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FROMLIST: fs: Generic function to convert iocb to rw flags

Browse source 
OverlayFS implements its own function to translate iocb flags into rw
flags, so that they can be passed into another vfs call.
With commit ce71bfea207b4 ("fs: align IOCB_* flags with RWF_* flags")
Jens created a 1:1 matching between the iocb flags and rw flags,
simplifying the conversion.

Reduce the OverlayFS code by making the flag conversion function generic
and reusable.

Mot-CRs-fixed: (CR)
Bug: 168023149
Link: https://lore.kernel.org/lkml/20210125153057.3623715-2-balsini@android.com/
Signed-off-by: Alessio Balsini <balsini@android.com>
Change-Id: I74aefeafd6ebbda2fbabee9024474dfe4cc6c2a7
Signed-off-by: Alessio Balsini <balsini@google.com>
Reviewed-on: https://gerrit.mot.com/2014516
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Alessio Balsini 2021-01-25 16:58:50 +00:00 • committed by Xiaojun Ji
commit 7ffec8cda3
2 changed files with 9 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

23
fs/overlayfs/file.c
View file

@ -14,6 +14,8 @@
#include <linux/fs.h>
#include "overlayfs.h"
#define OVL_IOCB_MASK (IOCB_DSYNC | IOCB_HIPRI | IOCB_NOWAIT | IOCB_SYNC)
static char ovl_whatisit(struct inode *inode, struct inode *realinode)
{
if (realinode != ovl_inode_upper(inode))
@ -213,23 +215,6 @@ static void ovl_file_accessed(struct file *file)
touch_atime(&file->f_path);
}
static rwf_t ovl_iocb_to_rwf(struct kiocb *iocb)
{
int ifl = iocb->ki_flags;
rwf_t flags = 0;
if (ifl & IOCB_NOWAIT)
flags |= RWF_NOWAIT;
if (ifl & IOCB_HIPRI)
flags |= RWF_HIPRI;
if (ifl & IOCB_DSYNC)
flags |= RWF_DSYNC;
if (ifl & IOCB_SYNC)
flags |= RWF_SYNC;
return flags;
}
static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
@ -246,7 +231,7 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
old_cred = ovl_override_creds(file_inode(file)->i_sb);
ret = vfs_iter_read(real.file, iter, &iocb->ki_pos,
ovl_iocb_to_rwf(iocb));
iocb_to_rw_flags(iocb->ki_flags, OVL_IOCB_MASK));
ovl_revert_creds(file_inode(file)->i_sb, old_cred);
ovl_file_accessed(file);
@ -281,7 +266,7 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
old_cred = ovl_override_creds(file_inode(file)->i_sb);
file_start_write(real.file);
ret = vfs_iter_write(real.file, iter, &iocb->ki_pos,
ovl_iocb_to_rwf(iocb));
iocb_to_rw_flags(iocb->ki_flags, OVL_IOCB_MASK));
file_end_write(real.file);
ovl_revert_creds(file_inode(file)->i_sb, old_cred);

5
include/linux/fs.h
View file

@ -3527,6 +3527,11 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
return 0;
}
static inline rwf_t iocb_to_rw_flags(int ifl, int iocb_mask)
{
return ifl & iocb_mask;
}
static inline ino_t parent_ino(struct dentry *dentry)
{
ino_t res;