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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 <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
David Howells 2017-03-31 18:32:17 +01:00 • committed by Al Viro
commit 3209f68b3c
5 changed files with 18 additions and 6 deletions
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6
fs/ext4/inode.c
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@ -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;
}