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NFS: Remove unnecessary inode locking in nfs_llseek_dir()

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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>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-10-30 17:57:29 -04:00 committed by Anna Schumaker
parent 6c2190b3fc
commit 83f2c45e63
1 changed files with 4 additions and 5 deletions
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9
fs/nfs/dir.c
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@ -955,7 +955,6 @@ out:
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;
}