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fs: Add freezing handling to mnt_want_write() / mnt_drop_write()

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Most of places where we want freeze protection coincides with the places where
we also have remount-ro protection. So make mnt_want_write() and
mnt_drop_write() (and their _file alternative) prevent freezing as well.
For the few cases that are really interested only in remount-ro protection
provide new function variants.

BugLink: https://bugs.launchpad.net/bugs/897421
Tested-by: Kamal Mostafa <kamal@canonical.com>
Tested-by: Peter M. Petrakis <peter.petrakis@canonical.com>
Tested-by: Dann Frazier <dann.frazier@canonical.com>
Tested-by: Massimo Morana <massimo.morana@canonical.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara
2012-06-12 16:20:35 +02:00
committed by Al Viro
parent 5accdf82ba
commit eb04c28288
5 changed files with 86 additions and 25 deletions
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fs/file_table.c
+1 -1
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@@ -217,7 +217,7 @@ static void drop_file_write_access(struct file *file)
return;
if (file_check_writeable(file) != 0)
return;
mnt_drop_write(mnt);
__mnt_drop_write(mnt);
file_release_write(file);
}