diff options
| author |   Steve French <stfrench@microsoft.com> | 2019-08-27 23:58:54 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-09-16 11:43:37 -0500 |
| commit | 83bbfa706dda668deb60e96df20327fc79e1716f (patch) | |
| tree | d9682e25e2b3219df510e4f3002c105adf5f36f1 /fs/cifs/connect.c | |
| parent | cifs: fix dereference on ses before it is null checked (diff) | |
| download | linux-dev-83bbfa706dda668deb60e96df20327fc79e1716f.tar.xz linux-dev-83bbfa706dda668deb60e96df20327fc79e1716f.zip | |
smb3: add mount option to allow forced caching of read only share
If a share is immutable (at least for the period that it will
be mounted) it would be helpful to not have to revalidate
dentries repeatedly that we know can not be changed remotely.
Add "cache=" option (cache=ro) for mounting read only shares
in order to improve performance in cases in which we know that
the share will not be changing while it is in use.
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to '')
| -rw-r--r-- | fs/cifs/connect.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 1efbbfffddba..4e622953dd5a 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -298,6 +298,7 @@ enum { Opt_cache_loose, Opt_cache_strict, Opt_cache_none, + Opt_cache_ro, Opt_cache_err }; @@ -305,6 +306,7 @@ static const match_table_t cifs_cacheflavor_tokens = { { Opt_cache_loose, "loose" }, { Opt_cache_strict, "strict" }, { Opt_cache_none, "none" }, + { Opt_cache_ro, "ro" }, { Opt_cache_err, NULL } }; @@ -1418,14 +1420,22 @@ cifs_parse_cache_flavor(char *value, struct smb_vol *vol) case Opt_cache_loose: vol->direct_io = false; vol->strict_io = false; + vol->cache_ro = false; break; case Opt_cache_strict: vol->direct_io = false; vol->strict_io = true; + vol->cache_ro = false; break; case Opt_cache_none: vol->direct_io = true; vol->strict_io = false; + vol->cache_ro = false; + break; + case Opt_cache_ro: + vol->direct_io = false; + vol->strict_io = false; + vol->cache_ro = true; break; default: cifs_dbg(VFS, "bad cache= option: %s\n", value); @@ -4041,6 +4051,10 @@ int cifs_setup_cifs_sb(struct smb_vol *pvolume_info, cifs_dbg(FYI, "mounting share using direct i/o\n"); cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; } + 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; + } if (pvolume_info->mfsymlinks) { if (pvolume_info->sfu_emul) { /* |