diff options
| -rw-r--r-- | fs/ext4/ext4.h | 4 | ||||
| -rw-r--r-- | fs/ext4/inline.c | 177 | ||||
| -rw-r--r-- | fs/ext4/inode.c | 63 | ||||
| -rw-r--r-- | fs/ext4/xattr.h | 27 |
4 files changed, 262 insertions, 9 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9f4efc6..268636a 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2022,6 +2022,8 @@ int ext4_get_block_write(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); int ext4_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); +int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int create); int ext4_walk_page_buffers(handle_t *handle, struct buffer_head *head, unsigned from, @@ -2031,6 +2033,8 @@ int ext4_walk_page_buffers(handle_t *handle, struct buffer_head *bh)); int do_journal_get_write_access(handle_t *handle, struct buffer_head *bh); +#define FALL_BACK_TO_NONDELALLOC 1 +#define CONVERT_INLINE_DATA 2 extern struct inode *ext4_iget(struct super_block *, unsigned long); extern int ext4_write_inode(struct inode *, struct writeback_control *); diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 01274b1..65f7ffb 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -771,6 +771,183 @@ ext4_journalled_write_inline_data(struct inode *inode, return iloc.bh; } +/* + * Try to make the page cache and handle ready for the inline data case. + * We can call this function in 2 cases: + * 1. The inode is created and the first write exceeds inline size. We can + * clear the inode state safely. + * 2. The inode has inline data, then we need to read the data, make it + * update and dirty so that ext4_da_writepages can handle it. We don't + * need to start the journal since the file's metatdata isn't changed now. + */ +static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, + struct inode *inode, + unsigned flags, + void **fsdata) +{ + int ret = 0, inline_size; + struct page *page; + + page = grab_cache_page_write_begin(mapping, 0, flags); + if (!page) + return -ENOMEM; + + down_read(&EXT4_I(inode)->xattr_sem); + if (!ext4_has_inline_data(inode)) { + ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); + goto out; + } + + inline_size = ext4_get_inline_size(inode); + + if (!PageUptodate(page)) { + ret = ext4_read_inline_page(inode, page); + if (ret < 0) + goto out; + } + + ret = __block_write_begin(page, 0, inline_size, + ext4_da_get_block_prep); + if (ret) { + ext4_truncate_failed_write(inode); + goto out; + } + + SetPageDirty(page); + SetPageUptodate(page); + ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); + *fsdata = (void *)CONVERT_INLINE_DATA; + +out: + up_read(&EXT4_I(inode)->xattr_sem); + if (page) { + unlock_page(page); + page_cache_release(page); + } + return ret; +} + +/* + * Prepare the write for the inline data. + * If the the data can be written into the inode, we just read + * the page and make it uptodate, and start the journal. + * Otherwise read the page, makes it dirty so that it can be + * handle in writepages(the i_disksize update is left to the + * normal ext4_da_write_end). + */ +int ext4_da_write_inline_data_begin(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep, + void **fsdata) +{ + int ret, inline_size; + handle_t *handle; + struct page *page; + struct ext4_iloc iloc; + + ret = ext4_get_inode_loc(inode, &iloc); + if (ret) + return ret; + + handle = ext4_journal_start(inode, 1); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + handle = NULL; + goto out; + } + + inline_size = ext4_get_max_inline_size(inode); + + ret = -ENOSPC; + if (inline_size >= pos + len) { + ret = ext4_prepare_inline_data(handle, inode, pos + len); + if (ret && ret != -ENOSPC) + goto out; + } + + if (ret == -ENOSPC) { + ret = ext4_da_convert_inline_data_to_extent(mapping, + inode, + flags, + fsdata); + goto out; + } + + /* + * We cannot recurse into the filesystem as the transaction + * is already started. + */ + flags |= AOP_FLAG_NOFS; + + page = grab_cache_page_write_begin(mapping, 0, flags); + if (!page) { + ret = -ENOMEM; + goto out; + } + + down_read(&EXT4_I(inode)->xattr_sem); + if (!ext4_has_inline_data(inode)) { + ret = 0; + goto out_release_page; + } + + if (!PageUptodate(page)) { + ret = ext4_read_inline_page(inode, page); + if (ret < 0) + goto out_release_page; + } + + up_read(&EXT4_I(inode)->xattr_sem); + *pagep = page; + handle = NULL; + brelse(iloc.bh); + return 1; +out_release_page: + up_read(&EXT4_I(inode)->xattr_sem); + unlock_page(page); + page_cache_release(page); +out: + if (handle) + ext4_journal_stop(handle); + brelse(iloc.bh); + return ret; +} + +int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, + unsigned len, unsigned copied, + struct page *page) +{ + int i_size_changed = 0; + + copied = ext4_write_inline_data_end(inode, pos, len, copied, page); + + /* + * No need to use i_size_read() here, the i_size + * cannot change under us because we hold i_mutex. + * + * But it's important to update i_size while still holding page lock: + * page writeout could otherwise come in and zero beyond i_size. + */ + if (pos+copied > inode->i_size) { + i_size_write(inode, pos+copied); + i_size_changed = 1; + } + unlock_page(page); + page_cache_release(page); + + /* + * Don't mark the inode dirty under page lock. First, it unnecessarily + * makes the holding time of page lock longer. Second, it forces lock + * ordering of page lock and transaction start for journaling + * filesystems. + */ + if (i_size_changed) + mark_inode_dirty(inode); + + return copied; +} int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) { diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5c91622..f16ae02 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1790,7 +1790,19 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, * file system block. */ down_read((&EXT4_I(inode)->i_data_sem)); - if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) + if (ext4_has_inline_data(inode)) { + /* + * We will soon create blocks for this page, and let + * us pretend as if the blocks aren't allocated yet. + * In case of clusters, we have to handle the work + * of mapping from cluster so that the reserved space + * is calculated properly. + */ + if ((EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) && + ext4_find_delalloc_cluster(inode, map->m_lblk)) + map->m_flags |= EXT4_MAP_FROM_CLUSTER; + retval = 0; + } else if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) retval = ext4_ext_map_blocks(NULL, inode, map, 0); else retval = ext4_ind_map_blocks(NULL, inode, map, 0); @@ -1841,8 +1853,8 @@ out_unlock: * We also have b_blocknr = physicalblock mapping unwritten extent and b_bdev * initialized properly. */ -static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, - struct buffer_head *bh, int create) +int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int create) { struct ext4_map_blocks map; int ret = 0; @@ -2119,7 +2131,8 @@ static int ext4_da_writepages_trans_blocks(struct inode *inode) * mpage_da_map_and_submit to map a single contiguous memory region * and then write them. */ -static int write_cache_pages_da(struct address_space *mapping, +static int write_cache_pages_da(handle_t *handle, + struct address_space *mapping, struct writeback_control *wbc, struct mpage_da_data *mpd, pgoff_t *done_index) @@ -2198,6 +2211,17 @@ static int write_cache_pages_da(struct address_space *mapping, wait_on_page_writeback(page); BUG_ON(PageWriteback(page)); + /* + * If we have inline data and arrive here, it means that + * we will soon create the block for the 1st page, so + * we'd better clear the inline data here. + */ + if (ext4_has_inline_data(inode)) { + BUG_ON(ext4_test_inode_state(inode, + EXT4_STATE_MAY_INLINE_DATA)); + ext4_destroy_inline_data(handle, inode); + } + if (mpd->next_page != page->index) mpd->first_page = page->index; mpd->next_page = page->index + 1; @@ -2404,7 +2428,8 @@ retry: * contiguous region of logical blocks that need * blocks to be allocated by ext4 and submit them. */ - ret = write_cache_pages_da(mapping, wbc, &mpd, &done_index); + ret = write_cache_pages_da(handle, mapping, + wbc, &mpd, &done_index); /* * If we have a contiguous extent of pages and we * haven't done the I/O yet, map the blocks and submit @@ -2468,7 +2493,6 @@ out_writepages: return ret; } -#define FALL_BACK_TO_NONDELALLOC 1 static int ext4_nonda_switch(struct super_block *sb) { s64 free_blocks, dirty_blocks; @@ -2525,6 +2549,19 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping, } *fsdata = (void *)0; trace_ext4_da_write_begin(inode, pos, len, flags); + + if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) { + ret = ext4_da_write_inline_data_begin(mapping, inode, + pos, len, flags, + pagep, fsdata); + if (ret < 0) + goto out; + if (ret == 1) { + ret = 0; + goto out; + } + } + retry: /* * With delayed allocation, we don't log the i_disksize update @@ -2626,10 +2663,10 @@ static int ext4_da_write_end(struct file *file, * changes. So let's piggyback the i_disksize mark_inode_dirty * into that. */ - new_i_size = pos + copied; if (copied && new_i_size > EXT4_I(inode)->i_disksize) { - if (ext4_da_should_update_i_disksize(page, end)) { + if (ext4_has_inline_data(inode) || + ext4_da_should_update_i_disksize(page, end)) { down_write(&EXT4_I(inode)->i_data_sem); if (new_i_size > EXT4_I(inode)->i_disksize) EXT4_I(inode)->i_disksize = new_i_size; @@ -2641,8 +2678,16 @@ static int ext4_da_write_end(struct file *file, ext4_mark_inode_dirty(handle, inode); } } - ret2 = generic_write_end(file, mapping, pos, len, copied, + + if (write_mode != CONVERT_INLINE_DATA && + ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA) && + ext4_has_inline_data(inode)) + ret2 = ext4_da_write_inline_data_end(inode, pos, len, copied, + page); + else + ret2 = generic_write_end(file, mapping, pos, len, copied, page, fsdata); + copied = ret2; if (ret2 < 0) ret = ret2; diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h index 7095ac1..37e66f8 100644 --- a/fs/ext4/xattr.h +++ b/fs/ext4/xattr.h @@ -154,6 +154,15 @@ extern struct buffer_head * ext4_journalled_write_inline_data(struct inode *inode, unsigned len, struct page *page); +extern int ext4_da_write_inline_data_begin(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep, + void **fsdata); +extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, + unsigned len, unsigned copied, + struct page *page); # else /* CONFIG_EXT4_FS_XATTR */ static inline int @@ -300,6 +309,24 @@ ext4_journalled_write_inline_data(struct inode *inode, { return NULL; } + +static inline int +ext4_da_write_inline_data_begin(struct address_space *mapping, + struct inode *inode, + loff_t pos, unsigned len, + unsigned flags, + struct page **pagep, + void **fsdata) +{ + return 0; +} + +static inline int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, + unsigned len, unsigned copied, + struct page *page) +{ + return 0; +} # endif /* CONFIG_EXT4_FS_XATTR */ #ifdef CONFIG_EXT4_FS_SECURITY |
