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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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1
fs/stat.c
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@ -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;