From: Darrick J. Wong Date: Mon, 15 Apr 2024 21:54:42 +0000 (-0700) Subject: xfs: enable discarding of folios backing an xfile X-Git-Tag: v6.10-rc1~87^2~67^2~6 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=98339edf0750e75e216521961c98c8105a830bf8;p=thirdparty%2Fkernel%2Flinux.git xfs: enable discarding of folios backing an xfile Create a new xfile function to discard the page cache that's backing part of an xfile. The next patch wil use this to drop parts of an xfile that aren't needed anymore. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h index 8d05f2adae3dd..7d07912d8f758 100644 --- a/fs/xfs/scrub/trace.h +++ b/fs/xfs/scrub/trace.h @@ -948,6 +948,7 @@ DEFINE_XFILE_EVENT(xfile_store); DEFINE_XFILE_EVENT(xfile_seek_data); DEFINE_XFILE_EVENT(xfile_get_folio); DEFINE_XFILE_EVENT(xfile_put_folio); +DEFINE_XFILE_EVENT(xfile_discard); TRACE_EVENT(xfarray_create, TP_PROTO(struct xfarray *xfa, unsigned long long required_capacity), diff --git a/fs/xfs/scrub/xfile.c b/fs/xfs/scrub/xfile.c index 8cdd863db5850..4e254a0ba0036 100644 --- a/fs/xfs/scrub/xfile.c +++ b/fs/xfs/scrub/xfile.c @@ -310,3 +310,15 @@ xfile_put_folio( folio_unlock(folio); folio_put(folio); } + +/* Discard the page cache that's backing a range of the xfile. */ +void +xfile_discard( + struct xfile *xf, + loff_t pos, + u64 count) +{ + trace_xfile_discard(xf, pos, count); + + shmem_truncate_range(file_inode(xf->file), pos, pos + count - 1); +} diff --git a/fs/xfs/scrub/xfile.h b/fs/xfs/scrub/xfile.h index 76d78dba7e347..8dfbae1fe33a5 100644 --- a/fs/xfs/scrub/xfile.h +++ b/fs/xfs/scrub/xfile.h @@ -17,6 +17,7 @@ int xfile_load(struct xfile *xf, void *buf, size_t count, loff_t pos); int xfile_store(struct xfile *xf, const void *buf, size_t count, loff_t pos); +void xfile_discard(struct xfile *xf, loff_t pos, u64 count); loff_t xfile_seek_data(struct xfile *xf, loff_t pos); #define XFILE_MAX_FOLIO_SIZE (PAGE_SIZE << MAX_PAGECACHE_ORDER)