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After an extent is removed from the extent tree, the corresponding bits are also cleared from the block allocation file. This is currently done without releasing the tree lock. The problem is that the allocation file has extents of its own; if it is fragmented enough, some of them may be in the extent tree as well, and hfsplus_get_block() will try to take the lock again. To avoid deadlock, only hold the extent tree lock during the actual tree operations. Link: http://lkml.kernel.org/r/20180709202549.auxwkb6memlegb4a@eaf Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com> Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com> Cc: Viacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
622 lines
15 KiB
C
622 lines
15 KiB
C
// 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 (flar@allandria.com)
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* (C) 2003 Ardis Technologies <roman@ardistech.com>
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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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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "hfsplus_fs.h"
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#include "hfsplus_raw.h"
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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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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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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 (iblock > hip->fs_blocks || !create)
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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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if (hip->alloc_blocks <= hip->first_blocks) {
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if (!hip->first_blocks) {
|
|
hfs_dbg(EXTENT, "first extents\n");
|
|
/* no extents yet */
|
|
hip->first_extents[0].start_block = cpu_to_be32(start);
|
|
hip->first_extents[0].block_count = cpu_to_be32(len);
|
|
res = 0;
|
|
} else {
|
|
/* try to append to extents in inode */
|
|
res = hfsplus_add_extent(hip->first_extents,
|
|
hip->alloc_blocks,
|
|
start, len);
|
|
if (res == -ENOSPC)
|
|
goto insert_extent;
|
|
}
|
|
if (!res) {
|
|
hfsplus_dump_extent(hip->first_extents);
|
|
hip->first_blocks += len;
|
|
}
|
|
} else {
|
|
res = hfsplus_add_extent(hip->cached_extents,
|
|
hip->alloc_blocks - hip->cached_start,
|
|
start, len);
|
|
if (!res) {
|
|
hfsplus_dump_extent(hip->cached_extents);
|
|
hip->extent_state |= HFSPLUS_EXT_DIRTY;
|
|
hip->cached_blocks += len;
|
|
} else if (res == -ENOSPC)
|
|
goto insert_extent;
|
|
}
|
|
out:
|
|
if (!res) {
|
|
hip->alloc_blocks += len;
|
|
mutex_unlock(&hip->extents_lock);
|
|
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ALLOC_DIRTY);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&hip->extents_lock);
|
|
return res;
|
|
|
|
insert_extent:
|
|
hfs_dbg(EXTENT, "insert new extent\n");
|
|
res = hfsplus_ext_write_extent_locked(inode);
|
|
if (res)
|
|
goto out;
|
|
|
|
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
|
|
hip->cached_extents[0].start_block = cpu_to_be32(start);
|
|
hip->cached_extents[0].block_count = cpu_to_be32(len);
|
|
hfsplus_dump_extent(hip->cached_extents);
|
|
hip->extent_state |= HFSPLUS_EXT_DIRTY | HFSPLUS_EXT_NEW;
|
|
hip->cached_start = hip->alloc_blocks;
|
|
hip->cached_blocks = len;
|
|
|
|
res = 0;
|
|
goto out;
|
|
}
|
|
|
|
void hfsplus_file_truncate(struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
|
|
struct hfs_find_data fd;
|
|
u32 alloc_cnt, blk_cnt, start;
|
|
int res;
|
|
|
|
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;
|
|
hfs_brec_remove(&fd);
|
|
|
|
mutex_unlock(&fd.tree->tree_lock);
|
|
start = hip->cached_start;
|
|
hfsplus_free_extents(sb, hip->cached_extents,
|
|
alloc_cnt - start, alloc_cnt - blk_cnt);
|
|
hfsplus_dump_extent(hip->cached_extents);
|
|
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);
|
|
mutex_lock(&fd.tree->tree_lock);
|
|
}
|
|
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);
|
|
}
|