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NFS: Do not serialise O_DIRECT reads and writes

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Allow dio requests to be scheduled in parallel, but ensuring that they
do not conflict with buffered I/O.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2016-06-03 17:07:19 -04:00
parent 18290650b1
commit a5864c999d
6 changed files with 174 additions and 37 deletions
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8
fs/nfs/internal.h
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@@ -411,6 +411,14 @@ extern void __exit unregister_nfs_fs(void);
extern bool nfs_sb_active(struct super_block *sb);
extern void nfs_sb_deactive(struct super_block *sb);
/* io.c */
extern void nfs_start_io_read(struct inode *inode);
extern void nfs_end_io_read(struct inode *inode);
extern void nfs_start_io_write(struct inode *inode);
extern void nfs_end_io_write(struct inode *inode);
extern void nfs_start_io_direct(struct inode *inode);
extern void nfs_end_io_direct(struct inode *inode);
/* namespace.c */
#define NFS_PATH_CANONICAL 1
extern char *nfs_path(char **p, struct dentry *dentry,