kernel/fs/sysv/sysv.h, branch linux-rolling-stable

sysv: Remove the filesystem

2025-02-21T09:32:47Z

Since 2002 (change "Replace BKL for chain locking with sysvfs-private rwlock") the sysv filesystem was doing IO under a rwlock in its get_block() function (yes, a non-sleepable lock hold over a function used to read inode metadata for all reads and writes). Nobody noticed until syzbot in 2023 [1]. This shows nobody is using the filesystem. Just drop it. [1] https://lore.kernel.org/all/0000000000000ccf9a05ee84f5b0@google.com/ Signed-off-by: Jan Kara Link: https://lore.kernel.org/r/20250220163940.10155-2-jack@suse.cz Reviewed-by: Jeff Layton Reviewed-by: "Darrick J. Wong" Signed-off-by: Christian Brauner

sysv: Convert sysv_prepare_chunk() to take a folio

2024-08-07T09:31:54Z

All callers now have a folio, so convert sysv_prepare_chunk() to take one. Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

sysv: Convert sysv_delete_entry() to work on a folio

2024-08-07T09:31:54Z

Match ext2 and remove a few hidden calls to compound_head(). Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

sysv: Convert sysv_set_link() and sysv_dotdot() to take a folio

2024-08-07T09:31:53Z

This matches ext2 and removes a few hidden calls to compound_head(). Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

sysv: Convert sysv_find_entry() to take a folio

2024-08-07T09:31:53Z

Remove a few hidden calls to compound_head(). Reviewed-by: Josef Bacik Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Christian Brauner

sysv: switch to put_and_unmap_page()

2023-03-13T00:03:41Z

Signed-off-by: Al Viro

Merge branch 'work.sysv' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2023-02-25T03:03:26Z

Pull sysv updates from Al Viro: "Fabio's 'switch to kmap_local_page()' patchset (originally after the ext2 counterpart, with a lot of cleaning up done to it; as the matter of fact, ext2 side is in need of similar cleanups - calling conventions there are bloody awful). Plus the equivalents of minix stuff..." * 'work.sysv' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: sysv: fix handling of delete_entry and set_link failures fs/sysv: Replace kmap() with kmap_local_page() fs/sysv: Use dir_put_page() in sysv_rename() fs/sysv: Change the signature of dir_get_page() fs/sysv: Use the offset_in_page() helper sysv: don't flush page immediately for DIRSYNC directories

sysv: fix handling of delete_entry and set_link failures

2023-01-20T04:24:42Z

similar to minixfs series - make sysv_set_link() report failures, lift dir_put_page() into the callers of sysv_set_link() and sysv_delete_entry(), make sysv_rename() handle failures in both. Signed-off-by: Al Viro

fs/sysv: Replace kmap() with kmap_local_page()

2023-01-20T04:24:35Z

kmap() is being deprecated in favor of kmap_local_page(). There are two main problems with kmap(): (1) It comes with an overhead as the mapping space is restricted and protected by a global lock for synchronization and (2) it also requires global TLB invalidation when the kmap’s pool wraps and it might block when the mapping space is fully utilized until a slot becomes available. With kmap_local_page() the mappings are per thread, CPU local, can take page faults, and can be called from any context (including interrupts). It is faster than kmap() in kernels with HIGHMEM enabled. Furthermore, the tasks can be preempted and, when they are scheduled to run again, the kernel virtual addresses are restored and still valid. Since kmap_local_page() would not break the strict rules of local mappings (i.e., the thread locality and the stack based nesting), this function can be easily and safely replace the deprecated API. Therefore, replace kmap() with kmap_local_page() in fs/sysv. kunmap_local() requires the mapping address, so return that address from dir_get_page() to be used in dir_put_page(). Suggested-by: Al Viro Suggested-by: Ira Weiny Signed-off-by: Fabio M. De Francesco Signed-off-by: Al Viro

fs/sysv: Use dir_put_page() in sysv_rename()

2023-01-20T00:45:43Z

Use the dir_put_page() helper in sysv_rename() instead of open-coding two kunmap() + put_page(). Cc: Al Viro Suggested-by: Ira Weiny Signed-off-by: Fabio M. De Francesco Signed-off-by: Al Viro