From e721f504cf46a0c84741ba2137d7a052d79436db Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Wed, 3 Apr 2013 16:11:32 +1100 Subject: [PATCH] xfs: implement extended feature masks The version 5 superblock has extended feature masks for compatible, incompatible and read-only compatible feature sets. Implement the masking and mount-time checking for these feature masks. Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- fs/xfs/xfs_log_recover.c | 19 +++++++++++ fs/xfs/xfs_mount.c | 48 +++++++++++++++++++++++---- fs/xfs/xfs_sb.h | 70 ++++++++++++++++++++++++++++++++++++++-- 3 files changed, 129 insertions(+), 8 deletions(-) diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 5303b3db3c98..35ac5044ddfd 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -3959,6 +3959,25 @@ xlog_recover( return error; } + /* + * Version 5 superblock log feature mask validation. We know the + * log is dirty so check if there are any unknown log features + * in what we need to recover. If there are unknown features + * (e.g. unsupported transactions, then simply reject the + * attempt at recovery before touching anything. + */ + if (XFS_SB_VERSION_NUM(&log->l_mp->m_sb) == XFS_SB_VERSION_5 && + xfs_sb_has_incompat_log_feature(&log->l_mp->m_sb, + XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)) { + xfs_warn(log->l_mp, +"Superblock has unknown incompatible log features (0x%x) enabled.\n" +"The log can not be fully and/or safely recovered by this kernel.\n" +"Please recover the log on a kernel that supports the unknown features.", + (log->l_mp->m_sb.sb_features_log_incompat & + XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN)); + return EINVAL; + } + xfs_notice(log->l_mp, "Starting recovery (logdev: %s)", log->l_mp->m_logname ? log->l_mp->m_logname : "internal"); diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 140136cf2dc0..f6bfbd734669 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -114,7 +114,9 @@ static const struct { { offsetof(xfs_sb_t, sb_features_compat), 0 }, { offsetof(xfs_sb_t, sb_features_ro_compat), 0 }, { offsetof(xfs_sb_t, sb_features_incompat), 0 }, + { offsetof(xfs_sb_t, sb_features_log_incompat), 0 }, { offsetof(xfs_sb_t, sb_crc), 0 }, + { offsetof(xfs_sb_t, sb_pad), 0 }, { offsetof(xfs_sb_t, sb_pquotino), 0 }, { offsetof(xfs_sb_t, sb_lsn), 0 }, { sizeof(xfs_sb_t), 0 } @@ -334,14 +336,45 @@ xfs_mount_validate_sb( } /* - * Do not allow Version 5 superblocks to mount right now, even though - * support is in place. We need to implement the proper feature masks - * first. + * Version 5 superblock feature mask validation. Reject combinations the + * kernel cannot support up front before checking anything else. */ if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) { xfs_alert(mp, - "Version 5 superblock detected. Experimental support not yet enabled!"); - return XFS_ERROR(EINVAL); +"Version 5 superblock detected. This kernel has EXPERIMENTAL support enabled!\n" +"Use of these features in this kernel is at your own risk!"); + + if (xfs_sb_has_compat_feature(sbp, + XFS_SB_FEAT_COMPAT_UNKNOWN)) { + xfs_warn(mp, +"Superblock has unknown compatible features (0x%x) enabled.\n" +"Using a more recent kernel is recommended.", + (sbp->sb_features_compat & + XFS_SB_FEAT_COMPAT_UNKNOWN)); + } + + if (xfs_sb_has_ro_compat_feature(sbp, + XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { + xfs_alert(mp, +"Superblock has unknown read-only compatible features (0x%x) enabled.", + (sbp->sb_features_ro_compat & + XFS_SB_FEAT_RO_COMPAT_UNKNOWN)); + if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { + xfs_warn(mp, +"Attempted to mount read-only compatible filesystem read-write.\n" +"Filesystem can only be safely mounted read only."); + return XFS_ERROR(EINVAL); + } + } + if (xfs_sb_has_incompat_feature(sbp, + XFS_SB_FEAT_INCOMPAT_UNKNOWN)) { + xfs_warn(mp, +"Superblock has unknown incompatible features (0x%x) enabled.\n" +"Filesystem can not be safely mounted by this kernel.", + (sbp->sb_features_incompat & + XFS_SB_FEAT_INCOMPAT_UNKNOWN)); + return XFS_ERROR(EINVAL); + } } if (unlikely( @@ -580,6 +613,9 @@ xfs_sb_from_disk( to->sb_features_compat = be32_to_cpu(from->sb_features_compat); to->sb_features_ro_compat = be32_to_cpu(from->sb_features_ro_compat); to->sb_features_incompat = be32_to_cpu(from->sb_features_incompat); + to->sb_features_log_incompat = + be32_to_cpu(from->sb_features_log_incompat); + to->sb_pad = 0; to->sb_pquotino = be64_to_cpu(from->sb_pquotino); to->sb_lsn = be64_to_cpu(from->sb_lsn); } @@ -786,7 +822,7 @@ reread: if (bp->b_error) { error = bp->b_error; if (loud) - xfs_warn(mp, "SB validate failed"); + xfs_warn(mp, "SB validate failed with error %d.", error); goto release_buf; } diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h index 457fefae5683..2de58a85833c 100644 --- a/fs/xfs/xfs_sb.h +++ b/fs/xfs/xfs_sb.h @@ -168,8 +168,10 @@ typedef struct xfs_sb { __uint32_t sb_features_compat; __uint32_t sb_features_ro_compat; __uint32_t sb_features_incompat; + __uint32_t sb_features_log_incompat; __uint32_t sb_crc; /* superblock crc */ + __uint32_t sb_pad; xfs_ino_t sb_pquotino; /* project quota inode */ xfs_lsn_t sb_lsn; /* last write sequence */ @@ -250,8 +252,10 @@ typedef struct xfs_dsb { __be32 sb_features_compat; __be32 sb_features_ro_compat; __be32 sb_features_incompat; + __be32 sb_features_log_incompat; __le32 sb_crc; /* superblock crc */ + __be32 sb_pad; __be64 sb_pquotino; /* project quota inode */ __be64 sb_lsn; /* last write sequence */ @@ -276,7 +280,8 @@ typedef enum { XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG, XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT, XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_FEATURES_COMPAT, - XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT, XFS_SBS_CRC, + XFS_SBS_FEATURES_RO_COMPAT, XFS_SBS_FEATURES_INCOMPAT, + XFS_SBS_FEATURES_LOG_INCOMPAT, XFS_SBS_CRC, XFS_SBS_PAD, XFS_SBS_PQUOTINO, XFS_SBS_LSN, XFS_SBS_FIELDCOUNT } xfs_sb_field_t; @@ -306,6 +311,7 @@ typedef enum { #define XFS_SB_FEATURES_COMPAT XFS_SB_MVAL(FEATURES_COMPAT) #define XFS_SB_FEATURES_RO_COMPAT XFS_SB_MVAL(FEATURES_RO_COMPAT) #define XFS_SB_FEATURES_INCOMPAT XFS_SB_MVAL(FEATURES_INCOMPAT) +#define XFS_SB_FEATURES_LOG_INCOMPAT XFS_SB_MVAL(FEATURES_LOG_INCOMPAT) #define XFS_SB_CRC XFS_SB_MVAL(CRC) #define XFS_SB_PQUOTINO XFS_SB_MVAL(PQUOTINO) #define XFS_SB_NUM_BITS ((int)XFS_SBS_FIELDCOUNT) @@ -316,7 +322,8 @@ typedef enum { XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \ XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \ XFS_SB_BAD_FEATURES2 | XFS_SB_FEATURES_COMPAT | \ - XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | XFS_SB_PQUOTINO) + XFS_SB_FEATURES_RO_COMPAT | XFS_SB_FEATURES_INCOMPAT | \ + XFS_SB_FEATURES_LOG_INCOMPAT | XFS_SB_PQUOTINO) /* @@ -552,6 +559,65 @@ static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp) return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5; } + +/* + * Extended v5 superblock feature masks. These are to be used for new v5 + * superblock features only. + * + * Compat features are new features that old kernels will not notice or affect + * and so can mount read-write without issues. + * + * RO-Compat (read only) are features that old kernels can read but will break + * if they write. Hence only read-only mounts of such filesystems are allowed on + * kernels that don't support the feature bit. + * + * InCompat features are features which old kernels will not understand and so + * must not mount. + * + * Log-InCompat features are for changes to log formats or new transactions that + * can't be replayed on older kernels. The fields are set when the filesystem is + * mounted, and a clean unmount clears the fields. + */ +#define XFS_SB_FEAT_COMPAT_ALL 0 +#define XFS_SB_FEAT_COMPAT_UNKNOWN ~XFS_SB_FEAT_COMPAT_ALL +static inline bool +xfs_sb_has_compat_feature( + struct xfs_sb *sbp, + __uint32_t feature) +{ + return (sbp->sb_features_compat & feature) != 0; +} + +#define XFS_SB_FEAT_RO_COMPAT_ALL 0 +#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL +static inline bool +xfs_sb_has_ro_compat_feature( + struct xfs_sb *sbp, + __uint32_t feature) +{ + return (sbp->sb_features_ro_compat & feature) != 0; +} + +#define XFS_SB_FEAT_INCOMPAT_ALL 0 +#define XFS_SB_FEAT_INCOMPAT_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_ALL +static inline bool +xfs_sb_has_incompat_feature( + struct xfs_sb *sbp, + __uint32_t feature) +{ + return (sbp->sb_features_incompat & feature) != 0; +} + +#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0 +#define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN ~XFS_SB_FEAT_INCOMPAT_LOG_ALL +static inline bool +xfs_sb_has_incompat_log_feature( + struct xfs_sb *sbp, + __uint32_t feature) +{ + return (sbp->sb_features_log_incompat & feature) != 0; +} + /* * end of superblock version macros */ -- 2.20.1