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In kernfs_dop_revalidate() when the passed in dentry is negative the dentry directory is checked to see if it has changed and if so the negative dentry is discarded so it can refreshed. During this check the dentry inode i_lock is taken to mitigate against a possible concurrent rename. But if it's racing with a rename, becuase the dentry is negative, it can't be the source it must be the target and it must be going to do a d_move() otherwise the rename will return an error. In this case the parent dentry of the target will not change, it will be the same over the d_move(), only the source dentry parent may change so the inode i_lock isn't needed. Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Ian Kent <raven@themaw.net> Link: https://lore.kernel.org/r/166606036967.13363.9336408133975631967.stgit@donald.themaw.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| dir.c | ||
| file.c | ||
| inode.c | ||
| Kconfig | ||
| kernfs-internal.h | ||
| Makefile | ||
| mount.c | ||
| symlink.c | ||