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tmpfs: support for file creation time 

Various filesystems (including ext4) now support file creation time.
This adds such support for tmpfs-based filesystems.

Note that using shmem_getattr() on other file types than regular
requires that shmem_is_huge() check type, to stop incorrect
HPAGE_PMD_SIZE blksize.

[hughd@google.com: three tweaks to creation time patch]
  Link: https://lkml.kernel.org/r/b954973a-b8d1-cab8-63bd-6ea8063de3@google.com

Link: https://lkml.kernel.org/r/20220314211150.GA123458@xavier-xps
Link: https://lkml.kernel.org/r/b954973a-b8d1-cab8-63bd-6ea8063de3@google.com
Link: https://lkml.kernel.org/r/20220211213628.GA1919658@xavier-xps
Signed-off-by: Xavier Roche <xavier.roche@algolia.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Tested-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Sylvain Bellone <sylvain.bellone@algolia.com>
Reported-by: Xavier Grand <xavier.grand@algolia.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xavier Roche 2022-03-22 14:39:55 -07:00 committed by Linus Torvalds
parent 914c32e45d
commit f7cd16a558
2 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/shmem_fs.h
View File

@ -24,6 +24,7 @@ struct shmem_inode_info {
struct shared_policy policy; /* NUMA memory alloc policy */
struct simple_xattrs xattrs; /* list of xattrs */
atomic_t stop_eviction; /* hold when working on inode */
struct timespec64 i_crtime; /* file creation time */
struct inode vfs_inode;
};

16
mm/shmem.c
View File

@ -476,6 +476,8 @@ bool shmem_is_huge(struct vm_area_struct *vma,
{
loff_t i_size;
if (!S_ISREG(inode->i_mode))
return false;
if (shmem_huge == SHMEM_HUGE_DENY)
return false;
if (vma && ((vma->vm_flags & VM_NOHUGEPAGE) ||
@ -1061,6 +1063,12 @@ static int shmem_getattr(struct user_namespace *mnt_userns,
if (shmem_is_huge(NULL, inode, 0))
stat->blksize = HPAGE_PMD_SIZE;
if (request_mask & STATX_BTIME) {
stat->result_mask |= STATX_BTIME;
stat->btime.tv_sec = info->i_crtime.tv_sec;
stat->btime.tv_nsec = info->i_crtime.tv_nsec;
}
return 0;
}
@ -1854,9 +1862,6 @@ repeat:
return 0;
}
/* Never use a huge page for shmem_symlink() */
if (S_ISLNK(inode->i_mode))
goto alloc_nohuge;
if (!shmem_is_huge(vma, inode, index))
goto alloc_nohuge;
@ -2265,6 +2270,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
atomic_set(&info->stop_eviction, 0);
info->seals = F_SEAL_SEAL;
info->flags = flags & VM_NORESERVE;
info->i_crtime = inode->i_mtime;
INIT_LIST_HEAD(&info->shrinklist);
INIT_LIST_HEAD(&info->swaplist);
simple_xattrs_init(&info->xattrs);
@ -3196,6 +3202,7 @@ static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size)
#endif /* CONFIG_TMPFS_XATTR */
static const struct inode_operations shmem_short_symlink_operations = {
.getattr = shmem_getattr,
.get_link = simple_get_link,
#ifdef CONFIG_TMPFS_XATTR
.listxattr = shmem_listxattr,
@ -3203,6 +3210,7 @@ static const struct inode_operations shmem_short_symlink_operations = {
};
static const struct inode_operations shmem_symlink_inode_operations = {
.getattr = shmem_getattr,
.get_link = shmem_get_link,
#ifdef CONFIG_TMPFS_XATTR
.listxattr = shmem_listxattr,
@ -3790,6 +3798,7 @@ static const struct inode_operations shmem_inode_operations = {
static const struct inode_operations shmem_dir_inode_operations = {
#ifdef CONFIG_TMPFS
.getattr = shmem_getattr,
.create = shmem_create,
.lookup = simple_lookup,
.link = shmem_link,
@ -3811,6 +3820,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
};
static const struct inode_operations shmem_special_inode_operations = {
.getattr = shmem_getattr,
#ifdef CONFIG_TMPFS_XATTR
.listxattr = shmem_listxattr,
#endif