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().
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/udf/file.c | 21 +--------------------
fs/udf/inode.c | 24 +++++++++++++++++++-----
fs/udf/udfdecl.h | 3 +++
3 files changed, 23 insertions(+), 25 deletions(-)
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 6bab6aa7770a..16aecf4b2387 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -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,
};
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 52016c942f68..7f5b2b1f9847 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -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)
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index a851613465c6..32decf6b6a21 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -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 *);
--
2.35.3
