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Message-ID: <20241105193514.828616-3-vinicius.gomes@intel.com>
Date: Tue, 5 Nov 2024 11:35:12 -0800
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: brauner@...nel.org,
amir73il@...il.com,
hu1.chen@...el.com
Cc: miklos@...redi.hu,
malini.bhandaru@...el.com,
tim.c.chen@...el.com,
mikko.ylinen@...el.com,
linux-unionfs@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH overlayfs-next v3 2/4] fs/backing-file: Convert to revert/override_creds_light()
As the credentials used by backing-file are long lived in relation to
the critical section (override_creds() -> revert_creds()) we can
replace them by their lighter alternatives.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
fs/backing-file.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/backing-file.c b/fs/backing-file.c
index a38737592ec7..526ddb4d6f76 100644
--- a/fs/backing-file.c
+++ b/fs/backing-file.c
@@ -176,7 +176,7 @@ ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter,
!(file->f_mode & FMODE_CAN_ODIRECT))
return -EINVAL;
- old_cred = override_creds(ctx->cred);
+ old_cred = override_creds_light(ctx->cred);
if (is_sync_kiocb(iocb)) {
rwf_t rwf = iocb_to_rw_flags(flags);
@@ -197,7 +197,7 @@ ssize_t backing_file_read_iter(struct file *file, struct iov_iter *iter,
backing_aio_cleanup(aio, ret);
}
out:
- revert_creds(old_cred);
+ revert_creds_light(old_cred);
if (ctx->accessed)
ctx->accessed(iocb->ki_filp);
@@ -233,7 +233,7 @@ ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter,
*/
flags &= ~IOCB_DIO_CALLER_COMP;
- old_cred = override_creds(ctx->cred);
+ old_cred = override_creds_light(ctx->cred);
if (is_sync_kiocb(iocb)) {
rwf_t rwf = iocb_to_rw_flags(flags);
@@ -264,7 +264,7 @@ ssize_t backing_file_write_iter(struct file *file, struct iov_iter *iter,
backing_aio_cleanup(aio, ret);
}
out:
- revert_creds(old_cred);
+ revert_creds_light(old_cred);
return ret;
}
@@ -281,9 +281,9 @@ ssize_t backing_file_splice_read(struct file *in, struct kiocb *iocb,
if (WARN_ON_ONCE(!(in->f_mode & FMODE_BACKING)))
return -EIO;
- old_cred = override_creds(ctx->cred);
+ old_cred = override_creds_light(ctx->cred);
ret = vfs_splice_read(in, &iocb->ki_pos, pipe, len, flags);
- revert_creds(old_cred);
+ revert_creds_light(old_cred);
if (ctx->accessed)
ctx->accessed(iocb->ki_filp);
@@ -310,11 +310,11 @@ ssize_t backing_file_splice_write(struct pipe_inode_info *pipe,
if (ret)
return ret;
- old_cred = override_creds(ctx->cred);
+ old_cred = override_creds_light(ctx->cred);
file_start_write(out);
ret = out->f_op->splice_write(pipe, out, &iocb->ki_pos, len, flags);
file_end_write(out);
- revert_creds(old_cred);
+ revert_creds_light(old_cred);
if (ctx->end_write)
ctx->end_write(iocb, ret);
@@ -337,9 +337,9 @@ int backing_file_mmap(struct file *file, struct vm_area_struct *vma,
vma_set_file(vma, file);
- old_cred = override_creds(ctx->cred);
+ old_cred = override_creds_light(ctx->cred);
ret = call_mmap(vma->vm_file, vma);
- revert_creds(old_cred);
+ revert_creds_light(old_cred);
if (ctx->accessed)
ctx->accessed(vma->vm_file);
--
2.47.0
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