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statx: Include a mask for stx_attributes in struct statx

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Include a mask in struct stat to indicate which bits of stx_attributes the
filesystem actually supports.

This would also be useful if we add another system call that allows you to
do a 'bulk attribute set' and pass in a statx struct with the masks
appropriately set to say what you want to set.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2017-03-31 18:32:17 +01:00 committed by Al Viro
parent 47071aee6a
commit 3209f68b3c
5 changed files with 18 additions and 6 deletions
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6
fs/ext4/inode.c
View file

@ -5413,6 +5413,12 @@ int ext4_getattr(const struct path *path, struct kstat *stat,
if (flags & EXT4_NODUMP_FL)
stat->attributes |= STATX_ATTR_NODUMP;
stat->attributes_mask |= (STATX_ATTR_APPEND |
STATX_ATTR_COMPRESSED |
STATX_ATTR_ENCRYPTED |
STATX_ATTR_IMMUTABLE |
STATX_ATTR_NODUMP);
generic_fillattr(inode, stat);
return 0;
}

1
fs/stat.c
View file

@ -527,6 +527,7 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
tmp.stx_ino = stat->ino;
tmp.stx_size = stat->size;
tmp.stx_blocks = stat->blocks;
tmp.stx_attributes_mask = stat->attributes_mask;
tmp.stx_atime.tv_sec = stat->atime.tv_sec;
tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
tmp.stx_btime.tv_sec = stat->btime.tv_sec;

1
include/linux/stat.h
View file

@ -26,6 +26,7 @@ struct kstat {
unsigned int nlink;
uint32_t blksize; /* Preferred I/O size */
u64 attributes;
u64 attributes_mask;
#define KSTAT_ATTR_FS_IOC_FLAGS \
(STATX_ATTR_COMPRESSED | \
STATX_ATTR_IMMUTABLE | \

4
include/uapi/linux/stat.h
View file

@ -114,7 +114,7 @@ struct statx {
__u64 stx_ino; /* Inode number */
__u64 stx_size; /* File size */
__u64 stx_blocks; /* Number of 512-byte blocks allocated */
__u64 __spare1[1];
__u64 stx_attributes_mask; /* Mask to show what's supported in stx_attributes */
/* 0x40 */
struct statx_timestamp stx_atime; /* Last access time */
struct statx_timestamp stx_btime; /* File creation time */
@ -155,7 +155,7 @@ struct statx {
#define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */
/*
* Attributes to be found in stx_attributes
* Attributes to be found in stx_attributes and masked in stx_attributes_mask.
*
* These give information about the features or the state of a file that might
* be of use to ordinary userspace programs such as GUIs or ls rather than

12
samples/statx/test-statx.c
View file

@ -141,8 +141,8 @@ static void dump_statx(struct statx *stx)
if (stx->stx_mask & STATX_BTIME)
print_time(" Birth: ", &stx->stx_btime);
if (stx->stx_attributes) {
unsigned char bits;
if (stx->stx_attributes_mask) {
unsigned char bits, mbits;
int loop, byte;
static char attr_representation[64 + 1] =
@ -160,14 +160,18 @@ static void dump_statx(struct statx *stx)
printf("Attributes: %016llx (", stx->stx_attributes);
for (byte = 64 - 8; byte >= 0; byte -= 8) {
bits = stx->stx_attributes >> byte;
mbits = stx->stx_attributes_mask >> byte;
for (loop = 7; loop >= 0; loop--) {
int bit = byte + loop;
if (bits & 0x80)
if (!(mbits & 0x80))
putchar('.'); /* Not supported */
else if (bits & 0x80)
putchar(attr_representation[63 - bit]);
else
putchar('-');
putchar('-'); /* Not set */
bits <<= 1;
mbits <<= 1;
}
if (byte)
putchar(' ');