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| author | David Woodhouse <dwmw2@infradead.org> | 2005-04-13 14:22:38 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-05-23 13:17:49 +0200 |
| commit | 7d200960d4f3d1b50c3b9e9688408d9f81c66ff4 (patch) | |
| tree | 0faf7439968a955f55871048448abb36fa44c090 /fs/jffs2/README.Locking | |
| parent | 0a18cde60f384d1f7aa012aba004766fb633a31d (diff) | |
| download | lwn-7d200960d4f3d1b50c3b9e9688408d9f81c66ff4.tar.gz lwn-7d200960d4f3d1b50c3b9e9688408d9f81c66ff4.zip | |
[JFFS2] Fix inode allocation race
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/jffs2/README.Locking')
| -rw-r--r-- | fs/jffs2/README.Locking | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/jffs2/README.Locking b/fs/jffs2/README.Locking index 49771cf8513a..b7943439b6ec 100644 --- a/fs/jffs2/README.Locking +++ b/fs/jffs2/README.Locking @@ -1,4 +1,4 @@ - $Id: README.Locking,v 1.9 2004/11/20 10:35:40 dwmw2 Exp $ + $Id: README.Locking,v 1.12 2005/04/13 13:22:35 dwmw2 Exp $ JFFS2 LOCKING DOCUMENTATION --------------------------- @@ -108,6 +108,10 @@ in-core jffs2_inode_cache objects (each inode in JFFS2 has the correspondent jffs2_inode_cache object). So, the inocache_lock has to be locked while walking the c->inocache_list hash buckets. +This spinlock also covers allocation of new inode numbers, which is +currently just '++->highest_ino++', but might one day get more complicated +if we need to deal with wrapping after 4 milliard inode numbers are used. + Note, the f->sem guarantees that the correspondent jffs2_inode_cache will not be removed. So, it is allowed to access it without locking the inocache_lock spinlock. |