus_extent_rec)); |
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hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
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} else { |
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if (res) |
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return res; |
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hfs_bnode_write(fd->bnode, hip->cached_extents, |
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fd->entryoffset, fd->entrylength); |
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hip->extent_state &= ~HFSPLUS_EXT_DIRTY; |
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} |
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/* |
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* We can't just use hfsplus_mark_inode_dirty here, because we |
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* also get called from hfsplus_write_inode, which should not |
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* redirty the inode. Instead the callers have to be careful |
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* to explicily mark the inode dirty, too. |
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*/ |
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set_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags); |
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return 0; |
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} |
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static int hfsplus_ext_write_extent_locked(struct inode *inode) |
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{ |
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int res = 0; |
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if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) { |
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struct hfs_find_data fd; |
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res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd); |
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if (res) |
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return res; |
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res = __hfsplus_ext_write_extent(inode, &fd); |
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hfs_find_exit(&fd); |
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} |
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return res; |
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} |
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int hfsplus_ext_write_extent(struct inode *inode) |
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{ |
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int res; |
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mutex_lock(&HFSPLUS_I(inode)->extents_lock); |
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res = hfsplus_ext_write_extent_locked(inode); |
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mutex_unlock(&HFSPLUS_I(inode)->extents_lock); |
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return res; |
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} |
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static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd, |
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struct hfsplus_extent *extent, |
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u32 cnid, u32 block, u8 type) |
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{ |
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int res; |
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hfsplus_ext_build_key(fd->search_key, cnid, block, type); |
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fd->key->ext.cnid = 0; |
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res = hfs_brec_find(fd, hfs_find_rec_by_key); |
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if (res && res != -ENOENT) |
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return res; |
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if (fd->key->ext.cnid != fd->search_key->ext.cnid || |
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fd->key->ext.fork_type != fd->search_key->ext.fork_type) |
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return -ENOENT; |
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if (fd->entrylength != sizeof(hfsplus_extent_rec)) |
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return -EIO; |
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hfs_bnode_read(fd->bnode, extent, fd->entryoffset, |
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sizeof(hfsplus_extent_rec)); |
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return 0; |
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} |
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static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd, |
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struct inode *inode, u32 block) |
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{ |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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int res; |
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WARN_ON(!mutex_is_locked(&hip->extents_lock)); |
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if (hip->extent_state & HFSPLUS_EXT_DIRTY) { |
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res = __hfsplus_ext_write_extent(inode, fd); |
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if (res) |
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return res; |
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} |
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res = __hfsplus_ext_read_extent(fd, hip->cached_extents, inode->i_ino, |
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block, HFSPLUS_IS_RSRC(inode) ? |
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HFSPLUS_TYPE_RSRC : |
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HFSPLUS_TYPE_DATA); |
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if (!res) { |
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hip->cached_start = be32_to_cpu(fd->key->ext.start_block); |
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hip->cached_blocks = |
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hfsplus_ext_block_count(hip->cached_extents); |
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} else { |
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hip->cached_start = hip->cached_blocks = 0; |
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hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
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} |
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return res; |
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} |
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static int hfsplus_ext_read_extent(struct inode *inode, u32 block) |
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{ |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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struct hfs_find_data fd; |
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int res; |
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if (block >= hip->cached_start && |
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block < hip->cached_start + hip->cached_blocks) |
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return 0; |
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res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd); |
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if (!res) { |
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res = __hfsplus_ext_cache_extent(&fd, inode, block); |
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hfs_find_exit(&fd); |
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} |
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return res; |
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} |
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/* Get a block at iblock for inode, possibly allocating if create */ |
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int hfsplus_get_block(struct inode *inode, sector_t iblock, |
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struct buffer_head *bh_result, int create) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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int res = -EIO; |
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u32 ablock, dblock, mask; |
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sector_t sector; |
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int was_dirty = 0; |
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/* Convert inode block to disk allocation block */ |
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ablock = iblock >> sbi->fs_shift; |
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if (iblock >= hip->fs_blocks) { |
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if (!create) |
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return 0; |
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if (iblock > hip->fs_blocks) |
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return -EIO; |
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if (ablock >= hip->alloc_blocks) { |
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res = hfsplus_file_extend(inode, false); |
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if (res) |
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return res; |
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} |
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} else |
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create = 0; |
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if (ablock < hip->first_blocks) { |
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dblock = hfsplus_ext_find_block(hip->first_extents, ablock); |
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goto done; |
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} |
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if (inode->i_ino == HFSPLUS_EXT_CNID) |
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return -EIO; |
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mutex_lock(&hip->extents_lock); |
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/* |
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* hfsplus_ext_read_extent will write out a cached extent into |
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* the extents btree. In that case we may have to mark the inode |
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* dirty even for a pure read of an extent here. |
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*/ |
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was_dirty = (hip->extent_state & HFSPLUS_EXT_DIRTY); |
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res = hfsplus_ext_read_extent(inode, ablock); |
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if (res) { |
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mutex_unlock(&hip->extents_lock); |
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return -EIO; |
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} |
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dblock = hfsplus_ext_find_block(hip->cached_extents, |
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ablock - hip->cached_start); |
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mutex_unlock(&hip->extents_lock); |
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done: |
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hfs_dbg(EXTENT, "get_block(%lu): %llu - %u\n", |
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inode->i_ino, (long long)iblock, dblock); |
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mask = (1 << sbi->fs_shift) - 1; |
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sector = ((sector_t)dblock << sbi->fs_shift) + |
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sbi->blockoffset + (iblock & mask); |
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map_bh(bh_result, sb, sector); |
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if (create) { |
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set_buffer_new(bh_result); |
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hip->phys_size += sb->s_blocksize; |
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hip->fs_blocks++; |
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inode_add_bytes(inode, sb->s_blocksize); |
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} |
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if (create || was_dirty) |
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mark_inode_dirty(inode); |
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return 0; |
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} |
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static void hfsplus_dump_extent(struct hfsplus_extent *extent) |
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{ |
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int i; |
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hfs_dbg(EXTENT, " "); |
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for (i = 0; i < 8; i++) |
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hfs_dbg_cont(EXTENT, " %u:%u", |
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be32_to_cpu(extent[i].start_block), |
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be32_to_cpu(extent[i].block_count)); |
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hfs_dbg_cont(EXTENT, "\n"); |
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} |
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static int hfsplus_add_extent(struct hfsplus_extent *extent, u32 offset, |
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u32 alloc_block, u32 block_count) |
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{ |
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u32 count, start; |
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int i; |
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hfsplus_dump_extent(extent); |
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for (i = 0; i < 8; extent++, i++) { |
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count = be32_to_cpu(extent->block_count); |
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if (offset == count) { |
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start = be32_to_cpu(extent->start_block); |
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if (alloc_block != start + count) { |
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if (++i >= 8) |
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return -ENOSPC; |
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extent++; |
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extent->start_block = cpu_to_be32(alloc_block); |
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} else |
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block_count += count; |
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extent->block_count = cpu_to_be32(block_count); |
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return 0; |
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} else if (offset < count) |
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break; |
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offset -= count; |
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} |
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/* panic? */ |
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return -EIO; |
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} |
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static int hfsplus_free_extents(struct super_block *sb, |
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struct hfsplus_extent *extent, |
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u32 offset, u32 block_nr) |
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{ |
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u32 count, start; |
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int i; |
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int err = 0; |
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/* Mapping the allocation file may lock the extent tree */ |
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WARN_ON(mutex_is_locked(&HFSPLUS_SB(sb)->ext_tree->tree_lock)); |
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hfsplus_dump_extent(extent); |
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for (i = 0; i < 8; extent++, i++) { |
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count = be32_to_cpu(extent->block_count); |
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if (offset == count) |
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goto found; |
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else if (offset < count) |
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break; |
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offset -= count; |
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} |
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/* panic? */ |
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return -EIO; |
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found: |
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for (;;) { |
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start = be32_to_cpu(extent->start_block); |
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if (count <= block_nr) { |
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err = hfsplus_block_free(sb, start, count); |
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if (err) { |
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pr_err("can't free extent\n"); |
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hfs_dbg(EXTENT, " start: %u count: %u\n", |
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start, count); |
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} |
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extent->block_count = 0; |
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extent->start_block = 0; |
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block_nr -= count; |
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} else { |
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count -= block_nr; |
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err = hfsplus_block_free(sb, start + count, block_nr); |
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if (err) { |
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pr_err("can't free extent\n"); |
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hfs_dbg(EXTENT, " start: %u count: %u\n", |
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start, count); |
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} |
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extent->block_count = cpu_to_be32(count); |
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block_nr = 0; |
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} |
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if (!block_nr || !i) { |
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/* |
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* Try to free all extents and |
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* return only last error |
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*/ |
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return err; |
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} |
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i--; |
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extent--; |
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count = be32_to_cpu(extent->block_count); |
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} |
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} |
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int hfsplus_free_fork(struct super_block *sb, u32 cnid, |
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struct hfsplus_fork_raw *fork, int type) |
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{ |
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struct hfs_find_data fd; |
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hfsplus_extent_rec ext_entry; |
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u32 total_blocks, blocks, start; |
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int res, i; |
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total_blocks = be32_to_cpu(fork->total_blocks); |
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if (!total_blocks) |
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return 0; |
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blocks = 0; |
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for (i = 0; i < 8; i++) |
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blocks += be32_to_cpu(fork->extents[i].block_count); |
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res = hfsplus_free_extents(sb, fork->extents, blocks, blocks); |
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if (res) |
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return res; |
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if (total_blocks == blocks) |
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return 0; |
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res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd); |
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if (res) |
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return res; |
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do { |
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res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid, |
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total_blocks, type); |
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if (res) |
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break; |
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start = be32_to_cpu(fd.key->ext.start_block); |
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hfs_brec_remove(&fd); |
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mutex_unlock(&fd.tree->tree_lock); |
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hfsplus_free_extents(sb, ext_entry, total_blocks - start, |
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total_blocks); |
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total_blocks = start; |
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mutex_lock(&fd.tree->tree_lock); |
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} while (total_blocks > blocks); |
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hfs_find_exit(&fd); |
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return res; |
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} |
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int hfsplus_file_extend(struct inode *inode, bool zeroout) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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u32 start, len, goal; |
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int res; |
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if (sbi->alloc_file->i_size * 8 < |
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sbi->total_blocks - sbi->free_blocks + 8) { |
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/* extend alloc file */ |
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pr_err("extend alloc file! (%llu,%u,%u)\n", |
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sbi->alloc_file->i_size * 8, |
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sbi->total_blocks, sbi->free_blocks); |
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return -ENOSPC; |
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} |
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mutex_lock(&hip->extents_lock); |
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if (hip->alloc_blocks == hip->first_blocks) |
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goal = hfsplus_ext_lastblock(hip->first_extents); |
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else { |
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res = hfsplus_ext_read_extent(inode, hip->alloc_blocks); |
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if (res) |
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goto out; |
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goal = hfsplus_ext_lastblock(hip->cached_extents); |
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} |
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len = hip->clump_blocks; |
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start = hfsplus_block_allocate(sb, sbi->total_blocks, goal, &len); |
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if (start >= sbi->total_blocks) { |
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start = hfsplus_block_allocate(sb, goal, 0, &len); |
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if (start >= goal) { |
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res = -ENOSPC; |
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goto out; |
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} |
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} |
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if (zeroout) { |
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res = sb_issue_zeroout(sb, start, len, GFP_NOFS); |
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if (res) |
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goto out; |
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} |
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hfs_dbg(EXTENT, "extend %lu: %u,%u\n", inode->i_ino, start, len); |
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|
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if (hip->alloc_blocks <= hip->first_blocks) { |
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if (!hip->first_blocks) { |
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hfs_dbg(EXTENT, "first extents\n"); |
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/* no extents yet */ |
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hip->first_extents[0].start_block = cpu_to_be32(start); |
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hip->first_extents[0].block_count = cpu_to_be32(len); |
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res = 0; |
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} else { |
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/* try to append to extents in inode */ |
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res = hfsplus_add_extent(hip->first_extents, |
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hip->alloc_blocks, |
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start, len); |
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if (res == -ENOSPC) |
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goto insert_extent; |
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} |
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if (!res) { |
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hfsplus_dump_extent(hip->first_extents); |
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hip->first_blocks += len; |
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} |
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} else { |
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res = hfsplus_add_extent(hip->cached_extents, |
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hip->alloc_blocks - hip->cached_start, |
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start, len); |
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if (!res) { |
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hfsplus_dump_extent(hip->cached_extents); |
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hip->extent_state |= HFSPLUS_EXT_DIRTY; |
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hip->cached_blocks += len; |
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} else if (res == -ENOSPC) |
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goto insert_extent; |
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} |
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out: |
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if (!res) { |
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hip->alloc_blocks += len; |
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mutex_unlock(&hip->extents_lock); |
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hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY); |
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return 0; |
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} |
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mutex_unlock(&hip->extents_lock); |
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return res; |
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|
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insert_extent: |
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hfs_dbg(EXTENT, "insert new extent\n"); |
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res = hfsplus_ext_write_extent_locked(inode); |
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if (res) |
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goto out; |
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|
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memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); |
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hip->cached_extents[0].start_block = cpu_to_be32(start); |
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hip->cached_extents[0].block_count = cpu_to_be32(len); |
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hfsplus_dump_extent(hip->cached_extents); |
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hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW; |
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hip->cached_start = hip->alloc_blocks; |
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hip->cached_blocks = len; |
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|
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res = 0; |
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goto out; |
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} |
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|
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void hfsplus_file_truncate(struct inode *inode) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct hfsplus_inode_info *hip = HFSPLUS_I(inode); |
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struct hfs_find_data fd; |
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u32 alloc_cnt, blk_cnt, start; |
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int res; |
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|
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hfs_dbg(INODE, "truncate: %lu, %llu -> %llu\n", |
|
inode->i_ino, (long long)hip->phys_size, inode->i_size); |
|
|
|
if (inode->i_size > hip->phys_size) { |
|
struct address_space *mapping = inode->i_mapping; |
|
struct page *page; |
|
void *fsdata; |
|
loff_t size = inode->i_size; |
|
|
|
res = pagecache_write_begin(NULL, mapping, size, 0, 0, |
|
&page, &fsdata); |
|
if (res) |
|
return; |
|
res = pagecache_write_end(NULL, mapping, size, |
|
0, 0, page, fsdata); |
|
if (res < 0) |
|
return; |
|
mark_inode_dirty(inode); |
|
return; |
|
} else if (inode->i_size == hip->phys_size) |
|
return; |
|
|
|
blk_cnt = (inode->i_size + HFSPLUS_SB(sb)->alloc_blksz - 1) >> |
|
HFSPLUS_SB(sb)->alloc_blksz_shift; |
|
|
|
mutex_lock(&hip->extents_lock); |
|
|
|
alloc_cnt = hip->alloc_blocks; |
|
if (blk_cnt == alloc_cnt) |
|
goto out_unlock; |
|
|
|
res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd); |
|
if (res) { |
|
mutex_unlock(&hip->extents_lock); |
|
/* XXX: We lack error handling of hfsplus_file_truncate() */ |
|
return; |
|
} |
|
while (1) { |
|
if (alloc_cnt == hip->first_blocks) { |
|
mutex_unlock(&fd.tree->tree_lock); |
|
hfsplus_free_extents(sb, hip->first_extents, |
|
alloc_cnt, alloc_cnt - blk_cnt); |
|
hfsplus_dump_extent(hip->first_extents); |
|
hip->first_blocks = blk_cnt; |
|
mutex_lock(&fd.tree->tree_lock); |
|
break; |
|
} |
|
res = __hfsplus_ext_cache_extent(&fd, inode, alloc_cnt); |
|
if (res) |
|
break; |
|
|
|
start = hip->cached_start; |
|
if (blk_cnt <= start) |
|
hfs_brec_remove(&fd); |
|
mutex_unlock(&fd.tree->tree_lock); |
|
hfsplus_free_extents(sb, hip->cached_extents, |
|
alloc_cnt - start, alloc_cnt - blk_cnt); |
|
hfsplus_dump_extent(hip->cached_extents); |
|
mutex_lock(&fd.tree->tree_lock); |
|
if (blk_cnt > start) { |
|
hip->extent_state |= HFSPLUS_EXT_DIRTY; |
|
break; |
|
} |
|
alloc_cnt = start; |
|
hip->cached_start = hip->cached_blocks = 0; |
|
hip->extent_state &= ~(HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW); |
|
} |
|
hfs_find_exit(&fd); |
|
|
|
hip->alloc_blocks = blk_cnt; |
|
out_unlock: |
|
mutex_unlock(&hip->extents_lock); |
|
hip->phys_size = inode->i_size; |
|
hip->fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> |
|
sb->s_blocksize_bits; |
|
inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); |
|
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY); |
|
}
|
|
|