1 files changed, 151 insertions, 107 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index aabbb3f53683..1c94cca35ed1 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1177,7 +1177,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
                   le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
                   ext4_idx_pblock(EXT_FIRST_INDEX(neh)));
 
-        neh->eh_depth = cpu_to_le16(le16_to_cpu(neh->eh_depth) + 1);
+        le16_add_cpu(&neh->eh_depth, 1);
         ext4_mark_inode_dirty(handle, inode);
 out:
         brelse(bh);
@@ -1656,16 +1656,60 @@ static int ext4_ext_try_to_merge_right(struct inode *inode,
 }
 
 /*
+ * This function does a very simple check to see if we can collapse
+ * an extent tree with a single extent tree leaf block into the inode.
+ */
+static void ext4_ext_try_to_merge_up(handle_t *handle,
+                                     struct inode *inode,
+                                     struct ext4_ext_path *path)
+{
+        size_t s;
+        unsigned max_root = ext4_ext_space_root(inode, 0);
+        ext4_fsblk_t blk;
+
+        if ((path[0].p_depth != 1) ||
+            (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) ||
+            (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root))
+                return;
+
+        /*
+         * We need to modify the block allocation bitmap and the block
+         * group descriptor to release the extent tree block.  If we
+         * can't get the journal credits, give up.
+         */
+        if (ext4_journal_extend(handle, 2))
+                return;
+
+        /*
+         * Copy the extent data up to the inode
+         */
+        blk = ext4_idx_pblock(path[0].p_idx);
+        s = le16_to_cpu(path[1].p_hdr->eh_entries) *
+                sizeof(struct ext4_extent_idx);
+        s += sizeof(struct ext4_extent_header);
+
+        memcpy(path[0].p_hdr, path[1].p_hdr, s);
+        path[0].p_depth = 0;
+        path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
+                (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr));
+        path[0].p_hdr->eh_max = cpu_to_le16(max_root);
+
+        brelse(path[1].p_bh);
+        ext4_free_blocks(handle, inode, NULL, blk, 1,
+                         EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
+}
+
+/*
  * This function tries to merge the @ex extent to neighbours in the tree.
  * return 1 if merge left else 0.
  */
-static int ext4_ext_try_to_merge(struct inode *inode,
+static void ext4_ext_try_to_merge(handle_t *handle,
+                                  struct inode *inode,
                                   struct ext4_ext_path *path,
                                   struct ext4_extent *ex) {
         struct ext4_extent_header *eh;
         unsigned int depth;
         int merge_done = 0;
-        int ret = 0;
 
         depth = ext_depth(inode);
         BUG_ON(path[depth].p_hdr == NULL);
@@ -1675,9 +1719,9 @@ static int ext4_ext_try_to_merge(struct inode *inode,
                 merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1);
 
         if (!merge_done)
-                ret = ext4_ext_try_to_merge_right(inode, path, ex);
+                (void) ext4_ext_try_to_merge_right(inode, path, ex);
 
-        return ret;
+        ext4_ext_try_to_merge_up(handle, inode, path);
 }
 
 /*
@@ -1893,7 +1937,7 @@ has_space:
 merge:
         /* try to merge extents */
         if (!(flag & EXT4_GET_BLOCKS_PRE_IO))
-                ext4_ext_try_to_merge(inode, path, nearex);
+                ext4_ext_try_to_merge(handle, inode, path, nearex);
 
 
         /* time to correct all indexes above */
@@ -1901,7 +1945,7 @@ merge:
         if (err)
                 goto cleanup;
 
-        err = ext4_ext_dirty(handle, inode, path + depth);
+        err = ext4_ext_dirty(handle, inode, path + path->p_depth);
 
 cleanup:
         if (npath) {
@@ -2092,13 +2136,10 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
 }
 
 /*
- * ext4_ext_check_cache()
+ * ext4_ext_in_cache()
  * Checks to see if the given block is in the cache.
  * If it is, the cached extent is stored in the given
- * cache extent pointer.  If the cached extent is a hole,
- * this routine should be used instead of
- * ext4_ext_in_cache if the calling function needs to
- * know the size of the hole.
+ * cache extent pointer.
  *
  * @inode: The files inode
  * @block: The block to look for in the cache
@@ -2107,8 +2148,10 @@ ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
  *
  * Return 0 if cache is invalid; 1 if the cache is valid
  */
-static int ext4_ext_check_cache(struct inode *inode, ext4_lblk_t block,
-        struct ext4_ext_cache *ex){
+static int
+ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
+                  struct ext4_extent *ex)
+{
         struct ext4_ext_cache *cex;
         struct ext4_sb_info *sbi;
         int ret = 0;
@@ -2125,7 +2168,9 @@ static int ext4_ext_check_cache(struct inode *inode, ext4_lblk_t block,
                 goto errout;
 
         if (in_range(block, cex->ec_block, cex->ec_len)) {
-                memcpy(ex, cex, sizeof(struct ext4_ext_cache));
+                ex->ee_block = cpu_to_le32(cex->ec_block);
+                ext4_ext_store_pblock(ex, cex->ec_start);
+                ex->ee_len = cpu_to_le16(cex->ec_len);
                 ext_debug("%u cached by %u:%u:%llu\n",
                                 block,
                                 cex->ec_block, cex->ec_len, cex->ec_start);
@@ -2138,37 +2183,6 @@ errout:
 }
 
 /*
- * ext4_ext_in_cache()
- * Checks to see if the given block is in the cache.
- * If it is, the cached extent is stored in the given
- * extent pointer.
- *
- * @inode: The files inode
- * @block: The block to look for in the cache
- * @ex:    Pointer where the cached extent will be stored
- *         if it contains block
- *
- * Return 0 if cache is invalid; 1 if the cache is valid
- */
-static int
-ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
-                        struct ext4_extent *ex)
-{
-        struct ext4_ext_cache cex;
-        int ret = 0;
-
-        if (ext4_ext_check_cache(inode, block, &cex)) {
-                ex->ee_block = cpu_to_le32(cex.ec_block);
-                ext4_ext_store_pblock(ex, cex.ec_start);
-                ex->ee_len = cpu_to_le16(cex.ec_len);
-                ret = 1;
-        }
-
-        return ret;
-}
-
-
-/*
  * ext4_ext_rm_idx:
  * removes index from the index block.
  */
@@ -2274,10 +2288,13 @@ static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
         unsigned short ee_len =  ext4_ext_get_actual_len(ex);
         ext4_fsblk_t pblk;
-        int flags = EXT4_FREE_BLOCKS_FORGET;
+        int flags = 0;
 
         if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
-                flags |= EXT4_FREE_BLOCKS_METADATA;
+                flags |= EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET;
+        else if (ext4_should_journal_data(inode))
+                flags |= EXT4_FREE_BLOCKS_FORGET;
+
         /*
          * For bigalloc file systems, we never free a partial cluster
          * at the beginning of the extent.  Instead, we make a note
@@ -2572,7 +2589,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
         struct ext4_ext_path *path = NULL;
         ext4_fsblk_t partial_cluster = 0;
         handle_t *handle;
-        int i = 0, err;
+        int i = 0, err = 0;
 
         ext_debug("truncate since %u to %u\n", start, end);
 
@@ -2604,12 +2621,16 @@ again:
                         return PTR_ERR(path);
                 }
                 depth = ext_depth(inode);
+                /* Leaf not may not exist only if inode has no blocks at all */
                 ex = path[depth].p_ext;
                 if (!ex) {
-                        ext4_ext_drop_refs(path);
-                        kfree(path);
-                        path = NULL;
-                        goto cont;
+                        if (depth) {
+                                EXT4_ERROR_INODE(inode,
+                                                 "path[%d].p_hdr == NULL",
+                                                 depth);
+                                err = -EIO;
+                        }
+                        goto out;
                 }
 
                 ee_block = le32_to_cpu(ex->ee_block);
@@ -2641,8 +2662,6 @@ again:
                                 goto out;
                 }
         }
-cont:
-
         /*
          * We start scanning from right side, freeing all the blocks
          * after i_size and walking into the tree depth-wise.
@@ -2924,9 +2943,9 @@ static int ext4_split_extent_at(handle_t *handle,
                         ext4_ext_mark_initialized(ex);
 
                 if (!(flags & EXT4_GET_BLOCKS_PRE_IO))
-                        ext4_ext_try_to_merge(inode, path, ex);
+                        ext4_ext_try_to_merge(handle, inode, path, ex);
 
-                err = ext4_ext_dirty(handle, inode, path + depth);
+                err = ext4_ext_dirty(handle, inode, path + path->p_depth);
                 goto out;
         }
 
@@ -2958,8 +2977,8 @@ static int ext4_split_extent_at(handle_t *handle,
                         goto fix_extent_len;
                 /* update the extent length and mark as initialized */
                 ex->ee_len = cpu_to_le16(ee_len);
-                ext4_ext_try_to_merge(inode, path, ex);
-                err = ext4_ext_dirty(handle, inode, path + depth);
+                ext4_ext_try_to_merge(handle, inode, path, ex);
+                err = ext4_ext_dirty(handle, inode, path + path->p_depth);
                 goto out;
         } else if (err)
                 goto fix_extent_len;
@@ -3041,7 +3060,6 @@ out:
         return err ? err : map->m_len;
 }
 
-#define EXT4_EXT_ZERO_LEN 7
 /*
  * This function is called by ext4_ext_map_blocks() if someone tries to write
  * to an uninitialized extent. It may result in splitting the uninitialized
@@ -3067,13 +3085,14 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                                            struct ext4_map_blocks *map,
                                            struct ext4_ext_path *path)
 {
+        struct ext4_sb_info *sbi;
         struct ext4_extent_header *eh;
         struct ext4_map_blocks split_map;
         struct ext4_extent zero_ex;
         struct ext4_extent *ex;
         ext4_lblk_t ee_block, eof_block;
         unsigned int ee_len, depth;
-        int allocated;
+        int allocated, max_zeroout = 0;
         int err = 0;
         int split_flag = 0;
 
@@ -3081,6 +3100,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                 "block %llu, max_blocks %u\n", inode->i_ino,
                 (unsigned long long)map->m_lblk, map->m_len);
 
+        sbi = EXT4_SB(inode->i_sb);
         eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >>
                 inode->i_sb->s_blocksize_bits;
         if (eof_block < map->m_lblk + map->m_len)
@@ -3180,9 +3200,12 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
          */
         split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0;
 
-        /* If extent has less than 2*EXT4_EXT_ZERO_LEN zerout directly */
-        if (ee_len <= 2*EXT4_EXT_ZERO_LEN &&
-            (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
+        if (EXT4_EXT_MAY_ZEROOUT & split_flag)
+                max_zeroout = sbi->s_extent_max_zeroout_kb >>
+                        inode->i_sb->s_blocksize_bits;
+
+        /* If extent is less than s_max_zeroout_kb, zeroout directly */
+        if (max_zeroout && (ee_len <= max_zeroout)) {
                 err = ext4_ext_zeroout(inode, ex);
                 if (err)
                         goto out;
@@ -3191,8 +3214,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                 if (err)
                         goto out;
                 ext4_ext_mark_initialized(ex);
-                ext4_ext_try_to_merge(inode, path, ex);
-                err = ext4_ext_dirty(handle, inode, path + depth);
+                ext4_ext_try_to_merge(handle, inode, path, ex);
+                err = ext4_ext_dirty(handle, inode, path + path->p_depth);
                 goto out;
         }
 
@@ -3206,9 +3229,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
         split_map.m_lblk = map->m_lblk;
         split_map.m_len = map->m_len;
 
-        if (allocated > map->m_len) {
-                if (allocated <= EXT4_EXT_ZERO_LEN &&
-                    (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
+        if (max_zeroout && (allocated > map->m_len)) {
+                if (allocated <= max_zeroout) {
                         /* case 3 */
                         zero_ex.ee_block =
                                          cpu_to_le32(map->m_lblk);
@@ -3220,9 +3242,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
                                 goto out;
                         split_map.m_lblk = map->m_lblk;
                         split_map.m_len = allocated;
-                } else if ((map->m_lblk - ee_block + map->m_len <
-                           EXT4_EXT_ZERO_LEN) &&
-                           (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
+                } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) {
                         /* case 2 */
                         if (map->m_lblk != ee_block) {
                                 zero_ex.ee_block = ex->ee_block;
@@ -3242,7 +3262,7 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
         }
 
         allocated = ext4_split_extent(handle, inode, path,
-                                       &split_map, split_flag, 0);
+                                      &split_map, split_flag, 0);
         if (allocated < 0)
                 err = allocated;
 
@@ -3256,7 +3276,7 @@ out:
  * to an uninitialized extent.
  *
  * Writing to an uninitialized extent may result in splitting the uninitialized
- * extent into multiple /initialized uninitialized extents (up to three)
+ * extent into multiple initialized/uninitialized extents (up to three)
  * There are three possibilities:
  *   a> There is no split required: Entire extent should be uninitialized
  *   b> Splits in two extents: Write is happening at either end of the extent
@@ -3333,10 +3353,10 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
         /* note: ext4_ext_correct_indexes() isn't needed here because
          * borders are not changed
          */
-        ext4_ext_try_to_merge(inode, path, ex);
+        ext4_ext_try_to_merge(handle, inode, path, ex);
 
         /* Mark modified extent as dirty */
-        err = ext4_ext_dirty(handle, inode, path + depth);
+        err = ext4_ext_dirty(handle, inode, path + path->p_depth);
 out:
         ext4_ext_show_leaf(inode, path);
         return err;
@@ -3600,7 +3620,7 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
 {
         int ret = 0;
         int err = 0;
-        ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
+        ext4_io_end_t *io = ext4_inode_aio(inode);
 
         ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical "
                   "block %llu, max_blocks %u, flags %x, allocated %u\n",
@@ -3615,6 +3635,8 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
         if ((flags & EXT4_GET_BLOCKS_PRE_IO)) {
                 ret = ext4_split_unwritten_extents(handle, inode, map,
                                                    path, flags);
+                if (ret <= 0)
+                        goto out;
                 /*
                  * Flag the inode(non aio case) or end_io struct (aio case)
                  * that this IO needs to conversion to written when IO is
@@ -3858,8 +3880,9 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
         unsigned int allocated = 0, offset = 0;
         unsigned int allocated_clusters = 0;
         struct ext4_allocation_request ar;
-        ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
+        ext4_io_end_t *io = ext4_inode_aio(inode);
         ext4_lblk_t cluster_offset;
+        int set_unwritten = 0;
 
         ext_debug("blocks %u/%u requested for inode %lu\n",
                   map->m_lblk, map->m_len, inode->i_ino);
@@ -4082,13 +4105,8 @@ got_allocated_blocks:
                  * For non asycn direct IO case, flag the inode state
                  * that we need to perform conversion when IO is done.
                  */
-                if ((flags & EXT4_GET_BLOCKS_PRE_IO)) {
-                        if (io)
-                                ext4_set_io_unwritten_flag(inode, io);
-                        else
-                                ext4_set_inode_state(inode,
-                                                     EXT4_STATE_DIO_UNWRITTEN);
-                }
+                if ((flags & EXT4_GET_BLOCKS_PRE_IO))
+                        set_unwritten = 1;
                 if (ext4_should_dioread_nolock(inode))
                         map->m_flags |= EXT4_MAP_UNINIT;
         }
@@ -4100,6 +4118,15 @@ got_allocated_blocks:
         if (!err)
                 err = ext4_ext_insert_extent(handle, inode, path,
                                              &newex, flags);
+
+        if (!err && set_unwritten) {
+                if (io)
+                        ext4_set_io_unwritten_flag(inode, io);
+                else
+                        ext4_set_inode_state(inode,
+                                             EXT4_STATE_DIO_UNWRITTEN);
+        }
+
         if (err && free_on_err) {
                 int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ?
                         EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0;
@@ -4241,7 +4268,7 @@ void ext4_ext_truncate(struct inode *inode)
          * finish any pending end_io work so we won't run the risk of
          * converting any truncated blocks to initialized later
          */
-        ext4_flush_completed_IO(inode);
+        ext4_flush_unwritten_io(inode);
 
         /*
          * probably first extent we're gonna free will be last in block
@@ -4769,9 +4796,32 @@ int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length)
         loff_t first_page_offset, last_page_offset;
         int credits, err = 0;
 
+        /*
+         * Write out all dirty pages to avoid race conditions
+         * Then release them.
+         */
+        if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+                err = filemap_write_and_wait_range(mapping,
+                        offset, offset + length - 1);
+
+                if (err)
+                        return err;
+        }
+
+        mutex_lock(&inode->i_mutex);
+        /* It's not possible punch hole on append only file */
+        if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
+                err = -EPERM;
+                goto out_mutex;
+        }
+        if (IS_SWAPFILE(inode)) {
+                err = -ETXTBSY;
+                goto out_mutex;
+        }
+
         /* No need to punch hole beyond i_size */
         if (offset >= inode->i_size)
-                return 0;
+                goto out_mutex;
 
         /*
          * If the hole extends beyond i_size, set the hole
@@ -4789,35 +4839,26 @@ int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length)
         first_page_offset = first_page << PAGE_CACHE_SHIFT;
         last_page_offset = last_page << PAGE_CACHE_SHIFT;
 
-        /*
-         * Write out all dirty pages to avoid race conditions
-         * Then release them.
-         */
-        if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
-                err = filemap_write_and_wait_range(mapping,
-                        offset, offset + length - 1);
-
-                if (err)
-                        return err;
-        }
-
         /* Now release the pages */
         if (last_page_offset > first_page_offset) {
                 truncate_pagecache_range(inode, first_page_offset,
                                          last_page_offset - 1);
         }
 
-        /* finish any pending end_io work */
-        ext4_flush_completed_IO(inode);
+        /* Wait all existing dio workers, newcomers will block on i_mutex */
+        ext4_inode_block_unlocked_dio(inode);
+        err = ext4_flush_unwritten_io(inode);
+        if (err)
+                goto out_dio;
+        inode_dio_wait(inode);
 
         credits = ext4_writepage_trans_blocks(inode);
         handle = ext4_journal_start(inode, credits);
-        if (IS_ERR(handle))
-                return PTR_ERR(handle);
+        if (IS_ERR(handle)) {
+                err = PTR_ERR(handle);
+                goto out_dio;
+        }
 
-        err = ext4_orphan_add(handle, inode);
-        if (err)
-                goto out;
 
         /*
          * Now we need to zero out the non-page-aligned data in the
@@ -4903,10 +4944,13 @@ int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length)
         up_write(&EXT4_I(inode)->i_data_sem);
 
 out:
-        ext4_orphan_del(handle, inode);
         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
         ext4_mark_inode_dirty(handle, inode);
         ext4_journal_stop(handle);
+out_dio:
+        ext4_inode_resume_unlocked_dio(inode);
+out_mutex:
+        mutex_unlock(&inode->i_mutex);
         return err;
 }
 int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,