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author | Arnd Bergmann <arnd@arndb.de> | 2018-06-12 15:31:17 +0200 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2019-12-18 18:07:32 +0100 |
commit | bca302651af496615829be13165552a2c160a1a1 (patch) | |
tree | 57e77738a2f94df8af441e5c9a6893fd7f0b4ac2 | |
parent | packet: clarify timestamp overflow (diff) | |
download | linux-bca302651af496615829be13165552a2c160a1a1.tar.xz linux-bca302651af496615829be13165552a2c160a1a1.zip |
hostfs: pass 64-bit timestamps to/from user space
The use of 'struct timespec' is deprecated in the kernel, so we
want to avoid the conversions from/to the proper timespec64
structure.
On the user space side, we have a 'struct timespec' that is defined
by the C library and that will be incompatible with the kernel's
view on 32-bit architectures once they move to a 64-bit time_t,
breaking the shared binary layout of hostfs_iattr and hostfs_stat.
This changes the two structures to use a new hostfs_timespec structure
with fixed 64-bit seconds/nanoseconds for passing the timestamps
between hostfs_kern.c and hostfs_user.c. With a new enough user
space side, this will allow timestamps beyond year 2038.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r-- | fs/hostfs/hostfs.h | 22 | ||||
-rw-r--r-- | fs/hostfs/hostfs_kern.c | 15 |
2 files changed, 22 insertions, 15 deletions
diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h index f4295aa19350..69cb796f6270 100644 --- a/fs/hostfs/hostfs.h +++ b/fs/hostfs/hostfs.h @@ -37,16 +37,20 @@ * is on, and remove the appropriate bits from attr->ia_mode (attr is a * "struct iattr *"). -BlaisorBlade */ +struct hostfs_timespec { + long long tv_sec; + long long tv_nsec; +}; struct hostfs_iattr { - unsigned int ia_valid; - unsigned short ia_mode; - uid_t ia_uid; - gid_t ia_gid; - loff_t ia_size; - struct timespec ia_atime; - struct timespec ia_mtime; - struct timespec ia_ctime; + unsigned int ia_valid; + unsigned short ia_mode; + uid_t ia_uid; + gid_t ia_gid; + loff_t ia_size; + struct hostfs_timespec ia_atime; + struct hostfs_timespec ia_mtime; + struct hostfs_timespec ia_ctime; }; struct hostfs_stat { @@ -56,7 +60,7 @@ struct hostfs_stat { unsigned int uid; unsigned int gid; unsigned long long size; - struct timespec atime, mtime, ctime; + struct hostfs_timespec atime, mtime, ctime; unsigned int blksize; unsigned long long blocks; unsigned int maj; diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index 5a7eb0c79839..e6b8c49076bb 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -549,9 +549,9 @@ static int read_name(struct inode *ino, char *name) set_nlink(ino, st.nlink); i_uid_write(ino, st.uid); i_gid_write(ino, st.gid); - ino->i_atime = timespec_to_timespec64(st.atime); - ino->i_mtime = timespec_to_timespec64(st.mtime); - ino->i_ctime = timespec_to_timespec64(st.ctime); + ino->i_atime = (struct timespec64){ st.atime.tv_sec, st.atime.tv_nsec }; + ino->i_mtime = (struct timespec64){ st.mtime.tv_sec, st.mtime.tv_nsec }; + ino->i_ctime = (struct timespec64){ st.ctime.tv_sec, st.ctime.tv_nsec }; ino->i_size = st.size; ino->i_blocks = st.blocks; return 0; @@ -820,15 +820,18 @@ static int hostfs_setattr(struct dentry *dentry, struct iattr *attr) } if (attr->ia_valid & ATTR_ATIME) { attrs.ia_valid |= HOSTFS_ATTR_ATIME; - attrs.ia_atime = timespec64_to_timespec(attr->ia_atime); + attrs.ia_atime = (struct hostfs_timespec) + { attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec }; } if (attr->ia_valid & ATTR_MTIME) { attrs.ia_valid |= HOSTFS_ATTR_MTIME; - attrs.ia_mtime = timespec64_to_timespec(attr->ia_mtime); + attrs.ia_mtime = (struct hostfs_timespec) + { attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec }; } if (attr->ia_valid & ATTR_CTIME) { attrs.ia_valid |= HOSTFS_ATTR_CTIME; - attrs.ia_ctime = timespec64_to_timespec(attr->ia_ctime); + attrs.ia_ctime = (struct hostfs_timespec) + { attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec }; } if (attr->ia_valid & ATTR_ATIME_SET) { attrs.ia_valid |= HOSTFS_ATTR_ATIME_SET; |