| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * linux/fs/ext4/xattr.c |
| * |
| * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
| * |
| * Fix by Harrison Xing <harrison@mountainviewdata.com>. |
| * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. |
| * Extended attributes for symlinks and special files added per |
| * suggestion of Luka Renko <luka.renko@hermes.si>. |
| * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, |
| * Red Hat Inc. |
| * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz |
| * and Andreas Gruenbacher <agruen@suse.de>. |
| */ |
| |
| /* |
| * Extended attributes are stored directly in inodes (on file systems with |
| * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl |
| * field contains the block number if an inode uses an additional block. All |
| * attributes must fit in the inode and one additional block. Blocks that |
| * contain the identical set of attributes may be shared among several inodes. |
| * Identical blocks are detected by keeping a cache of blocks that have |
| * recently been accessed. |
| * |
| * The attributes in inodes and on blocks have a different header; the entries |
| * are stored in the same format: |
| * |
| * +------------------+ |
| * | header | |
| * | entry 1 | | |
| * | entry 2 | | growing downwards |
| * | entry 3 | v |
| * | four null bytes | |
| * | . . . | |
| * | value 1 | ^ |
| * | value 3 | | growing upwards |
| * | value 2 | | |
| * +------------------+ |
| * |
| * The header is followed by multiple entry descriptors. In disk blocks, the |
| * entry descriptors are kept sorted. In inodes, they are unsorted. The |
| * attribute values are aligned to the end of the block in no specific order. |
| * |
| * Locking strategy |
| * ---------------- |
| * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. |
| * EA blocks are only changed if they are exclusive to an inode, so |
| * holding xattr_sem also means that nothing but the EA block's reference |
| * count can change. Multiple writers to the same block are synchronized |
| * by the buffer lock. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/mbcache.h> |
| #include <linux/quotaops.h> |
| #include <linux/iversion.h> |
| #include "ext4_jbd2.h" |
| #include "ext4.h" |
| #include "xattr.h" |
| #include "acl.h" |
| |
| #ifdef EXT4_XATTR_DEBUG |
| # define ea_idebug(inode, fmt, ...) \ |
| printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ |
| inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) |
| # define ea_bdebug(bh, fmt, ...) \ |
| printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ |
| bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) |
| #else |
| # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) |
| #endif |
| |
| static void ext4_xattr_block_cache_insert(struct mb_cache *, |
| struct buffer_head *); |
| static struct buffer_head * |
| ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, |
| struct mb_cache_entry **); |
| static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, |
| size_t value_count); |
| static void ext4_xattr_rehash(struct ext4_xattr_header *); |
| |
| static const struct xattr_handler * const ext4_xattr_handler_map[] = { |
| [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, |
| [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, |
| #endif |
| [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, |
| #ifdef CONFIG_EXT4_FS_SECURITY |
| [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, |
| #endif |
| }; |
| |
| const struct xattr_handler *ext4_xattr_handlers[] = { |
| &ext4_xattr_user_handler, |
| &ext4_xattr_trusted_handler, |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| &posix_acl_access_xattr_handler, |
| &posix_acl_default_xattr_handler, |
| #endif |
| #ifdef CONFIG_EXT4_FS_SECURITY |
| &ext4_xattr_security_handler, |
| #endif |
| NULL |
| }; |
| |
| #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ |
| inode->i_sb->s_fs_info)->s_ea_block_cache) |
| |
| #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ |
| inode->i_sb->s_fs_info)->s_ea_inode_cache) |
| |
| static int |
| ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
| struct inode *inode); |
| |
| #ifdef CONFIG_LOCKDEP |
| void ext4_xattr_inode_set_class(struct inode *ea_inode) |
| { |
| lockdep_set_subclass(&ea_inode->i_rwsem, 1); |
| } |
| #endif |
| |
| static __le32 ext4_xattr_block_csum(struct inode *inode, |
| sector_t block_nr, |
| struct ext4_xattr_header *hdr) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| __u32 csum; |
| __le64 dsk_block_nr = cpu_to_le64(block_nr); |
| __u32 dummy_csum = 0; |
| int offset = offsetof(struct ext4_xattr_header, h_checksum); |
| |
| csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, |
| sizeof(dsk_block_nr)); |
| csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); |
| csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); |
| offset += sizeof(dummy_csum); |
| csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, |
| EXT4_BLOCK_SIZE(inode->i_sb) - offset); |
| |
| return cpu_to_le32(csum); |
| } |
| |
| static int ext4_xattr_block_csum_verify(struct inode *inode, |
| struct buffer_head *bh) |
| { |
| struct ext4_xattr_header *hdr = BHDR(bh); |
| int ret = 1; |
| |
| if (ext4_has_metadata_csum(inode->i_sb)) { |
| lock_buffer(bh); |
| ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, |
| bh->b_blocknr, hdr)); |
| unlock_buffer(bh); |
| } |
| return ret; |
| } |
| |
| static void ext4_xattr_block_csum_set(struct inode *inode, |
| struct buffer_head *bh) |
| { |
| if (ext4_has_metadata_csum(inode->i_sb)) |
| BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, |
| bh->b_blocknr, BHDR(bh)); |
| } |
| |
| static inline const struct xattr_handler * |
| ext4_xattr_handler(int name_index) |
| { |
| const struct xattr_handler *handler = NULL; |
| |
| if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) |
| handler = ext4_xattr_handler_map[name_index]; |
| return handler; |
| } |
| |
| static int |
| ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end, |
| void *value_start) |
| { |
| struct ext4_xattr_entry *e = entry; |
| |
| /* Find the end of the names list */ |
| while (!IS_LAST_ENTRY(e)) { |
| struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); |
| if ((void *)next >= end) |
| return -EFSCORRUPTED; |
| if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) |
| return -EFSCORRUPTED; |
| e = next; |
| } |
| |
| /* Check the values */ |
| while (!IS_LAST_ENTRY(entry)) { |
| u32 size = le32_to_cpu(entry->e_value_size); |
| |
| if (size > EXT4_XATTR_SIZE_MAX) |
| return -EFSCORRUPTED; |
| |
| if (size != 0 && entry->e_value_inum == 0) { |
| u16 offs = le16_to_cpu(entry->e_value_offs); |
| void *value; |
| |
| /* |
| * The value cannot overlap the names, and the value |
| * with padding cannot extend beyond 'end'. Check both |
| * the padded and unpadded sizes, since the size may |
| * overflow to 0 when adding padding. |
| */ |
| if (offs > end - value_start) |
| return -EFSCORRUPTED; |
| value = value_start + offs; |
| if (value < (void *)e + sizeof(u32) || |
| size > end - value || |
| EXT4_XATTR_SIZE(size) > end - value) |
| return -EFSCORRUPTED; |
| } |
| entry = EXT4_XATTR_NEXT(entry); |
| } |
| |
| return 0; |
| } |
| |
| static inline int |
| __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, |
| const char *function, unsigned int line) |
| { |
| int error = -EFSCORRUPTED; |
| |
| if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || |
| BHDR(bh)->h_blocks != cpu_to_le32(1)) |
| goto errout; |
| if (buffer_verified(bh)) |
| return 0; |
| |
| error = -EFSBADCRC; |
| if (!ext4_xattr_block_csum_verify(inode, bh)) |
| goto errout; |
| error = ext4_xattr_check_entries(BFIRST(bh), bh->b_data + bh->b_size, |
| bh->b_data); |
| errout: |
| if (error) |
| __ext4_error_inode(inode, function, line, 0, |
| "corrupted xattr block %llu", |
| (unsigned long long) bh->b_blocknr); |
| else |
| set_buffer_verified(bh); |
| return error; |
| } |
| |
| #define ext4_xattr_check_block(inode, bh) \ |
| __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) |
| |
| |
| static int |
| __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, |
| void *end, const char *function, unsigned int line) |
| { |
| int error = -EFSCORRUPTED; |
| |
| if (end - (void *)header < sizeof(*header) + sizeof(u32) || |
| (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC))) |
| goto errout; |
| error = ext4_xattr_check_entries(IFIRST(header), end, IFIRST(header)); |
| errout: |
| if (error) |
| __ext4_error_inode(inode, function, line, 0, |
| "corrupted in-inode xattr"); |
| return error; |
| } |
| |
| #define xattr_check_inode(inode, header, end) \ |
| __xattr_check_inode((inode), (header), (end), __func__, __LINE__) |
| |
| static int |
| xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, |
| void *end, int name_index, const char *name, int sorted) |
| { |
| struct ext4_xattr_entry *entry, *next; |
| size_t name_len; |
| int cmp = 1; |
| |
| if (name == NULL) |
| return -EINVAL; |
| name_len = strlen(name); |
| for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { |
| next = EXT4_XATTR_NEXT(entry); |
| if ((void *) next >= end) { |
| EXT4_ERROR_INODE(inode, "corrupted xattr entries"); |
| return -EFSCORRUPTED; |
| } |
| cmp = name_index - entry->e_name_index; |
| if (!cmp) |
| cmp = name_len - entry->e_name_len; |
| if (!cmp) |
| cmp = memcmp(name, entry->e_name, name_len); |
| if (cmp <= 0 && (sorted || cmp == 0)) |
| break; |
| } |
| *pentry = entry; |
| return cmp ? -ENODATA : 0; |
| } |
| |
| static u32 |
| ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) |
| { |
| return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); |
| } |
| |
| static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) |
| { |
| return ((u64)ea_inode->i_ctime.tv_sec << 32) | |
| (u32) inode_peek_iversion_raw(ea_inode); |
| } |
| |
| static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) |
| { |
| ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); |
| inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); |
| } |
| |
| static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) |
| { |
| return (u32)ea_inode->i_atime.tv_sec; |
| } |
| |
| static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) |
| { |
| ea_inode->i_atime.tv_sec = hash; |
| } |
| |
| /* |
| * Read the EA value from an inode. |
| */ |
| static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) |
| { |
| int blocksize = 1 << ea_inode->i_blkbits; |
| int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; |
| int tail_size = (size % blocksize) ?: blocksize; |
| struct buffer_head *bhs_inline[8]; |
| struct buffer_head **bhs = bhs_inline; |
| int i, ret; |
| |
| if (bh_count > ARRAY_SIZE(bhs_inline)) { |
| bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); |
| if (!bhs) |
| return -ENOMEM; |
| } |
| |
| ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, |
| true /* wait */, bhs); |
| if (ret) |
| goto free_bhs; |
| |
| for (i = 0; i < bh_count; i++) { |
| /* There shouldn't be any holes in ea_inode. */ |
| if (!bhs[i]) { |
| ret = -EFSCORRUPTED; |
| goto put_bhs; |
| } |
| memcpy((char *)buf + blocksize * i, bhs[i]->b_data, |
| i < bh_count - 1 ? blocksize : tail_size); |
| } |
| ret = 0; |
| put_bhs: |
| for (i = 0; i < bh_count; i++) |
| brelse(bhs[i]); |
| free_bhs: |
| if (bhs != bhs_inline) |
| kfree(bhs); |
| return ret; |
| } |
| |
| #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) |
| |
| static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, |
| u32 ea_inode_hash, struct inode **ea_inode) |
| { |
| struct inode *inode; |
| int err; |
| |
| inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| ext4_error(parent->i_sb, |
| "error while reading EA inode %lu err=%d", ea_ino, |
| err); |
| return err; |
| } |
| |
| if (is_bad_inode(inode)) { |
| ext4_error(parent->i_sb, |
| "error while reading EA inode %lu is_bad_inode", |
| ea_ino); |
| err = -EIO; |
| goto error; |
| } |
| |
| if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { |
| ext4_error(parent->i_sb, |
| "EA inode %lu does not have EXT4_EA_INODE_FL flag", |
| ea_ino); |
| err = -EINVAL; |
| goto error; |
| } |
| |
| ext4_xattr_inode_set_class(inode); |
| |
| /* |
| * Check whether this is an old Lustre-style xattr inode. Lustre |
| * implementation does not have hash validation, rather it has a |
| * backpointer from ea_inode to the parent inode. |
| */ |
| if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && |
| EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && |
| inode->i_generation == parent->i_generation) { |
| ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); |
| ext4_xattr_inode_set_ref(inode, 1); |
| } else { |
| inode_lock(inode); |
| inode->i_flags |= S_NOQUOTA; |
| inode_unlock(inode); |
| } |
| |
| *ea_inode = inode; |
| return 0; |
| error: |
| iput(inode); |
| return err; |
| } |
| |
| static int |
| ext4_xattr_inode_verify_hashes(struct inode *ea_inode, |
| struct ext4_xattr_entry *entry, void *buffer, |
| size_t size) |
| { |
| u32 hash; |
| |
| /* Verify stored hash matches calculated hash. */ |
| hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); |
| if (hash != ext4_xattr_inode_get_hash(ea_inode)) |
| return -EFSCORRUPTED; |
| |
| if (entry) { |
| __le32 e_hash, tmp_data; |
| |
| /* Verify entry hash. */ |
| tmp_data = cpu_to_le32(hash); |
| e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, |
| &tmp_data, 1); |
| if (e_hash != entry->e_hash) |
| return -EFSCORRUPTED; |
| } |
| return 0; |
| } |
| |
| /* |
| * Read xattr value from the EA inode. |
| */ |
| static int |
| ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, |
| void *buffer, size_t size) |
| { |
| struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
| struct inode *ea_inode; |
| int err; |
| |
| err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), |
| le32_to_cpu(entry->e_hash), &ea_inode); |
| if (err) { |
| ea_inode = NULL; |
| goto out; |
| } |
| |
| if (i_size_read(ea_inode) != size) { |
| ext4_warning_inode(ea_inode, |
| "ea_inode file size=%llu entry size=%zu", |
| i_size_read(ea_inode), size); |
| err = -EFSCORRUPTED; |
| goto out; |
| } |
| |
| err = ext4_xattr_inode_read(ea_inode, buffer, size); |
| if (err) |
| goto out; |
| |
| if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { |
| err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, |
| size); |
| if (err) { |
| ext4_warning_inode(ea_inode, |
| "EA inode hash validation failed"); |
| goto out; |
| } |
| |
| if (ea_inode_cache) |
| mb_cache_entry_create(ea_inode_cache, GFP_NOFS, |
| ext4_xattr_inode_get_hash(ea_inode), |
| ea_inode->i_ino, true /* reusable */); |
| } |
| out: |
| iput(ea_inode); |
| return err; |
| } |
| |
| static int |
| ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, |
| void *buffer, size_t buffer_size) |
| { |
| struct buffer_head *bh = NULL; |
| struct ext4_xattr_entry *entry; |
| size_t size; |
| void *end; |
| int error; |
| struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
| |
| ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", |
| name_index, name, buffer, (long)buffer_size); |
| |
| if (!EXT4_I(inode)->i_file_acl) |
| return -ENODATA; |
| ea_idebug(inode, "reading block %llu", |
| (unsigned long long)EXT4_I(inode)->i_file_acl); |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) |
| return PTR_ERR(bh); |
| ea_bdebug(bh, "b_count=%d, refcount=%d", |
| atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); |
| error = ext4_xattr_check_block(inode, bh); |
| if (error) |
| goto cleanup; |
| ext4_xattr_block_cache_insert(ea_block_cache, bh); |
| entry = BFIRST(bh); |
| end = bh->b_data + bh->b_size; |
| error = xattr_find_entry(inode, &entry, end, name_index, name, 1); |
| if (error) |
| goto cleanup; |
| size = le32_to_cpu(entry->e_value_size); |
| error = -ERANGE; |
| if (unlikely(size > EXT4_XATTR_SIZE_MAX)) |
| goto cleanup; |
| if (buffer) { |
| if (size > buffer_size) |
| goto cleanup; |
| if (entry->e_value_inum) { |
| error = ext4_xattr_inode_get(inode, entry, buffer, |
| size); |
| if (error) |
| goto cleanup; |
| } else { |
| u16 offset = le16_to_cpu(entry->e_value_offs); |
| void *p = bh->b_data + offset; |
| |
| if (unlikely(p + size > end)) |
| goto cleanup; |
| memcpy(buffer, p, size); |
| } |
| } |
| error = size; |
| |
| cleanup: |
| brelse(bh); |
| return error; |
| } |
| |
| int |
| ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, |
| void *buffer, size_t buffer_size) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_xattr_entry *entry; |
| struct ext4_inode *raw_inode; |
| struct ext4_iloc iloc; |
| size_t size; |
| void *end; |
| int error; |
| |
| if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
| return -ENODATA; |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) |
| return error; |
| raw_inode = ext4_raw_inode(&iloc); |
| header = IHDR(inode, raw_inode); |
| end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| error = xattr_check_inode(inode, header, end); |
| if (error) |
| goto cleanup; |
| entry = IFIRST(header); |
| error = xattr_find_entry(inode, &entry, end, name_index, name, 0); |
| if (error) |
| goto cleanup; |
| size = le32_to_cpu(entry->e_value_size); |
| error = -ERANGE; |
| if (unlikely(size > EXT4_XATTR_SIZE_MAX)) |
| goto cleanup; |
| if (buffer) { |
| if (size > buffer_size) |
| goto cleanup; |
| if (entry->e_value_inum) { |
| error = ext4_xattr_inode_get(inode, entry, buffer, |
| size); |
| if (error) |
| goto cleanup; |
| } else { |
| u16 offset = le16_to_cpu(entry->e_value_offs); |
| void *p = (void *)IFIRST(header) + offset; |
| |
| if (unlikely(p + size > end)) |
| goto cleanup; |
| memcpy(buffer, p, size); |
| } |
| } |
| error = size; |
| |
| cleanup: |
| brelse(iloc.bh); |
| return error; |
| } |
| |
| /* |
| * ext4_xattr_get() |
| * |
| * Copy an extended attribute into the buffer |
| * provided, or compute the buffer size required. |
| * Buffer is NULL to compute the size of the buffer required. |
| * |
| * Returns a negative error number on failure, or the number of bytes |
| * used / required on success. |
| */ |
| int |
| ext4_xattr_get(struct inode *inode, int name_index, const char *name, |
| void *buffer, size_t buffer_size) |
| { |
| int error; |
| |
| if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
| return -EIO; |
| |
| if (strlen(name) > 255) |
| return -ERANGE; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| error = ext4_xattr_ibody_get(inode, name_index, name, buffer, |
| buffer_size); |
| if (error == -ENODATA) |
| error = ext4_xattr_block_get(inode, name_index, name, buffer, |
| buffer_size); |
| up_read(&EXT4_I(inode)->xattr_sem); |
| return error; |
| } |
| |
| static int |
| ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, |
| char *buffer, size_t buffer_size) |
| { |
| size_t rest = buffer_size; |
| |
| for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
| const struct xattr_handler *handler = |
| ext4_xattr_handler(entry->e_name_index); |
| |
| if (handler && (!handler->list || handler->list(dentry))) { |
| const char *prefix = handler->prefix ?: handler->name; |
| size_t prefix_len = strlen(prefix); |
| size_t size = prefix_len + entry->e_name_len + 1; |
| |
| if (buffer) { |
| if (size > rest) |
| return -ERANGE; |
| memcpy(buffer, prefix, prefix_len); |
| buffer += prefix_len; |
| memcpy(buffer, entry->e_name, entry->e_name_len); |
| buffer += entry->e_name_len; |
| *buffer++ = 0; |
| } |
| rest -= size; |
| } |
| } |
| return buffer_size - rest; /* total size */ |
| } |
| |
| static int |
| ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
| { |
| struct inode *inode = d_inode(dentry); |
| struct buffer_head *bh = NULL; |
| int error; |
| |
| ea_idebug(inode, "buffer=%p, buffer_size=%ld", |
| buffer, (long)buffer_size); |
| |
| if (!EXT4_I(inode)->i_file_acl) |
| return 0; |
| ea_idebug(inode, "reading block %llu", |
| (unsigned long long)EXT4_I(inode)->i_file_acl); |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) |
| return PTR_ERR(bh); |
| ea_bdebug(bh, "b_count=%d, refcount=%d", |
| atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); |
| error = ext4_xattr_check_block(inode, bh); |
| if (error) |
| goto cleanup; |
| ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); |
| error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, |
| buffer_size); |
| cleanup: |
| brelse(bh); |
| return error; |
| } |
| |
| static int |
| ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) |
| { |
| struct inode *inode = d_inode(dentry); |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_inode *raw_inode; |
| struct ext4_iloc iloc; |
| void *end; |
| int error; |
| |
| if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
| return 0; |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) |
| return error; |
| raw_inode = ext4_raw_inode(&iloc); |
| header = IHDR(inode, raw_inode); |
| end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| error = xattr_check_inode(inode, header, end); |
| if (error) |
| goto cleanup; |
| error = ext4_xattr_list_entries(dentry, IFIRST(header), |
| buffer, buffer_size); |
| |
| cleanup: |
| brelse(iloc.bh); |
| return error; |
| } |
| |
| /* |
| * Inode operation listxattr() |
| * |
| * d_inode(dentry)->i_rwsem: don't care |
| * |
| * Copy a list of attribute names into the buffer |
| * provided, or compute the buffer size required. |
| * Buffer is NULL to compute the size of the buffer required. |
| * |
| * Returns a negative error number on failure, or the number of bytes |
| * used / required on success. |
| */ |
| ssize_t |
| ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) |
| { |
| int ret, ret2; |
| |
| down_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
| ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); |
| if (ret < 0) |
| goto errout; |
| if (buffer) { |
| buffer += ret; |
| buffer_size -= ret; |
| } |
| ret = ext4_xattr_block_list(dentry, buffer, buffer_size); |
| if (ret < 0) |
| goto errout; |
| ret += ret2; |
| errout: |
| up_read(&EXT4_I(d_inode(dentry))->xattr_sem); |
| return ret; |
| } |
| |
| /* |
| * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is |
| * not set, set it. |
| */ |
| static void ext4_xattr_update_super_block(handle_t *handle, |
| struct super_block *sb) |
| { |
| if (ext4_has_feature_xattr(sb)) |
| return; |
| |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); |
| if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) { |
| ext4_set_feature_xattr(sb); |
| ext4_handle_dirty_super(handle, sb); |
| } |
| } |
| |
| int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) |
| { |
| struct ext4_iloc iloc = { .bh = NULL }; |
| struct buffer_head *bh = NULL; |
| struct ext4_inode *raw_inode; |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_xattr_entry *entry; |
| qsize_t ea_inode_refs = 0; |
| void *end; |
| int ret; |
| |
| lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); |
| |
| if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
| ret = ext4_get_inode_loc(inode, &iloc); |
| if (ret) |
| goto out; |
| raw_inode = ext4_raw_inode(&iloc); |
| header = IHDR(inode, raw_inode); |
| end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| ret = xattr_check_inode(inode, header, end); |
| if (ret) |
| goto out; |
| |
| for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); |
| entry = EXT4_XATTR_NEXT(entry)) |
| if (entry->e_value_inum) |
| ea_inode_refs++; |
| } |
| |
| if (EXT4_I(inode)->i_file_acl) { |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) { |
| ret = PTR_ERR(bh); |
| bh = NULL; |
| goto out; |
| } |
| |
| ret = ext4_xattr_check_block(inode, bh); |
| if (ret) |
| goto out; |
| |
| for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); |
| entry = EXT4_XATTR_NEXT(entry)) |
| if (entry->e_value_inum) |
| ea_inode_refs++; |
| } |
| *usage = ea_inode_refs + 1; |
| ret = 0; |
| out: |
| brelse(iloc.bh); |
| brelse(bh); |
| return ret; |
| } |
| |
| static inline size_t round_up_cluster(struct inode *inode, size_t length) |
| { |
| struct super_block *sb = inode->i_sb; |
| size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + |
| inode->i_blkbits); |
| size_t mask = ~(cluster_size - 1); |
| |
| return (length + cluster_size - 1) & mask; |
| } |
| |
| static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) |
| { |
| int err; |
| |
| err = dquot_alloc_inode(inode); |
| if (err) |
| return err; |
| err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); |
| if (err) |
| dquot_free_inode(inode); |
| return err; |
| } |
| |
| static void ext4_xattr_inode_free_quota(struct inode *parent, |
| struct inode *ea_inode, |
| size_t len) |
| { |
| if (ea_inode && |
| ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) |
| return; |
| dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); |
| dquot_free_inode(parent); |
| } |
| |
| int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, |
| struct buffer_head *block_bh, size_t value_len, |
| bool is_create) |
| { |
| int credits; |
| int blocks; |
| |
| /* |
| * 1) Owner inode update |
| * 2) Ref count update on old xattr block |
| * 3) new xattr block |
| * 4) block bitmap update for new xattr block |
| * 5) group descriptor for new xattr block |
| * 6) block bitmap update for old xattr block |
| * 7) group descriptor for old block |
| * |
| * 6 & 7 can happen if we have two racing threads T_a and T_b |
| * which are each trying to set an xattr on inodes I_a and I_b |
| * which were both initially sharing an xattr block. |
| */ |
| credits = 7; |
| |
| /* Quota updates. */ |
| credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); |
| |
| /* |
| * In case of inline data, we may push out the data to a block, |
| * so we need to reserve credits for this eventuality |
| */ |
| if (inode && ext4_has_inline_data(inode)) |
| credits += ext4_writepage_trans_blocks(inode) + 1; |
| |
| /* We are done if ea_inode feature is not enabled. */ |
| if (!ext4_has_feature_ea_inode(sb)) |
| return credits; |
| |
| /* New ea_inode, inode map, block bitmap, group descriptor. */ |
| credits += 4; |
| |
| /* Data blocks. */ |
| blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; |
| |
| /* Indirection block or one level of extent tree. */ |
| blocks += 1; |
| |
| /* Block bitmap and group descriptor updates for each block. */ |
| credits += blocks * 2; |
| |
| /* Blocks themselves. */ |
| credits += blocks; |
| |
| if (!is_create) { |
| /* Dereference ea_inode holding old xattr value. |
| * Old ea_inode, inode map, block bitmap, group descriptor. |
| */ |
| credits += 4; |
| |
| /* Data blocks for old ea_inode. */ |
| blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; |
| |
| /* Indirection block or one level of extent tree for old |
| * ea_inode. |
| */ |
| blocks += 1; |
| |
| /* Block bitmap and group descriptor updates for each block. */ |
| credits += blocks * 2; |
| } |
| |
| /* We may need to clone the existing xattr block in which case we need |
| * to increment ref counts for existing ea_inodes referenced by it. |
| */ |
| if (block_bh) { |
| struct ext4_xattr_entry *entry = BFIRST(block_bh); |
| |
| for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) |
| if (entry->e_value_inum) |
| /* Ref count update on ea_inode. */ |
| credits += 1; |
| } |
| return credits; |
| } |
| |
| static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode, |
| int credits, struct buffer_head *bh, |
| bool dirty, bool block_csum) |
| { |
| int error; |
| |
| if (!ext4_handle_valid(handle)) |
| return 0; |
| |
| if (handle->h_buffer_credits >= credits) |
| return 0; |
| |
| error = ext4_journal_extend(handle, credits - handle->h_buffer_credits); |
| if (!error) |
| return 0; |
| if (error < 0) { |
| ext4_warning(inode->i_sb, "Extend journal (error %d)", error); |
| return error; |
| } |
| |
| if (bh && dirty) { |
| if (block_csum) |
| ext4_xattr_block_csum_set(inode, bh); |
| error = ext4_handle_dirty_metadata(handle, NULL, bh); |
| if (error) { |
| ext4_warning(inode->i_sb, "Handle metadata (error %d)", |
| error); |
| return error; |
| } |
| } |
| |
| error = ext4_journal_restart(handle, credits); |
| if (error) { |
| ext4_warning(inode->i_sb, "Restart journal (error %d)", error); |
| return error; |
| } |
| |
| if (bh) { |
| error = ext4_journal_get_write_access(handle, bh); |
| if (error) { |
| ext4_warning(inode->i_sb, |
| "Get write access failed (error %d)", |
| error); |
| return error; |
| } |
| } |
| return 0; |
| } |
| |
| static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, |
| int ref_change) |
| { |
| struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode); |
| struct ext4_iloc iloc; |
| s64 ref_count; |
| u32 hash; |
| int ret; |
| |
| inode_lock(ea_inode); |
| |
| ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); |
| if (ret) |
| goto out; |
| |
| ref_count = ext4_xattr_inode_get_ref(ea_inode); |
| ref_count += ref_change; |
| ext4_xattr_inode_set_ref(ea_inode, ref_count); |
| |
| if (ref_change > 0) { |
| WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", |
| ea_inode->i_ino, ref_count); |
| |
| if (ref_count == 1) { |
| WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", |
| ea_inode->i_ino, ea_inode->i_nlink); |
| |
| set_nlink(ea_inode, 1); |
| ext4_orphan_del(handle, ea_inode); |
| |
| if (ea_inode_cache) { |
| hash = ext4_xattr_inode_get_hash(ea_inode); |
| mb_cache_entry_create(ea_inode_cache, |
| GFP_NOFS, hash, |
| ea_inode->i_ino, |
| true /* reusable */); |
| } |
| } |
| } else { |
| WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", |
| ea_inode->i_ino, ref_count); |
| |
| if (ref_count == 0) { |
| WARN_ONCE(ea_inode->i_nlink != 1, |
| "EA inode %lu i_nlink=%u", |
| ea_inode->i_ino, ea_inode->i_nlink); |
| |
| clear_nlink(ea_inode); |
| ext4_orphan_add(handle, ea_inode); |
| |
| if (ea_inode_cache) { |
| hash = ext4_xattr_inode_get_hash(ea_inode); |
| mb_cache_entry_delete(ea_inode_cache, hash, |
| ea_inode->i_ino); |
| } |
| } |
| } |
| |
| ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); |
| if (ret) |
| ext4_warning_inode(ea_inode, |
| "ext4_mark_iloc_dirty() failed ret=%d", ret); |
| out: |
| inode_unlock(ea_inode); |
| return ret; |
| } |
| |
| static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) |
| { |
| return ext4_xattr_inode_update_ref(handle, ea_inode, 1); |
| } |
| |
| static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) |
| { |
| return ext4_xattr_inode_update_ref(handle, ea_inode, -1); |
| } |
| |
| static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, |
| struct ext4_xattr_entry *first) |
| { |
| struct inode *ea_inode; |
| struct ext4_xattr_entry *entry; |
| struct ext4_xattr_entry *failed_entry; |
| unsigned int ea_ino; |
| int err, saved_err; |
| |
| for (entry = first; !IS_LAST_ENTRY(entry); |
| entry = EXT4_XATTR_NEXT(entry)) { |
| if (!entry->e_value_inum) |
| continue; |
| ea_ino = le32_to_cpu(entry->e_value_inum); |
| err = ext4_xattr_inode_iget(parent, ea_ino, |
| le32_to_cpu(entry->e_hash), |
| &ea_inode); |
| if (err) |
| goto cleanup; |
| err = ext4_xattr_inode_inc_ref(handle, ea_inode); |
| if (err) { |
| ext4_warning_inode(ea_inode, "inc ref error %d", err); |
| iput(ea_inode); |
| goto cleanup; |
| } |
| iput(ea_inode); |
| } |
| return 0; |
| |
| cleanup: |
| saved_err = err; |
| failed_entry = entry; |
| |
| for (entry = first; entry != failed_entry; |
| entry = EXT4_XATTR_NEXT(entry)) { |
| if (!entry->e_value_inum) |
| continue; |
| ea_ino = le32_to_cpu(entry->e_value_inum); |
| err = ext4_xattr_inode_iget(parent, ea_ino, |
| le32_to_cpu(entry->e_hash), |
| &ea_inode); |
| if (err) { |
| ext4_warning(parent->i_sb, |
| "cleanup ea_ino %u iget error %d", ea_ino, |
| err); |
| continue; |
| } |
| err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
| if (err) |
| ext4_warning_inode(ea_inode, "cleanup dec ref error %d", |
| err); |
| iput(ea_inode); |
| } |
| return saved_err; |
| } |
| |
| static void |
| ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, |
| struct buffer_head *bh, |
| struct ext4_xattr_entry *first, bool block_csum, |
| struct ext4_xattr_inode_array **ea_inode_array, |
| int extra_credits, bool skip_quota) |
| { |
| struct inode *ea_inode; |
| struct ext4_xattr_entry *entry; |
| bool dirty = false; |
| unsigned int ea_ino; |
| int err; |
| int credits; |
| |
| /* One credit for dec ref on ea_inode, one for orphan list addition, */ |
| credits = 2 + extra_credits; |
| |
| for (entry = first; !IS_LAST_ENTRY(entry); |
| entry = EXT4_XATTR_NEXT(entry)) { |
| if (!entry->e_value_inum) |
| continue; |
| ea_ino = le32_to_cpu(entry->e_value_inum); |
| err = ext4_xattr_inode_iget(parent, ea_ino, |
| le32_to_cpu(entry->e_hash), |
| &ea_inode); |
| if (err) |
| continue; |
| |
| err = ext4_expand_inode_array(ea_inode_array, ea_inode); |
| if (err) { |
| ext4_warning_inode(ea_inode, |
| "Expand inode array err=%d", err); |
| iput(ea_inode); |
| continue; |
| } |
| |
| err = ext4_xattr_ensure_credits(handle, parent, credits, bh, |
| dirty, block_csum); |
| if (err) { |
| ext4_warning_inode(ea_inode, "Ensure credits err=%d", |
| err); |
| continue; |
| } |
| |
| err = ext4_xattr_inode_dec_ref(handle, ea_inode); |
| if (err) { |
| ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", |
| err); |
| continue; |
| } |
| |
| if (!skip_quota) |
| ext4_xattr_inode_free_quota(parent, ea_inode, |
| le32_to_cpu(entry->e_value_size)); |
| |
| /* |
| * Forget about ea_inode within the same transaction that |
| * decrements the ref count. This avoids duplicate decrements in |
| * case the rest of the work spills over to subsequent |
| * transactions. |
| */ |
| entry->e_value_inum = 0; |
| entry->e_value_size = 0; |
| |
| dirty = true; |
| } |
| |
| if (dirty) { |
| /* |
| * Note that we are deliberately skipping csum calculation for |
| * the final update because we do not expect any journal |
| * restarts until xattr block is freed. |
| */ |
| |
| err = ext4_handle_dirty_metadata(handle, NULL, bh); |
| if (err) |
| ext4_warning_inode(parent, |
| "handle dirty metadata err=%d", err); |
| } |
| } |
| |
| /* |
| * Release the xattr block BH: If the reference count is > 1, decrement it; |
| * otherwise free the block. |
| */ |
| static void |
| ext4_xattr_release_block(handle_t *handle, struct inode *inode, |
| struct buffer_head *bh, |
| struct ext4_xattr_inode_array **ea_inode_array, |
| int extra_credits) |
| { |
| struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
| u32 hash, ref; |
| int error = 0; |
| |
| BUFFER_TRACE(bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, bh); |
| if (error) |
| goto out; |
| |
| lock_buffer(bh); |
| hash = le32_to_cpu(BHDR(bh)->h_hash); |
| ref = le32_to_cpu(BHDR(bh)->h_refcount); |
| if (ref == 1) { |
| ea_bdebug(bh, "refcount now=0; freeing"); |
| /* |
| * This must happen under buffer lock for |
| * ext4_xattr_block_set() to reliably detect freed block |
| */ |
| if (ea_block_cache) |
| mb_cache_entry_delete(ea_block_cache, hash, |
| bh->b_blocknr); |
| get_bh(bh); |
| unlock_buffer(bh); |
| |
| if (ext4_has_feature_ea_inode(inode->i_sb)) |
| ext4_xattr_inode_dec_ref_all(handle, inode, bh, |
| BFIRST(bh), |
| true /* block_csum */, |
| ea_inode_array, |
| extra_credits, |
| true /* skip_quota */); |
| ext4_free_blocks(handle, inode, bh, 0, 1, |
| EXT4_FREE_BLOCKS_METADATA | |
| EXT4_FREE_BLOCKS_FORGET); |
| } else { |
| ref--; |
| BHDR(bh)->h_refcount = cpu_to_le32(ref); |
| if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { |
| struct mb_cache_entry *ce; |
| |
| if (ea_block_cache) { |
| ce = mb_cache_entry_get(ea_block_cache, hash, |
| bh->b_blocknr); |
| if (ce) { |
| ce->e_reusable = 1; |
| mb_cache_entry_put(ea_block_cache, ce); |
| } |
| } |
| } |
| |
| ext4_xattr_block_csum_set(inode, bh); |
| /* |
| * Beware of this ugliness: Releasing of xattr block references |
| * from different inodes can race and so we have to protect |
| * from a race where someone else frees the block (and releases |
| * its journal_head) before we are done dirtying the buffer. In |
| * nojournal mode this race is harmless and we actually cannot |
| * call ext4_handle_dirty_metadata() with locked buffer as |
| * that function can call sync_dirty_buffer() so for that case |
| * we handle the dirtying after unlocking the buffer. |
| */ |
| if (ext4_handle_valid(handle)) |
| error = ext4_handle_dirty_metadata(handle, inode, bh); |
| unlock_buffer(bh); |
| if (!ext4_handle_valid(handle)) |
| error = ext4_handle_dirty_metadata(handle, inode, bh); |
| if (IS_SYNC(inode)) |
| ext4_handle_sync(handle); |
| dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); |
| ea_bdebug(bh, "refcount now=%d; releasing", |
| le32_to_cpu(BHDR(bh)->h_refcount)); |
| } |
| out: |
| ext4_std_error(inode->i_sb, error); |
| return; |
| } |
| |
| /* |
| * Find the available free space for EAs. This also returns the total number of |
| * bytes used by EA entries. |
| */ |
| static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, |
| size_t *min_offs, void *base, int *total) |
| { |
| for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| if (!last->e_value_inum && last->e_value_size) { |
| size_t offs = le16_to_cpu(last->e_value_offs); |
| if (offs < *min_offs) |
| *min_offs = offs; |
| } |
| if (total) |
| *total += EXT4_XATTR_LEN(last->e_name_len); |
| } |
| return (*min_offs - ((void *)last - base) - sizeof(__u32)); |
| } |
| |
| /* |
| * Write the value of the EA in an inode. |
| */ |
| static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, |
| const void *buf, int bufsize) |
| { |
| struct buffer_head *bh = NULL; |
| unsigned long block = 0; |
| int blocksize = ea_inode->i_sb->s_blocksize; |
| int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; |
| int csize, wsize = 0; |
| int ret = 0; |
| int retries = 0; |
| |
| retry: |
| while (ret >= 0 && ret < max_blocks) { |
| struct ext4_map_blocks map; |
| map.m_lblk = block += ret; |
| map.m_len = max_blocks -= ret; |
| |
| ret = ext4_map_blocks(handle, ea_inode, &map, |
| EXT4_GET_BLOCKS_CREATE); |
| if (ret <= 0) { |
| ext4_mark_inode_dirty(handle, ea_inode); |
| if (ret == -ENOSPC && |
| ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { |
| ret = 0; |
| goto retry; |
| } |
| break; |
| } |
| } |
| |
| if (ret < 0) |
| return ret; |
| |
| block = 0; |
| while (wsize < bufsize) { |
| if (bh != NULL) |
| brelse(bh); |
| csize = (bufsize - wsize) > blocksize ? blocksize : |
| bufsize - wsize; |
| bh = ext4_getblk(handle, ea_inode, block, 0); |
| if (IS_ERR(bh)) |
| return PTR_ERR(bh); |
| if (!bh) { |
| WARN_ON_ONCE(1); |
| EXT4_ERROR_INODE(ea_inode, |
| "ext4_getblk() return bh = NULL"); |
| return -EFSCORRUPTED; |
| } |
| ret = ext4_journal_get_write_access(handle, bh); |
| if (ret) |
| goto out; |
| |
| memcpy(bh->b_data, buf, csize); |
| set_buffer_uptodate(bh); |
| ext4_handle_dirty_metadata(handle, ea_inode, bh); |
| |
| buf += csize; |
| wsize += csize; |
| block += 1; |
| } |
| |
| inode_lock(ea_inode); |
| i_size_write(ea_inode, wsize); |
| ext4_update_i_disksize(ea_inode, wsize); |
| inode_unlock(ea_inode); |
| |
| ext4_mark_inode_dirty(handle, ea_inode); |
| |
| out: |
| brelse(bh); |
| |
| return ret; |
| } |
| |
| /* |
| * Create an inode to store the value of a large EA. |
| */ |
| static struct inode *ext4_xattr_inode_create(handle_t *handle, |
| struct inode *inode, u32 hash) |
| { |
| struct inode *ea_inode = NULL; |
| uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; |
| int err; |
| |
| /* |
| * Let the next inode be the goal, so we try and allocate the EA inode |
| * in the same group, or nearby one. |
| */ |
| ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, |
| S_IFREG | 0600, NULL, inode->i_ino + 1, owner, |
| EXT4_EA_INODE_FL); |
| if (!IS_ERR(ea_inode)) { |
| ea_inode->i_op = &ext4_file_inode_operations; |
| ea_inode->i_fop = &ext4_file_operations; |
| ext4_set_aops(ea_inode); |
| ext4_xattr_inode_set_class(ea_inode); |
| unlock_new_inode(ea_inode); |
| ext4_xattr_inode_set_ref(ea_inode, 1); |
| ext4_xattr_inode_set_hash(ea_inode, hash); |
| err = ext4_mark_inode_dirty(handle, ea_inode); |
| if (!err) |
| err = ext4_inode_attach_jinode(ea_inode); |
| if (err) { |
| iput(ea_inode); |
| return ERR_PTR(err); |
| } |
| |
| /* |
| * Xattr inodes are shared therefore quota charging is performed |
| * at a higher level. |
| */ |
| dquot_free_inode(ea_inode); |
| dquot_drop(ea_inode); |
| inode_lock(ea_inode); |
| ea_inode->i_flags |= S_NOQUOTA; |
| inode_unlock(ea_inode); |
| } |
| |
| return ea_inode; |
| } |
| |
| static struct inode * |
| ext4_xattr_inode_cache_find(struct inode *inode, const void *value, |
| size_t value_len, u32 hash) |
| { |
| struct inode *ea_inode; |
| struct mb_cache_entry *ce; |
| struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); |
| void *ea_data; |
| |
| if (!ea_inode_cache) |
| return NULL; |
| |
| ce = mb_cache_entry_find_first(ea_inode_cache, hash); |
| if (!ce) |
| return NULL; |
| |
| WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && |
| !(current->flags & PF_MEMALLOC_NOFS)); |
| |
| ea_data = ext4_kvmalloc(value_len, GFP_NOFS); |
| if (!ea_data) { |
| mb_cache_entry_put(ea_inode_cache, ce); |
| return NULL; |
| } |
| |
| while (ce) { |
| ea_inode = ext4_iget(inode->i_sb, ce->e_value, |
| EXT4_IGET_NORMAL); |
| if (!IS_ERR(ea_inode) && |
| !is_bad_inode(ea_inode) && |
| (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && |
| i_size_read(ea_inode) == value_len && |
| !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && |
| !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, |
| value_len) && |
| !memcmp(value, ea_data, value_len)) { |
| mb_cache_entry_touch(ea_inode_cache, ce); |
| mb_cache_entry_put(ea_inode_cache, ce); |
| kvfree(ea_data); |
| return ea_inode; |
| } |
| |
| if (!IS_ERR(ea_inode)) |
| iput(ea_inode); |
| ce = mb_cache_entry_find_next(ea_inode_cache, ce); |
| } |
| kvfree(ea_data); |
| return NULL; |
| } |
| |
| /* |
| * Add value of the EA in an inode. |
| */ |
| static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, |
| const void *value, size_t value_len, |
| struct inode **ret_inode) |
| { |
| struct inode *ea_inode; |
| u32 hash; |
| int err; |
| |
| hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); |
| ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); |
| if (ea_inode) { |
| err = ext4_xattr_inode_inc_ref(handle, ea_inode); |
| if (err) { |
| iput(ea_inode); |
| return err; |
| } |
| |
| *ret_inode = ea_inode; |
| return 0; |
| } |
| |
| /* Create an inode for the EA value */ |
| ea_inode = ext4_xattr_inode_create(handle, inode, hash); |
| if (IS_ERR(ea_inode)) |
| return PTR_ERR(ea_inode); |
| |
| err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); |
| if (err) { |
| ext4_xattr_inode_dec_ref(handle, ea_inode); |
| iput(ea_inode); |
| return err; |
| } |
| |
| if (EA_INODE_CACHE(inode)) |
| mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, |
| ea_inode->i_ino, true /* reusable */); |
| |
| *ret_inode = ea_inode; |
| return 0; |
| } |
| |
| /* |
| * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode |
| * feature is enabled. |
| */ |
| #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) |
| |
| static int ext4_xattr_set_entry(struct ext4_xattr_info *i, |
| struct ext4_xattr_search *s, |
| handle_t *handle, struct inode *inode, |
| bool is_block) |
| { |
| struct ext4_xattr_entry *last, *next; |
| struct ext4_xattr_entry *here = s->here; |
| size_t min_offs = s->end - s->base, name_len = strlen(i->name); |
| int in_inode = i->in_inode; |
| struct inode *old_ea_inode = NULL; |
| struct inode *new_ea_inode = NULL; |
| size_t old_size, new_size; |
| int ret; |
| |
| /* Space used by old and new values. */ |
| old_size = (!s->not_found && !here->e_value_inum) ? |
| EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; |
| new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; |
| |
| /* |
| * Optimization for the simple case when old and new values have the |
| * same padded sizes. Not applicable if external inodes are involved. |
| */ |
| if (new_size && new_size == old_size) { |
| size_t offs = le16_to_cpu(here->e_value_offs); |
| void *val = s->base + offs; |
| |
| here->e_value_size = cpu_to_le32(i->value_len); |
| if (i->value == EXT4_ZERO_XATTR_VALUE) { |
| memset(val, 0, new_size); |
| } else { |
| memcpy(val, i->value, i->value_len); |
| /* Clear padding bytes. */ |
| memset(val + i->value_len, 0, new_size - i->value_len); |
| } |
| goto update_hash; |
| } |
| |
| /* Compute min_offs and last. */ |
| last = s->first; |
| for (; !IS_LAST_ENTRY(last); last = next) { |
| next = EXT4_XATTR_NEXT(last); |
| if ((void *)next >= s->end) { |
| EXT4_ERROR_INODE(inode, "corrupted xattr entries"); |
| ret = -EFSCORRUPTED; |
| goto out; |
| } |
| if (!last->e_value_inum && last->e_value_size) { |
| size_t offs = le16_to_cpu(last->e_value_offs); |
| if (offs < min_offs) |
| min_offs = offs; |
| } |
| } |
| |
| /* Check whether we have enough space. */ |
| if (i->value) { |
| size_t free; |
| |
| free = min_offs - ((void *)last - s->base) - sizeof(__u32); |
| if (!s->not_found) |
| free += EXT4_XATTR_LEN(name_len) + old_size; |
| |
| if (free < EXT4_XATTR_LEN(name_len) + new_size) { |
| ret = -ENOSPC; |
| goto out; |
| } |
| |
| /* |
| * If storing the value in an external inode is an option, |
| * reserve space for xattr entries/names in the external |
| * attribute block so that a long value does not occupy the |
| * whole space and prevent futher entries being added. |
| */ |
| if (ext4_has_feature_ea_inode(inode->i_sb) && |
| new_size && is_block && |
| (min_offs + old_size - new_size) < |
| EXT4_XATTR_BLOCK_RESERVE(inode)) { |
| ret = -ENOSPC; |
| goto out; |
| } |
| } |
| |
| /* |
| * Getting access to old and new ea inodes is subject to failures. |
| * Finish that work before doing any modifications to the xattr data. |
| */ |
| if (!s->not_found && here->e_value_inum) { |
| ret = ext4_xattr_inode_iget(inode, |
| le32_to_cpu(here->e_value_inum), |
| le32_to_cpu(here->e_hash), |
| &old_ea_inode); |
| if (ret) { |
| old_ea_inode = NULL; |
| goto out; |
| } |
| } |
| if (i->value && in_inode) { |
| WARN_ON_ONCE(!i->value_len); |
| |
| ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); |
| if (ret) |
| goto out; |
| |
| ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, |
| i->value_len, |
| &new_ea_inode); |
| if (ret) { |
| new_ea_inode = NULL; |
| ext4_xattr_inode_free_quota(inode, NULL, i->value_len); |
| goto out; |
| } |
| } |
| |
| if (old_ea_inode) { |
| /* We are ready to release ref count on the old_ea_inode. */ |
| ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); |
| if (ret) { |
| /* Release newly required ref count on new_ea_inode. */ |
| if (new_ea_inode) { |
| int err; |
| |
| err = ext4_xattr_inode_dec_ref(handle, |
| new_ea_inode); |
| if (err) |
| ext4_warning_inode(new_ea_inode, |
| "dec ref new_ea_inode err=%d", |
| err); |
| ext4_xattr_inode_free_quota(inode, new_ea_inode, |
| i->value_len); |
| } |
| goto out; |
| } |
| |
| ext4_xattr_inode_free_quota(inode, old_ea_inode, |
| le32_to_cpu(here->e_value_size)); |
| } |
| |
| /* No failures allowed past this point. */ |
| |
| if (!s->not_found && here->e_value_size && !here->e_value_inum) { |
| /* Remove the old value. */ |
| void *first_val = s->base + min_offs; |
| size_t offs = le16_to_cpu(here->e_value_offs); |
| void *val = s->base + offs; |
| |
| memmove(first_val + old_size, first_val, val - first_val); |
| memset(first_val, 0, old_size); |
| min_offs += old_size; |
| |
| /* Adjust all value offsets. */ |
| last = s->first; |
| while (!IS_LAST_ENTRY(last)) { |
| size_t o = le16_to_cpu(last->e_value_offs); |
| |
| if (!last->e_value_inum && |
| last->e_value_size && o < offs) |
| last->e_value_offs = cpu_to_le16(o + old_size); |
| last = EXT4_XATTR_NEXT(last); |
| } |
| } |
| |
| if (!i->value) { |
| /* Remove old name. */ |
| size_t size = EXT4_XATTR_LEN(name_len); |
| |
| last = ENTRY((void *)last - size); |
| memmove(here, (void *)here + size, |
| (void *)last - (void *)here + sizeof(__u32)); |
| memset(last, 0, size); |
| } else if (s->not_found) { |
| /* Insert new name. */ |
| size_t size = EXT4_XATTR_LEN(name_len); |
| size_t rest = (void *)last - (void *)here + sizeof(__u32); |
| |
| memmove((void *)here + size, here, rest); |
| memset(here, 0, size); |
| here->e_name_index = i->name_index; |
| here->e_name_len = name_len; |
| memcpy(here->e_name, i->name, name_len); |
| } else { |
| /* This is an update, reset value info. */ |
| here->e_value_inum = 0; |
| here->e_value_offs = 0; |
| here->e_value_size = 0; |
| } |
| |
| if (i->value) { |
| /* Insert new value. */ |
| if (in_inode) { |
| here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); |
| } else if (i->value_len) { |
| void *val = s->base + min_offs - new_size; |
| |
| here->e_value_offs = cpu_to_le16(min_offs - new_size); |
| if (i->value == EXT4_ZERO_XATTR_VALUE) { |
| memset(val, 0, new_size); |
| } else { |
| memcpy(val, i->value, i->value_len); |
| /* Clear padding bytes. */ |
| memset(val + i->value_len, 0, |
| new_size - i->value_len); |
| } |
| } |
| here->e_value_size = cpu_to_le32(i->value_len); |
| } |
| |
| update_hash: |
| if (i->value) { |
| __le32 hash = 0; |
| |
| /* Entry hash calculation. */ |
| if (in_inode) { |
| __le32 crc32c_hash; |
| |
| /* |
| * Feed crc32c hash instead of the raw value for entry |
| * hash calculation. This is to avoid walking |
| * potentially long value buffer again. |
| */ |
| crc32c_hash = cpu_to_le32( |
| ext4_xattr_inode_get_hash(new_ea_inode)); |
| hash = ext4_xattr_hash_entry(here->e_name, |
| here->e_name_len, |
| &crc32c_hash, 1); |
| } else if (is_block) { |
| __le32 *value = s->base + le16_to_cpu( |
| here->e_value_offs); |
| |
| hash = ext4_xattr_hash_entry(here->e_name, |
| here->e_name_len, value, |
| new_size >> 2); |
| } |
| here->e_hash = hash; |
| } |
| |
| if (is_block) |
| ext4_xattr_rehash((struct ext4_xattr_header *)s->base); |
| |
| ret = 0; |
| out: |
| iput(old_ea_inode); |
| iput(new_ea_inode); |
| return ret; |
| } |
| |
| struct ext4_xattr_block_find { |
| struct ext4_xattr_search s; |
| struct buffer_head *bh; |
| }; |
| |
| static int |
| ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, |
| struct ext4_xattr_block_find *bs) |
| { |
| struct super_block *sb = inode->i_sb; |
| int error; |
| |
| ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", |
| i->name_index, i->name, i->value, (long)i->value_len); |
| |
| if (EXT4_I(inode)->i_file_acl) { |
| /* The inode already has an extended attribute block. */ |
| bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bs->bh)) { |
| error = PTR_ERR(bs->bh); |
| bs->bh = NULL; |
| return error; |
| } |
| ea_bdebug(bs->bh, "b_count=%d, refcount=%d", |
| atomic_read(&(bs->bh->b_count)), |
| le32_to_cpu(BHDR(bs->bh)->h_refcount)); |
| error = ext4_xattr_check_block(inode, bs->bh); |
| if (error) |
| return error; |
| /* Find the named attribute. */ |
| bs->s.base = BHDR(bs->bh); |
| bs->s.first = BFIRST(bs->bh); |
| bs->s.end = bs->bh->b_data + bs->bh->b_size; |
| bs->s.here = bs->s.first; |
| error = xattr_find_entry(inode, &bs->s.here, bs->s.end, |
| i->name_index, i->name, 1); |
| if (error && error != -ENODATA) |
| return error; |
| bs->s.not_found = error; |
| } |
| return 0; |
| } |
| |
| static int |
| ext4_xattr_block_set(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_info *i, |
| struct ext4_xattr_block_find *bs) |
| { |
| struct super_block *sb = inode->i_sb; |
| struct buffer_head *new_bh = NULL; |
| struct ext4_xattr_search s_copy = bs->s; |
| struct ext4_xattr_search *s = &s_copy; |
| struct mb_cache_entry *ce = NULL; |
| int error = 0; |
| struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); |
| struct inode *ea_inode = NULL, *tmp_inode; |
| size_t old_ea_inode_quota = 0; |
| unsigned int ea_ino; |
| |
| |
| #define header(x) ((struct ext4_xattr_header *)(x)) |
| |
| if (s->base) { |
| BUFFER_TRACE(bs->bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, bs->bh); |
| if (error) |
| goto cleanup; |
| lock_buffer(bs->bh); |
| |
| if (header(s->base)->h_refcount == cpu_to_le32(1)) { |
| __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); |
| |
| /* |
| * This must happen under buffer lock for |
| * ext4_xattr_block_set() to reliably detect modified |
| * block |
| */ |
| if (ea_block_cache) |
| mb_cache_entry_delete(ea_block_cache, hash, |
| bs->bh->b_blocknr); |
| ea_bdebug(bs->bh, "modifying in-place"); |
| error = ext4_xattr_set_entry(i, s, handle, inode, |
| true /* is_block */); |
| ext4_xattr_block_csum_set(inode, bs->bh); |
| unlock_buffer(bs->bh); |
| if (error == -EFSCORRUPTED) |
| goto bad_block; |
| if (!error) |
| error = ext4_handle_dirty_metadata(handle, |
| inode, |
| bs->bh); |
| if (error) |
| goto cleanup; |
| goto inserted; |
| } else { |
| int offset = (char *)s->here - bs->bh->b_data; |
| |
| unlock_buffer(bs->bh); |
| ea_bdebug(bs->bh, "cloning"); |
| s->base = kmalloc(bs->bh->b_size, GFP_NOFS); |
| error = -ENOMEM; |
| if (s->base == NULL) |
| goto cleanup; |
| memcpy(s->base, BHDR(bs->bh), bs->bh->b_size); |
| s->first = ENTRY(header(s->base)+1); |
| header(s->base)->h_refcount = cpu_to_le32(1); |
| s->here = ENTRY(s->base + offset); |
| s->end = s->base + bs->bh->b_size; |
| |
| /* |
| * If existing entry points to an xattr inode, we need |
| * to prevent ext4_xattr_set_entry() from decrementing |
| * ref count on it because the reference belongs to the |
| * original block. In this case, make the entry look |
| * like it has an empty value. |
| */ |
| if (!s->not_found && s->here->e_value_inum) { |
| ea_ino = le32_to_cpu(s->here->e_value_inum); |
| error = ext4_xattr_inode_iget(inode, ea_ino, |
| le32_to_cpu(s->here->e_hash), |
| &tmp_inode); |
| if (error) |
| goto cleanup; |
| |
| if (!ext4_test_inode_state(tmp_inode, |
| EXT4_STATE_LUSTRE_EA_INODE)) { |
| /* |
| * Defer quota free call for previous |
| * inode until success is guaranteed. |
| */ |
| old_ea_inode_quota = le32_to_cpu( |
| s->here->e_value_size); |
| } |
| iput(tmp_inode); |
| |
| s->here->e_value_inum = 0; |
| s->here->e_value_size = 0; |
| } |
| } |
| } else { |
| /* Allocate a buffer where we construct the new block. */ |
| s->base = kzalloc(sb->s_blocksize, GFP_NOFS); |
| /* assert(header == s->base) */ |
| error = -ENOMEM; |
| if (s->base == NULL) |
| goto cleanup; |
| header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
| header(s->base)->h_blocks = cpu_to_le32(1); |
| header(s->base)->h_refcount = cpu_to_le32(1); |
| s->first = ENTRY(header(s->base)+1); |
| s->here = ENTRY(header(s->base)+1); |
| s->end = s->base + sb->s_blocksize; |
| } |
| |
| error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); |
| if (error == -EFSCORRUPTED) |
| goto bad_block; |
| if (error) |
| goto cleanup; |
| |
| if (i->value && s->here->e_value_inum) { |
| /* |
| * A ref count on ea_inode has been taken as part of the call to |
| * ext4_xattr_set_entry() above. We would like to drop this |
| * extra ref but we have to wait until the xattr block is |
| * initialized and has its own ref count on the ea_inode. |
| */ |
| ea_ino = le32_to_cpu(s->here->e_value_inum); |
| error = ext4_xattr_inode_iget(inode, ea_ino, |
| le32_to_cpu(s->here->e_hash), |
| &ea_inode); |
| if (error) { |
| ea_inode = NULL; |
| goto cleanup; |
| } |
| } |
| |
| inserted: |
| if (!IS_LAST_ENTRY(s->first)) { |
| new_bh = ext4_xattr_block_cache_find(inode, header(s->base), |
| &ce); |
| if (new_bh) { |
| /* We found an identical block in the cache. */ |
| if (new_bh == bs->bh) |
| ea_bdebug(new_bh, "keeping"); |
| else { |
| u32 ref; |
| |
| WARN_ON_ONCE(dquot_initialize_needed(inode)); |
| |
| /* The old block is released after updating |
| the inode. */ |
| error = dquot_alloc_block(inode, |
| EXT4_C2B(EXT4_SB(sb), 1)); |
| if (error) |
| goto cleanup; |
| BUFFER_TRACE(new_bh, "get_write_access"); |
| error = ext4_journal_get_write_access(handle, |
| new_bh); |
| if (error) |
| goto cleanup_dquot; |
| lock_buffer(new_bh); |
| /* |
| * We have to be careful about races with |
| * freeing, rehashing or adding references to |
| * xattr block. Once we hold buffer lock xattr |
| * block's state is stable so we can check |
| * whether the block got freed / rehashed or |
| * not. Since we unhash mbcache entry under |
| * buffer lock when freeing / rehashing xattr |
| * block, checking whether entry is still |
| * hashed is reliable. Same rules hold for |
| * e_reusable handling. |
| */ |
| if (hlist_bl_unhashed(&ce->e_hash_list) || |
| !ce->e_reusable) { |
| /* |
| * Undo everything and check mbcache |
| * again. |
| */ |
| unlock_buffer(new_bh); |
| dquot_free_block(inode, |
| EXT4_C2B(EXT4_SB(sb), |
| 1)); |
| brelse(new_bh); |
| mb_cache_entry_put(ea_block_cache, ce); |
| ce = NULL; |
| new_bh = NULL; |
| goto inserted; |
| } |
| ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; |
| BHDR(new_bh)->h_refcount = cpu_to_le32(ref); |
| if (ref >= EXT4_XATTR_REFCOUNT_MAX) |
| ce->e_reusable = 0; |
| ea_bdebug(new_bh, "reusing; refcount now=%d", |
| ref); |
| ext4_xattr_block_csum_set(inode, new_bh); |
| unlock_buffer(new_bh); |
| error = ext4_handle_dirty_metadata(handle, |
| inode, |
| new_bh); |
| if (error) |
| goto cleanup_dquot; |
| } |
| mb_cache_entry_touch(ea_block_cache, ce); |
| mb_cache_entry_put(ea_block_cache, ce); |
| ce = NULL; |
| } else if (bs->bh && s->base == bs->bh->b_data) { |
| /* We were modifying this block in-place. */ |
| ea_bdebug(bs->bh, "keeping this block"); |
| ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); |
| new_bh = bs->bh; |
| get_bh(new_bh); |
| } else { |
| /* We need to allocate a new block */ |
| ext4_fsblk_t goal, block; |
| |
| WARN_ON_ONCE(dquot_initialize_needed(inode)); |
| |
| goal = ext4_group_first_block_no(sb, |
| EXT4_I(inode)->i_block_group); |
| |
| /* non-extent files can't have physical blocks past 2^32 */ |
| if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| goal = goal & EXT4_MAX_BLOCK_FILE_PHYS; |
| |
| block = ext4_new_meta_blocks(handle, inode, goal, 0, |
| NULL, &error); |
| if (error) |
| goto cleanup; |
| |
| if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
| BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS); |
| |
| ea_idebug(inode, "creating block %llu", |
| (unsigned long long)block); |
| |
| new_bh = sb_getblk(sb, block); |
| if (unlikely(!new_bh)) { |
| error = -ENOMEM; |
| getblk_failed: |
| ext4_free_blocks(handle, inode, NULL, block, 1, |
| EXT4_FREE_BLOCKS_METADATA); |
| goto cleanup; |
| } |
| error = ext4_xattr_inode_inc_ref_all(handle, inode, |
| ENTRY(header(s->base)+1)); |
| if (error) |
| goto getblk_failed; |
| if (ea_inode) { |
| /* Drop the extra ref on ea_inode. */ |
| error = ext4_xattr_inode_dec_ref(handle, |
| ea_inode); |
| if (error) |
| ext4_warning_inode(ea_inode, |
| "dec ref error=%d", |
| error); |
| iput(ea_inode); |
| ea_inode = NULL; |
| } |
| |
| lock_buffer(new_bh); |
| error = ext4_journal_get_create_access(handle, new_bh); |
| if (error) { |
| unlock_buffer(new_bh); |
| error = -EIO; |
| goto getblk_failed; |
| } |
| memcpy(new_bh->b_data, s->base, new_bh->b_size); |
| ext4_xattr_block_csum_set(inode, new_bh); |
| set_buffer_uptodate(new_bh); |
| unlock_buffer(new_bh); |
| ext4_xattr_block_cache_insert(ea_block_cache, new_bh); |
| error = ext4_handle_dirty_metadata(handle, inode, |
| new_bh); |
| if (error) |
| goto cleanup; |
| } |
| } |
| |
| if (old_ea_inode_quota) |
| ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); |
| |
| /* Update the inode. */ |
| EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; |
| |
| /* Drop the previous xattr block. */ |
| if (bs->bh && bs->bh != new_bh) { |
| struct ext4_xattr_inode_array *ea_inode_array = NULL; |
| |
| ext4_xattr_release_block(handle, inode, bs->bh, |
| &ea_inode_array, |
| 0 /* extra_credits */); |
| ext4_xattr_inode_array_free(ea_inode_array); |
| } |
| error = 0; |
| |
| cleanup: |
| if (ea_inode) { |
| int error2; |
| |
| error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); |
| if (error2) |
| ext4_warning_inode(ea_inode, "dec ref error=%d", |
| error2); |
| |
| /* If there was an error, revert the quota charge. */ |
| if (error) |
| ext4_xattr_inode_free_quota(inode, ea_inode, |
| i_size_read(ea_inode)); |
| iput(ea_inode); |
| } |
| if (ce) |
| mb_cache_entry_put(ea_block_cache, ce); |
| brelse(new_bh); |
| if (!(bs->bh && s->base == bs->bh->b_data)) |
| kfree(s->base); |
| |
| return error; |
| |
| cleanup_dquot: |
| dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); |
| goto cleanup; |
| |
| bad_block: |
| EXT4_ERROR_INODE(inode, "bad block %llu", |
| EXT4_I(inode)->i_file_acl); |
| goto cleanup; |
| |
| #undef header |
| } |
| |
| int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_inode *raw_inode; |
| int error; |
| |
| if (EXT4_I(inode)->i_extra_isize == 0) |
| return 0; |
| raw_inode = ext4_raw_inode(&is->iloc); |
| header = IHDR(inode, raw_inode); |
| is->s.base = is->s.first = IFIRST(header); |
| is->s.here = is->s.first; |
| is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
| error = xattr_check_inode(inode, header, is->s.end); |
| if (error) |
| return error; |
| /* Find the named attribute. */ |
| error = xattr_find_entry(inode, &is->s.here, is->s.end, |
| i->name_index, i->name, 0); |
| if (error && error != -ENODATA) |
| return error; |
| is->s.not_found = error; |
| } |
| return 0; |
| } |
| |
| int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_xattr_search *s = &is->s; |
| int error; |
| |
| if (EXT4_I(inode)->i_extra_isize == 0) |
| return -ENOSPC; |
| error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
| if (error) |
| return error; |
| header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
| if (!IS_LAST_ENTRY(s->first)) { |
| header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
| ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
| } else { |
| header->h_magic = cpu_to_le32(0); |
| ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
| } |
| return 0; |
| } |
| |
| static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_info *i, |
| struct ext4_xattr_ibody_find *is) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_xattr_search *s = &is->s; |
| int error; |
| |
| if (EXT4_I(inode)->i_extra_isize == 0) |
| return -ENOSPC; |
| error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); |
| if (error) |
| return error; |
| header = IHDR(inode, ext4_raw_inode(&is->iloc)); |
| if (!IS_LAST_ENTRY(s->first)) { |
| header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); |
| ext4_set_inode_state(inode, EXT4_STATE_XATTR); |
| } else { |
| header->h_magic = cpu_to_le32(0); |
| ext4_clear_inode_state(inode, EXT4_STATE_XATTR); |
| } |
| return 0; |
| } |
| |
| static int ext4_xattr_value_same(struct ext4_xattr_search *s, |
| struct ext4_xattr_info *i) |
| { |
| void *value; |
| |
| /* When e_value_inum is set the value is stored externally. */ |
| if (s->here->e_value_inum) |
| return 0; |
| if (le32_to_cpu(s->here->e_value_size) != i->value_len) |
| return 0; |
| value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); |
| return !memcmp(value, i->value, i->value_len); |
| } |
| |
| static struct buffer_head *ext4_xattr_get_block(struct inode *inode) |
| { |
| struct buffer_head *bh; |
| int error; |
| |
| if (!EXT4_I(inode)->i_file_acl) |
| return NULL; |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) |
| return bh; |
| error = ext4_xattr_check_block(inode, bh); |
| if (error) { |
| brelse(bh); |
| return ERR_PTR(error); |
| } |
| return bh; |
| } |
| |
| /* |
| * ext4_xattr_set_handle() |
| * |
| * Create, replace or remove an extended attribute for this inode. Value |
| * is NULL to remove an existing extended attribute, and non-NULL to |
| * either replace an existing extended attribute, or create a new extended |
| * attribute. The flags XATTR_REPLACE and XATTR_CREATE |
| * specify that an extended attribute must exist and must not exist |
| * previous to the call, respectively. |
| * |
| * Returns 0, or a negative error number on failure. |
| */ |
| int |
| ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, |
| const char *name, const void *value, size_t value_len, |
| int flags) |
| { |
| struct ext4_xattr_info i = { |
| .name_index = name_index, |
| .name = name, |
| .value = value, |
| .value_len = value_len, |
| .in_inode = 0, |
| }; |
| struct ext4_xattr_ibody_find is = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| struct ext4_xattr_block_find bs = { |
| .s = { .not_found = -ENODATA, }, |
| }; |
| int no_expand; |
| int error; |
| |
| if (!name) |
| return -EINVAL; |
| if (strlen(name) > 255) |
| return -ERANGE; |
| |
| ext4_write_lock_xattr(inode, &no_expand); |
| |
| /* Check journal credits under write lock. */ |
| if (ext4_handle_valid(handle)) { |
| struct buffer_head *bh; |
| int credits; |
| |
| bh = ext4_xattr_get_block(inode); |
| if (IS_ERR(bh)) { |
| error = PTR_ERR(bh); |
| goto cleanup; |
| } |
| |
| credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
| value_len, |
| flags & XATTR_CREATE); |
| brelse(bh); |
| |
| if (!ext4_handle_has_enough_credits(handle, credits)) { |
| error = -ENOSPC; |
| goto cleanup; |
| } |
| WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); |
| } |
| |
| error = ext4_reserve_inode_write(handle, inode, &is.iloc); |
| if (error) |
| goto cleanup; |
| |
| if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { |
| struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); |
| memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); |
| ext4_clear_inode_state(inode, EXT4_STATE_NEW); |
| } |
| |
| error = ext4_xattr_ibody_find(inode, &i, &is); |
| if (error) |
| goto cleanup; |
| if (is.s.not_found) |
| error = ext4_xattr_block_find(inode, &i, &bs); |
| if (error) |
| goto cleanup; |
| if (is.s.not_found && bs.s.not_found) { |
| error = -ENODATA; |
| if (flags & XATTR_REPLACE) |
| goto cleanup; |
| error = 0; |
| if (!value) |
| goto cleanup; |
| } else { |
| error = -EEXIST; |
| if (flags & XATTR_CREATE) |
| goto cleanup; |
| } |
| |
| if (!value) { |
| if (!is.s.not_found) |
| error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
| else if (!bs.s.not_found) |
| error = ext4_xattr_block_set(handle, inode, &i, &bs); |
| } else { |
| error = 0; |
| /* Xattr value did not change? Save us some work and bail out */ |
| if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) |
| goto cleanup; |
| if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) |
| goto cleanup; |
| |
| if (ext4_has_feature_ea_inode(inode->i_sb) && |
| (EXT4_XATTR_SIZE(i.value_len) > |
| EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) |
| i.in_inode = 1; |
| retry_inode: |
| error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
| if (!error && !bs.s.not_found) { |
| i.value = NULL; |
| error = ext4_xattr_block_set(handle, inode, &i, &bs); |
| } else if (error == -ENOSPC) { |
| if (EXT4_I(inode)->i_file_acl && !bs.s.base) { |
| brelse(bs.bh); |
| bs.bh = NULL; |
| error = ext4_xattr_block_find(inode, &i, &bs); |
| if (error) |
| goto cleanup; |
| } |
| error = ext4_xattr_block_set(handle, inode, &i, &bs); |
| if (!error && !is.s.not_found) { |
| i.value = NULL; |
| error = ext4_xattr_ibody_set(handle, inode, &i, |
| &is); |
| } else if (error == -ENOSPC) { |
| /* |
| * Xattr does not fit in the block, store at |
| * external inode if possible. |
| */ |
| if (ext4_has_feature_ea_inode(inode->i_sb) && |
| i.value_len && !i.in_inode) { |
| i.in_inode = 1; |
| goto retry_inode; |
| } |
| } |
| } |
| } |
| if (!error) { |
| ext4_xattr_update_super_block(handle, inode->i_sb); |
| inode->i_ctime = current_time(inode); |
| if (!value) |
| no_expand = 0; |
| error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
| /* |
| * The bh is consumed by ext4_mark_iloc_dirty, even with |
| * error != 0. |
| */ |
| is.iloc.bh = NULL; |
| if (IS_SYNC(inode)) |
| ext4_handle_sync(handle); |
| } |
| |
| cleanup: |
| brelse(is.iloc.bh); |
| brelse(bs.bh); |
| ext4_write_unlock_xattr(inode, &no_expand); |
| return error; |
| } |
| |
| int ext4_xattr_set_credits(struct inode *inode, size_t value_len, |
| bool is_create, int *credits) |
| { |
| struct buffer_head *bh; |
| int err; |
| |
| *credits = 0; |
| |
| if (!EXT4_SB(inode->i_sb)->s_journal) |
| return 0; |
| |
| down_read(&EXT4_I(inode)->xattr_sem); |
| |
| bh = ext4_xattr_get_block(inode); |
| if (IS_ERR(bh)) { |
| err = PTR_ERR(bh); |
| } else { |
| *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, |
| value_len, is_create); |
| brelse(bh); |
| err = 0; |
| } |
| |
| up_read(&EXT4_I(inode)->xattr_sem); |
| return err; |
| } |
| |
| /* |
| * ext4_xattr_set() |
| * |
| * Like ext4_xattr_set_handle, but start from an inode. This extended |
| * attribute modification is a filesystem transaction by itself. |
| * |
| * Returns 0, or a negative error number on failure. |
| */ |
| int |
| ext4_xattr_set(struct inode *inode, int name_index, const char *name, |
| const void *value, size_t value_len, int flags) |
| { |
| handle_t *handle; |
| struct super_block *sb = inode->i_sb; |
| int error, retries = 0; |
| int credits; |
| |
| error = dquot_initialize(inode); |
| if (error) |
| return error; |
| |
| retry: |
| error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, |
| &credits); |
| if (error) |
| return error; |
| |
| handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); |
| if (IS_ERR(handle)) { |
| error = PTR_ERR(handle); |
| } else { |
| int error2; |
| |
| error = ext4_xattr_set_handle(handle, inode, name_index, name, |
| value, value_len, flags); |
| error2 = ext4_journal_stop(handle); |
| if (error == -ENOSPC && |
| ext4_should_retry_alloc(sb, &retries)) |
| goto retry; |
| if (error == 0) |
| error = error2; |
| } |
| |
| return error; |
| } |
| |
| /* |
| * Shift the EA entries in the inode to create space for the increased |
| * i_extra_isize. |
| */ |
| static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, |
| int value_offs_shift, void *to, |
| void *from, size_t n) |
| { |
| struct ext4_xattr_entry *last = entry; |
| int new_offs; |
| |
| /* We always shift xattr headers further thus offsets get lower */ |
| BUG_ON(value_offs_shift > 0); |
| |
| /* Adjust the value offsets of the entries */ |
| for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| if (!last->e_value_inum && last->e_value_size) { |
| new_offs = le16_to_cpu(last->e_value_offs) + |
| value_offs_shift; |
| last->e_value_offs = cpu_to_le16(new_offs); |
| } |
| } |
| /* Shift the entries by n bytes */ |
| memmove(to, from, n); |
| } |
| |
| /* |
| * Move xattr pointed to by 'entry' from inode into external xattr block |
| */ |
| static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, |
| struct ext4_inode *raw_inode, |
| struct ext4_xattr_entry *entry) |
| { |
| struct ext4_xattr_ibody_find *is = NULL; |
| struct ext4_xattr_block_find *bs = NULL; |
| char *buffer = NULL, *b_entry_name = NULL; |
| size_t value_size = le32_to_cpu(entry->e_value_size); |
| struct ext4_xattr_info i = { |
| .value = NULL, |
| .value_len = 0, |
| .name_index = entry->e_name_index, |
| .in_inode = !!entry->e_value_inum, |
| }; |
| struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); |
| int error; |
| |
| is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); |
| bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); |
| buffer = kmalloc(value_size, GFP_NOFS); |
| b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); |
| if (!is || !bs || !buffer || !b_entry_name) { |
| error = -ENOMEM; |
| goto out; |
| } |
| |
| is->s.not_found = -ENODATA; |
| bs->s.not_found = -ENODATA; |
| is->iloc.bh = NULL; |
| bs->bh = NULL; |
| |
| /* Save the entry name and the entry value */ |
| if (entry->e_value_inum) { |
| error = ext4_xattr_inode_get(inode, entry, buffer, value_size); |
| if (error) |
| goto out; |
| } else { |
| size_t value_offs = le16_to_cpu(entry->e_value_offs); |
| memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size); |
| } |
| |
| memcpy(b_entry_name, entry->e_name, entry->e_name_len); |
| b_entry_name[entry->e_name_len] = '\0'; |
| i.name = b_entry_name; |
| |
| error = ext4_get_inode_loc(inode, &is->iloc); |
| if (error) |
| goto out; |
| |
| error = ext4_xattr_ibody_find(inode, &i, is); |
| if (error) |
| goto out; |
| |
| /* Remove the chosen entry from the inode */ |
| error = ext4_xattr_ibody_set(handle, inode, &i, is); |
| if (error) |
| goto out; |
| |
| i.value = buffer; |
| i.value_len = value_size; |
| error = ext4_xattr_block_find(inode, &i, bs); |
| if (error) |
| goto out; |
| |
| /* Add entry which was removed from the inode into the block */ |
| error = ext4_xattr_block_set(handle, inode, &i, bs); |
| if (error) |
| goto out; |
| error = 0; |
| out: |
| kfree(b_entry_name); |
| kfree(buffer); |
| if (is) |
| brelse(is->iloc.bh); |
| if (bs) |
| brelse(bs->bh); |
| kfree(is); |
| kfree(bs); |
| |
| return error; |
| } |
| |
| static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, |
| struct ext4_inode *raw_inode, |
| int isize_diff, size_t ifree, |
| size_t bfree, int *total_ino) |
| { |
| struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); |
| struct ext4_xattr_entry *small_entry; |
| struct ext4_xattr_entry *entry; |
| struct ext4_xattr_entry *last; |
| unsigned int entry_size; /* EA entry size */ |
| unsigned int total_size; /* EA entry size + value size */ |
| unsigned int min_total_size; |
| int error; |
| |
| while (isize_diff > ifree) { |
| entry = NULL; |
| small_entry = NULL; |
| min_total_size = ~0U; |
| last = IFIRST(header); |
| /* Find the entry best suited to be pushed into EA block */ |
| for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { |
| /* never move system.data out of the inode */ |
| if ((last->e_name_len == 4) && |
| (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && |
| !memcmp(last->e_name, "data", 4)) |
| continue; |
| total_size = EXT4_XATTR_LEN(last->e_name_len); |
| if (!last->e_value_inum) |
| total_size += EXT4_XATTR_SIZE( |
| le32_to_cpu(last->e_value_size)); |
| if (total_size <= bfree && |
| total_size < min_total_size) { |
| if (total_size + ifree < isize_diff) { |
| small_entry = last; |
| } else { |
| entry = last; |
| min_total_size = total_size; |
| } |
| } |
| } |
| |
| if (entry == NULL) { |
| if (small_entry == NULL) |
| return -ENOSPC; |
| entry = small_entry; |
| } |
| |
| entry_size = EXT4_XATTR_LEN(entry->e_name_len); |
| total_size = entry_size; |
| if (!entry->e_value_inum) |
| total_size += EXT4_XATTR_SIZE( |
| le32_to_cpu(entry->e_value_size)); |
| error = ext4_xattr_move_to_block(handle, inode, raw_inode, |
| entry); |
| if (error) |
| return error; |
| |
| *total_ino -= entry_size; |
| ifree += total_size; |
| bfree -= total_size; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Expand an inode by new_extra_isize bytes when EAs are present. |
| * Returns 0 on success or negative error number on failure. |
| */ |
| int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, |
| struct ext4_inode *raw_inode, handle_t *handle) |
| { |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| static unsigned int mnt_count; |
| size_t min_offs; |
| size_t ifree, bfree; |
| int total_ino; |
| void *base, *end; |
| int error = 0, tried_min_extra_isize = 0; |
| int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); |
| int isize_diff; /* How much do we need to grow i_extra_isize */ |
| |
| retry: |
| isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; |
| if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) |
| return 0; |
| |
| header = IHDR(inode, raw_inode); |
| |
| /* |
| * Check if enough free space is available in the inode to shift the |
| * entries ahead by new_extra_isize. |
| */ |
| |
| base = IFIRST(header); |
| end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; |
| min_offs = end - base; |
| total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); |
| |
| error = xattr_check_inode(inode, header, end); |
| if (error) |
| goto cleanup; |
| |
| ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); |
| if (ifree >= isize_diff) |
| goto shift; |
| |
| /* |
| * Enough free space isn't available in the inode, check if |
| * EA block can hold new_extra_isize bytes. |
| */ |
| if (EXT4_I(inode)->i_file_acl) { |
| struct buffer_head *bh; |
| |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) { |
| error = PTR_ERR(bh); |
| goto cleanup; |
| } |
| error = ext4_xattr_check_block(inode, bh); |
| if (error) { |
| brelse(bh); |
| goto cleanup; |
| } |
| base = BHDR(bh); |
| end = bh->b_data + bh->b_size; |
| min_offs = end - base; |
| bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, |
| NULL); |
| brelse(bh); |
| if (bfree + ifree < isize_diff) { |
| if (!tried_min_extra_isize && s_min_extra_isize) { |
| tried_min_extra_isize++; |
| new_extra_isize = s_min_extra_isize; |
| goto retry; |
| } |
| error = -ENOSPC; |
| goto cleanup; |
| } |
| } else { |
| bfree = inode->i_sb->s_blocksize; |
| } |
| |
| error = ext4_xattr_make_inode_space(handle, inode, raw_inode, |
| isize_diff, ifree, bfree, |
| &total_ino); |
| if (error) { |
| if (error == -ENOSPC && !tried_min_extra_isize && |
| s_min_extra_isize) { |
| tried_min_extra_isize++; |
| new_extra_isize = s_min_extra_isize; |
| goto retry; |
| } |
| goto cleanup; |
| } |
| shift: |
| /* Adjust the offsets and shift the remaining entries ahead */ |
| ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize |
| - new_extra_isize, (void *)raw_inode + |
| EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, |
| (void *)header, total_ino); |
| EXT4_I(inode)->i_extra_isize = new_extra_isize; |
| |
| cleanup: |
| if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { |
| ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", |
| inode->i_ino); |
| mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); |
| } |
| return error; |
| } |
| |
| #define EIA_INCR 16 /* must be 2^n */ |
| #define EIA_MASK (EIA_INCR - 1) |
| |
| /* Add the large xattr @inode into @ea_inode_array for deferred iput(). |
| * If @ea_inode_array is new or full it will be grown and the old |
| * contents copied over. |
| */ |
| static int |
| ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, |
| struct inode *inode) |
| { |
| if (*ea_inode_array == NULL) { |
| /* |
| * Start with 15 inodes, so it fits into a power-of-two size. |
| * If *ea_inode_array is NULL, this is essentially offsetof() |
| */ |
| (*ea_inode_array) = |
| kmalloc(offsetof(struct ext4_xattr_inode_array, |
| inodes[EIA_MASK]), |
| GFP_NOFS); |
| if (*ea_inode_array == NULL) |
| return -ENOMEM; |
| (*ea_inode_array)->count = 0; |
| } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { |
| /* expand the array once all 15 + n * 16 slots are full */ |
| struct ext4_xattr_inode_array *new_array = NULL; |
| int count = (*ea_inode_array)->count; |
| |
| /* if new_array is NULL, this is essentially offsetof() */ |
| new_array = kmalloc( |
| offsetof(struct ext4_xattr_inode_array, |
| inodes[count + EIA_INCR]), |
| GFP_NOFS); |
| if (new_array == NULL) |
| return -ENOMEM; |
| memcpy(new_array, *ea_inode_array, |
| offsetof(struct ext4_xattr_inode_array, inodes[count])); |
| kfree(*ea_inode_array); |
| *ea_inode_array = new_array; |
| } |
| (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; |
| return 0; |
| } |
| |
| /* |
| * ext4_xattr_delete_inode() |
| * |
| * Free extended attribute resources associated with this inode. Traverse |
| * all entries and decrement reference on any xattr inodes associated with this |
| * inode. This is called immediately before an inode is freed. We have exclusive |
| * access to the inode. If an orphan inode is deleted it will also release its |
| * references on xattr block and xattr inodes. |
| */ |
| int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, |
| struct ext4_xattr_inode_array **ea_inode_array, |
| int extra_credits) |
| { |
| struct buffer_head *bh = NULL; |
| struct ext4_xattr_ibody_header *header; |
| struct ext4_iloc iloc = { .bh = NULL }; |
| struct ext4_xattr_entry *entry; |
| struct inode *ea_inode; |
| int error; |
| |
| error = ext4_xattr_ensure_credits(handle, inode, extra_credits, |
| NULL /* bh */, |
| false /* dirty */, |
| false /* block_csum */); |
| if (error) { |
| EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); |
| goto cleanup; |
| } |
| |
| if (ext4_has_feature_ea_inode(inode->i_sb) && |
| ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
| |
| error = ext4_get_inode_loc(inode, &iloc); |
| if (error) { |
| EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); |
| goto cleanup; |
| } |
| |
| error = ext4_journal_get_write_access(handle, iloc.bh); |
| if (error) { |
| EXT4_ERROR_INODE(inode, "write access (error %d)", |
| error); |
| goto cleanup; |
| } |
| |
| header = IHDR(inode, ext4_raw_inode(&iloc)); |
| if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) |
| ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, |
| IFIRST(header), |
| false /* block_csum */, |
| ea_inode_array, |
| extra_credits, |
| false /* skip_quota */); |
| } |
| |
| if (EXT4_I(inode)->i_file_acl) { |
| bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); |
| if (IS_ERR(bh)) { |
| error = PTR_ERR(bh); |
| if (error == -EIO) |
| EXT4_ERROR_INODE(inode, "block %llu read error", |
| EXT4_I(inode)->i_file_acl); |
| bh = NULL; |
| goto cleanup; |
| } |
| error = ext4_xattr_check_block(inode, bh); |
| if (error) |
| goto cleanup; |
| |
| if (ext4_has_feature_ea_inode(inode->i_sb)) { |
| for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); |
| entry = EXT4_XATTR_NEXT(entry)) { |
| if (!entry->e_value_inum) |
| continue; |
| error = ext4_xattr_inode_iget(inode, |
| le32_to_cpu(entry->e_value_inum), |
| le32_to_cpu(entry->e_hash), |
| &ea_inode); |
| if (error) |
| continue; |
| ext4_xattr_inode_free_quota(inode, ea_inode, |
| le32_to_cpu(entry->e_value_size)); |
| iput(ea_inode); |
| } |
| |
| } |
| |
| ext4_xattr_release_block(handle, inode, bh, ea_inode_array, |
| extra_credits); |
| /* |
| * Update i_file_acl value in the same transaction that releases |
| * block. |
| */ |
| EXT4_I(inode)->i_file_acl = 0; |
| error = ext4_mark_inode_dirty(handle, inode); |
| if (error) { |
| EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", |
| error); |
| goto cleanup; |
| } |
| } |
| error = 0; |
| cleanup: |
| brelse(iloc.bh); |
| brelse(bh); |
| return error; |
| } |
| |
| void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) |
| { |
| int idx; |
| |
| if (ea_inode_array == NULL) |
| return; |
| |
| for (idx = 0; idx < ea_inode_array->count; ++idx) |
| iput(ea_inode_array->inodes[idx]); |
| kfree(ea_inode_array); |
| } |
| |
| /* |
| * ext4_xattr_block_cache_insert() |
| * |
| * Create a new entry in the extended attribute block cache, and insert |
| * it unless such an entry is already in the cache. |
| * |
| * Returns 0, or a negative error number on failure. |
| */ |
| static void |
| ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, |
| struct buffer_head *bh) |
| { |
| struct ext4_xattr_header *header = BHDR(bh); |
| __u32 hash = le32_to_cpu(header->h_hash); |
| int reusable = le32_to_cpu(header->h_refcount) < |
| EXT4_XATTR_REFCOUNT_MAX; |
| int error; |
| |
| if (!ea_block_cache) |
| return; |
| error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, |
| bh->b_blocknr, reusable); |
| if (error) { |
| if (error == -EBUSY) |
| ea_bdebug(bh,
|