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ext4: move inode extension check out from ext4_iomap_alloc()

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Lift the inode extension/orphan list handling code out from
ext4_iomap_alloc() and apply it within the ext4_dax_write_iter().

Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/fd5c84db25d5d0da87d97ed4c36fd844f57da759.1572949325.git.mbobrowski@mbobrowski.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Matthew Bobrowski 2019-11-05 23:02:08 +11:00 committed by Theodore Ts'o
parent 569342dc24
commit 0b9f230b94
2 changed files with 23 additions and 23 deletions
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22
fs/ext4/file.c
View File

@ -323,6 +323,8 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret;
size_t count;
loff_t offset;
handle_t *handle;
bool extend = false;
struct inode *inode = file_inode(iocb->ki_filp);
if (!inode_trylock(inode)) {
@ -342,7 +344,27 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
offset = iocb->ki_pos;
count = iov_iter_count(from);
if (offset + count > EXT4_I(inode)->i_disksize) {
handle = ext4_journal_start(inode, EXT4_HT_INODE, 2);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
}
ret = ext4_orphan_add(handle, inode);
if (ret) {
ext4_journal_stop(handle);
goto out;
}
extend = true;
ext4_journal_stop(handle);
}
ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops);
if (extend)
ret = ext4_handle_inode_extension(inode, offset, ret, count);
out:
inode_unlock(inode);

22
fs/ext4/inode.c
View File

@ -3494,7 +3494,6 @@ static int ext4_iomap_alloc(struct inode *inode, struct ext4_map_blocks *map,
unsigned int flags)
{
handle_t *handle;
u8 blkbits = inode->i_blkbits;
int ret, dio_credits, retries = 0;
/*
@ -3517,28 +3516,7 @@ static int ext4_iomap_alloc(struct inode *inode, struct ext4_map_blocks *map,
return PTR_ERR(handle);
ret = ext4_map_blocks(handle, inode, map, EXT4_GET_BLOCKS_CREATE_ZERO);
if (ret < 0)
goto journal_stop;
/*
* If we've allocated blocks beyond EOF, we need to ensure that they're
* truncated if we crash before updating the inode size metadata within
* ext4_iomap_end(). For faults, we don't need to do that (and cannot
* due to orphan list operations needing an inode_lock()). If we happen
* to instantiate blocks beyond EOF, it is because we race with a
* truncate operation, which already has added the inode onto the
* orphan list.
*/
if (!(flags & IOMAP_FAULT) && map->m_lblk + map->m_len >
(i_size_read(inode) + (1 << blkbits) - 1) >> blkbits) {
int err;
err = ext4_orphan_add(handle, inode);
if (err < 0)
ret = err;
}
journal_stop:
ext4_journal_stop(handle);
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;