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hc
2024-02-19 151fecfb72a0d602dfe79790602ef64b4e241574 
 kernel/fs/ext4/xattr.c
....@@ -123,7 +123,11 @@
123123 #ifdef CONFIG_LOCKDEP
124124 void ext4_xattr_inode_set_class(struct inode *ea_inode)
125125 {
126
+	struct ext4_inode_info *ei = EXT4_I(ea_inode);
127
+
126128 	lockdep_set_subclass(&ea_inode->i_rwsem, 1);
129
+	(void) ei;	/* shut up clang warning if !CONFIG_LOCKDEP */
130
+	lockdep_set_subclass(&ei->i_data_sem, I_DATA_SEM_EA);
127131 }
128132 #endif
129133 
....@@ -386,7 +390,18 @@
386390 	struct inode *inode;
387391 	int err;
388392 
389
-	inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL);
393
+	/*
394
+	 * We have to check for this corruption early as otherwise
395
+	 * iget_locked() could wait indefinitely for the state of our
396
+	 * parent inode.
397
+	 */
398
+	if (parent->i_ino == ea_ino) {
399
+		ext4_error(parent->i_sb,
400
+			   "Parent and EA inode have the same ino %lu", ea_ino);
401
+		return -EFSCORRUPTED;
402
+	}
403
+
404
+	inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_EA_INODE);
390405 	if (IS_ERR(inode)) {
391406 		err = PTR_ERR(inode);
392407 		ext4_error(parent->i_sb,
....@@ -394,23 +409,6 @@
394409 			   err);
395410 		return err;
396411 	}
397
-
398
-	if (is_bad_inode(inode)) {
399
-		ext4_error(parent->i_sb,
400
-			   "error while reading EA inode %lu is_bad_inode",
401
-			   ea_ino);
402
-		err = -EIO;
403
-		goto error;
404
-	}
405
-
406
-	if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) {
407
-		ext4_error(parent->i_sb,
408
-			   "EA inode %lu does not have EXT4_EA_INODE_FL flag",
409
-			    ea_ino);
410
-		err = -EINVAL;
411
-		goto error;
412
-	}
413
-
414412 	ext4_xattr_inode_set_class(inode);
415413 
416414 	/*
....@@ -431,9 +429,21 @@
431429 
432430 	*ea_inode = inode;
433431 	return 0;
434
-error:
435
-	iput(inode);
436
-	return err;
432
+}
433
+
434
+/* Remove entry from mbcache when EA inode is getting evicted */
435
+void ext4_evict_ea_inode(struct inode *inode)
436
+{
437
+	struct mb_cache_entry *oe;
438
+
439
+	if (!EA_INODE_CACHE(inode))
440
+		return;
441
+	/* Wait for entry to get unused so that we can remove it */
442
+	while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode),
443
+			ext4_xattr_inode_get_hash(inode), inode->i_ino))) {
444
+		mb_cache_entry_wait_unused(oe);
445
+		mb_cache_entry_put(EA_INODE_CACHE(inode), oe);
446
+	}
437447 }
438448 
439449 static int
....@@ -972,10 +982,8 @@
972982 static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
973983 				       int ref_change)
974984 {
975
-	struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode);
976985 	struct ext4_iloc iloc;
977986 	s64 ref_count;
978
-	u32 hash;
979987 	int ret;
980988 
981989 	inode_lock(ea_inode);
....@@ -998,14 +1006,6 @@
9981006 
9991007 			set_nlink(ea_inode, 1);
10001008 			ext4_orphan_del(handle, ea_inode);
1001
-
1002
-			if (ea_inode_cache) {
1003
-				hash = ext4_xattr_inode_get_hash(ea_inode);
1004
-				mb_cache_entry_create(ea_inode_cache,
1005
-						      GFP_NOFS, hash,
1006
-						      ea_inode->i_ino,
1007
-						      true /* reusable */);
1008
-			}
10091009 		}
10101010 	} else {
10111011 		WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld",
....@@ -1018,12 +1018,6 @@
10181018 
10191019 			clear_nlink(ea_inode);
10201020 			ext4_orphan_add(handle, ea_inode);
1021
-
1022
-			if (ea_inode_cache) {
1023
-				hash = ext4_xattr_inode_get_hash(ea_inode);
1024
-				mb_cache_entry_delete(ea_inode_cache, hash,
1025
-						      ea_inode->i_ino);
1026
-			}
10271021 		}
10281022 	}
10291023 
....@@ -1231,6 +1225,7 @@
12311225 	if (error)
12321226 		goto out;
12331227 
1228
+retry_ref:
12341229 	lock_buffer(bh);
12351230 	hash = le32_to_cpu(BHDR(bh)->h_hash);
12361231 	ref = le32_to_cpu(BHDR(bh)->h_refcount);
....@@ -1240,9 +1235,18 @@
12401235 		 * This must happen under buffer lock for
12411236 		 * ext4_xattr_block_set() to reliably detect freed block
12421237 		 */
1243
-		if (ea_block_cache)
1244
-			mb_cache_entry_delete(ea_block_cache, hash,
1245
-					      bh->b_blocknr);
1238
+		if (ea_block_cache) {
1239
+			struct mb_cache_entry *oe;
1240
+
1241
+			oe = mb_cache_entry_delete_or_get(ea_block_cache, hash,
1242
+							  bh->b_blocknr);
1243
+			if (oe) {
1244
+				unlock_buffer(bh);
1245
+				mb_cache_entry_wait_unused(oe);
1246
+				mb_cache_entry_put(ea_block_cache, oe);
1247
+				goto retry_ref;
1248
+			}
1249
+		}
12461250 		get_bh(bh);
12471251 		unlock_buffer(bh);
12481252 
....@@ -1266,7 +1270,7 @@
12661270 				ce = mb_cache_entry_get(ea_block_cache, hash,
12671271 							bh->b_blocknr);
12681272 				if (ce) {
1269
-					ce->e_reusable = 1;
1273
+					set_bit(MBE_REUSABLE_B, &ce->e_flags);
12701274 					mb_cache_entry_put(ea_block_cache, ce);
12711275 				}
12721276 			}
....@@ -1406,6 +1410,13 @@
14061410 	uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) };
14071411 	int err;
14081412 
1413
+	if (inode->i_sb->s_root == NULL) {
1414
+		ext4_warning(inode->i_sb,
1415
+			     "refuse to create EA inode when umounting");
1416
+		WARN_ON(1);
1417
+		return ERR_PTR(-EINVAL);
1418
+	}
1419
+
14091420 	/*
14101421 	 * Let the next inode be the goal, so we try and allocate the EA inode
14111422 	 * in the same group, or nearby one.
....@@ -1425,6 +1436,9 @@
14251436 		if (!err)
14261437 			err = ext4_inode_attach_jinode(ea_inode);
14271438 		if (err) {
1439
+			if (ext4_xattr_inode_dec_ref(handle, ea_inode))
1440
+				ext4_warning_inode(ea_inode,
1441
+					"cleanup dec ref error %d", err);
14281442 			iput(ea_inode);
14291443 			return ERR_PTR(err);
14301444 		}
....@@ -1470,11 +1484,11 @@
14701484 
14711485 	while (ce) {
14721486 		ea_inode = ext4_iget(inode->i_sb, ce->e_value,
1473
-				     EXT4_IGET_NORMAL);
1474
-		if (!IS_ERR(ea_inode) &&
1475
-		    !is_bad_inode(ea_inode) &&
1476
-		    (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) &&
1477
-		    i_size_read(ea_inode) == value_len &&
1487
+				     EXT4_IGET_EA_INODE);
1488
+		if (IS_ERR(ea_inode))
1489
+			goto next_entry;
1490
+		ext4_xattr_inode_set_class(ea_inode);
1491
+		if (i_size_read(ea_inode) == value_len &&
14781492 		    !ext4_xattr_inode_read(ea_inode, ea_data, value_len) &&
14791493 		    !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data,
14801494 						    value_len) &&
....@@ -1484,9 +1498,8 @@
14841498 			kvfree(ea_data);
14851499 			return ea_inode;
14861500 		}
1487
-
1488
-		if (!IS_ERR(ea_inode))
1489
-			iput(ea_inode);
1501
+		iput(ea_inode);
1502
+	next_entry:
14901503 		ce = mb_cache_entry_find_next(ea_inode_cache, ce);
14911504 	}
14921505 	kvfree(ea_data);
....@@ -1614,7 +1627,7 @@
16141627 		 * If storing the value in an external inode is an option,
16151628 		 * reserve space for xattr entries/names in the external
16161629 		 * attribute block so that a long value does not occupy the
1617
-		 * whole space and prevent futher entries being added.
1630
+		 * whole space and prevent further entries being added.
16181631 		 */
16191632 		if (ext4_has_feature_ea_inode(inode->i_sb) &&
16201633 		    new_size && is_block &&
....@@ -1712,6 +1725,20 @@
17121725 		memmove(here, (void *)here + size,
17131726 			(void *)last - (void *)here + sizeof(__u32));
17141727 		memset(last, 0, size);
1728
+
1729
+		/*
1730
+		 * Update i_inline_off - moved ibody region might contain
1731
+		 * system.data attribute.  Handling a failure here won't
1732
+		 * cause other complications for setting an xattr.
1733
+		 */
1734
+		if (!is_block && ext4_has_inline_data(inode)) {
1735
+			ret = ext4_find_inline_data_nolock(inode);
1736
+			if (ret) {
1737
+				ext4_warning_inode(inode,
1738
+					"unable to update i_inline_off");
1739
+				goto out;
1740
+			}
1741
+		}
17151742 	} else if (s->not_found) {
17161743 		/* Insert new name. */
17171744 		size_t size = EXT4_XATTR_LEN(name_len);
....@@ -1851,6 +1878,8 @@
18511878 #define header(x) ((struct ext4_xattr_header *)(x))
18521879 
18531880 	if (s->base) {
1881
+		int offset = (char *)s->here - bs->bh->b_data;
1882
+
18541883 		BUFFER_TRACE(bs->bh, "get_write_access");
18551884 		error = ext4_journal_get_write_access(handle, bs->bh);
18561885 		if (error)
....@@ -1865,9 +1894,20 @@
18651894 			 * ext4_xattr_block_set() to reliably detect modified
18661895 			 * block
18671896 			 */
1868
-			if (ea_block_cache)
1869
-				mb_cache_entry_delete(ea_block_cache, hash,
1870
-						      bs->bh->b_blocknr);
1897
+			if (ea_block_cache) {
1898
+				struct mb_cache_entry *oe;
1899
+
1900
+				oe = mb_cache_entry_delete_or_get(ea_block_cache,
1901
+					hash, bs->bh->b_blocknr);
1902
+				if (oe) {
1903
+					/*
1904
+					 * Xattr block is getting reused. Leave
1905
+					 * it alone.
1906
+					 */
1907
+					mb_cache_entry_put(ea_block_cache, oe);
1908
+					goto clone_block;
1909
+				}
1910
+			}
18711911 			ea_bdebug(bs->bh, "modifying in-place");
18721912 			error = ext4_xattr_set_entry(i, s, handle, inode,
18731913 						     true /* is_block */);
....@@ -1882,50 +1922,47 @@
18821922 			if (error)
18831923 				goto cleanup;
18841924 			goto inserted;
1885
-		} else {
1886
-			int offset = (char *)s->here - bs->bh->b_data;
1925
+		}
1926
+clone_block:
1927
+		unlock_buffer(bs->bh);
1928
+		ea_bdebug(bs->bh, "cloning");
1929
+		s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS);
1930
+		error = -ENOMEM;
1931
+		if (s->base == NULL)
1932
+			goto cleanup;
1933
+		s->first = ENTRY(header(s->base)+1);
1934
+		header(s->base)->h_refcount = cpu_to_le32(1);
1935
+		s->here = ENTRY(s->base + offset);
1936
+		s->end = s->base + bs->bh->b_size;
18871937 
1888
-			unlock_buffer(bs->bh);
1889
-			ea_bdebug(bs->bh, "cloning");
1890
-			s->base = kmalloc(bs->bh->b_size, GFP_NOFS);
1891
-			error = -ENOMEM;
1892
-			if (s->base == NULL)
1938
+		/*
1939
+		 * If existing entry points to an xattr inode, we need
1940
+		 * to prevent ext4_xattr_set_entry() from decrementing
1941
+		 * ref count on it because the reference belongs to the
1942
+		 * original block. In this case, make the entry look
1943
+		 * like it has an empty value.
1944
+		 */
1945
+		if (!s->not_found && s->here->e_value_inum) {
1946
+			ea_ino = le32_to_cpu(s->here->e_value_inum);
1947
+			error = ext4_xattr_inode_iget(inode, ea_ino,
1948
+				      le32_to_cpu(s->here->e_hash),
1949
+				      &tmp_inode);
1950
+			if (error)
18931951 				goto cleanup;
1894
-			memcpy(s->base, BHDR(bs->bh), bs->bh->b_size);
1895
-			s->first = ENTRY(header(s->base)+1);
1896
-			header(s->base)->h_refcount = cpu_to_le32(1);
1897
-			s->here = ENTRY(s->base + offset);
1898
-			s->end = s->base + bs->bh->b_size;
18991952 
1900
-			/*
1901
-			 * If existing entry points to an xattr inode, we need
1902
-			 * to prevent ext4_xattr_set_entry() from decrementing
1903
-			 * ref count on it because the reference belongs to the
1904
-			 * original block. In this case, make the entry look
1905
-			 * like it has an empty value.
1906
-			 */
1907
-			if (!s->not_found && s->here->e_value_inum) {
1908
-				ea_ino = le32_to_cpu(s->here->e_value_inum);
1909
-				error = ext4_xattr_inode_iget(inode, ea_ino,
1910
-					      le32_to_cpu(s->here->e_hash),
1911
-					      &tmp_inode);
1912
-				if (error)
1913
-					goto cleanup;
1914
-
1915
-				if (!ext4_test_inode_state(tmp_inode,
1916
-						EXT4_STATE_LUSTRE_EA_INODE)) {
1917
-					/*
1918
-					 * Defer quota free call for previous
1919
-					 * inode until success is guaranteed.
1920
-					 */
1921
-					old_ea_inode_quota = le32_to_cpu(
1922
-							s->here->e_value_size);
1923
-				}
1924
-				iput(tmp_inode);
1925
-
1926
-				s->here->e_value_inum = 0;
1927
-				s->here->e_value_size = 0;
1953
+			if (!ext4_test_inode_state(tmp_inode,
1954
+					EXT4_STATE_LUSTRE_EA_INODE)) {
1955
+				/*
1956
+				 * Defer quota free call for previous
1957
+				 * inode until success is guaranteed.
1958
+				 */
1959
+				old_ea_inode_quota = le32_to_cpu(
1960
+						s->here->e_value_size);
19281961 			}
1962
+			iput(tmp_inode);
1963
+
1964
+			s->here->e_value_inum = 0;
1965
+			s->here->e_value_size = 0;
19291966 		}
19301967 	} else {
19311968 		/* Allocate a buffer where we construct the new block. */
....@@ -1976,8 +2013,9 @@
19762013 			else {
19772014 				u32 ref;
19782015 
2016
+#ifdef EXT4_XATTR_DEBUG
19792017 				WARN_ON_ONCE(dquot_initialize_needed(inode));
1980
-
2018
+#endif
19812019 				/* The old block is released after updating
19822020 				   the inode. */
19832021 				error = dquot_alloc_block(inode,
....@@ -1992,18 +2030,13 @@
19922030 				lock_buffer(new_bh);
19932031 				/*
19942032 				 * We have to be careful about races with
1995
-				 * freeing, rehashing or adding references to
1996
-				 * xattr block. Once we hold buffer lock xattr
1997
-				 * block's state is stable so we can check
1998
-				 * whether the block got freed / rehashed or
1999
-				 * not.  Since we unhash mbcache entry under
2000
-				 * buffer lock when freeing / rehashing xattr
2001
-				 * block, checking whether entry is still
2002
-				 * hashed is reliable. Same rules hold for
2003
-				 * e_reusable handling.
2033
+				 * adding references to xattr block. Once we
2034
+				 * hold buffer lock xattr block's state is
2035
+				 * stable so we can check the additional
2036
+				 * reference fits.
20042037 				 */
2005
-				if (hlist_bl_unhashed(&ce->e_hash_list) ||
2006
-				    !ce->e_reusable) {
2038
+				ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1;
2039
+				if (ref > EXT4_XATTR_REFCOUNT_MAX) {
20072040 					/*
20082041 					 * Undo everything and check mbcache
20092042 					 * again.
....@@ -2018,10 +2051,9 @@
20182051 					new_bh = NULL;
20192052 					goto inserted;
20202053 				}
2021
-				ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1;
20222054 				BHDR(new_bh)->h_refcount = cpu_to_le32(ref);
2023
-				if (ref >= EXT4_XATTR_REFCOUNT_MAX)
2024
-					ce->e_reusable = 0;
2055
+				if (ref == EXT4_XATTR_REFCOUNT_MAX)
2056
+					clear_bit(MBE_REUSABLE_B, &ce->e_flags);
20252057 				ea_bdebug(new_bh, "reusing; refcount now=%d",
20262058 					  ref);
20272059 				ext4_xattr_block_csum_set(inode, new_bh);
....@@ -2045,22 +2077,15 @@
20452077 			/* We need to allocate a new block */
20462078 			ext4_fsblk_t goal, block;
20472079 
2080
+#ifdef EXT4_XATTR_DEBUG
20482081 			WARN_ON_ONCE(dquot_initialize_needed(inode));
2049
-
2082
+#endif
20502083 			goal = ext4_group_first_block_no(sb,
20512084 						EXT4_I(inode)->i_block_group);
2052
-
2053
-			/* non-extent files can't have physical blocks past 2^32 */
2054
-			if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
2055
-				goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
2056
-
20572085 			block = ext4_new_meta_blocks(handle, inode, goal, 0,
20582086 						     NULL, &error);
20592087 			if (error)
20602088 				goto cleanup;
2061
-
2062
-			if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
2063
-				BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS);
20642089 
20652090 			ea_idebug(inode, "creating block %llu",
20662091 				  (unsigned long long)block);
....@@ -2189,7 +2214,7 @@
21892214 	return 0;
21902215 }
21912216 
2192
-int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
2217
+int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
21932218 				struct ext4_xattr_info *i,
21942219 				struct ext4_xattr_ibody_find *is)
21952220 {
....@@ -2200,30 +2225,6 @@
22002225 	if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
22012226 		return -ENOSPC;
22022227 
2203
-	error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */);
2204
-	if (error)
2205
-		return error;
2206
-	header = IHDR(inode, ext4_raw_inode(&is->iloc));
2207
-	if (!IS_LAST_ENTRY(s->first)) {
2208
-		header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC);
2209
-		ext4_set_inode_state(inode, EXT4_STATE_XATTR);
2210
-	} else {
2211
-		header->h_magic = cpu_to_le32(0);
2212
-		ext4_clear_inode_state(inode, EXT4_STATE_XATTR);
2213
-	}
2214
-	return 0;
2215
-}
2216
-
2217
-static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
2218
-				struct ext4_xattr_info *i,
2219
-				struct ext4_xattr_ibody_find *is)
2220
-{
2221
-	struct ext4_xattr_ibody_header *header;
2222
-	struct ext4_xattr_search *s = &is->s;
2223
-	int error;
2224
-
2225
-	if (EXT4_I(inode)->i_extra_isize == 0)
2226
-		return -ENOSPC;
22272228 	error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */);
22282229 	if (error)
22292230 		return error;
....@@ -2552,13 +2553,13 @@
25522553 		.in_inode = !!entry->e_value_inum,
25532554 	};
25542555 	struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode);
2556
+	int needs_kvfree = 0;
25552557 	int error;
25562558 
25572559 	is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
25582560 	bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
2559
-	buffer = kmalloc(value_size, GFP_NOFS);
25602561 	b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
2561
-	if (!is || !bs || !buffer || !b_entry_name) {
2562
+	if (!is || !bs || !b_entry_name) {
25622563 		error = -ENOMEM;
25632564 		goto out;
25642565 	}
....@@ -2570,12 +2571,18 @@
25702571 
25712572 	/* Save the entry name and the entry value */
25722573 	if (entry->e_value_inum) {
2574
+		buffer = kvmalloc(value_size, GFP_NOFS);
2575
+		if (!buffer) {
2576
+			error = -ENOMEM;
2577
+			goto out;
2578
+		}
2579
+		needs_kvfree = 1;
25732580 		error = ext4_xattr_inode_get(inode, entry, buffer, value_size);
25742581 		if (error)
25752582 			goto out;
25762583 	} else {
25772584 		size_t value_offs = le16_to_cpu(entry->e_value_offs);
2578
-		memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size);
2585
+		buffer = (void *)IFIRST(header) + value_offs;
25792586 	}
25802587 
25812588 	memcpy(b_entry_name, entry->e_name, entry->e_name_len);
....@@ -2590,25 +2597,26 @@
25902597 	if (error)
25912598 		goto out;
25922599 
2593
-	/* Remove the chosen entry from the inode */
2594
-	error = ext4_xattr_ibody_set(handle, inode, &i, is);
2595
-	if (error)
2596
-		goto out;
2597
-
25982600 	i.value = buffer;
25992601 	i.value_len = value_size;
26002602 	error = ext4_xattr_block_find(inode, &i, bs);
26012603 	if (error)
26022604 		goto out;
26032605 
2604
-	/* Add entry which was removed from the inode into the block */
2606
+	/* Move ea entry from the inode into the block */
26052607 	error = ext4_xattr_block_set(handle, inode, &i, bs);
26062608 	if (error)
26072609 		goto out;
2608
-	error = 0;
2610
+
2611
+	/* Remove the chosen entry from the inode */
2612
+	i.value = NULL;
2613
+	i.value_len = 0;
2614
+	error = ext4_xattr_ibody_set(handle, inode, &i, is);
2615
+
26092616 out:
26102617 	kfree(b_entry_name);
2611
-	kfree(buffer);
2618
+	if (needs_kvfree && buffer)
2619
+		kvfree(buffer);
26122620 	if (is)
26132621 		brelse(is->iloc.bh);
26142622 	if (bs)
....@@ -2783,6 +2791,9 @@
27832791 			(void *)header, total_ino);
27842792 	EXT4_I(inode)->i_extra_isize = new_extra_isize;
27852793 
2794
+	if (ext4_has_inline_data(inode))
2795
+		error = ext4_find_inline_data_nolock(inode);
2796
+
27862797 cleanup:
27872798 	if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) {
27882799 		ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",