Add cifs_match_super to use in sget to share superblock between mounts that have the same //server/sharename, credentials and mount options. It helps us to improve performance on work with future SMB2.1 leases.
Signed-off-by: Pavel Shilovsky <[email protected]> --- fs/cifs/cifsfs.c | 6 ++- fs/cifs/connect.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 97 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index c40c1f4..abc8436 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -577,14 +577,16 @@ cifs_do_mount(struct file_system_type *fs_type, if (rc) return ERR_PTR(rc); - sb = sget(fs_type, NULL, set_anon_super, NULL); + sb = sget(fs_type, cifs_match_super, set_anon_super, volume_info); if (IS_ERR(sb)) { cifs_cleanup_volume_info(&volume_info); return ERR_CAST(sb); } - if (sb->s_fs_info) + if (sb->s_fs_info) { + cFYI(1, "Use existing superblock"); goto out; + } sb->s_flags = flags; diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 53b79e7..7c98c36 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2193,6 +2193,99 @@ cifs_put_tlink(struct tcon_link *tlink) return; } +static void setup_cifs_sb(struct smb_vol *vol, struct cifs_sb_info *sb); +static inline struct tcon_link * +cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb); + +static const u32 ACTUAL_MOUNT_FLAGS = CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | + CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | CIFS_MOUNT_NO_XATTR | + CIFS_MOUNT_MAP_SPECIAL_CHR | CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | + CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | CIFS_MOUNT_OVERR_GID | + CIFS_MOUNT_DYNPERM | CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | + CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | CIFS_MOUNT_MULTIUSER | + CIFS_MOUNT_STRICT_IO; + +static int +compare_mount_options(struct super_block *sb, struct smb_vol *vol) +{ + struct cifs_sb_info *old = CIFS_SB(sb), new; + + setup_cifs_sb(vol, &new); + + if ((old->mnt_cifs_flags & ACTUAL_MOUNT_FLAGS) != + (new.mnt_cifs_flags & ACTUAL_MOUNT_FLAGS)) + return 0; + + if (old->rsize != new.rsize || old->wsize != new.wsize) + return 0; + + if (old->mnt_uid != new.mnt_uid || old->mnt_gid != new.mnt_gid) + return 0; + + if (old->mnt_file_mode != new.mnt_file_mode || + old->mnt_dir_mode != new.mnt_dir_mode) + return 0; + + if (old->prepathlen != new.prepathlen || + strncmp(old->prepath, new.prepath, old->prepathlen)) + return 0; + + if (strcmp(old->local_nls->charset, vol->local_nls->charset)) + return 0; + + if (old->actimeo != new.actimeo) + return 0; + + return 1; +} + +int +cifs_match_super(struct super_block *sb, void *data) +{ + struct smb_vol *volume_info = (struct smb_vol *) data; + struct TCP_Server_Info *tcp_srv; + struct cifs_ses *ses; + struct cifs_tcon *tcon; + struct cifs_sb_info *cifs_sb; + struct tcon_link *tlink; + struct sockaddr_storage addr; + int rc = 0; + + memset(&addr, 0, sizeof(struct sockaddr_storage)); + + spin_lock(&cifs_tcp_ses_lock); + cifs_sb = CIFS_SB(sb); + tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); + if (IS_ERR(tlink)) + goto out; + tcon = tlink_tcon(tlink); + ses = tcon->ses; + tcp_srv = ses->server; + + if (!volume_info->UNCip || !volume_info->UNC) + goto out; + + rc = cifs_fill_sockaddr((struct sockaddr *)&addr, + volume_info->UNCip, + strlen(volume_info->UNCip), + volume_info->port); + if (!rc) + goto out; + + if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) || + !match_session(ses, volume_info) || + !match_tcon(tcon, volume_info->UNC)) { + rc = 0; + goto out; + } + + rc = compare_mount_options(sb, volume_info); +out: + cifs_put_tlink(tlink); + spin_unlock(&cifs_tcp_ses_lock); + return rc; +} + int get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path, const struct nls_table *nls_codepage, unsigned int *pnum_referrals, -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
