return retval;
}
-static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
-{
- struct inode *inode = bh->b_assoc_map->host;
- /* XXX: breaks on 32-bit > 16GB. Is that even supported? */
- loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits;
- int err;
- if (!uptodate)
- return;
- WARN_ON(!buffer_unwritten(bh));
- err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size);
-}
-
/* Maximum number of blocks we map for direct IO at once. */
#define DIO_MAX_BLOCKS 4096
map_bh(bh, inode->i_sb, map.m_pblk);
bh->b_state = (bh->b_state & ~EXT4_MAP_FLAGS) | map.m_flags;
- if (IS_DAX(inode) && buffer_unwritten(bh) && !io_end) {
+ if (IS_DAX(inode) && buffer_unwritten(bh)) {
+ /*
+ * dgc: I suspect unwritten conversion on ext4+DAX is
+ * fundamentally broken here when there are concurrent
+ * read/write in progress on this inode.
+ */
+ WARN_ON_ONCE(io_end);
bh->b_assoc_map = inode->i_mapping;
bh->b_private = (void *)(unsigned long)iblock;
- bh->b_end_io = ext4_end_io_unwritten;
}
if (io_end && io_end->flag & EXT4_IO_END_UNWRITTEN)
set_buffer_defer_completion(bh);
* `handle' can be NULL if create is zero
*/
struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct ext4_map_blocks map;
struct buffer_head *bh;
+ int create = map_flags & EXT4_GET_BLOCKS_CREATE;
int err;
J_ASSERT(handle != NULL || create == 0);
map.m_lblk = block;
map.m_len = 1;
- err = ext4_map_blocks(handle, inode, &map,
- create ? EXT4_GET_BLOCKS_CREATE : 0);
+ err = ext4_map_blocks(handle, inode, &map, map_flags);
if (err == 0)
return create ? ERR_PTR(-ENOSPC) : NULL;
}
struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct buffer_head *bh;
- bh = ext4_getblk(handle, inode, block, create);
+ bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
if (!bh || buffer_uptodate(bh))
}
/*
- * Reserve a single cluster located at lblock
+ * Reserve space for a single cluster
*/
-static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock)
+static int ext4_da_reserve_space(struct inode *inode)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
- unsigned int md_needed;
int ret;
/*
if (ret)
return ret;
- /*
- * recalculate the amount of metadata blocks to reserve
- * in order to allocate nrblocks
- * worse case is one extent per block
- */
spin_lock(&ei->i_block_reservation_lock);
- /*
- * ext4_calc_metadata_amount() has side effects, which we have
- * to be prepared undo if we fail to claim space.
- */
- md_needed = 0;
- trace_ext4_da_reserve_space(inode, 0);
-
if (ext4_claim_free_clusters(sbi, 1, 0)) {
spin_unlock(&ei->i_block_reservation_lock);
dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1));
return -ENOSPC;
}
ei->i_reserved_data_blocks++;
+ trace_ext4_da_reserve_space(inode);
spin_unlock(&ei->i_block_reservation_lock);
return 0; /* success */
* then we don't need to reserve it again. However we still need
* to reserve metadata for every block we're going to write.
*/
- if (EXT4_SB(inode->i_sb)->s_cluster_ratio <= 1 ||
+ if (EXT4_SB(inode->i_sb)->s_cluster_ratio == 1 ||
!ext4_find_delalloc_cluster(inode, map->m_lblk)) {
- ret = ext4_da_reserve_space(inode, iblock);
+ ret = ext4_da_reserve_space(inode);
if (ret) {
/* not enough space to reserve */
retval = ret;
ext4_walk_page_buffers(handle, page_bufs, 0, len,
NULL, bget_one);
}
- /* As soon as we unlock the page, it can go away, but we have
- * references to buffers so we are safe */
+ /*
+ * We need to release the page lock before we start the
+ * journal, so grab a reference so the page won't disappear
+ * out from under us.
+ */
+ get_page(page);
unlock_page(page);
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
ext4_writepage_trans_blocks(inode));
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
- goto out;
+ put_page(page);
+ goto out_no_pagelock;
}
-
BUG_ON(!ext4_handle_valid(handle));
+ lock_page(page);
+ put_page(page);
+ if (page->mapping != mapping) {
+ /* The page got truncated from under us */
+ ext4_journal_stop(handle);
+ ret = 0;
+ goto out;
+ }
+
if (inline_data) {
BUFFER_TRACE(inode_bh, "get write access");
ret = ext4_journal_get_write_access(handle, inode_bh);
NULL, bput_one);
ext4_set_inode_state(inode, EXT4_STATE_JDATA);
out:
+ unlock_page(page);
+out_no_pagelock:
brelse(inode_bh);
return ret;
}
ext4_journal_stop(handle);
}
- if (attr->ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
+ if (attr->ia_valid & ATTR_SIZE) {
handle_t *handle;
+ loff_t oldsize = inode->i_size;
+ int shrink = (attr->ia_size <= inode->i_size);
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
if (attr->ia_size > sbi->s_bitmap_maxbytes)
return -EFBIG;
}
+ if (!S_ISREG(inode->i_mode))
+ return -EINVAL;
if (IS_I_VERSION(inode) && attr->ia_size != inode->i_size)
inode_inc_iversion(inode);
- if (S_ISREG(inode->i_mode) &&
+ if (ext4_should_order_data(inode) &&
(attr->ia_size < inode->i_size)) {
- if (ext4_should_order_data(inode)) {
- error = ext4_begin_ordered_truncate(inode,
+ error = ext4_begin_ordered_truncate(inode,
attr->ia_size);
- if (error)
- goto err_out;
- }
+ if (error)
+ goto err_out;
+ }
+ if (attr->ia_size != inode->i_size) {
handle = ext4_journal_start(inode, EXT4_HT_INODE, 3);
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
goto err_out;
}
- if (ext4_handle_valid(handle)) {
+ if (ext4_handle_valid(handle) && shrink) {
error = ext4_orphan_add(handle, inode);
orphan = 1;
}
up_write(&EXT4_I(inode)->i_data_sem);
ext4_journal_stop(handle);
if (error) {
- ext4_orphan_del(NULL, inode);
+ if (orphan)
+ ext4_orphan_del(NULL, inode);
goto err_out;
}
- } else {
- loff_t oldsize = inode->i_size;
-
- i_size_write(inode, attr->ia_size);
- pagecache_isize_extended(inode, oldsize, inode->i_size);
}
+ if (!shrink)
+ pagecache_isize_extended(inode, oldsize, inode->i_size);
/*
* Blocks are going to be removed from the inode. Wait
* in data=journal mode to make pages freeable.
*/
truncate_pagecache(inode, inode->i_size);
+ if (shrink)
+ ext4_truncate(inode);
}
- /*
- * We want to call ext4_truncate() even if attr->ia_size ==
- * inode->i_size for cases like truncation of fallocated space
- */
- if (attr->ia_valid & ATTR_SIZE)
- ext4_truncate(inode);
if (!rc) {
setattr_copy(inode, attr);
git.openpandora.org / pandora-kernel.git / blobdiff