--- /dev/null
+This patch implements the large EA support in ext4. If the size of
+an EA value is larger than the blocksize, then the EA value would
+not be saved in the external EA block, instead it would be saved
+in an external EA inode. So, the patch also helps support a larger
+number of EAs.
+
+Index: linux-stage/fs/ext4/ext4.h
+===================================================================
+--- linux-stage.orig/fs/ext4/ext4.h
++++ linux-stage/fs/ext4/ext4.h
+@@ -1579,6 +1579,7 @@ static inline void ext4_clear_state_flag
+ EXT4_FEATURE_INCOMPAT_EXTENTS| \
+ EXT4_FEATURE_INCOMPAT_64BIT| \
+ EXT4_FEATURE_INCOMPAT_FLEX_BG| \
++ EXT4_FEATURE_INCOMPAT_EA_INODE| \
+ EXT4_FEATURE_INCOMPAT_MMP | \
+ EXT4_FEATURE_INCOMPAT_DIRDATA| \
+ EXT4_FEATURE_INCOMPAT_INLINE_DATA)
+@@ -1979,6 +1980,12 @@ struct mmpd_data {
+ #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
+
+ /*
++ * Maximum size of xattr attributes for FEATURE_INCOMPAT_EA_INODE 1Mb
++ * This limit is arbitrary, but is reasonable for the xattr API.
++ */
++#define EXT4_XATTR_MAX_LARGE_EA_SIZE (1024 * 1024)
++
++/*
+ * Function prototypes
+ */
+
+@@ -1990,6 +1997,10 @@ struct mmpd_data {
+ # define ATTRIB_NORET __attribute__((noreturn))
+ # define NORET_AND noreturn,
+
++struct ext4_xattr_ino_array {
++ unsigned int xia_count; /* # of used item in the array */
++ unsigned int xia_inodes[0];
++};
+ /* bitmap.c */
+ extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
+ void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
+@@ -2194,6 +2205,7 @@ extern void ext4_set_inode_flags(struct
+ extern void ext4_get_inode_flags(struct ext4_inode_info *);
+ extern int ext4_alloc_da_blocks(struct inode *inode);
+ extern void ext4_set_aops(struct inode *inode);
++extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int chunk);
+ extern int ext4_writepage_trans_blocks(struct inode *);
+ extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
+ extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
+Index: linux-stage/fs/ext4/inode.c
+===================================================================
+--- linux-stage.orig/fs/ext4/inode.c
++++ linux-stage/fs/ext4/inode.c
+@@ -134,8 +134,6 @@ static void ext4_invalidatepage(struct p
+ unsigned int length);
+ static int __ext4_journalled_writepage(struct page *page, unsigned int len);
+ static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh);
+-static int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
+- int pextents);
+
+ /*
+ * Test whether an inode is a fast symlink.
+@@ -184,6 +182,8 @@ void ext4_evict_inode(struct inode *inod
+ {
+ handle_t *handle;
+ int err;
++ int extra_credits = 3;
++ struct ext4_xattr_ino_array *lea_ino_array = NULL;
+
+ trace_ext4_evict_inode(inode);
+
+@@ -236,8 +236,8 @@ void ext4_evict_inode(struct inode *inod
+ * protection against it
+ */
+ sb_start_intwrite(inode->i_sb);
+- handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE,
+- ext4_blocks_for_truncate(inode)+3);
++
++ handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, extra_credits);
+ if (IS_ERR(handle)) {
+ ext4_std_error(inode->i_sb, PTR_ERR(handle));
+ /*
+@@ -249,9 +249,36 @@ void ext4_evict_inode(struct inode *inod
+ sb_end_intwrite(inode->i_sb);
+ goto no_delete;
+ }
+-
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
++
++ /*
++ * Delete xattr inode before deleting the main inode.
++ */
++ err = ext4_xattr_delete_inode(handle, inode, &lea_ino_array);
++ if (err) {
++ ext4_warning(inode->i_sb,
++ "couldn't delete inode's xattr (err %d)", err);
++ goto stop_handle;
++ }
++
++ if (!IS_NOQUOTA(inode))
++ extra_credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb);
++
++ if (!ext4_handle_has_enough_credits(handle,
++ ext4_blocks_for_truncate(inode) + extra_credits)) {
++ err = ext4_journal_extend(handle,
++ ext4_blocks_for_truncate(inode) + extra_credits);
++ if (err > 0)
++ err = ext4_journal_restart(handle,
++ ext4_blocks_for_truncate(inode) + extra_credits);
++ if (err != 0) {
++ ext4_warning(inode->i_sb,
++ "couldn't extend journal (err %d)", err);
++ goto stop_handle;
++ }
++ }
++
+ inode->i_size = 0;
+ err = ext4_mark_inode_dirty(handle, inode);
+ if (err) {
+@@ -306,8 +333,12 @@ void ext4_evict_inode(struct inode *inod
+ ext4_clear_inode(inode);
+ else
+ ext4_free_inode(handle, inode);
++
+ ext4_journal_stop(handle);
+ sb_end_intwrite(inode->i_sb);
++
++ if (lea_ino_array != NULL)
++ ext4_xattr_inode_array_free(inode, lea_ino_array);
+ return;
+ no_delete:
+ ext4_clear_inode(inode); /* We must guarantee clearing of inode... */
+@@ -4681,7 +4712,7 @@ static int ext4_index_trans_blocks(struc
+ *
+ * Also account for superblock, inode, quota and xattr blocks
+ */
+-static int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
++int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
+ int pextents)
+ {
+ ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb);
+Index: linux-stage/fs/ext4/xattr.c
+===================================================================
+--- linux-stage.orig/fs/ext4/xattr.c
++++ linux-stage/fs/ext4/xattr.c
+@@ -201,6 +201,7 @@ ext4_xattr_check_names(struct ext4_xattr
+
+ while (!IS_LAST_ENTRY(entry)) {
+ if (entry->e_value_size != 0 &&
++ entry->e_value_inum == 0 &&
+ (value_start + le16_to_cpu(entry->e_value_offs) <
+ (void *)e + sizeof(__u32) ||
+ value_start + le16_to_cpu(entry->e_value_offs) +
+@@ -233,19 +234,26 @@ ext4_xattr_check_block(struct inode *ino
+ }
+
+ static inline int
+-ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size)
++ext4_xattr_check_entry(struct ext4_xattr_entry *entry, size_t size,
++ struct inode *inode)
+ {
+ size_t value_size = le32_to_cpu(entry->e_value_size);
+
+- if (entry->e_value_block != 0 || value_size > size ||
++ if (!entry->e_value_inum &&
+ le16_to_cpu(entry->e_value_offs) + value_size > size)
++ return -EIO;
++ if (entry->e_value_inum &&
++ (le32_to_cpu(entry->e_value_inum) < EXT4_FIRST_INO(inode->i_sb) ||
++ le32_to_cpu(entry->e_value_inum) >
++ le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_inodes_count)))
+ return -EIO;
+ return 0;
+ }
+
+ static int
+ ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index,
+- const char *name, size_t size, int sorted)
++ const char *name, size_t size, int sorted,
++ struct inode *inode)
+ {
+ struct ext4_xattr_entry *entry;
+ size_t name_len;
+@@ -265,11 +273,104 @@ ext4_xattr_find_entry(struct ext4_xattr_
+ break;
+ }
+ *pentry = entry;
+- if (!cmp && ext4_xattr_check_entry(entry, size))
++ if (!cmp && ext4_xattr_check_entry(entry, size, inode))
+ return -EIO;
+ return cmp ? -ENODATA : 0;
+ }
+
++/*
++ * Read the EA value from an inode.
++ */
++static int
++ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t *size)
++{
++ unsigned long block = 0;
++ struct buffer_head *bh = NULL;
++ int err, blocksize;
++ size_t csize, ret_size = 0;
++
++ if (*size == 0)
++ return 0;
++
++ blocksize = ea_inode->i_sb->s_blocksize;
++
++ while (ret_size < *size) {
++ csize = (*size - ret_size) > blocksize ? blocksize :
++ *size - ret_size;
++ bh = ext4_bread(NULL, ea_inode, block, 0, &err);
++ if (!bh) {
++ *size = ret_size;
++ return err;
++ }
++ memcpy(buf, bh->b_data, csize);
++ brelse(bh);
++
++ buf += csize;
++ block += 1;
++ ret_size += csize;
++ }
++
++ *size = ret_size;
++
++ return err;
++}
++
++struct inode *ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, int *err)
++{
++ struct inode *ea_inode = NULL;
++
++ ea_inode = ext4_iget(parent->i_sb, ea_ino);
++ if (IS_ERR(ea_inode) || is_bad_inode(ea_inode)) {
++ int rc = IS_ERR(ea_inode) ? PTR_ERR(ea_inode) : 0;
++ ext4_error(parent->i_sb, "error while reading EA inode %lu "
++ "/ %d %d", ea_ino, rc, is_bad_inode(ea_inode));
++ *err = rc != 0 ? rc : -EIO;
++ return NULL;
++ }
++
++ if (ea_inode->i_xattr_inode_parent != parent->i_ino ||
++ ea_inode->i_generation != parent->i_generation) {
++ ext4_error(parent->i_sb, "Backpointer from EA inode %lu "
++ "to parent invalid.", ea_ino);
++ *err = -EINVAL;
++ goto error;
++ }
++
++ if (!(EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL)) {
++ ext4_error(parent->i_sb, "EA inode %lu does not have "
++ "EXT4_EA_INODE_FL flag set.\n", ea_ino);
++ *err = -EINVAL;
++ goto error;
++ }
++
++ *err = 0;
++ return ea_inode;
++
++error:
++ iput(ea_inode);
++ return NULL;
++}
++
++/*
++ * Read the value from the EA inode.
++ */
++static int
++ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer,
++ size_t *size)
++{
++ struct inode *ea_inode = NULL;
++ int err;
++
++ ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err);
++ if (err)
++ return err;
++
++ err = ext4_xattr_inode_read(ea_inode, buffer, size);
++ iput(ea_inode);
++
++ return err;
++}
++
+ static int
+ ext4_xattr_block_get(struct inode *inode, int name_index, const char *name,
+ void *buffer, size_t buffer_size)
+@@ -301,7 +401,8 @@ bad_block:
+ }
+ ext4_xattr_cache_insert(bh);
+ entry = BFIRST(bh);
+- error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1);
++ error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1,
++ inode);
+ if (error == -EIO)
+ goto bad_block;
+ if (error)
+@@ -311,8 +412,16 @@ bad_block:
+ error = -ERANGE;
+ if (size > buffer_size)
+ goto cleanup;
+- memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs),
+- size);
++ if (entry->e_value_inum) {
++ error = ext4_xattr_inode_get(inode,
++ le32_to_cpu(entry->e_value_inum),
++ buffer, &size);
++ if (error)
++ goto cleanup;
++ } else {
++ memcpy(buffer, bh->b_data +
++ le16_to_cpu(entry->e_value_offs), size);
++ }
+ }
+ error = size;
+
+@@ -346,7 +455,7 @@ ext4_xattr_ibody_get(struct inode *inode
+ if (error)
+ goto cleanup;
+ error = ext4_xattr_find_entry(&entry, name_index, name,
+- end - (void *)entry, 0);
++ end - (void *)entry, 0, inode);
+ if (error)
+ goto cleanup;
+ size = le32_to_cpu(entry->e_value_size);
+@@ -354,8 +463,16 @@ ext4_xattr_ibody_get(struct inode *inode
+ error = -ERANGE;
+ if (size > buffer_size)
+ goto cleanup;
+- memcpy(buffer, (void *)IFIRST(header) +
+- le16_to_cpu(entry->e_value_offs), size);
++ if (entry->e_value_inum) {
++ error = ext4_xattr_inode_get(inode,
++ le32_to_cpu(entry->e_value_inum),
++ buffer, &size);
++ if (error)
++ goto cleanup;
++ } else {
++ memcpy(buffer, (void *)IFIRST(header) +
++ le16_to_cpu(entry->e_value_offs), size);
++ }
+ }
+ error = size;
+
+@@ -600,7 +717,7 @@ static size_t ext4_xattr_free_space(stru
+ size_t *min_offs, void *base, int *total)
+ {
+ for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
+- if (!last->e_value_block && last->e_value_size) {
++ if (!last->e_value_inum && last->e_value_size) {
+ size_t offs = le16_to_cpu(last->e_value_offs);
+ if (offs < *min_offs)
+ *min_offs = offs;
+@@ -611,16 +728,174 @@ static size_t ext4_xattr_free_space(stru
+ return (*min_offs - ((void *)last - base) - sizeof(__u32));
+ }
+
++/*
++ * Write the value of the EA in an inode.
++ */
+ static int
+-ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
++ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode,
++ const void *buf, int bufsize)
++{
++ struct buffer_head *bh = NULL;
++ unsigned long block = 0;
++ unsigned blocksize = ea_inode->i_sb->s_blocksize;
++ unsigned max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits;
++ int csize, wsize = 0;
++ int ret = 0;
++ int retries = 0;
++
++retry:
++ while (ret >= 0 && ret < max_blocks) {
++ struct ext4_map_blocks map;
++ map.m_lblk = block += ret;
++ map.m_len = max_blocks -= ret;
++
++ ret = ext4_map_blocks(handle, ea_inode, &map,
++ EXT4_GET_BLOCKS_CREATE);
++ if (ret <= 0) {
++ ext4_mark_inode_dirty(handle, ea_inode);
++ if (ret == -ENOSPC &&
++ ext4_should_retry_alloc(ea_inode->i_sb, &retries)) {
++ ret = 0;
++ goto retry;
++ }
++ break;
++ }
++ }
++
++ if (ret < 0)
++ return ret;
++
++ block = 0;
++ while (wsize < bufsize) {
++ if (bh != NULL)
++ brelse(bh);
++ csize = (bufsize - wsize) > blocksize ? blocksize :
++ bufsize - wsize;
++ bh = ext4_getblk(handle, ea_inode, block, 0, &ret);
++ if (!bh)
++ goto out;
++ ret = ext4_journal_get_write_access(handle, bh);
++ if (ret)
++ goto out;
++
++ memcpy(bh->b_data, buf, csize);
++ set_buffer_uptodate(bh);
++ ext4_handle_dirty_metadata(handle, ea_inode, bh);
++
++ buf += csize;
++ wsize += csize;
++ block += 1;
++ }
++
++ mutex_lock(&ea_inode->i_mutex);
++ i_size_write(ea_inode, wsize);
++ ext4_update_i_disksize(ea_inode, wsize);
++ mutex_unlock(&ea_inode->i_mutex);
++
++ ext4_mark_inode_dirty(handle, ea_inode);
++
++out:
++ brelse(bh);
++
++ return ret;
++}
++
++/*
++ * Create an inode to store the value of a large EA.
++ */
++static struct inode *
++ext4_xattr_inode_create(handle_t *handle, struct inode *inode)
++{
++ struct inode *ea_inode = NULL;
++
++ /*
++ * Let the next inode be the goal, so we try and allocate the EA inode
++ * in the same group, or nearby one.
++ */
++ ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
++ S_IFREG|0600, NULL, inode->i_ino + 1, NULL);
++
++ if (!IS_ERR(ea_inode)) {
++ ea_inode->i_op = &ext4_file_inode_operations;
++ ea_inode->i_fop = &ext4_file_operations;
++ ext4_set_aops(ea_inode);
++ ea_inode->i_generation = inode->i_generation;
++ EXT4_I(ea_inode)->i_flags |= EXT4_EA_INODE_FL;
++
++ /*
++ * A back-pointer from EA inode to parent inode will be useful
++ * for e2fsck.
++ */
++ ea_inode->i_xattr_inode_parent = inode->i_ino;
++ unlock_new_inode(ea_inode);
++ }
++
++ return ea_inode;
++}
++
++/*
++ * Unlink the inode storing the value of the EA.
++ */
++int
++ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino)
++{
++ struct inode *ea_inode = NULL;
++ int err;
++
++ ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err);
++ if (err)
++ return err;
++
++ clear_nlink(ea_inode);
++ iput(ea_inode);
++
++ return 0;
++}
++
++/*
++ * Add value of the EA in an inode.
++ */
++static int
++ext4_xattr_inode_set(handle_t *handle, struct inode *inode, unsigned long *ea_ino,
++ const void *value, size_t value_len)
++{
++ struct inode *ea_inode = NULL;
++ int err;
++
++ /* Create an inode for the EA value */
++ ea_inode = ext4_xattr_inode_create(handle, inode);
++ if (IS_ERR(ea_inode))
++ return -1;
++
++ err = ext4_xattr_inode_write(handle, ea_inode, value, value_len);
++ if (err)
++ clear_nlink(ea_inode);
++ else
++ *ea_ino = ea_inode->i_ino;
++
++ iput(ea_inode);
++
++ return err;
++}
++
++static int
++ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s,
++ handle_t *handle, struct inode *inode)
+ {
+ struct ext4_xattr_entry *last;
+ size_t free, min_offs = s->end - s->base, name_len = strlen(i->name);
++ int in_inode = i->in_inode;
++
++ if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
++ EXT4_FEATURE_INCOMPAT_EA_INODE) &&
++ (EXT4_XATTR_SIZE(i->value_len) >
++ EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize)))
++ in_inode = 1;
+
+ /* Compute min_offs and last. */
+ last = s->first;
+ for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
+- if (!last->e_value_block && last->e_value_size) {
++ if (!last->e_value_inum && last->e_value_size) {
+ size_t offs = le16_to_cpu(last->e_value_offs);
+ if (offs < min_offs)
+ min_offs = offs;
+@@ -628,15 +903,21 @@ ext4_xattr_set_entry(struct ext4_xattr_i
+ }
+ free = min_offs - ((void *)last - s->base) - sizeof(__u32);
+ if (!s->not_found) {
+- if (!s->here->e_value_block && s->here->e_value_size) {
++ if (!in_inode &&
++ !s->here->e_value_inum && s->here->e_value_size) {
+ size_t size = le32_to_cpu(s->here->e_value_size);
+ free += EXT4_XATTR_SIZE(size);
+ }
+ free += EXT4_XATTR_LEN(name_len);
+ }
+ if (i->value) {
+- if (free < EXT4_XATTR_LEN(name_len) +
+- EXT4_XATTR_SIZE(i->value_len))
++ size_t value_len = EXT4_XATTR_SIZE(i->value_len);
++
++ if (in_inode)
++ value_len = 0;
++
++ if (free < value_len ||
++ free < EXT4_XATTR_LEN(name_len) + value_len)
+ return -ENOSPC;
+ }
+
+@@ -651,7 +931,8 @@ ext4_xattr_set_entry(struct ext4_xattr_i
+ s->here->e_name_len = name_len;
+ memcpy(s->here->e_name, i->name, name_len);
+ } else {
+- if (!s->here->e_value_block && s->here->e_value_size) {
++ if (!s->here->e_value_inum && s->here->e_value_size &&
++ s->here->e_value_offs > 0) {
+ void *first_val = s->base + min_offs;
+ size_t offs = le16_to_cpu(s->here->e_value_offs);
+ void *val = s->base + offs;
+@@ -685,13 +966,18 @@ ext4_xattr_set_entry(struct ext4_xattr_i
+ last = s->first;
+ while (!IS_LAST_ENTRY(last)) {
+ size_t o = le16_to_cpu(last->e_value_offs);
+- if (!last->e_value_block &&
++ if (!last->e_value_inum &&
+ last->e_value_size && o < offs)
+ last->e_value_offs =
+ cpu_to_le16(o + size);
+ last = EXT4_XATTR_NEXT(last);
+ }
+ }
++ if (s->here->e_value_inum) {
++ ext4_xattr_inode_unlink(inode,
++ le32_to_cpu(s->here->e_value_inum));
++ s->here->e_value_inum = 0;
++ }
+ if (!i->value) {
+ /* Remove the old name. */
+ size_t size = EXT4_XATTR_LEN(name_len);
+@@ -705,10 +990,17 @@ ext4_xattr_set_entry(struct ext4_xattr_i
+ if (i->value) {
+ /* Insert the new value. */
+ s->here->e_value_size = cpu_to_le32(i->value_len);
+- if (i->value_len) {
++ if (in_inode) {
++ unsigned long ea_ino = le32_to_cpu(s->here->e_value_inum);
++ ext4_xattr_inode_set(handle, inode, &ea_ino, i->value,
++ i->value_len);
++ s->here->e_value_inum = cpu_to_le32(ea_ino);
++ s->here->e_value_offs = 0;
++ } else if (i->value_len) {
+ size_t size = EXT4_XATTR_SIZE(i->value_len);
+ void *val = s->base + min_offs - size;
+ s->here->e_value_offs = cpu_to_le16(min_offs - size);
++ s->here->e_value_inum = 0;
+ if (i->value == EXT4_ZERO_XATTR_VALUE) {
+ memset(val, 0, size);
+ } else {
+@@ -758,7 +1050,7 @@ ext4_xattr_block_find(struct inode *inod
+ bs->s.end = bs->bh->b_data + bs->bh->b_size;
+ bs->s.here = bs->s.first;
+ error = ext4_xattr_find_entry(&bs->s.here, i->name_index,
+- i->name, bs->bh->b_size, 1);
++ i->name, bs->bh->b_size, 1, inode);
+ if (error && error != -ENODATA)
+ goto cleanup;
+ bs->s.not_found = error;
+@@ -782,8 +1074,6 @@ ext4_xattr_block_set(handle_t *handle, s
+
+ #define header(x) ((struct ext4_xattr_header *)(x))
+
+- if (i->value && i->value_len > sb->s_blocksize)
+- return -ENOSPC;
+ if (s->base) {
+ ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev,
+ bs->bh->b_blocknr);
+@@ -799,7 +1089,7 @@ ext4_xattr_block_set(handle_t *handle, s
+ ce = NULL;
+ }
+ ea_bdebug(bs->bh, "modifying in-place");
+- error = ext4_xattr_set_entry(i, s);
++ error = ext4_xattr_set_entry(i, s, handle, inode);
+ if (!error) {
+ if (!IS_LAST_ENTRY(s->first))
+ ext4_xattr_rehash(header(s->base),
+@@ -850,7 +1140,7 @@ ext4_xattr_block_set(handle_t *handle, s
+ s->end = s->base + sb->s_blocksize;
+ }
+
+- error = ext4_xattr_set_entry(i, s);
++ error = ext4_xattr_set_entry(i, s, handle, inode);
+ if (error == -EIO)
+ goto bad_block;
+ if (error)
+@@ -1000,7 +1290,7 @@ int ext4_xattr_ibody_find(struct inode *
+ /* Find the named attribute. */
+ error = ext4_xattr_find_entry(&is->s.here, i->name_index,
+ i->name, is->s.end -
+- (void *)is->s.base, 0);
++ (void *)is->s.base, 0, inode);
+ if (error && error != -ENODATA)
+ return error;
+ is->s.not_found = error;
+@@ -1018,7 +1308,7 @@ int ext4_xattr_ibody_inline_set(handle_t
+
+ if (EXT4_I(inode)->i_extra_isize == 0)
+ return -ENOSPC;
+- error = ext4_xattr_set_entry(i, s);
++ error = ext4_xattr_set_entry(i, s, handle, inode);
+ if (error) {
+ if (error == -ENOSPC &&
+ ext4_has_inline_data(inode)) {
+@@ -1030,7 +1320,7 @@ int ext4_xattr_ibody_inline_set(handle_t
+ error = ext4_xattr_ibody_find(inode, i, is);
+ if (error)
+ return error;
+- error = ext4_xattr_set_entry(i, s);
++ error = ext4_xattr_set_entry(i, s, handle, inode);
+ }
+ if (error)
+ return error;
+@@ -1056,7 +1346,7 @@ static int ext4_xattr_ibody_set(handle_t
+
+ if (EXT4_I(inode)->i_extra_isize == 0)
+ return -ENOSPC;
+- error = ext4_xattr_set_entry(i, s);
++ error = ext4_xattr_set_entry(i, s, handle, inode);
+ if (error)
+ return error;
+ header = IHDR(inode, ext4_raw_inode(&is->iloc));
+@@ -1092,7 +1382,7 @@ ext4_xattr_set_handle(handle_t *handle,
+ .name = name,
+ .value = value,
+ .value_len = value_len,
+-
++ .in_inode = 0,
+ };
+ struct ext4_xattr_ibody_find is = {
+ .s = { .not_found = -ENODATA, },
+@@ -1157,6 +1447,15 @@ ext4_xattr_set_handle(handle_t *handle,
+ goto cleanup;
+ }
+ error = ext4_xattr_block_set(handle, inode, &i, &bs);
++ if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
++ EXT4_FEATURE_INCOMPAT_EA_INODE) &&
++ error == -ENOSPC) {
++ /* xattr not fit to block, store at external
++ * inode */
++ i.in_inode = 1;
++ error = ext4_xattr_ibody_set(handle, inode,
++ &i, &is);
++ }
+ if (error)
+ goto cleanup;
+ if (!is.s.not_found) {
+@@ -1203,9 +1502,22 @@ ext4_xattr_set(struct inode *inode, int
+ const void *value, size_t value_len, int flags)
+ {
+ handle_t *handle;
++ struct super_block *sb = inode->i_sb;
+ int error, retries = 0;
+ int credits = ext4_jbd2_credits_xattr(inode);
+
++ if ((value_len >= EXT4_XATTR_MIN_LARGE_EA_SIZE(sb->s_blocksize)) &&
++ EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EA_INODE)) {
++ int nrblocks = (value_len + sb->s_blocksize - 1) >>
++ sb->s_blocksize_bits;
++
++ /* For new inode */
++ credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3;
++
++ /* For data blocks of EA inode */
++ credits += ext4_meta_trans_blocks(inode, nrblocks, 0);
++ }
++
+ retry:
+ handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits);
+ if (IS_ERR(handle)) {
+@@ -1217,7 +1529,7 @@ retry:
+ value, value_len, flags);
+ error2 = ext4_journal_stop(handle);
+ if (error == -ENOSPC &&
+- ext4_should_retry_alloc(inode->i_sb, &retries))
++ ext4_should_retry_alloc(sb, &retries))
+ goto retry;
+ if (error == 0)
+ error = error2;
+@@ -1239,7 +1551,7 @@ static void ext4_xattr_shift_entries(str
+
+ /* Adjust the value offsets of the entries */
+ for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
+- if (!last->e_value_block && last->e_value_size) {
++ if (!last->e_value_inum && last->e_value_size) {
+ new_offs = le16_to_cpu(last->e_value_offs) +
+ value_offs_shift;
+ BUG_ON(new_offs + le32_to_cpu(last->e_value_size)
+@@ -1477,21 +1789,135 @@ cleanup:
+ }
+
+
++#define EIA_INCR 16 /* must be 2^n */
++#define EIA_MASK (EIA_INCR - 1)
++/* Add the large xattr @ino into @lea_ino_array for later deletion.
++ * If @lea_ino_array is new or full it will be grown and the old
++ * contents copied over.
++ */
++static int
++ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino)
++{
++ if (*lea_ino_array == NULL) {
++ /*
++ * Start with 15 inodes, so it fits into a power-of-two size.
++ * If *lea_ino_array is NULL, this is essentially offsetof()
++ */
++ (*lea_ino_array) =
++ kmalloc(offsetof(struct ext4_xattr_ino_array,
++ xia_inodes[EIA_MASK]),
++ GFP_NOFS);
++ if (*lea_ino_array == NULL)
++ return -ENOMEM;
++ (*lea_ino_array)->xia_count = 0;
++ } else if (((*lea_ino_array)->xia_count & EIA_MASK) == EIA_MASK) {
++ /* expand the array once all 15 + n * 16 slots are full */
++ struct ext4_xattr_ino_array *new_array = NULL;
++ int count = (*lea_ino_array)->xia_count;
++
++ /* if new_array is NULL, this is essentially offsetof() */
++ new_array = kmalloc(
++ offsetof(struct ext4_xattr_ino_array,
++ xia_inodes[count + EIA_INCR]),
++ GFP_NOFS);
++ if (new_array == NULL)
++ return -ENOMEM;
++ memcpy(new_array, *lea_ino_array,
++ offsetof(struct ext4_xattr_ino_array,
++ xia_inodes[count]));
++ kfree(*lea_ino_array);
++ *lea_ino_array = new_array;
++ }
++ (*lea_ino_array)->xia_inodes[(*lea_ino_array)->xia_count++] = ino;
++ 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_ino_array *lea_ino_array)
++{
++ struct inode *ea_inode = NULL;
++ int idx = 0, error = 0;
++
++ if (lea_ino_array == NULL)
++ return 0;
++
++ for (; idx < lea_ino_array->xia_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 = ext4_xattr_inode_iget(inode,
++ lea_ino_array->xia_inodes[idx], &error);
++ if (error)
++ continue;
++ ext4_orphan_add(handle, ea_inode);
++ /* the inode's i_count will be released by caller */
++ }
++
++ return 0;
++}
+
+ /*
+ * ext4_xattr_delete_inode()
+ *
+- * Free extended attribute resources associated with this inode. This
++ * Free extended attribute resources associated with this inode. Traverse
++ * all entries and unlink any xattr inodes associated with this inode. This
+ * is called immediately before an inode is freed. We have exclusive
+- * access to the inode.
++ * access to the inode. If an orphan inode is deleted it will also delete any
++ * xattr block and all xattr inodes. They are checked by ext4_xattr_inode_iget()
++ * to ensure they belong to the parent inode and were not deleted already.
+ */
+-void
+-ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
++int
++ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
++ struct ext4_xattr_ino_array **lea_ino_array)
+ {
+ 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;
++ int credits = 3, error = 0;
+
+- if (!EXT4_I(inode)->i_file_acl)
++ if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
++ goto delete_external_ea;
++
++ error = ext4_get_inode_loc(inode, &iloc);
++ 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;
++ if (ext4_expand_ino_array(lea_ino_array,
++ entry->e_value_inum) != 0) {
++ brelse(iloc.bh);
++ goto cleanup;
++ }
++ entry->e_value_inum = 0;
++ }
++ brelse(iloc.bh);
++
++delete_external_ea:
++ if (!EXT4_I(inode)->i_file_acl) {
++ /* add xattr inode to orphan list */
++ ext4_xattr_inode_orphan_add(handle, inode, credits,
++ *lea_ino_array);
++ goto cleanup;
++ }
+ bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl);
+ if (!bh) {
+ EXT4_ERROR_INODE(inode, "block %llu read error",
+@@ -1504,11 +1930,69 @@ ext4_xattr_delete_inode(handle_t *handle
+ EXT4_I(inode)->i_file_acl);
+ goto cleanup;
+ }
++
++ for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
++ entry = EXT4_XATTR_NEXT(entry)) {
++ if (!entry->e_value_inum)
++ continue;
++ if (ext4_expand_ino_array(lea_ino_array,
++ entry->e_value_inum) != 0)
++ goto cleanup;
++ entry->e_value_inum = 0;
++ }
++
++ /* add xattr inode to orphan list */
++ error = ext4_xattr_inode_orphan_add(handle, inode, credits,
++ *lea_ino_array);
++ if (error != 0)
++ 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 (error != 0) {
++ ext4_warning(inode->i_sb,
++ "couldn't extend journal (err %d)", error);
++ goto cleanup;
++ }
++ }
++
+ ext4_xattr_release_block(handle, inode, bh);
+ EXT4_I(inode)->i_file_acl = 0;
+
+ cleanup:
+ brelse(bh);
++
++ return error;
++}
++
++void
++ext4_xattr_inode_array_free(struct inode *inode,
++ struct ext4_xattr_ino_array *lea_ino_array)
++{
++ struct inode *ea_inode = NULL;
++ int idx = 0;
++ int err;
++
++ if (lea_ino_array == NULL)
++ return;
++
++ for (; idx < lea_ino_array->xia_count; ++idx) {
++ ea_inode = ext4_xattr_inode_iget(inode,
++ lea_ino_array->xia_inodes[idx], &err);
++ if (err)
++ continue;
++ /* for inode's i_count get from ext4_xattr_delete_inode */
++ if (!list_empty(&EXT4_I(ea_inode)->i_orphan))
++ iput(ea_inode);
++ clear_nlink(ea_inode);
++ iput(ea_inode);
++ }
++ kfree(lea_ino_array);
+ }
+
+ /*
+@@ -1578,10 +2062,9 @@ ext4_xattr_cmp(struct ext4_xattr_header
+ entry1->e_name_index != entry2->e_name_index ||
+ entry1->e_name_len != entry2->e_name_len ||
+ entry1->e_value_size != entry2->e_value_size ||
++ entry1->e_value_inum != entry2->e_value_inum ||
+ memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len))
+ return 1;
+- if (entry1->e_value_block != 0 || entry2->e_value_block != 0)
+- return -EIO;
+ if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs),
+ (char *)header2 + le16_to_cpu(entry2->e_value_offs),
+ le32_to_cpu(entry1->e_value_size)))
+@@ -1665,7 +2148,7 @@ static inline void ext4_xattr_hash_entry
+ *name++;
+ }
+
+- if (entry->e_value_block == 0 && entry->e_value_size != 0) {
++ if (!entry->e_value_inum && entry->e_value_size) {
+ __le32 *value = (__le32 *)((char *)header +
+ le16_to_cpu(entry->e_value_offs));
+ for (n = (le32_to_cpu(entry->e_value_size) +
+Index: linux-stage/fs/ext4/xattr.h
+===================================================================
+--- linux-stage.orig/fs/ext4/xattr.h
++++ linux-stage/fs/ext4/xattr.h
+@@ -42,7 +42,7 @@ struct ext4_xattr_entry {
+ __u8 e_name_len; /* length of name */
+ __u8 e_name_index; /* attribute name index */
+ __le16 e_value_offs; /* offset in disk block of value */
+- __le32 e_value_block; /* disk block attribute is stored on (n/i) */
++ __le32 e_value_inum; /* inode in which the value is stored */
+ __le32 e_value_size; /* size of attribute value */
+ __le32 e_hash; /* hash value of name and value */
+ char e_name[0]; /* attribute name */
+@@ -67,6 +67,15 @@ struct ext4_xattr_entry {
+ EXT4_I(inode)->i_extra_isize))
+ #define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
+
++#define i_xattr_inode_parent i_mtime.tv_sec
++
++/*
++ * The minimum size of EA value when you start storing it in an external inode
++ * size of block - size of header - size of 1 entry - 4 null bytes
++*/
++#define EXT4_XATTR_MIN_LARGE_EA_SIZE(b) \
++ ((b) - EXT4_XATTR_LEN(3) - sizeof(struct ext4_xattr_header) - 4)
++
+ #define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
+ #define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
+ #define BFIRST(bh) ENTRY(BHDR(bh)+1)
+@@ -75,10 +84,11 @@ struct ext4_xattr_entry {
+ #define EXT4_ZERO_XATTR_VALUE ((void *)-1)
+
+ struct ext4_xattr_info {
+- int name_index;
+ const char *name;
+ const void *value;
+ size_t value_len;
++ int name_index;
++ int in_inode;
+ };
+
+ struct ext4_xattr_search {
+@@ -106,7 +116,13 @@ extern int ext4_xattr_get(struct inode *
+ extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
+ extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
+
+-extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
++extern struct inode *ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino,
++ int *err);
++extern int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino);
++extern int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
++ struct ext4_xattr_ino_array **array);
++extern void ext4_xattr_inode_array_free(struct inode *inode,
++ struct ext4_xattr_ino_array *array);
+ extern void ext4_xattr_put_super(struct super_block *);
+
+ extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
+Index: linux-stage/fs/ext4/ialloc.c
+===================================================================
+--- linux-stage.orig/fs/ext4/ialloc.c
++++ linux-stage/fs/ext4/ialloc.c
+@@ -269,7 +269,6 @@ void ext4_free_inode(handle_t *handle, s
+ * as writing the quota to disk may need the lock as well.
+ */
+ dquot_initialize(inode);
+- ext4_xattr_delete_inode(handle, inode);
+ dquot_free_inode(inode);
+ dquot_drop(inode);
+
+Index: linux-stage/fs/ext4/inline.c
+===================================================================
+--- linux-stage.orig/fs/ext4/inline.c
++++ linux-stage/fs/ext4/inline.c
+@@ -59,7 +59,7 @@ static int get_max_inline_xattr_value_si
+
+ /* Compute min_offs. */
+ for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
+- if (!entry->e_value_block && entry->e_value_size) {
++ if (!entry->e_value_inum && entry->e_value_size) {
+ size_t offs = le16_to_cpu(entry->e_value_offs);
+ if (offs < min_offs)
+ min_offs = offs;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff