Maxim Sobolev
2aca5deff7
On a soft updates file system, keep a directory at UFS_LINK_MAX with workers removing and recreating subdirectories in it, so that mkdir(2) keeps going through ufs_sync_nlink(), and force-unmount, check and remount the file system in a loop. The workers work relative to the directory: a lookup through the mount point would wait for the unmount on the covered vnode lock and never race with it. Before the fix, the first forced unmount deadlocked with mkdir(2) sleeping in vfs_busy(). With dtrace=1, count the vfs_busy() calls made during an unmount by caller, and the mkdir(2) calls that synced and restarted with ERELOOKUP during an unmount, which shows that the race was hit. Sponsored by: Sippy Software, Inc. Reviewed by: pho Tested by: pho Differential Revision: https://reviews.freebsd.org/D60204 MFC after: 1 month
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| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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