1 files changed, 165 insertions, 93 deletions

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 53980ee164ed..649dc2953901 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -108,6 +108,10 @@ const struct xattr_handler *ext4_xattr_handlers[] = {
 #define EA_BLOCK_CACHE(inode)   (((struct ext4_sb_info *) \
                                 inode->i_sb->s_fs_info)->s_ea_block_cache)
 
+static int
+ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array,
+                        struct inode *inode);
+
 #ifdef CONFIG_LOCKDEP
 void ext4_xattr_inode_set_class(struct inode *ea_inode)
 {
@@ -652,6 +656,128 @@ static void ext4_xattr_update_super_block(handle_t *handle,
         }
 }
 
+static int ext4_xattr_ensure_credits(handle_t *handle, struct inode *inode,
+                                     int credits, struct buffer_head *bh,
+                                     bool dirty, bool block_csum)
+{
+        int error;
+
+        if (!ext4_handle_valid(handle))
+                return 0;
+
+        if (handle->h_buffer_credits >= credits)
+                return 0;
+
+        error = ext4_journal_extend(handle, credits - handle->h_buffer_credits);
+        if (!error)
+                return 0;
+        if (error < 0) {
+                ext4_warning(inode->i_sb, "Extend journal (error %d)", error);
+                return error;
+        }
+
+        if (bh && dirty) {
+                if (block_csum)
+                        ext4_xattr_block_csum_set(inode, bh);
+                error = ext4_handle_dirty_metadata(handle, NULL, bh);
+                if (error) {
+                        ext4_warning(inode->i_sb, "Handle metadata (error %d)",
+                                     error);
+                        return error;
+                }
+        }
+
+        error = ext4_journal_restart(handle, credits);
+        if (error) {
+                ext4_warning(inode->i_sb, "Restart journal (error %d)", error);
+                return error;
+        }
+
+        if (bh) {
+                error = ext4_journal_get_write_access(handle, bh);
+                if (error) {
+                        ext4_warning(inode->i_sb,
+                                     "Get write access failed (error %d)",
+                                     error);
+                        return error;
+                }
+        }
+        return 0;
+}
+
+static void
+ext4_xattr_inode_remove_all(handle_t *handle, struct inode *parent,
+                            struct buffer_head *bh,
+                            struct ext4_xattr_entry *first, bool block_csum,
+                            struct ext4_xattr_inode_array **ea_inode_array,
+                            int extra_credits)
+{
+        struct inode *ea_inode;
+        struct ext4_xattr_entry *entry;
+        bool dirty = false;
+        unsigned int ea_ino;
+        int err;
+        int credits;
+
+        /* One credit for dec ref on ea_inode, one for orphan list addition, */
+        credits = 2 + extra_credits;
+
+        for (entry = first; !IS_LAST_ENTRY(entry);
+             entry = EXT4_XATTR_NEXT(entry)) {
+                if (!entry->e_value_inum)
+                        continue;
+                ea_ino = le32_to_cpu(entry->e_value_inum);
+                err = ext4_xattr_inode_iget(parent, ea_ino, &ea_inode);
+                if (err)
+                        continue;
+
+                err = ext4_expand_inode_array(ea_inode_array, ea_inode);
+                if (err) {
+                        ext4_warning_inode(ea_inode,
+                                           "Expand inode array err=%d", err);
+                        iput(ea_inode);
+                        continue;
+                }
+
+                err = ext4_xattr_ensure_credits(handle, parent, credits, bh,
+                                                dirty, block_csum);
+                if (err) {
+                        ext4_warning_inode(ea_inode, "Ensure credits err=%d",
+                                           err);
+                        continue;
+                }
+
+                inode_lock(ea_inode);
+                clear_nlink(ea_inode);
+                ext4_orphan_add(handle, ea_inode);
+                inode_unlock(ea_inode);
+
+                /*
+                 * Forget about ea_inode within the same transaction that
+                 * decrements the ref count. This avoids duplicate decrements in
+                 * case the rest of the work spills over to subsequent
+                 * transactions.
+                 */
+                entry->e_value_inum = 0;
+                entry->e_value_size = 0;
+
+                dirty = true;
+        }
+
+        if (dirty) {
+                /*
+                 * Note that we are deliberately skipping csum calculation for
+                 * the final update because we do not expect any journal
+                 * restarts until xattr block is freed.
+                 */
+
+                err = ext4_handle_dirty_metadata(handle, NULL, bh);
+                if (err)
+                        ext4_warning_inode(parent,
+                                           "handle dirty metadata err=%d", err);
+        }
+}
+
 /*
  * Release the xattr block BH: If the reference count is > 1, decrement it;
  * otherwise free the block.
@@ -1982,42 +2108,6 @@ ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array,
         return 0;
 }
 
-/**
- * Add xattr inode to orphan list
- */
-static int
-ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, int credits,
-                            struct ext4_xattr_inode_array *ea_inode_array)
-{
-        int idx = 0, error = 0;
-        struct inode *ea_inode;
-
-        if (ea_inode_array == NULL)
-                return 0;
-
-        for (; idx < ea_inode_array->count; ++idx) {
-                if (!ext4_handle_has_enough_credits(handle, credits)) {
-                        error = ext4_journal_extend(handle, credits);
-                        if (error > 0)
-                                error = ext4_journal_restart(handle, credits);
-
-                        if (error != 0) {
-                                ext4_warning(inode->i_sb,
-                                        "couldn't extend journal "
-                                        "(err %d)", error);
-                                return error;
-                        }
-                }
-                ea_inode = ea_inode_array->inodes[idx];
-                inode_lock(ea_inode);
-                ext4_orphan_add(handle, ea_inode);
-                inode_unlock(ea_inode);
-                /* the inode's i_count will be released by caller */
-        }
-
-        return 0;
-}
-
 /*
  * ext4_xattr_delete_inode()
  *
@@ -2030,16 +2120,23 @@ ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode, int credits,
  */
 int
 ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
-                        struct ext4_xattr_inode_array **ea_inode_array)
+                        struct ext4_xattr_inode_array **ea_inode_array,
+                        int extra_credits)
 {
         struct buffer_head *bh = NULL;
         struct ext4_xattr_ibody_header *header;
         struct ext4_inode *raw_inode;
-        struct ext4_iloc iloc;
-        struct ext4_xattr_entry *entry;
-        struct inode *ea_inode;
-        unsigned int ea_ino;
-        int credits = 3, error = 0;
+        struct ext4_iloc iloc = { .bh = NULL };
+        int error;
+
+        error = ext4_xattr_ensure_credits(handle, inode, extra_credits,
+                                          NULL /* bh */,
+                                          false /* dirty */,
+                                          false /* block_csum */);
+        if (error) {
+                EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error);
+                goto cleanup;
+        }
 
         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
                 goto delete_external_ea;
@@ -2047,31 +2144,20 @@ ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
         error = ext4_get_inode_loc(inode, &iloc);
         if (error)
                 goto cleanup;
+
+        error = ext4_journal_get_write_access(handle, iloc.bh);
+        if (error)
+                goto cleanup;
+
         raw_inode = ext4_raw_inode(&iloc);
         header = IHDR(inode, raw_inode);
-        for (entry = IFIRST(header); !IS_LAST_ENTRY(entry);
-             entry = EXT4_XATTR_NEXT(entry)) {
-                if (!entry->e_value_inum)
-                        continue;
-                ea_ino = le32_to_cpu(entry->e_value_inum);
-                error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode);
-                if (error)
-                        continue;
-                error = ext4_expand_inode_array(ea_inode_array, ea_inode);
-                if (error) {
-                        iput(ea_inode);
-                        brelse(iloc.bh);
-                        goto cleanup;
-                }
-                entry->e_value_inum = 0;
-        }
-        brelse(iloc.bh);
+        ext4_xattr_inode_remove_all(handle, inode, iloc.bh, IFIRST(header),
+                                    false /* block_csum */, ea_inode_array,
+                                    extra_credits);
 
 delete_external_ea:
         if (!EXT4_I(inode)->i_file_acl) {
-                /* add xattr inode to orphan list */
-                error = ext4_xattr_inode_orphan_add(handle, inode, credits,
-                                                    *ea_inode_array);
+                error = 0;
                 goto cleanup;
         }
         bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl);
@@ -2089,46 +2175,32 @@ delete_external_ea:
                 goto cleanup;
         }
 
-        for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
-             entry = EXT4_XATTR_NEXT(entry)) {
-                if (!entry->e_value_inum)
-                        continue;
-                ea_ino = le32_to_cpu(entry->e_value_inum);
-                error = ext4_xattr_inode_iget(inode, ea_ino, &ea_inode);
-                if (error)
-                        continue;
-                error = ext4_expand_inode_array(ea_inode_array, ea_inode);
-                if (error)
-                        goto cleanup;
-                entry->e_value_inum = 0;
-        }
-
-        /* add xattr inode to orphan list */
-        error = ext4_xattr_inode_orphan_add(handle, inode, credits,
-                                        *ea_inode_array);
-        if (error)
-                goto cleanup;
-
-        if (!IS_NOQUOTA(inode))
-                credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb);
-
-        if (!ext4_handle_has_enough_credits(handle, credits)) {
-                error = ext4_journal_extend(handle, credits);
-                if (error > 0)
-                        error = ext4_journal_restart(handle, credits);
+        if (ext4_has_feature_ea_inode(inode->i_sb)) {
+                error = ext4_journal_get_write_access(handle, bh);
                 if (error) {
-                        ext4_warning(inode->i_sb,
-                                "couldn't extend journal (err %d)", error);
+                        EXT4_ERROR_INODE(inode, "write access %llu",
+                                         EXT4_I(inode)->i_file_acl);
                         goto cleanup;
                 }
+                ext4_xattr_inode_remove_all(handle, inode, bh,
+                                            BFIRST(bh),
+                                            true /* block_csum */,
+                                            ea_inode_array,
+                                            extra_credits);
         }
 
         ext4_xattr_release_block(handle, inode, bh);
+        /* Update i_file_acl within the same transaction that releases block. */
         EXT4_I(inode)->i_file_acl = 0;
-
+        error = ext4_mark_inode_dirty(handle, inode);
+        if (error) {
+                EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)",
+                                 error);
+                goto cleanup;
+        }
 cleanup:
+        brelse(iloc.bh);
         brelse(bh);
-
         return error;
 }