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authorAnna Schumaker <Anna.Schumaker@netapp.com>2015-03-16 14:06:24 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-04-23 14:36:28 -0400
commitf830f7ddd9165c8bd69127458627f03df4b1a406 (patch)
treefb92b7097ce59629094ea59e0cc3a1cf0acf14be
parent9a51940bf65bf9fdc93027d70bdecdfc403c5b24 (diff)
downloadlinux-f830f7ddd9165c8bd69127458627f03df4b1a406.tar.bz2
NFS: Reduce time spent holding the i_mutex during fallocate()
At the very least, we should not be taking the i_mutex until after checking if the server even supports ALLOCATE or DEALLOCATE, allowing v4.0 or v4.1 to exit without potentially waiting on a lock. Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/nfs42proc.c8
-rw-r--r--fs/nfs/nfs4file.c9
2 files changed, 10 insertions, 7 deletions
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index b9aa6bbcc8ed..3a9e75235f30 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -96,9 +96,13 @@ int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
return -EOPNOTSUPP;
+ mutex_lock(&inode->i_mutex);
+
err = nfs42_proc_fallocate(&msg, filep, offset, len);
if (err == -EOPNOTSUPP)
NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
+
+ mutex_unlock(&inode->i_mutex);
return err;
}
@@ -114,11 +118,15 @@ int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
return -EOPNOTSUPP;
nfs_wb_all(inode);
+ mutex_lock(&inode->i_mutex);
+
err = nfs42_proc_fallocate(&msg, filep, offset, len);
if (err == 0)
truncate_pagecache_range(inode, offset, (offset + len) -1);
if (err == -EOPNOTSUPP)
NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
+
+ mutex_unlock(&inode->i_mutex);
return err;
}
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 151ddff624d4..cb3c7879e59f 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -158,14 +158,9 @@ static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t
if (ret < 0)
return ret;
- mutex_lock(&inode->i_mutex);
if (mode & FALLOC_FL_PUNCH_HOLE)
- ret = nfs42_proc_deallocate(filep, offset, len);
- else
- ret = nfs42_proc_allocate(filep, offset, len);
- mutex_unlock(&inode->i_mutex);
-
- return ret;
+ return nfs42_proc_deallocate(filep, offset, len);
+ return nfs42_proc_allocate(filep, offset, len);
}
#endif /* CONFIG_NFS_V4_2 */