kernel/fs/autofs/root.c, branch linux-5.1.y

autofs: add strictexpire mount option

2019-01-04T21:13:47Z

Commit 092a53452bb7 ("autofs: take more care to not update last_used on path walk") helped to (partially) resolve a problem where automounts were not expiring due to aggressive accesses from user space. This patch was later reverted because, for very large environments, it meant more mount requests from clients and when there are a lot of clients this caused a fairly significant increase in server load. But there is a need for both types of expire check, depending on use case, so add a mount option to allow for strict update of last use of autofs dentrys (which just means not updating the last use on path walk access). Link: http://lkml.kernel.org/r/154296973880.9889.14085372741514507967.stgit@pluto-themaw-net Signed-off-by: Ian Kent Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs: change catatonic setting to a bit flag

2019-01-04T21:13:47Z

Change the superblock info. catatonic setting to be part of a flags bit field. Link: http://lkml.kernel.org/r/154296973142.9889.17275721668508589639.stgit@pluto-themaw-net Signed-off-by: Ian Kent Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs: fix directory and symlink access

2018-08-22T17:52:49Z

Depending on how it is configured the autofs user space daemon can leave in use mounts mounted at exit and re-connect to them at start up. But for this to work best the state of the autofs file system needs to be left intact over the restart. Also, at system shutdown, mounts in an autofs file system might be umounted exposing a mount point trigger for which subsequent access can lead to a hang. So recent versions of automount(8) now does its best to set autofs file system mounts catatonic at shutdown. When autofs file system mounts are catatonic it's currently possible to create and remove directories and symlinks which can be a problem at restart, as described above. So return EACCES in the directory, symlink and unlink methods if the autofs file system is catatonic. Link: http://lkml.kernel.org/r/152902119090.4144.9561910674530214291.stgit@pluto.themaw.net Signed-off-by: Ian Kent Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs: clean up includes

2018-06-08T00:34:40Z

Remove includes that aren't needed from autofs (and fs/compat_ioctl.c). Link: http://lkml.kernel.org/r/152635085258.5968.9743527195522188148.stgit@pluto.themaw.net Signed-off-by: Ian Kent Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs: copy autofs4 to autofs

2018-06-08T00:34:39Z

Copy source files from the autofs4 directory to the autofs directory. Link: http://lkml.kernel.org/r/152626705013.28589.931913083997578251.stgit@pluto.themaw.net Signed-off-by: Ian Kent Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs3: move to drivers/staging

2010-10-05T16:03:39Z

Nobody appears to be interested in fixing autofs3 bugs any more and it uses the BKL, which is going away. Move this to staging for retirement. Unless someone complains until 2.6.38, we can remove it for good. The include/linux/auto_fs.h header file is still used by autofs4, so it remains in place. Signed-off-by: Arnd Bergmann Cc: Ian Kent Cc: autofs@linux.kernel.org Cc: "H. Peter Anvin" Acked-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman

autofs/autofs4: Move compat_ioctl handling into fs

2010-08-08T22:13:34Z

Handling of autofs ioctl numbers does not need to be generic and can easily be done directly in autofs itself. This also pushes the BKL into autofs and autofs4 ioctl methods. Signed-off-by: Arnd Bergmann Acked-by: H. Peter Anvin Cc: Al Viro Cc: Ian Kent Cc: Autofs Cc: John Kacur Signed-off-by: Frederic Weisbecker

fs/: do not fallback to default_llseek() when readdir() uses BKL

2010-05-27T16:12:56Z

Do not use the fallback default_llseek() if the readdir operation of the filesystem still uses the big kernel lock. Since llseek() modifies file->f_pos of the directory directly it may need locking to not confuse readdir which usually uses file->f_pos directly as well Since the special characteristics of the BKL (unlocked on schedule) are not necessary in this case, the inode mutex can be used for locking as provided by generic_file_llseek(). This is only possible since all filesystems, except reiserfs, either use a directory as a flat file or with disk address offsets. Reiserfs on the other hand uses a 32bit hash off the filename as the offset so generic_file_llseek() can get used as well since the hash is always smaller than sb->s_maxbytes (= (512 << 32) - blocksize). Signed-off-by: Jan Blunck Acked-by: Jan Kara Acked-by: Anders Larsen Cc: Frederic Weisbecker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30T13:02:32Z

percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo Guess-its-ok-by: Christoph Lameter Cc: Ingo Molnar Cc: Lee Schermerhorn

constify dentry_operations: autofs, autofs4

2009-03-27T18:44:00Z

Signed-off-by: Al Viro