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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-03 21:35:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-03 21:35:20 +0300
commita782e866497217f22c5d9014cbb7be8549151376 (patch)
treef1fd2e196c53618e2485d7bc04b654158fefa21f /Documentation/filesystems
parentd9395512c5bd326924ba0b36ee0d5d51d763a8d6 (diff)
parent868941b14441282ba08761b770fc6cad69d5bdb7 (diff)
downloadlinux-a782e866497217f22c5d9014cbb7be8549151376.tar.xz
Merge tag 'pull-work.lseek' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs lseek updates from Al Viro: "Jason's lseek series. Saner handling of 'lseek should fail with ESPIPE' - this gets rid of the magical no_llseek thing and makes checks consistent. In particular, the ad-hoc "can we do splice via internal pipe" checks got saner (and somewhat more permissive, which is what Jason had been after, AFAICT)" * tag 'pull-work.lseek' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: remove no_llseek fs: check FMODE_LSEEK to control internal pipe splicing vfio: do not set FMODE_LSEEK flag dma-buf: remove useless FMODE_LSEEK flag fs: do not compare against ->llseek fs: clear or set FMODE_LSEEK based on llseek function
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/porting.rst8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index 2e0e4f0e0c6f..aee9aaf9f3df 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -914,3 +914,11 @@ Calling conventions for file_open_root() changed; now it takes struct path *
instead of passing mount and dentry separately. For callers that used to
pass <mnt, mnt->mnt_root> pair (i.e. the root of given mount), a new helper
is provided - file_open_root_mnt(). In-tree users adjusted.
+
+---
+
+**mandatory**
+
+no_llseek is gone; don't set .llseek to that - just leave it NULL instead.
+Checks for "does that file have llseek(2), or should it fail with ESPIPE"
+should be done by looking at FMODE_LSEEK in file->f_mode.