From: Zhang Yi yi.zhang@huawei.com
maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9VTE3 CVE: NA
Reference: https://lore.kernel.org/linux-fsdevel/20240529095206.2568162-1-yi.zhang@huaw...
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iomap_truncate_page() always assumes the block size of the truncating inode is i_blocksize(), this is not always true for some filesystems, e.g. XFS does extent size alignment for realtime inodes. Drop this assumption and pass the block size for zeroing into iomap_truncate_page(), allow filesystems to indicate the correct block size.
Suggested-by: Dave Chinner david@fromorbit.com Signed-off-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Long Li leo.lilong@huawei.com --- fs/iomap/buffered-io.c | 8 ++++---- fs/xfs/xfs_iops.c | 5 +++-- include/linux/iomap.h | 4 ++-- 3 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 45471ee7e919..0bb3257cba42 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -17,6 +17,7 @@ #include <linux/bio.h> #include <linux/sched/signal.h> #include <linux/migrate.h> +#include <linux/math64.h> #include "trace.h"
#include "../internal.h" @@ -1044,11 +1045,10 @@ iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero, EXPORT_SYMBOL_GPL(iomap_zero_range);
int -iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, - const struct iomap_ops *ops) +iomap_truncate_page(struct inode *inode, loff_t pos, unsigned int blocksize, + bool *did_zero, const struct iomap_ops *ops) { - unsigned int blocksize = i_blocksize(inode); - unsigned int off = pos & (blocksize - 1); + unsigned int off = rem_u64(pos, blocksize);
/* Block boundary? Nothing to do */ if (!off) diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index a527a544a684..092fb02d1a13 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -769,6 +769,7 @@ xfs_setattr_size( int error; uint lock_flags = 0; bool did_zeroing = false; + unsigned int blocksize = i_blocksize(inode);
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); ASSERT(xfs_isilocked(ip, XFS_MMAPLOCK_EXCL)); @@ -830,8 +831,8 @@ xfs_setattr_size( newsize); if (error) return error; - error = iomap_truncate_page(inode, newsize, &did_zeroing, - &xfs_buffered_write_iomap_ops); + error = iomap_truncate_page(inode, newsize, blocksize, + &did_zeroing, &xfs_buffered_write_iomap_ops); }
if (error) diff --git a/include/linux/iomap.h b/include/linux/iomap.h index d14a729d40ce..1b6e22741d43 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -207,8 +207,8 @@ int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len, const struct iomap_ops *ops); int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero, const struct iomap_ops *ops); -int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, - const struct iomap_ops *ops); +int iomap_truncate_page(struct inode *inode, loff_t pos, unsigned int blocksize, + bool *did_zero, const struct iomap_ops *ops); vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops); int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,