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| author | Anna Schumaker <Anna.Schumaker@netapp.com> | 2015-03-16 14:06:24 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-04-23 14:36:28 -0400 |
| commit | f830f7ddd9165c8bd69127458627f03df4b1a406 (patch) | |
| tree | fb92b7097ce59629094ea59e0cc3a1cf0acf14be /fs | |
| parent | 9a51940bf65bf9fdc93027d70bdecdfc403c5b24 (diff) | |
| download | lwn-f830f7ddd9165c8bd69127458627f03df4b1a406.tar.gz lwn-f830f7ddd9165c8bd69127458627f03df4b1a406.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/nfs42proc.c | 8 | ||||
| -rw-r--r-- | fs/nfs/nfs4file.c | 9 |
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 */ |