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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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include/linux/stat.h
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@@ -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 | \