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authorAnton Altaparmakov <aia21@cam.ac.uk>2007-10-12 09:37:15 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-12 09:16:30 -0700
commitbfab36e81611e60573b84eb4e4b4c8d8545b2320 (patch)
treeacd151a4c85459dcd2f6575ceb385090ebaaf984 /Documentation
parentf26e51f67ae6a75ffc57b96cf5fe096f75e778cb (diff)
downloadlinux-bfab36e81611e60573b84eb4e4b4c8d8545b2320.tar.bz2
NTFS: Fix a mount time deadlock.
Big thanks go to Mathias Kolehmainen for reporting the bug, providing debug output and testing the patches I sent him to get it working. The fix was to stop calling ntfs_attr_set() at mount time as that causes balance_dirty_pages_ratelimited() to be called which on systems with little memory actually tries to go and balance the dirty pages which tries to take the s_umount semaphore but because we are still in fill_super() across which the VFS holds s_umount for writing this results in a deadlock. We now do the dirty work by hand by submitting individual buffers. This has the annoying "feature" that mounting can take a few seconds if the journal is large as we have clear it all. One day someone should improve on this by deferring the journal clearing to a helper kernel thread so it can be done in the background but I don't have time for this at the moment and the current solution works fine so I am leaving it like this for now. Signed-off-by: Anton Altaparmakov <aia21@cantab.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/ntfs.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/filesystems/ntfs.txt b/Documentation/filesystems/ntfs.txt
index 8ee10ec88293..e79ee2db183a 100644
--- a/Documentation/filesystems/ntfs.txt
+++ b/Documentation/filesystems/ntfs.txt
@@ -407,7 +407,7 @@ raiddev /dev/md0
device /dev/hda5
raid-disk 0
device /dev/hdb1
- raid-disl 1
+ raid-disk 1
For linear raid, just change the raid-level above to "raid-level linear", for
mirrors, change it to "raid-level 1", and for stripe sets with parity, change
@@ -457,6 +457,8 @@ ChangeLog
Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
+2.1.29:
+ - Fix a deadlock when mounting read-write.
2.1.28:
- Fix a deadlock.
2.1.27: