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smb client fixes for v7.3-rc6

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- Stop data dirtied past EOF through an mmap from reappearing as file
    content once the file is extended by a write, truncate, zero range,
    copy range or clone range
 
  - Flush dirty data and drain in-flight I/O before operations that
    assume the pagecache and the server agree on the file: querying
    allocated ranges, the O_TRUNC open, interior zero range, and
    server-side copy/clone
 
  - Stop a genuine size-extending zero range or preallocate from being
    refused with -EOPNOTSUPP when the inode is not read caching, by
    querying the server's authoritative EOF instead of trusting a stale
    cached i_size
 
  - Zero the untransferred tail of a short read, both in the netfs
    read-gaps path (where stale folio content could otherwise be written
    back to the server) and in the DIO/unbuffered read collector, and
    tell a real EOF apart from a stale cached remote_i_size after a lease
    downgrade
 
  - Require stable pages on signed connections so a buffered write can't
    modify a folio whose signature has already been computed and is in
    flight, which the server rejected with STATUS_ACCESS_DENIED and the
    client surfaced as -EIO
 
  - Split several cifsFileInfo flags out of a shared bitfield byte so
    concurrent updates taken under different locks no longer clobber each
    other through a byte-level RMW
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Merge tag 'cifs-fixes-7.3-rc6' of https://git.manguebit.org/linux

Pull smb client fixes from Paulo Alcantara:
 "Fix a series of data corruption and I/O error bugs found by running
  generic/363 (fsx) in a loop against Windows Server 2022 and Samba.

   - Stop data dirtied past EOF through an mmap from reappearing as file
     content once the file is extended by a write, truncate, zero range,
     copy range or clone range

   - Flush dirty data and drain in-flight I/O before operations that
     assume the pagecache and the server agree on the file: querying
     allocated ranges, the O_TRUNC open, interior zero range, and
     server-side copy/clone

   - Stop a genuine size-extending zero range or preallocate from being
     refused with -EOPNOTSUPP when the inode is not read caching, by
     querying the server's authoritative EOF instead of trusting a stale
     cached i_size

   - Zero the untransferred tail of a short read, both in the netfs
     read-gaps path (where stale folio content could otherwise be
     written back to the server) and in the DIO/unbuffered read
     collector, and tell a real EOF apart from a stale cached
     remote_i_size after a lease downgrade

   - Require stable pages on signed connections so a buffered write
     can't modify a folio whose signature has already been computed and
     is in flight, which the server rejected with STATUS_ACCESS_DENIED
     and the client surfaced as -EIO

   - Split several cifsFileInfo flags out of a shared bitfield byte so
     concurrent updates taken under different locks no longer clobber
     each other through a byte-level RMW"

* tag 'cifs-fixes-7.3-rc6' of https://git.manguebit.org/linux:
  smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
  smb: client: require stable pages for signed connections
  smb: client: distinguish real EOF from a stale remote_i_size on read
  netfs: zero the tail of a short DIO/unbuffered read
  smb: client: only require read lease for size-extending preallocate
  netfs: zero gaps in read-gaps folio to avoid writing back stale data
  smb: client: only require read lease for size-extending zero range
  smb: client: drain and invalidate before server-side copy/clone
  smb: client: flush dirty data before zeroing a range
  smb: client: drain outstanding I/O before truncating on O_TRUNC open
  smb: client: flush and commit data before querying allocated ranges
  smb: client: discard post-EOF pagecache when extending a file via clone range
  smb: client: discard post-EOF pagecache when extending a file via copy range
  smb: client: discard post-EOF pagecache when extending a file via zero range
  smb: client: clear post-EOF pagecache when extending a file via truncate
  netfs: clear post-EOF pagecache when extending a file via write
This commit is contained in:
Linus Torvalds 2026-10-02 14:04:11 -07:00
commit ff47652a4b
15 changed files with 347 additions and 56 deletions
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