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fs: add ctime accessors infrastructure

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struct timespec64 has unused bits in the tv_nsec field that can be used
for other purposes. In future patches, we're going to change how the
inode->i_ctime is accessed in certain inodes in order to make use of
them. In order to do that safely though, we'll need to eradicate raw
accesses of the inode->i_ctime field from the kernel.

Add new accessor functions for the ctime that we use to replace them.

Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Message-Id: <20230705185812.579118-2-jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jeff Layton 2023-07-05 14:58:10 -04:00 committed by Christian Brauner
parent bc2390f2c8
commit 9b6304c1d5
2 changed files with 60 additions and 1 deletions
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16
fs/inode.c
View File

@ -2501,6 +2501,22 @@ struct timespec64 current_time(struct inode *inode)
}
EXPORT_SYMBOL(current_time);
/**
* inode_set_ctime_current - set the ctime to current_time
* @inode: inode
*
* Set the inode->i_ctime to the current value for the inode. Returns
* the current value that was assigned to i_ctime.
*/
struct timespec64 inode_set_ctime_current(struct inode *inode)
{
struct timespec64 now = current_time(inode);
inode_set_ctime(inode, now.tv_sec, now.tv_nsec);
return now;
}
EXPORT_SYMBOL(inode_set_ctime_current);
/**
* in_group_or_capable - check whether caller is CAP_FSETID privileged
* @idmap: idmap of the mount @inode was found from

45
include/linux/fs.h
View File

@ -1474,7 +1474,50 @@ static inline bool fsuidgid_has_mapping(struct super_block *sb,
kgid_has_mapping(fs_userns, kgid);
}
extern struct timespec64 current_time(struct inode *inode);
struct timespec64 current_time(struct inode *inode);
struct timespec64 inode_set_ctime_current(struct inode *inode);
/**
* inode_get_ctime - fetch the current ctime from the inode
* @inode: inode from which to fetch ctime
*
* Grab the current ctime from the inode and return it.
*/
static inline struct timespec64 inode_get_ctime(const struct inode *inode)
{
return inode->i_ctime;
}
/**
* inode_set_ctime_to_ts - set the ctime in the inode
* @inode: inode in which to set the ctime
* @ts: value to set in the ctime field
*
* Set the ctime in @inode to @ts
*/
static inline struct timespec64 inode_set_ctime_to_ts(struct inode *inode,
struct timespec64 ts)
{
inode->i_ctime = ts;
return ts;
}
/**
* inode_set_ctime - set the ctime in the inode
* @inode: inode in which to set the ctime
* @sec: tv_sec value to set
* @nsec: tv_nsec value to set
*
* Set the ctime in @inode to { @sec, @nsec }
*/
static inline struct timespec64 inode_set_ctime(struct inode *inode,
time64_t sec, long nsec)
{
struct timespec64 ts = { .tv_sec = sec,
.tv_nsec = nsec };
return inode_set_ctime_to_ts(inode, ts);
}
/*
* Snapshotting support.