always update file mode when updating file content?

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Hello,

It seems that whenever we write to a file (to update its content), the
file mode is always updated. Specifically I observe that function (LSM
hook) below:

security_inode_setattr(struct dentry *dentry, struct iattr *attr)

is always called twice:
- 1st time is with attr->ia_valid == ATTR_MODE|ATTR_CTIME
- 2nd time is with attr->ia_valid == ATTR_SIZE|ATTR_CTIME

I wonder why the file mode is always updated? Anybody could please
clarify on this matter?

The linux kernel I am working on is 2.6.12.4

Many thanks, and happy new year 2006 to everybody :-)

Hieu

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