Restore support for F_GET_FILE_RW_HINT and F_SET_FILE_RW_HINT by
reverting commit 7b12e49669c9 ("fs: remove fs.f_write_hint").
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
fs/fcntl.c | 18 ++++++++++++++++++
fs/open.c | 1 +
include/linux/fs.h | 9 +++++++++
3 files changed, 28 insertions(+)
diff --git a/fs/fcntl.c b/fs/fcntl.c
index e871009f6c88..acaa49fb1a35 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -292,6 +292,22 @@ static long fcntl_rw_hint(struct file *file, unsigned int cmd,
u64 h;
switch (cmd) {
+ case F_GET_FILE_RW_HINT:
+ h = file_write_hint(file);
+ if (copy_to_user(argp, &h, sizeof(*argp)))
+ return -EFAULT;
+ return 0;
+ case F_SET_FILE_RW_HINT:
+ if (copy_from_user(&h, argp, sizeof(h)))
+ return -EFAULT;
+ hint = (enum rw_hint) h;
+ if (!rw_hint_valid(hint))
+ return -EINVAL;
+
+ spin_lock(&file->f_lock);
+ file->f_write_hint = hint;
+ spin_unlock(&file->f_lock);
+ return 0;
case F_GET_RW_HINT:
h = inode->i_write_hint;
if (copy_to_user(argp, &h, sizeof(*argp)))
@@ -417,6 +433,8 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
break;
case F_GET_RW_HINT:
case F_SET_RW_HINT:
+ case F_GET_FILE_RW_HINT:
+ case F_SET_FILE_RW_HINT:
err = fcntl_rw_hint(filp, cmd, arg);
break;
default:
diff --git a/fs/open.c b/fs/open.c
index 98f6601fbac6..9e31b8c50cc4 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -942,6 +942,7 @@ static int do_dentry_open(struct file *f,
if (f->f_mapping->a_ops && f->f_mapping->a_ops->direct_IO)
f->f_mode |= FMODE_CAN_ODIRECT;
+ f->f_write_hint = WRITE_LIFE_NOT_SET;
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
f->f_iocb_flags = iocb_flags(f);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4aeb3fa11927..ba2c5c90af6d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1001,6 +1001,7 @@ struct file {
* Must not be taken from IRQ context.
*/
spinlock_t f_lock;
+ enum rw_hint f_write_hint;
fmode_t f_mode;
atomic_long_t f_count;
struct mutex f_pos_lock;
@@ -2134,6 +2135,14 @@ static inline bool HAS_UNMAPPED_ID(struct mnt_idmap *idmap,
!vfsgid_valid(i_gid_into_vfsgid(idmap, inode));
}
+static inline enum rw_hint file_write_hint(struct file *file)
+{
+ if (file->f_write_hint != WRITE_LIFE_NOT_SET)
+ return file->f_write_hint;
+
+ return file_inode(file)->i_write_hint;
+}
+
static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
{
*kiocb = (struct kiocb) {
