I want to create a tempfs for specific photo-gallery app which supposed to have very high performance. More specificely, I have a code that creates a tmpfs, and I want a 3rd party photo-gallery app to access files in that tmpfs.
I created a tempfs and mounted it to some node in the filesystem. Then I copied the specific list of photos from the sdcard into my tmpfs ordinarily. (Remember that the filesystem on the sd-card is VFAT)
The files are well copied to the tmpfs destination but I got a very anoying problem: it seems that there is no option of setting the umask attribute to the tmpfs (also, you can see that this attribute gets 0 in the fstab file) and thus, all the files that I copy from sdcard to the tmpfs are getting no permissions, i.e., my app cannot read/write them (but they're exist).
How can I solve it?
So edit your fstab and add a different umask. e.g.
mode=644to allow "read/write" access for the user, and only "read" for the user's group and everyone else.