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replace checking for ->read/->aio_read presence with check in ->f_mode

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Since we are about to introduce new methods (read_iter/write_iter), the
tests in a bunch of places would have to grow inconveniently.  Check
once (at open() time) and store results in ->f_mode as FMODE_CAN_READ
and FMODE_CAN_WRITE resp.  It might end up being a temporary measure -
once everything switches from ->aio_{read,write} to ->{read,write}_iter
it might make sense to return to open-coded checks.  We'll see...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-02-11 17:49:24 -05:00
parent b318891929
commit 7f7f25e82d
6 changed files with 23 additions and 11 deletions
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4
fs/file_table.c
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@ -175,6 +175,10 @@ struct file *alloc_file(struct path *path, fmode_t mode,
file->f_path = *path;
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
if ((mode & FMODE_READ) && likely(fop->read || fop->aio_read))
mode |= FMODE_CAN_READ;
if ((mode & FMODE_WRITE) && likely(fop->write || fop->aio_write))
mode |= FMODE_CAN_WRITE;
file->f_mode = mode;
file->f_op = fop;
if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)