linux.git/fs/sysv, branch master

sysv: Remove the filesystem

2025-02-21T09:32:47+00:00

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 to use the new mount api

2025-02-06T14:26:12+00:00

Convert the sysv filesystem to use the new mount API.

Tested by mounting some old sysv & v7 images I found in archives;
there are no mount options, and no remount op, so this conversion
is trivial.

Signed-off-by: Eric Sandeen 
Link: https://lore.kernel.org/r/be08b1c1-c6d7-4e82-b457-87116879bdac@redhat.com
Signed-off-by: Christian Brauner

buffer: Convert __block_write_begin() to take a folio

2024-08-07T09:33:36+00:00

Almost all callers have a folio now, so change __block_write_begin()
to take a folio and remove a call to compound_head().

Reviewed-by: Josef Bacik 
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Christian Brauner

fs: Convert aops->write_begin to take a folio

2024-08-07T09:33:21+00:00

Convert all callers from working on a page to working on one page
of a folio (support for working on an entire folio can come later).
Removes a lot of folio->page->folio conversions.

Reviewed-by: Josef Bacik 
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Christian Brauner

buffer: Convert block_write_end() to take a folio

2024-08-07T09:31:59+00:00

All callers now have a folio, so pass it in instead of converting
from a folio to a page and back to a folio again.  Saves a call
to compound_head().

Reviewed-by: Josef Bacik 
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Christian Brauner

sysv: Convert dir_commit_chunk() to take a folio

2024-08-07T09:31:54+00:00

All callers now have a folio, so pass it in.  Saves a call to
compound_head().

Reviewed-by: Josef Bacik 
Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Christian Brauner

sysv: Convert sysv_prepare_chunk() to take a folio

2024-08-07T09:31:54+00:00

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_make_empty() to use a folio

2024-08-07T09:31:54+00:00

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_delete_entry() to work on a folio

2024-08-07T09:31:54+00:00

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

2024-08-07T09:31:53+00:00

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