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Diffstat (limited to 'fs/stat.c')
-rw-r--r--fs/stat.c48
1 files changed, 41 insertions, 7 deletions
diff --git a/fs/stat.c b/fs/stat.c
index 6f65b3456cad..89ce1be56310 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -90,6 +90,37 @@ void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
EXPORT_SYMBOL(generic_fill_statx_attr);
/**
+ * generic_fill_statx_atomic_writes - Fill in atomic writes statx attributes
+ * @stat: Where to fill in the attribute flags
+ * @unit_min: Minimum supported atomic write length in bytes
+ * @unit_max: Maximum supported atomic write length in bytes
+ *
+ * Fill in the STATX{_ATTR}_WRITE_ATOMIC flags in the kstat structure from
+ * atomic write unit_min and unit_max values.
+ */
+void generic_fill_statx_atomic_writes(struct kstat *stat,
+ unsigned int unit_min,
+ unsigned int unit_max)
+{
+ /* Confirm that the request type is known */
+ stat->result_mask |= STATX_WRITE_ATOMIC;
+
+ /* Confirm that the file attribute type is known */
+ stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC;
+
+ if (unit_min) {
+ stat->atomic_write_unit_min = unit_min;
+ stat->atomic_write_unit_max = unit_max;
+ /* Initially only allow 1x segment */
+ stat->atomic_write_segments_max = 1;
+
+ /* Confirm atomic writes are actually supported */
+ stat->attributes |= STATX_ATTR_WRITE_ATOMIC;
+ }
+}
+EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_writes);
+
+/**
* vfs_getattr_nosec - getattr without security checks
* @path: file to get attributes from
* @stat: structure to return attributes in
@@ -231,13 +262,13 @@ static int vfs_statx_path(struct path *path, int flags, struct kstat *stat,
stat->attributes |= STATX_ATTR_MOUNT_ROOT;
stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
- /* Handle STATX_DIOALIGN for block devices. */
- if (request_mask & STATX_DIOALIGN) {
- struct inode *inode = d_backing_inode(path->dentry);
-
- if (S_ISBLK(inode->i_mode))
- bdev_statx_dioalign(inode, stat);
- }
+ /*
+ * If this is a block device inode, override the filesystem
+ * attributes with the block device specific parameters that need to be
+ * obtained from the bdev backing inode.
+ */
+ if (S_ISBLK(stat->mode))
+ bdev_statx(path, stat, request_mask);
return error;
}
@@ -670,6 +701,9 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
tmp.stx_dio_mem_align = stat->dio_mem_align;
tmp.stx_dio_offset_align = stat->dio_offset_align;
tmp.stx_subvol = stat->subvol;
+ tmp.stx_atomic_write_unit_min = stat->atomic_write_unit_min;
+ tmp.stx_atomic_write_unit_max = stat->atomic_write_unit_max;
+ tmp.stx_atomic_write_segments_max = stat->atomic_write_segments_max;
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}