diff options
| author | Steve French <stfrench@microsoft.com> | 2019-08-30 10:12:41 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-09-16 19:43:38 +0300 |
| commit | 41e033fecdc891da629113c4f8ee80500b7656d6 (patch) | |
| tree | 4a5814b5751e18229462828564d644b9b724d5fc /fs/cifs/connect.c | |
| parent | 1981ebaabd88a9b3e550b6163c570a498c32a1f5 (diff) | |
| download | linux-41e033fecdc891da629113c4f8ee80500b7656d6.tar.xz | |
smb3: add mount option to allow RW caching of share accessed by only 1 client
If a share is known to be only to be accessed by one client, we
can aggressively cache writes not just reads to it.
Add "cache=" option (cache=singleclient) for mounting read write shares
(that will not be read or written to from other clients while we have
it mounted) in order to improve performance.
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/connect.c')
| -rw-r--r-- | fs/cifs/connect.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 072c01f4e9c1..d9a995588c74 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -299,6 +299,7 @@ enum { Opt_cache_strict, Opt_cache_none, Opt_cache_ro, + Opt_cache_rw, Opt_cache_err }; @@ -307,6 +308,7 @@ static const match_table_t cifs_cacheflavor_tokens = { { Opt_cache_strict, "strict" }, { Opt_cache_none, "none" }, { Opt_cache_ro, "ro" }, + { Opt_cache_rw, "singleclient" }, { Opt_cache_err, NULL } }; @@ -1421,21 +1423,31 @@ cifs_parse_cache_flavor(char *value, struct smb_vol *vol) vol->direct_io = false; vol->strict_io = false; vol->cache_ro = false; + vol->cache_rw = false; break; case Opt_cache_strict: vol->direct_io = false; vol->strict_io = true; vol->cache_ro = false; + vol->cache_rw = false; break; case Opt_cache_none: vol->direct_io = true; vol->strict_io = false; vol->cache_ro = false; + vol->cache_rw = false; break; case Opt_cache_ro: vol->direct_io = false; vol->strict_io = false; vol->cache_ro = true; + vol->cache_rw = false; + break; + case Opt_cache_rw: + vol->direct_io = false; + vol->strict_io = false; + vol->cache_ro = false; + vol->cache_rw = true; break; default: cifs_dbg(VFS, "bad cache= option: %s\n", value); @@ -4054,6 +4066,10 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, if (pvolume_info->cache_ro) { cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n"); cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE; + } else if (pvolume_info->cache_rw) { + cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n"); + cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE | + CIFS_MOUNT_RW_CACHE); } if (pvolume_info->mfsymlinks) { if (pvolume_info->sfu_emul) { @@ -4203,8 +4219,10 @@ static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, if (tcon->fsDevInfo.DeviceCharacteristics & FILE_READ_ONLY_DEVICE) cifs_dbg(VFS, "mounted to read only share\n"); - else + else if ((cifs_sb->mnt_cifs_flags & + CIFS_MOUNT_RW_CACHE) == 0) cifs_dbg(VFS, "read only mount of RW share\n"); + /* no need to log a RW mount of a typical RW share */ } } |