* [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir()
@ 2020-10-30 21:57 trondmy
2020-10-30 21:57 ` [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir() trondmy
2020-11-03 11:13 ` [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() Benjamin Coddington
0 siblings, 2 replies; 4+ messages in thread
From: trondmy @ 2020-10-30 21:57 UTC (permalink / raw)
To: linux-nfs
From: Trond Myklebust <trond.myklebust@hammerspace.com>
Remove the contentious inode lock, and instead provide thread safety
using the file->f_lock spinlock.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/dir.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index cb52db9a0cfb..e56b1bd99537 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -955,7 +955,6 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
{
- struct inode *inode = file_inode(filp);
struct nfs_open_dir_context *dir_ctx = filp->private_data;
dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n",
@@ -967,15 +966,15 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
case SEEK_SET:
if (offset < 0)
return -EINVAL;
- inode_lock(inode);
+ spin_lock(&filp->f_lock);
break;
case SEEK_CUR:
if (offset == 0)
return filp->f_pos;
- inode_lock(inode);
+ spin_lock(&filp->f_lock);
offset += filp->f_pos;
if (offset < 0) {
- inode_unlock(inode);
+ spin_unlock(&filp->f_lock);
return -EINVAL;
}
}
@@ -987,7 +986,7 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
dir_ctx->dir_cookie = 0;
dir_ctx->duped = 0;
}
- inode_unlock(inode);
+ spin_unlock(&filp->f_lock);
return offset;
}
--
2.28.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir()
2020-10-30 21:57 [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() trondmy
@ 2020-10-30 21:57 ` trondmy
2020-11-03 11:14 ` Benjamin Coddington
2020-11-03 11:13 ` [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() Benjamin Coddington
1 sibling, 1 reply; 4+ messages in thread
From: trondmy @ 2020-10-30 21:57 UTC (permalink / raw)
To: linux-nfs
From: Trond Myklebust <trond.myklebust@hammerspace.com>
nfs_inc_stats() is already thread-safe, and there are no other reasons
to hold the inode lock here.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/dir.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e56b1bd99537..4e011adaf967 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -997,13 +997,9 @@ static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence)
static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end,
int datasync)
{
- struct inode *inode = file_inode(filp);
-
dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync);
- inode_lock(inode);
- nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
- inode_unlock(inode);
+ nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC);
return 0;
}
--
2.28.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir()
2020-10-30 21:57 [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() trondmy
2020-10-30 21:57 ` [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir() trondmy
@ 2020-11-03 11:13 ` Benjamin Coddington
1 sibling, 0 replies; 4+ messages in thread
From: Benjamin Coddington @ 2020-11-03 11:13 UTC (permalink / raw)
To: trondmy; +Cc: linux-nfs
On 30 Oct 2020, at 17:57, trondmy@kernel.org wrote:
> From: Trond Myklebust <trond.myklebust@hammerspace.com>
>
> Remove the contentious inode lock, and instead provide thread safety
> using the file->f_lock spinlock.
>
> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Ben
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir()
2020-10-30 21:57 ` [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir() trondmy
@ 2020-11-03 11:14 ` Benjamin Coddington
0 siblings, 0 replies; 4+ messages in thread
From: Benjamin Coddington @ 2020-11-03 11:14 UTC (permalink / raw)
To: trondmy; +Cc: linux-nfs
On 30 Oct 2020, at 17:57, trondmy@kernel.org wrote:
> From: Trond Myklebust <trond.myklebust@hammerspace.com>
>
> nfs_inc_stats() is already thread-safe, and there are no other reasons
> to hold the inode lock here.
>
> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Ben
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-11-03 11:14 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-10-30 21:57 [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() trondmy
2020-10-30 21:57 ` [PATCH 2/2] NFS: Remove unnecessary inode lock in nfs_fsync_dir() trondmy
2020-11-03 11:14 ` Benjamin Coddington
2020-11-03 11:13 ` [PATCH 1/2] NFS: Remove unnecessary inode locking in nfs_llseek_dir() Benjamin Coddington
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