/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * xattr.c * * Copyright (C) 2004, 2008 Oracle. All rights reserved. * * CREDITS: * Lots of code in this file is copy from linux/fs/ext3/xattr.c. * Copyright (C) 2001-2003 Andreas Gruenbacher, * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MLOG_MASK_PREFIX ML_XATTR #include #include "ocfs2.h" #include "alloc.h" #include "dlmglue.h" #include "file.h" #include "symlink.h" #include "sysfile.h" #include "inode.h" #include "journal.h" #include "ocfs2_fs.h" #include "suballoc.h" #include "uptodate.h" #include "buffer_head_io.h" #include "super.h" #include "xattr.h" struct ocfs2_xattr_def_value_root { struct ocfs2_xattr_value_root xv; struct ocfs2_extent_rec er; }; struct ocfs2_xattr_bucket { /* The inode these xattrs are associated with */ struct inode *bu_inode; /* The actual buffers that make up the bucket */ struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET]; /* How many blocks make up one bucket for this filesystem */ int bu_blocks; }; #define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root)) #define OCFS2_XATTR_INLINE_SIZE 80 static struct ocfs2_xattr_def_value_root def_xv = { .xv.xr_list.l_count = cpu_to_le16(1), }; struct xattr_handler *ocfs2_xattr_handlers[] = { &ocfs2_xattr_user_handler, &ocfs2_xattr_trusted_handler, NULL }; static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = { [OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler, [OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler, }; struct ocfs2_xattr_info { int name_index; const char *name; const void *value; size_t value_len; }; struct ocfs2_xattr_search { struct buffer_head *inode_bh; /* * xattr_bh point to the block buffer head which has extended attribute * when extended attribute in inode, xattr_bh is equal to inode_bh. */ struct buffer_head *xattr_bh; struct ocfs2_xattr_header *header; struct ocfs2_xattr_bucket *bucket; void *base; void *end; struct ocfs2_xattr_entry *here; int not_found; }; static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, struct ocfs2_xattr_header *xh, int index, int *block_off, int *new_offset); static int ocfs2_xattr_block_find(struct inode *inode, int name_index, const char *name, struct ocfs2_xattr_search *xs); static int ocfs2_xattr_index_block_find(struct inode *inode, struct buffer_head *root_bh, int name_index, const char *name, struct ocfs2_xattr_search *xs); static int ocfs2_xattr_tree_list_index_block(struct inode *inode, struct ocfs2_xattr_tree_root *xt, char *buffer, size_t buffer_size); static int ocfs2_xattr_create_index_block(struct inode *inode, struct ocfs2_xattr_search *xs); static int ocfs2_xattr_set_entry_index_block(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs); static int ocfs2_delete_xattr_index_block(struct inode *inode, struct buffer_head *xb_bh); static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb) { return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE; } static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb) { return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits); } static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb) { u16 len = sb->s_blocksize - offsetof(struct ocfs2_xattr_header, xh_entries); return len / sizeof(struct ocfs2_xattr_entry); } #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr) #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data) #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0)) static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode) { struct ocfs2_xattr_bucket *bucket; int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb); BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET); bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS); if (bucket) { bucket->bu_inode = inode; bucket->bu_blocks = blks; } return bucket; } static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket) { int i; for (i = 0; i < bucket->bu_blocks; i++) { brelse(bucket->bu_bhs[i]); bucket->bu_bhs[i] = NULL; } } static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket) { if (bucket) { ocfs2_xattr_bucket_relse(bucket); bucket->bu_inode = NULL; kfree(bucket); } } /* * A bucket that has never been written to disk doesn't need to be * read. We just need the buffer_heads. Don't call this for * buckets that are already on disk. ocfs2_read_xattr_bucket() initializes * them fully. */ static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket, u64 xb_blkno) { int i, rc = 0; for (i = 0; i < bucket->bu_blocks; i++) { bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb, xb_blkno + i); if (!bucket->bu_bhs[i]) { rc = -EIO; mlog_errno(rc); break; } ocfs2_set_new_buffer_uptodate(bucket->bu_inode, bucket->bu_bhs[i]); } if (rc) ocfs2_xattr_bucket_relse(bucket); return rc; } /* Read the xattr bucket at xb_blkno */ static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket, u64 xb_blkno) { int rc; rc = ocfs2_read_blocks(bucket->bu_inode, xb_blkno, bucket->bu_blocks, bucket->bu_bhs, 0); if (rc) ocfs2_xattr_bucket_relse(bucket); return rc; } static int ocfs2_xattr_bucket_journal_access(handle_t *handle, struct ocfs2_xattr_bucket *bucket, int type) { int i, rc = 0; for (i = 0; i < bucket->bu_blocks; i++) { rc = ocfs2_journal_access(handle, bucket->bu_inode, bucket->bu_bhs[i], type); if (rc) { mlog_errno(rc); break; } } return rc; } static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle, struct ocfs2_xattr_bucket *bucket) { int i; for (i = 0; i < bucket->bu_blocks; i++) ocfs2_journal_dirty(handle, bucket->bu_bhs[i]); } static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest, struct ocfs2_xattr_bucket *src) { int i; int blocksize = src->bu_inode->i_sb->s_blocksize; BUG_ON(dest->bu_blocks != src->bu_blocks); BUG_ON(dest->bu_inode != src->bu_inode); for (i = 0; i < src->bu_blocks; i++) { memcpy(bucket_block(dest, i), bucket_block(src, i), blocksize); } } static inline const char *ocfs2_xattr_prefix(int name_index) { struct xattr_handler *handler = NULL; if (name_index > 0 && name_index < OCFS2_XATTR_MAX) handler = ocfs2_xattr_handler_map[name_index]; return handler ? handler->prefix : NULL; } static u32 ocfs2_xattr_name_hash(struct inode *inode, const char *name, int name_len) { /* Get hash value of uuid from super block */ u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash; int i; /* hash extended attribute name */ for (i = 0; i < name_len; i++) { hash = (hash << OCFS2_HASH_SHIFT) ^ (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^ *name++; } return hash; } /* * ocfs2_xattr_hash_entry() * * Compute the hash of an extended attribute. */ static void ocfs2_xattr_hash_entry(struct inode *inode, struct ocfs2_xattr_header *header, struct ocfs2_xattr_entry *entry) { u32 hash = 0; char *name = (char *)header + le16_to_cpu(entry->xe_name_offset); hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len); entry->xe_name_hash = cpu_to_le32(hash); return; } static int ocfs2_xattr_extend_allocation(struct inode *inode, u32 clusters_to_add, struct buffer_head *xattr_bh, struct ocfs2_xattr_value_root *xv) { int status = 0; int restart_func = 0; int credits = 0; handle_t *handle = NULL; struct ocfs2_alloc_context *data_ac = NULL; struct ocfs2_alloc_context *meta_ac = NULL; enum ocfs2_alloc_restarted why; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters); struct ocfs2_extent_tree et; mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add); ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv); restart_all: status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, &data_ac, &meta_ac); if (status) { mlog_errno(status); goto leave; } credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, clusters_to_add); handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { status = PTR_ERR(handle); handle = NULL; mlog_errno(status); goto leave; } restarted_transaction: status = ocfs2_journal_access(handle, inode, xattr_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); goto leave; } prev_clusters = le32_to_cpu(xv->xr_clusters); status = ocfs2_add_clusters_in_btree(osb, inode, &logical_start, clusters_to_add, 0, &et, handle, data_ac, meta_ac, &why); if ((status < 0) && (status != -EAGAIN)) { if (status != -ENOSPC) mlog_errno(status); goto leave; } status = ocfs2_journal_dirty(handle, xattr_bh); if (status < 0) { mlog_errno(status); goto leave; } clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters; if (why != RESTART_NONE && clusters_to_add) { if (why == RESTART_META) { mlog(0, "restarting function.\n"); restart_func = 1; } else { BUG_ON(why != RESTART_TRANS); mlog(0, "restarting transaction.\n"); /* TODO: This can be more intelligent. */ credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, clusters_to_add); status = ocfs2_extend_trans(handle, credits); if (status < 0) { /* handle still has to be committed at * this point. */ status = -ENOMEM; mlog_errno(status); goto leave; } goto restarted_transaction; } } leave: if (handle) { ocfs2_commit_trans(osb, handle); handle = NULL; } if (data_ac) { ocfs2_free_alloc_context(data_ac); data_ac = NULL; } if (meta_ac) { ocfs2_free_alloc_context(meta_ac); meta_ac = NULL; } if ((!status) && restart_func) { restart_func = 0; goto restart_all; } return status; } static int __ocfs2_remove_xattr_range(struct inode *inode, struct buffer_head *root_bh, struct ocfs2_xattr_value_root *xv, u32 cpos, u32 phys_cpos, u32 len, struct ocfs2_cached_dealloc_ctxt *dealloc) { int ret; u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct inode *tl_inode = osb->osb_tl_inode; handle_t *handle; struct ocfs2_alloc_context *meta_ac = NULL; struct ocfs2_extent_tree et; ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv); ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); if (ret) { mlog_errno(ret); return ret; } mutex_lock(&tl_inode->i_mutex); if (ocfs2_truncate_log_needs_flush(osb)) { ret = __ocfs2_flush_truncate_log(osb); if (ret < 0) { mlog_errno(ret); goto out; } } handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, root_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, dealloc); if (ret) { mlog_errno(ret); goto out_commit; } le32_add_cpu(&xv->xr_clusters, -len); ret = ocfs2_journal_dirty(handle, root_bh); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len); if (ret) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); out: mutex_unlock(&tl_inode->i_mutex); if (meta_ac) ocfs2_free_alloc_context(meta_ac); return ret; } static int ocfs2_xattr_shrink_size(struct inode *inode, u32 old_clusters, u32 new_clusters, struct buffer_head *root_bh, struct ocfs2_xattr_value_root *xv) { int ret = 0; u32 trunc_len, cpos, phys_cpos, alloc_size; u64 block; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_cached_dealloc_ctxt dealloc; ocfs2_init_dealloc_ctxt(&dealloc); if (old_clusters <= new_clusters) return 0; cpos = new_clusters; trunc_len = old_clusters - new_clusters; while (trunc_len) { ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos, &alloc_size, &xv->xr_list); if (ret) { mlog_errno(ret); goto out; } if (alloc_size > trunc_len) alloc_size = trunc_len; ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos, phys_cpos, alloc_size, &dealloc); if (ret) { mlog_errno(ret); goto out; } block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); ocfs2_remove_xattr_clusters_from_cache(inode, block, alloc_size); cpos += alloc_size; trunc_len -= alloc_size; } out: ocfs2_schedule_truncate_log_flush(osb, 1); ocfs2_run_deallocs(osb, &dealloc); return ret; } static int ocfs2_xattr_value_truncate(struct inode *inode, struct buffer_head *root_bh, struct ocfs2_xattr_value_root *xv, int len) { int ret; u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len); u32 old_clusters = le32_to_cpu(xv->xr_clusters); if (new_clusters == old_clusters) return 0; if (new_clusters > old_clusters) ret = ocfs2_xattr_extend_allocation(inode, new_clusters - old_clusters, root_bh, xv); else ret = ocfs2_xattr_shrink_size(inode, old_clusters, new_clusters, root_bh, xv); return ret; } static int ocfs2_xattr_list_entry(char *buffer, size_t size, size_t *result, const char *prefix, const char *name, int name_len) { char *p = buffer + *result; int prefix_len = strlen(prefix); int total_len = prefix_len + name_len + 1; *result += total_len; /* we are just looking for how big our buffer needs to be */ if (!size) return 0; if (*result > size) return -ERANGE; memcpy(p, prefix, prefix_len); memcpy(p + prefix_len, name, name_len); p[prefix_len + name_len] = '\0'; return 0; } static int ocfs2_xattr_list_entries(struct inode *inode, struct ocfs2_xattr_header *header, char *buffer, size_t buffer_size) { size_t result = 0; int i, type, ret; const char *prefix, *name; for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; type = ocfs2_xattr_get_type(entry); prefix = ocfs2_xattr_prefix(type); if (prefix) { name = (const char *)header + le16_to_cpu(entry->xe_name_offset); ret = ocfs2_xattr_list_entry(buffer, buffer_size, &result, prefix, name, entry->xe_name_len); if (ret) return ret; } } return result; } static int ocfs2_xattr_ibody_list(struct inode *inode, struct ocfs2_dinode *di, char *buffer, size_t buffer_size) { struct ocfs2_xattr_header *header = NULL; struct ocfs2_inode_info *oi = OCFS2_I(inode); int ret = 0; if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) return ret; header = (struct ocfs2_xattr_header *) ((void *)di + inode->i_sb->s_blocksize - le16_to_cpu(di->i_xattr_inline_size)); ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); return ret; } static int ocfs2_xattr_block_list(struct inode *inode, struct ocfs2_dinode *di, char *buffer, size_t buffer_size) { struct buffer_head *blk_bh = NULL; struct ocfs2_xattr_block *xb; int ret = 0; if (!di->i_xattr_loc) return ret; ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh); if (ret < 0) { mlog_errno(ret); return ret; } xb = (struct ocfs2_xattr_block *)blk_bh->b_data; if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { ret = -EIO; goto cleanup; } if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header; ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size); } else { struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root; ret = ocfs2_xattr_tree_list_index_block(inode, xt, buffer, buffer_size); } cleanup: brelse(blk_bh); return ret; } ssize_t ocfs2_listxattr(struct dentry *dentry, char *buffer, size_t size) { int ret = 0, i_ret = 0, b_ret = 0; struct buffer_head *di_bh = NULL; struct ocfs2_dinode *di = NULL; struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode); if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb))) return -EOPNOTSUPP; if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) return ret; ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0); if (ret < 0) { mlog_errno(ret); return ret; } di = (struct ocfs2_dinode *)di_bh->b_data; down_read(&oi->ip_xattr_sem); i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size); if (i_ret < 0) b_ret = 0; else { if (buffer) { buffer += i_ret; size -= i_ret; } b_ret = ocfs2_xattr_block_list(dentry->d_inode, di, buffer, size); if (b_ret < 0) i_ret = 0; } up_read(&oi->ip_xattr_sem); ocfs2_inode_unlock(dentry->d_inode, 0); brelse(di_bh); return i_ret + b_ret; } static int ocfs2_xattr_find_entry(int name_index, const char *name, struct ocfs2_xattr_search *xs) { struct ocfs2_xattr_entry *entry; size_t name_len; int i, cmp = 1; if (name == NULL) return -EINVAL; name_len = strlen(name); entry = xs->here; for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) { cmp = name_index - ocfs2_xattr_get_type(entry); if (!cmp) cmp = name_len - entry->xe_name_len; if (!cmp) cmp = memcmp(name, (xs->base + le16_to_cpu(entry->xe_name_offset)), name_len); if (cmp == 0) break; entry += 1; } xs->here = entry; return cmp ? -ENODATA : 0; } static int ocfs2_xattr_get_value_outside(struct inode *inode, struct ocfs2_xattr_value_root *xv, void *buffer, size_t len) { u32 cpos, p_cluster, num_clusters, bpc, clusters; u64 blkno; int i, ret = 0; size_t cplen, blocksize; struct buffer_head *bh = NULL; struct ocfs2_extent_list *el; el = &xv->xr_list; clusters = le32_to_cpu(xv->xr_clusters); bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); blocksize = inode->i_sb->s_blocksize; cpos = 0; while (cpos < clusters) { ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, &num_clusters, el); if (ret) { mlog_errno(ret); goto out; } blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); /* Copy ocfs2_xattr_value */ for (i = 0; i < num_clusters * bpc; i++, blkno++) { ret = ocfs2_read_block(inode, blkno, &bh); if (ret) { mlog_errno(ret); goto out; } cplen = len >= blocksize ? blocksize : len; memcpy(buffer, bh->b_data, cplen); len -= cplen; buffer += cplen; brelse(bh); bh = NULL; if (len == 0) break; } cpos += num_clusters; } out: return ret; } static int ocfs2_xattr_ibody_get(struct inode *inode, int name_index, const char *name, void *buffer, size_t buffer_size, struct ocfs2_xattr_search *xs) { struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; struct ocfs2_xattr_value_root *xv; size_t size; int ret = 0; if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) return -ENODATA; xs->end = (void *)di + inode->i_sb->s_blocksize; xs->header = (struct ocfs2_xattr_header *) (xs->end - le16_to_cpu(di->i_xattr_inline_size)); xs->base = (void *)xs->header; xs->here = xs->header->xh_entries; ret = ocfs2_xattr_find_entry(name_index, name, xs); if (ret) return ret; size = le64_to_cpu(xs->here->xe_value_size); if (buffer) { if (size > buffer_size) return -ERANGE; if (ocfs2_xattr_is_local(xs->here)) { memcpy(buffer, (void *)xs->base + le16_to_cpu(xs->here->xe_name_offset) + OCFS2_XATTR_SIZE(xs->here->xe_name_len), size); } else { xv = (struct ocfs2_xattr_value_root *) (xs->base + le16_to_cpu( xs->here->xe_name_offset) + OCFS2_XATTR_SIZE(xs->here->xe_name_len)); ret = ocfs2_xattr_get_value_outside(inode, xv, buffer, size); if (ret < 0) { mlog_errno(ret); return ret; } } } return size; } static int ocfs2_xattr_block_get(struct inode *inode, int name_index, const char *name, void *buffer, size_t buffer_size, struct ocfs2_xattr_search *xs) { struct ocfs2_xattr_block *xb; struct ocfs2_xattr_value_root *xv; size_t size; int ret = -ENODATA, name_offset, name_len, block_off, i; xs->bucket = ocfs2_xattr_bucket_new(inode); if (!xs->bucket) { ret = -ENOMEM; mlog_errno(ret); goto cleanup; } ret = ocfs2_xattr_block_find(inode, name_index, name, xs); if (ret) { mlog_errno(ret); goto cleanup; } if (xs->not_found) { ret = -ENODATA; goto cleanup; } xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; size = le64_to_cpu(xs->here->xe_value_size); if (buffer) { ret = -ERANGE; if (size > buffer_size) goto cleanup; name_offset = le16_to_cpu(xs->here->xe_name_offset); name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len); i = xs->here - xs->header->xh_entries; if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) { ret = ocfs2_xattr_bucket_get_name_value(inode, bucket_xh(xs->bucket), i, &block_off, &name_offset); xs->base = bucket_block(xs->bucket, block_off); } if (ocfs2_xattr_is_local(xs->here)) { memcpy(buffer, (void *)xs->base + name_offset + name_len, size); } else { xv = (struct ocfs2_xattr_value_root *) (xs->base + name_offset + name_len); ret = ocfs2_xattr_get_value_outside(inode, xv, buffer, size); if (ret < 0) { mlog_errno(ret); goto cleanup; } } } ret = size; cleanup: ocfs2_xattr_bucket_free(xs->bucket); brelse(xs->xattr_bh); xs->xattr_bh = NULL; return ret; } /* ocfs2_xattr_get() * * Copy an extended attribute into the buffer provided. * Buffer is NULL to compute the size of buffer required. */ static int ocfs2_xattr_get(struct inode *inode, int name_index, const char *name, void *buffer, size_t buffer_size) { int ret; struct ocfs2_dinode *di = NULL; struct buffer_head *di_bh = NULL; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_xattr_search xis = { .not_found = -ENODATA, }; struct ocfs2_xattr_search xbs = { .not_found = -ENODATA, }; if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) return -EOPNOTSUPP; if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) ret = -ENODATA; ret = ocfs2_inode_lock(inode, &di_bh, 0); if (ret < 0) { mlog_errno(ret); return ret; } xis.inode_bh = xbs.inode_bh = di_bh; di = (struct ocfs2_dinode *)di_bh->b_data; down_read(&oi->ip_xattr_sem); ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer, buffer_size, &xis); if (ret == -ENODATA && di->i_xattr_loc) ret = ocfs2_xattr_block_get(inode, name_index, name, buffer, buffer_size, &xbs); up_read(&oi->ip_xattr_sem); ocfs2_inode_unlock(inode, 0); brelse(di_bh); return ret; } static int __ocfs2_xattr_set_value_outside(struct inode *inode, struct ocfs2_xattr_value_root *xv, const void *value, int value_len) { int ret = 0, i, cp_len, credits; u16 blocksize = inode->i_sb->s_blocksize; u32 p_cluster, num_clusters; u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len); u64 blkno; struct buffer_head *bh = NULL; handle_t *handle; BUG_ON(clusters > le32_to_cpu(xv->xr_clusters)); credits = clusters * bpc; handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } while (cpos < clusters) { ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster, &num_clusters, &xv->xr_list); if (ret) { mlog_errno(ret); goto out_commit; } blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster); for (i = 0; i < num_clusters * bpc; i++, blkno++) { ret = ocfs2_read_block(inode, blkno, &bh); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_journal_access(handle, inode, bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out_commit; } cp_len = value_len > blocksize ? blocksize : value_len; memcpy(bh->b_data, value, cp_len); value_len -= cp_len; value += cp_len; if (cp_len < blocksize) memset(bh->b_data + cp_len, 0, blocksize - cp_len); ret = ocfs2_journal_dirty(handle, bh); if (ret < 0) { mlog_errno(ret); goto out_commit; } brelse(bh); bh = NULL; /* * XXX: do we need to empty all the following * blocks in this cluster? */ if (!value_len) break; } cpos += num_clusters; } out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out: brelse(bh); return ret; } static int ocfs2_xattr_cleanup(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, size_t offs) { handle_t *handle = NULL; int ret = 0; size_t name_len = strlen(xi->name); void *val = xs->base + offs; size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), OCFS2_XATTR_BLOCK_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } /* Decrease xattr count */ le16_add_cpu(&xs->header->xh_count, -1); /* Remove the xattr entry and tree root which has already be set*/ memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry)); memset(val, 0, size); ret = ocfs2_journal_dirty(handle, xs->xattr_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out: return ret; } static int ocfs2_xattr_update_entry(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, size_t offs) { handle_t *handle = NULL; int ret = 0; handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), OCFS2_XATTR_BLOCK_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } xs->here->xe_name_offset = cpu_to_le16(offs); xs->here->xe_value_size = cpu_to_le64(xi->value_len); if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE) ocfs2_xattr_set_local(xs->here, 1); else ocfs2_xattr_set_local(xs->here, 0); ocfs2_xattr_hash_entry(inode, xs->header, xs->here); ret = ocfs2_journal_dirty(handle, xs->xattr_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out: return ret; } /* * ocfs2_xattr_set_value_outside() * * Set large size value in B tree. */ static int ocfs2_xattr_set_value_outside(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, size_t offs) { size_t name_len = strlen(xi->name); void *val = xs->base + offs; struct ocfs2_xattr_value_root *xv = NULL; size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; int ret = 0; memset(val, 0, size); memcpy(val, xi->name, name_len); xv = (struct ocfs2_xattr_value_root *) (val + OCFS2_XATTR_SIZE(name_len)); xv->xr_clusters = 0; xv->xr_last_eb_blk = 0; xv->xr_list.l_tree_depth = 0; xv->xr_list.l_count = cpu_to_le16(1); xv->xr_list.l_next_free_rec = 0; ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, xi->value_len); if (ret < 0) { mlog_errno(ret); return ret; } ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, xi->value_len); if (ret < 0) { mlog_errno(ret); return ret; } ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); if (ret < 0) mlog_errno(ret); return ret; } /* * ocfs2_xattr_set_entry_local() * * Set, replace or remove extended attribute in local. */ static void ocfs2_xattr_set_entry_local(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, struct ocfs2_xattr_entry *last, size_t min_offs) { size_t name_len = strlen(xi->name); int i; if (xi->value && xs->not_found) { /* Insert the new xattr entry. */ le16_add_cpu(&xs->header->xh_count, 1); ocfs2_xattr_set_type(last, xi->name_index); ocfs2_xattr_set_local(last, 1); last->xe_name_len = name_len; } else { void *first_val; void *val; size_t offs, size; first_val = xs->base + min_offs; offs = le16_to_cpu(xs->here->xe_name_offset); val = xs->base + offs; if (le64_to_cpu(xs->here->xe_value_size) > OCFS2_XATTR_INLINE_SIZE) size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; else size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); if (xi->value && size == OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len)) { /* The old and the new value have the same size. Just replace the value. */ ocfs2_xattr_set_local(xs->here, 1); xs->here->xe_value_size = cpu_to_le64(xi->value_len); /* Clear value bytes. */ memset(val + OCFS2_XATTR_SIZE(name_len), 0, OCFS2_XATTR_SIZE(xi->value_len)); memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); return; } /* Remove the old name+value. */ memmove(first_val + size, first_val, val - first_val); memset(first_val, 0, size); xs->here->xe_name_hash = 0; xs->here->xe_name_offset = 0; ocfs2_xattr_set_local(xs->here, 1); xs->here->xe_value_size = 0; min_offs += size; /* Adjust all value offsets. */ last = xs->header->xh_entries; for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { size_t o = le16_to_cpu(last->xe_name_offset); if (o < offs) last->xe_name_offset = cpu_to_le16(o + size); last += 1; } if (!xi->value) { /* Remove the old entry. */ last -= 1; memmove(xs->here, xs->here + 1, (void *)last - (void *)xs->here); memset(last, 0, sizeof(struct ocfs2_xattr_entry)); le16_add_cpu(&xs->header->xh_count, -1); } } if (xi->value) { /* Insert the new name+value. */ size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); void *val = xs->base + min_offs - size; xs->here->xe_name_offset = cpu_to_le16(min_offs - size); memset(val, 0, size); memcpy(val, xi->name, name_len); memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); xs->here->xe_value_size = cpu_to_le64(xi->value_len); ocfs2_xattr_set_local(xs->here, 1); ocfs2_xattr_hash_entry(inode, xs->header, xs->here); } return; } /* * ocfs2_xattr_set_entry() * * Set extended attribute entry into inode or block. * * If extended attribute value size > OCFS2_XATTR_INLINE_SIZE, * We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(), * then set value in B tree with set_value_outside(). */ static int ocfs2_xattr_set_entry(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, int flag) { struct ocfs2_xattr_entry *last; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name); size_t size_l = 0; handle_t *handle = NULL; int free, i, ret; struct ocfs2_xattr_info xi_l = { .name_index = xi->name_index, .name = xi->name, .value = xi->value, .value_len = xi->value_len, }; /* Compute min_offs, last and free space. */ last = xs->header->xh_entries; for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) { size_t offs = le16_to_cpu(last->xe_name_offset); if (offs < min_offs) min_offs = offs; last += 1; } free = min_offs - ((void *)last - xs->base) - sizeof(__u32); if (free < 0) return -EIO; if (!xs->not_found) { size_t size = 0; if (ocfs2_xattr_is_local(xs->here)) size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); else size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; free += (size + sizeof(struct ocfs2_xattr_entry)); } /* Check free space in inode or block */ if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { if (free < sizeof(struct ocfs2_xattr_entry) + OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE) { ret = -ENOSPC; goto out; } size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE; xi_l.value = (void *)&def_xv; xi_l.value_len = OCFS2_XATTR_ROOT_SIZE; } else if (xi->value) { if (free < sizeof(struct ocfs2_xattr_entry) + OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len)) { ret = -ENOSPC; goto out; } } if (!xs->not_found) { /* For existing extended attribute */ size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size)); size_t offs = le16_to_cpu(xs->here->xe_name_offset); void *val = xs->base + offs; if (ocfs2_xattr_is_local(xs->here) && size == size_l) { /* Replace existing local xattr with tree root */ ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); if (ret < 0) mlog_errno(ret); goto out; } else if (!ocfs2_xattr_is_local(xs->here)) { /* For existing xattr which has value outside */ struct ocfs2_xattr_value_root *xv = NULL; xv = (struct ocfs2_xattr_value_root *)(val + OCFS2_XATTR_SIZE(name_len)); if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) { /* * If new value need set outside also, * first truncate old value to new value, * then set new value with set_value_outside(). */ ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, xi->value_len); if (ret < 0) { mlog_errno(ret); goto out; } ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value, xi->value_len); if (ret < 0) { mlog_errno(ret); goto out; } ret = ocfs2_xattr_update_entry(inode, xi, xs, offs); if (ret < 0) mlog_errno(ret); goto out; } else { /* * If new value need set in local, * just trucate old value to zero. */ ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv, 0); if (ret < 0) mlog_errno(ret); } } } handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, xs->inode_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } if (!(flag & OCFS2_INLINE_XATTR_FL)) { /* set extended attribute in external block. */ ret = ocfs2_extend_trans(handle, OCFS2_INODE_UPDATE_CREDITS + OCFS2_XATTR_BLOCK_UPDATE_CREDITS); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_journal_access(handle, inode, xs->xattr_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } } /* * Set value in local, include set tree root in local. * This is the first step for value size >INLINE_SIZE. */ ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs); if (!(flag & OCFS2_INLINE_XATTR_FL)) { ret = ocfs2_journal_dirty(handle, xs->xattr_bh); if (ret < 0) { mlog_errno(ret); goto out_commit; } } if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) && (flag & OCFS2_INLINE_XATTR_FL)) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); unsigned int xattrsize = osb->s_xattr_inline_size; /* * Adjust extent record count or inline data size * to reserve space for extended attribute. */ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { struct ocfs2_inline_data *idata = &di->id2.i_data; le16_add_cpu(&idata->id_count, -xattrsize); } else if (!(ocfs2_inode_is_fast_symlink(inode))) { struct ocfs2_extent_list *el = &di->id2.i_list; le16_add_cpu(&el->l_count, -(xattrsize / sizeof(struct ocfs2_extent_rec))); } di->i_xattr_inline_size = cpu_to_le16(xattrsize); } /* Update xattr flag */ spin_lock(&oi->ip_lock); oi->ip_dyn_features |= flag; di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); spin_unlock(&oi->ip_lock); /* Update inode ctime */ inode->i_ctime = CURRENT_TIME; di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); ret = ocfs2_journal_dirty(handle, xs->inode_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) { /* * Set value outside in B tree. * This is the second step for value size > INLINE_SIZE. */ size_t offs = le16_to_cpu(xs->here->xe_name_offset); ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs); if (ret < 0) { int ret2; mlog_errno(ret); /* * If set value outside failed, we have to clean * the junk tree root we have already set in local. */ ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs); if (ret2 < 0) mlog_errno(ret2); } } out: return ret; } static int ocfs2_remove_value_outside(struct inode*inode, struct buffer_head *bh, struct ocfs2_xattr_header *header) { int ret = 0, i; for (i = 0; i < le16_to_cpu(header->xh_count); i++) { struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; if (!ocfs2_xattr_is_local(entry)) { struct ocfs2_xattr_value_root *xv; void *val; val = (void *)header + le16_to_cpu(entry->xe_name_offset); xv = (struct ocfs2_xattr_value_root *) (val + OCFS2_XATTR_SIZE(entry->xe_name_len)); ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0); if (ret < 0) { mlog_errno(ret); return ret; } } } return ret; } static int ocfs2_xattr_ibody_remove(struct inode *inode, struct buffer_head *di_bh) { struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; struct ocfs2_xattr_header *header; int ret; header = (struct ocfs2_xattr_header *) ((void *)di + inode->i_sb->s_blocksize - le16_to_cpu(di->i_xattr_inline_size)); ret = ocfs2_remove_value_outside(inode, di_bh, header); return ret; } static int ocfs2_xattr_block_remove(struct inode *inode, struct buffer_head *blk_bh) { struct ocfs2_xattr_block *xb; int ret = 0; xb = (struct ocfs2_xattr_block *)blk_bh->b_data; if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header); ret = ocfs2_remove_value_outside(inode, blk_bh, header); } else ret = ocfs2_delete_xattr_index_block(inode, blk_bh); return ret; } static int ocfs2_xattr_free_block(struct inode *inode, u64 block) { struct inode *xb_alloc_inode; struct buffer_head *xb_alloc_bh = NULL; struct buffer_head *blk_bh = NULL; struct ocfs2_xattr_block *xb; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); handle_t *handle; int ret = 0; u64 blk, bg_blkno; u16 bit; ret = ocfs2_read_block(inode, block, &blk_bh); if (ret < 0) { mlog_errno(ret); goto out; } xb = (struct ocfs2_xattr_block *)blk_bh->b_data; if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { ret = -EIO; goto out; } ret = ocfs2_xattr_block_remove(inode, blk_bh); if (ret < 0) { mlog_errno(ret); goto out; } blk = le64_to_cpu(xb->xb_blkno); bit = le16_to_cpu(xb->xb_suballoc_bit); bg_blkno = ocfs2_which_suballoc_group(blk, bit); xb_alloc_inode = ocfs2_get_system_file_inode(osb, EXTENT_ALLOC_SYSTEM_INODE, le16_to_cpu(xb->xb_suballoc_slot)); if (!xb_alloc_inode) { ret = -ENOMEM; mlog_errno(ret); goto out; } mutex_lock(&xb_alloc_inode->i_mutex); ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1); if (ret < 0) { mlog_errno(ret); goto out_mutex; } handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_unlock; } ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh, bit, bg_blkno, 1); if (ret < 0) mlog_errno(ret); ocfs2_commit_trans(osb, handle); out_unlock: ocfs2_inode_unlock(xb_alloc_inode, 1); brelse(xb_alloc_bh); out_mutex: mutex_unlock(&xb_alloc_inode->i_mutex); iput(xb_alloc_inode); out: brelse(blk_bh); return ret; } /* * ocfs2_xattr_remove() * * Free extended attribute resources associated with this inode. */ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh) { struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; handle_t *handle; int ret; if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) return 0; if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) return 0; if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { ret = ocfs2_xattr_ibody_remove(inode, di_bh); if (ret < 0) { mlog_errno(ret); goto out; } } if (di->i_xattr_loc) { ret = ocfs2_xattr_free_block(inode, le64_to_cpu(di->i_xattr_loc)); if (ret < 0) { mlog_errno(ret); goto out; } } handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } di->i_xattr_loc = 0; spin_lock(&oi->ip_lock); oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL); di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); spin_unlock(&oi->ip_lock); ret = ocfs2_journal_dirty(handle, di_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out: return ret; } static int ocfs2_xattr_has_space_inline(struct inode *inode, struct ocfs2_dinode *di) { struct ocfs2_inode_info *oi = OCFS2_I(inode); unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size; int free; if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE) return 0; if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { struct ocfs2_inline_data *idata = &di->id2.i_data; free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size); } else if (ocfs2_inode_is_fast_symlink(inode)) { free = ocfs2_fast_symlink_chars(inode->i_sb) - le64_to_cpu(di->i_size); } else { struct ocfs2_extent_list *el = &di->id2.i_list; free = (le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec)) * sizeof(struct ocfs2_extent_rec); } if (free >= xattrsize) return 1; return 0; } /* * ocfs2_xattr_ibody_find() * * Find extended attribute in inode block and * fill search info into struct ocfs2_xattr_search. */ static int ocfs2_xattr_ibody_find(struct inode *inode, int name_index, const char *name, struct ocfs2_xattr_search *xs) { struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; int ret; int has_space = 0; if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) return 0; if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { down_read(&oi->ip_alloc_sem); has_space = ocfs2_xattr_has_space_inline(inode, di); up_read(&oi->ip_alloc_sem); if (!has_space) return 0; } xs->xattr_bh = xs->inode_bh; xs->end = (void *)di + inode->i_sb->s_blocksize; if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) xs->header = (struct ocfs2_xattr_header *) (xs->end - le16_to_cpu(di->i_xattr_inline_size)); else xs->header = (struct ocfs2_xattr_header *) (xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size); xs->base = (void *)xs->header; xs->here = xs->header->xh_entries; /* Find the named attribute. */ if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) { ret = ocfs2_xattr_find_entry(name_index, name, xs); if (ret && ret != -ENODATA) return ret; xs->not_found = ret; } return 0; } /* * ocfs2_xattr_ibody_set() * * Set, replace or remove an extended attribute into inode block. * */ static int ocfs2_xattr_ibody_set(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs) { struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; int ret; if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) return -ENOSPC; down_write(&oi->ip_alloc_sem); if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) { if (!ocfs2_xattr_has_space_inline(inode, di)) { ret = -ENOSPC; goto out; } } ret = ocfs2_xattr_set_entry(inode, xi, xs, (OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL)); out: up_write(&oi->ip_alloc_sem); return ret; } /* * ocfs2_xattr_block_find() * * Find extended attribute in external block and * fill search info into struct ocfs2_xattr_search. */ static int ocfs2_xattr_block_find(struct inode *inode, int name_index, const char *name, struct ocfs2_xattr_search *xs) { struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; struct buffer_head *blk_bh = NULL; struct ocfs2_xattr_block *xb; int ret = 0; if (!di->i_xattr_loc) return ret; ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh); if (ret < 0) { mlog_errno(ret); return ret; } xb = (struct ocfs2_xattr_block *)blk_bh->b_data; if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) { ret = -EIO; goto cleanup; } xs->xattr_bh = blk_bh; if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) { xs->header = &xb->xb_attrs.xb_header; xs->base = (void *)xs->header; xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size; xs->here = xs->header->xh_entries; ret = ocfs2_xattr_find_entry(name_index, name, xs); } else ret = ocfs2_xattr_index_block_find(inode, blk_bh, name_index, name, xs); if (ret && ret != -ENODATA) { xs->xattr_bh = NULL; goto cleanup; } xs->not_found = ret; return 0; cleanup: brelse(blk_bh); return ret; } /* * ocfs2_xattr_block_set() * * Set, replace or remove an extended attribute into external block. * */ static int ocfs2_xattr_block_set(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs) { struct buffer_head *new_bh = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data; struct ocfs2_alloc_context *meta_ac = NULL; handle_t *handle = NULL; struct ocfs2_xattr_block *xblk = NULL; u16 suballoc_bit_start; u32 num_got; u64 first_blkno; int ret; if (!xs->xattr_bh) { /* * Alloc one external block for extended attribute * outside of inode. */ ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); if (ret < 0) { mlog_errno(ret); goto out; } handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, xs->inode_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret < 0) { mlog_errno(ret); goto out_commit; } ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1, &suballoc_bit_start, &num_got, &first_blkno); if (ret < 0) { mlog_errno(ret); goto out_commit; } new_bh = sb_getblk(inode->i_sb, first_blkno); ocfs2_set_new_buffer_uptodate(inode, new_bh); ret = ocfs2_journal_access(handle, inode, new_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret < 0) { mlog_errno(ret); goto out_commit; } /* Initialize ocfs2_xattr_block */ xs->xattr_bh = new_bh; xblk = (struct ocfs2_xattr_block *)new_bh->b_data; memset(xblk, 0, inode->i_sb->s_blocksize); strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE); xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num); xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start); xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation); xblk->xb_blkno = cpu_to_le64(first_blkno); xs->header = &xblk->xb_attrs.xb_header; xs->base = (void *)xs->header; xs->end = (void *)xblk + inode->i_sb->s_blocksize; xs->here = xs->header->xh_entries; ret = ocfs2_journal_dirty(handle, new_bh); if (ret < 0) { mlog_errno(ret); goto out_commit; } di->i_xattr_loc = cpu_to_le64(first_blkno); ret = ocfs2_journal_dirty(handle, xs->inode_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); out: if (meta_ac) ocfs2_free_alloc_context(meta_ac); if (ret < 0) return ret; } else xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data; if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) { /* Set extended attribute into external block */ ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL); if (!ret || ret != -ENOSPC) goto end; ret = ocfs2_xattr_create_index_block(inode, xs); if (ret) goto end; } ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs); end: return ret; } /* * ocfs2_xattr_set() * * Set, replace or remove an extended attribute for this inode. * value is NULL to remove an existing extended attribute, else either * create or replace an extended attribute. */ int ocfs2_xattr_set(struct inode *inode, int name_index, const char *name, const void *value, size_t value_len, int flags) { struct buffer_head *di_bh = NULL; struct ocfs2_dinode *di; int ret; struct ocfs2_xattr_info xi = { .name_index = name_index, .name = name, .value = value, .value_len = value_len, }; struct ocfs2_xattr_search xis = { .not_found = -ENODATA, }; struct ocfs2_xattr_search xbs = { .not_found = -ENODATA, }; if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb))) return -EOPNOTSUPP; /* * Only xbs will be used on indexed trees. xis doesn't need a * bucket. */ xbs.bucket = ocfs2_xattr_bucket_new(inode); if (!xbs.bucket) { mlog_errno(-ENOMEM); return -ENOMEM; } ret = ocfs2_inode_lock(inode, &di_bh, 1); if (ret < 0) { mlog_errno(ret); goto cleanup_nolock; } xis.inode_bh = xbs.inode_bh = di_bh; di = (struct ocfs2_dinode *)di_bh->b_data; down_write(&OCFS2_I(inode)->ip_xattr_sem); /* * Scan inode and external block to find the same name * extended attribute and collect search infomation. */ ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis); if (ret) goto cleanup; if (xis.not_found) { ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); if (ret) goto cleanup; } if (xis.not_found && xbs.not_found) { ret = -ENODATA; if (flags & XATTR_REPLACE) goto cleanup; ret = 0; if (!value) goto cleanup; } else { ret = -EEXIST; if (flags & XATTR_CREATE) goto cleanup; } if (!value) { /* Remove existing extended attribute */ if (!xis.not_found) ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); else if (!xbs.not_found) ret = ocfs2_xattr_block_set(inode, &xi, &xbs); } else { /* We always try to set extended attribute into inode first*/ ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); if (!ret && !xbs.not_found) { /* * If succeed and that extended attribute existing in * external block, then we will remove it. */ xi.value = NULL; xi.value_len = 0; ret = ocfs2_xattr_block_set(inode, &xi, &xbs); } else if (ret == -ENOSPC) { if (di->i_xattr_loc && !xbs.xattr_bh) { ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs); if (ret) goto cleanup; } /* * If no space in inode, we will set extended attribute * into external block. */ ret = ocfs2_xattr_block_set(inode, &xi, &xbs); if (ret) goto cleanup; if (!xis.not_found) { /* * If succeed and that extended attribute * existing in inode, we will remove it. */ xi.value = NULL; xi.value_len = 0; ret = ocfs2_xattr_ibody_set(inode, &xi, &xis); } } } cleanup: up_write(&OCFS2_I(inode)->ip_xattr_sem); ocfs2_inode_unlock(inode, 1); cleanup_nolock: brelse(di_bh); brelse(xbs.xattr_bh); ocfs2_xattr_bucket_free(xbs.bucket); return ret; } /* * Find the xattr extent rec which may contains name_hash. * e_cpos will be the first name hash of the xattr rec. * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list. */ static int ocfs2_xattr_get_rec(struct inode *inode, u32 name_hash, u64 *p_blkno, u32 *e_cpos, u32 *num_clusters, struct ocfs2_extent_list *el) { int ret = 0, i; struct buffer_head *eb_bh = NULL; struct ocfs2_extent_block *eb; struct ocfs2_extent_rec *rec = NULL; u64 e_blkno = 0; if (el->l_tree_depth) { ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh); if (ret) { mlog_errno(ret); goto out; } eb = (struct ocfs2_extent_block *) eb_bh->b_data; el = &eb->h_list; if (el->l_tree_depth) { ocfs2_error(inode->i_sb, "Inode %lu has non zero tree depth in " "xattr tree block %llu\n", inode->i_ino, (unsigned long long)eb_bh->b_blocknr); ret = -EROFS; goto out; } } for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { rec = &el->l_recs[i]; if (le32_to_cpu(rec->e_cpos) <= name_hash) { e_blkno = le64_to_cpu(rec->e_blkno); break; } } if (!e_blkno) { ocfs2_error(inode->i_sb, "Inode %lu has bad extent " "record (%u, %u, 0) in xattr", inode->i_ino, le32_to_cpu(rec->e_cpos), ocfs2_rec_clusters(el, rec)); ret = -EROFS; goto out; } *p_blkno = le64_to_cpu(rec->e_blkno); *num_clusters = le16_to_cpu(rec->e_leaf_clusters); if (e_cpos) *e_cpos = le32_to_cpu(rec->e_cpos); out: brelse(eb_bh); return ret; } typedef int (xattr_bucket_func)(struct inode *inode, struct ocfs2_xattr_bucket *bucket, void *para); static int ocfs2_find_xe_in_bucket(struct inode *inode, struct ocfs2_xattr_bucket *bucket, int name_index, const char *name, u32 name_hash, u16 *xe_index, int *found) { int i, ret = 0, cmp = 1, block_off, new_offset; struct ocfs2_xattr_header *xh = bucket_xh(bucket); size_t name_len = strlen(name); struct ocfs2_xattr_entry *xe = NULL; char *xe_name; /* * We don't use binary search in the bucket because there * may be multiple entries with the same name hash. */ for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { xe = &xh->xh_entries[i]; if (name_hash > le32_to_cpu(xe->xe_name_hash)) continue; else if (name_hash < le32_to_cpu(xe->xe_name_hash)) break; cmp = name_index - ocfs2_xattr_get_type(xe); if (!cmp) cmp = name_len - xe->xe_name_len; if (cmp) continue; ret = ocfs2_xattr_bucket_get_name_value(inode, xh, i, &block_off, &new_offset); if (ret) { mlog_errno(ret); break; } xe_name = bucket_block(bucket, block_off) + new_offset; if (!memcmp(name, xe_name, name_len)) { *xe_index = i; *found = 1; ret = 0; break; } } return ret; } /* * Find the specified xattr entry in a series of buckets. * This series start from p_blkno and last for num_clusters. * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains * the num of the valid buckets. * * Return the buffer_head this xattr should reside in. And if the xattr's * hash is in the gap of 2 buckets, return the lower bucket. */ static int ocfs2_xattr_bucket_find(struct inode *inode, int name_index, const char *name, u32 name_hash, u64 p_blkno, u32 first_hash, u32 num_clusters, struct ocfs2_xattr_search *xs) { int ret, found = 0; struct ocfs2_xattr_header *xh = NULL; struct ocfs2_xattr_entry *xe = NULL; u16 index = 0; u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); int low_bucket = 0, bucket, high_bucket; struct ocfs2_xattr_bucket *search; u32 last_hash; u64 blkno, lower_blkno = 0; search = ocfs2_xattr_bucket_new(inode); if (!search) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_read_xattr_bucket(search, p_blkno); if (ret) { mlog_errno(ret); goto out; } xh = bucket_xh(search); high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1; while (low_bucket <= high_bucket) { ocfs2_xattr_bucket_relse(search); bucket = (low_bucket + high_bucket) / 2; blkno = p_blkno + bucket * blk_per_bucket; ret = ocfs2_read_xattr_bucket(search, blkno); if (ret) { mlog_errno(ret); goto out; } xh = bucket_xh(search); xe = &xh->xh_entries[0]; if (name_hash < le32_to_cpu(xe->xe_name_hash)) { high_bucket = bucket - 1; continue; } /* * Check whether the hash of the last entry in our * bucket is larger than the search one. for an empty * bucket, the last one is also the first one. */ if (xh->xh_count) xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1]; last_hash = le32_to_cpu(xe->xe_name_hash); /* record lower_blkno which may be the insert place. */ lower_blkno = blkno; if (name_hash > le32_to_cpu(xe->xe_name_hash)) { low_bucket = bucket + 1; continue; } /* the searched xattr should reside in this bucket if exists. */ ret = ocfs2_find_xe_in_bucket(inode, search, name_index, name, name_hash, &index, &found); if (ret) { mlog_errno(ret); goto out; } break; } /* * Record the bucket we have found. * When the xattr's hash value is in the gap of 2 buckets, we will * always set it to the previous bucket. */ if (!lower_blkno) lower_blkno = p_blkno; /* This should be in cache - we just read it during the search */ ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno); if (ret) { mlog_errno(ret); goto out; } xs->header = bucket_xh(xs->bucket); xs->base = bucket_block(xs->bucket, 0); xs->end = xs->base + inode->i_sb->s_blocksize; if (found) { xs->here = &xs->header->xh_entries[index]; mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name, (unsigned long long)bucket_blkno(xs->bucket), index); } else ret = -ENODATA; out: ocfs2_xattr_bucket_free(search); return ret; } static int ocfs2_xattr_index_block_find(struct inode *inode, struct buffer_head *root_bh, int name_index, const char *name, struct ocfs2_xattr_search *xs) { int ret; struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)root_bh->b_data; struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; struct ocfs2_extent_list *el = &xb_root->xt_list; u64 p_blkno = 0; u32 first_hash, num_clusters = 0; u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name)); if (le16_to_cpu(el->l_next_free_rec) == 0) return -ENODATA; mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n", name, name_hash, name_index); ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash, &num_clusters, el); if (ret) { mlog_errno(ret); goto out; } BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash); mlog(0, "find xattr extent rec %u clusters from %llu, the first hash " "in the rec is %u\n", num_clusters, (unsigned long long)p_blkno, first_hash); ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash, p_blkno, first_hash, num_clusters, xs); out: return ret; } static int ocfs2_iterate_xattr_buckets(struct inode *inode, u64 blkno, u32 clusters, xattr_bucket_func *func, void *para) { int i, ret = 0; u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)); u32 num_buckets = clusters * bpc; struct ocfs2_xattr_bucket *bucket; bucket = ocfs2_xattr_bucket_new(inode); if (!bucket) { mlog_errno(-ENOMEM); return -ENOMEM; } mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n", clusters, (unsigned long long)blkno); for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) { ret = ocfs2_read_xattr_bucket(bucket, blkno); if (ret) { mlog_errno(ret); break; } /* * The real bucket num in this series of blocks is stored * in the 1st bucket. */ if (i == 0) num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets); mlog(0, "iterating xattr bucket %llu, first hash %u\n", (unsigned long long)blkno, le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash)); if (func) { ret = func(inode, bucket, para); if (ret) mlog_errno(ret); /* Fall through to bucket_relse() */ } ocfs2_xattr_bucket_relse(bucket); if (ret) break; } ocfs2_xattr_bucket_free(bucket); return ret; } struct ocfs2_xattr_tree_list { char *buffer; size_t buffer_size; size_t result; }; static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, struct ocfs2_xattr_header *xh, int index, int *block_off, int *new_offset) { u16 name_offset; if (index < 0 || index >= le16_to_cpu(xh->xh_count)) return -EINVAL; name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset); *block_off = name_offset >> inode->i_sb->s_blocksize_bits; *new_offset = name_offset % inode->i_sb->s_blocksize; return 0; } static int ocfs2_list_xattr_bucket(struct inode *inode, struct ocfs2_xattr_bucket *bucket, void *para) { int ret = 0, type; struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; int i, block_off, new_offset; const char *prefix, *name; for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) { struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i]; type = ocfs2_xattr_get_type(entry); prefix = ocfs2_xattr_prefix(type); if (prefix) { ret = ocfs2_xattr_bucket_get_name_value(inode, bucket_xh(bucket), i, &block_off, &new_offset); if (ret) break; name = (const char *)bucket_block(bucket, block_off) + new_offset; ret = ocfs2_xattr_list_entry(xl->buffer, xl->buffer_size, &xl->result, prefix, name, entry->xe_name_len); if (ret) break; } } return ret; } static int ocfs2_xattr_tree_list_index_block(struct inode *inode, struct ocfs2_xattr_tree_root *xt, char *buffer, size_t buffer_size) { struct ocfs2_extent_list *el = &xt->xt_list; int ret = 0; u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0; u64 p_blkno = 0; struct ocfs2_xattr_tree_list xl = { .buffer = buffer, .buffer_size = buffer_size, .result = 0, }; if (le16_to_cpu(el->l_next_free_rec) == 0) return 0; while (name_hash > 0) { ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, &num_clusters, el); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, ocfs2_list_xattr_bucket, &xl); if (ret) { mlog_errno(ret); goto out; } if (e_cpos == 0) break; name_hash = e_cpos - 1; } ret = xl.result; out: return ret; } static int cmp_xe(const void *a, const void *b) { const struct ocfs2_xattr_entry *l = a, *r = b; u32 l_hash = le32_to_cpu(l->xe_name_hash); u32 r_hash = le32_to_cpu(r->xe_name_hash); if (l_hash > r_hash) return 1; if (l_hash < r_hash) return -1; return 0; } static void swap_xe(void *a, void *b, int size) { struct ocfs2_xattr_entry *l = a, *r = b, tmp; tmp = *l; memcpy(l, r, sizeof(struct ocfs2_xattr_entry)); memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry)); } /* * When the ocfs2_xattr_block is filled up, new bucket will be created * and all the xattr entries will be moved to the new bucket. * Note: we need to sort the entries since they are not saved in order * in the ocfs2_xattr_block. */ static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode, struct buffer_head *xb_bh, struct buffer_head *xh_bh, struct buffer_head *data_bh) { int i, blocksize = inode->i_sb->s_blocksize; u16 offset, size, off_change; struct ocfs2_xattr_entry *xe; struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)xb_bh->b_data; struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header; struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xh_bh->b_data; u16 count = le16_to_cpu(xb_xh->xh_count); char *target = xh_bh->b_data, *src = xb_bh->b_data; mlog(0, "cp xattr from block %llu to bucket %llu\n", (unsigned long long)xb_bh->b_blocknr, (unsigned long long)xh_bh->b_blocknr); memset(xh_bh->b_data, 0, blocksize); if (data_bh) memset(data_bh->b_data, 0, blocksize); /* * Since the xe_name_offset is based on ocfs2_xattr_header, * there is a offset change corresponding to the change of * ocfs2_xattr_header's position. */ off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); xe = &xb_xh->xh_entries[count - 1]; offset = le16_to_cpu(xe->xe_name_offset) + off_change; size = blocksize - offset; /* copy all the names and values. */ if (data_bh) target = data_bh->b_data; memcpy(target + offset, src + offset, size); /* Init new header now. */ xh->xh_count = xb_xh->xh_count; xh->xh_num_buckets = cpu_to_le16(1); xh->xh_name_value_len = cpu_to_le16(size); xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size); /* copy all the entries. */ target = xh_bh->b_data; offset = offsetof(struct ocfs2_xattr_header, xh_entries); size = count * sizeof(struct ocfs2_xattr_entry); memcpy(target + offset, (char *)xb_xh + offset, size); /* Change the xe offset for all the xe because of the move. */ off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize + offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header); for (i = 0; i < count; i++) le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change); mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n", offset, size, off_change); sort(target + offset, count, sizeof(struct ocfs2_xattr_entry), cmp_xe, swap_xe); } /* * After we move xattr from block to index btree, we have to * update ocfs2_xattr_search to the new xe and base. * * When the entry is in xattr block, xattr_bh indicates the storage place. * While if the entry is in index b-tree, "bucket" indicates the * real place of the xattr. */ static int ocfs2_xattr_update_xattr_search(struct inode *inode, struct ocfs2_xattr_search *xs, struct buffer_head *old_bh, struct buffer_head *new_bh) { int ret = 0; char *buf = old_bh->b_data; struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf; struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header; int i, blocksize = inode->i_sb->s_blocksize; u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); xs->bucket->bu_bhs[0] = new_bh; get_bh(new_bh); xs->header = bucket_xh(xs->bucket); xs->base = new_bh->b_data; xs->end = xs->base + inode->i_sb->s_blocksize; if (!xs->not_found) { if (OCFS2_XATTR_BUCKET_SIZE != blocksize) { ret = ocfs2_read_blocks(inode, bucket_blkno(xs->bucket) + 1, blk_per_bucket - 1, &xs->bucket->bu_bhs[1], 0); if (ret) { mlog_errno(ret); return ret; } } i = xs->here - old_xh->xh_entries; xs->here = &xs->header->xh_entries[i]; } return ret; } static int ocfs2_xattr_create_index_block(struct inode *inode, struct ocfs2_xattr_search *xs) { int ret, credits = OCFS2_SUBALLOC_ALLOC; u32 bit_off, len; u64 blkno; handle_t *handle; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_alloc_context *data_ac; struct buffer_head *xh_bh = NULL, *data_bh = NULL; struct buffer_head *xb_bh = xs->xattr_bh; struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)xb_bh->b_data; struct ocfs2_xattr_tree_root *xr; u16 xb_flags = le16_to_cpu(xb->xb_flags); u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb); mlog(0, "create xattr index block for %llu\n", (unsigned long long)xb_bh->b_blocknr); BUG_ON(xb_flags & OCFS2_XATTR_INDEXED); ret = ocfs2_reserve_clusters(osb, 1, &data_ac); if (ret) { mlog_errno(ret); goto out; } /* * XXX: * We can use this lock for now, and maybe move to a dedicated mutex * if performance becomes a problem later. */ down_write(&oi->ip_alloc_sem); /* * 3 more credits, one for xattr block update, one for the 1st block * of the new xattr bucket and one for the value/data. */ credits += 3; handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_sem; } ret = ocfs2_journal_access(handle, inode, xb_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len); if (ret) { mlog_errno(ret); goto out_commit; } /* * The bucket may spread in many blocks, and * we will only touch the 1st block and the last block * in the whole bucket(one for entry and one for data). */ blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off); mlog(0, "allocate 1 cluster from %llu to xattr block\n", (unsigned long long)blkno); xh_bh = sb_getblk(inode->i_sb, blkno); if (!xh_bh) { ret = -EIO; mlog_errno(ret); goto out_commit; } ocfs2_set_new_buffer_uptodate(inode, xh_bh); ret = ocfs2_journal_access(handle, inode, xh_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret) { mlog_errno(ret); goto out_commit; } if (bpb > 1) { data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1); if (!data_bh) { ret = -EIO; mlog_errno(ret); goto out_commit; } ocfs2_set_new_buffer_uptodate(inode, data_bh); ret = ocfs2_journal_access(handle, inode, data_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret) { mlog_errno(ret); goto out_commit; } } ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh); ocfs2_journal_dirty(handle, xh_bh); if (data_bh) ocfs2_journal_dirty(handle, data_bh); ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh); if (ret) { mlog_errno(ret); goto out_commit; } /* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */ memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize - offsetof(struct ocfs2_xattr_block, xb_attrs)); xr = &xb->xb_attrs.xb_root; xr->xt_clusters = cpu_to_le32(1); xr->xt_last_eb_blk = 0; xr->xt_list.l_tree_depth = 0; xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb)); xr->xt_list.l_next_free_rec = cpu_to_le16(1); xr->xt_list.l_recs[0].e_cpos = 0; xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno); xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1); xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED); ret = ocfs2_journal_dirty(handle, xb_bh); if (ret) { mlog_errno(ret); goto out_commit; } out_commit: ocfs2_commit_trans(osb, handle); out_sem: up_write(&oi->ip_alloc_sem); out: if (data_ac) ocfs2_free_alloc_context(data_ac); brelse(xh_bh); brelse(data_bh); return ret; } static int cmp_xe_offset(const void *a, const void *b) { const struct ocfs2_xattr_entry *l = a, *r = b; u32 l_name_offset = le16_to_cpu(l->xe_name_offset); u32 r_name_offset = le16_to_cpu(r->xe_name_offset); if (l_name_offset < r_name_offset) return 1; if (l_name_offset > r_name_offset) return -1; return 0; } /* * defrag a xattr bucket if we find that the bucket has some * holes beteen name/value pairs. * We will move all the name/value pairs to the end of the bucket * so that we can spare some space for insertion. */ static int ocfs2_defrag_xattr_bucket(struct inode *inode, struct ocfs2_xattr_bucket *bucket) { int ret, i; size_t end, offset, len, value_len; struct ocfs2_xattr_header *xh; char *entries, *buf, *bucket_buf = NULL; u64 blkno = bucket_blkno(bucket); u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); u16 xh_free_start; size_t blocksize = inode->i_sb->s_blocksize; handle_t *handle; struct buffer_head **bhs; struct ocfs2_xattr_entry *xe; bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket, GFP_NOFS); if (!bhs) return -ENOMEM; ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0); if (ret) goto out; /* * In order to make the operation more efficient and generic, * we copy all the blocks into a contiguous memory and do the * defragment there, so if anything is error, we will not touch * the real block. */ bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS); if (!bucket_buf) { ret = -EIO; goto out; } buf = bucket_buf; for (i = 0; i < blk_per_bucket; i++, buf += blocksize) memcpy(buf, bhs[i]->b_data, blocksize); handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket); if (IS_ERR(handle)) { ret = PTR_ERR(handle); handle = NULL; mlog_errno(ret); goto out; } for (i = 0; i < blk_per_bucket; i++) { ret = ocfs2_journal_access(handle, inode, bhs[i], OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto commit; } } xh = (struct ocfs2_xattr_header *)bucket_buf; entries = (char *)xh->xh_entries; xh_free_start = le16_to_cpu(xh->xh_free_start); mlog(0, "adjust xattr bucket in %llu, count = %u, " "xh_free_start = %u, xh_name_value_len = %u.\n", (unsigned long long)blkno, le16_to_cpu(xh->xh_count), xh_free_start, le16_to_cpu(xh->xh_name_value_len)); /* * sort all the entries by their offset. * the largest will be the first, so that we can * move them to the end one by one. */ sort(entries, le16_to_cpu(xh->xh_count), sizeof(struct ocfs2_xattr_entry), cmp_xe_offset, swap_xe); /* Move all name/values to the end of the bucket. */ xe = xh->xh_entries; end = OCFS2_XATTR_BUCKET_SIZE; for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) { offset = le16_to_cpu(xe->xe_name_offset); if (ocfs2_xattr_is_local(xe)) value_len = OCFS2_XATTR_SIZE( le64_to_cpu(xe->xe_value_size)); else value_len = OCFS2_XATTR_ROOT_SIZE; len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len; /* * We must make sure that the name/value pair * exist in the same block. So adjust end to * the previous block end if needed. */ if (((end - len) / blocksize != (end - 1) / blocksize)) end = end - end % blocksize; if (end > offset + len) { memmove(bucket_buf + end - len, bucket_buf + offset, len); xe->xe_name_offset = cpu_to_le16(end - len); } mlog_bug_on_msg(end < offset + len, "Defrag check failed for " "bucket %llu\n", (unsigned long long)blkno); end -= len; } mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for " "bucket %llu\n", (unsigned long long)blkno); if (xh_free_start == end) goto commit; memset(bucket_buf + xh_free_start, 0, end - xh_free_start); xh->xh_free_start = cpu_to_le16(end); /* sort the entries by their name_hash. */ sort(entries, le16_to_cpu(xh->xh_count), sizeof(struct ocfs2_xattr_entry), cmp_xe, swap_xe); buf = bucket_buf; for (i = 0; i < blk_per_bucket; i++, buf += blocksize) { memcpy(bhs[i]->b_data, buf, blocksize); ocfs2_journal_dirty(handle, bhs[i]); } commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); out: if (bhs) { for (i = 0; i < blk_per_bucket; i++) brelse(bhs[i]); } kfree(bhs); kfree(bucket_buf); return ret; } /* * Move half nums of the xattr bucket in the previous cluster to this new * cluster. We only touch the last cluster of the previous extend record. * * first_bh is the first buffer_head of a series of bucket in the same * extent rec and header_bh is the header of one bucket in this cluster. * They will be updated if we move the data header_bh contains to the new * cluster. first_hash will be set as the 1st xe's name_hash of the new cluster. */ static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode, handle_t *handle, struct buffer_head **first_bh, struct buffer_head **header_bh, u64 new_blkno, u64 prev_blkno, u32 num_clusters, u32 *first_hash) { int i, ret, credits; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); int blocksize = inode->i_sb->s_blocksize; struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL; struct ocfs2_xattr_header *new_xh; struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)((*first_bh)->b_data); BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets); BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize); prev_bh = *first_bh; get_bh(prev_bh); xh = (struct ocfs2_xattr_header *)prev_bh->b_data; prev_blkno += (num_clusters - 1) * bpc + bpc / 2; mlog(0, "move half of xattrs in cluster %llu to %llu\n", (unsigned long long)prev_blkno, (unsigned long long)new_blkno); /* * We need to update the 1st half of the new cluster and * 1 more for the update of the 1st bucket of the previous * extent record. */ credits = bpc / 2 + 1; ret = ocfs2_extend_trans(handle, credits); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, prev_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) { old_bh = new_bh = NULL; new_bh = sb_getblk(inode->i_sb, new_blkno); if (!new_bh) { ret = -EIO; mlog_errno(ret); goto out; } ocfs2_set_new_buffer_uptodate(inode, new_bh); ret = ocfs2_journal_access(handle, inode, new_bh, OCFS2_JOURNAL_ACCESS_CREATE); if (ret < 0) { mlog_errno(ret); brelse(new_bh); goto out; } ret = ocfs2_read_block(inode, prev_blkno, &old_bh); if (ret < 0) { mlog_errno(ret); brelse(new_bh); goto out; } memcpy(new_bh->b_data, old_bh->b_data, blocksize); if (i == 0) { new_xh = (struct ocfs2_xattr_header *)new_bh->b_data; new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2); if (first_hash) *first_hash = le32_to_cpu( new_xh->xh_entries[0].xe_name_hash); new_first_bh = new_bh; get_bh(new_first_bh); } ocfs2_journal_dirty(handle, new_bh); if (*header_bh == old_bh) { brelse(*header_bh); *header_bh = new_bh; get_bh(*header_bh); brelse(*first_bh); *first_bh = new_first_bh; get_bh(*first_bh); } brelse(new_bh); brelse(old_bh); } le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2)); ocfs2_journal_dirty(handle, prev_bh); out: brelse(prev_bh); brelse(new_first_bh); return ret; } /* * Find the suitable pos when we divide a bucket into 2. * We have to make sure the xattrs with the same hash value exist * in the same bucket. * * If this ocfs2_xattr_header covers more than one hash value, find a * place where the hash value changes. Try to find the most even split. * The most common case is that all entries have different hash values, * and the first check we make will find a place to split. */ static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh) { struct ocfs2_xattr_entry *entries = xh->xh_entries; int count = le16_to_cpu(xh->xh_count); int delta, middle = count / 2; /* * We start at the middle. Each step gets farther away in both * directions. We therefore hit the change in hash value * nearest to the middle. Note that this loop does not execute for * count < 2. */ for (delta = 0; delta < middle; delta++) { /* Let's check delta earlier than middle */ if (cmp_xe(&entries[middle - delta - 1], &entries[middle - delta])) return middle - delta; /* For even counts, don't walk off the end */ if ((middle + delta + 1) == count) continue; /* Now try delta past middle */ if (cmp_xe(&entries[middle + delta], &entries[middle + delta + 1])) return middle + delta + 1; } /* Every entry had the same hash */ return count; } /* * Move some xattrs in old bucket(blk) to new bucket(new_blk). * first_hash will record the 1st hash of the new bucket. * * Normally half of the xattrs will be moved. But we have to make * sure that the xattrs with the same hash value are stored in the * same bucket. If all the xattrs in this bucket have the same hash * value, the new bucket will be initialized as an empty one and the * first_hash will be initialized as (hash_value+1). */ static int ocfs2_divide_xattr_bucket(struct inode *inode, handle_t *handle, u64 blk, u64 new_blk, u32 *first_hash, int new_bucket_head) { int ret, i; int count, start, len, name_value_len = 0, xe_len, name_offset = 0; struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL; struct ocfs2_xattr_header *xh; struct ocfs2_xattr_entry *xe; int blocksize = inode->i_sb->s_blocksize; mlog(0, "move some of xattrs from bucket %llu to %llu\n", (unsigned long long)blk, (unsigned long long)new_blk); s_bucket = ocfs2_xattr_bucket_new(inode); t_bucket = ocfs2_xattr_bucket_new(inode); if (!s_bucket || !t_bucket) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_read_xattr_bucket(s_bucket, blk); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } /* * Even if !new_bucket_head, we're overwriting t_bucket. Thus, * there's no need to read it. */ ret = ocfs2_init_xattr_bucket(t_bucket, new_blk); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket, new_bucket_head ? OCFS2_JOURNAL_ACCESS_CREATE : OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } xh = bucket_xh(s_bucket); count = le16_to_cpu(xh->xh_count); start = ocfs2_xattr_find_divide_pos(xh); if (start == count) { xe = &xh->xh_entries[start-1]; /* * initialized a new empty bucket here. * The hash value is set as one larger than * that of the last entry in the previous bucket. */ for (i = 0; i < t_bucket->bu_blocks; i++) memset(bucket_block(t_bucket, i), 0, blocksize); xh = bucket_xh(t_bucket); xh->xh_free_start = cpu_to_le16(blocksize); xh->xh_entries[0].xe_name_hash = xe->xe_name_hash; le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1); goto set_num_buckets; } /* copy the whole bucket to the new first. */ ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket); /* update the new bucket. */ xh = bucket_xh(t_bucket); /* * Calculate the total name/value len and xh_free_start for * the old bucket first. */ name_offset = OCFS2_XATTR_BUCKET_SIZE; name_value_len = 0; for (i = 0; i < start; i++) { xe = &xh->xh_entries[i]; xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); if (ocfs2_xattr_is_local(xe)) xe_len += OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); else xe_len += OCFS2_XATTR_ROOT_SIZE; name_value_len += xe_len; if (le16_to_cpu(xe->xe_name_offset) < name_offset) name_offset = le16_to_cpu(xe->xe_name_offset); } /* * Now begin the modification to the new bucket. * * In the new bucket, We just move the xattr entry to the beginning * and don't touch the name/value. So there will be some holes in the * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is * called. */ xe = &xh->xh_entries[start]; len = sizeof(struct ocfs2_xattr_entry) * (count - start); mlog(0, "mv xattr entry len %d from %d to %d\n", len, (int)((char *)xe - (char *)xh), (int)((char *)xh->xh_entries - (char *)xh)); memmove((char *)xh->xh_entries, (char *)xe, len); xe = &xh->xh_entries[count - start]; len = sizeof(struct ocfs2_xattr_entry) * start; memset((char *)xe, 0, len); le16_add_cpu(&xh->xh_count, -start); le16_add_cpu(&xh->xh_name_value_len, -name_value_len); /* Calculate xh_free_start for the new bucket. */ xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { xe = &xh->xh_entries[i]; xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len); if (ocfs2_xattr_is_local(xe)) xe_len += OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); else xe_len += OCFS2_XATTR_ROOT_SIZE; if (le16_to_cpu(xe->xe_name_offset) < le16_to_cpu(xh->xh_free_start)) xh->xh_free_start = xe->xe_name_offset; } set_num_buckets: /* set xh->xh_num_buckets for the new xh. */ if (new_bucket_head) xh->xh_num_buckets = cpu_to_le16(1); else xh->xh_num_buckets = 0; ocfs2_xattr_bucket_journal_dirty(handle, t_bucket); /* store the first_hash of the new bucket. */ if (first_hash) *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); /* * Now only update the 1st block of the old bucket. If we * just added a new empty bucket, there is no need to modify * it. */ if (start == count) goto out; xh = bucket_xh(s_bucket); memset(&xh->xh_entries[start], 0, sizeof(struct ocfs2_xattr_entry) * (count - start)); xh->xh_count = cpu_to_le16(start); xh->xh_free_start = cpu_to_le16(name_offset); xh->xh_name_value_len = cpu_to_le16(name_value_len); ocfs2_xattr_bucket_journal_dirty(handle, s_bucket); out: ocfs2_xattr_bucket_free(s_bucket); ocfs2_xattr_bucket_free(t_bucket); return ret; } /* * Copy xattr from one bucket to another bucket. * * The caller must make sure that the journal transaction * has enough space for journaling. */ static int ocfs2_cp_xattr_bucket(struct inode *inode, handle_t *handle, u64 s_blkno, u64 t_blkno, int t_is_new) { int ret; struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL; BUG_ON(s_blkno == t_blkno); mlog(0, "cp bucket %llu to %llu, target is %d\n", (unsigned long long)s_blkno, (unsigned long long)t_blkno, t_is_new); s_bucket = ocfs2_xattr_bucket_new(inode); t_bucket = ocfs2_xattr_bucket_new(inode); if (!s_bucket || !t_bucket) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno); if (ret) goto out; /* * Even if !t_is_new, we're overwriting t_bucket. Thus, * there's no need to read it. */ ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno); if (ret) goto out; ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket, t_is_new ? OCFS2_JOURNAL_ACCESS_CREATE : OCFS2_JOURNAL_ACCESS_WRITE); if (ret) goto out; ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket); ocfs2_xattr_bucket_journal_dirty(handle, t_bucket); out: ocfs2_xattr_bucket_free(t_bucket); ocfs2_xattr_bucket_free(s_bucket); return ret; } /* * Copy one xattr cluster from src_blk to to_blk. * The to_blk will become the first bucket header of the cluster, so its * xh_num_buckets will be initialized as the bucket num in the cluster. */ static int ocfs2_cp_xattr_cluster(struct inode *inode, handle_t *handle, struct buffer_head *first_bh, u64 src_blk, u64 to_blk, u32 *first_hash) { int i, ret, credits; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); int num_buckets = ocfs2_xattr_buckets_per_cluster(osb); struct buffer_head *bh = NULL; struct ocfs2_xattr_header *xh; u64 to_blk_start = to_blk; mlog(0, "cp xattrs from cluster %llu to %llu\n", (unsigned long long)src_blk, (unsigned long long)to_blk); /* * We need to update the new cluster and 1 more for the update of * the 1st bucket of the previous extent rec. */ credits = bpc + 1; ret = ocfs2_extend_trans(handle, credits); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, first_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } for (i = 0; i < num_buckets; i++) { ret = ocfs2_cp_xattr_bucket(inode, handle, src_blk, to_blk, 1); if (ret) { mlog_errno(ret); goto out; } src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb); } /* update the old bucket header. */ xh = (struct ocfs2_xattr_header *)first_bh->b_data; le16_add_cpu(&xh->xh_num_buckets, -num_buckets); ocfs2_journal_dirty(handle, first_bh); /* update the new bucket header. */ ret = ocfs2_read_block(inode, to_blk_start, &bh); if (ret < 0) { mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } xh = (struct ocfs2_xattr_header *)bh->b_data; xh->xh_num_buckets = cpu_to_le16(num_buckets); ocfs2_journal_dirty(handle, bh); if (first_hash) *first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); out: brelse(bh); return ret; } /* * Move some xattrs in this cluster to the new cluster. * This function should only be called when bucket size == cluster size. * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead. */ static int ocfs2_divide_xattr_cluster(struct inode *inode, handle_t *handle, u64 prev_blk, u64 new_blk, u32 *first_hash) { u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); int ret, credits = 2 * blk_per_bucket; BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize); ret = ocfs2_extend_trans(handle, credits); if (ret) { mlog_errno(ret); return ret; } /* Move half of the xattr in start_blk to the next bucket. */ return ocfs2_divide_xattr_bucket(inode, handle, prev_blk, new_blk, first_hash, 1); } /* * Move some xattrs from the old cluster to the new one since they are not * contiguous in ocfs2 xattr tree. * * new_blk starts a new separate cluster, and we will move some xattrs from * prev_blk to it. v_start will be set as the first name hash value in this * new cluster so that it can be used as e_cpos during tree insertion and * don't collide with our original b-tree operations. first_bh and header_bh * will also be updated since they will be used in ocfs2_extend_xattr_bucket * to extend the insert bucket. * * The problem is how much xattr should we move to the new one and when should * we update first_bh and header_bh? * 1. If cluster size > bucket size, that means the previous cluster has more * than 1 bucket, so just move half nums of bucket into the new cluster and * update the first_bh and header_bh if the insert bucket has been moved * to the new cluster. * 2. If cluster_size == bucket_size: * a) If the previous extent rec has more than one cluster and the insert * place isn't in the last cluster, copy the entire last cluster to the * new one. This time, we don't need to upate the first_bh and header_bh * since they will not be moved into the new cluster. * b) Otherwise, move the bottom half of the xattrs in the last cluster into * the new one. And we set the extend flag to zero if the insert place is * moved into the new allocated cluster since no extend is needed. */ static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode, handle_t *handle, struct buffer_head **first_bh, struct buffer_head **header_bh, u64 new_blk, u64 prev_blk, u32 prev_clusters, u32 *v_start, int *extend) { int ret = 0; int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n", (unsigned long long)prev_blk, prev_clusters, (unsigned long long)new_blk); if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) ret = ocfs2_mv_xattr_bucket_cross_cluster(inode, handle, first_bh, header_bh, new_blk, prev_blk, prev_clusters, v_start); else { u64 last_blk = prev_blk + bpc * (prev_clusters - 1); if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk) ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh, last_blk, new_blk, v_start); else { ret = ocfs2_divide_xattr_cluster(inode, handle, last_blk, new_blk, v_start); if ((*header_bh)->b_blocknr == last_blk && extend) *extend = 0; } } return ret; } /* * Add a new cluster for xattr storage. * * If the new cluster is contiguous with the previous one, it will be * appended to the same extent record, and num_clusters will be updated. * If not, we will insert a new extent for it and move some xattrs in * the last cluster into the new allocated one. * We also need to limit the maximum size of a btree leaf, otherwise we'll * lose the benefits of hashing because we'll have to search large leaves. * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize, * if it's bigger). * * first_bh is the first block of the previous extent rec and header_bh * indicates the bucket we will insert the new xattrs. They will be updated * when the header_bh is moved into the new cluster. */ static int ocfs2_add_new_xattr_cluster(struct inode *inode, struct buffer_head *root_bh, struct buffer_head **first_bh, struct buffer_head **header_bh, u32 *num_clusters, u32 prev_cpos, u64 prev_blkno, int *extend) { int ret, credits; u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); u32 prev_clusters = *num_clusters; u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0; u64 block; handle_t *handle = NULL; struct ocfs2_alloc_context *data_ac = NULL; struct ocfs2_alloc_context *meta_ac = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_extent_tree et; mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, " "previous xattr blkno = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, prev_cpos, (unsigned long long)prev_blkno); ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, &data_ac, &meta_ac); if (ret) { mlog_errno(ret); goto leave; } credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el, clusters_to_add); handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); handle = NULL; mlog_errno(ret); goto leave; } ret = ocfs2_journal_access(handle, inode, root_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto leave; } ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1, clusters_to_add, &bit_off, &num_bits); if (ret < 0) { if (ret != -ENOSPC) mlog_errno(ret); goto leave; } BUG_ON(num_bits > clusters_to_add); block = ocfs2_clusters_to_blocks(osb->sb, bit_off); mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n", num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); if (prev_blkno + prev_clusters * bpc == block && (prev_clusters + num_bits) << osb->s_clustersize_bits <= OCFS2_MAX_XATTR_TREE_LEAF_SIZE) { /* * If this cluster is contiguous with the old one and * adding this new cluster, we don't surpass the limit of * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be * initialized and used like other buckets in the previous * cluster. * So add it as a contiguous one. The caller will handle * its init process. */ v_start = prev_cpos + prev_clusters; *num_clusters = prev_clusters + num_bits; mlog(0, "Add contiguous %u clusters to previous extent rec.\n", num_bits); } else { ret = ocfs2_adjust_xattr_cross_cluster(inode, handle, first_bh, header_bh, block, prev_blkno, prev_clusters, &v_start, extend); if (ret) { mlog_errno(ret); goto leave; } } if (handle->h_buffer_credits < credits) { /* * The journal has been restarted before, and don't * have enough space for the insertion, so extend it * here. */ ret = ocfs2_extend_trans(handle, credits); if (ret) { mlog_errno(ret); goto leave; } } mlog(0, "Insert %u clusters at block %llu for xattr at %u\n", num_bits, (unsigned long long)block, v_start); ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block, num_bits, 0, meta_ac); if (ret < 0) { mlog_errno(ret); goto leave; } ret = ocfs2_journal_dirty(handle, root_bh); if (ret < 0) { mlog_errno(ret); goto leave; } leave: if (handle) ocfs2_commit_trans(osb, handle); if (data_ac) ocfs2_free_alloc_context(data_ac); if (meta_ac) ocfs2_free_alloc_context(meta_ac); return ret; } /* * Extend a new xattr bucket and move xattrs to the end one by one until * We meet with start_bh. Only move half of the xattrs to the bucket after it. */ static int ocfs2_extend_xattr_bucket(struct inode *inode, struct buffer_head *first_bh, struct buffer_head *start_bh, u32 num_clusters) { int ret, credits; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); u64 start_blk = start_bh->b_blocknr, end_blk; u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb); handle_t *handle; struct ocfs2_xattr_header *first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; u16 bucket = le16_to_cpu(first_xh->xh_num_buckets); mlog(0, "extend xattr bucket in %llu, xattr extend rec starting " "from %llu, len = %u\n", (unsigned long long)start_blk, (unsigned long long)first_bh->b_blocknr, num_clusters); BUG_ON(bucket >= num_buckets); end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket; /* * We will touch all the buckets after the start_bh(include it). * Then we add one more bucket. */ credits = end_blk - start_blk + 3 * blk_per_bucket + 1; handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); handle = NULL; mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, first_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto commit; } while (end_blk != start_blk) { ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk, end_blk + blk_per_bucket, 0); if (ret) goto commit; end_blk -= blk_per_bucket; } /* Move half of the xattr in start_blk to the next bucket. */ ret = ocfs2_divide_xattr_bucket(inode, handle, start_blk, start_blk + blk_per_bucket, NULL, 0); le16_add_cpu(&first_xh->xh_num_buckets, 1); ocfs2_journal_dirty(handle, first_bh); commit: ocfs2_commit_trans(osb, handle); out: return ret; } /* * Add new xattr bucket in an extent record and adjust the buckets accordingly. * xb_bh is the ocfs2_xattr_block. * We will move all the buckets starting from header_bh to the next place. As * for this one, half num of its xattrs will be moved to the next one. * * We will allocate a new cluster if current cluster is full and adjust * header_bh and first_bh if the insert place is moved to the new cluster. */ static int ocfs2_add_new_xattr_bucket(struct inode *inode, struct buffer_head *xb_bh, struct buffer_head *header_bh) { struct ocfs2_xattr_header *first_xh = NULL; struct buffer_head *first_bh = NULL; struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)xb_bh->b_data; struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root; struct ocfs2_extent_list *el = &xb_root->xt_list; struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)header_bh->b_data; u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash); struct super_block *sb = inode->i_sb; struct ocfs2_super *osb = OCFS2_SB(sb); int ret, num_buckets, extend = 1; u64 p_blkno; u32 e_cpos, num_clusters; mlog(0, "Add new xattr bucket starting form %llu\n", (unsigned long long)header_bh->b_blocknr); /* * Add refrence for header_bh here because it may be * changed in ocfs2_add_new_xattr_cluster and we need * to free it in the end. */ get_bh(header_bh); ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, &num_clusters, el); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_read_block(inode, p_blkno, &first_bh); if (ret) { mlog_errno(ret); goto out; } num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters; first_xh = (struct ocfs2_xattr_header *)first_bh->b_data; if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) { ret = ocfs2_add_new_xattr_cluster(inode, xb_bh, &first_bh, &header_bh, &num_clusters, e_cpos, p_blkno, &extend); if (ret) { mlog_errno(ret); goto out; } } if (extend) ret = ocfs2_extend_xattr_bucket(inode, first_bh, header_bh, num_clusters); if (ret) mlog_errno(ret); out: brelse(first_bh); brelse(header_bh); return ret; } static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode, struct ocfs2_xattr_bucket *bucket, int offs) { int block_off = offs >> inode->i_sb->s_blocksize_bits; offs = offs % inode->i_sb->s_blocksize; return bucket_block(bucket, block_off) + offs; } /* * Handle the normal xattr set, including replace, delete and new. * * Note: "local" indicates the real data's locality. So we can't * just its bucket locality by its length. */ static void ocfs2_xattr_set_entry_normal(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, u32 name_hash, int local) { struct ocfs2_xattr_entry *last, *xe; int name_len = strlen(xi->name); struct ocfs2_xattr_header *xh = xs->header; u16 count = le16_to_cpu(xh->xh_count), start; size_t blocksize = inode->i_sb->s_blocksize; char *val; size_t offs, size, new_size; last = &xh->xh_entries[count]; if (!xs->not_found) { xe = xs->here; offs = le16_to_cpu(xe->xe_name_offset); if (ocfs2_xattr_is_local(xe)) size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); else size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); /* * If the new value will be stored outside, xi->value has been * initalized as an empty ocfs2_xattr_value_root, and the same * goes with xi->value_len, so we can set new_size safely here. * See ocfs2_xattr_set_in_bucket. */ new_size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); le16_add_cpu(&xh->xh_name_value_len, -size); if (xi->value) { if (new_size > size) goto set_new_name_value; /* Now replace the old value with new one. */ if (local) xe->xe_value_size = cpu_to_le64(xi->value_len); else xe->xe_value_size = 0; val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs); memset(val + OCFS2_XATTR_SIZE(name_len), 0, size - OCFS2_XATTR_SIZE(name_len)); if (OCFS2_XATTR_SIZE(xi->value_len) > 0) memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); le16_add_cpu(&xh->xh_name_value_len, new_size); ocfs2_xattr_set_local(xe, local); return; } else { /* * Remove the old entry if there is more than one. * We don't remove the last entry so that we can * use it to indicate the hash value of the empty * bucket. */ last -= 1; le16_add_cpu(&xh->xh_count, -1); if (xh->xh_count) { memmove(xe, xe + 1, (void *)last - (void *)xe); memset(last, 0, sizeof(struct ocfs2_xattr_entry)); } else xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE); return; } } else { /* find a new entry for insert. */ int low = 0, high = count - 1, tmp; struct ocfs2_xattr_entry *tmp_xe; while (low <= high && count) { tmp = (low + high) / 2; tmp_xe = &xh->xh_entries[tmp]; if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash)) low = tmp + 1; else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash)) high = tmp - 1; else { low = tmp; break; } } xe = &xh->xh_entries[low]; if (low != count) memmove(xe + 1, xe, (void *)last - (void *)xe); le16_add_cpu(&xh->xh_count, 1); memset(xe, 0, sizeof(struct ocfs2_xattr_entry)); xe->xe_name_hash = cpu_to_le32(name_hash); xe->xe_name_len = name_len; ocfs2_xattr_set_type(xe, xi->name_index); } set_new_name_value: /* Insert the new name+value. */ size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len); /* * We must make sure that the name/value pair * exists in the same block. */ offs = le16_to_cpu(xh->xh_free_start); start = offs - size; if (start >> inode->i_sb->s_blocksize_bits != (offs - 1) >> inode->i_sb->s_blocksize_bits) { offs = offs - offs % blocksize; xh->xh_free_start = cpu_to_le16(offs); } val = ocfs2_xattr_bucket_get_val(inode, xs->bucket, offs - size); xe->xe_name_offset = cpu_to_le16(offs - size); memset(val, 0, size); memcpy(val, xi->name, name_len); memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len); xe->xe_value_size = cpu_to_le64(xi->value_len); ocfs2_xattr_set_local(xe, local); xs->here = xe; le16_add_cpu(&xh->xh_free_start, -size); le16_add_cpu(&xh->xh_name_value_len, size); return; } /* * Set the xattr entry in the specified bucket. * The bucket is indicated by xs->bucket and it should have the enough * space for the xattr insertion. */ static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs, u32 name_hash, int local) { int ret; handle_t *handle = NULL; u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb); struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n", (unsigned long)xi->value_len, xi->name_index, (unsigned long long)bucket_blkno(xs->bucket)); if (!xs->bucket->bu_bhs[1]) { ret = ocfs2_read_blocks(inode, bucket_blkno(xs->bucket) + 1, blk_per_bucket - 1, &xs->bucket->bu_bhs[1], 0); if (ret) { mlog_errno(ret); goto out; } } handle = ocfs2_start_trans(osb, blk_per_bucket); if (IS_ERR(handle)) { ret = PTR_ERR(handle); handle = NULL; mlog_errno(ret); goto out; } ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out; } ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local); ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket); out: ocfs2_commit_trans(osb, handle); return ret; } static int ocfs2_xattr_value_update_size(struct inode *inode, struct buffer_head *xe_bh, struct ocfs2_xattr_entry *xe, u64 new_size) { int ret; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); handle_t *handle = NULL; handle = ocfs2_start_trans(osb, 1); if (IS_ERR(handle)) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, xe_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out_commit; } xe->xe_value_size = cpu_to_le64(new_size); ret = ocfs2_journal_dirty(handle, xe_bh); if (ret < 0) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); out: return ret; } /* * Truncate the specified xe_off entry in xattr bucket. * bucket is indicated by header_bh and len is the new length. * Both the ocfs2_xattr_value_root and the entry will be updated here. * * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed. */ static int ocfs2_xattr_bucket_value_truncate(struct inode *inode, struct buffer_head *header_bh, int xe_off, int len) { int ret, offset; u64 value_blk; struct buffer_head *value_bh = NULL; struct ocfs2_xattr_value_root *xv; struct ocfs2_xattr_entry *xe; struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)header_bh->b_data; size_t blocksize = inode->i_sb->s_blocksize; xe = &xh->xh_entries[xe_off]; BUG_ON(!xe || ocfs2_xattr_is_local(xe)); offset = le16_to_cpu(xe->xe_name_offset) + OCFS2_XATTR_SIZE(xe->xe_name_len); value_blk = offset / blocksize; /* We don't allow ocfs2_xattr_value to be stored in different block. */ BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize); value_blk += header_bh->b_blocknr; ret = ocfs2_read_block(inode, value_blk, &value_bh); if (ret) { mlog_errno(ret); goto out; } xv = (struct ocfs2_xattr_value_root *) (value_bh->b_data + offset % blocksize); mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n", xe_off, (unsigned long long)header_bh->b_blocknr, len); ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len); if (ret) { mlog_errno(ret); goto out; } out: brelse(value_bh); return ret; } static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode, struct ocfs2_xattr_search *xs, int len) { int ret, offset; struct ocfs2_xattr_entry *xe = xs->here; struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base; BUG_ON(!xs->bucket->bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe)); offset = xe - xh->xh_entries; ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket->bu_bhs[0], offset, len); if (ret) mlog_errno(ret); return ret; } static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode, struct ocfs2_xattr_search *xs, char *val, int value_len) { int offset; struct ocfs2_xattr_value_root *xv; struct ocfs2_xattr_entry *xe = xs->here; BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe)); offset = le16_to_cpu(xe->xe_name_offset) + OCFS2_XATTR_SIZE(xe->xe_name_len); xv = (struct ocfs2_xattr_value_root *)(xs->base + offset); return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len); } static int ocfs2_rm_xattr_cluster(struct inode *inode, struct buffer_head *root_bh, u64 blkno, u32 cpos, u32 len) { int ret; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct inode *tl_inode = osb->osb_tl_inode; handle_t *handle; struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)root_bh->b_data; struct ocfs2_alloc_context *meta_ac = NULL; struct ocfs2_cached_dealloc_ctxt dealloc; struct ocfs2_extent_tree et; ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh); ocfs2_init_dealloc_ctxt(&dealloc); mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n", cpos, len, (unsigned long long)blkno); ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len); ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac); if (ret) { mlog_errno(ret); return ret; } mutex_lock(&tl_inode->i_mutex); if (ocfs2_truncate_log_needs_flush(osb)) { ret = __ocfs2_flush_truncate_log(osb); if (ret < 0) { mlog_errno(ret); goto out; } } handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS); if (IS_ERR(handle)) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_journal_access(handle, inode, root_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac, &dealloc); if (ret) { mlog_errno(ret); goto out_commit; } le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len); ret = ocfs2_journal_dirty(handle, root_bh); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_truncate_log_append(osb, handle, blkno, len); if (ret) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); out: ocfs2_schedule_truncate_log_flush(osb, 1); mutex_unlock(&tl_inode->i_mutex); if (meta_ac) ocfs2_free_alloc_context(meta_ac); ocfs2_run_deallocs(osb, &dealloc); return ret; } static void ocfs2_xattr_bucket_remove_xs(struct inode *inode, struct ocfs2_xattr_search *xs) { handle_t *handle = NULL; struct ocfs2_xattr_header *xh = bucket_xh(xs->bucket); struct ocfs2_xattr_entry *last = &xh->xh_entries[ le16_to_cpu(xh->xh_count) - 1]; int ret = 0; handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), ocfs2_blocks_per_xattr_bucket(inode->i_sb)); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); return; } ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out_commit; } /* Remove the old entry. */ memmove(xs->here, xs->here + 1, (void *)last - (void *)xs->here); memset(last, 0, sizeof(struct ocfs2_xattr_entry)); le16_add_cpu(&xh->xh_count, -1); ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket); out_commit: ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); } /* * Set the xattr name/value in the bucket specified in xs. * * As the new value in xi may be stored in the bucket or in an outside cluster, * we divide the whole process into 3 steps: * 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket) * 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs) * 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside) * 4. If the clusters for the new outside value can't be allocated, we need * to free the xattr we allocated in set. */ static int ocfs2_xattr_set_in_bucket(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs) { int ret, local = 1; size_t value_len; char *val = (char *)xi->value; struct ocfs2_xattr_entry *xe = xs->here; u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name, strlen(xi->name)); if (!xs->not_found && !ocfs2_xattr_is_local(xe)) { /* * We need to truncate the xattr storage first. * * If both the old and new value are stored to * outside block, we only need to truncate * the storage and then set the value outside. * * If the new value should be stored within block, * we should free all the outside block first and * the modification to the xattr block will be done * by following steps. */ if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) value_len = xi->value_len; else value_len = 0; ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, value_len); if (ret) goto out; if (value_len) goto set_value_outside; } value_len = xi->value_len; /* So we have to handle the inside block change now. */ if (value_len > OCFS2_XATTR_INLINE_SIZE) { /* * If the new value will be stored outside of block, * initalize a new empty value root and insert it first. */ local = 0; xi->value = &def_xv; xi->value_len = OCFS2_XATTR_ROOT_SIZE; } ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local); if (ret) { mlog_errno(ret); goto out; } if (value_len <= OCFS2_XATTR_INLINE_SIZE) goto out; /* allocate the space now for the outside block storage. */ ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs, value_len); if (ret) { mlog_errno(ret); if (xs->not_found) { /* * We can't allocate enough clusters for outside * storage and we have allocated xattr already, * so need to remove it. */ ocfs2_xattr_bucket_remove_xs(inode, xs); } goto out; } set_value_outside: ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len); out: return ret; } /* * check whether the xattr bucket is filled up with the same hash value. * If we want to insert the xattr with the same hash, return -ENOSPC. * If we want to insert a xattr with different hash value, go ahead * and ocfs2_divide_xattr_bucket will handle this. */ static int ocfs2_check_xattr_bucket_collision(struct inode *inode, struct ocfs2_xattr_bucket *bucket, const char *name) { struct ocfs2_xattr_header *xh = bucket_xh(bucket); u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name)); if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash)) return 0; if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash == xh->xh_entries[0].xe_name_hash) { mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, " "hash = %u\n", (unsigned long long)bucket_blkno(bucket), le32_to_cpu(xh->xh_entries[0].xe_name_hash)); return -ENOSPC; } return 0; } static int ocfs2_xattr_set_entry_index_block(struct inode *inode, struct ocfs2_xattr_info *xi, struct ocfs2_xattr_search *xs) { struct ocfs2_xattr_header *xh; struct ocfs2_xattr_entry *xe; u16 count, header_size, xh_free_start; int free, max_free, need, old; size_t value_size = 0, name_len = strlen(xi->name); size_t blocksize = inode->i_sb->s_blocksize; int ret, allocation = 0; mlog_entry("Set xattr %s in xattr index block\n", xi->name); try_again: xh = xs->header; count = le16_to_cpu(xh->xh_count); xh_free_start = le16_to_cpu(xh->xh_free_start); header_size = sizeof(struct ocfs2_xattr_header) + count * sizeof(struct ocfs2_xattr_entry); max_free = OCFS2_XATTR_BUCKET_SIZE - le16_to_cpu(xh->xh_name_value_len) - header_size; mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " "of %u which exceed block size\n", (unsigned long long)bucket_blkno(xs->bucket), header_size); if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) value_size = OCFS2_XATTR_ROOT_SIZE; else if (xi->value) value_size = OCFS2_XATTR_SIZE(xi->value_len); if (xs->not_found) need = sizeof(struct ocfs2_xattr_entry) + OCFS2_XATTR_SIZE(name_len) + value_size; else { need = value_size + OCFS2_XATTR_SIZE(name_len); /* * We only replace the old value if the new length is smaller * than the old one. Otherwise we will allocate new space in the * bucket to store it. */ xe = xs->here; if (ocfs2_xattr_is_local(xe)) old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); else old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); if (old >= value_size) need = 0; } free = xh_free_start - header_size; /* * We need to make sure the new name/value pair * can exist in the same block. */ if (xh_free_start % blocksize < need) free -= xh_free_start % blocksize; mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" " %u\n", xs->not_found, (unsigned long long)bucket_blkno(xs->bucket), free, need, max_free, le16_to_cpu(xh->xh_free_start), le16_to_cpu(xh->xh_name_value_len)); if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { if (need <= max_free && count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { /* * We can create the space by defragment. Since only the * name/value will be moved, the xe shouldn't be changed * in xs. */ ret = ocfs2_defrag_xattr_bucket(inode, xs->bucket); if (ret) { mlog_errno(ret); goto out; } xh_free_start = le16_to_cpu(xh->xh_free_start); free = xh_free_start - header_size; if (xh_free_start % blocksize < need) free -= xh_free_start % blocksize; if (free >= need) goto xattr_set; mlog(0, "Can't get enough space for xattr insert by " "defragment. Need %u bytes, but we have %d, so " "allocate new bucket for it.\n", need, free); } /* * We have to add new buckets or clusters and one * allocation should leave us enough space for insert. */ BUG_ON(allocation); /* * We do not allow for overlapping ranges between buckets. And * the maximum number of collisions we will allow for then is * one bucket's worth, so check it here whether we need to * add a new bucket for the insert. */ ret = ocfs2_check_xattr_bucket_collision(inode, xs->bucket, xi->name); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_add_new_xattr_bucket(inode, xs->xattr_bh, xs->bucket->bu_bhs[0]); if (ret) { mlog_errno(ret); goto out; } ocfs2_xattr_bucket_relse(xs->bucket); ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, xi->name_index, xi->name, xs); if (ret && ret != -ENODATA) goto out; xs->not_found = ret; allocation = 1; goto try_again; } xattr_set: ret = ocfs2_xattr_set_in_bucket(inode, xi, xs); out: mlog_exit(ret); return ret; } static int ocfs2_delete_xattr_in_bucket(struct inode *inode, struct ocfs2_xattr_bucket *bucket, void *para) { int ret = 0; struct ocfs2_xattr_header *xh = bucket_xh(bucket); u16 i; struct ocfs2_xattr_entry *xe; for (i = 0; i < le16_to_cpu(xh->xh_count); i++) { xe = &xh->xh_entries[i]; if (ocfs2_xattr_is_local(xe)) continue; ret = ocfs2_xattr_bucket_value_truncate(inode, bucket->bu_bhs[0], i, 0); if (ret) { mlog_errno(ret); break; } } return ret; } static int ocfs2_delete_xattr_index_block(struct inode *inode, struct buffer_head *xb_bh) { struct ocfs2_xattr_block *xb = (struct ocfs2_xattr_block *)xb_bh->b_data; struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list; int ret = 0; u32 name_hash = UINT_MAX, e_cpos, num_clusters; u64 p_blkno; if (le16_to_cpu(el->l_next_free_rec) == 0) return 0; while (name_hash > 0) { ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos, &num_clusters, el); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters, ocfs2_delete_xattr_in_bucket, NULL); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_rm_xattr_cluster(inode, xb_bh, p_blkno, e_cpos, num_clusters); if (ret) { mlog_errno(ret); break; } if (e_cpos == 0) break; name_hash = e_cpos - 1; } out: return ret; } /* * 'trusted' attributes support */ static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size, const char *name, size_t name_len) { const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN; const size_t total_len = prefix_len + name_len + 1; if (list && total_len <= list_size) { memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len); memcpy(list + prefix_len, name, name_len); list[prefix_len + name_len] = '\0'; } return total_len; } static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name, void *buffer, size_t size) { if (strcmp(name, "") == 0) return -EINVAL; return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name, buffer, size); } static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { if (strcmp(name, "") == 0) return -EINVAL; return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value, size, flags); } struct xattr_handler ocfs2_xattr_trusted_handler = { .prefix = XATTR_TRUSTED_PREFIX, .list = ocfs2_xattr_trusted_list, .get = ocfs2_xattr_trusted_get, .set = ocfs2_xattr_trusted_set, }; /* * 'user' attributes support */ static size_t ocfs2_xattr_user_list(struct inode *inode, char *list, size_t list_size, const char *name, size_t name_len) { const size_t prefix_len = XATTR_USER_PREFIX_LEN; const size_t total_len = prefix_len + name_len + 1; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) return 0; if (list && total_len <= list_size) { memcpy(list, XATTR_USER_PREFIX, prefix_len); memcpy(list + prefix_len, name, name_len); list[prefix_len + name_len] = '\0'; } return total_len; } static int ocfs2_xattr_user_get(struct inode *inode, const char *name, void *buffer, size_t size) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); if (strcmp(name, "") == 0) return -EINVAL; if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) return -EOPNOTSUPP; return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name, buffer, size); } static int ocfs2_xattr_user_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); if (strcmp(name, "") == 0) return -EINVAL; if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR) return -EOPNOTSUPP; return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value, size, flags); } struct xattr_handler ocfs2_xattr_user_handler = { .prefix = XATTR_USER_PREFIX, .list = ocfs2_xattr_user_list, .get = ocfs2_xattr_user_get, .set = ocfs2_xattr_user_set, };