How does udev get devlink information for kernel device events?

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I understand how the devlinks are created for linux devices by udev via udev rules. The one piece I don't understand is when the kernal emits an event that a particular device went down, how does udev apply the additional information to the event before sending out the udev event (ie the devlinks information)? Does it keep a database of this information somewhere? I have a situation where we have external enclosures containing scsi devices goes down, and a subset of the remove events is missing the devlinks information in the udev event even though the devlink was in place before they went down.










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    I understand how the devlinks are created for linux devices by udev via udev rules. The one piece I don't understand is when the kernal emits an event that a particular device went down, how does udev apply the additional information to the event before sending out the udev event (ie the devlinks information)? Does it keep a database of this information somewhere? I have a situation where we have external enclosures containing scsi devices goes down, and a subset of the remove events is missing the devlinks information in the udev event even though the devlink was in place before they went down.










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      up vote
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      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I understand how the devlinks are created for linux devices by udev via udev rules. The one piece I don't understand is when the kernal emits an event that a particular device went down, how does udev apply the additional information to the event before sending out the udev event (ie the devlinks information)? Does it keep a database of this information somewhere? I have a situation where we have external enclosures containing scsi devices goes down, and a subset of the remove events is missing the devlinks information in the udev event even though the devlink was in place before they went down.










      share|improve this question













      I understand how the devlinks are created for linux devices by udev via udev rules. The one piece I don't understand is when the kernal emits an event that a particular device went down, how does udev apply the additional information to the event before sending out the udev event (ie the devlinks information)? Does it keep a database of this information somewhere? I have a situation where we have external enclosures containing scsi devices goes down, and a subset of the remove events is missing the devlinks information in the udev event even though the devlink was in place before they went down.







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      asked Nov 30 at 21:22









      bieno002

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