Difference between revisions of "File locks"
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| − | Some app may use file locks for synchronization. Generally they will use flock or POSIX file locks, which were achieved by <code>flock</code> or <code>fcntl</code> system calls. For dump/restore, it is hard to be handled perfectly, because we can't guarantee all potential users are dumped for a specific file lock. Right now, we assume that all file lock users are taken into dump, and the | + | Some app may use file locks for synchronization. Generally they will use flock or POSIX file locks, which were achieved by <code>flock</code> or <code>fcntl</code> system calls. For dump/restore, it is hard to be handled perfectly, because we can't guarantee all potential users are dumped for a specific file lock. Right now, we assume that all file lock users are taken into dump, and the {{Opt|--file-locks}} option should be used on both dump and restore stages if our app may use any file locks. Remember that file locks dump/restore can only be absolutely safe for container dumping (as a container, naturally, contains all the file locks users). |
Currently supported lock types are: | Currently supported lock types are: | ||
Latest revision as of 10:43, 22 February 2017
Some app may use file locks for synchronization. Generally they will use flock or POSIX file locks, which were achieved by flock or fcntl system calls. For dump/restore, it is hard to be handled perfectly, because we can't guarantee all potential users are dumped for a specific file lock. Right now, we assume that all file lock users are taken into dump, and the --file-locks option should be used on both dump and restore stages if our app may use any file locks. Remember that file locks dump/restore can only be absolutely safe for container dumping (as a container, naturally, contains all the file locks users).
Currently supported lock types are:
flock()locks- POSIX (
fcntl) locks
In future releases, we plan to also support:
- file leases
- OFD locks
- mandatory locks