diff options
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index c3270aaa2b75..d035acab5b2a 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3451,6 +3451,22 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, return 0; } +static int ext4_iomap_overwrite_begin(struct inode *inode, loff_t offset, + loff_t length, unsigned flags, struct iomap *iomap, + struct iomap *srcmap) +{ + int ret; + + /* + * Even for writes we don't need to allocate blocks, so just pretend + * we are reading to save overhead of starting a transaction. + */ + flags &= ~IOMAP_WRITE; + ret = ext4_iomap_begin(inode, offset, length, flags, iomap, srcmap); + WARN_ON_ONCE(iomap->type != IOMAP_MAPPED); + return ret; +} + static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length, ssize_t written, unsigned flags, struct iomap *iomap) { @@ -3472,6 +3488,11 @@ const struct iomap_ops ext4_iomap_ops = { .iomap_end = ext4_iomap_end, }; +const struct iomap_ops ext4_iomap_overwrite_ops = { + .iomap_begin = ext4_iomap_overwrite_begin, + .iomap_end = ext4_iomap_end, +}; + static bool ext4_iomap_is_delalloc(struct inode *inode, struct ext4_map_blocks *map) { |