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386 lines
8.7 KiB
386 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hfsplus/attributes.c |
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* |
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* Vyacheslav Dubeyko <[email protected]> |
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* |
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* Handling of records in attributes tree |
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*/ |
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#include "hfsplus_fs.h" |
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#include "hfsplus_raw.h" |
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static struct kmem_cache *hfsplus_attr_tree_cachep; |
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int __init hfsplus_create_attr_tree_cache(void) |
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{ |
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if (hfsplus_attr_tree_cachep) |
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return -EEXIST; |
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hfsplus_attr_tree_cachep = |
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kmem_cache_create("hfsplus_attr_cache", |
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sizeof(hfsplus_attr_entry), 0, |
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SLAB_HWCACHE_ALIGN, NULL); |
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if (!hfsplus_attr_tree_cachep) |
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return -ENOMEM; |
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return 0; |
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} |
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void hfsplus_destroy_attr_tree_cache(void) |
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{ |
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kmem_cache_destroy(hfsplus_attr_tree_cachep); |
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} |
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int hfsplus_attr_bin_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 k1_cnid, k2_cnid; |
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k1_cnid = k1->attr.cnid; |
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k2_cnid = k2->attr.cnid; |
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if (k1_cnid != k2_cnid) |
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return be32_to_cpu(k1_cnid) < be32_to_cpu(k2_cnid) ? -1 : 1; |
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return hfsplus_strcmp( |
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(const struct hfsplus_unistr *)&k1->attr.key_name, |
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(const struct hfsplus_unistr *)&k2->attr.key_name); |
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} |
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int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key, |
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u32 cnid, const char *name) |
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{ |
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int len; |
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memset(key, 0, sizeof(struct hfsplus_attr_key)); |
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key->attr.cnid = cpu_to_be32(cnid); |
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if (name) { |
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int res = hfsplus_asc2uni(sb, |
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(struct hfsplus_unistr *)&key->attr.key_name, |
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HFSPLUS_ATTR_MAX_STRLEN, name, strlen(name)); |
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if (res) |
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return res; |
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len = be16_to_cpu(key->attr.key_name.length); |
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} else { |
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key->attr.key_name.length = 0; |
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len = 0; |
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} |
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/* The length of the key, as stored in key_len field, does not include |
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* the size of the key_len field itself. |
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* So, offsetof(hfsplus_attr_key, key_name) is a trick because |
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* it takes into consideration key_len field (__be16) of |
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* hfsplus_attr_key structure instead of length field (__be16) of |
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* hfsplus_attr_unistr structure. |
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*/ |
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key->key_len = |
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cpu_to_be16(offsetof(struct hfsplus_attr_key, key_name) + |
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2 * len); |
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return 0; |
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} |
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hfsplus_attr_entry *hfsplus_alloc_attr_entry(void) |
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{ |
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return kmem_cache_alloc(hfsplus_attr_tree_cachep, GFP_KERNEL); |
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} |
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void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry) |
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{ |
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if (entry) |
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kmem_cache_free(hfsplus_attr_tree_cachep, entry); |
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} |
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#define HFSPLUS_INVALID_ATTR_RECORD -1 |
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static int hfsplus_attr_build_record(hfsplus_attr_entry *entry, int record_type, |
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u32 cnid, const void *value, size_t size) |
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{ |
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if (record_type == HFSPLUS_ATTR_FORK_DATA) { |
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/* |
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* Mac OS X supports only inline data attributes. |
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* Do nothing |
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*/ |
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memset(entry, 0, sizeof(*entry)); |
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return sizeof(struct hfsplus_attr_fork_data); |
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} else if (record_type == HFSPLUS_ATTR_EXTENTS) { |
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/* |
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* Mac OS X supports only inline data attributes. |
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* Do nothing. |
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*/ |
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memset(entry, 0, sizeof(*entry)); |
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return sizeof(struct hfsplus_attr_extents); |
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} else if (record_type == HFSPLUS_ATTR_INLINE_DATA) { |
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u16 len; |
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memset(entry, 0, sizeof(struct hfsplus_attr_inline_data)); |
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entry->inline_data.record_type = cpu_to_be32(record_type); |
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if (size <= HFSPLUS_MAX_INLINE_DATA_SIZE) |
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len = size; |
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else |
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return HFSPLUS_INVALID_ATTR_RECORD; |
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entry->inline_data.length = cpu_to_be16(len); |
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memcpy(entry->inline_data.raw_bytes, value, len); |
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/* |
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* Align len on two-byte boundary. |
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* It needs to add pad byte if we have odd len. |
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*/ |
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len = round_up(len, 2); |
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return offsetof(struct hfsplus_attr_inline_data, raw_bytes) + |
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len; |
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} else /* invalid input */ |
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memset(entry, 0, sizeof(*entry)); |
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return HFSPLUS_INVALID_ATTR_RECORD; |
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} |
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int hfsplus_find_attr(struct super_block *sb, u32 cnid, |
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const char *name, struct hfs_find_data *fd) |
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{ |
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int err = 0; |
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hfs_dbg(ATTR_MOD, "find_attr: %s,%d\n", name ? name : NULL, cnid); |
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if (!HFSPLUS_SB(sb)->attr_tree) { |
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pr_err("attributes file doesn't exist\n"); |
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return -EINVAL; |
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} |
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if (name) { |
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err = hfsplus_attr_build_key(sb, fd->search_key, cnid, name); |
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if (err) |
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goto failed_find_attr; |
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err = hfs_brec_find(fd, hfs_find_rec_by_key); |
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if (err) |
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goto failed_find_attr; |
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} else { |
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err = hfsplus_attr_build_key(sb, fd->search_key, cnid, NULL); |
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if (err) |
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goto failed_find_attr; |
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err = hfs_brec_find(fd, hfs_find_1st_rec_by_cnid); |
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if (err) |
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goto failed_find_attr; |
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} |
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failed_find_attr: |
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return err; |
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} |
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int hfsplus_attr_exists(struct inode *inode, const char *name) |
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{ |
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int err = 0; |
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struct super_block *sb = inode->i_sb; |
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struct hfs_find_data fd; |
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if (!HFSPLUS_SB(sb)->attr_tree) |
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return 0; |
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err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
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if (err) |
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return 0; |
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err = hfsplus_find_attr(sb, inode->i_ino, name, &fd); |
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if (err) |
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goto attr_not_found; |
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hfs_find_exit(&fd); |
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return 1; |
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attr_not_found: |
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hfs_find_exit(&fd); |
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return 0; |
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} |
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int hfsplus_create_attr(struct inode *inode, |
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const char *name, |
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const void *value, size_t size) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct hfs_find_data fd; |
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hfsplus_attr_entry *entry_ptr; |
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int entry_size; |
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int err; |
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hfs_dbg(ATTR_MOD, "create_attr: %s,%ld\n", |
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name ? name : NULL, inode->i_ino); |
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if (!HFSPLUS_SB(sb)->attr_tree) { |
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pr_err("attributes file doesn't exist\n"); |
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return -EINVAL; |
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} |
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entry_ptr = hfsplus_alloc_attr_entry(); |
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if (!entry_ptr) |
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return -ENOMEM; |
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err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
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if (err) |
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goto failed_init_create_attr; |
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/* Fail early and avoid ENOSPC during the btree operation */ |
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err = hfs_bmap_reserve(fd.tree, fd.tree->depth + 1); |
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if (err) |
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goto failed_create_attr; |
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if (name) { |
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err = hfsplus_attr_build_key(sb, fd.search_key, |
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inode->i_ino, name); |
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if (err) |
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goto failed_create_attr; |
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} else { |
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err = -EINVAL; |
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goto failed_create_attr; |
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} |
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/* Mac OS X supports only inline data attributes. */ |
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entry_size = hfsplus_attr_build_record(entry_ptr, |
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HFSPLUS_ATTR_INLINE_DATA, |
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inode->i_ino, |
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value, size); |
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if (entry_size == HFSPLUS_INVALID_ATTR_RECORD) { |
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err = -EINVAL; |
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goto failed_create_attr; |
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} |
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err = hfs_brec_find(&fd, hfs_find_rec_by_key); |
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if (err != -ENOENT) { |
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if (!err) |
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err = -EEXIST; |
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goto failed_create_attr; |
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} |
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err = hfs_brec_insert(&fd, entry_ptr, entry_size); |
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if (err) |
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goto failed_create_attr; |
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hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY); |
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failed_create_attr: |
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hfs_find_exit(&fd); |
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failed_init_create_attr: |
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hfsplus_destroy_attr_entry(entry_ptr); |
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return err; |
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} |
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static int __hfsplus_delete_attr(struct inode *inode, u32 cnid, |
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struct hfs_find_data *fd) |
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{ |
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int err = 0; |
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__be32 found_cnid, record_type; |
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hfs_bnode_read(fd->bnode, &found_cnid, |
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fd->keyoffset + |
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offsetof(struct hfsplus_attr_key, cnid), |
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sizeof(__be32)); |
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if (cnid != be32_to_cpu(found_cnid)) |
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return -ENOENT; |
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hfs_bnode_read(fd->bnode, &record_type, |
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fd->entryoffset, sizeof(record_type)); |
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switch (be32_to_cpu(record_type)) { |
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case HFSPLUS_ATTR_INLINE_DATA: |
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/* All is OK. Do nothing. */ |
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break; |
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case HFSPLUS_ATTR_FORK_DATA: |
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case HFSPLUS_ATTR_EXTENTS: |
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pr_err("only inline data xattr are supported\n"); |
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return -EOPNOTSUPP; |
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default: |
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pr_err("invalid extended attribute record\n"); |
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return -ENOENT; |
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} |
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/* Avoid btree corruption */ |
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hfs_bnode_read(fd->bnode, fd->search_key, |
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fd->keyoffset, fd->keylength); |
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err = hfs_brec_remove(fd); |
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if (err) |
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return err; |
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hfsplus_mark_inode_dirty(inode, HFSPLUS_I_ATTR_DIRTY); |
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return err; |
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} |
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int hfsplus_delete_attr(struct inode *inode, const char *name) |
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{ |
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int err = 0; |
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struct super_block *sb = inode->i_sb; |
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struct hfs_find_data fd; |
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hfs_dbg(ATTR_MOD, "delete_attr: %s,%ld\n", |
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name ? name : NULL, inode->i_ino); |
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if (!HFSPLUS_SB(sb)->attr_tree) { |
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pr_err("attributes file doesn't exist\n"); |
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return -EINVAL; |
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} |
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err = hfs_find_init(HFSPLUS_SB(sb)->attr_tree, &fd); |
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if (err) |
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return err; |
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/* Fail early and avoid ENOSPC during the btree operation */ |
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err = hfs_bmap_reserve(fd.tree, fd.tree->depth); |
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if (err) |
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goto out; |
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if (name) { |
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err = hfsplus_attr_build_key(sb, fd.search_key, |
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inode->i_ino, name); |
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if (err) |
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goto out; |
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} else { |
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pr_err("invalid extended attribute name\n"); |
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err = -EINVAL; |
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goto out; |
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} |
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err = hfs_brec_find(&fd, hfs_find_rec_by_key); |
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if (err) |
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goto out; |
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err = __hfsplus_delete_attr(inode, inode->i_ino, &fd); |
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if (err) |
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goto out; |
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out: |
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hfs_find_exit(&fd); |
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return err; |
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} |
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int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid) |
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{ |
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int err = 0; |
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struct hfs_find_data fd; |
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hfs_dbg(ATTR_MOD, "delete_all_attrs: %d\n", cnid); |
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if (!HFSPLUS_SB(dir->i_sb)->attr_tree) { |
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pr_err("attributes file doesn't exist\n"); |
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return -EINVAL; |
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} |
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err = hfs_find_init(HFSPLUS_SB(dir->i_sb)->attr_tree, &fd); |
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if (err) |
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return err; |
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for (;;) { |
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err = hfsplus_find_attr(dir->i_sb, cnid, NULL, &fd); |
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if (err) { |
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if (err != -ENOENT) |
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pr_err("xattr search failed\n"); |
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goto end_delete_all; |
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} |
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err = __hfsplus_delete_attr(dir, cnid, &fd); |
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if (err) |
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goto end_delete_all; |
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} |
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end_delete_all: |
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hfs_find_exit(&fd); |
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return err; |
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}
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