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

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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_write_begin().

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 12:07:37 +01:00
parent d5abfb1b7b
commit 60b99a1b9f
3 changed files with 23 additions and 25 deletions
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21
fs/udf/file.c
View File

@ -57,25 +57,6 @@ void udf_adinicb_readpage(struct page *page)
kunmap_atomic(kaddr);
}
static int udf_adinicb_write_begin(struct file *file,
struct address_space *mapping, loff_t pos,
unsigned len, struct page **pagep,
void **fsdata)
{
struct page *page;
if (WARN_ON_ONCE(pos >= PAGE_SIZE))
return -EIO;
page = grab_cache_page_write_begin(mapping, 0);
if (!page)
return -ENOMEM;
*pagep = page;
if (!PageUptodate(page))
udf_adinicb_readpage(page);
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)
@ -95,7 +76,7 @@ const struct address_space_operations udf_adinicb_aops = {
.invalidate_folio = block_invalidate_folio,
.read_folio = udf_read_folio,
.writepages = udf_writepages,
.write_begin = udf_adinicb_write_begin,
.write_begin = udf_write_begin,
.write_end = udf_adinicb_write_end,
.direct_IO = udf_direct_IO,
};

24
fs/udf/inode.c
View File

@ -231,16 +231,30 @@ static void udf_readahead(struct readahead_control *rac)
mpage_readahead(rac, udf_get_block);
}
static int udf_write_begin(struct file *file, struct address_space *mapping,
int udf_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
struct page **pagep, void **fsdata)
{
struct udf_inode_info *iinfo = UDF_I(file_inode(file));
struct page *page;
int ret;
ret = block_write_begin(mapping, pos, len, pagep, udf_get_block);
if (unlikely(ret))
udf_write_failed(mapping, pos + len);
return ret;
if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
ret = block_write_begin(mapping, pos, len, pagep,
udf_get_block);
if (unlikely(ret))
udf_write_failed(mapping, pos + len);
return ret;
}
if (WARN_ON_ONCE(pos >= PAGE_SIZE))
return -EIO;
page = grab_cache_page_write_begin(mapping, 0);
if (!page)
return -ENOMEM;
*pagep = page;
if (!PageUptodate(page))
udf_adinicb_readpage(page);
return 0;
}
ssize_t udf_direct_IO(struct kiocb *iocb, struct iov_iter *iter)

3
fs/udf/udfdecl.h
View File

@ -161,6 +161,9 @@ 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);
int udf_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
struct page **pagep, void **fsdata);
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 *);