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ANDROID: sdcardfs: add read_iter/write_iter opeations

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Adapted from wrapfs
commit f398bf6a7377 ("Wrapfs: add read_iter/write_iter opeations")

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Signed-off-by: Mengyang Li <li.mengyang@stonybrook.edu>
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Bug: 35766959
Change-Id: I2b3de59c9682fc705bf21df0de6df81e76fd2e40
This commit is contained in:
Daniel Rosenberg 2017-03-09 21:48:09 -08:00
parent c4e9b94bcb
commit 9a1e24adfd
1 changed files with 48 additions and 0 deletions
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48
fs/sdcardfs/file.c
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@ -338,6 +338,52 @@ out:
return err; return err;
} }
/*
* Sdcardfs read_iter, redirect modified iocb to lower read_iter
*/
ssize_t sdcardfs_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
int err;
struct file *file = iocb->ki_filp, *lower_file;
lower_file = sdcardfs_lower_file(file);
if (!lower_file->f_op->read_iter) {
err = -EINVAL;
goto out;
}
get_file(lower_file); /* prevent lower_file from being released */
iocb->ki_filp = lower_file;
err = lower_file->f_op->read_iter(iocb, iter);
/* ? wait IO finish to update atime as ecryptfs ? */
iocb->ki_filp = file;
fput(lower_file);
out:
return err;
}
/*
* Sdcardfs write_iter, redirect modified iocb to lower write_iter
*/
ssize_t sdcardfs_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
int err;
struct file *file = iocb->ki_filp, *lower_file;
lower_file = sdcardfs_lower_file(file);
if (!lower_file->f_op->write_iter) {
err = -EINVAL;
goto out;
}
get_file(lower_file); /* prevent lower_file from being released */
iocb->ki_filp = lower_file;
err = lower_file->f_op->write_iter(iocb, iter);
iocb->ki_filp = file;
fput(lower_file);
out:
return err;
}
const struct file_operations sdcardfs_main_fops = { const struct file_operations sdcardfs_main_fops = {
.llseek = generic_file_llseek, .llseek = generic_file_llseek,
@ -353,6 +399,8 @@ const struct file_operations sdcardfs_main_fops = {
.release = sdcardfs_file_release, .release = sdcardfs_file_release,
.fsync = sdcardfs_fsync, .fsync = sdcardfs_fsync,
.fasync = sdcardfs_fasync, .fasync = sdcardfs_fasync,
.read_iter = sdcardfs_read_iter,
.write_iter = sdcardfs_write_iter,
}; };
/* trimmed directory options */ /* trimmed directory options */