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devfs: plug redundant bwillwrite avoidance

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vn_write already checks for vnode type to see if bwillwrite should be called.

This effectively reverts r244643.

Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21905
This commit is contained in:
Mateusz Guzik 2019-10-05 17:44:33 +00:00
parent c36e2d14ac
commit dfa8dae493
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=353126
3 changed files with 0 additions and 15 deletions
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11
sys/fs/devfs/devfs_vnops.c
View file

@ -1137,7 +1137,6 @@ devfs_open(struct vop_open_args *ap)
int error, ref, vlocked;
struct cdevsw *dsw;
struct file *fpop;
struct mtx *mtxp;
if (vp->v_type == VBLK)
return (ENXIO);
@ -1191,16 +1190,6 @@ devfs_open(struct vop_open_args *ap)
#endif
if (fp->f_ops == &badfileops)
finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f);
mtxp = mtx_pool_find(mtxpool_sleep, fp);
/*
* Hint to the dofilewrite() to not force the buffer draining
* on the writer to the file. Most likely, the write would
* not need normal buffers.
*/
mtx_lock(mtxp);
fp->f_vnread_flags |= FDEVFS_VNODE;
mtx_unlock(mtxp);
return (error);
}

3
sys/kern/sys_generic.c
View file

@ -561,9 +561,6 @@ dofilewrite(struct thread *td, int fd, struct file *fp, struct uio *auio,
ktruio = cloneuio(auio);
#endif
cnt = auio->uio_resid;
if (fp->f_type == DTYPE_VNODE &&
(fp->f_vnread_flags & FDEVFS_VNODE) == 0)
bwillwrite();
if ((error = fo_write(fp, auio, td->td_ucred, flags, td))) {
if (auio->uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))

1
sys/sys/file.h
View file

@ -208,7 +208,6 @@ struct file {
#define FOFFSET_LOCKED 0x1
#define FOFFSET_LOCK_WAITING 0x2
#define FDEVFS_VNODE 0x4
#endif /* _KERNEL || _WANT_FILE */