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| author |   Anna Schumaker <Anna.Schumaker@netapp.com> | 2014-09-26 13:58:48 -0400 |
|---|---|---|
| committer |   Trond Myklebust <trond.myklebust@primarydata.com> | 2014-09-30 16:24:56 -0400 |
| commit | 1c6dcbe5ceff81c2cf8d929646af675cd59fe7c0 (patch) | |
| tree | 1e432e1decca1b3a6de427db31db5737d997a7f5 /fs/nfs/nfs4file.c | |
| parent | Merge commit '24bab491220f' into client-4.2 (diff) | |
| download | linux-dev-1c6dcbe5ceff81c2cf8d929646af675cd59fe7c0.tar.xz linux-dev-1c6dcbe5ceff81c2cf8d929646af675cd59fe7c0.zip | |
NFS: Implement SEEK
The SEEK operation is used when an application makes an lseek call with
either the SEEK_HOLE or SEEK_DATA flags set. I fall back on
nfs_file_llseek() if the server does not have SEEK support.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/nfs4file.c')
| -rw-r--r-- | fs/nfs/nfs4file.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index a816f0627a6c..4dffa3a64731 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -8,6 +8,10 @@ #include "fscache.h" #include "pnfs.h" +#ifdef CONFIG_NFS_V4_2 +#include "nfs42.h" +#endif + #define NFSDBG_FACILITY NFSDBG_FILE static int @@ -115,8 +119,29 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) return ret; } +#ifdef CONFIG_NFS_V4_2 +static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) +{ + loff_t ret; + + switch (whence) { + case SEEK_HOLE: + case SEEK_DATA: + ret = nfs42_proc_llseek(filep, offset, whence); + if (ret != -ENOTSUPP) + return ret; + default: + return nfs_file_llseek(filep, offset, whence); + } +} +#endif /* CONFIG_NFS_V4_2 */ + const struct file_operations nfs4_file_operations = { +#ifdef CONFIG_NFS_V4_2 + .llseek = nfs4_file_llseek, +#else .llseek = nfs_file_llseek, +#endif .read = new_sync_read, .write = new_sync_write, .read_iter = nfs_file_read, |