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authorDave Hansen <haveblue@us.ibm.com>2008-02-15 14:37:48 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 00:29:25 -0400
commit4a3fd211ccfc08a88edc824300e25a87785c6a5f (patch)
tree99f1a76a99fa78464b8de731f7fdb5bcc9667a5e /lib/ts_kmp.c
parent42a74f206b914db13ee1f5ae932dcd91a77c8579 (diff)
[PATCH] r/o bind mounts: elevate write count for open()s
This is the first really tricky patch in the series. It elevates the writer count on a mount each time a non-special file is opened for write. We used to do this in may_open(), but Miklos pointed out that __dentry_open() is used as well to create filps. This will cover even those cases, while a call in may_open() would not have. There is also an elevated count around the vfs_create() call in open_namei(). See the comments for more details, but we need this to fix a 'create, remount, fail r/w open()' race. Some filesystems forego the use of normal vfs calls to create struct files. Make sure that these users elevate the mnt writer count because they will get __fput(), and we need to make sure they're balanced. Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'lib/ts_kmp.c')
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