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-rw-r--r--community/gsoc/project_ideas/mtab.mdwn93
1 files changed, 90 insertions, 3 deletions
diff --git a/community/gsoc/project_ideas/mtab.mdwn b/community/gsoc/project_ideas/mtab.mdwn
index a60a8038..694effca 100644
--- a/community/gsoc/project_ideas/mtab.mdwn
+++ b/community/gsoc/project_ideas/mtab.mdwn
@@ -1,12 +1,13 @@
-[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]
+[[!meta copyright="Copyright © 2008, 2009, 2013 Free Software Foundation,
+Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled
-[[GNU Free Documentation License|/fdl]]."]]"""]]
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
[[!meta title="mtab"]]
@@ -72,3 +73,89 @@ Possible mentors: Olaf Buddenhagen (antrik), Carl Fredrik Hammar (cfhammar)
Exercise: Make some improvement to any of the existing Hurd translators.
Especially those in [hurdextras](http://www.nongnu.org/hurdextras/) are often
quite rudimentary, and it shouldn't be hard to find something to improve.
+
+
+# Related Discussion
+
+## IRC, freenode, #hurd, 2013-04-17
+
+ <kuldeepdhaka> thinking how to get the listing. traversing would be
+ ineffecient, trying to come up with something better
+ <braunr> what listing ?
+ <braunr> and traversing what ?
+ <kuldeepdhaka> mtab
+ <braunr> well i assumed so
+ <braunr> be more precise please
+ <kuldeepdhaka> when the translator is done initalized <translation
+ info> are written to /etc/mtab <translation info> will be provided
+ by the translator, and when some one want to read the info just read it
+ this way if their is some credentials like ftp sites pass username can be
+ masked by the translator
+ <kuldeepdhaka> if some trans dont want to list them, no need to write to
+ file | while unmounting (sorry i couldnt find the right word) , it
+ will pass the mount node address | <translation info> will have special
+ structure to remove/add mounts example "a /mount-to /mount-from" = add
+ , "r /mount-to" = remove here "/mount-to" will be unique for every
+ mount
+ <kuldeepdhaka> this have a draw back , we would have to trust trans for the
+ listed data | also "/mount-to" + "/mount-from" could be used a
+ combination for making sure that other trans unable remove others trans
+ mount data
+ <kuldeepdhaka> sorry but "also "/mount-to" + "/mount-from" could be used a
+ combination for making sure that other trans unable remove others trans
+ mount data" this is a bad idea if we had to print the whole thing
+ <kuldeepdhaka> braunr, whats ur opinion?
+ <pinotree> you don't need a mtab to "unmount" things on hurd
+ <braunr> kuldeepdhaka: hum, have you read the project idea ?
+ <braunr>
+ http://darnassus.sceen.net/~hurd-web/community/gsoc/project_ideas/mtab/
+ <braunr> A more promising approach is to have mtab exported by a special
+ translator, which gathers the necessary information on demand. This could
+ work by traversing the tree of translators, asking each one for mount
+ points attached to it.
+ <kuldeepdhaka> pinotree, not to unmount, i mean is to remove the
+ <translation data>
+ <braunr> for a first implementation, i'd suggest a recursive traversal of
+ root-owned translators
+ <kuldeepdhaka> braunr, hum, but it did stated it as inefficient
+ <braunr> where ?
+ <kuldeepdhaka> para 5 , line 3
+ <kuldeepdhaka> and line 6
+ <braunr> no
+ <braunr> traversing "all" nodes would be inefficient
+ <braunr> translators which host the nodes of other translators could
+ maintain a simple list of active translators
+ <braunr> ext2fs, e.g. (if that's not already the case) could keep the list
+ of the translators it started
+ <braunr> we can already see that list with pstree for example
+ <braunr> but this new list would only retain those relevant for mtab
+ <braunr> i.e. root-owned ones
+ <pinotree> i would not limit to those though
+ <braunr> and then filter on their type (e.g. file system ones)
+ <braunr> pinotree: why ?
+ <pinotree> this way you could have proper per-user /proc/$pid/mounts info
+ <braunr> we could also very easily have a denial of service
+ <kuldeepdhaka> but how will the mount point and source point will be
+ listed?
+ <braunr> they're returned by the translator
+ <kuldeepdhaka> k
+ <braunr> you ask /, it returns its store and its options, and asks its
+ children recursively
+ <braunr> a /home translator would return its store and its options
+ <braunr> etc..
+ <braunr> each translator would build the complete path before returning it
+ <braunr> sort of, it's very basic
+ <braunr> but that would be a very hurdish way to do it
+ <kuldeepdhaka> shall /etc/mtab should be made seek-able and what should be
+ the filesize? content are generated on demand so, it could arise problem
+ (fsize:0 , seek-able:no), ur opinions?
+ <braunr> kuldeepdhaka: it should have all the properties of a regular file
+ <braunr> the filesize would be determined after it's generated
+ <braunr> being empty doesn't imply it's not seekable
+ <kuldeepdhaka> content is generated on demand so, could cause problem while
+ seeking and filesize, shall i still program as regular file?
+ <kuldeepdhaka> in two different read, it could generate different content,
+ though same seek pos is used...
+ <braunr> what ?
+ <braunr> the content is generated on open
+ <kuldeepdhaka> ooh, ok