Hi Martin, thank you very much for your explanation. +1 Il Ven 17 Lug 2020, 12:14 J Martin Rushton via CentOS <centos at centos.org> ha scritto: > On 17/07/2020 10:30, Alessandro Baggi wrote: > > > > Il 17/07/20 10:54, Karl Vogel ha scritto: > >> It depends on the size of the variables in the structure used by the > >> stat() call. In ext4, the "links" variable is an unsigned 16-bit > >> integer, > >> so you have your limit of 64k or so. I've worked with systems where > >> the limit was a signed 16-bit integer, so it maxed out at 32k. > >> > >> XFS may be a full 32-bit integer, so your test script could be running > >> for quite some time. Or it may just allocate space as it needs. It > >> sounds > >> like you have plenty of room for links, so I wouldn't worry. > >> > >> -- > >> Karl Vogel / vogelke at pobox.com / I don't speak for the USAF or my > company > >> > >> Don't accept your dog's admiration as > >> conclusive evidence that you are wonderful. --Ann Landers > > > > Hi Karl, > > > > thank you for your clarification. I will try to rearch this limit (by > > curiosity) > > > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > https://lists.centos.org/mailman/listinfo/centos > > Have a look at > > https://mirrors.edge.kernel.org/pub/linux/utils/fs/xfs/docs/xfs_filesystem_structure.pdf > > On page 105 the inode structure is given: > > __uint16_t di_onlink; > ... > __uint32_t di_nlink > > Page 107 gives more detail: > > di_onlink: > In v1 inodes, this specifies the number of links to the inode from > directories. When the number exceeds 65535,the inode is converted to v2 > and the link count is stored in di_nlink. > > di_nlink: > Specifies the number of links to the inode from directories. This is > maintained for both inode versions for current versions of XFS. Prior to > v2 inodes, this field was part of di_pad. > > So, the effect is that whatever version you start with, adding more than > 65535 links will force it to version 2 and give you up to 4,294,967,295 > links! > > -- > J Martin Rushton MBCS > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >