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Diffstat (limited to 'fs/ext4/inode.c')
-rw-r--r--fs/ext4/inode.c534
1 files changed, 335 insertions, 199 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e6218cbc8..250c2df04 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -216,7 +216,6 @@ void ext4_evict_inode(struct inode *inode)
}
truncate_inode_pages_final(&inode->i_data);
- WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
goto no_delete;
}
@@ -228,8 +227,6 @@ void ext4_evict_inode(struct inode *inode)
ext4_begin_ordered_truncate(inode, 0);
truncate_inode_pages_final(&inode->i_data);
- WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
-
/*
* Protect us against freezing - iput() caller didn't have to have any
* protection against it
@@ -458,13 +455,13 @@ static void ext4_map_blocks_es_recheck(handle_t *handle,
* Otherwise, call with ext4_ind_map_blocks() to handle indirect mapping
* based files
*
- * On success, it returns the number of blocks being mapped or allocated.
- * if create==0 and the blocks are pre-allocated and unwritten block,
- * the result buffer head is unmapped. If the create ==1, it will make sure
- * the buffer head is mapped.
+ * On success, it returns the number of blocks being mapped or allocated. if
+ * create==0 and the blocks are pre-allocated and unwritten, the resulting @map
+ * is marked as unwritten. If the create == 1, it will mark @map as mapped.
*
* It returns 0 if plain look up failed (blocks have not been allocated), in
- * that case, buffer head is unmapped
+ * that case, @map is returned as unmapped but we still do fill map->m_len to
+ * indicate the length of a hole starting at map->m_lblk.
*
* It returns the error in case of allocation failure.
*/
@@ -507,6 +504,11 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
retval = map->m_len;
map->m_len = retval;
} else if (ext4_es_is_delayed(&es) || ext4_es_is_hole(&es)) {
+ map->m_pblk = 0;
+ retval = es.es_len - (map->m_lblk - es.es_lblk);
+ if (retval > map->m_len)
+ retval = map->m_len;
+ map->m_len = retval;
retval = 0;
} else {
BUG_ON(1);
@@ -682,6 +684,21 @@ out_sem:
ret = check_block_validity(inode, map);
if (ret != 0)
return ret;
+
+ /*
+ * Inodes with freshly allocated blocks where contents will be
+ * visible after transaction commit must be on transaction's
+ * ordered data list.
+ */
+ if (map->m_flags & EXT4_MAP_NEW &&
+ !(map->m_flags & EXT4_MAP_UNWRITTEN) &&
+ !(flags & EXT4_GET_BLOCKS_ZERO) &&
+ !IS_NOQUOTA(inode) &&
+ ext4_should_order_data(inode)) {
+ ret = ext4_jbd2_file_inode(handle, inode);
+ if (ret)
+ return ret;
+ }
}
return retval;
}
@@ -714,16 +731,11 @@ static void ext4_update_bh_state(struct buffer_head *bh, unsigned long flags)
cmpxchg(&bh->b_state, old_state, new_state) != old_state));
}
-/* Maximum number of blocks we map for direct IO at once. */
-#define DIO_MAX_BLOCKS 4096
-
static int _ext4_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh, int flags)
{
- handle_t *handle = ext4_journal_current_handle();
struct ext4_map_blocks map;
- int ret = 0, started = 0;
- int dio_credits;
+ int ret = 0;
if (ext4_has_inline_data(inode))
return -ERANGE;
@@ -731,33 +743,14 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
- if (flags && !handle) {
- /* Direct IO write... */
- if (map.m_len > DIO_MAX_BLOCKS)
- map.m_len = DIO_MAX_BLOCKS;
- dio_credits = ext4_chunk_trans_blocks(inode, map.m_len);
- handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS,
- dio_credits);
- if (IS_ERR(handle)) {
- ret = PTR_ERR(handle);
- return ret;
- }
- started = 1;
- }
-
- ret = ext4_map_blocks(handle, inode, &map, flags);
+ ret = ext4_map_blocks(ext4_journal_current_handle(), inode, &map,
+ flags);
if (ret > 0) {
- ext4_io_end_t *io_end = ext4_inode_aio(inode);
-
map_bh(bh, inode->i_sb, map.m_pblk);
ext4_update_bh_state(bh, map.m_flags);
- if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
- set_buffer_defer_completion(bh);
bh->b_size = inode->i_sb->s_blocksize * map.m_len;
ret = 0;
}
- if (started)
- ext4_journal_stop(handle);
return ret;
}
@@ -769,6 +762,153 @@ int ext4_get_block(struct inode *inode, sector_t iblock,
}
/*
+ * Get block function used when preparing for buffered write if we require
+ * creating an unwritten extent if blocks haven't been allocated. The extent
+ * will be converted to written after the IO is complete.
+ */
+int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ ext4_debug("ext4_get_block_unwritten: inode %lu, create flag %d\n",
+ inode->i_ino, create);
+ return _ext4_get_block(inode, iblock, bh_result,
+ EXT4_GET_BLOCKS_IO_CREATE_EXT);
+}
+
+/* Maximum number of blocks we map for direct IO at once. */
+#define DIO_MAX_BLOCKS 4096
+
+/*
+ * Get blocks function for the cases that need to start a transaction -
+ * generally difference cases of direct IO and DAX IO. It also handles retries
+ * in case of ENOSPC.
+ */
+static int ext4_get_block_trans(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int flags)
+{
+ int dio_credits;
+ handle_t *handle;
+ int retries = 0;
+ int ret;
+
+ /* Trim mapping request to maximum we can map at once for DIO */
+ if (bh_result->b_size >> inode->i_blkbits > DIO_MAX_BLOCKS)
+ bh_result->b_size = DIO_MAX_BLOCKS << inode->i_blkbits;
+ dio_credits = ext4_chunk_trans_blocks(inode,
+ bh_result->b_size >> inode->i_blkbits);
+retry:
+ handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, dio_credits);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+
+ ret = _ext4_get_block(inode, iblock, bh_result, flags);
+ ext4_journal_stop(handle);
+
+ if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+ goto retry;
+ return ret;
+}
+
+/* Get block function for DIO reads and writes to inodes without extents */
+int ext4_dio_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh, int create)
+{
+ /* We don't expect handle for direct IO */
+ WARN_ON_ONCE(ext4_journal_current_handle());
+
+ if (!create)
+ return _ext4_get_block(inode, iblock, bh, 0);
+ return ext4_get_block_trans(inode, iblock, bh, EXT4_GET_BLOCKS_CREATE);
+}
+
+/*
+ * Get block function for AIO DIO writes when we create unwritten extent if
+ * blocks are not allocated yet. The extent will be converted to written
+ * after IO is complete.
+ */
+static int ext4_dio_get_block_unwritten_async(struct inode *inode,
+ sector_t iblock, struct buffer_head *bh_result, int create)
+{
+ int ret;
+
+ /* We don't expect handle for direct IO */
+ WARN_ON_ONCE(ext4_journal_current_handle());
+
+ ret = ext4_get_block_trans(inode, iblock, bh_result,
+ EXT4_GET_BLOCKS_IO_CREATE_EXT);
+
+ /*
+ * When doing DIO using unwritten extents, we need io_end to convert
+ * unwritten extents to written on IO completion. We allocate io_end
+ * once we spot unwritten extent and store it in b_private. Generic
+ * DIO code keeps b_private set and furthermore passes the value to
+ * our completion callback in 'private' argument.
+ */
+ if (!ret && buffer_unwritten(bh_result)) {
+ if (!bh_result->b_private) {
+ ext4_io_end_t *io_end;
+
+ io_end = ext4_init_io_end(inode, GFP_KERNEL);
+ if (!io_end)
+ return -ENOMEM;
+ bh_result->b_private = io_end;
+ ext4_set_io_unwritten_flag(inode, io_end);
+ }
+ set_buffer_defer_completion(bh_result);
+ }
+
+ return ret;
+}
+
+/*
+ * Get block function for non-AIO DIO writes when we create unwritten extent if
+ * blocks are not allocated yet. The extent will be converted to written
+ * after IO is complete from ext4_ext_direct_IO() function.
+ */
+static int ext4_dio_get_block_unwritten_sync(struct inode *inode,
+ sector_t iblock, struct buffer_head *bh_result, int create)
+{
+ int ret;
+
+ /* We don't expect handle for direct IO */
+ WARN_ON_ONCE(ext4_journal_current_handle());
+
+ ret = ext4_get_block_trans(inode, iblock, bh_result,
+ EXT4_GET_BLOCKS_IO_CREATE_EXT);
+
+ /*
+ * Mark inode as having pending DIO writes to unwritten extents.
+ * ext4_ext_direct_IO() checks this flag and converts extents to
+ * written.
+ */
+ if (!ret && buffer_unwritten(bh_result))
+ ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
+
+ return ret;
+}
+
+static int ext4_dio_get_block_overwrite(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ int ret;
+
+ ext4_debug("ext4_dio_get_block_overwrite: inode %lu, create flag %d\n",
+ inode->i_ino, create);
+ /* We don't expect handle for direct IO */
+ WARN_ON_ONCE(ext4_journal_current_handle());
+
+ ret = _ext4_get_block(inode, iblock, bh_result, 0);
+ /*
+ * Blocks should have been preallocated! ext4_file_write_iter() checks
+ * that.
+ */
+ WARN_ON_ONCE(!buffer_mapped(bh_result) || buffer_unwritten(bh_result));
+
+ return ret;
+}
+
+
+/*
* `handle' can be NULL if create is zero
*/
struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
@@ -930,7 +1070,7 @@ int do_journal_get_write_access(handle_t *handle,
static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block)
{
- unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned from = pos & (PAGE_SIZE - 1);
unsigned to = from + len;
struct inode *inode = page->mapping->host;
unsigned block_start, block_end;
@@ -942,15 +1082,15 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
bool decrypt = false;
BUG_ON(!PageLocked(page));
- BUG_ON(from > PAGE_CACHE_SIZE);
- BUG_ON(to > PAGE_CACHE_SIZE);
+ BUG_ON(from > PAGE_SIZE);
+ BUG_ON(to > PAGE_SIZE);
BUG_ON(from > to);
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
head = page_buffers(page);
bbits = ilog2(blocksize);
- block = (sector_t)page->index << (PAGE_CACHE_SHIFT - bbits);
+ block = (sector_t)page->index << (PAGE_SHIFT - bbits);
for (bh = head, block_start = 0; bh != head || !block_start;
block++, block_start = block_end, bh = bh->b_this_page) {
@@ -1032,8 +1172,8 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
* we allocate blocks but write fails for some reason
*/
needed_blocks = ext4_writepage_trans_blocks(inode) + 1;
- index = pos >> PAGE_CACHE_SHIFT;
- from = pos & (PAGE_CACHE_SIZE - 1);
+ index = pos >> PAGE_SHIFT;
+ from = pos & (PAGE_SIZE - 1);
to = from + len;
if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
@@ -1061,7 +1201,7 @@ retry_grab:
retry_journal:
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
if (IS_ERR(handle)) {
- page_cache_release(page);
+ put_page(page);
return PTR_ERR(handle);
}
@@ -1069,7 +1209,7 @@ retry_journal:
if (page->mapping != mapping) {
/* The page got truncated from under us */
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
ext4_journal_stop(handle);
goto retry_grab;
}
@@ -1079,13 +1219,14 @@ retry_journal:
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (ext4_should_dioread_nolock(inode))
ret = ext4_block_write_begin(page, pos, len,
- ext4_get_block_write);
+ ext4_get_block_unwritten);
else
ret = ext4_block_write_begin(page, pos, len,
ext4_get_block);
#else
if (ext4_should_dioread_nolock(inode))
- ret = __block_write_begin(page, pos, len, ext4_get_block_write);
+ ret = __block_write_begin(page, pos, len,
+ ext4_get_block_unwritten);
else
ret = __block_write_begin(page, pos, len, ext4_get_block);
#endif
@@ -1124,7 +1265,7 @@ retry_journal:
if (ret == -ENOSPC &&
ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry_journal;
- page_cache_release(page);
+ put_page(page);
return ret;
}
*pagep = page;
@@ -1163,15 +1304,6 @@ static int ext4_write_end(struct file *file,
int i_size_changed = 0;
trace_ext4_write_end(inode, pos, len, copied);
- if (ext4_test_inode_state(inode, EXT4_STATE_ORDERED_MODE)) {
- ret = ext4_jbd2_file_inode(handle, inode);
- if (ret) {
- unlock_page(page);
- page_cache_release(page);
- goto errout;
- }
- }
-
if (ext4_has_inline_data(inode)) {
ret = ext4_write_inline_data_end(inode, pos, len,
copied, page);
@@ -1187,7 +1319,7 @@ static int ext4_write_end(struct file *file,
*/
i_size_changed = ext4_update_inode_size(inode, pos + copied);
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
@@ -1271,7 +1403,7 @@ static int ext4_journalled_write_end(struct file *file,
int size_changed = 0;
trace_ext4_journalled_write_end(inode, pos, len, copied);
- from = pos & (PAGE_CACHE_SIZE - 1);
+ from = pos & (PAGE_SIZE - 1);
to = from + len;
BUG_ON(!ext4_handle_valid(handle));
@@ -1295,7 +1427,7 @@ static int ext4_journalled_write_end(struct file *file,
ext4_set_inode_state(inode, EXT4_STATE_JDATA);
EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid;
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
@@ -1409,7 +1541,7 @@ static void ext4_da_page_release_reservation(struct page *page,
int num_clusters;
ext4_fsblk_t lblk;
- BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
+ BUG_ON(stop > PAGE_SIZE || stop < length);
head = page_buffers(page);
bh = head;
@@ -1425,7 +1557,7 @@ static void ext4_da_page_release_reservation(struct page *page,
clear_buffer_delay(bh);
} else if (contiguous_blks) {
lblk = page->index <<
- (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ (PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) -
contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
@@ -1435,7 +1567,7 @@ static void ext4_da_page_release_reservation(struct page *page,
} while ((bh = bh->b_this_page) != head);
if (contiguous_blks) {
- lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ lblk = page->index << (PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) - contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
}
@@ -1444,7 +1576,7 @@ static void ext4_da_page_release_reservation(struct page *page,
* need to release the reserved space for that cluster. */
num_clusters = EXT4_NUM_B2C(sbi, to_release);
while (num_clusters > 0) {
- lblk = (page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits)) +
+ lblk = (page->index << (PAGE_SHIFT - inode->i_blkbits)) +
((num_clusters - 1) << sbi->s_cluster_bits);
if (sbi->s_cluster_ratio == 1 ||
!ext4_find_delalloc_cluster(inode, lblk))
@@ -1491,8 +1623,8 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
end = mpd->next_page - 1;
if (invalidate) {
ext4_lblk_t start, last;
- start = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
- last = end << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+ start = index << (PAGE_SHIFT - inode->i_blkbits);
+ last = end << (PAGE_SHIFT - inode->i_blkbits);
ext4_es_remove_extent(inode, start, last - start + 1);
}
@@ -1508,7 +1640,7 @@ static void mpage_release_unused_pages(struct mpage_da_data *mpd,
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
if (invalidate) {
- block_invalidatepage(page, 0, PAGE_CACHE_SIZE);
+ block_invalidatepage(page, 0, PAGE_SIZE);
ClearPageUptodate(page);
}
unlock_page(page);
@@ -1879,10 +2011,10 @@ static int ext4_writepage(struct page *page,
trace_ext4_writepage(page);
size = i_size_read(inode);
- if (page->index == size >> PAGE_CACHE_SHIFT)
- len = size & ~PAGE_CACHE_MASK;
+ if (page->index == size >> PAGE_SHIFT)
+ len = size & ~PAGE_MASK;
else
- len = PAGE_CACHE_SIZE;
+ len = PAGE_SIZE;
page_bufs = page_buffers(page);
/*
@@ -1906,7 +2038,7 @@ static int ext4_writepage(struct page *page,
ext4_bh_delay_or_unwritten)) {
redirty_page_for_writepage(wbc, page);
if ((current->flags & PF_MEMALLOC) ||
- (inode->i_sb->s_blocksize == PAGE_CACHE_SIZE)) {
+ (inode->i_sb->s_blocksize == PAGE_SIZE)) {
/*
* For memory cleaning there's no point in writing only
* some buffers. So just bail out. Warn if we came here
@@ -1948,10 +2080,10 @@ static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
int err;
BUG_ON(page->index != mpd->first_page);
- if (page->index == size >> PAGE_CACHE_SHIFT)
- len = size & ~PAGE_CACHE_MASK;
+ if (page->index == size >> PAGE_SHIFT)
+ len = size & ~PAGE_MASK;
else
- len = PAGE_CACHE_SIZE;
+ len = PAGE_SIZE;
clear_page_dirty_for_io(page);
err = ext4_bio_write_page(&mpd->io_submit, page, len, mpd->wbc, false);
if (!err)
@@ -2085,7 +2217,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
int nr_pages, i;
struct inode *inode = mpd->inode;
struct buffer_head *head, *bh;
- int bpp_bits = PAGE_CACHE_SHIFT - inode->i_blkbits;
+ int bpp_bits = PAGE_SHIFT - inode->i_blkbits;
pgoff_t start, end;
ext4_lblk_t lblk;
sector_t pblock;
@@ -2146,7 +2278,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
* supports blocksize < pagesize as we will try to
* convert potentially unmapped parts of inode.
*/
- mpd->io_submit.io_end->size += PAGE_CACHE_SIZE;
+ mpd->io_submit.io_end->size += PAGE_SIZE;
/* Page fully mapped - let IO run! */
err = mpage_submit_page(mpd, page);
if (err < 0) {
@@ -2298,7 +2430,7 @@ update_disksize:
* Update on-disk size after IO is submitted. Races with
* truncate are avoided by checking i_size under i_data_sem.
*/
- disksize = ((loff_t)mpd->first_page) << PAGE_CACHE_SHIFT;
+ disksize = ((loff_t)mpd->first_page) << PAGE_SHIFT;
if (disksize > EXT4_I(inode)->i_disksize) {
int err2;
loff_t i_size;
@@ -2434,7 +2566,7 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
mpd->next_page = page->index + 1;
/* Add all dirty buffers to mpd */
lblk = ((ext4_lblk_t)page->index) <<
- (PAGE_CACHE_SHIFT - blkbits);
+ (PAGE_SHIFT - blkbits);
head = page_buffers(page);
err = mpage_process_page_bufs(mpd, head, head, lblk);
if (err <= 0)
@@ -2519,7 +2651,7 @@ static int ext4_writepages(struct address_space *mapping,
* We may need to convert up to one extent per block in
* the page and we may dirty the inode.
*/
- rsv_blocks = 1 + (PAGE_CACHE_SIZE >> inode->i_blkbits);
+ rsv_blocks = 1 + (PAGE_SIZE >> inode->i_blkbits);
}
/*
@@ -2550,8 +2682,8 @@ static int ext4_writepages(struct address_space *mapping,
mpd.first_page = writeback_index;
mpd.last_page = -1;
} else {
- mpd.first_page = wbc->range_start >> PAGE_CACHE_SHIFT;
- mpd.last_page = wbc->range_end >> PAGE_CACHE_SHIFT;
+ mpd.first_page = wbc->range_start >> PAGE_SHIFT;
+ mpd.last_page = wbc->range_end >> PAGE_SHIFT;
}
mpd.inode = inode;
@@ -2710,7 +2842,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
handle_t *handle;
- index = pos >> PAGE_CACHE_SHIFT;
+ index = pos >> PAGE_SHIFT;
if (ext4_nonda_switch(inode->i_sb)) {
*fsdata = (void *)FALL_BACK_TO_NONDELALLOC;
@@ -2753,7 +2885,7 @@ retry_journal:
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
ext4_da_write_credits(inode, pos, len));
if (IS_ERR(handle)) {
- page_cache_release(page);
+ put_page(page);
return PTR_ERR(handle);
}
@@ -2761,7 +2893,7 @@ retry_journal:
if (page->mapping != mapping) {
/* The page got truncated from under us */
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
ext4_journal_stop(handle);
goto retry_grab;
}
@@ -2789,7 +2921,7 @@ retry_journal:
ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry_journal;
- page_cache_release(page);
+ put_page(page);
return ret;
}
@@ -2837,7 +2969,7 @@ static int ext4_da_write_end(struct file *file,
len, copied, page, fsdata);
trace_ext4_da_write_end(inode, pos, len, copied);
- start = pos & (PAGE_CACHE_SIZE - 1);
+ start = pos & (PAGE_SIZE - 1);
end = start + copied - 1;
/*
@@ -3059,7 +3191,7 @@ static int __ext4_journalled_invalidatepage(struct page *page,
/*
* If it's a full truncate we just forget about the pending dirtying
*/
- if (offset == 0 && length == PAGE_CACHE_SIZE)
+ if (offset == 0 && length == PAGE_SIZE)
ClearPageChecked(page);
return jbd2_journal_invalidatepage(journal, page, offset, length);
@@ -3088,37 +3220,6 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
return try_to_free_buffers(page);
}
-/*
- * ext4_get_block used when preparing for a DIO write or buffer write.
- * We allocate an uinitialized extent if blocks haven't been allocated.
- * The extent will be converted to initialized after the IO is complete.
- */
-int ext4_get_block_write(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
-{
- ext4_debug("ext4_get_block_write: inode %lu, create flag %d\n",
- inode->i_ino, create);
- return _ext4_get_block(inode, iblock, bh_result,
- EXT4_GET_BLOCKS_IO_CREATE_EXT);
-}
-
-static int ext4_get_block_overwrite(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
-{
- int ret;
-
- ext4_debug("ext4_get_block_overwrite: inode %lu, create flag %d\n",
- inode->i_ino, create);
- ret = _ext4_get_block(inode, iblock, bh_result, 0);
- /*
- * Blocks should have been preallocated! ext4_file_write_iter() checks
- * that.
- */
- WARN_ON_ONCE(!buffer_mapped(bh_result));
-
- return ret;
-}
-
#ifdef CONFIG_FS_DAX
int ext4_dax_mmap_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
@@ -3179,13 +3280,12 @@ out:
WARN_ON_ONCE(ret == 0 && create);
if (ret > 0) {
map_bh(bh_result, inode->i_sb, map.m_pblk);
- bh_result->b_state = (bh_result->b_state & ~EXT4_MAP_FLAGS) |
- map.m_flags;
/*
* At least for now we have to clear BH_New so that DAX code
* doesn't attempt to zero blocks again in a racy way.
*/
- bh_result->b_state &= ~(1 << BH_New);
+ map.m_flags &= ~EXT4_MAP_NEW;
+ ext4_update_bh_state(bh_result, map.m_flags);
bh_result->b_size = map.m_len << inode->i_blkbits;
ret = 0;
}
@@ -3193,24 +3293,32 @@ out:
}
#endif
-static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
+static int ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
ssize_t size, void *private)
{
- ext4_io_end_t *io_end = iocb->private;
+ ext4_io_end_t *io_end = private;
/* if not async direct IO just return */
if (!io_end)
- return;
+ return 0;
ext_debug("ext4_end_io_dio(): io_end 0x%p "
"for inode %lu, iocb 0x%p, offset %llu, size %zd\n",
- iocb->private, io_end->inode->i_ino, iocb, offset,
- size);
+ io_end, io_end->inode->i_ino, iocb, offset, size);
- iocb->private = NULL;
+ /*
+ * Error during AIO DIO. We cannot convert unwritten extents as the
+ * data was not written. Just clear the unwritten flag and drop io_end.
+ */
+ if (size <= 0) {
+ ext4_clear_io_unwritten_flag(io_end);
+ size = 0;
+ }
io_end->offset = offset;
io_end->size = size;
ext4_put_io_end(io_end);
+
+ return 0;
}
/*
@@ -3243,7 +3351,6 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
get_block_t *get_block_func = NULL;
int dio_flags = 0;
loff_t final_size = offset + count;
- ext4_io_end_t *io_end = NULL;
/* Use the old path for reads and writes beyond i_size. */
if (iov_iter_rw(iter) != WRITE || final_size > inode->i_size)
@@ -3268,16 +3375,17 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
/*
* We could direct write to holes and fallocate.
*
- * Allocated blocks to fill the hole are marked as
- * unwritten to prevent parallel buffered read to expose
- * the stale data before DIO complete the data IO.
+ * Allocated blocks to fill the hole are marked as unwritten to prevent
+ * parallel buffered read to expose the stale data before DIO complete
+ * the data IO.
*
- * As to previously fallocated extents, ext4 get_block will
- * just simply mark the buffer mapped but still keep the
- * extents unwritten.
+ * As to previously fallocated extents, ext4 get_block will just simply
+ * mark the buffer mapped but still keep the extents unwritten.
*
- * For non AIO case, we will convert those unwritten extents
- * to written after return back from blockdev_direct_IO.
+ * For non AIO case, we will convert those unwritten extents to written
+ * after return back from blockdev_direct_IO. That way we save us from
+ * allocating io_end structure and also the overhead of offloading
+ * the extent convertion to a workqueue.
*
* For async DIO, the conversion needs to be deferred when the
* IO is completed. The ext4 end_io callback function will be
@@ -3285,30 +3393,13 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
* case, we allocate an io_end structure to hook to the iocb.
*/
iocb->private = NULL;
- if (overwrite) {
- get_block_func = ext4_get_block_overwrite;
+ if (overwrite)
+ get_block_func = ext4_dio_get_block_overwrite;
+ else if (is_sync_kiocb(iocb)) {
+ get_block_func = ext4_dio_get_block_unwritten_sync;
+ dio_flags = DIO_LOCKING;
} else {
- ext4_inode_aio_set(inode, NULL);
- if (!is_sync_kiocb(iocb)) {
- io_end = ext4_init_io_end(inode, GFP_NOFS);
- if (!io_end) {
- ret = -ENOMEM;
- goto retake_lock;
- }
- /*
- * Grab reference for DIO. Will be dropped in
- * ext4_end_io_dio()
- */
- iocb->private = ext4_get_io_end(io_end);
- /*
- * we save the io structure for current async direct
- * IO, so that later ext4_map_blocks() could flag the
- * io structure whether there is a unwritten extents
- * needs to be converted when IO is completed.
- */
- ext4_inode_aio_set(inode, io_end);
- }
- get_block_func = ext4_get_block_write;
+ get_block_func = ext4_dio_get_block_unwritten_async;
dio_flags = DIO_LOCKING;
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
@@ -3323,27 +3414,6 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
get_block_func,
ext4_end_io_dio, NULL, dio_flags);
- /*
- * Put our reference to io_end. This can free the io_end structure e.g.
- * in sync IO case or in case of error. It can even perform extent
- * conversion if all bios we submitted finished before we got here.
- * Note that in that case iocb->private can be already set to NULL
- * here.
- */
- if (io_end) {
- ext4_inode_aio_set(inode, NULL);
- ext4_put_io_end(io_end);
- /*
- * When no IO was submitted ext4_end_io_dio() was not
- * called so we have to put iocb's reference.
- */
- if (ret <= 0 && ret != -EIOCBQUEUED && iocb->private) {
- WARN_ON(iocb->private != io_end);
- WARN_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
- ext4_put_io_end(io_end);
- iocb->private = NULL;
- }
- }
if (ret > 0 && !overwrite && ext4_test_inode_state(inode,
EXT4_STATE_DIO_UNWRITTEN)) {
int err;
@@ -3358,7 +3428,6 @@ static ssize_t ext4_ext_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
}
-retake_lock:
if (iov_iter_rw(iter) == WRITE)
inode_dio_end(inode);
/* take i_mutex locking again if we do a ovewrite dio */
@@ -3491,8 +3560,8 @@ void ext4_set_aops(struct inode *inode)
static int __ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
- ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ ext4_fsblk_t index = from >> PAGE_SHIFT;
+ unsigned offset = from & (PAGE_SIZE-1);
unsigned blocksize, pos;
ext4_lblk_t iblock;
struct inode *inode = mapping->host;
@@ -3500,14 +3569,14 @@ static int __ext4_block_zero_page_range(handle_t *handle,
struct page *page;
int err = 0;
- page = find_or_create_page(mapping, from >> PAGE_CACHE_SHIFT,
+ page = find_or_create_page(mapping, from >> PAGE_SHIFT,
mapping_gfp_constraint(mapping, ~__GFP_FS));
if (!page)
return -ENOMEM;
blocksize = inode->i_sb->s_blocksize;
- iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
+ iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
if (!page_has_buffers(page))
create_empty_buffers(page, blocksize, 0);
@@ -3549,7 +3618,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
ext4_encrypted_inode(inode)) {
/* We expect the key to be set. */
BUG_ON(!ext4_has_encryption_key(inode));
- BUG_ON(blocksize != PAGE_CACHE_SIZE);
+ BUG_ON(blocksize != PAGE_SIZE);
WARN_ON_ONCE(ext4_decrypt(page));
}
}
@@ -3573,7 +3642,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
unlock:
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
return err;
}
@@ -3588,7 +3657,7 @@ static int ext4_block_zero_page_range(handle_t *handle,
struct address_space *mapping, loff_t from, loff_t length)
{
struct inode *inode = mapping->host;
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ unsigned offset = from & (PAGE_SIZE-1);
unsigned blocksize = inode->i_sb->s_blocksize;
unsigned max = blocksize - (offset & (blocksize - 1));
@@ -3613,7 +3682,7 @@ static int ext4_block_zero_page_range(handle_t *handle,
static int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from)
{
- unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ unsigned offset = from & (PAGE_SIZE-1);
unsigned length;
unsigned blocksize;
struct inode *inode = mapping->host;
@@ -3751,7 +3820,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
*/
if (offset + length > inode->i_size) {
length = inode->i_size +
- PAGE_CACHE_SIZE - (inode->i_size & (PAGE_CACHE_SIZE - 1)) -
+ PAGE_SIZE - (inode->i_size & (PAGE_SIZE - 1)) -
offset;
}
@@ -4826,23 +4895,23 @@ static void ext4_wait_for_tail_page_commit(struct inode *inode)
tid_t commit_tid = 0;
int ret;
- offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
+ offset = inode->i_size & (PAGE_SIZE - 1);
/*
* All buffers in the last page remain valid? Then there's nothing to
- * do. We do the check mainly to optimize the common PAGE_CACHE_SIZE ==
+ * do. We do the check mainly to optimize the common PAGE_SIZE ==
* blocksize case
*/
- if (offset > PAGE_CACHE_SIZE - (1 << inode->i_blkbits))
+ if (offset > PAGE_SIZE - (1 << inode->i_blkbits))
return;
while (1) {
page = find_lock_page(inode->i_mapping,
- inode->i_size >> PAGE_CACHE_SHIFT);
+ inode->i_size >> PAGE_SHIFT);
if (!page)
return;
ret = __ext4_journalled_invalidatepage(page, offset,
- PAGE_CACHE_SIZE - offset);
+ PAGE_SIZE - offset);
unlock_page(page);
- page_cache_release(page);
+ put_page(page);
if (ret != -EBUSY)
return;
commit_tid = 0;
@@ -5481,10 +5550,10 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
goto out;
}
- if (page->index == size >> PAGE_CACHE_SHIFT)
- len = size & ~PAGE_CACHE_MASK;
+ if (page->index == size >> PAGE_SHIFT)
+ len = size & ~PAGE_MASK;
else
- len = PAGE_CACHE_SIZE;
+ len = PAGE_SIZE;
/*
* Return if we have all the buffers mapped. This avoids the need to do
* journal_start/journal_stop which can block and take a long time
@@ -5502,7 +5571,7 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
unlock_page(page);
/* OK, we need to fill the hole... */
if (ext4_should_dioread_nolock(inode))
- get_block = ext4_get_block_write;
+ get_block = ext4_get_block_unwritten;
else
get_block = ext4_get_block;
retry_alloc:
@@ -5515,7 +5584,7 @@ retry_alloc:
ret = block_page_mkwrite(vma, vmf, get_block);
if (!ret && ext4_should_journal_data(inode)) {
if (ext4_walk_page_buffers(handle, page_buffers(page), 0,
- PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) {
+ PAGE_SIZE, NULL, do_journal_get_write_access)) {
unlock_page(page);
ret = VM_FAULT_SIGBUS;
ext4_journal_stop(handle);
@@ -5545,3 +5614,70 @@ int ext4_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
return err;
}
+
+/*
+ * Find the first extent at or after @lblk in an inode that is not a hole.
+ * Search for @map_len blocks at most. The extent is returned in @result.
+ *
+ * The function returns 1 if we found an extent. The function returns 0 in
+ * case there is no extent at or after @lblk and in that case also sets
+ * @result->es_len to 0. In case of error, the error code is returned.
+ */
+int ext4_get_next_extent(struct inode *inode, ext4_lblk_t lblk,
+ unsigned int map_len, struct extent_status *result)
+{
+ struct ext4_map_blocks map;
+ struct extent_status es = {};
+ int ret;
+
+ map.m_lblk = lblk;
+ map.m_len = map_len;
+
+ /*
+ * For non-extent based files this loop may iterate several times since
+ * we do not determine full hole size.
+ */
+ while (map.m_len > 0) {
+ ret = ext4_map_blocks(NULL, inode, &map, 0);
+ if (ret < 0)
+ return ret;
+ /* There's extent covering m_lblk? Just return it. */
+ if (ret > 0) {
+ int status;
+
+ ext4_es_store_pblock(result, map.m_pblk);
+ result->es_lblk = map.m_lblk;
+ result->es_len = map.m_len;
+ if (map.m_flags & EXT4_MAP_UNWRITTEN)
+ status = EXTENT_STATUS_UNWRITTEN;
+ else
+ status = EXTENT_STATUS_WRITTEN;
+ ext4_es_store_status(result, status);
+ return 1;
+ }
+ ext4_es_find_delayed_extent_range(inode, map.m_lblk,
+ map.m_lblk + map.m_len - 1,
+ &es);
+ /* Is delalloc data before next block in extent tree? */
+ if (es.es_len && es.es_lblk < map.m_lblk + map.m_len) {
+ ext4_lblk_t offset = 0;
+
+ if (es.es_lblk < lblk)
+ offset = lblk - es.es_lblk;
+ result->es_lblk = es.es_lblk + offset;
+ ext4_es_store_pblock(result,
+ ext4_es_pblock(&es) + offset);
+ result->es_len = es.es_len - offset;
+ ext4_es_store_status(result, ext4_es_status(&es));
+
+ return 1;
+ }
+ /* There's a hole at m_lblk, advance us after it */
+ map.m_lblk += map.m_len;
+ map_len -= map.m_len;
+ map.m_len = map_len;
+ cond_resched();
+ }
+ result->es_len = 0;
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-01 02:31:53 +0000