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udf: Convert in-ICB files to use udf_direct_IO() 

Switching address_space_operations while a file is used is difficult to
do in a race-free way. To be able to use single address_space_operations
in UDF, make in-ICB files use udf_direct_IO().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2023-01-24 11:59:32 +01:00
parent 79d3c6dbad
commit d5abfb1b7b
3 changed files with 6 additions and 8 deletions
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8
fs/udf/file.c
View File

@ -76,12 +76,6 @@ static int udf_adinicb_write_begin(struct file *file,
return 0;
}
static ssize_t udf_adinicb_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
/* Fallback to buffered I/O. */
return 0;
}
static int udf_adinicb_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
@ -103,7 +97,7 @@ const struct address_space_operations udf_adinicb_aops = {
.writepages = udf_writepages,
.write_begin = udf_adinicb_write_begin,
.write_end = udf_adinicb_write_end,
.direct_IO = udf_adinicb_direct_IO,
.direct_IO = udf_direct_IO,
};
static vm_fault_t udf_page_mkwrite(struct vm_fault *vmf)

5
fs/udf/inode.c
View File

@ -243,7 +243,7 @@ static int udf_write_begin(struct file *file, struct address_space *mapping,
return ret;
}
static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -251,6 +251,9 @@ static ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
size_t count = iov_iter_count(iter);
ssize_t ret;
/* Fallback to buffered IO for in-ICB files */
if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
return 0;
ret = blockdev_direct_IO(iocb, inode, iter, udf_get_block);
if (unlikely(ret < 0 && iov_iter_rw(iter) == WRITE))
udf_write_failed(mapping, iocb->ki_pos + count);

1
fs/udf/udfdecl.h
View File

@ -161,6 +161,7 @@ extern void udf_evict_inode(struct inode *);
extern int udf_write_inode(struct inode *, struct writeback_control *wbc);
int udf_read_folio(struct file *file, struct folio *folio);
int udf_writepages(struct address_space *mapping, struct writeback_control *wbc);
ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, sector_t *);
int udf_get_block(struct inode *, sector_t, struct buffer_head *, int);