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path: root/fs/ubifs/tnc.c
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2008-09-30UBIFS: correct condition to eliminate unecessary assignmentAdrian Hunter
Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-09-30UBIFS: improve znode splitting rulesAdrian Hunter
When inserting into a full znode it is split into two znodes. Because data node keys are usually consecutive, it is better to try to keep them together. This patch does a better job of that. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-09-30UBIFS: add no_chk_data_crc mount optionAdrian Hunter
UBIFS read performance can be improved by skipping the CRC check when data nodes are read. This option can be used if the underlying media is considered to be highly reliable. Note that CRCs are always checked for metadata. Read speed on Arm platform with OneNAND goes from 19 MiB/s to 27 MiB/s with data CRC checking disabled. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-09-30UBIFS: add bulk-read facilityAdrian Hunter
Some flash media are capable of reading sequentially at faster rates. UBIFS bulk-read facility is designed to take advantage of that, by reading in one go consecutive data nodes that are also located consecutively in the same LEB. Read speed on Arm platform with OneNAND goes from 17 MiB/s to 19 MiB/s. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-09-30UBIFS: remove unneeded unlikely()Hirofumi Nakagawa
IS_ERR() macro already has unlikely(), so do not use constructions like 'if (unlikely(IS_ERR())'. Signed-off-by: Hirofumi Nakagawa <hnakagawa@miraclelinux.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2008-09-17UBIFS: TNC / GC race fixesAdrian Hunter
- update GC sequence number if any nodes may have been moved even if GC did not finish the LEB - don't ignore error return when reading Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2008-08-25UBIFS: allow for racing between GC and TNCAdrian Hunter
The TNC mutex is unlocked prematurely when reading leaf nodes with non-hashed keys. This is unsafe because the node may be moved by garbage collection and the eraseblock unmapped, although that has never actually happened during stress testing. This patch fixes the flaw by detecting the race and retrying with the TNC mutex locked. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-08-25UBIFS: always read hashed-key nodes under TNC mutexAdrian Hunter
Leaf-nodes that have a hashed key are stored in the leaf-node-cache (LNC) which is protected by the TNC mutex. Consequently, when reading a leaf node with a hashed key (i.e. directory entries, xattr entries) the TNC mutex is always required. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
2008-07-15UBIFS: add new flash file systemArtem Bityutskiy
This is a new flash file system. See http://www.linux-mtd.infradead.org/doc/ubifs.html Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>