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authorEric W. Biederman <ebiederm@xmission.com>2007-08-20 21:36:30 +0900
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:51:08 -0700
commit932ea2e374dd1ca26676297a5eccd1cdab86f7cd (patch)
tree83bba794de7f1f9f9290192f4f95a8ed9c91dfb6 /fs/seq_file.c
parent89bec09705d2033b8b765f3c3ac5093f80bd5bc4 (diff)
downloadlinux-932ea2e374dd1ca26676297a5eccd1cdab86f7cd.tar.bz2
sysfs: Introduce sysfs_rename_mutex
Looking carefully at the rename code we have a subtle dependency that the structure of sysfs not change while we are performing a rename. If the parent directory of the object we are renaming changes while the rename is being performed nasty things could happen when we go to release our locks. So introduce a sysfs_rename_mutex to prevent this highly unlikely theoretical issue. In addition hold sysfs_rename_mutex over all calls to sysfs_get_dentry. Allowing sysfs_get_dentry to be simplified in the future. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/seq_file.c')
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