Y2038 June 2018

y2038@lists.linaro.org

69 participants
93 discussions

[PATCH] afs: use a consistent interpretation of time values

by Arnd Bergmann

afs uses 32-bit timestamps everywhere, but mixes signed and unsigned usage, which is a bit inconsistent. In particular on 32-bit machines, it currently uses unsigned timestamps (ranging from 1970 to 2106) for locally modified files, but signed timestamps (rand 1902 to 2038) when reading from a remote end. On 64-bit machines, we always interpret timestamps as unsigned here. This replaces the deprecated time_t and get_seconds() interfaces with the modern time64_t and current_time() to locally store 64-bit timestamps, taking care to use unsigned interpretation of the raw values everywhere, which avoids the y2038 overflow and is consistent with the previous usage on 64-bit machines. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/afs/afs.h | 6 +++--- fs/afs/inode.c | 4 +--- 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/afs/afs.h b/fs/afs/afs.h index b4ff1f7ae4ab..6ca50c293553 100644 --- a/fs/afs/afs.h +++ b/fs/afs/afs.h @@ -129,8 +129,8 @@ typedef u32 afs_access_t; struct afs_file_status { u64 size; /* file size */ afs_dataversion_t data_version; /* current data version */ - time_t mtime_client; /* last time client changed data */ - time_t mtime_server; /* last time server changed data */ + time64_t mtime_client; /* last time client changed data */ + time64_t mtime_server; /* last time server changed data */ unsigned abort_code; /* Abort if bulk-fetching this failed */ afs_file_type_t type; /* file type */ @@ -158,7 +158,7 @@ struct afs_file_status { * AFS volume synchronisation information */ struct afs_volsync { - time_t creation; /* volume creation time */ + time64_t creation; /* volume creation time */ }; /* diff --git a/fs/afs/inode.c b/fs/afs/inode.c index 479b7fdda124..0507e52e3330 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -213,9 +213,7 @@ struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root) set_nlink(inode, 2); inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; - inode->i_ctime.tv_sec = get_seconds(); - inode->i_ctime.tv_nsec = 0; - inode->i_atime = inode->i_mtime = inode->i_ctime; + inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode); inode->i_blocks = 0; inode_set_iversion_raw(inode, 0); inode->i_generation = 0; -- 2.9.0

6 years, 6 months

[PATCH] udf: convert inode stamps to timespec64

by Arnd Bergmann

The VFS structures are finally converted to always use 64-bit timestamps, and this file system can represent a long range of on-disk timestamps already, so now let's fit in the missing bits for udf. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/udf/ialloc.c | 2 +- fs/udf/inode.c | 45 ++++++++++++++++----------------------------- fs/udf/super.c | 8 ++++---- fs/udf/udf_i.h | 2 +- fs/udf/udf_sb.h | 2 +- fs/udf/udfdecl.h | 4 ++-- fs/udf/udftime.c | 4 ++-- 7 files changed, 27 insertions(+), 40 deletions(-) diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c index 56569023783b..f8e5872f7cc2 100644 --- a/fs/udf/ialloc.c +++ b/fs/udf/ialloc.c @@ -125,7 +125,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode) else iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); - iinfo->i_crtime = timespec64_to_timespec(inode->i_mtime); + iinfo->i_crtime = inode->i_mtime; if (unlikely(insert_inode_locked(inode) < 0)) { make_bad_inode(inode); iput(inode); diff --git a/fs/udf/inode.c b/fs/udf/inode.c index 7f39d17352c9..75e0b2683e47 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -1271,7 +1271,6 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode) struct udf_inode_info *iinfo = UDF_I(inode); struct udf_sb_info *sbi = UDF_SB(inode->i_sb); struct kernel_lb_addr *iloc = &iinfo->i_location; - struct timespec ts; unsigned int link_count; unsigned int indirections = 0; int bs = inode->i_sb->s_blocksize; @@ -1444,12 +1443,9 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode) inode->i_blocks = le64_to_cpu(fe->logicalBlocksRecorded) << (inode->i_sb->s_blocksize_bits - 9); - udf_disk_stamp_to_time(&ts, fe->accessTime); - inode->i_atime = timespec_to_timespec64(ts); - udf_disk_stamp_to_time(&ts, fe->modificationTime); - inode->i_mtime = timespec_to_timespec64(ts); - udf_disk_stamp_to_time(&ts, fe->attrTime); - inode->i_ctime = timespec_to_timespec64(ts); + udf_disk_stamp_to_time(&inode->i_atime, fe->accessTime); + udf_disk_stamp_to_time(&inode->i_mtime, fe->modificationTime); + udf_disk_stamp_to_time(&inode->i_ctime, fe->attrTime); iinfo->i_unique = le64_to_cpu(fe->uniqueID); iinfo->i_lenEAttr = le32_to_cpu(fe->lengthExtendedAttr); @@ -1459,13 +1455,10 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode) inode->i_blocks = le64_to_cpu(efe->logicalBlocksRecorded) << (inode->i_sb->s_blocksize_bits - 9); - udf_disk_stamp_to_time(&ts, efe->accessTime); - inode->i_atime = timespec_to_timespec64(ts); - udf_disk_stamp_to_time(&ts, efe->modificationTime); - inode->i_mtime = timespec_to_timespec64(ts); + udf_disk_stamp_to_time(&inode->i_atime, efe->accessTime); + udf_disk_stamp_to_time(&inode->i_mtime, efe->modificationTime); udf_disk_stamp_to_time(&iinfo->i_crtime, efe->createTime); - udf_disk_stamp_to_time(&ts, efe->attrTime); - inode->i_ctime = timespec_to_timespec64(ts); + udf_disk_stamp_to_time(&inode->i_ctime, efe->attrTime); iinfo->i_unique = le64_to_cpu(efe->uniqueID); iinfo->i_lenEAttr = le32_to_cpu(efe->lengthExtendedAttr); @@ -1602,7 +1595,7 @@ static int udf_sync_inode(struct inode *inode) return udf_update_inode(inode, 1); } -static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec time) +static void udf_adjust_time(struct udf_inode_info *iinfo, struct timespec64 time) { if (iinfo->i_crtime.tv_sec > time.tv_sec || (iinfo->i_crtime.tv_sec == time.tv_sec && @@ -1715,12 +1708,9 @@ static int udf_update_inode(struct inode *inode, int do_sync) inode->i_sb->s_blocksize - sizeof(struct fileEntry)); fe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); - udf_time_to_disk_stamp(&fe->accessTime, - timespec64_to_timespec(inode->i_atime)); - udf_time_to_disk_stamp(&fe->modificationTime, - timespec64_to_timespec(inode->i_mtime)); - udf_time_to_disk_stamp(&fe->attrTime, - timespec64_to_timespec(inode->i_ctime)); + udf_time_to_disk_stamp(&fe->accessTime, inode->i_atime); + udf_time_to_disk_stamp(&fe->modificationTime, inode->i_mtime); + udf_time_to_disk_stamp(&fe->attrTime, inode->i_ctime); memset(&(fe->impIdent), 0, sizeof(struct regid)); strcpy(fe->impIdent.ident, UDF_ID_DEVELOPER); fe->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; @@ -1739,17 +1729,14 @@ static int udf_update_inode(struct inode *inode, int do_sync) efe->objectSize = cpu_to_le64(inode->i_size); efe->logicalBlocksRecorded = cpu_to_le64(lb_recorded); - udf_adjust_time(iinfo, timespec64_to_timespec(inode->i_atime)); - udf_adjust_time(iinfo, timespec64_to_timespec(inode->i_mtime)); - udf_adjust_time(iinfo, timespec64_to_timespec(inode->i_ctime)); + udf_adjust_time(iinfo, inode->i_atime); + udf_adjust_time(iinfo, inode->i_mtime); + udf_adjust_time(iinfo, inode->i_ctime); - udf_time_to_disk_stamp(&efe->accessTime, - timespec64_to_timespec(inode->i_atime)); - udf_time_to_disk_stamp(&efe->modificationTime, - timespec64_to_timespec(inode->i_mtime)); + udf_time_to_disk_stamp(&efe->accessTime, inode->i_atime); + udf_time_to_disk_stamp(&efe->modificationTime, inode->i_mtime); udf_time_to_disk_stamp(&efe->createTime, iinfo->i_crtime); - udf_time_to_disk_stamp(&efe->attrTime, - timespec64_to_timespec(inode->i_ctime)); + udf_time_to_disk_stamp(&efe->attrTime, inode->i_ctime); memset(&(efe->impIdent), 0, sizeof(efe->impIdent)); strcpy(efe->impIdent.ident, UDF_ID_DEVELOPER); diff --git a/fs/udf/super.c b/fs/udf/super.c index 0c504c8031d3..3040dc2a32f6 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -1980,7 +1980,7 @@ static void udf_open_lvid(struct super_block *sb) struct buffer_head *bh = sbi->s_lvid_bh; struct logicalVolIntegrityDesc *lvid; struct logicalVolIntegrityDescImpUse *lvidiu; - struct timespec ts; + struct timespec64 ts; if (!bh) return; @@ -1992,7 +1992,7 @@ static void udf_open_lvid(struct super_block *sb) mutex_lock(&sbi->s_alloc_mutex); lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; - ktime_get_real_ts(&ts); + ktime_get_real_ts64(&ts); udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE) lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); @@ -2017,7 +2017,7 @@ static void udf_close_lvid(struct super_block *sb) struct buffer_head *bh = sbi->s_lvid_bh; struct logicalVolIntegrityDesc *lvid; struct logicalVolIntegrityDescImpUse *lvidiu; - struct timespec ts; + struct timespec64 ts; if (!bh) return; @@ -2029,7 +2029,7 @@ static void udf_close_lvid(struct super_block *sb) mutex_lock(&sbi->s_alloc_mutex); lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; - ktime_get_real_ts(&ts); + ktime_get_real_ts64(&ts); udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts); if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); diff --git a/fs/udf/udf_i.h b/fs/udf/udf_i.h index 630426ffb775..2ef0e212f08a 100644 --- a/fs/udf/udf_i.h +++ b/fs/udf/udf_i.h @@ -28,7 +28,7 @@ struct udf_ext_cache { */ struct udf_inode_info { - struct timespec i_crtime; + struct timespec64 i_crtime; /* Physical address of inode */ struct kernel_lb_addr i_location; __u64 i_unique; diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index 9dd3e1b9619e..9424d7cab790 100644 --- a/fs/udf/udf_sb.h +++ b/fs/udf/udf_sb.h @@ -138,7 +138,7 @@ struct udf_sb_info { rwlock_t s_cred_lock; /* Root Info */ - struct timespec s_record_time; + struct timespec64 s_record_time; /* Fileset Info */ __u16 s_serial_number; diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h index bae311b59400..4b8e1c111340 100644 --- a/fs/udf/udfdecl.h +++ b/fs/udf/udfdecl.h @@ -253,8 +253,8 @@ extern struct long_ad *udf_get_filelongad(uint8_t *, int, uint32_t *, int); extern struct short_ad *udf_get_fileshortad(uint8_t *, int, uint32_t *, int); /* udftime.c */ -extern void udf_disk_stamp_to_time(struct timespec *dest, +extern void udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src); -extern void udf_time_to_disk_stamp(struct timestamp *dest, struct timespec src); +extern void udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 src); #endif /* __UDF_DECL_H */ diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c index 67b33ac5d41b..784371994c2a 100644 --- a/fs/udf/udftime.c +++ b/fs/udf/udftime.c @@ -41,7 +41,7 @@ #include <linux/time.h> void -udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src) +udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src) { u16 typeAndTimezone = le16_to_cpu(src.typeAndTimezone); u16 year = le16_to_cpu(src.year); @@ -70,7 +70,7 @@ udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src) } void -udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts) +udf_time_to_disk_stamp(struct timestamp *dest, struct timespec64 ts) { long seconds; int16_t offset; -- 2.9.0

6 years, 6 months

[PATCH] adfs: use timespec64 for time conversion

by Arnd Bergmann

We just truncate the seconds to 32-bit in one place now, so this can trivially be converted over to using timespec64 consistently. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/adfs/inode.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c index c836c425ca94..3f3c3b7ec82e 100644 --- a/fs/adfs/inode.c +++ b/fs/adfs/inode.c @@ -167,7 +167,7 @@ adfs_mode2atts(struct super_block *sb, struct inode *inode) * of time to convert from RISC OS epoch to Unix epoch. */ static void -adfs_adfs2unix_time(struct timespec *tv, struct inode *inode) +adfs_adfs2unix_time(struct timespec64 *tv, struct inode *inode) { unsigned int high, low; /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since @@ -195,11 +195,11 @@ adfs_adfs2unix_time(struct timespec *tv, struct inode *inode) /* convert from RISC OS to Unix epoch */ nsec -= nsec_unix_epoch_diff_risc_os_epoch; - *tv = ns_to_timespec(nsec); + *tv = ns_to_timespec64(nsec); return; cur_time: - *tv = timespec64_to_timespec(current_time(inode)); + *tv = current_time(inode); return; too_early: @@ -242,7 +242,6 @@ adfs_unix2adfs_time(struct inode *inode, unsigned int secs) struct inode * adfs_iget(struct super_block *sb, struct object_info *obj) { - struct timespec ts; struct inode *inode; inode = new_inode(sb); @@ -271,9 +270,7 @@ adfs_iget(struct super_block *sb, struct object_info *obj) ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000); inode->i_mode = adfs_atts2mode(sb, inode); - ts = timespec64_to_timespec(inode->i_mtime); - adfs_adfs2unix_time(&ts, inode); - inode->i_mtime = timespec_to_timespec64(ts); + adfs_adfs2unix_time(&inode->i_mtime, inode); inode->i_atime = inode->i_mtime; inode->i_ctime = inode->i_mtime; -- 2.9.0

6 years, 6 months

[PATCH] procfs: uptime: use ktime_get_boottime_ts64

by Arnd Bergmann

get_monotonic_boottime() is deprecated and uses the old timespec type. Let's convert /proc/uptime to use ktime_get_boottime_ts64(). Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/proc/uptime.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c index 3f723cb478af..a4c2791ab70b 100644 --- a/fs/proc/uptime.c +++ b/fs/proc/uptime.c @@ -9,7 +9,7 @@ static int uptime_proc_show(struct seq_file *m, void *v) { - struct timespec uptime; + struct timespec64 uptime; struct timespec64 idle; u64 nsec; u32 rem; @@ -19,7 +19,7 @@ static int uptime_proc_show(struct seq_file *m, void *v) for_each_possible_cpu(i) nsec += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE]; - get_monotonic_boottime(&uptime); + ktime_get_boottime_ts64(&uptime); idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); idle.tv_nsec = rem; seq_printf(m, "%lu.%02lu %lu.%02lu\n", -- 2.9.0

6 years, 6 months

[PATCH] sysvfs: use ktime_get_real_seconds() for superblock stamp

by Arnd Bergmann

get_seconds() is deprecated in favor of ktime_get_real_seconds(), which returns a 64-bit timestamp. In the SYSV file system, the superblock timestamp is only 32 bits wide, and it is used to check whether a file system is clean, so the best solution seems to be to force a wraparound and explicitly convert it to an unsigned 32-bit value. This is independent of the inode timestamps that are also 32-bit wide on disk and that come from current_time(). Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/sysv/inode.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c index bec9f79adb25..499a20a5a010 100644 --- a/fs/sysv/inode.c +++ b/fs/sysv/inode.c @@ -35,7 +35,7 @@ static int sysv_sync_fs(struct super_block *sb, int wait) { struct sysv_sb_info *sbi = SYSV_SB(sb); - unsigned long time = get_seconds(), old_time; + u32 time = (u32)ktime_get_real_seconds(), old_time; mutex_lock(&sbi->s_lock); @@ -46,8 +46,8 @@ static int sysv_sync_fs(struct super_block *sb, int wait) */ old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); if (sbi->s_type == FSTYPE_SYSV4) { - if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) - *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); + if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38u - old_time)) + *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38u - time); *sbi->s_sb_time = cpu_to_fs32(sbi, time); mark_buffer_dirty(sbi->s_bh2); } -- 2.9.0

6 years, 6 months

[PATCH] ufs: use ktime_get_real_seconds for sb and cg timestamps

by Arnd Bergmann

get_seconds() is deprecated because of the 32-bit overflow and will be removed. All callers in ufs also truncate to a 32-bit number, so nothing changes during the conversion, but this should be harmless as the superblock and cylinder group timestamps are not visible to user space, except for checking the fs-dirty state, wich works fine across the overflow. This moves the call to get_seconds() into a new inline function, with a comment explaining the constraints, while converting it to ktime_get_real_seconds(). Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/ufs/balloc.c | 4 ++-- fs/ufs/ialloc.c | 2 +- fs/ufs/super.c | 4 ++-- fs/ufs/util.h | 14 ++++++++++++++ 4 files changed, 19 insertions(+), 5 deletions(-) diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c index e727ee07dbe4..075d3d9114c8 100644 --- a/fs/ufs/balloc.c +++ b/fs/ufs/balloc.c @@ -547,7 +547,7 @@ static u64 ufs_add_fragments(struct inode *inode, u64 fragment, /* * Block can be extended */ - ucg->cg_time = cpu_to_fs32(sb, get_seconds()); + ucg->cg_time = ufs_get_seconds(sb); for (i = newcount; i < (uspi->s_fpb - fragoff); i++) if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_freeoff, fragno + i)) break; @@ -639,7 +639,7 @@ static u64 ufs_alloc_fragments(struct inode *inode, unsigned cgno, if (!ufs_cg_chkmagic(sb, ucg)) ufs_panic (sb, "ufs_alloc_fragments", "internal error, bad magic number on cg %u", cgno); - ucg->cg_time = cpu_to_fs32(sb, get_seconds()); + ucg->cg_time = ufs_get_seconds(sb); if (count == uspi->s_fpb) { result = ufs_alloccg_block (inode, ucpi, goal, err); diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c index e1ef0f0a1353..c678fff2a04d 100644 --- a/fs/ufs/ialloc.c +++ b/fs/ufs/ialloc.c @@ -89,7 +89,7 @@ void ufs_free_inode (struct inode * inode) if (!ufs_cg_chkmagic(sb, ucg)) ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number"); - ucg->cg_time = cpu_to_fs32(sb, get_seconds()); + ucg->cg_time = ufs_get_seconds(sb); is_directory = S_ISDIR(inode->i_mode); diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 488088141451..a4e07e910f1b 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -698,7 +698,7 @@ static int ufs_sync_fs(struct super_block *sb, int wait) usb1 = ubh_get_usb_first(uspi); usb3 = ubh_get_usb_third(uspi); - usb1->fs_time = cpu_to_fs32(sb, get_seconds()); + usb1->fs_time = ufs_get_seconds(sb); if ((flags & UFS_ST_MASK) == UFS_ST_SUN || (flags & UFS_ST_MASK) == UFS_ST_SUNOS || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) @@ -1342,7 +1342,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) */ if (*mount_flags & SB_RDONLY) { ufs_put_super_internal(sb); - usb1->fs_time = cpu_to_fs32(sb, get_seconds()); + usb1->fs_time = ufs_get_seconds(sb); if ((flags & UFS_ST_MASK) == UFS_ST_SUN || (flags & UFS_ST_MASK) == UFS_ST_SUNOS || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) diff --git a/fs/ufs/util.h b/fs/ufs/util.h index 1907be6d5808..1fd3011ea623 100644 --- a/fs/ufs/util.h +++ b/fs/ufs/util.h @@ -590,3 +590,17 @@ static inline int ufs_is_data_ptr_zero(struct ufs_sb_private_info *uspi, else return *(__fs32 *)p == 0; } + +static inline __fs32 ufs_get_seconds(struct super_block *sbp) +{ + time64_t now = ktime_get_real_seconds(); + + /* Signed 32-bit interpretation wraps around in 2038, which + * happens in ufs1 inode stamps but not ufs2 using 64-bits + * stamps. For superblock and blockgroup, let's assume + * unsigned 32-bit stamps, which are good until y2106. + * Wrap around rather than clamp here to make the dirty + * file system detection work in the superblock stamp. + */ + return cpu_to_fs32(sbp, lower_32_bits(now)); +} -- 2.9.0

6 years, 6 months

[PATCH 1/3] reiserfs: remove unused j_timestamp

by Arnd Bergmann

This uses the deprecated time_t type but is write-only, so we can just remove it. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/reiserfs/journal.c | 1 - fs/reiserfs/reiserfs.h | 1 - 2 files changed, 2 deletions(-) diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c index 52eb5d293a34..1e7f733b2a12 100644 --- a/fs/reiserfs/journal.c +++ b/fs/reiserfs/journal.c @@ -4110,7 +4110,6 @@ static int do_journal_end(struct reiserfs_transaction_handle *th, int flags) atomic_set(&jl->j_older_commits_done, 0); jl->j_trans_id = journal->j_trans_id; - jl->j_timestamp = journal->j_trans_start_time; jl->j_commit_bh = c_bh; jl->j_start = journal->j_start; jl->j_len = journal->j_len; diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h index ae4811fecc1f..1536ebbaf6ab 100644 --- a/fs/reiserfs/reiserfs.h +++ b/fs/reiserfs/reiserfs.h @@ -271,7 +271,6 @@ struct reiserfs_journal_list { struct mutex j_commit_mutex; unsigned int j_trans_id; - time_t j_timestamp; struct reiserfs_list_bitmap *j_list_bitmap; struct buffer_head *j_commit_bh; /* commit buffer head */ struct reiserfs_journal_cnode *j_realblock; -- 2.9.0

6 years, 6 months

[PATCH] shmem: use monotonic time for i_generation

by Arnd Bergmann

get_seconds() is deprecated because it will lead to a 32-bit overflow in 2038 or 2106. We don't need the i_generation to be strictly monotonic anyway, and other file systems like ext4 and xfs just use prandom_u32(), so let's use the same one here. If this is considered too slow, we could also use ktime_get_seconds() or ktime_get_real_seconds() to keep the previous behavior. Both of these return a time64_t and are not deprecated, but only return a unique value once per second, and are predictable. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- mm/shmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/shmem.c b/mm/shmem.c index 2cab84403055..387ae5323f56 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -29,6 +29,7 @@ #include <linux/pagemap.h> #include <linux/file.h> #include <linux/mm.h> +#include <linux/random.h> #include <linux/sched/signal.h> #include <linux/export.h> #include <linux/swap.h> @@ -2187,7 +2188,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode inode_init_owner(inode, dir, mode); inode->i_blocks = 0; inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); - inode->i_generation = get_seconds(); + inode->i_generation = prandom_u32(); info = SHMEM_I(inode); memset(info, 0, (char *)inode - (char *)info); spin_lock_init(&info->lock); -- 2.9.0

6 years, 6 months

[PATCH] fuse: convert last timespec use to timespec64

by Arnd Bergmann

All of fuse uses 64-bit timestamps with the exception of the fuse_change_attributes(), so let's convert this one as well. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/fuse/inode.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index a24df8861b40..3c71eb062ef2 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -208,7 +208,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, struct fuse_inode *fi = get_fuse_inode(inode); bool is_wb = fc->writeback_cache; loff_t oldsize; - struct timespec old_mtime; + struct timespec64 old_mtime; spin_lock(&fc->lock); if ((attr_version != 0 && fi->attr_version > attr_version) || @@ -217,7 +217,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, return; } - old_mtime = timespec64_to_timespec(inode->i_mtime); + old_mtime = inode->i_mtime; fuse_change_attributes_common(inode, attr, attr_valid); oldsize = inode->i_size; @@ -237,7 +237,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, truncate_pagecache(inode, attr->size); inval = true; } else if (fc->auto_inval_data) { - struct timespec new_mtime = { + struct timespec64 new_mtime = { .tv_sec = attr->mtime, .tv_nsec = attr->mtimensec, }; @@ -246,7 +246,7 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, * Auto inval mode also checks and invalidates if mtime * has changed. */ - if (!timespec_equal(&old_mtime, &new_mtime)) + if (!timespec64_equal(&old_mtime, &new_mtime)) inval = true; } -- 2.9.0

6 years, 6 months

[PATCH] ocfs2: dlmglue: clean up timestamp handling

by Arnd Bergmann

The handling of timestamps outside of the 1970..2038 range in the dlm glue is rather inconsistent: on 32-bit architectures, this has always wrapped around to negative timestamps in the 1902..1969 range, while on 64-bit kernels all timestamps are interpreted as positive 34 bit numbers in the 1970..2514 year range. Now that the VFS code handles 64-bit timestamps on all architectures, we can make the behavior more consistent here, and return the same result that we had on 64-bit already, making the file system y2038 safe in the process. Outside of dlmglue, it already uses 64-bit on-disk timestamps anway, so that part is fine. For consistency, I'm changing ocfs2_pack_timespec() to clamp anything outside of the supported range to the minimum and maximum values. This avoids a possible ambiguity of values before 1970 in particular, which used to be interpreted as times at the end of the 2514 range previously. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/ocfs2/dlmglue.c | 26 +++++++++----------------- 1 file changed, 9 insertions(+), 17 deletions(-) diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 0ff424c6d17c..50610a9ed9f4 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -2121,10 +2121,10 @@ static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, /* LVB only has room for 64 bits of time here so we pack it for * now. */ -static u64 ocfs2_pack_timespec(struct timespec *spec) +static u64 ocfs2_pack_timespec(struct timespec64 *spec) { u64 res; - u64 sec = spec->tv_sec; + u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); u32 nsec = spec->tv_nsec; res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); @@ -2140,7 +2140,6 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode) struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; struct ocfs2_meta_lvb *lvb; - struct timespec ts; lvb = ocfs2_dlm_lvb(&lockres->l_lksb); @@ -2161,15 +2160,12 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode) lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); lvb->lvb_imode = cpu_to_be16(inode->i_mode); lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); - ts = timespec64_to_timespec(inode->i_atime); lvb->lvb_iatime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); - ts = timespec64_to_timespec(inode->i_ctime); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); lvb->lvb_ictime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); - ts = timespec64_to_timespec(inode->i_mtime); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); lvb->lvb_imtime_packed = - cpu_to_be64(ocfs2_pack_timespec(&ts)); + cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); @@ -2178,7 +2174,7 @@ static void __ocfs2_stuff_meta_lvb(struct inode *inode) mlog_meta_lvb(0, lockres); } -static void ocfs2_unpack_timespec(struct timespec *spec, +static void ocfs2_unpack_timespec(struct timespec64 *spec, u64 packed_time) { spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; @@ -2187,7 +2183,6 @@ static void ocfs2_unpack_timespec(struct timespec *spec, static void ocfs2_refresh_inode_from_lvb(struct inode *inode) { - struct timespec ts; struct ocfs2_inode_info *oi = OCFS2_I(inode); struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; struct ocfs2_meta_lvb *lvb; @@ -2215,15 +2210,12 @@ static void ocfs2_refresh_inode_from_lvb(struct inode *inode) i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); inode->i_mode = be16_to_cpu(lvb->lvb_imode); set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_atime, be64_to_cpu(lvb->lvb_iatime_packed)); - inode->i_atime = timespec_to_timespec64(ts); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_mtime, be64_to_cpu(lvb->lvb_imtime_packed)); - inode->i_mtime = timespec_to_timespec64(ts); - ocfs2_unpack_timespec(&ts, + ocfs2_unpack_timespec(&inode->i_ctime, be64_to_cpu(lvb->lvb_ictime_packed)); - inode->i_ctime = timespec_to_timespec64(ts); spin_unlock(&oi->ip_lock); } -- 2.9.0

6 years, 6 months

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Y2038 June 2018